Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 1999-2004 Hewlett-Packard Co |
| 3 | * David Mosberger-Tang <davidm@hpl.hp.com> |
| 4 | * Copyright (C) 2003 Fenghua Yu <fenghua.yu@intel.com> |
Simon Arlott | 72fdbdc | 2007-05-11 14:55:43 -0700 | [diff] [blame] | 5 | * - Change pt_regs_off() to make it less dependent on pt_regs structure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | */ |
| 7 | /* |
| 8 | * This file implements call frame unwind support for the Linux |
| 9 | * kernel. Parsing and processing the unwind information is |
| 10 | * time-consuming, so this implementation translates the unwind |
| 11 | * descriptors into unwind scripts. These scripts are very simple |
| 12 | * (basically a sequence of assignments) and efficient to execute. |
| 13 | * They are cached for later re-use. Each script is specific for a |
| 14 | * given instruction pointer address and the set of predicate values |
| 15 | * that the script depends on (most unwind descriptors are |
| 16 | * unconditional and scripts often do not depend on predicates at |
| 17 | * all). This code is based on the unwind conventions described in |
| 18 | * the "IA-64 Software Conventions and Runtime Architecture" manual. |
| 19 | * |
| 20 | * SMP conventions: |
| 21 | * o updates to the global unwind data (in structure "unw") are serialized |
| 22 | * by the unw.lock spinlock |
| 23 | * o each unwind script has its own read-write lock; a thread must acquire |
| 24 | * a read lock before executing a script and must acquire a write lock |
| 25 | * before modifying a script |
| 26 | * o if both the unw.lock spinlock and a script's read-write lock must be |
| 27 | * acquired, then the read-write lock must be acquired first. |
| 28 | */ |
| 29 | #include <linux/module.h> |
| 30 | #include <linux/bootmem.h> |
| 31 | #include <linux/elf.h> |
| 32 | #include <linux/kernel.h> |
| 33 | #include <linux/sched.h> |
| 34 | #include <linux/slab.h> |
| 35 | |
| 36 | #include <asm/unwind.h> |
| 37 | |
| 38 | #include <asm/delay.h> |
| 39 | #include <asm/page.h> |
| 40 | #include <asm/ptrace.h> |
| 41 | #include <asm/ptrace_offsets.h> |
| 42 | #include <asm/rse.h> |
| 43 | #include <asm/sections.h> |
| 44 | #include <asm/system.h> |
| 45 | #include <asm/uaccess.h> |
| 46 | |
| 47 | #include "entry.h" |
| 48 | #include "unwind_i.h" |
| 49 | |
| 50 | #define UNW_LOG_CACHE_SIZE 7 /* each unw_script is ~256 bytes in size */ |
| 51 | #define UNW_CACHE_SIZE (1 << UNW_LOG_CACHE_SIZE) |
| 52 | |
| 53 | #define UNW_LOG_HASH_SIZE (UNW_LOG_CACHE_SIZE + 1) |
| 54 | #define UNW_HASH_SIZE (1 << UNW_LOG_HASH_SIZE) |
| 55 | |
| 56 | #define UNW_STATS 0 /* WARNING: this disabled interrupts for long time-spans!! */ |
| 57 | |
| 58 | #ifdef UNW_DEBUG |
| 59 | static unsigned int unw_debug_level = UNW_DEBUG; |
| 60 | # define UNW_DEBUG_ON(n) unw_debug_level >= n |
| 61 | /* Do not code a printk level, not all debug lines end in newline */ |
| 62 | # define UNW_DPRINT(n, ...) if (UNW_DEBUG_ON(n)) printk(__VA_ARGS__) |
Kirill Korotaev | 690def2 | 2007-03-19 14:04:20 +0300 | [diff] [blame] | 63 | # undef inline |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | # define inline |
| 65 | #else /* !UNW_DEBUG */ |
| 66 | # define UNW_DEBUG_ON(n) 0 |
| 67 | # define UNW_DPRINT(n, ...) |
| 68 | #endif /* UNW_DEBUG */ |
| 69 | |
| 70 | #if UNW_STATS |
| 71 | # define STAT(x...) x |
| 72 | #else |
| 73 | # define STAT(x...) |
| 74 | #endif |
| 75 | |
| 76 | #define alloc_reg_state() kmalloc(sizeof(struct unw_reg_state), GFP_ATOMIC) |
| 77 | #define free_reg_state(usr) kfree(usr) |
| 78 | #define alloc_labeled_state() kmalloc(sizeof(struct unw_labeled_state), GFP_ATOMIC) |
| 79 | #define free_labeled_state(usr) kfree(usr) |
| 80 | |
| 81 | typedef unsigned long unw_word; |
| 82 | typedef unsigned char unw_hash_index_t; |
| 83 | |
| 84 | static struct { |
| 85 | spinlock_t lock; /* spinlock for unwind data */ |
| 86 | |
| 87 | /* list of unwind tables (one per load-module) */ |
| 88 | struct unw_table *tables; |
| 89 | |
| 90 | unsigned long r0; /* constant 0 for r0 */ |
| 91 | |
| 92 | /* table of registers that prologues can save (and order in which they're saved): */ |
| 93 | const unsigned char save_order[8]; |
| 94 | |
| 95 | /* maps a preserved register index (preg_index) to corresponding switch_stack offset: */ |
| 96 | unsigned short sw_off[sizeof(struct unw_frame_info) / 8]; |
| 97 | |
| 98 | unsigned short lru_head; /* index of lead-recently used script */ |
| 99 | unsigned short lru_tail; /* index of most-recently used script */ |
| 100 | |
| 101 | /* index into unw_frame_info for preserved register i */ |
| 102 | unsigned short preg_index[UNW_NUM_REGS]; |
| 103 | |
| 104 | short pt_regs_offsets[32]; |
| 105 | |
| 106 | /* unwind table for the kernel: */ |
| 107 | struct unw_table kernel_table; |
| 108 | |
| 109 | /* unwind table describing the gate page (kernel code that is mapped into user space): */ |
| 110 | size_t gate_table_size; |
| 111 | unsigned long *gate_table; |
| 112 | |
| 113 | /* hash table that maps instruction pointer to script index: */ |
| 114 | unsigned short hash[UNW_HASH_SIZE]; |
| 115 | |
| 116 | /* script cache: */ |
| 117 | struct unw_script cache[UNW_CACHE_SIZE]; |
| 118 | |
| 119 | # ifdef UNW_DEBUG |
| 120 | const char *preg_name[UNW_NUM_REGS]; |
| 121 | # endif |
| 122 | # if UNW_STATS |
| 123 | struct { |
| 124 | struct { |
| 125 | int lookups; |
| 126 | int hinted_hits; |
| 127 | int normal_hits; |
| 128 | int collision_chain_traversals; |
| 129 | } cache; |
| 130 | struct { |
| 131 | unsigned long build_time; |
| 132 | unsigned long run_time; |
| 133 | unsigned long parse_time; |
| 134 | int builds; |
| 135 | int news; |
| 136 | int collisions; |
| 137 | int runs; |
| 138 | } script; |
| 139 | struct { |
| 140 | unsigned long init_time; |
| 141 | unsigned long unwind_time; |
| 142 | int inits; |
| 143 | int unwinds; |
| 144 | } api; |
| 145 | } stat; |
| 146 | # endif |
| 147 | } unw = { |
| 148 | .tables = &unw.kernel_table, |
Milind Arun Choudhary | 8737d59 | 2007-04-15 22:51:23 +0530 | [diff] [blame] | 149 | .lock = __SPIN_LOCK_UNLOCKED(unw.lock), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | .save_order = { |
| 151 | UNW_REG_RP, UNW_REG_PFS, UNW_REG_PSP, UNW_REG_PR, |
| 152 | UNW_REG_UNAT, UNW_REG_LC, UNW_REG_FPSR, UNW_REG_PRI_UNAT_GR |
| 153 | }, |
| 154 | .preg_index = { |
| 155 | offsetof(struct unw_frame_info, pri_unat_loc)/8, /* PRI_UNAT_GR */ |
| 156 | offsetof(struct unw_frame_info, pri_unat_loc)/8, /* PRI_UNAT_MEM */ |
| 157 | offsetof(struct unw_frame_info, bsp_loc)/8, |
| 158 | offsetof(struct unw_frame_info, bspstore_loc)/8, |
| 159 | offsetof(struct unw_frame_info, pfs_loc)/8, |
| 160 | offsetof(struct unw_frame_info, rnat_loc)/8, |
| 161 | offsetof(struct unw_frame_info, psp)/8, |
| 162 | offsetof(struct unw_frame_info, rp_loc)/8, |
| 163 | offsetof(struct unw_frame_info, r4)/8, |
| 164 | offsetof(struct unw_frame_info, r5)/8, |
| 165 | offsetof(struct unw_frame_info, r6)/8, |
| 166 | offsetof(struct unw_frame_info, r7)/8, |
| 167 | offsetof(struct unw_frame_info, unat_loc)/8, |
| 168 | offsetof(struct unw_frame_info, pr_loc)/8, |
| 169 | offsetof(struct unw_frame_info, lc_loc)/8, |
| 170 | offsetof(struct unw_frame_info, fpsr_loc)/8, |
| 171 | offsetof(struct unw_frame_info, b1_loc)/8, |
| 172 | offsetof(struct unw_frame_info, b2_loc)/8, |
| 173 | offsetof(struct unw_frame_info, b3_loc)/8, |
| 174 | offsetof(struct unw_frame_info, b4_loc)/8, |
| 175 | offsetof(struct unw_frame_info, b5_loc)/8, |
| 176 | offsetof(struct unw_frame_info, f2_loc)/8, |
| 177 | offsetof(struct unw_frame_info, f3_loc)/8, |
| 178 | offsetof(struct unw_frame_info, f4_loc)/8, |
| 179 | offsetof(struct unw_frame_info, f5_loc)/8, |
| 180 | offsetof(struct unw_frame_info, fr_loc[16 - 16])/8, |
| 181 | offsetof(struct unw_frame_info, fr_loc[17 - 16])/8, |
| 182 | offsetof(struct unw_frame_info, fr_loc[18 - 16])/8, |
| 183 | offsetof(struct unw_frame_info, fr_loc[19 - 16])/8, |
| 184 | offsetof(struct unw_frame_info, fr_loc[20 - 16])/8, |
| 185 | offsetof(struct unw_frame_info, fr_loc[21 - 16])/8, |
| 186 | offsetof(struct unw_frame_info, fr_loc[22 - 16])/8, |
| 187 | offsetof(struct unw_frame_info, fr_loc[23 - 16])/8, |
| 188 | offsetof(struct unw_frame_info, fr_loc[24 - 16])/8, |
| 189 | offsetof(struct unw_frame_info, fr_loc[25 - 16])/8, |
| 190 | offsetof(struct unw_frame_info, fr_loc[26 - 16])/8, |
| 191 | offsetof(struct unw_frame_info, fr_loc[27 - 16])/8, |
| 192 | offsetof(struct unw_frame_info, fr_loc[28 - 16])/8, |
| 193 | offsetof(struct unw_frame_info, fr_loc[29 - 16])/8, |
| 194 | offsetof(struct unw_frame_info, fr_loc[30 - 16])/8, |
| 195 | offsetof(struct unw_frame_info, fr_loc[31 - 16])/8, |
| 196 | }, |
| 197 | .pt_regs_offsets = { |
| 198 | [0] = -1, |
| 199 | offsetof(struct pt_regs, r1), |
| 200 | offsetof(struct pt_regs, r2), |
| 201 | offsetof(struct pt_regs, r3), |
| 202 | [4] = -1, [5] = -1, [6] = -1, [7] = -1, |
| 203 | offsetof(struct pt_regs, r8), |
| 204 | offsetof(struct pt_regs, r9), |
| 205 | offsetof(struct pt_regs, r10), |
| 206 | offsetof(struct pt_regs, r11), |
| 207 | offsetof(struct pt_regs, r12), |
| 208 | offsetof(struct pt_regs, r13), |
| 209 | offsetof(struct pt_regs, r14), |
| 210 | offsetof(struct pt_regs, r15), |
| 211 | offsetof(struct pt_regs, r16), |
| 212 | offsetof(struct pt_regs, r17), |
| 213 | offsetof(struct pt_regs, r18), |
| 214 | offsetof(struct pt_regs, r19), |
| 215 | offsetof(struct pt_regs, r20), |
| 216 | offsetof(struct pt_regs, r21), |
| 217 | offsetof(struct pt_regs, r22), |
| 218 | offsetof(struct pt_regs, r23), |
| 219 | offsetof(struct pt_regs, r24), |
| 220 | offsetof(struct pt_regs, r25), |
| 221 | offsetof(struct pt_regs, r26), |
| 222 | offsetof(struct pt_regs, r27), |
| 223 | offsetof(struct pt_regs, r28), |
| 224 | offsetof(struct pt_regs, r29), |
| 225 | offsetof(struct pt_regs, r30), |
| 226 | offsetof(struct pt_regs, r31), |
| 227 | }, |
| 228 | .hash = { [0 ... UNW_HASH_SIZE - 1] = -1 }, |
| 229 | #ifdef UNW_DEBUG |
| 230 | .preg_name = { |
| 231 | "pri_unat_gr", "pri_unat_mem", "bsp", "bspstore", "ar.pfs", "ar.rnat", "psp", "rp", |
| 232 | "r4", "r5", "r6", "r7", |
| 233 | "ar.unat", "pr", "ar.lc", "ar.fpsr", |
| 234 | "b1", "b2", "b3", "b4", "b5", |
| 235 | "f2", "f3", "f4", "f5", |
| 236 | "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", |
| 237 | "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31" |
| 238 | } |
| 239 | #endif |
| 240 | }; |
| 241 | |
| 242 | static inline int |
| 243 | read_only (void *addr) |
| 244 | { |
| 245 | return (unsigned long) ((char *) addr - (char *) &unw.r0) < sizeof(unw.r0); |
| 246 | } |
| 247 | |
| 248 | /* |
| 249 | * Returns offset of rREG in struct pt_regs. |
| 250 | */ |
| 251 | static inline unsigned long |
| 252 | pt_regs_off (unsigned long reg) |
| 253 | { |
| 254 | short off = -1; |
| 255 | |
| 256 | if (reg < ARRAY_SIZE(unw.pt_regs_offsets)) |
| 257 | off = unw.pt_regs_offsets[reg]; |
| 258 | |
| 259 | if (off < 0) { |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 260 | UNW_DPRINT(0, "unwind.%s: bad scratch reg r%lu\n", __func__, reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | off = 0; |
| 262 | } |
| 263 | return (unsigned long) off; |
