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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <asm/ucontext.h> |
| 29 | #include <asm/uaccess.h> |
| 30 | #include <asm/pgtable.h> |
| 31 | #include <asm/cacheflush.h> |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 32 | #include <asm/syscalls.h> |
Paul Mundt | 9bbafce | 2008-03-26 19:02:47 +0900 | [diff] [blame] | 33 | #include <asm/fpu.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| 36 | |
Paul Mundt | 3bc24a1 | 2008-05-19 13:40:12 +0900 | [diff] [blame] | 37 | struct fdpic_func_descriptor { |
| 38 | unsigned long text; |
| 39 | unsigned long GOT; |
| 40 | }; |
| 41 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | /* |
Carl Shaw | 2fc742f | 2009-08-24 15:07:08 +0900 | [diff] [blame] | 43 | * The following define adds a 64 byte gap between the signal |
| 44 | * stack frame and previous contents of the stack. This allows |
| 45 | * frame unwinding in a function epilogue but only if a frame |
| 46 | * pointer is used in the function. This is necessary because |
| 47 | * current gcc compilers (<4.3) do not generate unwind info on |
| 48 | * SH for function epilogues. |
| 49 | */ |
| 50 | #define UNWINDGUARD 64 |
| 51 | |
| 52 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | * Atomically swap in the new signal mask, and wait for a signal. |
| 54 | */ |
| 55 | asmlinkage int |
Al Viro | 9ef461a | 2012-04-22 01:16:34 -0400 | [diff] [blame] | 56 | sys_sigsuspend(old_sigset_t mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | { |
Matt Fleming | 5e047fa | 2012-03-28 15:16:32 -0700 | [diff] [blame] | 58 | sigset_t blocked; |
Matt Fleming | 5e047fa | 2012-03-28 15:16:32 -0700 | [diff] [blame] | 59 | siginitset(&blocked, mask); |
Al Viro | 68f3f16 | 2012-05-21 21:42:32 -0400 | [diff] [blame] | 60 | return sigsuspend(&blocked); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | } |
| 62 | |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 63 | asmlinkage int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | sys_sigaction(int sig, const struct old_sigaction __user *act, |
| 65 | struct old_sigaction __user *oact) |
| 66 | { |
| 67 | struct k_sigaction new_ka, old_ka; |
| 68 | int ret; |
| 69 | |
| 70 | if (act) { |
| 71 | old_sigset_t mask; |
| 72 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || |
| 73 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || |
Al Viro | a46808e | 2012-04-22 16:59:56 -0400 | [diff] [blame] | 74 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) || |
| 75 | __get_user(new_ka.sa.sa_flags, &act->sa_flags) || |
| 76 | __get_user(mask, &act->sa_mask)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | siginitset(&new_ka.sa.sa_mask, mask); |
| 79 | } |
| 80 | |
| 81 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 82 | |
| 83 | if (!ret && oact) { |
| 84 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || |
| 85 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || |
Al Viro | a46808e | 2012-04-22 16:59:56 -0400 | [diff] [blame] | 86 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) || |
| 87 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || |
| 88 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | } |
| 91 | |
| 92 | return ret; |
| 93 | } |
| 94 | |
| 95 | asmlinkage int |
| 96 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, |
| 97 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 98 | struct pt_regs __regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | { |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 100 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
| 101 | |
| 102 | return do_sigaltstack(uss, uoss, regs->regs[15]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | } |
| 104 | |
| 105 | |
| 106 | /* |
| 107 | * Do a signal return; undo the signal stack. |
| 108 | */ |
| 109 | |
| 110 | #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] | 111 | #if defined(CONFIG_CPU_SH2) |
Yoshinori Sato | 9d4436a | 2006-11-05 15:40:13 +0900 | [diff] [blame] | 112 | #define TRAP_NOARG 0xc320 /* Syscall w/no args (NR in R3) */ |
