Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/sh/kernel/signal.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | * |
| 6 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson |
| 7 | * |
| 8 | * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima |
| 9 | * |
| 10 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/sched.h> |
| 12 | #include <linux/mm.h> |
| 13 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/kernel.h> |
| 15 | #include <linux/signal.h> |
| 16 | #include <linux/errno.h> |
| 17 | #include <linux/wait.h> |
| 18 | #include <linux/ptrace.h> |
| 19 | #include <linux/unistd.h> |
| 20 | #include <linux/stddef.h> |
| 21 | #include <linux/tty.h> |
Paul Mundt | 19f9a34 | 2006-09-27 18:33:49 +0900 | [diff] [blame] | 22 | #include <linux/elf.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/personality.h> |
| 24 | #include <linux/binfmts.h> |
Nigel Cunningham | 7dfb710 | 2006-12-06 20:34:23 -0800 | [diff] [blame] | 25 | #include <linux/freezer.h> |
Paul Mundt | b66d51c | 2007-06-01 17:26:13 +0900 | [diff] [blame] | 26 | #include <linux/io.h> |
Paul Mundt | ab99c73 | 2008-07-30 19:55:30 +0900 | [diff] [blame] | 27 | #include <linux/tracehook.h> |
Paul Mundt | bd07999 | 2007-05-08 14:50:59 +0900 | [diff] [blame] | 28 | #include <asm/system.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <asm/ucontext.h> |
| 30 | #include <asm/uaccess.h> |
| 31 | #include <asm/pgtable.h> |
| 32 | #include <asm/cacheflush.h> |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 33 | #include <asm/syscalls.h> |
Paul Mundt | 9bbafce | 2008-03-26 19:02:47 +0900 | [diff] [blame] | 34 | #include <asm/fpu.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| 37 | |
Paul Mundt | 3bc24a1 | 2008-05-19 13:40:12 +0900 | [diff] [blame] | 38 | struct fdpic_func_descriptor { |
| 39 | unsigned long text; |
| 40 | unsigned long GOT; |
| 41 | }; |
| 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | /* |
Carl Shaw | 2fc742f | 2009-08-24 15:07:08 +0900 | [diff] [blame] | 44 | * The following define adds a 64 byte gap between the signal |
| 45 | * stack frame and previous contents of the stack. This allows |
| 46 | * frame unwinding in a function epilogue but only if a frame |
| 47 | * pointer is used in the function. This is necessary because |
| 48 | * current gcc compilers (<4.3) do not generate unwind info on |
| 49 | * SH for function epilogues. |
| 50 | */ |
| 51 | #define UNWINDGUARD 64 |
| 52 | |
| 53 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | * Atomically swap in the new signal mask, and wait for a signal. |
| 55 | */ |
| 56 | asmlinkage int |
| 57 | sys_sigsuspend(old_sigset_t mask, |
| 58 | unsigned long r5, unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 59 | struct pt_regs __regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | mask &= _BLOCKABLE; |
| 62 | spin_lock_irq(¤t->sighand->siglock); |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 63 | current->saved_sigmask = current->blocked; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | siginitset(¤t->blocked, mask); |
| 65 | recalc_sigpending(); |
| 66 | spin_unlock_irq(¤t->sighand->siglock); |
| 67 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 68 | current->state = TASK_INTERRUPTIBLE; |
| 69 | schedule(); |
Paul Mundt | 56bfc42 | 2009-10-14 16:05:42 +0900 | [diff] [blame] | 70 | set_restore_sigmask(); |
| 71 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 72 | return -ERESTARTNOHAND; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | } |
| 74 | |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 75 | asmlinkage int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | sys_sigaction(int sig, const struct old_sigaction __user *act, |
| 77 | struct old_sigaction __user *oact) |
| 78 | { |
| 79 | struct k_sigaction new_ka, old_ka; |