| 264 | } |
| 265 | |
| 266 | static inline struct pt_regs * |
| 267 | get_scratch_regs (struct unw_frame_info *info) |
| 268 | { |
| 269 | if (!info->pt) { |
| 270 | /* This should not happen with valid unwind info. */ |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 271 | UNW_DPRINT(0, "unwind.%s: bad unwind info: resetting info->pt\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | if (info->flags & UNW_FLAG_INTERRUPT_FRAME) |
| 273 | info->pt = (unsigned long) ((struct pt_regs *) info->psp - 1); |
| 274 | else |
| 275 | info->pt = info->sp - 16; |
| 276 | } |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 277 | UNW_DPRINT(3, "unwind.%s: sp 0x%lx pt 0x%lx\n", __func__, info->sp, info->pt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | return (struct pt_regs *) info->pt; |
| 279 | } |
| 280 | |
| 281 | /* Unwind accessors. */ |
| 282 | |
| 283 | int |
| 284 | unw_access_gr (struct unw_frame_info *info, int regnum, unsigned long *val, char *nat, int write) |
| 285 | { |
| 286 | unsigned long *addr, *nat_addr, nat_mask = 0, dummy_nat; |
| 287 | struct unw_ireg *ireg; |
| 288 | struct pt_regs *pt; |
| 289 | |
| 290 | if ((unsigned) regnum - 1 >= 127) { |
| 291 | if (regnum == 0 && !write) { |
| 292 | *val = 0; /* read r0 always returns 0 */ |
| 293 | *nat = 0; |
| 294 | return 0; |
| 295 | } |
| 296 | UNW_DPRINT(0, "unwind.%s: trying to access non-existent r%u\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 297 | __func__, regnum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | return -1; |
| 299 | } |
| 300 | |
| 301 | if (regnum < 32) { |
| 302 | if (regnum >= 4 && regnum <= 7) { |
| 303 | /* access a preserved register */ |
| 304 | ireg = &info->r4 + (regnum - 4); |
| 305 | addr = ireg->loc; |
| 306 | if (addr) { |
| 307 | nat_addr = addr + ireg->nat.off; |
| 308 | switch (ireg->nat.type) { |
| 309 | case UNW_NAT_VAL: |
| 310 | /* simulate getf.sig/setf.sig */ |
| 311 | if (write) { |
| 312 | if (*nat) { |
| 313 | /* write NaTVal and be done with it */ |
| 314 | addr[0] = 0; |
| 315 | addr[1] = 0x1fffe; |
| 316 | return 0; |
| 317 | } |
| 318 | addr[1] = 0x1003e; |
| 319 | } else { |
| 320 | if (addr[0] == 0 && addr[1] == 0x1ffe) { |
| 321 | /* return NaT and be done with it */ |
| 322 | *val = 0; |
| 323 | *nat = 1; |
| 324 | return 0; |
| 325 | } |
| 326 | } |
| 327 | /* fall through */ |
| 328 | case UNW_NAT_NONE: |
| 329 | dummy_nat = 0; |
| 330 | nat_addr = &dummy_nat; |
| 331 | break; |
| 332 | |
| 333 | case UNW_NAT_MEMSTK: |
| 334 | nat_mask = (1UL << ((long) addr & 0x1f8)/8); |
| 335 | break; |
| 336 | |
| 337 | case UNW_NAT_REGSTK: |
| 338 | nat_addr = ia64_rse_rnat_addr(addr); |
| 339 | if ((unsigned long) addr < info->regstk.limit |
| 340 | || (unsigned long) addr >= info->regstk.top) |
| 341 | { |
| 342 | UNW_DPRINT(0, "unwind.%s: %p outside of regstk " |
| 343 | "[0x%lx-0x%lx)\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 344 | __func__, (void *) addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | info->regstk.limit, |
| 346 | info->regstk.top); |
| 347 | return -1; |
| 348 | } |
| 349 | if ((unsigned long) nat_addr >= info->regstk.top) |
| 350 | nat_addr = &info->sw->ar_rnat; |
| 351 | nat_mask = (1UL << ia64_rse_slot_num(addr)); |
| 352 | break; |
| 353 | } |
| 354 | } else { |
| 355 | addr = &info->sw->r4 + (regnum - 4); |
| 356 | nat_addr = &info->sw->ar_unat; |
| 357 | nat_mask = (1UL << ((long) addr & 0x1f8)/8); |
| 358 | } |
| 359 | } else { |
| 360 | /* access a scratch register */ |
| 361 | pt = get_scratch_regs(info); |
| 362 | addr = (unsigned long *) ((unsigned long)pt + pt_regs_off(regnum)); |
| 363 | if (info->pri_unat_loc) |
| 364 | nat_addr = info->pri_unat_loc; |
| 365 | else |
Keith Owens | b833961 | 2005-07-21 23:41:00 -0700 | [diff] [blame] | 366 | nat_addr = &info->sw->caller_unat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | nat_mask = (1UL << ((long) addr & 0x1f8)/8); |
| 368 | } |
| 369 | } else { |
| 370 | /* access a stacked register */ |
| 371 | addr = ia64_rse_skip_regs((unsigned long *) info->bsp, regnum - 32); |
| 372 | nat_addr = ia64_rse_rnat_addr(addr); |
| 373 | if ((unsigned long) addr < info->regstk.limit |
| 374 | || (unsigned long) addr >= info->regstk.top) |
| 375 | { |
| 376 | UNW_DPRINT(0, "unwind.%s: ignoring attempt to access register outside " |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 377 | "of rbs\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | return -1; |
| 379 | } |
| 380 | if ((unsigned long) nat_addr >= info->regstk.top) |
| 381 | nat_addr = &info->sw->ar_rnat; |
| 382 | nat_mask = (1UL << ia64_rse_slot_num(addr)); |
| 383 | } |
| 384 | |
| 385 | if (write) { |
| 386 | if (read_only(addr)) { |
| 387 | UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 388 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | } else { |
| 390 | *addr = *val; |
| 391 | if (*nat) |
| 392 | *nat_addr |= nat_mask; |
| 393 | else |
| 394 | *nat_addr &= ~nat_mask; |
| 395 | } |
| 396 | } else { |
| 397 | if ((*nat_addr & nat_mask) == 0) { |
| 398 | *val = *addr; |
| 399 | *nat = 0; |
| 400 | } else { |
| 401 | *val = 0; /* if register is a NaT, *addr may contain kernel data! */ |
| 402 | *nat = 1; |
| 403 | } |
| 404 | } |
| 405 | return 0; |
| 406 | } |
| 407 | EXPORT_SYMBOL(unw_access_gr); |
| 408 | |
| 409 | int |
| 410 | unw_access_br (struct unw_frame_info *info, int regnum, unsigned long *val, int write) |
| 411 | { |
| 412 | unsigned long *addr; |
| 413 | struct pt_regs *pt; |
| 414 | |
| 415 | switch (regnum) { |
| 416 | /* scratch: */ |
| 417 | case 0: pt = get_scratch_regs(info); addr = &pt->b0; break; |
| 418 | case 6: pt = get_scratch_regs(info); addr = &pt->b6; break; |
| 419 | case 7: pt = get_scratch_regs(info); addr = &pt->b7; break; |
| 420 | |
| 421 | /* preserved: */ |
| 422 | case 1: case 2: case 3: case 4: case 5: |
| 423 | addr = *(&info->b1_loc + (regnum - 1)); |
| 424 | if (!addr) |
| 425 | addr = &info->sw->b1 + (regnum - 1); |
| 426 | break; |
| 427 | |
| 428 | default: |
| 429 | UNW_DPRINT(0, "unwind.%s: trying to access non-existent b%u\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 430 | __func__, regnum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | return -1; |
| 432 | } |
| 433 | if (write) |
| 434 | if (read_only(addr)) { |
| 435 | UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 436 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | } else |
| 438 | *addr = *val; |
| 439 | else |
| 440 | *val = *addr; |
| 441 | return 0; |
| 442 | } |
| 443 | EXPORT_SYMBOL(unw_access_br); |
| 444 | |
| 445 | int |
| 446 | unw_access_fr (struct unw_frame_info *info, int regnum, struct ia64_fpreg *val, int write) |
| 447 | { |
| 448 | struct ia64_fpreg *addr = NULL; |
| 449 | struct pt_regs *pt; |
| 450 | |
| 451 | if ((unsigned) (regnum - 2) >= 126) { |
| 452 | UNW_DPRINT(0, "unwind.%s: trying to access non-existent f%u\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 453 | __func__, regnum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | return -1; |
| 455 | } |
| 456 | |
| 457 | if (regnum <= 5) { |
| 458 | addr = *(&info->f2_loc + (regnum - 2)); |
| 459 | if (!addr) |
| 460 | addr = &info->sw->f2 + (regnum - 2); |
| 461 | } else if (regnum <= 15) { |
| 462 | if (regnum <= 11) { |
| 463 | pt = get_scratch_regs(info); |
| 464 | addr = &pt->f6 + (regnum - 6); |
| 465 | } |
| 466 | else |
| 467 | addr = &info->sw->f12 + (regnum - 12); |
| 468 | } else if (regnum <= 31) { |
| 469 | addr = info->fr_loc[regnum - 16]; |
| 470 | if (!addr) |
| 471 | addr = &info->sw->f16 + (regnum - 16); |
| 472 | } else { |
| 473 | struct task_struct *t = info->task; |
| 474 | |
| 475 | if (write) |
| 476 | ia64_sync_fph(t); |
| 477 | else |
| 478 | ia64_flush_fph(t); |
| 479 | addr = t->thread.fph + (regnum - 32); |
| 480 | } |
| 481 | |
| 482 | if (write) |
| 483 | if (read_only(addr)) { |
| 484 | UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 485 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | } else |
| 487 | *addr = *val; |
| 488 | else |
| 489 | *val = *addr; |
| 490 | return 0; |
| 491 | } |
| 492 | EXPORT_SYMBOL(unw_access_fr); |
| 493 | |
| 494 | int |
| 495 | unw_access_ar (struct unw_frame_info *info, int regnum, unsigned long *val, int write) |
| 496 | { |
| 497 | unsigned long *addr; |
| 498 | struct pt_regs *pt; |
| 499 | |
| 500 | switch (regnum) { |
| 501 | case UNW_AR_BSP: |
| 502 | addr = info->bsp_loc; |
| 503 | if (!addr) |
| 504 | addr = &info->sw->ar_bspstore; |
| 505 | break; |
| 506 | |
| 507 | case UNW_AR_BSPSTORE: |
| 508 | addr = info->bspstore_loc; |
| 509 | if (!addr) |
| 510 | addr = &info->sw->ar_bspstore; |
| 511 | break; |
| 512 | |
| 513 | case UNW_AR_PFS: |
| 514 | addr = info->pfs_loc; |
| 515 | if (!addr) |
| 516 | addr = &info->sw->ar_pfs; |
| 517 | break; |
| 518 | |
| 519 | case UNW_AR_RNAT: |
| 520 | addr = info->rnat_loc; |
| 521 | if (!addr) |
| 522 | addr = &info->sw->ar_rnat; |
| 523 | break; |
| 524 | |
| 525 | case UNW_AR_UNAT: |
| 526 | addr = info->unat_loc; |
| 527 | if (!addr) |
Keith Owens | b833961 | 2005-07-21 23:41:00 -0700 | [diff] [blame] | 528 | addr = &info->sw->caller_unat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | break; |
| 530 | |
| 531 | case UNW_AR_LC: |
| 532 | addr = info->lc_loc; |
| 533 | if (!addr) |
| 534 | addr = &info->sw->ar_lc; |
| 535 | break; |
| 536 | |
| 537 | case UNW_AR_EC: |
| 538 | if (!info->cfm_loc) |
| 539 | return -1; |
| 540 | if (write) |
| 541 | *info->cfm_loc = |
| 542 | (*info->cfm_loc & ~(0x3fUL << 52)) | ((*val & 0x3f) << 52); |
| 543 | else |
| 544 | *val = (*info->cfm_loc >> 52) & 0x3f; |
| 545 | return 0; |
| 546 | |
| 547 | case UNW_AR_FPSR: |
| 548 | addr = info->fpsr_loc; |
| 549 | if (!addr) |
| 550 | addr = &info->sw->ar_fpsr; |
| 551 | break; |
| 552 | |
| 553 | case UNW_AR_RSC: |
| 554 | pt = get_scratch_regs(info); |
| 555 | addr = &pt->ar_rsc; |
| 556 | break; |
| 557 | |
| 558 | case UNW_AR_CCV: |
| 559 | pt = get_scratch_regs(info); |
| 560 | addr = &pt->ar_ccv; |
| 561 | break; |
| 562 | |
| 563 | case UNW_AR_CSD: |
| 564 | pt = get_scratch_regs(info); |
| 565 | addr = &pt->ar_csd; |
| 566 | break; |
| 567 | |
| 568 | case UNW_AR_SSD: |
| 569 | pt = get_scratch_regs(info); |
| 570 | addr = &pt->ar_ssd; |
| 571 | break; |
| 572 | |
| 573 | default: |
| 574 | UNW_DPRINT(0, "unwind.%s: trying to access non-existent ar%u\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 575 | __func__, regnum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | return -1; |
| 577 | } |
| 578 | |
| 579 | if (write) { |
| 580 | if (read_only(addr)) { |
| 581 | UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 582 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | } else |
| 584 | *addr = *val; |
| 585 | } else |
| 586 | *val = *addr; |
| 587 | return 0; |
| 588 | } |
| 589 | EXPORT_SYMBOL(unw_access_ar); |
| 590 | |
| 591 | int |
| 592 | unw_access_pr (struct unw_frame_info *info, unsigned long *val, int write) |
| 593 | { |
| 594 | unsigned long *addr; |
| 595 | |
| 596 | addr = info->pr_loc; |
| 597 | if (!addr) |
| 598 | addr = &info->sw->pr; |
| 599 | |
| 600 | if (write) { |
| 601 | if (read_only(addr)) { |
| 602 | UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 603 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | } else |
| 605 | *addr = *val; |
| 606 | } else |
| 607 | *val = *addr; |
| 608 | return 0; |
| 609 | } |
| 610 | EXPORT_SYMBOL(unw_access_pr); |
| 611 | |
| 612 | |
| 613 | /* Routines to manipulate the state stack. */ |
| 614 | |
| 615 | static inline void |
| 616 | push (struct unw_state_record *sr) |
| 617 | { |
| 618 | struct unw_reg_state *rs; |
| 619 | |
| 620 | rs = alloc_reg_state(); |
| 621 | if (!rs) { |
| 622 | printk(KERN_ERR "unwind: cannot stack reg state!\n"); |
| 623 | return; |
| 624 | } |
| 625 | memcpy(rs, &sr->curr, sizeof(*rs)); |
| 626 | sr->curr.next = rs; |
| 627 | } |
| 628 | |
| 629 | static void |
| 630 | pop (struct unw_state_record *sr) |
| 631 | { |
| 632 | struct unw_reg_state *rs = sr->curr.next; |
| 633 | |
| 634 | if (!rs) { |
| 635 | printk(KERN_ERR "unwind: stack underflow!\n"); |
| 636 | return; |
| 637 | } |
| 638 | memcpy(&sr->curr, rs, sizeof(*rs)); |
| 639 | free_reg_state(rs); |
| 640 | } |
| 641 | |
| 642 | /* Make a copy of the state stack. Non-recursive to avoid stack overflows. */ |
| 643 | static struct unw_reg_state * |
| 644 | dup_state_stack (struct unw_reg_state *rs) |
| 645 | { |
| 646 | struct unw_reg_state *copy, *prev = NULL, *first = NULL; |
| 647 | |
| 648 | while (rs) { |
| 649 | copy = alloc_reg_state(); |
| 650 | if (!copy) { |
| 651 | printk(KERN_ERR "unwind.dup_state_stack: out of memory\n"); |
| 652 | return NULL; |
| 653 | } |
| 654 | memcpy(copy, rs, sizeof(*copy)); |
| 655 | if (first) |
| 656 | prev->next = copy; |
| 657 | else |
| 658 | first = copy; |
| 659 | rs = rs->next; |
| 660 | prev = copy; |
| 661 | } |
| 662 | return first; |
| 663 | } |
| 664 | |
| 665 | /* Free all stacked register states (but not RS itself). */ |
| 666 | static void |
| 667 | free_state_stack (struct unw_reg_state *rs) |
| 668 | { |
| 669 | struct unw_reg_state *p, *next; |
| 670 | |
| 671 | for (p = rs->next; p != NULL; p = next) { |
| 672 | next = p->next; |
| 673 | free_reg_state(p); |
| 674 | } |
| 675 | rs->next = NULL; |
| 676 | } |
| 677 | |
| 678 | /* Unwind decoder routines */ |
| 679 | |
| 680 | static enum unw_register_index __attribute_const__ |
| 681 | decode_abreg (unsigned char abreg, int memory) |
| 682 | { |
| 683 | switch (abreg) { |
| 684 | case 0x04 ... 0x07: return UNW_REG_R4 + (abreg - 0x04); |
| 685 | case 0x22 ... 0x25: return UNW_REG_F2 + (abreg - 0x22); |
| 686 | case 0x30 ... 0x3f: return UNW_REG_F16 + (abreg - 0x30); |
| 687 | case 0x41 ... 0x45: return UNW_REG_B1 + (abreg - 0x41); |
| 688 | case 0x60: return UNW_REG_PR; |
| 689 | case 0x61: return UNW_REG_PSP; |
| 690 | case 0x62: return memory ? UNW_REG_PRI_UNAT_MEM : UNW_REG_PRI_UNAT_GR; |
| 691 | case 0x63: return UNW_REG_RP; |
| 692 | case 0x64: return UNW_REG_BSP; |
| 693 | case 0x65: return UNW_REG_BSPSTORE; |
| 694 | case 0x66: return UNW_REG_RNAT; |
| 695 | case 0x67: return UNW_REG_UNAT; |
| 696 | case 0x68: return UNW_REG_FPSR; |
| 697 | case 0x69: return UNW_REG_PFS; |
| 698 | case 0x6a: return UNW_REG_LC; |
| 699 | default: |
| 700 | break; |
| 701 | } |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 702 | UNW_DPRINT(0, "unwind.%s: bad abreg=0x%x\n", __func__, abreg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | return UNW_REG_LC; |
| 704 | } |
| 705 | |
| 706 | static void |
| 707 | set_reg (struct unw_reg_info *reg, enum unw_where where, int when, unsigned long val) |
| 708 | { |
| 709 | reg->val = val; |
| 710 | reg->where = where; |
| 711 | if (reg->when == UNW_WHEN_NEVER) |
| 712 | reg->when = when; |
| 713 | } |
| 714 | |
| 715 | static void |
| 716 | alloc_spill_area (unsigned long *offp, unsigned long regsize, |
| 717 | struct unw_reg_info *lo, struct unw_reg_info *hi) |
| 718 | { |
| 719 | struct unw_reg_info *reg; |
| 720 | |
| 721 | for (reg = hi; reg >= lo; --reg) { |
| 722 | if (reg->where == UNW_WHERE_SPILL_HOME) { |
| 723 | reg->where = UNW_WHERE_PSPREL; |
| 724 | *offp -= regsize; |
| 725 | reg->val = *offp; |
| 726 | } |
| 727 | } |
| 728 | } |
| 729 | |
| 730 | static inline void |
| 731 | spill_next_when (struct unw_reg_info **regp, struct unw_reg_info *lim, unw_word t) |
| 732 | { |
| 733 | struct unw_reg_info *reg; |
| 734 | |
| 735 | for (reg = *regp; reg <= lim; ++reg) { |
| 736 | if (reg->where == UNW_WHERE_SPILL_HOME) { |
| 737 | reg->when = t; |
| 738 | *regp = reg + 1; |
| 739 | return; |
| 740 | } |
| 741 | } |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 742 | UNW_DPRINT(0, "unwind.%s: excess spill!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | } |
| 744 | |
| 745 | static inline void |
| 746 | finish_prologue (struct unw_state_record *sr) |
| 747 | { |
| 748 | struct unw_reg_info *reg; |
| 749 | unsigned long off; |
| 750 | int i; |
| 751 | |
| 752 | /* |
| 753 | * First, resolve implicit register save locations (see Section "11.4.2.3 Rules |
| 754 | * for Using Unwind Descriptors", rule 3): |
| 755 | */ |
| 756 | for (i = 0; i < (int) ARRAY_SIZE(unw.save_order); ++i) { |
| 757 | reg = sr->curr.reg + unw.save_order[i]; |
| 758 | if (reg->where == UNW_WHERE_GR_SAVE) { |
| 759 | reg->where = UNW_WHERE_GR; |
| 760 | reg->val = sr->gr_save_loc++; |
| 761 | } |
| 762 | } |
| 763 | |
| 764 | /* |
| 765 | * Next, compute when the fp, general, and branch registers get |
| 766 | * saved. This must come before alloc_spill_area() because |
| 767 | * we need to know which registers are spilled to their home |
| 768 | * locations. |
| 769 | */ |
| 770 | if (sr->imask) { |
| 771 | unsigned char kind, mask = 0, *cp = sr->imask; |
| 772 | int t; |
| 773 | static const unsigned char limit[3] = { |
| 774 | UNW_REG_F31, UNW_REG_R7, UNW_REG_B5 |
| 775 | }; |
| 776 | struct unw_reg_info *(regs[3]); |
| 777 | |
| 778 | regs[0] = sr->curr.reg + UNW_REG_F2; |
| 779 | regs[1] = sr->curr.reg + UNW_REG_R4; |
| 780 | regs[2] = sr->curr.reg + UNW_REG_B1; |
| 781 | |
| 782 | for (t = 0; t < sr->region_len; ++t) { |
| 783 | if ((t & 3) == 0) |
| 784 | mask = *cp++; |
| 785 | kind = (mask >> 2*(3-(t & 3))) & 3; |
| 786 | if (kind > 0) |
| 787 | spill_next_when(®s[kind - 1], sr->curr.reg + limit[kind - 1], |
| 788 | sr->region_start + t); |
| 789 | } |
| 790 | } |
| 791 | /* |
| 792 | * Next, lay out the memory stack spill area: |
| 793 | */ |
| 794 | if (sr->any_spills) { |
| 795 | off = sr->spill_offset; |
| 796 | alloc_spill_area(&off, 16, sr->curr.reg + UNW_REG_F2, sr->curr.reg + UNW_REG_F31); |
| 797 | alloc_spill_area(&off, 8, sr->curr.reg + UNW_REG_B1, sr->curr.reg + UNW_REG_B5); |
| 798 | alloc_spill_area(&off, 8, sr->curr.reg + UNW_REG_R4, sr->curr.reg + UNW_REG_R7); |
| 799 | } |
| 800 | } |
| 801 | |
| 802 | /* |
| 803 | * Region header descriptors. |
| 804 | */ |
| 805 | |
| 806 | static void |
| 807 | desc_prologue (int body, unw_word rlen, unsigned char mask, unsigned char grsave, |
| 808 | struct unw_state_record *sr) |
| 809 | { |
| 810 | int i, region_start; |
| 811 | |
| 812 | if (!(sr->in_body || sr->first_region)) |
| 813 | finish_prologue(sr); |
| 814 | sr->first_region = 0; |
| 815 | |
| 816 | /* check if we're done: */ |
| 817 | if (sr->when_target < sr->region_start + sr->region_len) { |
| 818 | sr->done = 1; |
| 819 | return; |
| 820 | } |
| 821 | |
| 822 | region_start = sr->region_start + sr->region_len; |
| 823 | |
| 824 | for (i = 0; i < sr->epilogue_count; ++i) |
| 825 | pop(sr); |
| 826 | sr->epilogue_count = 0; |
| 827 | sr->epilogue_start = UNW_WHEN_NEVER; |
| 828 | |
| 829 | sr->region_start = region_start; |
| 830 | sr->region_len = rlen; |
| 831 | sr->in_body = body; |
| 832 | |
| 833 | if (!body) { |
| 834 | push(sr); |
| 835 | |
| 836 | for (i = 0; i < 4; ++i) { |
| 837 | if (mask & 0x8) |
| 838 | set_reg(sr->curr.reg + unw.save_order[i], UNW_WHERE_GR, |
| 839 | sr->region_start + sr->region_len - 1, grsave++); |
| 840 | mask <<= 1; |
| 841 | } |
| 842 | sr->gr_save_loc = grsave; |
| 843 | sr->any_spills = 0; |
| 844 | sr->imask = NULL; |
| 845 | sr->spill_offset = 0x10; /* default to psp+16 */ |
| 846 | } |
| 847 | } |
| 848 | |
| 849 | /* |
| 850 | * Prologue descriptors. |
| 851 | */ |
| 852 | |
| 853 | static inline void |
| 854 | desc_abi (unsigned char abi, unsigned char context, struct unw_state_record *sr) |
| 855 | { |
| 856 | if (abi == 3 && context == 'i') { |
| 857 | sr->flags |= UNW_FLAG_INTERRUPT_FRAME; |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 858 | UNW_DPRINT(3, "unwind.%s: interrupt frame\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | } |
| 860 | else |
| 861 | UNW_DPRINT(0, "unwind%s: ignoring unwabi(abi=0x%x,context=0x%x)\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 862 | __func__, abi, context); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | } |
| 864 | |
| 865 | static inline void |
| 866 | desc_br_gr (unsigned char brmask, unsigned char gr, struct unw_state_record *sr) |
| 867 | { |
| 868 | int i; |
| 869 | |
| 870 | for (i = 0; i < 5; ++i) { |
| 871 | if (brmask & 1) |
| 872 | set_reg(sr->curr.reg + UNW_REG_B1 + i, UNW_WHERE_GR, |
| 873 | sr->region_start + sr->region_len - 1, gr++); |
| 874 | brmask >>= 1; |
| 875 | } |
| 876 | } |
| 877 | |
| 878 | static inline void |
| 879 | desc_br_mem (unsigned char brmask, struct unw_state_record *sr) |
| 880 | { |
| 881 | int i; |
| 882 | |
| 883 | for (i = 0; i < 5; ++i) { |
| 884 | if (brmask & 1) { |
| 885 | set_reg(sr->curr.reg + UNW_REG_B1 + i, UNW_WHERE_SPILL_HOME, |
| 886 | sr->region_start + sr->region_len - 1, 0); |
| 887 | sr->any_spills = 1; |
| 888 | } |
| 889 | brmask >>= 1; |
| 890 | } |
| 891 | } |
| 892 | |
| 893 | static inline void |
| 894 | desc_frgr_mem (unsigned char grmask, unw_word frmask, struct unw_state_record *sr) |
| 895 | { |
| 896 | int i; |
| 897 | |
| 898 | for (i = 0; i < 4; ++i) { |
| 899 | if ((grmask & 1) != 0) { |
| 900 | set_reg(sr->curr.reg + UNW_REG_R4 + i, UNW_WHERE_SPILL_HOME, |
| 901 | sr->region_start + sr->region_len - 1, 0); |
| 902 | sr->any_spills = 1; |
| 903 | } |
| 904 | grmask >>= 1; |
| 905 | } |
| 906 | for (i = 0; i < 20; ++i) { |
| 907 | if ((frmask & 1) != 0) { |
| 908 | int base = (i < 4) ? UNW_REG_F2 : UNW_REG_F16 - 4; |
| 909 | set_reg(sr->curr.reg + base + i, UNW_WHERE_SPILL_HOME, |
| 910 | sr->region_start + sr->region_len - 1, 0); |
| 911 | sr->any_spills = 1; |
| 912 | } |
| 913 | frmask >>= 1; |
| 914 | } |
| 915 | } |
| 916 | |
| 917 | static inline void |
| 918 | desc_fr_mem (unsigned char frmask, struct unw_state_record *sr) |
| 919 | { |
| 920 | int i; |
| 921 | |
| 922 | for (i = 0; i < 4; ++i) { |
| 923 | if ((frmask & 1) != 0) { |
| 924 | set_reg(sr->curr.reg + UNW_REG_F2 + i, UNW_WHERE_SPILL_HOME, |
| 925 | sr->region_start + sr->region_len - 1, 0); |
| 926 | sr->any_spills = 1; |
| 927 | } |
| 928 | frmask >>= 1; |
| 929 | } |
| 930 | } |
| 931 | |
| 932 | static inline void |
| 933 | desc_gr_gr (unsigned char grmask, unsigned char gr, struct unw_state_record *sr) |
| 934 | { |
| 935 | int i; |
| 936 | |
| 937 | for (i = 0; i < 4; ++i) { |
| 938 | if ((grmask & 1) != 0) |
| 939 | set_reg(sr->curr.reg + UNW_REG_R4 + i, UNW_WHERE_GR, |
| 940 | sr->region_start + sr->region_len - 1, gr++); |
| 941 | grmask >>= 1; |
| 942 | } |
| 943 | } |
| 944 | |
| 945 | static inline void |
| 946 | desc_gr_mem (unsigned char grmask, struct unw_state_record *sr) |
| 947 | { |
| 948 | int i; |
| 949 | |
| 950 | for (i = 0; i < 4; ++i) { |
| 951 | if ((grmask & 1) != 0) { |
| 952 | set_reg(sr->curr.reg + UNW_REG_R4 + i, UNW_WHERE_SPILL_HOME, |
| 953 | sr->region_start + sr->region_len - 1, 0); |
| 954 | sr->any_spills = 1; |
| 955 | } |
| 956 | grmask >>= 1; |
| 957 | } |
| 958 | } |
| 959 | |
| 960 | static inline void |
| 961 | desc_mem_stack_f (unw_word t, unw_word size, struct unw_state_record *sr) |
| 962 | { |
| 963 | set_reg(sr->curr.reg + UNW_REG_PSP, UNW_WHERE_NONE, |
| 964 | sr->region_start + min_t(int, t, sr->region_len - 1), 16*size); |
| 965 | } |
| 966 | |
| 967 | static inline void |
| 968 | desc_mem_stack_v (unw_word t, struct unw_state_record *sr) |
| 969 | { |
| 970 | sr->curr.reg[UNW_REG_PSP].when = sr->region_start + min_t(int, t, sr->region_len - 1); |
| 971 | } |
| 972 | |
| 973 | static inline void |
| 974 | desc_reg_gr (unsigned char reg, unsigned char dst, struct unw_state_record *sr) |
| 975 | { |
| 976 | set_reg(sr->curr.reg + reg, UNW_WHERE_GR, sr->region_start + sr->region_len - 1, dst); |
| 977 | } |
| 978 | |
| 979 | static inline void |
| 980 | desc_reg_psprel (unsigned char reg, unw_word pspoff, struct unw_state_record *sr) |
| 981 | { |
| 982 | set_reg(sr->curr.reg + reg, UNW_WHERE_PSPREL, sr->region_start + sr->region_len - 1, |
| 983 | 0x10 - 4*pspoff); |
| 984 | } |
| 985 | |
| 986 | static inline void |
| 987 | desc_reg_sprel (unsigned char reg, unw_word spoff, struct unw_state_record *sr) |
| 988 | { |
| 989 | set_reg(sr->curr.reg + reg, UNW_WHERE_SPREL, sr->region_start + sr->region_len - 1, |
| 990 | 4*spoff); |
| 991 | } |
| 992 | |
| 993 | static inline void |
| 994 | desc_rp_br (unsigned char dst, struct unw_state_record *sr) |
| 995 | { |
| 996 | sr->return_link_reg = dst; |
| 997 | } |
| 998 | |
| 999 | static inline void |
| 1000 | desc_reg_when (unsigned char regnum, unw_word t, struct unw_state_record *sr) |
| 1001 | { |
| 1002 | struct unw_reg_info *reg = sr->curr.reg + regnum; |
| 1003 | |
| 1004 | if (reg->where == UNW_WHERE_NONE) |
| 1005 | reg->where = UNW_WHERE_GR_SAVE; |
| 1006 | reg->when = sr->region_start + min_t(int, t, sr->region_len - 1); |
| 1007 | } |
| 1008 | |
| 1009 | static inline void |
| 1010 | desc_spill_base (unw_word pspoff, struct unw_state_record *sr) |
| 1011 | { |
| 1012 | sr->spill_offset = 0x10 - 4*pspoff; |
| 1013 | } |
| 1014 | |
| 1015 | static inline unsigned char * |
| 1016 | desc_spill_mask (unsigned char *imaskp, struct unw_state_record *sr) |
| 1017 | { |
| 1018 | sr->imask = imaskp; |
| 1019 | return imaskp + (2*sr->region_len + 7)/8; |
| 1020 | } |
| 1021 | |
| 1022 | /* |
| 1023 | * Body descriptors. |
| 1024 | */ |
| 1025 | static inline void |
| 1026 | desc_epilogue (unw_word t, unw_word ecount, struct unw_state_record *sr) |
| 1027 | { |
| 1028 | sr->epilogue_start = sr->region_start + sr->region_len - 1 - t; |
| 1029 | sr->epilogue_count = ecount + 1; |
| 1030 | } |
| 1031 | |
| 1032 | static inline void |
| 1033 | desc_copy_state (unw_word label, struct unw_state_record *sr) |
| 1034 | { |
| 1035 | struct unw_labeled_state *ls; |
| 1036 | |
| 1037 | for (ls = sr->labeled_states; ls; ls = ls->next) { |
| 1038 | if (ls->label == label) { |
| 1039 | free_state_stack(&sr->curr); |
| 1040 | memcpy(&sr->curr, &ls->saved_state, sizeof(sr->curr)); |
| 1041 | sr->curr.next = dup_state_stack(ls->saved_state.next); |
| 1042 | return; |
| 1043 | } |
| 1044 | } |
| 1045 | printk(KERN_ERR "unwind: failed to find state labeled 0x%lx\n", label); |
| 1046 | } |
| 1047 | |
| 1048 | static inline void |
| 1049 | desc_label_state (unw_word label, struct unw_state_record *sr) |
| 1050 | { |
| 1051 | struct unw_labeled_state *ls; |
| 1052 | |
| 1053 | ls = alloc_labeled_state(); |
| 1054 | if (!ls) { |
| 1055 | printk(KERN_ERR "unwind.desc_label_state(): out of memory\n"); |
| 1056 | return; |
| 1057 | } |
| 1058 | ls->label = label; |
| 1059 | memcpy(&ls->saved_state, &sr->curr, sizeof(ls->saved_state)); |
| 1060 | ls->saved_state.next = dup_state_stack(sr->curr.next); |
| 1061 | |
| 1062 | /* insert into list of labeled states: */ |
| 1063 | ls->next = sr->labeled_states; |
| 1064 | sr->labeled_states = ls; |
| 1065 | } |
| 1066 | |
| 1067 | /* |
| 1068 | * General descriptors. |
| 1069 | */ |
| 1070 | |
| 1071 | static inline int |
| 1072 | desc_is_active (unsigned char qp, unw_word t, struct unw_state_record *sr) |
| 1073 | { |
| 1074 | if (sr->when_target <= sr->region_start + min_t(int, t, sr->region_len - 1)) |
| 1075 | return 0; |
| 1076 | if (qp > 0) { |
| 1077 | if ((sr->pr_val & (1UL << qp)) == 0) |
| 1078 | return 0; |
| 1079 | sr->pr_mask |= (1UL << qp); |
| 1080 | } |
| 1081 | return 1; |
| 1082 | } |
| 1083 | |
| 1084 | static inline void |
| 1085 | desc_restore_p (unsigned char qp, unw_word t, unsigned char abreg, struct unw_state_record *sr) |
| 1086 | { |
| 1087 | struct unw_reg_info *r; |
| 1088 | |
| 1089 | if (!desc_is_active(qp, t, sr)) |
| 1090 | return; |
| 1091 | |
| 1092 | r = sr->curr.reg + decode_abreg(abreg, 0); |
| 1093 | r->where = UNW_WHERE_NONE; |
| 1094 | r->when = UNW_WHEN_NEVER; |
| 1095 | r->val = 0; |
| 1096 | } |
| 1097 | |
| 1098 | static inline void |
| 1099 | desc_spill_reg_p (unsigned char qp, unw_word t, unsigned char abreg, unsigned char x, |
| 1100 | unsigned char ytreg, struct unw_state_record *sr) |
| 1101 | { |
| 1102 | enum unw_where where = UNW_WHERE_GR; |
| 1103 | struct unw_reg_info *r; |
| 1104 | |
| 1105 | if (!desc_is_active(qp, t, sr)) |
| 1106 | return; |
| 1107 | |
| 1108 | if (x) |
| 1109 | where = UNW_WHERE_BR; |
| 1110 | else if (ytreg & 0x80) |
| 1111 | where = UNW_WHERE_FR; |
| 1112 | |
| 1113 | r = sr->curr.reg + decode_abreg(abreg, 0); |
| 1114 | r->where = where; |
| 1115 | r->when = sr->region_start + min_t(int, t, sr->region_len - 1); |
| 1116 | r->val = (ytreg & 0x7f); |
| 1117 | } |
| 1118 | |
| 1119 | static inline void |
| 1120 | desc_spill_psprel_p (unsigned char qp, unw_word t, unsigned char abreg, unw_word pspoff, |
| 1121 | struct unw_state_record *sr) |
| 1122 | { |
| 1123 | struct unw_reg_info *r; |
| 1124 | |
| 1125 | if (!desc_is_active(qp, t, sr)) |
| 1126 | return; |
| 1127 | |
| 1128 | r = sr->curr.reg + decode_abreg(abreg, 1); |
| 1129 | r->where = UNW_WHERE_PSPREL; |
| 1130 | r->when = sr->region_start + min_t(int, t, sr->region_len - 1); |
| 1131 | r->val = 0x10 - 4*pspoff; |
| 1132 | } |
| 1133 | |
| 1134 | static inline void |
| 1135 | desc_spill_sprel_p (unsigned char qp, unw_word t, unsigned char abreg, unw_word spoff, |
| 1136 | struct unw_state_record *sr) |
| 1137 | { |
| 1138 | struct unw_reg_info *r; |
| 1139 | |
| 1140 | if (!desc_is_active(qp, t, sr)) |
| 1141 | return; |
| 1142 | |
| 1143 | r = sr->curr.reg + decode_abreg(abreg, 1); |
| 1144 | r->where = UNW_WHERE_SPREL; |
| 1145 | r->when = sr->region_start + min_t(int, t, sr->region_len - 1); |
| 1146 | r->val = 4*spoff; |
| 1147 | } |
| 1148 | |
| 1149 | #define UNW_DEC_BAD_CODE(code) printk(KERN_ERR "unwind: unknown code 0x%02x\n", \ |
| 1150 | code); |
| 1151 | |
| 1152 | /* |
| 1153 | * region headers: |
| 1154 | */ |
| 1155 | #define UNW_DEC_PROLOGUE_GR(fmt,r,m,gr,arg) desc_prologue(0,r,m,gr,arg) |
| 1156 | #define UNW_DEC_PROLOGUE(fmt,b,r,arg) desc_prologue(b,r,0,32,arg) |
| 1157 | /* |
| 1158 | * prologue descriptors: |
| 1159 | */ |
| 1160 | #define UNW_DEC_ABI(fmt,a,c,arg) desc_abi(a,c,arg) |
| 1161 | #define UNW_DEC_BR_GR(fmt,b,g,arg) desc_br_gr(b,g,arg) |
| 1162 | #define UNW_DEC_BR_MEM(fmt,b,arg) desc_br_mem(b,arg) |
| 1163 | #define UNW_DEC_FRGR_MEM(fmt,g,f,arg) desc_frgr_mem(g,f,arg) |
| 1164 | #define UNW_DEC_FR_MEM(fmt,f,arg) desc_fr_mem(f,arg) |
| 1165 | #define UNW_DEC_GR_GR(fmt,m,g,arg) desc_gr_gr(m,g,arg) |
| 1166 | #define UNW_DEC_GR_MEM(fmt,m,arg) desc_gr_mem(m,arg) |
| 1167 | #define UNW_DEC_MEM_STACK_F(fmt,t,s,arg) desc_mem_stack_f(t,s,arg) |
| 1168 | #define UNW_DEC_MEM_STACK_V(fmt,t,arg) desc_mem_stack_v(t,arg) |
| 1169 | #define UNW_DEC_REG_GR(fmt,r,d,arg) desc_reg_gr(r,d,arg) |
| 1170 | #define UNW_DEC_REG_PSPREL(fmt,r,o,arg) desc_reg_psprel(r,o,arg) |
| 1171 | #define UNW_DEC_REG_SPREL(fmt,r,o,arg) desc_reg_sprel(r,o,arg) |
| 1172 | #define UNW_DEC_REG_WHEN(fmt,r,t,arg) desc_reg_when(r,t,arg) |
| 1173 | #define UNW_DEC_PRIUNAT_WHEN_GR(fmt,t,arg) desc_reg_when(UNW_REG_PRI_UNAT_GR,t,arg) |
| 1174 | #define UNW_DEC_PRIUNAT_WHEN_MEM(fmt,t,arg) desc_reg_when(UNW_REG_PRI_UNAT_MEM,t,arg) |
| 1175 | #define UNW_DEC_PRIUNAT_GR(fmt,r,arg) desc_reg_gr(UNW_REG_PRI_UNAT_GR,r,arg) |
| 1176 | #define UNW_DEC_PRIUNAT_PSPREL(fmt,o,arg) desc_reg_psprel(UNW_REG_PRI_UNAT_MEM,o,arg) |
| 1177 | #define UNW_DEC_PRIUNAT_SPREL(fmt,o,arg) desc_reg_sprel(UNW_REG_PRI_UNAT_MEM,o,arg) |
| 1178 | #define UNW_DEC_RP_BR(fmt,d,arg) desc_rp_br(d,arg) |
| 1179 | #define UNW_DEC_SPILL_BASE(fmt,o,arg) desc_spill_base(o,arg) |
| 1180 | #define UNW_DEC_SPILL_MASK(fmt,m,arg) (m = desc_spill_mask(m,arg)) |
| 1181 | /* |
| 1182 | * body descriptors: |
| 1183 | */ |
| 1184 | #define UNW_DEC_EPILOGUE(fmt,t,c,arg) desc_epilogue(t,c,arg) |
| 1185 | #define UNW_DEC_COPY_STATE(fmt,l,arg) desc_copy_state(l,arg) |
| 1186 | #define UNW_DEC_LABEL_STATE(fmt,l,arg) desc_label_state(l,arg) |
| 1187 | /* |
| 1188 | * general unwind descriptors: |
| 1189 | */ |
| 1190 | #define UNW_DEC_SPILL_REG_P(f,p,t,a,x,y,arg) desc_spill_reg_p(p,t,a,x,y,arg) |
| 1191 | #define UNW_DEC_SPILL_REG(f,t,a,x,y,arg) desc_spill_reg_p(0,t,a,x,y,arg) |
| 1192 | #define UNW_DEC_SPILL_PSPREL_P(f,p,t,a,o,arg) desc_spill_psprel_p(p,t,a,o,arg) |
| 1193 | #define UNW_DEC_SPILL_PSPREL(f,t,a,o,arg) desc_spill_psprel_p(0,t,a,o,arg) |
| 1194 | #define UNW_DEC_SPILL_SPREL_P(f,p,t,a,o,arg) desc_spill_sprel_p(p,t,a,o,arg) |
| 1195 | #define UNW_DEC_SPILL_SPREL(f,t,a,o,arg) desc_spill_sprel_p(0,t,a,o,arg) |
| 1196 | #define UNW_DEC_RESTORE_P(f,p,t,a,arg) desc_restore_p(p,t,a,arg) |
| 1197 | #define UNW_DEC_RESTORE(f,t,a,arg) desc_restore_p(0,t,a,arg) |
| 1198 | |
| 1199 | #include "unwind_decoder.c" |
| 1200 | |
| 1201 | |
| 1202 | /* Unwind scripts. */ |
| 1203 | |
| 1204 | static inline unw_hash_index_t |
| 1205 | hash (unsigned long ip) |
| 1206 | { |
| 1207 | # define hashmagic 0x9e3779b97f4a7c16UL /* based on (sqrt(5)/2-1)*2^64 */ |
| 1208 | |
| 1209 | return (ip >> 4)*hashmagic >> (64 - UNW_LOG_HASH_SIZE); |
| 1210 | #undef hashmagic |
| 1211 | } |
| 1212 | |
| 1213 | static inline long |
| 1214 | cache_match (struct unw_script *script, unsigned long ip, unsigned long pr) |
| 1215 | { |
| 1216 | read_lock(&script->lock); |
| 1217 | if (ip == script->ip && ((pr ^ script->pr_val) & script->pr_mask) == 0) |
| 1218 | /* keep the read lock... */ |
| 1219 | return 1; |
| 1220 | read_unlock(&script->lock); |
| 1221 | return 0; |
| 1222 | } |
| 1223 | |
| 1224 | static inline struct unw_script * |
| 1225 | script_lookup (struct unw_frame_info *info) |
| 1226 | { |
| 1227 | struct unw_script *script = unw.cache + info->hint; |
| 1228 | unsigned short index; |
| 1229 | unsigned long ip, pr; |
| 1230 | |
| 1231 | if (UNW_DEBUG_ON(0)) |
| 1232 | return NULL; /* Always regenerate scripts in debug mode */ |
| 1233 | |
| 1234 | STAT(++unw.stat.cache.lookups); |
| 1235 | |
| 1236 | ip = info->ip; |
| 1237 | pr = info->pr; |
| 1238 | |
| 1239 | if (cache_match(script, ip, pr)) { |
| 1240 | STAT(++unw.stat.cache.hinted_hits); |
| 1241 | return script; |
| 1242 | } |
| 1243 | |
| 1244 | index = unw.hash[hash(ip)]; |
| 1245 | if (index >= UNW_CACHE_SIZE) |
| 1246 | return NULL; |
| 1247 | |
| 1248 | script = unw.cache + index; |
| 1249 | while (1) { |
| 1250 | if (cache_match(script, ip, pr)) { |
| 1251 | /* update hint; no locking required as single-word writes are atomic */ |
| 1252 | STAT(++unw.stat.cache.normal_hits); |
| 1253 | unw.cache[info->prev_script].hint = script - unw.cache; |
| 1254 | return script; |
| 1255 | } |
| 1256 | if (script->coll_chain >= UNW_HASH_SIZE) |
| 1257 | return NULL; |
| 1258 | script = unw.cache + script->coll_chain; |
| 1259 | STAT(++unw.stat.cache.collision_chain_traversals); |
| 1260 | } |
| 1261 | } |
| 1262 | |
| 1263 | /* |
| 1264 | * On returning, a write lock for the SCRIPT is still being held. |
| 1265 | */ |
| 1266 | static inline struct unw_script * |
| 1267 | script_new (unsigned long ip) |
| 1268 | { |
| 1269 | struct unw_script *script, *prev, *tmp; |
| 1270 | unw_hash_index_t index; |
| 1271 | unsigned short head; |
| 1272 | |
| 1273 | STAT(++unw.stat.script.news); |
| 1274 | |
| 1275 | /* |
| 1276 | * Can't (easily) use cmpxchg() here because of ABA problem |
| 1277 | * that is intrinsic in cmpxchg()... |
| 1278 | */ |
| 1279 | head = unw.lru_head; |
| 1280 | script = unw.cache + head; |
| 1281 | unw.lru_head = script->lru_chain; |
| 1282 | |
| 1283 | /* |
| 1284 | * We'd deadlock here if we interrupted a thread that is holding a read lock on |
| 1285 | * script->lock. Thus, if the write_trylock() fails, we simply bail out. The |
| 1286 | * alternative would be to disable interrupts whenever we hold a read-lock, but |
| 1287 | * that seems silly. |
| 1288 | */ |
| 1289 | if (!write_trylock(&script->lock)) |
| 1290 | return NULL; |
| 1291 | |
| 1292 | /* re-insert script at the tail of the LRU chain: */ |
| 1293 | unw.cache[unw.lru_tail].lru_chain = head; |
| 1294 | unw.lru_tail = head; |
| 1295 | |
| 1296 | /* remove the old script from the hash table (if it's there): */ |
| 1297 | if (script->ip) { |
| 1298 | index = hash(script->ip); |
| 1299 | tmp = unw.cache + unw.hash[index]; |
| 1300 | prev = NULL; |
| 1301 | while (1) { |
| 1302 | if (tmp == script) { |
| 1303 | if (prev) |
| 1304 | prev->coll_chain = tmp->coll_chain; |
| 1305 | else |
| 1306 | unw.hash[index] = tmp->coll_chain; |
| 1307 | break; |
| 1308 | } else |
| 1309 | prev = tmp; |
| 1310 | if (tmp->coll_chain >= UNW_CACHE_SIZE) |
| 1311 | /* old script wasn't in the hash-table */ |
| 1312 | break; |
| 1313 | tmp = unw.cache + tmp->coll_chain; |
| 1314 | } |
| 1315 | } |
| 1316 | |
| 1317 | /* enter new script in the hash table */ |
| 1318 | index = hash(ip); |
| 1319 | script->coll_chain = unw.hash[index]; |
| 1320 | unw.hash[index] = script - unw.cache; |
| 1321 | |
| 1322 | script->ip = ip; /* set new IP while we're holding the locks */ |
| 1323 | |
| 1324 | STAT(if (script->coll_chain < UNW_CACHE_SIZE) ++unw.stat.script.collisions); |
| 1325 | |
| 1326 | script->flags = 0; |
| 1327 | script->hint = 0; |
| 1328 | script->count = 0; |
| 1329 | return script; |
| 1330 | } |
| 1331 | |
| 1332 | static void |
| 1333 | script_finalize (struct unw_script *script, struct unw_state_record *sr) |
| 1334 | { |
| 1335 | script->pr_mask = sr->pr_mask; |
| 1336 | script->pr_val = sr->pr_val; |
| 1337 | /* |
| 1338 | * We could down-grade our write-lock on script->lock here but |
| 1339 | * the rwlock API doesn't offer atomic lock downgrading, so |
| 1340 | * we'll just keep the write-lock and release it later when |
| 1341 | * we're done using the script. |
| 1342 | */ |
| 1343 | } |
| 1344 | |
| 1345 | static inline void |
| 1346 | script_emit (struct unw_script *script, struct unw_insn insn) |
| 1347 | { |
| 1348 | if (script->count >= UNW_MAX_SCRIPT_LEN) { |
| 1349 | UNW_DPRINT(0, "unwind.%s: script exceeds maximum size of %u instructions!\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1350 | __func__, UNW_MAX_SCRIPT_LEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | return; |
| 1352 | } |
| 1353 | script->insn[script->count++] = insn; |
| 1354 | } |
| 1355 | |
| 1356 | static inline void |
| 1357 | emit_nat_info (struct unw_state_record *sr, int i, struct unw_script *script) |
| 1358 | { |
| 1359 | struct unw_reg_info *r = sr->curr.reg + i; |
| 1360 | enum unw_insn_opcode opc; |
| 1361 | struct unw_insn insn; |
| 1362 | unsigned long val = 0; |
| 1363 | |
| 1364 | switch (r->where) { |
| 1365 | case UNW_WHERE_GR: |
| 1366 | if (r->val >= 32) { |
| 1367 | /* register got spilled to a stacked register */ |
| 1368 | opc = UNW_INSN_SETNAT_TYPE; |
| 1369 | val = UNW_NAT_REGSTK; |
| 1370 | } else |
| 1371 | /* register got spilled to a scratch register */ |
| 1372 | opc = UNW_INSN_SETNAT_MEMSTK; |
| 1373 | break; |
| 1374 | |
| 1375 | case UNW_WHERE_FR: |
| 1376 | opc = UNW_INSN_SETNAT_TYPE; |
| 1377 | val = UNW_NAT_VAL; |
| 1378 | break; |
| 1379 | |
| 1380 | case UNW_WHERE_BR: |
| 1381 | opc = UNW_INSN_SETNAT_TYPE; |
| 1382 | val = UNW_NAT_NONE; |
| 1383 | break; |
| 1384 | |
| 1385 | case UNW_WHERE_PSPREL: |
| 1386 | case UNW_WHERE_SPREL: |
| 1387 | opc = UNW_INSN_SETNAT_MEMSTK; |
| 1388 | break; |
| 1389 | |
| 1390 | default: |
| 1391 | UNW_DPRINT(0, "unwind.%s: don't know how to emit nat info for where = %u\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1392 | __func__, r->where); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | return; |
| 1394 | } |
| 1395 | insn.opc = opc; |
| 1396 | insn.dst = unw.preg_index[i]; |
| 1397 | insn.val = val; |
| 1398 | script_emit(script, insn); |
| 1399 | } |
| 1400 | |
| 1401 | static void |
| 1402 | compile_reg (struct unw_state_record *sr, int i, struct unw_script *script) |
| 1403 | { |
| 1404 | struct unw_reg_info *r = sr->curr.reg + i; |
| 1405 | enum unw_insn_opcode opc; |
| 1406 | unsigned long val, rval; |
| 1407 | struct unw_insn insn; |
| 1408 | long need_nat_info; |
| 1409 | |
| 1410 | if (r->where == UNW_WHERE_NONE || r->when >= sr->when_target) |
| 1411 | return; |
| 1412 | |
| 1413 | opc = UNW_INSN_MOVE; |
| 1414 | val = rval = r->val; |
| 1415 | need_nat_info = (i >= UNW_REG_R4 && i <= UNW_REG_R7); |
| 1416 | |
| 1417 | switch (r->where) { |
| 1418 | case UNW_WHERE_GR: |
| 1419 | if (rval >= 32) { |
| 1420 | opc = UNW_INSN_MOVE_STACKED; |
| 1421 | val = rval - 32; |
| 1422 | } else if (rval >= 4 && rval <= 7) { |
| 1423 | if (need_nat_info) { |
| 1424 | opc = UNW_INSN_MOVE2; |
| 1425 | need_nat_info = 0; |
| 1426 | } |
| 1427 | val = unw.preg_index[UNW_REG_R4 + (rval - 4)]; |
| 1428 | } else if (rval == 0) { |
| 1429 | opc = UNW_INSN_MOVE_CONST; |
| 1430 | val = 0; |
| 1431 | } else { |
| 1432 | /* register got spilled to a scratch register */ |
| 1433 | opc = UNW_INSN_MOVE_SCRATCH; |
| 1434 | val = pt_regs_off(rval); |
| 1435 | } |
| 1436 | break; |
| 1437 | |
| 1438 | case UNW_WHERE_FR: |
| 1439 | if (rval <= 5) |
| 1440 | val = unw.preg_index[UNW_REG_F2 + (rval - 2)]; |
| 1441 | else if (rval >= 16 && rval <= 31) |
| 1442 | val = unw.preg_index[UNW_REG_F16 + (rval - 16)]; |
| 1443 | else { |
| 1444 | opc = UNW_INSN_MOVE_SCRATCH; |
| 1445 | if (rval <= 11) |
| 1446 | val = offsetof(struct pt_regs, f6) + 16*(rval - 6); |
| 1447 | else |
| 1448 | UNW_DPRINT(0, "unwind.%s: kernel may not touch f%lu\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1449 | __func__, rval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | } |
| 1451 | break; |
| 1452 | |
| 1453 | case UNW_WHERE_BR: |
| 1454 | if (rval >= 1 && rval <= 5) |
| 1455 | val = unw.preg_index[UNW_REG_B1 + (rval - 1)]; |
| 1456 | else { |
| 1457 | opc = UNW_INSN_MOVE_SCRATCH; |
| 1458 | if (rval == 0) |
| 1459 | val = offsetof(struct pt_regs, b0); |
| 1460 | else if (rval == 6) |
| 1461 | val = offsetof(struct pt_regs, b6); |
| 1462 | else |
| 1463 | val = offsetof(struct pt_regs, b7); |
| 1464 | } |
| 1465 | break; |
| 1466 | |
| 1467 | case UNW_WHERE_SPREL: |
| 1468 | opc = UNW_INSN_ADD_SP; |
| 1469 | break; |
| 1470 | |
| 1471 | case UNW_WHERE_PSPREL: |
| 1472 | opc = UNW_INSN_ADD_PSP; |
| 1473 | break; |
| 1474 | |
| 1475 | default: |
| 1476 | UNW_DPRINT(0, "unwind%s: register %u has unexpected `where' value of %u\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1477 | __func__, i, r->where); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | break; |
| 1479 | } |
| 1480 | insn.opc = opc; |
| 1481 | insn.dst = unw.preg_index[i]; |
| 1482 | insn.val = val; |
| 1483 | script_emit(script, insn); |
| 1484 | if (need_nat_info) |
| 1485 | emit_nat_info(sr, i, script); |
| 1486 | |
| 1487 | if (i == UNW_REG_PSP) { |
| 1488 | /* |
| 1489 | * info->psp must contain the _value_ of the previous |
| 1490 | * sp, not it's save location. We get this by |
| 1491 | * dereferencing the value we just stored in |
| 1492 | * info->psp: |
| 1493 | */ |
| 1494 | insn.opc = UNW_INSN_LOAD; |
| 1495 | insn.dst = insn.val = unw.preg_index[UNW_REG_PSP]; |
| 1496 | script_emit(script, insn); |
| 1497 | } |
| 1498 | } |
| 1499 | |
| 1500 | static inline const struct unw_table_entry * |
| 1501 | lookup (struct unw_table *table, unsigned long rel_ip) |
| 1502 | { |
| 1503 | const struct unw_table_entry *e = NULL; |
| 1504 | unsigned long lo, hi, mid; |
| 1505 | |
| 1506 | /* do a binary search for right entry: */ |
| 1507 | for (lo = 0, hi = table->length; lo < hi; ) { |
| 1508 | mid = (lo + hi) / 2; |
| 1509 | e = &table->array[mid]; |
| 1510 | if (rel_ip < e->start_offset) |
| 1511 | hi = mid; |
| 1512 | else if (rel_ip >= e->end_offset) |
| 1513 | lo = mid + 1; |
| 1514 | else |
| 1515 | break; |
| 1516 | } |
| 1517 | if (rel_ip < e->start_offset || rel_ip >= e->end_offset) |
| 1518 | return NULL; |
| 1519 | return e; |
| 1520 | } |
| 1521 | |
| 1522 | /* |
| 1523 | * Build an unwind script that unwinds from state OLD_STATE to the |
| 1524 | * entrypoint of the function that called OLD_STATE. |
| 1525 | */ |
| 1526 | static inline struct unw_script * |
| 1527 | build_script (struct unw_frame_info *info) |
| 1528 | { |
| 1529 | const struct unw_table_entry *e = NULL; |
| 1530 | struct unw_script *script = NULL; |
| 1531 | struct unw_labeled_state *ls, *next; |
| 1532 | unsigned long ip = info->ip; |
| 1533 | struct unw_state_record sr; |
| 1534 | struct unw_table *table; |
| 1535 | struct unw_reg_info *r; |
| 1536 | struct unw_insn insn; |
| 1537 | u8 *dp, *desc_end; |
| 1538 | u64 hdr; |
| 1539 | int i; |
| 1540 | STAT(unsigned long start, parse_start;) |
| 1541 | |
| 1542 | STAT(++unw.stat.script.builds; start = ia64_get_itc()); |
| 1543 | |
| 1544 | /* build state record */ |
| 1545 | memset(&sr, 0, sizeof(sr)); |
| 1546 | for (r = sr.curr.reg; r < sr.curr.reg + UNW_NUM_REGS; ++r) |
| 1547 | r->when = UNW_WHEN_NEVER; |
| 1548 | sr.pr_val = info->pr; |
| 1549 | |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1550 | UNW_DPRINT(3, "unwind.%s: ip 0x%lx\n", __func__, ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | script = script_new(ip); |
| 1552 | if (!script) { |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1553 | UNW_DPRINT(0, "unwind.%s: failed to create unwind script\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | STAT(unw.stat.script.build_time += ia64_get_itc() - start); |
| 1555 | return NULL; |
| 1556 | } |
| 1557 | unw.cache[info->prev_script].hint = script - unw.cache; |
| 1558 | |
| 1559 | /* search the kernels and the modules' unwind tables for IP: */ |
| 1560 | |
| 1561 | STAT(parse_start = ia64_get_itc()); |
| 1562 | |
| 1563 | for (table = unw.tables; table; table = table->next) { |
| 1564 | if (ip >= table->start && ip < table->end) { |
| 1565 | e = lookup(table, ip - table->segment_base); |
| 1566 | break; |
| 1567 | } |
| 1568 | } |
| 1569 | if (!e) { |
| 1570 | /* no info, return default unwinder (leaf proc, no mem stack, no saved regs) */ |
| 1571 | UNW_DPRINT(1, "unwind.%s: no unwind info for ip=0x%lx (prev ip=0x%lx)\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1572 | __func__, ip, unw.cache[info->prev_script].ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | sr.curr.reg[UNW_REG_RP].where = UNW_WHERE_BR; |
| 1574 | sr.curr.reg[UNW_REG_RP].when = -1; |
| 1575 | sr.curr.reg[UNW_REG_RP].val = 0; |
| 1576 | compile_reg(&sr, UNW_REG_RP, script); |
| 1577 | script_finalize(script, &sr); |
| 1578 | STAT(unw.stat.script.parse_time += ia64_get_itc() - parse_start); |
| 1579 | STAT(unw.stat.script.build_time += ia64_get_itc() - start); |
| 1580 | return script; |
| 1581 | } |
| 1582 | |
| 1583 | sr.when_target = (3*((ip & ~0xfUL) - (table->segment_base + e->start_offset))/16 |
| 1584 | + (ip & 0xfUL)); |
| 1585 | hdr = *(u64 *) (table->segment_base + e->info_offset); |
| 1586 | dp = (u8 *) (table->segment_base + e->info_offset + 8); |
| 1587 | desc_end = dp + 8*UNW_LENGTH(hdr); |
| 1588 | |
| 1589 | while (!sr.done && dp < desc_end) |
| 1590 | dp = unw_decode(dp, sr.in_body, &sr); |
| 1591 | |
| 1592 | if (sr.when_target > sr.epilogue_start) { |
| 1593 | /* |
| 1594 | * sp has been restored and all values on the memory stack below |
| 1595 | * psp also have been restored. |
| 1596 | */ |
| 1597 | sr.curr.reg[UNW_REG_PSP].val = 0; |
| 1598 | sr.curr.reg[UNW_REG_PSP].where = UNW_WHERE_NONE; |
| 1599 | sr.curr.reg[UNW_REG_PSP].when = UNW_WHEN_NEVER; |
| 1600 | for (r = sr.curr.reg; r < sr.curr.reg + UNW_NUM_REGS; ++r) |
| 1601 | if ((r->where == UNW_WHERE_PSPREL && r->val <= 0x10) |
| 1602 | || r->where == UNW_WHERE_SPREL) |
| 1603 | { |
| 1604 | r->val = 0; |
| 1605 | r->where = UNW_WHERE_NONE; |
| 1606 | r->when = UNW_WHEN_NEVER; |
| 1607 | } |
| 1608 | } |
| 1609 | |
| 1610 | script->flags = sr.flags; |
| 1611 | |
| 1612 | /* |
| 1613 | * If RP did't get saved, generate entry for the return link |
| 1614 | * register. |
| 1615 | */ |
| 1616 | if (sr.curr.reg[UNW_REG_RP].when >= sr.when_target) { |
| 1617 | sr.curr.reg[UNW_REG_RP].where = UNW_WHERE_BR; |
| 1618 | sr.curr.reg[UNW_REG_RP].when = -1; |
| 1619 | sr.curr.reg[UNW_REG_RP].val = sr.return_link_reg; |
| 1620 | UNW_DPRINT(1, "unwind.%s: using default for rp at ip=0x%lx where=%d val=0x%lx\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1621 | __func__, ip, sr.curr.reg[UNW_REG_RP].where, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1622 | sr.curr.reg[UNW_REG_RP].val); |
| 1623 | } |
| 1624 | |
| 1625 | #ifdef UNW_DEBUG |
| 1626 | UNW_DPRINT(1, "unwind.%s: state record for func 0x%lx, t=%u:\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1627 | __func__, table->segment_base + e->start_offset, sr.when_target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | for (r = sr.curr.reg; r < sr.curr.reg + UNW_NUM_REGS; ++r) { |
| 1629 | if (r->where != UNW_WHERE_NONE || r->when != UNW_WHEN_NEVER) { |
| 1630 | UNW_DPRINT(1, " %s <- ", unw.preg_name[r - sr.curr.reg]); |
| 1631 | switch (r->where) { |
| 1632 | case UNW_WHERE_GR: UNW_DPRINT(1, "r%lu", r->val); break; |
| 1633 | case UNW_WHERE_FR: UNW_DPRINT(1, "f%lu", r->val); break; |
| 1634 | case UNW_WHERE_BR: UNW_DPRINT(1, "b%lu", r->val); break; |
| 1635 | case UNW_WHERE_SPREL: UNW_DPRINT(1, "[sp+0x%lx]", r->val); break; |
| 1636 | case UNW_WHERE_PSPREL: UNW_DPRINT(1, "[psp+0x%lx]", r->val); break; |
| 1637 | case UNW_WHERE_NONE: |
| 1638 | UNW_DPRINT(1, "%s+0x%lx", unw.preg_name[r - sr.curr.reg], r->val); |
| 1639 | break; |
| 1640 | |
| 1641 | default: |
| 1642 | UNW_DPRINT(1, "BADWHERE(%d)", r->where); |
| 1643 | break; |
| 1644 | } |
| 1645 | UNW_DPRINT(1, "\t\t%d\n", r->when); |
| 1646 | } |
| 1647 | } |
| 1648 | #endif |
| 1649 | |
| 1650 | STAT(unw.stat.script.parse_time += ia64_get_itc() - parse_start); |
| 1651 | |
| 1652 | /* translate state record into unwinder instructions: */ |
| 1653 | |
| 1654 | /* |
| 1655 | * First, set psp if we're dealing with a fixed-size frame; |
| 1656 | * subsequent instructions may depend on this value. |
| 1657 | */ |
| 1658 | if (sr.when_target > sr.curr.reg[UNW_REG_PSP].when |
| 1659 | && (sr.curr.reg[UNW_REG_PSP].where == UNW_WHERE_NONE) |
| 1660 | && sr.curr.reg[UNW_REG_PSP].val != 0) { |
| 1661 | /* new psp is sp plus frame size */ |
| 1662 | insn.opc = UNW_INSN_ADD; |
| 1663 | insn.dst = offsetof(struct unw_frame_info, psp)/8; |
| 1664 | insn.val = sr.curr.reg[UNW_REG_PSP].val; /* frame size */ |
| 1665 | script_emit(script, insn); |
| 1666 | } |
| 1667 | |
| 1668 | /* determine where the primary UNaT is: */ |
| 1669 | if (sr.when_target < sr.curr.reg[UNW_REG_PRI_UNAT_GR].when) |
| 1670 | i = UNW_REG_PRI_UNAT_MEM; |
| 1671 | else if (sr.when_target < sr.curr.reg[UNW_REG_PRI_UNAT_MEM].when) |
| 1672 | i = UNW_REG_PRI_UNAT_GR; |
| 1673 | else if (sr.curr.reg[UNW_REG_PRI_UNAT_MEM].when > sr.curr.reg[UNW_REG_PRI_UNAT_GR].when) |
| 1674 | i = UNW_REG_PRI_UNAT_MEM; |
| 1675 | else |
| 1676 | i = UNW_REG_PRI_UNAT_GR; |
| 1677 | |
| 1678 | compile_reg(&sr, i, script); |
| 1679 | |
| 1680 | for (i = UNW_REG_BSP; i < UNW_NUM_REGS; ++i) |
| 1681 | compile_reg(&sr, i, script); |
| 1682 | |
| 1683 | /* free labeled register states & stack: */ |
| 1684 | |
| 1685 | STAT(parse_start = ia64_get_itc()); |
| 1686 | for (ls = sr.labeled_states; ls; ls = next) { |
| 1687 | next = ls->next; |
| 1688 | free_state_stack(&ls->saved_state); |
| 1689 | free_labeled_state(ls); |
| 1690 | } |
| 1691 | free_state_stack(&sr.curr); |
| 1692 | STAT(unw.stat.script.parse_time += ia64_get_itc() - parse_start); |
| 1693 | |
| 1694 | script_finalize(script, &sr); |
| 1695 | STAT(unw.stat.script.build_time += ia64_get_itc() - start); |
| 1696 | return script; |
| 1697 | } |
| 1698 | |
| 1699 | /* |
| 1700 | * Apply the unwinding actions represented by OPS and update SR to |
| 1701 | * reflect the state that existed upon entry to the function that this |
| 1702 | * unwinder represents. |
| 1703 | */ |
| 1704 | static inline void |
| 1705 | run_script (struct unw_script *script, struct unw_frame_info *state) |
| 1706 | { |
| 1707 | struct unw_insn *ip, *limit, next_insn; |
| 1708 | unsigned long opc, dst, val, off; |
| 1709 | unsigned long *s = (unsigned long *) state; |
| 1710 | STAT(unsigned long start;) |
| 1711 | |
| 1712 | STAT(++unw.stat.script.runs; start = ia64_get_itc()); |
| 1713 | state->flags = script->flags; |
| 1714 | ip = script->insn; |
| 1715 | limit = script->insn + script->count; |
| 1716 | next_insn = *ip; |
| 1717 | |
| 1718 | while (ip++ < limit) { |
| 1719 | opc = next_insn.opc; |
| 1720 | dst = next_insn.dst; |
| 1721 | val = next_insn.val; |
| 1722 | next_insn = *ip; |
| 1723 | |
| 1724 | redo: |
| 1725 | switch (opc) { |
| 1726 | case UNW_INSN_ADD: |
| 1727 | s[dst] += val; |
| 1728 | break; |
| 1729 | |
| 1730 | case UNW_INSN_MOVE2: |
| 1731 | if (!s[val]) |
| 1732 | goto lazy_init; |
| 1733 | s[dst+1] = s[val+1]; |
| 1734 | s[dst] = s[val]; |
| 1735 | break; |
| 1736 | |
| 1737 | case UNW_INSN_MOVE: |
| 1738 | if (!s[val]) |
| 1739 | goto lazy_init; |
| 1740 | s[dst] = s[val]; |
| 1741 | break; |
| 1742 | |
| 1743 | case UNW_INSN_MOVE_SCRATCH: |
| 1744 | if (state->pt) { |
| 1745 | s[dst] = (unsigned long) get_scratch_regs(state) + val; |
| 1746 | } else { |
| 1747 | s[dst] = 0; |
| 1748 | UNW_DPRINT(0, "unwind.%s: no state->pt, dst=%ld, val=%ld\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1749 | __func__, dst, val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1750 | } |
| 1751 | break; |
| 1752 | |
| 1753 | case UNW_INSN_MOVE_CONST: |
| 1754 | if (val == 0) |
| 1755 | s[dst] = (unsigned long) &unw.r0; |
| 1756 | else { |
| 1757 | s[dst] = 0; |
| 1758 | UNW_DPRINT(0, "unwind.%s: UNW_INSN_MOVE_CONST bad val=%ld\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1759 | __func__, val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1760 | } |
| 1761 | break; |
| 1762 | |
| 1763 | |
| 1764 | case UNW_INSN_MOVE_STACKED: |
| 1765 | s[dst] = (unsigned long) ia64_rse_skip_regs((unsigned long *)state->bsp, |
| 1766 | val); |
| 1767 | break; |
| 1768 | |
| 1769 | case UNW_INSN_ADD_PSP: |
| 1770 | s[dst] = state->psp + val; |
| 1771 | break; |
| 1772 | |
| 1773 | case UNW_INSN_ADD_SP: |
| 1774 | s[dst] = state->sp + val; |
| 1775 | break; |
| 1776 | |
| 1777 | case UNW_INSN_SETNAT_MEMSTK: |
| 1778 | if (!state->pri_unat_loc) |
Keith Owens | b833961 | 2005-07-21 23:41:00 -0700 | [diff] [blame] | 1779 | state->pri_unat_loc = &state->sw->caller_unat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | /* register off. is a multiple of 8, so the least 3 bits (type) are 0 */ |
| 1781 | s[dst+1] = ((unsigned long) state->pri_unat_loc - s[dst]) | UNW_NAT_MEMSTK; |
| 1782 | break; |
| 1783 | |
| 1784 | case UNW_INSN_SETNAT_TYPE: |
| 1785 | s[dst+1] = val; |
| 1786 | break; |
| 1787 | |
| 1788 | case UNW_INSN_LOAD: |
| 1789 | #ifdef UNW_DEBUG |
| 1790 | if ((s[val] & (local_cpu_data->unimpl_va_mask | 0x7)) != 0 |
| 1791 | || s[val] < TASK_SIZE) |
| 1792 | { |
| 1793 | UNW_DPRINT(0, "unwind.%s: rejecting bad psp=0x%lx\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1794 | __func__, s[val]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1795 | break; |
| 1796 | } |
| 1797 | #endif |
| 1798 | s[dst] = *(unsigned long *) s[val]; |
| 1799 | break; |
| 1800 | } |
| 1801 | } |
| 1802 | STAT(unw.stat.script.run_time += ia64_get_itc() - start); |
| 1803 | return; |
| 1804 | |
| 1805 | lazy_init: |
| 1806 | off = unw.sw_off[val]; |
| 1807 | s[val] = (unsigned long) state->sw + off; |
| 1808 | if (off >= offsetof(struct switch_stack, r4) && off <= offsetof(struct switch_stack, r7)) |
| 1809 | /* |
| 1810 | * We're initializing a general register: init NaT info, too. Note that |
| 1811 | * the offset is a multiple of 8 which gives us the 3 bits needed for |
| 1812 | * the type field. |
| 1813 | */ |
| 1814 | s[val+1] = (offsetof(struct switch_stack, ar_unat) - off) | UNW_NAT_MEMSTK; |
| 1815 | goto redo; |
| 1816 | } |
| 1817 | |
| 1818 | static int |
| 1819 | find_save_locs (struct unw_frame_info *info) |
| 1820 | { |
| 1821 | int have_write_lock = 0; |
| 1822 | struct unw_script *scr; |
| 1823 | unsigned long flags = 0; |
| 1824 | |
| 1825 | if ((info->ip & (local_cpu_data->unimpl_va_mask | 0xf)) || info->ip < TASK_SIZE) { |
| 1826 | /* don't let obviously bad addresses pollute the cache */ |
| 1827 | /* FIXME: should really be level 0 but it occurs too often. KAO */ |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1828 | UNW_DPRINT(1, "unwind.%s: rejecting bad ip=0x%lx\n", __func__, info->ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1829 | info->rp_loc = NULL; |
| 1830 | return -1; |
| 1831 | } |
| 1832 | |
| 1833 | scr = script_lookup(info); |
| 1834 | if (!scr) { |
| 1835 | spin_lock_irqsave(&unw.lock, flags); |
| 1836 | scr = build_script(info); |
| 1837 | if (!scr) { |
| 1838 | spin_unlock_irqrestore(&unw.lock, flags); |
| 1839 | UNW_DPRINT(0, |
| 1840 | "unwind.%s: failed to locate/build unwind script for ip %lx\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1841 | __func__, info->ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | return -1; |
| 1843 | } |
| 1844 | have_write_lock = 1; |
| 1845 | } |
| 1846 | info->hint = scr->hint; |
| 1847 | info->prev_script = scr - unw.cache; |
| 1848 | |
| 1849 | run_script(scr, info); |
| 1850 | |
| 1851 | if (have_write_lock) { |
| 1852 | write_unlock(&scr->lock); |
| 1853 | spin_unlock_irqrestore(&unw.lock, flags); |
| 1854 | } else |
| 1855 | read_unlock(&scr->lock); |
| 1856 | return 0; |
| 1857 | } |
| 1858 | |
Keith Owens | 66fa9b1 | 2007-06-26 16:25:22 +1000 | [diff] [blame] | 1859 | static int |
| 1860 | unw_valid(const struct unw_frame_info *info, unsigned long* p) |
| 1861 | { |
| 1862 | unsigned long loc = (unsigned long)p; |
| 1863 | return (loc >= info->regstk.limit && loc < info->regstk.top) || |
| 1864 | (loc >= info->memstk.top && loc < info->memstk.limit); |
| 1865 | } |
| 1866 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1867 | int |
| 1868 | unw_unwind (struct unw_frame_info *info) |
| 1869 | { |
| 1870 | unsigned long prev_ip, prev_sp, prev_bsp; |
Keith Owens | 66fa9b1 | 2007-06-26 16:25:22 +1000 | [diff] [blame] | 1871 | unsigned long ip, pr, num_regs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | STAT(unsigned long start, flags;) |
| 1873 | int retval; |
| 1874 | |
| 1875 | STAT(local_irq_save(flags); ++unw.stat.api.unwinds; start = ia64_get_itc()); |
| 1876 | |
| 1877 | prev_ip = info->ip; |
| 1878 | prev_sp = info->sp; |
| 1879 | prev_bsp = info->bsp; |
| 1880 | |
Robin Holt | e2e6fe7 | 2007-05-18 13:46:23 -0500 | [diff] [blame] | 1881 | /* validate the return IP pointer */ |
Keith Owens | 66fa9b1 | 2007-06-26 16:25:22 +1000 | [diff] [blame] | 1882 | if (!unw_valid(info, info->rp_loc)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1883 | /* FIXME: should really be level 0 but it occurs too often. KAO */ |
| 1884 | UNW_DPRINT(1, "unwind.%s: failed to locate return link (ip=0x%lx)!\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1885 | __func__, info->ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags)); |
| 1887 | return -1; |
| 1888 | } |
Robin Holt | e2e6fe7 | 2007-05-18 13:46:23 -0500 | [diff] [blame] | 1889 | /* restore the ip */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | ip = info->ip = *info->rp_loc; |
| 1891 | if (ip < GATE_ADDR) { |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1892 | UNW_DPRINT(2, "unwind.%s: reached user-space (ip=0x%lx)\n", __func__, ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1893 | STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags)); |
| 1894 | return -1; |
| 1895 | } |
| 1896 | |
Robin Holt | e2e6fe7 | 2007-05-18 13:46:23 -0500 | [diff] [blame] | 1897 | /* validate the previous stack frame pointer */ |
Keith Owens | 66fa9b1 | 2007-06-26 16:25:22 +1000 | [diff] [blame] | 1898 | if (!unw_valid(info, info->pfs_loc)) { |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1899 | UNW_DPRINT(0, "unwind.%s: failed to locate ar.pfs!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1900 | STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags)); |
| 1901 | return -1; |
| 1902 | } |
Robin Holt | e2e6fe7 | 2007-05-18 13:46:23 -0500 | [diff] [blame] | 1903 | /* restore the cfm: */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | info->cfm_loc = info->pfs_loc; |
| 1905 | |
| 1906 | /* restore the bsp: */ |
| 1907 | pr = info->pr; |
| 1908 | num_regs = 0; |
| 1909 | if ((info->flags & UNW_FLAG_INTERRUPT_FRAME)) { |
| 1910 | info->pt = info->sp + 16; |
| 1911 | if ((pr & (1UL << PRED_NON_SYSCALL)) != 0) |
| 1912 | num_regs = *info->cfm_loc & 0x7f; /* size of frame */ |
| 1913 | info->pfs_loc = |
| 1914 | (unsigned long *) (info->pt + offsetof(struct pt_regs, ar_pfs)); |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1915 | UNW_DPRINT(3, "unwind.%s: interrupt_frame pt 0x%lx\n", __func__, info->pt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | } else |
| 1917 | num_regs = (*info->cfm_loc >> 7) & 0x7f; /* size of locals */ |
| 1918 | info->bsp = (unsigned long) ia64_rse_skip_regs((unsigned long *) info->bsp, -num_regs); |
| 1919 | if (info->bsp < info->regstk.limit || info->bsp > info->regstk.top) { |
| 1920 | UNW_DPRINT(0, "unwind.%s: bsp (0x%lx) out of range [0x%lx-0x%lx]\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1921 | __func__, info->bsp, info->regstk.limit, info->regstk.top); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1922 | STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags)); |
| 1923 | return -1; |
| 1924 | } |
| 1925 | |
| 1926 | /* restore the sp: */ |
| 1927 | info->sp = info->psp; |
| 1928 | if (info->sp < info->memstk.top || info->sp > info->memstk.limit) { |
| 1929 | UNW_DPRINT(0, "unwind.%s: sp (0x%lx) out of range [0x%lx-0x%lx]\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1930 | __func__, info->sp, info->memstk.top, info->memstk.limit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1931 | STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags)); |
| 1932 | return -1; |
| 1933 | } |
| 1934 | |
| 1935 | if (info->ip == prev_ip && info->sp == prev_sp && info->bsp == prev_bsp) { |
| 1936 | UNW_DPRINT(0, "unwind.%s: ip, sp, bsp unchanged; stopping here (ip=0x%lx)\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1937 | __func__, ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags)); |
| 1939 | return -1; |
| 1940 | } |
| 1941 | |
| 1942 | /* as we unwind, the saved ar.unat becomes the primary unat: */ |
| 1943 | info->pri_unat_loc = info->unat_loc; |
| 1944 | |
| 1945 | /* finally, restore the predicates: */ |
| 1946 | unw_get_pr(info, &info->pr); |
| 1947 | |
| 1948 | retval = find_save_locs(info); |
| 1949 | STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags)); |
| 1950 | return retval; |
| 1951 | } |
| 1952 | EXPORT_SYMBOL(unw_unwind); |
| 1953 | |
| 1954 | int |
| 1955 | unw_unwind_to_user (struct unw_frame_info *info) |
| 1956 | { |
Kirill Korotaev | 690def2 | 2007-03-19 14:04:20 +0300 | [diff] [blame] | 1957 | unsigned long ip, sp, pr = info->pr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1958 | |
Kirill Korotaev | 690def2 | 2007-03-19 14:04:20 +0300 | [diff] [blame] | 1959 | do { |
Keith Owens | e8d1cb2 | 2005-04-25 11:45:26 -0700 | [diff] [blame] | 1960 | unw_get_sp(info, &sp); |
| 1961 | if ((long)((unsigned long)info->task + IA64_STK_OFFSET - sp) |
| 1962 | < IA64_PT_REGS_SIZE) { |
| 1963 | UNW_DPRINT(0, "unwind.%s: ran off the top of the kernel stack\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1964 | __func__); |
Keith Owens | e8d1cb2 | 2005-04-25 11:45:26 -0700 | [diff] [blame] | 1965 | break; |
| 1966 | } |
| 1967 | if (unw_is_intr_frame(info) && |
| 1968 | (pr & (1UL << PRED_USER_STACK))) |
| 1969 | return 0; |
| 1970 | if (unw_get_pr (info, &pr) < 0) { |
| 1971 | unw_get_rp(info, &ip); |
| 1972 | UNW_DPRINT(0, "unwind.%s: failed to read " |
| 1973 | "predicate register (ip=0x%lx)\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1974 | __func__, ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1975 | return -1; |
| 1976 | } |
Kirill Korotaev | 690def2 | 2007-03-19 14:04:20 +0300 | [diff] [blame] | 1977 | } while (unw_unwind(info) >= 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1978 | unw_get_ip(info, &ip); |
Keith Owens | e8d1cb2 | 2005-04-25 11:45:26 -0700 | [diff] [blame] | 1979 | UNW_DPRINT(0, "unwind.%s: failed to unwind to user-level (ip=0x%lx)\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 1980 | __func__, ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1981 | return -1; |
| 1982 | } |
| 1983 | EXPORT_SYMBOL(unw_unwind_to_user); |
| 1984 | |
| 1985 | static void |
| 1986 | init_frame_info (struct unw_frame_info *info, struct task_struct *t, |
| 1987 | struct switch_stack *sw, unsigned long stktop) |
| 1988 | { |
| 1989 | unsigned long rbslimit, rbstop, stklimit; |
| 1990 | STAT(unsigned long start, flags;) |
| 1991 | |
| 1992 | STAT(local_irq_save(flags); ++unw.stat.api.inits; start = ia64_get_itc()); |
| 1993 | |
| 1994 | /* |
| 1995 | * Subtle stuff here: we _could_ unwind through the switch_stack frame but we |
| 1996 | * don't want to do that because it would be slow as each preserved register would |
| 1997 | * have to be processed. Instead, what we do here is zero out the frame info and |
| 1998 | * start the unwind process at the function that created the switch_stack frame. |
| 1999 | * When a preserved value in switch_stack needs to be accessed, run_script() will |
| 2000 | * initialize the appropriate pointer on demand. |
| 2001 | */ |
| 2002 | memset(info, 0, sizeof(*info)); |
| 2003 | |
| 2004 | rbslimit = (unsigned long) t + IA64_RBS_OFFSET; |
Robin Holt | e2e6fe7 | 2007-05-18 13:46:23 -0500 | [diff] [blame] | 2005 | stklimit = (unsigned long) t + IA64_STK_OFFSET; |
| 2006 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2007 | rbstop = sw->ar_bspstore; |
Robin Holt | e2e6fe7 | 2007-05-18 13:46:23 -0500 | [diff] [blame] | 2008 | if (rbstop > stklimit || rbstop < rbslimit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2009 | rbstop = rbslimit; |
| 2010 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2011 | if (stktop <= rbstop) |
| 2012 | stktop = rbstop; |
Robin Holt | e2e6fe7 | 2007-05-18 13:46:23 -0500 | [diff] [blame] | 2013 | if (stktop > stklimit) |
| 2014 | stktop = stklimit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2015 | |
| 2016 | info->regstk.limit = rbslimit; |
| 2017 | info->regstk.top = rbstop; |
| 2018 | info->memstk.limit = stklimit; |
| 2019 | info->memstk.top = stktop; |
| 2020 | info->task = t; |
| 2021 | info->sw = sw; |
| 2022 | info->sp = info->psp = stktop; |
| 2023 | info->pr = sw->pr; |
| 2024 | UNW_DPRINT(3, "unwind.%s:\n" |
| 2025 | " task 0x%lx\n" |
| 2026 | " rbs = [0x%lx-0x%lx)\n" |
| 2027 | " stk = [0x%lx-0x%lx)\n" |
| 2028 | " pr 0x%lx\n" |
| 2029 | " sw 0x%lx\n" |
| 2030 | " sp 0x%lx\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 2031 | __func__, (unsigned long) t, rbslimit, rbstop, stktop, stklimit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2032 | info->pr, (unsigned long) info->sw, info->sp); |
| 2033 | STAT(unw.stat.api.init_time += ia64_get_itc() - start; local_irq_restore(flags)); |
| 2034 | } |
| 2035 | |
| 2036 | void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | unw_init_frame_info (struct unw_frame_info *info, struct task_struct *t, struct switch_stack *sw) |
| 2038 | { |
| 2039 | unsigned long sol; |
| 2040 | |
| 2041 | init_frame_info(info, t, sw, (unsigned long) (sw + 1) - 16); |
| 2042 | info->cfm_loc = &sw->ar_pfs; |
| 2043 | sol = (*info->cfm_loc >> 7) & 0x7f; |
| 2044 | info->bsp = (unsigned long) ia64_rse_skip_regs((unsigned long *) info->regstk.top, -sol); |
| 2045 | info->ip = sw->b0; |
| 2046 | UNW_DPRINT(3, "unwind.%s:\n" |
| 2047 | " bsp 0x%lx\n" |
| 2048 | " sol 0x%lx\n" |
| 2049 | " ip 0x%lx\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 2050 | __func__, info->bsp, sol, info->ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2051 | find_save_locs(info); |
| 2052 | } |
| 2053 | |
| 2054 | EXPORT_SYMBOL(unw_init_frame_info); |
| 2055 | |
| 2056 | void |
| 2057 | unw_init_from_blocked_task (struct unw_frame_info *info, struct task_struct *t) |
| 2058 | { |
| 2059 | struct switch_stack *sw = (struct switch_stack *) (t->thread.ksp + 16); |
| 2060 | |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 2061 | UNW_DPRINT(1, "unwind.%s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2062 | unw_init_frame_info(info, t, sw); |
| 2063 | } |
| 2064 | EXPORT_SYMBOL(unw_init_from_blocked_task); |
| 2065 | |
| 2066 | static void |
| 2067 | init_unwind_table (struct unw_table *table, const char *name, unsigned long segment_base, |
| 2068 | unsigned long gp, const void *table_start, const void *table_end) |
| 2069 | { |
| 2070 | const struct unw_table_entry *start = table_start, *end = table_end; |
| 2071 | |
| 2072 | table->name = name; |
| 2073 | table->segment_base = segment_base; |
| 2074 | table->gp = gp; |
| 2075 | table->start = segment_base + start[0].start_offset; |
| 2076 | table->end = segment_base + end[-1].end_offset; |
| 2077 | table->array = start; |
| 2078 | table->length = end - start; |
| 2079 | } |
| 2080 | |
| 2081 | void * |
| 2082 | unw_add_unwind_table (const char *name, unsigned long segment_base, unsigned long gp, |
| 2083 | const void *table_start, const void *table_end) |
| 2084 | { |
| 2085 | const struct unw_table_entry *start = table_start, *end = table_end; |
| 2086 | struct unw_table *table; |
| 2087 | unsigned long flags; |
| 2088 | |
| 2089 | if (end - start <= 0) { |
| 2090 | UNW_DPRINT(0, "unwind.%s: ignoring attempt to insert empty unwind table\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 2091 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2092 | return NULL; |
| 2093 | } |
| 2094 | |
| 2095 | table = kmalloc(sizeof(*table), GFP_USER); |
| 2096 | if (!table) |
| 2097 | return NULL; |
| 2098 | |
| 2099 | init_unwind_table(table, name, segment_base, gp, table_start, table_end); |
| 2100 | |
| 2101 | spin_lock_irqsave(&unw.lock, flags); |
| 2102 | { |
| 2103 | /* keep kernel unwind table at the front (it's searched most commonly): */ |
| 2104 | table->next = unw.tables->next; |
| 2105 | unw.tables->next = table; |
| 2106 | } |
| 2107 | spin_unlock_irqrestore(&unw.lock, flags); |
| 2108 | |
| 2109 | return table; |
| 2110 | } |
| 2111 | |
| 2112 | void |
| 2113 | unw_remove_unwind_table (void *handle) |
| 2114 | { |
| 2115 | struct unw_table *table, *prev; |
| 2116 | struct unw_script *tmp; |
| 2117 | unsigned long flags; |
| 2118 | long index; |
| 2119 | |
| 2120 | if (!handle) { |
| 2121 | UNW_DPRINT(0, "unwind.%s: ignoring attempt to remove non-existent unwind table\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 2122 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2123 | return; |
| 2124 | } |
| 2125 | |
| 2126 | table = handle; |
| 2127 | if (table == &unw.kernel_table) { |
| 2128 | UNW_DPRINT(0, "unwind.%s: sorry, freeing the kernel's unwind table is a " |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 2129 | "no-can-do!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2130 | return; |
| 2131 | } |
| 2132 | |
| 2133 | spin_lock_irqsave(&unw.lock, flags); |
| 2134 | { |
| 2135 | /* first, delete the table: */ |
| 2136 | |
| 2137 | for (prev = (struct unw_table *) &unw.tables; prev; prev = prev->next) |
| 2138 | if (prev->next == table) |
| 2139 | break; |
| 2140 | if (!prev) { |
| 2141 | UNW_DPRINT(0, "unwind.%s: failed to find unwind table %p\n", |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 2142 | __func__, (void *) table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2143 | spin_unlock_irqrestore(&unw.lock, flags); |
| 2144 | return; |
| 2145 | } |
| 2146 | prev->next = table->next; |
| 2147 | } |
| 2148 | spin_unlock_irqrestore(&unw.lock, flags); |
| 2149 | |
| 2150 | /* next, remove hash table entries for this table */ |
| 2151 | |
Roel Kluin | aa2f63c | 2009-02-22 02:33:28 +0100 | [diff] [blame] | 2152 | for (index = 0; index < UNW_HASH_SIZE; ++index) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2153 | tmp = unw.cache + unw.hash[index]; |
| 2154 | if (unw.hash[index] >= UNW_CACHE_SIZE |
| 2155 | || tmp->ip < table->start || tmp->ip >= table->end) |
| 2156 | continue; |
| 2157 | |
| 2158 | write_lock(&tmp->lock); |
| 2159 | { |
| 2160 | if (tmp->ip >= table->start && tmp->ip < table->end) { |
| 2161 | unw.hash[index] = tmp->coll_chain; |
| 2162 | tmp->ip = 0; |
| 2163 | } |
| 2164 | } |
| 2165 | write_unlock(&tmp->lock); |
| 2166 | } |
| 2167 | |
| 2168 | kfree(table); |
| 2169 | } |
| 2170 | |
| 2171 | static int __init |
| 2172 | create_gate_table (void) |
| 2173 | { |
| 2174 | const struct unw_table_entry *entry, *start, *end; |
| 2175 | unsigned long *lp, segbase = GATE_ADDR; |
| 2176 | size_t info_size, size; |
| 2177 | char *info; |
| 2178 | Elf64_Phdr *punw = NULL, *phdr = (Elf64_Phdr *) (GATE_ADDR + GATE_EHDR->e_phoff); |
| 2179 | int i; |
| 2180 | |
| 2181 | for (i = 0; i < GATE_EHDR->e_phnum; ++i, ++phdr) |
| 2182 | if (phdr->p_type == PT_IA_64_UNWIND) { |
| 2183 | punw = phdr; |
| 2184 | break; |
| 2185 | } |
| 2186 | |
| 2187 | if (!punw) { |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 2188 | printk("%s: failed to find gate DSO's unwind table!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2189 | return 0; |
| 2190 | } |
| 2191 | |
| 2192 | start = (const struct unw_table_entry *) punw->p_vaddr; |
| 2193 | end = (struct unw_table_entry *) ((char *) start + punw->p_memsz); |
| 2194 | size = 0; |
| 2195 | |
| 2196 | unw_add_unwind_table("linux-gate.so", segbase, 0, start, end); |
| 2197 | |
| 2198 | for (entry = start; entry < end; ++entry) |
| 2199 | size += 3*8 + 8 + 8*UNW_LENGTH(*(u64 *) (segbase + entry->info_offset)); |
| 2200 | size += 8; /* reserve space for "end of table" marker */ |
| 2201 | |
| 2202 | unw.gate_table = kmalloc(size, GFP_KERNEL); |
| 2203 | if (!unw.gate_table) { |
| 2204 | unw.gate_table_size = 0; |
Harvey Harrison | d4ed808 | 2008-03-04 15:15:00 -0800 | [diff] [blame] | 2205 | printk(KERN_ERR "%s: unable to create unwind data for gate page!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2206 | return 0; |
| 2207 | } |
| 2208 | unw.gate_table_size = size; |
| 2209 | |
| 2210 | lp = unw.gate_table; |
| 2211 | info = (char *) unw.gate_table + size; |
| 2212 | |
| 2213 | for (entry = start; entry < end; ++entry, lp += 3) { |
| 2214 | info_size = 8 + 8*UNW_LENGTH(*(u64 *) (segbase + entry->info_offset)); |
| 2215 | info -= info_size; |
| 2216 | memcpy(info, (char *) segbase + entry->info_offset, info_size); |
| 2217 | |
| 2218 | lp[0] = segbase + entry->start_offset; /* start */ |
| 2219 | lp[1] = segbase + entry->end_offset; /* end */ |
| 2220 | lp[2] = info - (char *) unw.gate_table; /* info */ |
| 2221 | } |
| 2222 | *lp = 0; /* end-of-table marker */ |
| 2223 | return 0; |
| 2224 | } |
| 2225 | |
| 2226 | __initcall(create_gate_table); |
| 2227 | |
| 2228 | void __init |
| 2229 | unw_init (void) |
| 2230 | { |
| 2231 | extern char __gp[]; |
| 2232 | extern void unw_hash_index_t_is_too_narrow (void); |
| 2233 | long i, off; |
| 2234 | |
| 2235 | if (8*sizeof(unw_hash_index_t) < UNW_LOG_HASH_SIZE) |
| 2236 | unw_hash_index_t_is_too_narrow(); |
| 2237 | |
Keith Owens | b833961 | 2005-07-21 23:41:00 -0700 | [diff] [blame] | 2238 | unw.sw_off[unw.preg_index[UNW_REG_PRI_UNAT_GR]] = SW(CALLER_UNAT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2239 | unw.sw_off[unw.preg_index[UNW_REG_BSPSTORE]] = SW(AR_BSPSTORE); |
Keith Owens | b833961 | 2005-07-21 23:41:00 -0700 | [diff] [blame] | 2240 | unw.sw_off[unw.preg_index[UNW_REG_PFS]] = SW(AR_PFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2241 | unw.sw_off[unw.preg_index[UNW_REG_RP]] = SW(B0); |
Keith Owens | b833961 | 2005-07-21 23:41:00 -0700 | [diff] [blame] | 2242 | unw.sw_off[unw.preg_index[UNW_REG_UNAT]] = SW(CALLER_UNAT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2243 | unw.sw_off[unw.preg_index[UNW_REG_PR]] = SW(PR); |
| 2244 | unw.sw_off[unw.preg_index[UNW_REG_LC]] = SW(AR_LC); |
| 2245 | unw.sw_off[unw.preg_index[UNW_REG_FPSR]] = SW(AR_FPSR); |
| 2246 | for (i = UNW_REG_R4, off = SW(R4); i <= UNW_REG_R7; ++i, off += 8) |
| 2247 | unw.sw_off[unw.preg_index[i]] = off; |
| 2248 | for (i = UNW_REG_B1, off = SW(B1); i <= UNW_REG_B5; ++i, off += 8) |
| 2249 | unw.sw_off[unw.preg_index[i]] = off; |
| 2250 | for (i = UNW_REG_F2, off = SW(F2); i <= UNW_REG_F5; ++i, off += 16) |
| 2251 | unw.sw_off[unw.preg_index[i]] = off; |
| 2252 | for (i = UNW_REG_F16, off = SW(F16); i <= UNW_REG_F31; ++i, off += 16) |
| 2253 | unw.sw_off[unw.preg_index[i]] = off; |
| 2254 | |
| 2255 | for (i = 0; i < UNW_CACHE_SIZE; ++i) { |
| 2256 | if (i > 0) |
| 2257 | unw.cache[i].lru_chain = (i - 1); |
| 2258 | unw.cache[i].coll_chain = -1; |
| 2259 | rwlock_init(&unw.cache[i].lock); |
| 2260 | } |
| 2261 | unw.lru_head = UNW_CACHE_SIZE - 1; |
| 2262 | unw.lru_tail = 0; |
| 2263 | |
| 2264 | init_unwind_table(&unw.kernel_table, "kernel", KERNEL_START, (unsigned long) __gp, |
| 2265 | __start_unwind, __end_unwind); |
| 2266 | } |
| 2267 | |
| 2268 | /* |
| 2269 | * DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED |
| 2270 | * |
| 2271 | * This system call has been deprecated. The new and improved way to get |
| 2272 | * at the kernel's unwind info is via the gate DSO. The address of the |
| 2273 | * ELF header for this DSO is passed to user-level via AT_SYSINFO_EHDR. |
| 2274 | * |
| 2275 | * DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED |
| 2276 | * |
| 2277 | * This system call copies the unwind data into the buffer pointed to by BUF and returns |
| 2278 | * the size of the unwind data. If BUF_SIZE is smaller than the size of the unwind data |
| 2279 | * or if BUF is NULL, nothing is copied, but the system call still returns the size of the |
| 2280 | * unwind data. |
| 2281 | * |
| 2282 | * The first portion of the unwind data contains an unwind table and rest contains the |
| 2283 | * associated unwind info (in no particular order). The unwind table consists of a table |
| 2284 | * of entries of the form: |
| 2285 | * |
| 2286 | * u64 start; (64-bit address of start of function) |
| 2287 | * u64 end; (64-bit address of start of function) |
| 2288 | * u64 info; (BUF-relative offset to unwind info) |
| 2289 | * |
| 2290 | * The end of the unwind table is indicated by an entry with a START address of zero. |
| 2291 | * |
| 2292 | * Please see the IA-64 Software Conventions and Runtime Architecture manual for details |
| 2293 | * on the format of the unwind info. |
| 2294 | * |
| 2295 | * ERRORS |
| 2296 | * EFAULT BUF points outside your accessible address space. |
| 2297 | */ |
| 2298 | asmlinkage long |
| 2299 | sys_getunwind (void __user *buf, size_t buf_size) |
| 2300 | { |
| 2301 | if (buf && buf_size >= unw.gate_table_size) |
| 2302 | if (copy_to_user(buf, unw.gate_table, unw.gate_table_size) != 0) |
| 2303 | return -EFAULT; |
| 2304 | return unw.gate_table_size; |
| 2305 | } |