David S. Miller | 5526b7e | 2008-04-27 02:26:36 -0700 | [diff] [blame] | 1 | /* linux/arch/sparc/kernel/signal.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * |
| 3 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 4 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) |
| 5 | * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) |
| 6 | * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) |
| 7 | */ |
| 8 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/sched.h> |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/signal.h> |
| 12 | #include <linux/errno.h> |
| 13 | #include <linux/wait.h> |
| 14 | #include <linux/ptrace.h> |
| 15 | #include <linux/unistd.h> |
| 16 | #include <linux/mm.h> |
| 17 | #include <linux/tty.h> |
| 18 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/binfmts.h> /* do_coredum */ |
| 20 | #include <linux/bitops.h> |
David S. Miller | 5a157d5 | 2008-07-27 03:38:53 -0700 | [diff] [blame] | 21 | #include <linux/tracehook.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
| 23 | #include <asm/uaccess.h> |
| 24 | #include <asm/ptrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <asm/pgalloc.h> |
| 26 | #include <asm/pgtable.h> |
| 27 | #include <asm/cacheflush.h> /* flush_sig_insns */ |
| 28 | |
| 29 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| 30 | |
| 31 | extern void fpsave(unsigned long *fpregs, unsigned long *fsr, |
| 32 | void *fpqueue, unsigned long *fpqdepth); |
| 33 | extern void fpload(unsigned long *fpregs, unsigned long *fsr); |
| 34 | |
David S. Miller | 5526b7e | 2008-04-27 02:26:36 -0700 | [diff] [blame] | 35 | struct signal_frame { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | struct sparc_stackf ss; |
Sam Ravnborg | 4d7b92a | 2009-01-02 19:32:59 -0800 | [diff] [blame] | 37 | __siginfo32_t info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | __siginfo_fpu_t __user *fpu_save; |
| 39 | unsigned long insns[2] __attribute__ ((aligned (8))); |
| 40 | unsigned int extramask[_NSIG_WORDS - 1]; |
| 41 | unsigned int extra_size; /* Should be 0 */ |
| 42 | __siginfo_fpu_t fpu_state; |
| 43 | }; |
| 44 | |
| 45 | struct rt_signal_frame { |
| 46 | struct sparc_stackf ss; |
| 47 | siginfo_t info; |
| 48 | struct pt_regs regs; |
| 49 | sigset_t mask; |
| 50 | __siginfo_fpu_t __user *fpu_save; |
| 51 | unsigned int insns[2]; |
| 52 | stack_t stack; |
| 53 | unsigned int extra_size; /* Should be 0 */ |
| 54 | __siginfo_fpu_t fpu_state; |
| 55 | }; |
| 56 | |
| 57 | /* Align macros */ |
David S. Miller | 5526b7e | 2008-04-27 02:26:36 -0700 | [diff] [blame] | 58 | #define SF_ALIGNEDSZ (((sizeof(struct signal_frame) + 7) & (~7))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7))) |
| 60 | |
David S. Miller | 2d7d5f0 | 2006-01-19 02:42:49 -0800 | [diff] [blame] | 61 | static int _sigpause_common(old_sigset_t set) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | set &= _BLOCKABLE; |
| 64 | spin_lock_irq(¤t->sighand->siglock); |
David S. Miller | 2d7d5f0 | 2006-01-19 02:42:49 -0800 | [diff] [blame] | 65 | current->saved_sigmask = current->blocked; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | siginitset(¤t->blocked, set); |
| 67 | recalc_sigpending(); |
| 68 | spin_unlock_irq(¤t->sighand->siglock); |
| 69 | |
David S. Miller | 2d7d5f0 | 2006-01-19 02:42:49 -0800 | [diff] [blame] | 70 | current->state = TASK_INTERRUPTIBLE; |
| 71 | schedule(); |
| 72 | set_thread_flag(TIF_RESTORE_SIGMASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
David S. Miller | 2d7d5f0 | 2006-01-19 02:42:49 -0800 | [diff] [blame] | 74 | return -ERESTARTNOHAND; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | } |
| 76 | |
David S. Miller | 2d7d5f0 | 2006-01-19 02:42:49 -0800 | [diff] [blame] | 77 | asmlinkage int sys_sigsuspend(old_sigset_t set) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | { |
David S. Miller | 2d7d5f0 | 2006-01-19 02:42:49 -0800 | [diff] [blame] | 79 | return _sigpause_common(set); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | static inline int |
| 83 | restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) |
| 84 | { |
| 85 | int err; |
| 86 | #ifdef CONFIG_SMP |
| 87 | if (test_tsk_thread_flag(current, TIF_USEDFPU)) |
| 88 | regs->psr &= ~PSR_EF; |
| 89 | #else |
| 90 | if (current == last_task_used_math) { |
| 91 | last_task_used_math = NULL; |
| 92 | regs->psr &= ~PSR_EF; |
| 93 | } |
| 94 | #endif |
| 95 | set_used_math(); |
| 96 | clear_tsk_thread_flag(current, TIF_USEDFPU); |
| 97 | |
| 98 | if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu))) |
| 99 | return -EFAULT; |
| 100 | |
| 101 | err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0], |
| 102 | (sizeof(unsigned long) * 32)); |
| 103 | err |= __get_user(current->thread.fsr, &fpu->si_fsr); |
| 104 | err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth); |
| 105 | if (current->thread.fpqdepth != 0) |
| 106 | err |= __copy_from_user(¤t->thread.fpqueue[0], |
| 107 | &fpu->si_fpqueue[0], |
| 108 | ((sizeof(unsigned long) + |
| 109 | (sizeof(unsigned long *)))*16)); |
| 110 | return err; |
| 111 | } |
| 112 | |
David S. Miller | 5526b7e | 2008-04-27 02:26:36 -0700 | [diff] [blame] | 113 | asmlinkage void do_sigreturn(struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | { |
David S. Miller | 5526b7e | 2008-04-27 02:26:36 -0700 | [diff] [blame] | 115 | struct signal_frame __user *sf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | unsigned long up_psr, pc, npc; |
| 117 | sigset_t set; |
| 118 | __siginfo_fpu_t __user *fpu_save; |
| 119 | int err; |
| 120 | |
David S. Miller | 5526b7e | 2008-04-27 02:26:36 -0700 | [diff] [blame] | 121 | /* Always make any pending restarted system calls return -EINTR */ |
| 122 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 123 | |
| 124 | synchronize_user_stack(); |
| 125 | |
| 126 | sf = (struct signal_frame __user *) regs->u_regs[UREG_FP]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
| 128 | /* 1. Make sure we are not getting garbage from the user */ |
| 129 | if (!access_ok(VERIFY_READ, sf, sizeof(*sf))) |
| 130 | goto segv_and_exit; |
| 131 | |
| 132 | if (((unsigned long) sf) & 3) |
| 133 | goto segv_and_exit; |
| 134 | |
| 135 | err = __get_user(pc, &sf->info.si_regs.pc); |
| 136 | err |= __get_user(npc, &sf->info.si_regs.npc); |
| 137 | |
| 138 | if ((pc | npc) & 3) |
| 139 | goto segv_and_exit; |
| 140 | |
| 141 | /* 2. Restore the state */ |
| 142 | up_psr = regs->psr; |
| 143 | err |= __copy_from_user(regs, &sf->info.si_regs, sizeof(struct pt_regs)); |
| 144 | |
| 145 | /* User can only change condition codes and FPU enabling in %psr. */ |
| 146 | regs->psr = (up_psr & ~(PSR_ICC | PSR_EF)) |
| 147 | | (regs->psr & (PSR_ICC | PSR_EF)); |
| 148 | |
David S. Miller | 28e6103 | 2008-05-11 02:07:19 -0700 | [diff] [blame] | 149 | /* Prevent syscall restart. */ |
| 150 | pt_regs_clear_syscall(regs); |
| 151 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | err |= __get_user(fpu_save, &sf->fpu_save); |
| 153 | |
| 154 | if (fpu_save) |
| 155 | err |= restore_fpu_state(regs, fpu_save); |
| 156 | |
| 157 | /* This is pretty much atomic, no amount locking would prevent |
| 158 | * the races which exist anyways. |
| 159 | */ |
| 160 | err |= __get_user(set.sig[0], &sf->info.si_mask); |
| 161 | err |= __copy_from_user(&set.sig[1], &sf->extramask, |
| 162 | (_NSIG_WORDS-1) * sizeof(unsigned int)); |
| 163 | |
| 164 | if (err) |
| 165 | goto segv_and_exit; |
| 166 | |
| 167 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 168 | spin_lock_irq(¤t->sighand->siglock); |
| 169 | current->blocked = set; |
| 170 | recalc_sigpending(); |
| 171 | spin_unlock_irq(¤t->sighand->siglock); |
| 172 | return; |
| 173 | |
| 174 | segv_and_exit: |
| 175 | force_sig(SIGSEGV, current); |
| 176 | } |
| 177 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | asmlinkage void do_rt_sigreturn(struct pt_regs *regs) |
| 179 | { |
| 180 | struct rt_signal_frame __user *sf; |
| 181 | unsigned int psr, pc, npc; |
| 182 | __siginfo_fpu_t __user *fpu_save; |
| 183 | mm_segment_t old_fs; |
| 184 | sigset_t set; |
| 185 | stack_t st; |
| 186 | int err; |
| 187 | |
| 188 | synchronize_user_stack(); |
| 189 | sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP]; |
| 190 | if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || |
| 191 | (((unsigned long) sf) & 0x03)) |
| 192 | goto segv; |
| 193 | |
| 194 | err = __get_user(pc, &sf->regs.pc); |
| 195 | err |= __get_user(npc, &sf->regs.npc); |
| 196 | err |= ((pc | npc) & 0x03); |
| 197 | |
| 198 | err |= __get_user(regs->y, &sf->regs.y); |
| 199 | err |= __get_user(psr, &sf->regs.psr); |
| 200 | |
| 201 | err |= __copy_from_user(®s->u_regs[UREG_G1], |
| 202 | &sf->regs.u_regs[UREG_G1], 15 * sizeof(u32)); |
| 203 | |
| 204 | regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC); |
| 205 | |
David S. Miller | 28e6103 | 2008-05-11 02:07:19 -0700 | [diff] [blame] | 206 | /* Prevent syscall restart. */ |
| 207 | pt_regs_clear_syscall(regs); |
| 208 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | err |= __get_user(fpu_save, &sf->fpu_save); |
| 210 | |
| 211 | if (fpu_save) |
| 212 | err |= restore_fpu_state(regs, fpu_save); |
| 213 | err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t)); |
| 214 | |
| 215 | err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t)); |
| 216 | |
| 217 | if (err) |
| 218 | goto segv; |
| 219 | |
| 220 | regs->pc = pc; |
| 221 | regs->npc = npc; |
| 222 | |
| 223 | /* It is more difficult to avoid calling this function than to |
| 224 | * call it and ignore errors. |
| 225 | */ |
| 226 | old_fs = get_fs(); |
| 227 | set_fs(KERNEL_DS); |
| 228 | do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf); |
| 229 | set_fs(old_fs); |
| 230 | |
| 231 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 232 | spin_lock_irq(¤t->sighand->siglock); |
| 233 | current->blocked = set; |
| 234 | recalc_sigpending(); |
| 235 | spin_unlock_irq(¤t->sighand->siglock); |
| 236 | return; |
| 237 | segv: |
| 238 | force_sig(SIGSEGV, current); |
| 239 | } |
| 240 | |
| 241 | /* Checks if the fp is valid */ |
| 242 | static inline int invalid_frame_pointer(void __user *fp, int fplen) |
| 243 | { |
| 244 | if ((((unsigned long) fp) & 7) || |
| 245 | !__access_ok((unsigned long)fp, fplen) || |
| 246 | ((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) && |
| 247 | ((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000))) |
| 248 | return 1; |
| 249 | |
| 250 | return 0; |
| 251 | } |
| 252 | |
| 253 | static inline void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize) |
| 254 | { |
David S. Miller | dc5dc7e | 2008-05-07 18:54:05 -0700 | [diff] [blame] | 255 | unsigned long sp = regs->u_regs[UREG_FP]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
David S. Miller | dc5dc7e | 2008-05-07 18:54:05 -0700 | [diff] [blame] | 257 | /* |
| 258 | * If we are on the alternate signal stack and would overflow it, don't. |
| 259 | * Return an always-bogus address instead so we will die with SIGSEGV. |
| 260 | */ |
| 261 | if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) |
| 262 | return (void __user *) -1L; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | |
| 264 | /* This is the X/Open sanctioned signal stack switching. */ |
| 265 | if (sa->sa_flags & SA_ONSTACK) { |
David S. Miller | dc5dc7e | 2008-05-07 18:54:05 -0700 | [diff] [blame] | 266 | if (sas_ss_flags(sp) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | sp = current->sas_ss_sp + current->sas_ss_size; |
| 268 | } |
David S. Miller | dc5dc7e | 2008-05-07 18:54:05 -0700 | [diff] [blame] | 269 | |
David S. Miller | f036d9f | 2010-02-09 16:18:40 -0800 | [diff] [blame] | 270 | sp -= framesize; |
| 271 | |
David S. Miller | dc5dc7e | 2008-05-07 18:54:05 -0700 | [diff] [blame] | 272 | /* Always align the stack frame. This handles two cases. First, |
| 273 | * sigaltstack need not be mindful of platform specific stack |
| 274 | * alignment. Second, if we took this signal because the stack |
| 275 | * is not aligned properly, we'd like to take the signal cleanly |
| 276 | * and report that. |
| 277 | */ |
David S. Miller | f036d9f | 2010-02-09 16:18:40 -0800 | [diff] [blame] | 278 | sp &= ~15UL; |
David S. Miller | dc5dc7e | 2008-05-07 18:54:05 -0700 | [diff] [blame] | 279 | |
David S. Miller | f036d9f | 2010-02-09 16:18:40 -0800 | [diff] [blame] | 280 | return (void __user *) sp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | } |
| 282 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | static inline int |
| 284 | save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) |
| 285 | { |
| 286 | int err = 0; |
| 287 | #ifdef CONFIG_SMP |
| 288 | if (test_tsk_thread_flag(current, TIF_USEDFPU)) { |
| 289 | put_psr(get_psr() | PSR_EF); |
| 290 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, |
| 291 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); |
| 292 | regs->psr &= ~(PSR_EF); |
| 293 | clear_tsk_thread_flag(current, TIF_USEDFPU); |
| 294 | } |
| 295 | #else |
| 296 | if (current == last_task_used_math) { |
| 297 | put_psr(get_psr() | PSR_EF); |
| 298 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, |
| 299 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); |
| 300 | last_task_used_math = NULL; |
| 301 | regs->psr &= ~(PSR_EF); |
| 302 | } |
| 303 | #endif |
| 304 | err |= __copy_to_user(&fpu->si_float_regs[0], |
| 305 | ¤t->thread.float_regs[0], |
| 306 | (sizeof(unsigned long) * 32)); |
| 307 | err |= __put_user(current->thread.fsr, &fpu->si_fsr); |
| 308 | err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth); |
| 309 | if (current->thread.fpqdepth != 0) |
| 310 | err |= __copy_to_user(&fpu->si_fpqueue[0], |
| 311 | ¤t->thread.fpqueue[0], |
| 312 | ((sizeof(unsigned long) + |
| 313 | (sizeof(unsigned long *)))*16)); |
| 314 | clear_used_math(); |
| 315 | return err; |
| 316 | } |
| 317 | |
David S. Miller | 392c218 | 2010-09-21 21:41:12 -0700 | [diff] [blame] | 318 | static int setup_frame(struct k_sigaction *ka, struct pt_regs *regs, |
| 319 | int signo, sigset_t *oldset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | { |
David S. Miller | 5526b7e | 2008-04-27 02:26:36 -0700 | [diff] [blame] | 321 | struct signal_frame __user *sf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | int sigframe_size, err; |
| 323 | |
| 324 | /* 1. Make sure everything is clean */ |
| 325 | synchronize_user_stack(); |
| 326 | |
David S. Miller | 5526b7e | 2008-04-27 02:26:36 -0700 | [diff] [blame] | 327 | sigframe_size = SF_ALIGNEDSZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | if (!used_math()) |
| 329 | sigframe_size -= sizeof(__siginfo_fpu_t); |
| 330 | |
David S. Miller | 5526b7e | 2008-04-27 02:26:36 -0700 | [diff] [blame] | 331 | sf = (struct signal_frame __user *) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | get_sigframe(&ka->sa, regs, sigframe_size); |
| 333 | |
| 334 | if (invalid_frame_pointer(sf, sigframe_size)) |
| 335 | goto sigill_and_return; |
| 336 | |
| 337 | if (current_thread_info()->w_saved != 0) |
| 338 | goto sigill_and_return; |
| 339 | |
| 340 | /* 2. Save the current process state */ |
| 341 | err = __copy_to_user(&sf->info.si_regs, regs, sizeof(struct pt_regs)); |
| 342 | |
| 343 | err |= __put_user(0, &sf->extra_size); |
| 344 | |
| 345 | if (used_math()) { |
| 346 | err |= save_fpu_state(regs, &sf->fpu_state); |
| 347 | err |= __put_user(&sf->fpu_state, &sf->fpu_save); |
| 348 | } else { |
| 349 | err |= __put_user(0, &sf->fpu_save); |
| 350 | } |
| 351 | |
| 352 | err |= __put_user(oldset->sig[0], &sf->info.si_mask); |
| 353 | err |= __copy_to_user(sf->extramask, &oldset->sig[1], |
| 354 | (_NSIG_WORDS - 1) * sizeof(unsigned int)); |
| 355 | err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP], |
Sam Ravnborg | 4d7b92a | 2009-01-02 19:32:59 -0800 | [diff] [blame] | 356 | sizeof(struct reg_window32)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | if (err) |
| 358 | goto sigsegv; |
| 359 | |
| 360 | /* 3. signal handler back-trampoline and parameters */ |
| 361 | regs->u_regs[UREG_FP] = (unsigned long) sf; |
| 362 | regs->u_regs[UREG_I0] = signo; |
| 363 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; |
| 364 | regs->u_regs[UREG_I2] = (unsigned long) &sf->info; |
| 365 | |
| 366 | /* 4. signal handler */ |
| 367 | regs->pc = (unsigned long) ka->sa.sa_handler; |
| 368 | regs->npc = (regs->pc + 4); |
| 369 | |
| 370 | /* 5. return to kernel instructions */ |
| 371 | if (ka->ka_restorer) |
| 372 | regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; |
| 373 | else { |
| 374 | regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2); |
| 375 | |
| 376 | /* mov __NR_sigreturn, %g1 */ |
| 377 | err |= __put_user(0x821020d8, &sf->insns[0]); |
| 378 | |
| 379 | /* t 0x10 */ |
| 380 | err |= __put_user(0x91d02010, &sf->insns[1]); |
| 381 | if (err) |
| 382 | goto sigsegv; |
| 383 | |
| 384 | /* Flush instruction space. */ |
| 385 | flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); |
| 386 | } |
David S. Miller | 392c218 | 2010-09-21 21:41:12 -0700 | [diff] [blame] | 387 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | |
| 389 | sigill_and_return: |
| 390 | do_exit(SIGILL); |
David S. Miller | 392c218 | 2010-09-21 21:41:12 -0700 | [diff] [blame] | 391 | return -EINVAL; |
| 392 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | sigsegv: |
| 394 | force_sigsegv(signo, current); |
David S. Miller | 392c218 | 2010-09-21 21:41:12 -0700 | [diff] [blame] | 395 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | } |
| 397 | |
David S. Miller | 392c218 | 2010-09-21 21:41:12 -0700 | [diff] [blame] | 398 | static int setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs, |
| 399 | int signo, sigset_t *oldset, siginfo_t *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | { |
| 401 | struct rt_signal_frame __user *sf; |
| 402 | int sigframe_size; |
| 403 | unsigned int psr; |
| 404 | int err; |
| 405 | |
| 406 | synchronize_user_stack(); |
| 407 | sigframe_size = RT_ALIGNEDSZ; |
| 408 | if (!used_math()) |
| 409 | sigframe_size -= sizeof(__siginfo_fpu_t); |
| 410 | sf = (struct rt_signal_frame __user *) |
| 411 | get_sigframe(&ka->sa, regs, sigframe_size); |
| 412 | if (invalid_frame_pointer(sf, sigframe_size)) |
| 413 | goto sigill; |
| 414 | if (current_thread_info()->w_saved != 0) |
| 415 | goto sigill; |
| 416 | |
| 417 | err = __put_user(regs->pc, &sf->regs.pc); |
| 418 | err |= __put_user(regs->npc, &sf->regs.npc); |
| 419 | err |= __put_user(regs->y, &sf->regs.y); |
| 420 | psr = regs->psr; |
| 421 | if (used_math()) |
| 422 | psr |= PSR_EF; |
| 423 | err |= __put_user(psr, &sf->regs.psr); |
| 424 | err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs)); |
| 425 | err |= __put_user(0, &sf->extra_size); |
| 426 | |
| 427 | if (psr & PSR_EF) { |
| 428 | err |= save_fpu_state(regs, &sf->fpu_state); |
| 429 | err |= __put_user(&sf->fpu_state, &sf->fpu_save); |
| 430 | } else { |
| 431 | err |= __put_user(0, &sf->fpu_save); |
| 432 | } |
| 433 | err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t)); |
| 434 | |
| 435 | /* Setup sigaltstack */ |
| 436 | err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp); |
| 437 | err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); |
| 438 | err |= __put_user(current->sas_ss_size, &sf->stack.ss_size); |
| 439 | |
| 440 | err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP], |
Sam Ravnborg | 4d7b92a | 2009-01-02 19:32:59 -0800 | [diff] [blame] | 441 | sizeof(struct reg_window32)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | |
| 443 | err |= copy_siginfo_to_user(&sf->info, info); |
| 444 | |
| 445 | if (err) |
| 446 | goto sigsegv; |
| 447 | |
| 448 | regs->u_regs[UREG_FP] = (unsigned long) sf; |
| 449 | regs->u_regs[UREG_I0] = signo; |
| 450 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; |
| 451 | regs->u_regs[UREG_I2] = (unsigned long) &sf->regs; |
| 452 | |
| 453 | regs->pc = (unsigned long) ka->sa.sa_handler; |
| 454 | regs->npc = (regs->pc + 4); |
| 455 | |
| 456 | if (ka->ka_restorer) |
| 457 | regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; |
| 458 | else { |
| 459 | regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2); |
| 460 | |
| 461 | /* mov __NR_sigreturn, %g1 */ |
| 462 | err |= __put_user(0x821020d8, &sf->insns[0]); |
| 463 | |
| 464 | /* t 0x10 */ |
| 465 | err |= __put_user(0x91d02010, &sf->insns[1]); |
| 466 | if (err) |
| 467 | goto sigsegv; |
| 468 | |
| 469 | /* Flush instruction space. */ |
| 470 | flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); |
| 471 | } |
David S. Miller | 392c218 | 2010-09-21 21:41:12 -0700 | [diff] [blame] | 472 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | |
| 474 | sigill: |
| 475 | do_exit(SIGILL); |
David S. Miller | 392c218 | 2010-09-21 21:41:12 -0700 | [diff] [blame] | 476 | return -EINVAL; |
| 477 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | sigsegv: |
| 479 | force_sigsegv(signo, current); |
David S. Miller | 392c218 | 2010-09-21 21:41:12 -0700 | [diff] [blame] | 480 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | } |
| 482 | |
David S. Miller | 392c218 | 2010-09-21 21:41:12 -0700 | [diff] [blame] | 483 | static inline int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | handle_signal(unsigned long signr, struct k_sigaction *ka, |
David S. Miller | ec98c6b | 2008-04-20 02:14:23 -0700 | [diff] [blame] | 485 | siginfo_t *info, sigset_t *oldset, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | { |
David S. Miller | 392c218 | 2010-09-21 21:41:12 -0700 | [diff] [blame] | 487 | int err; |
| 488 | |
David S. Miller | ec98c6b | 2008-04-20 02:14:23 -0700 | [diff] [blame] | 489 | if (ka->sa.sa_flags & SA_SIGINFO) |
David S. Miller | 392c218 | 2010-09-21 21:41:12 -0700 | [diff] [blame] | 490 | err = setup_rt_frame(ka, regs, signr, oldset, info); |
David S. Miller | ec98c6b | 2008-04-20 02:14:23 -0700 | [diff] [blame] | 491 | else |
David S. Miller | 392c218 | 2010-09-21 21:41:12 -0700 | [diff] [blame] | 492 | err = setup_frame(ka, regs, signr, oldset); |
| 493 | |
| 494 | if (err) |
| 495 | return err; |
David S. Miller | ec98c6b | 2008-04-20 02:14:23 -0700 | [diff] [blame] | 496 | |
Steven Rostedt | 69be8f1 | 2005-08-29 11:44:09 -0400 | [diff] [blame] | 497 | spin_lock_irq(¤t->sighand->siglock); |
| 498 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); |
| 499 | if (!(ka->sa.sa_flags & SA_NOMASK)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | sigaddset(¤t->blocked, signr); |
Steven Rostedt | 69be8f1 | 2005-08-29 11:44:09 -0400 | [diff] [blame] | 501 | recalc_sigpending(); |
| 502 | spin_unlock_irq(¤t->sighand->siglock); |
David S. Miller | 392c218 | 2010-09-21 21:41:12 -0700 | [diff] [blame] | 503 | |
| 504 | tracehook_signal_handler(signr, info, ka, regs, 0); |
| 505 | |
| 506 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | } |
| 508 | |
| 509 | static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, |
| 510 | struct sigaction *sa) |
| 511 | { |
| 512 | switch(regs->u_regs[UREG_I0]) { |
| 513 | case ERESTART_RESTARTBLOCK: |
| 514 | case ERESTARTNOHAND: |
| 515 | no_system_call_restart: |
| 516 | regs->u_regs[UREG_I0] = EINTR; |
| 517 | regs->psr |= PSR_C; |
| 518 | break; |
| 519 | case ERESTARTSYS: |
| 520 | if (!(sa->sa_flags & SA_RESTART)) |
| 521 | goto no_system_call_restart; |
| 522 | /* fallthrough */ |
| 523 | case ERESTARTNOINTR: |
| 524 | regs->u_regs[UREG_I0] = orig_i0; |
| 525 | regs->pc -= 4; |
| 526 | regs->npc -= 4; |
| 527 | } |
| 528 | } |
| 529 | |
| 530 | /* Note that 'init' is a special process: it doesn't get signals it doesn't |
| 531 | * want to handle. Thus you cannot kill init even with a SIGKILL even by |
| 532 | * mistake. |
| 533 | */ |
David S. Miller | 5a157d5 | 2008-07-27 03:38:53 -0700 | [diff] [blame] | 534 | static void do_signal(struct pt_regs *regs, unsigned long orig_i0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | struct k_sigaction ka; |
David S. Miller | 28e6103 | 2008-05-11 02:07:19 -0700 | [diff] [blame] | 537 | int restart_syscall; |
David S. Miller | 2d7d5f0 | 2006-01-19 02:42:49 -0800 | [diff] [blame] | 538 | sigset_t *oldset; |
David S. Miller | 28e6103 | 2008-05-11 02:07:19 -0700 | [diff] [blame] | 539 | siginfo_t info; |
| 540 | int signr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | |
David S. Miller | 28e6103 | 2008-05-11 02:07:19 -0700 | [diff] [blame] | 542 | if (pt_regs_is_syscall(regs) && (regs->psr & PSR_C)) |
| 543 | restart_syscall = 1; |
| 544 | else |
| 545 | restart_syscall = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | |
David S. Miller | 2d7d5f0 | 2006-01-19 02:42:49 -0800 | [diff] [blame] | 547 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
| 548 | oldset = ¤t->saved_sigmask; |
| 549 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | oldset = ¤t->blocked; |
| 551 | |
David S. Miller | 28e6103 | 2008-05-11 02:07:19 -0700 | [diff] [blame] | 552 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
| 553 | |
| 554 | /* If the debugger messes with the program counter, it clears |
| 555 | * the software "in syscall" bit, directing us to not perform |
| 556 | * a syscall restart. |
| 557 | */ |
| 558 | if (restart_syscall && !pt_regs_is_syscall(regs)) |
| 559 | restart_syscall = 0; |
| 560 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | if (signr > 0) { |
David S. Miller | 28e6103 | 2008-05-11 02:07:19 -0700 | [diff] [blame] | 562 | if (restart_syscall) |
| 563 | syscall_restart(orig_i0, regs, &ka.sa); |
David S. Miller | 392c218 | 2010-09-21 21:41:12 -0700 | [diff] [blame] | 564 | if (handle_signal(signr, &ka, &info, oldset, regs) == 0) { |
| 565 | /* a signal was successfully delivered; the saved |
| 566 | * sigmask will have been stored in the signal frame, |
| 567 | * and will be restored by sigreturn, so we can simply |
| 568 | * clear the TIF_RESTORE_SIGMASK flag. |
| 569 | */ |
| 570 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
| 571 | clear_thread_flag(TIF_RESTORE_SIGMASK); |
| 572 | } |
David S. Miller | 2d7d5f0 | 2006-01-19 02:42:49 -0800 | [diff] [blame] | 573 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | } |
David S. Miller | 28e6103 | 2008-05-11 02:07:19 -0700 | [diff] [blame] | 575 | if (restart_syscall && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || |
| 577 | regs->u_regs[UREG_I0] == ERESTARTSYS || |
| 578 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { |
| 579 | /* replay the system call when we are done */ |
David S. Miller | 28e6103 | 2008-05-11 02:07:19 -0700 | [diff] [blame] | 580 | regs->u_regs[UREG_I0] = orig_i0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | regs->pc -= 4; |
| 582 | regs->npc -= 4; |
David S. Miller | c278525 | 2010-09-21 22:30:13 -0700 | [diff] [blame] | 583 | pt_regs_clear_syscall(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | } |
David S. Miller | 28e6103 | 2008-05-11 02:07:19 -0700 | [diff] [blame] | 585 | if (restart_syscall && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { |
| 587 | regs->u_regs[UREG_G1] = __NR_restart_syscall; |
| 588 | regs->pc -= 4; |
| 589 | regs->npc -= 4; |
David S. Miller | c278525 | 2010-09-21 22:30:13 -0700 | [diff] [blame] | 590 | pt_regs_clear_syscall(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | } |
David S. Miller | 2d7d5f0 | 2006-01-19 02:42:49 -0800 | [diff] [blame] | 592 | |
| 593 | /* if there's no signal to deliver, we just put the saved sigmask |
| 594 | * back |
| 595 | */ |
| 596 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { |
| 597 | clear_thread_flag(TIF_RESTORE_SIGMASK); |
| 598 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); |
| 599 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | } |
| 601 | |
David S. Miller | 5a157d5 | 2008-07-27 03:38:53 -0700 | [diff] [blame] | 602 | void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, |
| 603 | unsigned long thread_info_flags) |
| 604 | { |
| 605 | if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) |
| 606 | do_signal(regs, orig_i0); |
| 607 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { |
| 608 | clear_thread_flag(TIF_NOTIFY_RESUME); |
| 609 | tracehook_notify_resume(regs); |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 610 | if (current->replacement_session_keyring) |
| 611 | key_replace_session_keyring(); |
David S. Miller | 5a157d5 | 2008-07-27 03:38:53 -0700 | [diff] [blame] | 612 | } |
| 613 | } |
| 614 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | asmlinkage int |
| 616 | do_sys_sigstack(struct sigstack __user *ssptr, struct sigstack __user *ossptr, |
| 617 | unsigned long sp) |
| 618 | { |
| 619 | int ret = -EFAULT; |
| 620 | |
| 621 | /* First see if old state is wanted. */ |
| 622 | if (ossptr) { |
| 623 | if (put_user(current->sas_ss_sp + current->sas_ss_size, |
| 624 | &ossptr->the_stack) || |
| 625 | __put_user(on_sig_stack(sp), &ossptr->cur_status)) |
| 626 | goto out; |
| 627 | } |
| 628 | |
| 629 | /* Now see if we want to update the new state. */ |
| 630 | if (ssptr) { |
| 631 | char *ss_sp; |
| 632 | |
| 633 | if (get_user(ss_sp, &ssptr->the_stack)) |
| 634 | goto out; |
| 635 | /* If the current stack was set with sigaltstack, don't |
| 636 | swap stacks while we are on it. */ |
| 637 | ret = -EPERM; |
| 638 | if (current->sas_ss_sp && on_sig_stack(sp)) |
| 639 | goto out; |
| 640 | |
| 641 | /* Since we don't know the extent of the stack, and we don't |
| 642 | track onstack-ness, but rather calculate it, we must |
| 643 | presume a size. Ho hum this interface is lossy. */ |
| 644 | current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; |
| 645 | current->sas_ss_size = SIGSTKSZ; |
| 646 | } |
| 647 | ret = 0; |
| 648 | out: |
| 649 | return ret; |
| 650 | } |