| 113 | #else |
| 114 | #define TRAP_NOARG 0xc310 /* Syscall w/no args (NR in R3) */ |
| 115 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | #define OR_R0_R0 0x200b /* or r0,r0 (insert to avoid hardware bug) */ |
| 117 | |
| 118 | struct sigframe |
| 119 | { |
| 120 | struct sigcontext sc; |
| 121 | unsigned long extramask[_NSIG_WORDS-1]; |
| 122 | u16 retcode[8]; |
| 123 | }; |
| 124 | |
| 125 | struct rt_sigframe |
| 126 | { |
| 127 | struct siginfo info; |
| 128 | struct ucontext uc; |
| 129 | u16 retcode[8]; |
| 130 | }; |
| 131 | |
| 132 | #ifdef CONFIG_SH_FPU |
| 133 | static inline int restore_sigcontext_fpu(struct sigcontext __user *sc) |
| 134 | { |
| 135 | struct task_struct *tsk = current; |
| 136 | |
Paul Mundt | eaa4770 | 2009-10-14 14:12:41 +0900 | [diff] [blame] | 137 | if (!(boot_cpu_data.flags & CPU_HAS_FPU)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | return 0; |
| 139 | |
| 140 | set_used_math(); |
Paul Mundt | 0ea820c | 2010-01-13 12:51:40 +0900 | [diff] [blame] | 141 | return __copy_from_user(&tsk->thread.xstate->hardfpu, &sc->sc_fpregs[0], |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | sizeof(long)*(16*2+2)); |
| 143 | } |
| 144 | |
| 145 | static inline int save_sigcontext_fpu(struct sigcontext __user *sc, |
| 146 | struct pt_regs *regs) |
| 147 | { |
| 148 | struct task_struct *tsk = current; |
| 149 | |
Paul Mundt | eaa4770 | 2009-10-14 14:12:41 +0900 | [diff] [blame] | 150 | if (!(boot_cpu_data.flags & CPU_HAS_FPU)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | return 0; |
| 152 | |
Al Viro | a46808e | 2012-04-22 16:59:56 -0400 | [diff] [blame] | 153 | if (!used_math()) |
| 154 | return __put_user(0, &sc->sc_ownedfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Al Viro | a46808e | 2012-04-22 16:59:56 -0400 | [diff] [blame] | 156 | if (__put_user(1, &sc->sc_ownedfp)) |
| 157 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
| 159 | /* This will cause a "finit" to be triggered by the next |
| 160 | attempted FPU operation by the 'current' process. |
| 161 | */ |
| 162 | clear_used_math(); |
| 163 | |
| 164 | unlazy_fpu(tsk, regs); |
Paul Mundt | 0ea820c | 2010-01-13 12:51:40 +0900 | [diff] [blame] | 165 | return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.xstate->hardfpu, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | sizeof(long)*(16*2+2)); |
| 167 | } |
| 168 | #endif /* CONFIG_SH_FPU */ |
| 169 | |
| 170 | static int |
| 171 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p) |
| 172 | { |
| 173 | unsigned int err = 0; |
| 174 | |
| 175 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) |
| 176 | COPY(regs[1]); |
| 177 | COPY(regs[2]); COPY(regs[3]); |
| 178 | COPY(regs[4]); COPY(regs[5]); |
| 179 | COPY(regs[6]); COPY(regs[7]); |
| 180 | COPY(regs[8]); COPY(regs[9]); |
| 181 | COPY(regs[10]); COPY(regs[11]); |
| 182 | COPY(regs[12]); COPY(regs[13]); |
| 183 | COPY(regs[14]); COPY(regs[15]); |
| 184 | COPY(gbr); COPY(mach); |
| 185 | COPY(macl); COPY(pr); |
| 186 | COPY(sr); COPY(pc); |
| 187 | #undef COPY |
| 188 | |
| 189 | #ifdef CONFIG_SH_FPU |
Paul Mundt | eaa4770 | 2009-10-14 14:12:41 +0900 | [diff] [blame] | 190 | if (boot_cpu_data.flags & CPU_HAS_FPU) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | int owned_fp; |
| 192 | struct task_struct *tsk = current; |
| 193 | |
| 194 | regs->sr |= SR_FD; /* Release FPU */ |
| 195 | clear_fpu(tsk, regs); |
| 196 | clear_used_math(); |
Al Viro | a46808e | 2012-04-22 16:59:56 -0400 | [diff] [blame] | 197 | err |= __get_user (owned_fp, &sc->sc_ownedfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | if (owned_fp) |
| 199 | err |= restore_sigcontext_fpu(sc); |
| 200 | } |
| 201 | #endif |
| 202 | |
| 203 | regs->tra = -1; /* disable syscall checks */ |
| 204 | err |= __get_user(*r0_p, &sc->sc_regs[0]); |
| 205 | return err; |
| 206 | } |
| 207 | |
| 208 | asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5, |
| 209 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 210 | struct pt_regs __regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | { |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 212 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
| 213 | struct sigframe __user *frame = (struct sigframe __user *)regs->regs[15]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | sigset_t set; |
| 215 | int r0; |
| 216 | |
Paul Mundt | 1bec157 | 2008-09-24 14:37:35 +0900 | [diff] [blame] | 217 | /* Always make any pending restarted system calls return -EINTR */ |
| 218 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 219 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 221 | goto badframe; |
| 222 | |
| 223 | if (__get_user(set.sig[0], &frame->sc.oldmask) |
| 224 | || (_NSIG_WORDS > 1 |
| 225 | && __copy_from_user(&set.sig[1], &frame->extramask, |
| 226 | sizeof(frame->extramask)))) |
| 227 | goto badframe; |
| 228 | |
| 229 | sigdelsetmask(&set, ~_BLOCKABLE); |
Matt Fleming | 5e047fa | 2012-03-28 15:16:32 -0700 | [diff] [blame] | 230 | set_current_blocked(&set); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 232 | if (restore_sigcontext(regs, &frame->sc, &r0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | goto badframe; |
| 234 | return r0; |
| 235 | |
| 236 | badframe: |
| 237 | force_sig(SIGSEGV, current); |
| 238 | return 0; |
| 239 | } |
| 240 | |
| 241 | asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5, |
| 242 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 243 | struct pt_regs __regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | { |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 245 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
| 246 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->regs[15]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | sigset_t set; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | int r0; |
| 249 | |
Paul Mundt | 1bec157 | 2008-09-24 14:37:35 +0900 | [diff] [blame] | 250 | /* Always make any pending restarted system calls return -EINTR */ |
| 251 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 252 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 254 | goto badframe; |
| 255 | |
| 256 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| 257 | goto badframe; |
| 258 | |
| 259 | sigdelsetmask(&set, ~_BLOCKABLE); |
Matt Fleming | 5e047fa | 2012-03-28 15:16:32 -0700 | [diff] [blame] | 260 | set_current_blocked(&set); |
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 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | goto badframe; |
| 264 | |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 265 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, |
| 266 | regs->regs[15]) == -EFAULT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | goto badframe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
| 269 | return r0; |
| 270 | |
| 271 | badframe: |
| 272 | force_sig(SIGSEGV, current); |
| 273 | return 0; |
Paul Mundt | 3aeb884 | 2007-06-19 12:33:21 +0900 | [diff] [blame] | 274 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
| 276 | /* |
| 277 | * Set up a signal frame. |
| 278 | */ |
| 279 | |
| 280 | static int |
| 281 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, |
| 282 | unsigned long mask) |
| 283 | { |
| 284 | int err = 0; |
| 285 | |
| 286 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) |
| 287 | COPY(regs[0]); COPY(regs[1]); |
| 288 | COPY(regs[2]); COPY(regs[3]); |
| 289 | COPY(regs[4]); COPY(regs[5]); |
| 290 | COPY(regs[6]); COPY(regs[7]); |
| 291 | COPY(regs[8]); COPY(regs[9]); |
| 292 | COPY(regs[10]); COPY(regs[11]); |
| 293 | COPY(regs[12]); COPY(regs[13]); |
| 294 | COPY(regs[14]); COPY(regs[15]); |
| 295 | COPY(gbr); COPY(mach); |
| 296 | COPY(macl); COPY(pr); |
| 297 | COPY(sr); COPY(pc); |
| 298 | #undef COPY |
| 299 | |
| 300 | #ifdef CONFIG_SH_FPU |
| 301 | err |= save_sigcontext_fpu(sc, regs); |
| 302 | #endif |
| 303 | |
| 304 | /* non-iBCS2 extensions.. */ |
| 305 | err |= __put_user(mask, &sc->oldmask); |
| 306 | |
| 307 | return err; |
| 308 | } |
| 309 | |
| 310 | /* |
| 311 | * Determine which stack to use.. |
| 312 | */ |
| 313 | static inline void __user * |
| 314 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) |
| 315 | { |
| 316 | if (ka->sa.sa_flags & SA_ONSTACK) { |
| 317 | if (sas_ss_flags(sp) == 0) |
| 318 | sp = current->sas_ss_sp + current->sas_ss_size; |
| 319 | } |
| 320 | |
Carl Shaw | 2fc742f | 2009-08-24 15:07:08 +0900 | [diff] [blame] | 321 | return (void __user *)((sp - (frame_size+UNWINDGUARD)) & -8ul); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | } |
| 323 | |
Paul Mundt | 19f9a34 | 2006-09-27 18:33:49 +0900 | [diff] [blame] | 324 | /* These symbols are defined with the addresses in the vsyscall page. |
| 325 | See vsyscall-trapa.S. */ |
Matt Fleming | 9445571 | 2009-06-18 10:03:33 +0100 | [diff] [blame] | 326 | extern void __kernel_sigreturn(void); |
| 327 | extern void __kernel_rt_sigreturn(void); |
Paul Mundt | 19f9a34 | 2006-09-27 18:33:49 +0900 | [diff] [blame] | 328 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 329 | static int setup_frame(int sig, struct k_sigaction *ka, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | sigset_t *set, struct pt_regs *regs) |
| 331 | { |
| 332 | struct sigframe __user *frame; |
| 333 | int err = 0; |
| 334 | int signal; |
| 335 | |
| 336 | frame = get_sigframe(ka, regs->regs[15], sizeof(*frame)); |
| 337 | |
| 338 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 339 | goto give_sigsegv; |
| 340 | |
| 341 | signal = current_thread_info()->exec_domain |
| 342 | && current_thread_info()->exec_domain->signal_invmap |
| 343 | && sig < 32 |
| 344 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 345 | : sig; |
| 346 | |
| 347 | err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); |
| 348 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 349 | if (_NSIG_WORDS > 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | err |= __copy_to_user(frame->extramask, &set->sig[1], |
| 351 | sizeof(frame->extramask)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | |
| 353 | /* Set up to return from userspace. If provided, use a stub |
| 354 | already in userspace. */ |
| 355 | if (ka->sa.sa_flags & SA_RESTORER) { |
| 356 | regs->pr = (unsigned long) ka->sa.sa_restorer; |
Paul Mundt | 19f9a34 | 2006-09-27 18:33:49 +0900 | [diff] [blame] | 357 | #ifdef CONFIG_VSYSCALL |
| 358 | } else if (likely(current->mm->context.vdso)) { |
| 359 | regs->pr = VDSO_SYM(&__kernel_sigreturn); |
| 360 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | } else { |
| 362 | /* Generate return code (system call to sigreturn) */ |
| 363 | err |= __put_user(MOVW(7), &frame->retcode[0]); |
Yoshinori Sato | 9d4436a | 2006-11-05 15:40:13 +0900 | [diff] [blame] | 364 | err |= __put_user(TRAP_NOARG, &frame->retcode[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | err |= __put_user(OR_R0_R0, &frame->retcode[2]); |
| 366 | err |= __put_user(OR_R0_R0, &frame->retcode[3]); |
| 367 | err |= __put_user(OR_R0_R0, &frame->retcode[4]); |
| 368 | err |= __put_user(OR_R0_R0, &frame->retcode[5]); |
| 369 | err |= __put_user(OR_R0_R0, &frame->retcode[6]); |
| 370 | err |= __put_user((__NR_sigreturn), &frame->retcode[7]); |
| 371 | regs->pr = (unsigned long) frame->retcode; |
Stuart Menefy | f2fb4e4 | 2008-07-02 17:51:23 +0900 | [diff] [blame] | 372 | flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | } |
| 374 | |
| 375 | if (err) |
| 376 | goto give_sigsegv; |
| 377 | |
| 378 | /* Set up registers for signal handler */ |
| 379 | regs->regs[15] = (unsigned long) frame; |
| 380 | regs->regs[4] = signal; /* Arg for signal handler */ |
| 381 | regs->regs[5] = 0; |
| 382 | regs->regs[6] = (unsigned long) &frame->sc; |
Paul Mundt | 3bc24a1 | 2008-05-19 13:40:12 +0900 | [diff] [blame] | 383 | |
| 384 | if (current->personality & FDPIC_FUNCPTRS) { |
| 385 | struct fdpic_func_descriptor __user *funcptr = |
| 386 | (struct fdpic_func_descriptor __user *)ka->sa.sa_handler; |
| 387 | |
Al Viro | a46808e | 2012-04-22 16:59:56 -0400 | [diff] [blame] | 388 | err |= __get_user(regs->pc, &funcptr->text); |
| 389 | err |= __get_user(regs->regs[12], &funcptr->GOT); |
Paul Mundt | 3bc24a1 | 2008-05-19 13:40:12 +0900 | [diff] [blame] | 390 | } else |
| 391 | regs->pc = (unsigned long)ka->sa.sa_handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
Al Viro | a46808e | 2012-04-22 16:59:56 -0400 | [diff] [blame] | 393 | if (err) |
| 394 | goto give_sigsegv; |
| 395 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | set_fs(USER_DS); |
| 397 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 398 | 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] | 399 | current->comm, task_pid_nr(current), frame, regs->pc, regs->pr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 401 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | |
| 403 | give_sigsegv: |
| 404 | force_sigsegv(sig, current); |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 405 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | } |
| 407 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 408 | 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] | 409 | sigset_t *set, struct pt_regs *regs) |
| 410 | { |
| 411 | struct rt_sigframe __user *frame; |
| 412 | int err = 0; |
| 413 | int signal; |
| 414 | |
| 415 | frame = get_sigframe(ka, regs->regs[15], sizeof(*frame)); |
| 416 | |
| 417 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 418 | goto give_sigsegv; |
| 419 | |
| 420 | signal = current_thread_info()->exec_domain |
| 421 | && current_thread_info()->exec_domain->signal_invmap |
| 422 | && sig < 32 |
| 423 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 424 | : sig; |
| 425 | |
| 426 | err |= copy_siginfo_to_user(&frame->info, info); |
| 427 | |
| 428 | /* Create the ucontext. */ |
| 429 | err |= __put_user(0, &frame->uc.uc_flags); |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 430 | err |= __put_user(NULL, &frame->uc.uc_link); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | err |= __put_user((void *)current->sas_ss_sp, |
| 432 | &frame->uc.uc_stack.ss_sp); |
| 433 | err |= __put_user(sas_ss_flags(regs->regs[15]), |
| 434 | &frame->uc.uc_stack.ss_flags); |
| 435 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); |
| 436 | err |= setup_sigcontext(&frame->uc.uc_mcontext, |
| 437 | regs, set->sig[0]); |
| 438 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
| 439 | |
| 440 | /* Set up to return from userspace. If provided, use a stub |
| 441 | already in userspace. */ |
| 442 | if (ka->sa.sa_flags & SA_RESTORER) { |
| 443 | regs->pr = (unsigned long) ka->sa.sa_restorer; |
Paul Mundt | 19f9a34 | 2006-09-27 18:33:49 +0900 | [diff] [blame] | 444 | #ifdef CONFIG_VSYSCALL |
| 445 | } else if (likely(current->mm->context.vdso)) { |
| 446 | regs->pr = VDSO_SYM(&__kernel_rt_sigreturn); |
| 447 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | } else { |
| 449 | /* Generate return code (system call to rt_sigreturn) */ |
| 450 | err |= __put_user(MOVW(7), &frame->retcode[0]); |
Yoshinori Sato | 9d4436a | 2006-11-05 15:40:13 +0900 | [diff] [blame] | 451 | err |= __put_user(TRAP_NOARG, &frame->retcode[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | err |= __put_user(OR_R0_R0, &frame->retcode[2]); |
| 453 | err |= __put_user(OR_R0_R0, &frame->retcode[3]); |
| 454 | err |= __put_user(OR_R0_R0, &frame->retcode[4]); |
| 455 | err |= __put_user(OR_R0_R0, &frame->retcode[5]); |
| 456 | err |= __put_user(OR_R0_R0, &frame->retcode[6]); |
| 457 | err |= __put_user((__NR_rt_sigreturn), &frame->retcode[7]); |
| 458 | regs->pr = (unsigned long) frame->retcode; |
Paul Mundt | 4d2947f | 2009-10-14 14:21:40 +0900 | [diff] [blame] | 459 | flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | } |
| 461 | |
| 462 | if (err) |
| 463 | goto give_sigsegv; |
| 464 | |
| 465 | /* Set up registers for signal handler */ |
| 466 | regs->regs[15] = (unsigned long) frame; |
| 467 | regs->regs[4] = signal; /* Arg for signal handler */ |
| 468 | regs->regs[5] = (unsigned long) &frame->info; |
| 469 | regs->regs[6] = (unsigned long) &frame->uc; |
Paul Mundt | 3bc24a1 | 2008-05-19 13:40:12 +0900 | [diff] [blame] | 470 | |
| 471 | if (current->personality & FDPIC_FUNCPTRS) { |
| 472 | struct fdpic_func_descriptor __user *funcptr = |
| 473 | (struct fdpic_func_descriptor __user *)ka->sa.sa_handler; |
| 474 | |
Al Viro | a46808e | 2012-04-22 16:59:56 -0400 | [diff] [blame] | 475 | err |= __get_user(regs->pc, &funcptr->text); |
| 476 | err |= __get_user(regs->regs[12], &funcptr->GOT); |
Paul Mundt | 3bc24a1 | 2008-05-19 13:40:12 +0900 | [diff] [blame] | 477 | } else |
| 478 | regs->pc = (unsigned long)ka->sa.sa_handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | |
Al Viro | a46808e | 2012-04-22 16:59:56 -0400 | [diff] [blame] | 480 | if (err) |
| 481 | goto give_sigsegv; |
| 482 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | set_fs(USER_DS); |
| 484 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 485 | 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] | 486 | current->comm, task_pid_nr(current), frame, regs->pc, regs->pr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 488 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
| 490 | give_sigsegv: |
| 491 | force_sigsegv(sig, current); |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 492 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | } |
| 494 | |
Paul Mundt | f8b890a | 2008-09-12 22:08:20 +0900 | [diff] [blame] | 495 | static inline void |
| 496 | handle_syscall_restart(unsigned long save_r0, struct pt_regs *regs, |
| 497 | struct sigaction *sa) |
| 498 | { |
| 499 | /* If we're not from a syscall, bail out */ |
| 500 | if (regs->tra < 0) |
| 501 | return; |
| 502 | |
| 503 | /* check for system call restart.. */ |
| 504 | switch (regs->regs[0]) { |
| 505 | case -ERESTART_RESTARTBLOCK: |
| 506 | case -ERESTARTNOHAND: |
| 507 | no_system_call_restart: |
| 508 | regs->regs[0] = -EINTR; |
Paul Mundt | f8b890a | 2008-09-12 22:08:20 +0900 | [diff] [blame] | 509 | break; |
| 510 | |
| 511 | case -ERESTARTSYS: |
| 512 | if (!(sa->sa_flags & SA_RESTART)) |
| 513 | goto no_system_call_restart; |
| 514 | /* fallthrough */ |
| 515 | case -ERESTARTNOINTR: |
| 516 | regs->regs[0] = save_r0; |
Paul Mundt | 9d56dd3 | 2010-01-26 12:58:40 +0900 | [diff] [blame] | 517 | regs->pc -= instruction_size(__raw_readw(regs->pc - 4)); |
Paul Mundt | f8b890a | 2008-09-12 22:08:20 +0900 | [diff] [blame] | 518 | break; |
| 519 | } |
| 520 | } |
| 521 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | /* |
| 523 | * OK, we're invoking a handler |
| 524 | */ |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 525 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info, |
Al Viro | b7f9a11 | 2012-05-02 09:59:21 -0400 | [diff] [blame^] | 527 | struct pt_regs *regs, unsigned int save_r0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | { |
Al Viro | b7f9a11 | 2012-05-02 09:59:21 -0400 | [diff] [blame^] | 529 | sigset_t *oldset = sigmask_to_save(); |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 530 | int ret; |
| 531 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | /* Set up the stack frame */ |
| 533 | if (ka->sa.sa_flags & SA_SIGINFO) |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 534 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | else |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 536 | ret = setup_frame(sig, ka, oldset, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
Matt Fleming | 5e047fa | 2012-03-28 15:16:32 -0700 | [diff] [blame] | 538 | if (ret == 0) |
| 539 | block_sigmask(ka, sig); |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 540 | |
| 541 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | } |
| 543 | |
| 544 | /* |
| 545 | * Note that 'init' is a special process: it doesn't get signals it doesn't |
| 546 | * want to handle. Thus you cannot kill init even with a SIGKILL even by |
| 547 | * mistake. |
| 548 | * |
| 549 | * Note that we go through the signals twice: once to check the signals that |
| 550 | * the kernel can handle, and then we build all the user-level signal handling |
| 551 | * stack-frames in one go after that. |
| 552 | */ |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 553 | static void do_signal(struct pt_regs *regs, unsigned int save_r0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | { |
| 555 | siginfo_t info; |
| 556 | int signr; |
| 557 | struct k_sigaction ka; |
| 558 | |
| 559 | /* |
| 560 | * We want the common case to go fast, which |
| 561 | * is why we may in certain cases get here from |
| 562 | * kernel mode. Just return without doing anything |
| 563 | * if so. |
| 564 | */ |
| 565 | if (!user_mode(regs)) |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 566 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
| 569 | if (signr > 0) { |
Paul Mundt | 03f0787 | 2009-01-29 11:21:38 +0900 | [diff] [blame] | 570 | handle_syscall_restart(save_r0, regs, &ka.sa); |
Paul Mundt | f8b890a | 2008-09-12 22:08:20 +0900 | [diff] [blame] | 571 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | /* Whee! Actually deliver the signal. */ |
Al Viro | b7f9a11 | 2012-05-02 09:59:21 -0400 | [diff] [blame^] | 573 | if (handle_signal(signr, &ka, &info, |
Paul Mundt | 3aeb884 | 2007-06-19 12:33:21 +0900 | [diff] [blame] | 574 | regs, save_r0) == 0) { |
Paul Mundt | 56bfc42 | 2009-10-14 16:05:42 +0900 | [diff] [blame] | 575 | /* |
| 576 | * A signal was successfully delivered; the saved |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 577 | * sigmask will have been stored in the signal frame, |
| 578 | * and will be restored by sigreturn, so we can simply |
Paul Mundt | 56bfc42 | 2009-10-14 16:05:42 +0900 | [diff] [blame] | 579 | * clear the TS_RESTORE_SIGMASK flag |
| 580 | */ |
| 581 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; |
Paul Mundt | ab99c73 | 2008-07-30 19:55:30 +0900 | [diff] [blame] | 582 | |
| 583 | tracehook_signal_handler(signr, &info, &ka, regs, |
| 584 | test_thread_flag(TIF_SINGLESTEP)); |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 585 | } |
Ryusuke Sakato | c8bfa1f | 2007-02-23 13:22:56 +0900 | [diff] [blame] | 586 | |
| 587 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | } |
| 589 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | /* Did we come from a system call? */ |
| 591 | if (regs->tra >= 0) { |
| 592 | /* Restart the system call - no handlers present */ |
| 593 | if (regs->regs[0] == -ERESTARTNOHAND || |
| 594 | regs->regs[0] == -ERESTARTSYS || |
Paul Mundt | 0b89293 | 2006-09-27 17:22:49 +0900 | [diff] [blame] | 595 | regs->regs[0] == -ERESTARTNOINTR) { |
Ryusuke Sakato | c8bfa1f | 2007-02-23 13:22:56 +0900 | [diff] [blame] | 596 | regs->regs[0] = save_r0; |
Paul Mundt | 9d56dd3 | 2010-01-26 12:58:40 +0900 | [diff] [blame] | 597 | regs->pc -= instruction_size(__raw_readw(regs->pc - 4)); |
Paul Mundt | 0b89293 | 2006-09-27 17:22:49 +0900 | [diff] [blame] | 598 | } else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) { |
Paul Mundt | 9d56dd3 | 2010-01-26 12:58:40 +0900 | [diff] [blame] | 599 | regs->pc -= instruction_size(__raw_readw(regs->pc - 4)); |
Paul Mundt | 0b89293 | 2006-09-27 17:22:49 +0900 | [diff] [blame] | 600 | regs->regs[3] = __NR_restart_syscall; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | } |
| 602 | } |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 603 | |
Paul Mundt | 56bfc42 | 2009-10-14 16:05:42 +0900 | [diff] [blame] | 604 | /* |
| 605 | * If there's no signal to deliver, we just put the saved sigmask |
| 606 | * back. |
| 607 | */ |
Al Viro | 51a7b44 | 2012-05-21 23:33:55 -0400 | [diff] [blame] | 608 | restore_saved_sigmask(); |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 609 | } |
| 610 | |
| 611 | 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] | 612 | unsigned long thread_info_flags) |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 613 | { |
| 614 | /* deal with pending signal delivery */ |
Paul Mundt | ab99c73 | 2008-07-30 19:55:30 +0900 | [diff] [blame] | 615 | if (thread_info_flags & _TIF_SIGPENDING) |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 616 | do_signal(regs, save_r0); |
Paul Mundt | ab99c73 | 2008-07-30 19:55:30 +0900 | [diff] [blame] | 617 | |
| 618 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { |
| 619 | clear_thread_flag(TIF_NOTIFY_RESUME); |
| 620 | tracehook_notify_resume(regs); |
| 621 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | } |