Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/m32r/kernel/process.c |
| 3 | * |
| 4 | * Copyright (c) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata, |
| 5 | * Hitoshi Yamamoto |
| 6 | * Taken from sh version. |
| 7 | * Copyright (C) 1995 Linus Torvalds |
| 8 | * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima |
| 9 | */ |
| 10 | |
| 11 | #undef DEBUG_PROCESS |
| 12 | #ifdef DEBUG_PROCESS |
| 13 | #define DPRINTK(fmt, args...) printk("%s:%d:%s: " fmt, __FILE__, __LINE__, \ |
| 14 | __FUNCTION__, ##args) |
| 15 | #else |
| 16 | #define DPRINTK(fmt, args...) |
| 17 | #endif |
| 18 | |
| 19 | /* |
| 20 | * This file handles the architecture-dependent parts of process handling.. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/module.h> |
| 25 | #include <linux/ptrace.h> |
| 26 | #include <linux/unistd.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/hardirq.h> |
| 29 | |
| 30 | #include <asm/io.h> |
| 31 | #include <asm/uaccess.h> |
| 32 | #include <asm/mmu_context.h> |
| 33 | #include <asm/elf.h> |
| 34 | #include <asm/m32r.h> |
| 35 | |
| 36 | #include <linux/err.h> |
| 37 | |
| 38 | static int hlt_counter=0; |
| 39 | |
| 40 | /* |
| 41 | * Return saved PC of a blocked thread. |
| 42 | */ |
| 43 | unsigned long thread_saved_pc(struct task_struct *tsk) |
| 44 | { |
| 45 | return tsk->thread.lr; |
| 46 | } |
| 47 | |
| 48 | /* |
| 49 | * Powermanagement idle function, if any.. |
| 50 | */ |
| 51 | void (*pm_idle)(void) = NULL; |
Eric W. Biederman | 5e38291 | 2006-01-08 01:03:46 -0800 | [diff] [blame] | 52 | EXPORT_SYMBOL(pm_idle); |
| 53 | |
| 54 | void (*pm_power_off)(void) = NULL; |
| 55 | EXPORT_SYMBOL(pm_power_off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | void disable_hlt(void) |
| 58 | { |
| 59 | hlt_counter++; |
| 60 | } |
| 61 | |
| 62 | EXPORT_SYMBOL(disable_hlt); |
| 63 | |
| 64 | void enable_hlt(void) |
| 65 | { |
| 66 | hlt_counter--; |
| 67 | } |
| 68 | |
| 69 | EXPORT_SYMBOL(enable_hlt); |
| 70 | |
| 71 | /* |
| 72 | * We use this is we don't have any better |
| 73 | * idle routine.. |
| 74 | */ |
| 75 | void default_idle(void) |
| 76 | { |
| 77 | /* M32R_FIXME: Please use "cpu_sleep" mode. */ |
| 78 | cpu_relax(); |
| 79 | } |
| 80 | |
| 81 | /* |
| 82 | * On SMP it's slightly faster (but much more power-consuming!) |
| 83 | * to poll the ->work.need_resched flag instead of waiting for the |
| 84 | * cross-CPU IPI to arrive. Use this option with caution. |
| 85 | */ |
| 86 | static void poll_idle (void) |
| 87 | { |
| 88 | /* M32R_FIXME */ |
| 89 | cpu_relax(); |
| 90 | } |
| 91 | |
| 92 | /* |
| 93 | * The idle thread. There's no useful work to be |
| 94 | * done, so just try to conserve power and have a |
| 95 | * low exit latency (ie sit in a loop waiting for |
| 96 | * somebody to say that they'd like to reschedule) |
| 97 | */ |
| 98 | void cpu_idle (void) |
| 99 | { |
| 100 | /* endless idle loop with no priority at all */ |
| 101 | while (1) { |
| 102 | while (!need_resched()) { |
| 103 | void (*idle)(void) = pm_idle; |
| 104 | |
| 105 | if (!idle) |
| 106 | idle = default_idle; |
| 107 | |
| 108 | idle(); |
| 109 | } |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 110 | preempt_enable_no_resched(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | schedule(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 112 | preempt_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | } |
| 114 | } |
| 115 | |
| 116 | void machine_restart(char *__unused) |
| 117 | { |
Hirokazu Takata | 0d34c86 | 2006-04-18 22:21:30 -0700 | [diff] [blame] | 118 | #if defined(CONFIG_PLAT_MAPPI3) |
| 119 | outw(1, (unsigned long)PLD_REBOOT); |
| 120 | #endif |
| 121 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | printk("Please push reset button!\n"); |
| 123 | while (1) |
| 124 | cpu_relax(); |
| 125 | } |
| 126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | void machine_halt(void) |
| 128 | { |
| 129 | printk("Please push reset button!\n"); |
| 130 | while (1) |
| 131 | cpu_relax(); |
| 132 | } |
| 133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | void machine_power_off(void) |
| 135 | { |
| 136 | /* M32R_FIXME */ |
| 137 | } |
| 138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | static int __init idle_setup (char *str) |
| 140 | { |
| 141 | if (!strncmp(str, "poll", 4)) { |
| 142 | printk("using poll in idle threads.\n"); |
| 143 | pm_idle = poll_idle; |
| 144 | } else if (!strncmp(str, "sleep", 4)) { |
| 145 | printk("using sleep in idle threads.\n"); |
| 146 | pm_idle = default_idle; |
| 147 | } |
| 148 | |
| 149 | return 1; |
| 150 | } |
| 151 | |
| 152 | __setup("idle=", idle_setup); |
| 153 | |
| 154 | void show_regs(struct pt_regs * regs) |
| 155 | { |
| 156 | printk("\n"); |
| 157 | printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \ |
| 158 | regs->bpc, regs->psw, regs->lr, regs->fp); |
| 159 | printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \ |
| 160 | regs->bbpc, regs->bbpsw, regs->spu, regs->spi); |
| 161 | printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \ |
| 162 | regs->r0, regs->r1, regs->r2, regs->r3); |
| 163 | printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \ |
| 164 | regs->r4, regs->r5, regs->r6, regs->r7); |
| 165 | printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \ |
| 166 | regs->r8, regs->r9, regs->r10, regs->r11); |
| 167 | printk("R12[%08lx]\n", \ |
| 168 | regs->r12); |
| 169 | |
| 170 | #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2) |
| 171 | printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \ |
| 172 | regs->acc0h, regs->acc0l); |
| 173 | printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \ |
| 174 | regs->acc1h, regs->acc1l); |
| 175 | #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R) |
| 176 | printk("ACCH[%08lx]:ACCL[%08lx]\n", \ |
Hirokazu Takata | 9674dcf | 2007-02-10 01:43:35 -0800 | [diff] [blame] | 177 | regs->acc0h, regs->acc0l); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | #else |
| 179 | #error unknown isa configuration |
| 180 | #endif |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * Create a kernel thread |
| 185 | */ |
| 186 | |
| 187 | /* |
| 188 | * This is the mechanism for creating a new kernel thread. |
| 189 | * |
| 190 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants |
| 191 | * who haven't done an "execve()") should use this: it will work within |
| 192 | * a system call from a "real" process, but the process memory space will |
| 193 | * not be free'd until both the parent and the child have exited. |
| 194 | */ |
| 195 | static void kernel_thread_helper(void *nouse, int (*fn)(void *), void *arg) |
| 196 | { |
| 197 | fn(arg); |
| 198 | do_exit(-1); |
| 199 | } |
| 200 | |
| 201 | int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) |
| 202 | { |
| 203 | struct pt_regs regs; |
| 204 | |
| 205 | memset(®s, 0, sizeof (regs)); |
| 206 | regs.r1 = (unsigned long)fn; |
| 207 | regs.r2 = (unsigned long)arg; |
| 208 | |
| 209 | regs.bpc = (unsigned long)kernel_thread_helper; |
| 210 | |
| 211 | regs.psw = M32R_PSW_BIE; |
| 212 | |
| 213 | /* Ok, create the new process. */ |
| 214 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, |
| 215 | NULL); |
| 216 | } |
| 217 | |
| 218 | /* |
| 219 | * Free current thread data structures etc.. |
| 220 | */ |
| 221 | void exit_thread(void) |
| 222 | { |
| 223 | /* Nothing to do. */ |
| 224 | DPRINTK("pid = %d\n", current->pid); |
| 225 | } |
| 226 | |
| 227 | void flush_thread(void) |
| 228 | { |
| 229 | DPRINTK("pid = %d\n", current->pid); |
| 230 | memset(¤t->thread.debug_trap, 0, sizeof(struct debug_trap)); |
| 231 | } |
| 232 | |
| 233 | void release_thread(struct task_struct *dead_task) |
| 234 | { |
| 235 | /* do nothing */ |
| 236 | DPRINTK("pid = %d\n", dead_task->pid); |
| 237 | } |
| 238 | |
| 239 | /* Fill in the fpu structure for a core dump.. */ |
| 240 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) |
| 241 | { |
| 242 | return 0; /* Task didn't use the fpu at all. */ |
| 243 | } |
| 244 | |
| 245 | int copy_thread(int nr, unsigned long clone_flags, unsigned long spu, |
| 246 | unsigned long unused, struct task_struct *tsk, struct pt_regs *regs) |
| 247 | { |
Al Viro | 6c3559fc | 2006-01-12 01:05:52 -0800 | [diff] [blame] | 248 | struct pt_regs *childregs = task_pt_regs(tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | extern void ret_from_fork(void); |
| 250 | |
| 251 | /* Copy registers */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | *childregs = *regs; |
| 253 | |
| 254 | childregs->spu = spu; |
| 255 | childregs->r0 = 0; /* Child gets zero as return value */ |
| 256 | regs->r0 = tsk->pid; |
| 257 | tsk->thread.sp = (unsigned long)childregs; |
| 258 | tsk->thread.lr = (unsigned long)ret_from_fork; |
| 259 | |
| 260 | return 0; |
| 261 | } |
| 262 | |
| 263 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | * Capture the user space registers if the task is not running (in user space) |
| 265 | */ |
| 266 | int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs) |
| 267 | { |
| 268 | /* M32R_FIXME */ |
| 269 | return 1; |
| 270 | } |
| 271 | |
| 272 | asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2, |
| 273 | unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6, |
| 274 | struct pt_regs regs) |
| 275 | { |
| 276 | #ifdef CONFIG_MMU |
| 277 | return do_fork(SIGCHLD, regs.spu, ®s, 0, NULL, NULL); |
| 278 | #else |
| 279 | return -EINVAL; |
| 280 | #endif /* CONFIG_MMU */ |
| 281 | } |
| 282 | |
| 283 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, |
| 284 | unsigned long parent_tidptr, |
| 285 | unsigned long child_tidptr, |
| 286 | unsigned long r4, unsigned long r5, unsigned long r6, |
| 287 | struct pt_regs regs) |
| 288 | { |
| 289 | if (!newsp) |
| 290 | newsp = regs.spu; |
| 291 | |
| 292 | return do_fork(clone_flags, newsp, ®s, 0, |
| 293 | (int __user *)parent_tidptr, (int __user *)child_tidptr); |
| 294 | } |
| 295 | |
| 296 | /* |
| 297 | * This is trivial, and on the face of it looks like it |
| 298 | * could equally well be done in user mode. |
| 299 | * |
| 300 | * Not so, for quite unobvious reasons - register pressure. |
| 301 | * In user mode vfork() cannot have a stack frame, and if |
| 302 | * done by calling the "clone()" system call directly, you |
| 303 | * do not have enough call-clobbered registers to hold all |
| 304 | * the information you need. |
| 305 | */ |
| 306 | asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2, |
| 307 | unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6, |
| 308 | struct pt_regs regs) |
| 309 | { |
| 310 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, ®s, 0, |
| 311 | NULL, NULL); |
| 312 | } |
| 313 | |
| 314 | /* |
| 315 | * sys_execve() executes a new program. |
| 316 | */ |
| 317 | asmlinkage int sys_execve(char __user *ufilename, char __user * __user *uargv, |
| 318 | char __user * __user *uenvp, |
| 319 | unsigned long r3, unsigned long r4, unsigned long r5, |
| 320 | unsigned long r6, struct pt_regs regs) |
| 321 | { |
| 322 | int error; |
| 323 | char *filename; |
| 324 | |
| 325 | filename = getname(ufilename); |
| 326 | error = PTR_ERR(filename); |
| 327 | if (IS_ERR(filename)) |
| 328 | goto out; |
| 329 | |
| 330 | error = do_execve(filename, uargv, uenvp, ®s); |
| 331 | if (error == 0) { |
| 332 | task_lock(current); |
| 333 | current->ptrace &= ~PT_DTRACE; |
| 334 | task_unlock(current); |
| 335 | } |
| 336 | putname(filename); |
| 337 | out: |
| 338 | return error; |
| 339 | } |
| 340 | |
| 341 | /* |
| 342 | * These bracket the sleeping functions.. |
| 343 | */ |
| 344 | #define first_sched ((unsigned long) scheduling_functions_start_here) |
| 345 | #define last_sched ((unsigned long) scheduling_functions_end_here) |
| 346 | |
| 347 | unsigned long get_wchan(struct task_struct *p) |
| 348 | { |
| 349 | /* M32R_FIXME */ |
| 350 | return (0); |
| 351 | } |