| 80 | int ret; |
| 81 | |
| 82 | if (act) { |
| 83 | old_sigset_t mask; |
| 84 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || |
| 85 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || |
| 86 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) |
| 87 | return -EFAULT; |
| 88 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
| 89 | __get_user(mask, &act->sa_mask); |
| 90 | siginitset(&new_ka.sa.sa_mask, mask); |
| 91 | } |
| 92 | |
| 93 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 94 | |
| 95 | if (!ret && oact) { |
| 96 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || |
| 97 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || |
| 98 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) |
| 99 | return -EFAULT; |
| 100 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
| 101 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); |
| 102 | } |
| 103 | |
| 104 | return ret; |
| 105 | } |
| 106 | |
| 107 | asmlinkage int |
| 108 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, |
| 109 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 110 | struct pt_regs __regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | { |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 112 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
| 113 | |
| 114 | return do_sigaltstack(uss, uoss, regs->regs[15]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | |
| 118 | /* |
| 119 | * Do a signal return; undo the signal stack. |
| 120 | */ |
| 121 | |
| 122 | #define MOVW(n) (0x9300|((n)-2)) /* Move mem word at PC+n to R3 */ |
Yoshinori Sato | 11cbb70 | 2006-12-07 18:07:27 +0900 | [diff] [blame] | 123 | #if defined(CONFIG_CPU_SH2) |
Yoshinori Sato | 9d4436a | 2006-11-05 15:40:13 +0900 | [diff] [blame] | 124 | #define TRAP_NOARG 0xc320 /* Syscall w/no args (NR in R3) */ |
| 125 | #else |
| 126 | #define TRAP_NOARG 0xc310 /* Syscall w/no args (NR in R3) */ |
| 127 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | #define OR_R0_R0 0x200b /* or r0,r0 (insert to avoid hardware bug) */ |
| 129 | |
| 130 | struct sigframe |
| 131 | { |
| 132 | struct sigcontext sc; |
| 133 | unsigned long extramask[_NSIG_WORDS-1]; |
| 134 | u16 retcode[8]; |
| 135 | }; |
| 136 | |
| 137 | struct rt_sigframe |
| 138 | { |
| 139 | struct siginfo info; |
| 140 | struct ucontext uc; |
| 141 | u16 retcode[8]; |
| 142 | }; |
| 143 | |
| 144 | #ifdef CONFIG_SH_FPU |
| 145 | static inline int restore_sigcontext_fpu(struct sigcontext __user *sc) |
| 146 | { |
| 147 | struct task_struct *tsk = current; |
| 148 | |
Paul Mundt | eaa4770 | 2009-10-14 14:12:41 +0900 | [diff] [blame] | 149 | if (!(boot_cpu_data.flags & CPU_HAS_FPU)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | return 0; |
| 151 | |
| 152 | set_used_math(); |
Paul Mundt | 0ea820c | 2010-01-13 12:51:40 +0900 | [diff] [blame^] | 153 | return __copy_from_user(&tsk->thread.xstate->hardfpu, &sc->sc_fpregs[0], |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | sizeof(long)*(16*2+2)); |
| 155 | } |
| 156 | |
| 157 | static inline int save_sigcontext_fpu(struct sigcontext __user *sc, |
| 158 | struct pt_regs *regs) |
| 159 | { |
| 160 | struct task_struct *tsk = current; |
| 161 | |
Paul Mundt | eaa4770 | 2009-10-14 14:12:41 +0900 | [diff] [blame] | 162 | if (!(boot_cpu_data.flags & CPU_HAS_FPU)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | return 0; |
| 164 | |
| 165 | if (!used_math()) { |
| 166 | __put_user(0, &sc->sc_ownedfp); |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | __put_user(1, &sc->sc_ownedfp); |
| 171 | |
| 172 | /* This will cause a "finit" to be triggered by the next |
| 173 | attempted FPU operation by the 'current' process. |
| 174 | */ |
| 175 | clear_used_math(); |
| 176 | |
| 177 | unlazy_fpu(tsk, regs); |
Paul Mundt | 0ea820c | 2010-01-13 12:51:40 +0900 | [diff] [blame^] | 178 | return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.xstate->hardfpu, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | sizeof(long)*(16*2+2)); |
| 180 | } |
| 181 | #endif /* CONFIG_SH_FPU */ |
| 182 | |
| 183 | static int |
| 184 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p) |
| 185 | { |
| 186 | unsigned int err = 0; |
| 187 | |
| 188 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) |
| 189 | COPY(regs[1]); |
| 190 | COPY(regs[2]); COPY(regs[3]); |
| 191 | COPY(regs[4]); COPY(regs[5]); |
| 192 | COPY(regs[6]); COPY(regs[7]); |
| 193 | COPY(regs[8]); COPY(regs[9]); |
| 194 | COPY(regs[10]); COPY(regs[11]); |
| 195 | COPY(regs[12]); COPY(regs[13]); |
| 196 | COPY(regs[14]); COPY(regs[15]); |
| 197 | COPY(gbr); COPY(mach); |
| 198 | COPY(macl); COPY(pr); |
| 199 | COPY(sr); COPY(pc); |
| 200 | #undef COPY |
| 201 | |
| 202 | #ifdef CONFIG_SH_FPU |
Paul Mundt | eaa4770 | 2009-10-14 14:12:41 +0900 | [diff] [blame] | 203 | if (boot_cpu_data.flags & CPU_HAS_FPU) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | int owned_fp; |
| 205 | struct task_struct *tsk = current; |
| 206 | |
| 207 | regs->sr |= SR_FD; /* Release FPU */ |
| 208 | clear_fpu(tsk, regs); |
| 209 | clear_used_math(); |
| 210 | __get_user (owned_fp, &sc->sc_ownedfp); |
| 211 | if (owned_fp) |
| 212 | err |= restore_sigcontext_fpu(sc); |
| 213 | } |
| 214 | #endif |
| 215 | |
| 216 | regs->tra = -1; /* disable syscall checks */ |
| 217 | err |= __get_user(*r0_p, &sc->sc_regs[0]); |
| 218 | return err; |
| 219 | } |
| 220 | |
| 221 | asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5, |
| 222 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 223 | struct pt_regs __regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | { |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 225 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
| 226 | struct sigframe __user *frame = (struct sigframe __user *)regs->regs[15]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | sigset_t set; |
| 228 | int r0; |
| 229 | |
Paul Mundt | 1bec157 | 2008-09-24 14:37:35 +0900 | [diff] [blame] | 230 | /* Always make any pending restarted system calls return -EINTR */ |
| 231 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 232 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 234 | goto badframe; |
| 235 | |
| 236 | if (__get_user(set.sig[0], &frame->sc.oldmask) |
| 237 | || (_NSIG_WORDS > 1 |
| 238 | && __copy_from_user(&set.sig[1], &frame->extramask, |
| 239 | sizeof(frame->extramask)))) |
| 240 | goto badframe; |
| 241 | |
| 242 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 243 | |
| 244 | spin_lock_irq(¤t->sighand->siglock); |
| 245 | current->blocked = set; |
| 246 | recalc_sigpending(); |
| 247 | spin_unlock_irq(¤t->sighand->siglock); |
| 248 | |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 249 | if (restore_sigcontext(regs, &frame->sc, &r0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | goto badframe; |
| 251 | return r0; |
| 252 | |
| 253 | badframe: |
| 254 | force_sig(SIGSEGV, current); |
| 255 | return 0; |
| 256 | } |
| 257 | |
| 258 | asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5, |
| 259 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 260 | struct pt_regs __regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | { |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 262 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
| 263 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->regs[15]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | sigset_t set; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | int r0; |
| 266 | |
Paul Mundt | 1bec157 | 2008-09-24 14:37:35 +0900 | [diff] [blame] | 267 | /* Always make any pending restarted system calls return -EINTR */ |
| 268 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 269 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 271 | goto badframe; |
| 272 | |
| 273 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| 274 | goto badframe; |
| 275 | |
| 276 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 277 | spin_lock_irq(¤t->sighand->siglock); |
| 278 | current->blocked = set; |
| 279 | recalc_sigpending(); |
| 280 | spin_unlock_irq(¤t->sighand->siglock); |
| 281 | |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 282 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | goto badframe; |
| 284 | |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 285 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, |
| 286 | regs->regs[15]) == -EFAULT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | goto badframe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | |
| 289 | return r0; |
| 290 | |
| 291 | badframe: |
| 292 | force_sig(SIGSEGV, current); |
| 293 | return 0; |
Paul Mundt | 3aeb884 | 2007-06-19 12:33:21 +0900 | [diff] [blame] | 294 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | |
| 296 | /* |
| 297 | * Set up a signal frame. |
| 298 | */ |
| 299 | |
| 300 | static int |
| 301 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, |
| 302 | unsigned long mask) |
| 303 | { |
| 304 | int err = 0; |
| 305 | |
| 306 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) |
| 307 | COPY(regs[0]); COPY(regs[1]); |
| 308 | COPY(regs[2]); COPY(regs[3]); |
| 309 | COPY(regs[4]); COPY(regs[5]); |
| 310 | COPY(regs[6]); COPY(regs[7]); |
| 311 | COPY(regs[8]); COPY(regs[9]); |
| 312 | COPY(regs[10]); COPY(regs[11]); |
| 313 | COPY(regs[12]); COPY(regs[13]); |
| 314 | COPY(regs[14]); COPY(regs[15]); |
| 315 | COPY(gbr); COPY(mach); |
| 316 | COPY(macl); COPY(pr); |
| 317 | COPY(sr); COPY(pc); |
| 318 | #undef COPY |
| 319 | |
| 320 | #ifdef CONFIG_SH_FPU |
| 321 | err |= save_sigcontext_fpu(sc, regs); |
| 322 | #endif |
| 323 | |
| 324 | /* non-iBCS2 extensions.. */ |
| 325 | err |= __put_user(mask, &sc->oldmask); |
| 326 | |
| 327 | return err; |
| 328 | } |
| 329 | |
| 330 | /* |
| 331 | * Determine which stack to use.. |
| 332 | */ |
| 333 | static inline void __user * |
| 334 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) |
| 335 | { |
| 336 | if (ka->sa.sa_flags & SA_ONSTACK) { |
| 337 | if (sas_ss_flags(sp) == 0) |
| 338 | sp = current->sas_ss_sp + current->sas_ss_size; |
| 339 | } |
| 340 | |
Carl Shaw | 2fc742f | 2009-08-24 15:07:08 +0900 | [diff] [blame] | 341 | return (void __user *)((sp - (frame_size+UNWINDGUARD)) & -8ul); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | } |
| 343 | |
Paul Mundt | 19f9a34 | 2006-09-27 18:33:49 +0900 | [diff] [blame] | 344 | /* These symbols are defined with the addresses in the vsyscall page. |
| 345 | See vsyscall-trapa.S. */ |
Matt Fleming | 9445571 | 2009-06-18 10:03:33 +0100 | [diff] [blame] | 346 | extern void __kernel_sigreturn(void); |
| 347 | extern void __kernel_rt_sigreturn(void); |
Paul Mundt | 19f9a34 | 2006-09-27 18:33:49 +0900 | [diff] [blame] | 348 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 349 | static int setup_frame(int sig, struct k_sigaction *ka, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | sigset_t *set, struct pt_regs *regs) |
| 351 | { |
| 352 | struct sigframe __user *frame; |
| 353 | int err = 0; |
| 354 | int signal; |
| 355 | |
| 356 | frame = get_sigframe(ka, regs->regs[15], sizeof(*frame)); |
| 357 | |
| 358 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 359 | goto give_sigsegv; |
| 360 | |
| 361 | signal = current_thread_info()->exec_domain |
| 362 | && current_thread_info()->exec_domain->signal_invmap |
| 363 | && sig < 32 |
| 364 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 365 | : sig; |
| 366 | |
| 367 | err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); |
| 368 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 369 | if (_NSIG_WORDS > 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | err |= __copy_to_user(frame->extramask, &set->sig[1], |
| 371 | sizeof(frame->extramask)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | |
| 373 | /* Set up to return from userspace. If provided, use a stub |
| 374 | already in userspace. */ |
| 375 | if (ka->sa.sa_flags & SA_RESTORER) { |
| 376 | regs->pr = (unsigned long) ka->sa.sa_restorer; |
Paul Mundt | 19f9a34 | 2006-09-27 18:33:49 +0900 | [diff] [blame] | 377 | #ifdef CONFIG_VSYSCALL |
| 378 | } else if (likely(current->mm->context.vdso)) { |
| 379 | regs->pr = VDSO_SYM(&__kernel_sigreturn); |
| 380 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | } else { |
| 382 | /* Generate return code (system call to sigreturn) */ |
| 383 | err |= __put_user(MOVW(7), &frame->retcode[0]); |
Yoshinori Sato | 9d4436a | 2006-11-05 15:40:13 +0900 | [diff] [blame] | 384 | err |= __put_user(TRAP_NOARG, &frame->retcode[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | err |= __put_user(OR_R0_R0, &frame->retcode[2]); |
| 386 | err |= __put_user(OR_R0_R0, &frame->retcode[3]); |
| 387 | err |= __put_user(OR_R0_R0, &frame->retcode[4]); |
| 388 | err |= __put_user(OR_R0_R0, &frame->retcode[5]); |
| 389 | err |= __put_user(OR_R0_R0, &frame->retcode[6]); |
| 390 | err |= __put_user((__NR_sigreturn), &frame->retcode[7]); |
| 391 | regs->pr = (unsigned long) frame->retcode; |
Stuart Menefy | f2fb4e4 | 2008-07-02 17:51:23 +0900 | [diff] [blame] | 392 | flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | } |
| 394 | |
| 395 | if (err) |
| 396 | goto give_sigsegv; |
| 397 | |
| 398 | /* Set up registers for signal handler */ |
| 399 | regs->regs[15] = (unsigned long) frame; |
| 400 | regs->regs[4] = signal; /* Arg for signal handler */ |
| 401 | regs->regs[5] = 0; |
| 402 | regs->regs[6] = (unsigned long) &frame->sc; |
Paul Mundt | 3bc24a1 | 2008-05-19 13:40:12 +0900 | [diff] [blame] | 403 | |
| 404 | if (current->personality & FDPIC_FUNCPTRS) { |
| 405 | struct fdpic_func_descriptor __user *funcptr = |
| 406 | (struct fdpic_func_descriptor __user *)ka->sa.sa_handler; |
| 407 | |
| 408 | __get_user(regs->pc, &funcptr->text); |
| 409 | __get_user(regs->regs[12], &funcptr->GOT); |
| 410 | } else |
| 411 | regs->pc = (unsigned long)ka->sa.sa_handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
| 413 | set_fs(USER_DS); |
| 414 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 415 | pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n", |
Alexey Dobriyan | 19c5870 | 2007-10-18 23:40:41 -0700 | [diff] [blame] | 416 | current->comm, task_pid_nr(current), frame, regs->pc, regs->pr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 418 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | |
| 420 | give_sigsegv: |
| 421 | force_sigsegv(sig, current); |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 422 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | } |
| 424 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 425 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | sigset_t *set, struct pt_regs *regs) |
| 427 | { |
| 428 | struct rt_sigframe __user *frame; |
| 429 | int err = 0; |
| 430 | int signal; |
| 431 | |
| 432 | frame = get_sigframe(ka, regs->regs[15], sizeof(*frame)); |
| 433 | |
| 434 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 435 | goto give_sigsegv; |
| 436 | |
| 437 | signal = current_thread_info()->exec_domain |
| 438 | && current_thread_info()->exec_domain->signal_invmap |
| 439 | && sig < 32 |
| 440 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 441 | : sig; |
| 442 | |
| 443 | err |= copy_siginfo_to_user(&frame->info, info); |
| 444 | |
| 445 | /* Create the ucontext. */ |
| 446 | err |= __put_user(0, &frame->uc.uc_flags); |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 447 | err |= __put_user(NULL, &frame->uc.uc_link); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | err |= __put_user((void *)current->sas_ss_sp, |
| 449 | &frame->uc.uc_stack.ss_sp); |
| 450 | err |= __put_user(sas_ss_flags(regs->regs[15]), |
| 451 | &frame->uc.uc_stack.ss_flags); |
| 452 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); |
| 453 | err |= setup_sigcontext(&frame->uc.uc_mcontext, |
| 454 | regs, set->sig[0]); |
| 455 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
| 456 | |
| 457 | /* Set up to return from userspace. If provided, use a stub |
| 458 | already in userspace. */ |
| 459 | if (ka->sa.sa_flags & SA_RESTORER) { |
| 460 | regs->pr = (unsigned long) ka->sa.sa_restorer; |
Paul Mundt | 19f9a34 | 2006-09-27 18:33:49 +0900 | [diff] [blame] | 461 | #ifdef CONFIG_VSYSCALL |
| 462 | } else if (likely(current->mm->context.vdso)) { |
| 463 | regs->pr = VDSO_SYM(&__kernel_rt_sigreturn); |
| 464 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | } else { |
| 466 | /* Generate return code (system call to rt_sigreturn) */ |
| 467 | err |= __put_user(MOVW(7), &frame->retcode[0]); |
Yoshinori Sato | 9d4436a | 2006-11-05 15:40:13 +0900 | [diff] [blame] | 468 | err |= __put_user(TRAP_NOARG, &frame->retcode[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | err |= __put_user(OR_R0_R0, &frame->retcode[2]); |
| 470 | err |= __put_user(OR_R0_R0, &frame->retcode[3]); |
| 471 | err |= __put_user(OR_R0_R0, &frame->retcode[4]); |
| 472 | err |= __put_user(OR_R0_R0, &frame->retcode[5]); |
| 473 | err |= __put_user(OR_R0_R0, &frame->retcode[6]); |
| 474 | err |= __put_user((__NR_rt_sigreturn), &frame->retcode[7]); |
| 475 | regs->pr = (unsigned long) frame->retcode; |
Paul Mundt | 4d2947f | 2009-10-14 14:21:40 +0900 | [diff] [blame] | 476 | flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | } |
| 478 | |
| 479 | if (err) |
| 480 | goto give_sigsegv; |
| 481 | |
| 482 | /* Set up registers for signal handler */ |
| 483 | regs->regs[15] = (unsigned long) frame; |
| 484 | regs->regs[4] = signal; /* Arg for signal handler */ |
| 485 | regs->regs[5] = (unsigned long) &frame->info; |
| 486 | regs->regs[6] = (unsigned long) &frame->uc; |
Paul Mundt | 3bc24a1 | 2008-05-19 13:40:12 +0900 | [diff] [blame] | 487 | |
| 488 | if (current->personality & FDPIC_FUNCPTRS) { |
| 489 | struct fdpic_func_descriptor __user *funcptr = |
| 490 | (struct fdpic_func_descriptor __user *)ka->sa.sa_handler; |
| 491 | |
| 492 | __get_user(regs->pc, &funcptr->text); |
| 493 | __get_user(regs->regs[12], &funcptr->GOT); |
| 494 | } else |
| 495 | regs->pc = (unsigned long)ka->sa.sa_handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | |
| 497 | set_fs(USER_DS); |
| 498 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 499 | pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n", |
Alexey Dobriyan | 19c5870 | 2007-10-18 23:40:41 -0700 | [diff] [blame] | 500 | current->comm, task_pid_nr(current), frame, regs->pc, regs->pr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 502 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | |
| 504 | give_sigsegv: |
| 505 | force_sigsegv(sig, current); |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 506 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | } |
| 508 | |
Paul Mundt | f8b890a | 2008-09-12 22:08:20 +0900 | [diff] [blame] | 509 | static inline void |
| 510 | handle_syscall_restart(unsigned long save_r0, struct pt_regs *regs, |
| 511 | struct sigaction *sa) |
| 512 | { |
| 513 | /* If we're not from a syscall, bail out */ |
| 514 | if (regs->tra < 0) |
| 515 | return; |
| 516 | |
| 517 | /* check for system call restart.. */ |
| 518 | switch (regs->regs[0]) { |
| 519 | case -ERESTART_RESTARTBLOCK: |
| 520 | case -ERESTARTNOHAND: |
| 521 | no_system_call_restart: |
| 522 | regs->regs[0] = -EINTR; |
Paul Mundt | f8b890a | 2008-09-12 22:08:20 +0900 | [diff] [blame] | 523 | break; |
| 524 | |
| 525 | case -ERESTARTSYS: |
| 526 | if (!(sa->sa_flags & SA_RESTART)) |
| 527 | goto no_system_call_restart; |
| 528 | /* fallthrough */ |
| 529 | case -ERESTARTNOINTR: |
| 530 | regs->regs[0] = save_r0; |
| 531 | regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); |
| 532 | break; |
| 533 | } |
| 534 | } |
| 535 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | /* |
| 537 | * OK, we're invoking a handler |
| 538 | */ |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 539 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info, |
Kaz Kojima | 69a3314 | 2007-06-18 10:08:20 +0900 | [diff] [blame] | 541 | sigset_t *oldset, struct pt_regs *regs, unsigned int save_r0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | { |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 543 | int ret; |
| 544 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | /* Set up the stack frame */ |
| 546 | if (ka->sa.sa_flags & SA_SIGINFO) |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 547 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | else |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 549 | ret = setup_frame(sig, ka, oldset, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | |
| 551 | if (ka->sa.sa_flags & SA_ONESHOT) |
| 552 | ka->sa.sa_handler = SIG_DFL; |
| 553 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 554 | if (ret == 0) { |
| 555 | spin_lock_irq(¤t->sighand->siglock); |
| 556 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); |
| 557 | if (!(ka->sa.sa_flags & SA_NODEFER)) |
| 558 | sigaddset(¤t->blocked,sig); |
| 559 | recalc_sigpending(); |
| 560 | spin_unlock_irq(¤t->sighand->siglock); |
| 561 | } |
| 562 | |
| 563 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | } |
| 565 | |
| 566 | /* |
| 567 | * Note that 'init' is a special process: it doesn't get signals it doesn't |
| 568 | * want to handle. Thus you cannot kill init even with a SIGKILL even by |
| 569 | * mistake. |
| 570 | * |
| 571 | * Note that we go through the signals twice: once to check the signals that |
| 572 | * the kernel can handle, and then we build all the user-level signal handling |
| 573 | * stack-frames in one go after that. |
| 574 | */ |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 575 | static void do_signal(struct pt_regs *regs, unsigned int save_r0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | { |
| 577 | siginfo_t info; |
| 578 | int signr; |
| 579 | struct k_sigaction ka; |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 580 | sigset_t *oldset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | |
| 582 | /* |
| 583 | * We want the common case to go fast, which |
| 584 | * is why we may in certain cases get here from |
| 585 | * kernel mode. Just return without doing anything |
| 586 | * if so. |
| 587 | */ |
| 588 | if (!user_mode(regs)) |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 589 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | |
Nigel Cunningham | 0e6c1f5 | 2005-07-27 11:43:34 -0700 | [diff] [blame] | 591 | if (try_to_freeze()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | goto no_signal; |
| 593 | |
Paul Mundt | 56bfc42 | 2009-10-14 16:05:42 +0900 | [diff] [blame] | 594 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 595 | oldset = ¤t->saved_sigmask; |
| 596 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | oldset = ¤t->blocked; |
| 598 | |
| 599 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
| 600 | if (signr > 0) { |
Paul Mundt | 03f0787 | 2009-01-29 11:21:38 +0900 | [diff] [blame] | 601 | handle_syscall_restart(save_r0, regs, &ka.sa); |
Paul Mundt | f8b890a | 2008-09-12 22:08:20 +0900 | [diff] [blame] | 602 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | /* Whee! Actually deliver the signal. */ |
Paul Mundt | 3aeb884 | 2007-06-19 12:33:21 +0900 | [diff] [blame] | 604 | if (handle_signal(signr, &ka, &info, oldset, |
| 605 | regs, save_r0) == 0) { |
Paul Mundt | 56bfc42 | 2009-10-14 16:05:42 +0900 | [diff] [blame] | 606 | /* |
| 607 | * A signal was successfully delivered; the saved |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 608 | * sigmask will have been stored in the signal frame, |
| 609 | * and will be restored by sigreturn, so we can simply |
Paul Mundt | 56bfc42 | 2009-10-14 16:05:42 +0900 | [diff] [blame] | 610 | * clear the TS_RESTORE_SIGMASK flag |
| 611 | */ |
| 612 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; |
Paul Mundt | ab99c73 | 2008-07-30 19:55:30 +0900 | [diff] [blame] | 613 | |
| 614 | tracehook_signal_handler(signr, &info, &ka, regs, |
| 615 | test_thread_flag(TIF_SINGLESTEP)); |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 616 | } |
Ryusuke Sakato | c8bfa1f | 2007-02-23 13:22:56 +0900 | [diff] [blame] | 617 | |
| 618 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | } |
| 620 | |
Paul Mundt | ab99c73 | 2008-07-30 19:55:30 +0900 | [diff] [blame] | 621 | no_signal: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | /* Did we come from a system call? */ |
| 623 | if (regs->tra >= 0) { |
| 624 | /* Restart the system call - no handlers present */ |
| 625 | if (regs->regs[0] == -ERESTARTNOHAND || |
| 626 | regs->regs[0] == -ERESTARTSYS || |
Paul Mundt | 0b89293 | 2006-09-27 17:22:49 +0900 | [diff] [blame] | 627 | regs->regs[0] == -ERESTARTNOINTR) { |
Ryusuke Sakato | c8bfa1f | 2007-02-23 13:22:56 +0900 | [diff] [blame] | 628 | regs->regs[0] = save_r0; |
Paul Mundt | 53f983a | 2007-05-08 15:31:48 +0900 | [diff] [blame] | 629 | regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); |
Paul Mundt | 0b89293 | 2006-09-27 17:22:49 +0900 | [diff] [blame] | 630 | } else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) { |
Paul Mundt | 53f983a | 2007-05-08 15:31:48 +0900 | [diff] [blame] | 631 | regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); |
Paul Mundt | 0b89293 | 2006-09-27 17:22:49 +0900 | [diff] [blame] | 632 | regs->regs[3] = __NR_restart_syscall; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | } |
| 634 | } |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 635 | |
Paul Mundt | 56bfc42 | 2009-10-14 16:05:42 +0900 | [diff] [blame] | 636 | /* |
| 637 | * If there's no signal to deliver, we just put the saved sigmask |
| 638 | * back. |
| 639 | */ |
| 640 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) { |
| 641 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 642 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); |
| 643 | } |
| 644 | } |
| 645 | |
| 646 | asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0, |
Paul Mundt | ab99c73 | 2008-07-30 19:55:30 +0900 | [diff] [blame] | 647 | unsigned long thread_info_flags) |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 648 | { |
| 649 | /* deal with pending signal delivery */ |
Paul Mundt | ab99c73 | 2008-07-30 19:55:30 +0900 | [diff] [blame] | 650 | if (thread_info_flags & _TIF_SIGPENDING) |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 651 | do_signal(regs, save_r0); |
Paul Mundt | ab99c73 | 2008-07-30 19:55:30 +0900 | [diff] [blame] | 652 | |
| 653 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { |
| 654 | clear_thread_flag(TIF_NOTIFY_RESUME); |
| 655 | tracehook_notify_resume(regs); |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 656 | if (current->replacement_session_keyring) |
| 657 | key_replace_session_keyring(); |
Paul Mundt | ab99c73 | 2008-07-30 19:55:30 +0900 | [diff] [blame] | 658 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | } |