Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/kernel/signal.c |
| 3 | * |
Russell King | ab72b00 | 2009-10-25 15:39:37 +0000 | [diff] [blame] | 4 | * Copyright (C) 1995-2009 Russell King |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/errno.h> |
| 11 | #include <linux/signal.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/personality.h> |
Nigel Cunningham | 7dfb710 | 2006-12-06 20:34:23 -0800 | [diff] [blame] | 13 | #include <linux/freezer.h> |
Russell King | 33fa9b1 | 2008-09-06 11:35:55 +0100 | [diff] [blame] | 14 | #include <linux/uaccess.h> |
David Howells | 733e5e4 | 2009-09-09 08:30:21 +0100 | [diff] [blame] | 15 | #include <linux/tracehook.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
Russell King | ee90dab | 2006-11-09 14:20:47 +0000 | [diff] [blame] | 17 | #include <asm/elf.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <asm/cacheflush.h> |
| 19 | #include <asm/ucontext.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <asm/unistd.h> |
Imre Deak | 82c6f5a | 2010-04-11 15:58:27 +0100 | [diff] [blame] | 21 | #include <asm/vfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
Russell King | e00d349 | 2005-06-22 20:26:05 +0100 | [diff] [blame] | 23 | #include "signal.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| 26 | |
| 27 | /* |
| 28 | * For ARM syscalls, we encode the syscall number into the instruction. |
| 29 | */ |
janboe | ee4cd58 | 2008-03-19 03:34:23 +0100 | [diff] [blame] | 30 | #define SWI_SYS_SIGRETURN (0xef000000|(__NR_sigreturn)|(__NR_OABI_SYSCALL_BASE)) |
| 31 | #define SWI_SYS_RT_SIGRETURN (0xef000000|(__NR_rt_sigreturn)|(__NR_OABI_SYSCALL_BASE)) |
Russell King | ab72b00 | 2009-10-25 15:39:37 +0000 | [diff] [blame] | 32 | #define SWI_SYS_RESTART (0xef000000|__NR_restart_syscall|__NR_OABI_SYSCALL_BASE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | /* |
Nicolas Pitre | fcca538 | 2006-01-18 22:38:47 +0000 | [diff] [blame] | 35 | * With EABI, the syscall number has to be loaded into r7. |
| 36 | */ |
| 37 | #define MOV_R7_NR_SIGRETURN (0xe3a07000 | (__NR_sigreturn - __NR_SYSCALL_BASE)) |
| 38 | #define MOV_R7_NR_RT_SIGRETURN (0xe3a07000 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE)) |
| 39 | |
| 40 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | * For Thumb syscalls, we pass the syscall number via r7. We therefore |
| 42 | * need two 16-bit instructions. |
| 43 | */ |
| 44 | #define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_sigreturn - __NR_SYSCALL_BASE)) |
| 45 | #define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE)) |
| 46 | |
Nicolas Pitre | fcca538 | 2006-01-18 22:38:47 +0000 | [diff] [blame] | 47 | const unsigned long sigreturn_codes[7] = { |
| 48 | MOV_R7_NR_SIGRETURN, SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN, |
| 49 | MOV_R7_NR_RT_SIGRETURN, SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | }; |
| 51 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | /* |
Russell King | ab72b00 | 2009-10-25 15:39:37 +0000 | [diff] [blame] | 53 | * Either we support OABI only, or we have EABI with the OABI |
| 54 | * compat layer enabled. In the later case we don't know if |
| 55 | * user space is EABI or not, and if not we must not clobber r7. |
| 56 | * Always using the OABI syscall solves that issue and works for |
| 57 | * all those cases. |
| 58 | */ |
| 59 | const unsigned long syscall_restart_code[2] = { |
| 60 | SWI_SYS_RESTART, /* swi __NR_restart_syscall */ |
| 61 | 0xe49df004, /* ldr pc, [sp], #4 */ |
| 62 | }; |
| 63 | |
| 64 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | * atomically swap in the new signal mask, and wait for a signal. |
| 66 | */ |
Mikael Pettersson | 3698426 | 2009-08-15 12:58:11 +0100 | [diff] [blame] | 67 | asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | { |
Matt Fleming | 101d9b0 | 2012-03-05 15:05:34 -0800 | [diff] [blame] | 69 | sigset_t blocked; |
| 70 | |
Mikael Pettersson | 3698426 | 2009-08-15 12:58:11 +0100 | [diff] [blame] | 71 | current->saved_sigmask = current->blocked; |
Matt Fleming | 101d9b0 | 2012-03-05 15:05:34 -0800 | [diff] [blame] | 72 | |
| 73 | mask &= _BLOCKABLE; |
| 74 | siginitset(&blocked, mask); |
| 75 | set_current_blocked(&blocked); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Mikael Pettersson | 3698426 | 2009-08-15 12:58:11 +0100 | [diff] [blame] | 77 | current->state = TASK_INTERRUPTIBLE; |
| 78 | schedule(); |
| 79 | set_restore_sigmask(); |
| 80 | return -ERESTARTNOHAND; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | } |
| 82 | |
| 83 | asmlinkage int |
| 84 | sys_sigaction(int sig, const struct old_sigaction __user *act, |
| 85 | struct old_sigaction __user *oact) |
| 86 | { |
| 87 | struct k_sigaction new_ka, old_ka; |
| 88 | int ret; |
| 89 | |
| 90 | if (act) { |
| 91 | old_sigset_t mask; |
| 92 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || |
| 93 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || |
| 94 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) |
| 95 | return -EFAULT; |
| 96 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
| 97 | __get_user(mask, &act->sa_mask); |
| 98 | siginitset(&new_ka.sa.sa_mask, mask); |
| 99 | } |
| 100 | |
| 101 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 102 | |
| 103 | if (!ret && oact) { |
| 104 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || |
| 105 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || |
| 106 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) |
| 107 | return -EFAULT; |
| 108 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
| 109 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); |
| 110 | } |
| 111 | |
| 112 | return ret; |
| 113 | } |
| 114 | |
Lennert Buytenhek | 3bec6ded | 2006-06-27 22:56:18 +0100 | [diff] [blame] | 115 | #ifdef CONFIG_CRUNCH |
Hartley Sweeten | 65a5053 | 2009-08-04 23:20:45 +0100 | [diff] [blame] | 116 | static int preserve_crunch_context(struct crunch_sigframe __user *frame) |
Lennert Buytenhek | 3bec6ded | 2006-06-27 22:56:18 +0100 | [diff] [blame] | 117 | { |
| 118 | char kbuf[sizeof(*frame) + 8]; |
| 119 | struct crunch_sigframe *kframe; |
| 120 | |
| 121 | /* the crunch context must be 64 bit aligned */ |
| 122 | kframe = (struct crunch_sigframe *)((unsigned long)(kbuf + 8) & ~7); |
| 123 | kframe->magic = CRUNCH_MAGIC; |
| 124 | kframe->size = CRUNCH_STORAGE_SIZE; |
| 125 | crunch_task_copy(current_thread_info(), &kframe->storage); |
| 126 | return __copy_to_user(frame, kframe, sizeof(*frame)); |
| 127 | } |
| 128 | |
Hartley Sweeten | 65a5053 | 2009-08-04 23:20:45 +0100 | [diff] [blame] | 129 | static int restore_crunch_context(struct crunch_sigframe __user *frame) |
Lennert Buytenhek | 3bec6ded | 2006-06-27 22:56:18 +0100 | [diff] [blame] | 130 | { |
| 131 | char kbuf[sizeof(*frame) + 8]; |
| 132 | struct crunch_sigframe *kframe; |
| 133 | |
| 134 | /* the crunch context must be 64 bit aligned */ |
| 135 | kframe = (struct crunch_sigframe *)((unsigned long)(kbuf + 8) & ~7); |
| 136 | if (__copy_from_user(kframe, frame, sizeof(*frame))) |
| 137 | return -1; |
| 138 | if (kframe->magic != CRUNCH_MAGIC || |
| 139 | kframe->size != CRUNCH_STORAGE_SIZE) |
| 140 | return -1; |
| 141 | crunch_task_restore(current_thread_info(), &kframe->storage); |
| 142 | return 0; |
| 143 | } |
| 144 | #endif |
| 145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | #ifdef CONFIG_IWMMXT |
| 147 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | static int preserve_iwmmxt_context(struct iwmmxt_sigframe *frame) |
| 149 | { |
Hugh Dickins | 69b0475 | 2005-10-29 18:16:36 -0700 | [diff] [blame] | 150 | char kbuf[sizeof(*frame) + 8]; |
| 151 | struct iwmmxt_sigframe *kframe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
| 153 | /* the iWMMXt context must be 64 bit aligned */ |
Hugh Dickins | 69b0475 | 2005-10-29 18:16:36 -0700 | [diff] [blame] | 154 | kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7); |
Daniel Jacobowitz | 85fe068 | 2006-06-24 23:46:21 +0100 | [diff] [blame] | 155 | kframe->magic = IWMMXT_MAGIC; |
| 156 | kframe->size = IWMMXT_STORAGE_SIZE; |
Hugh Dickins | 69b0475 | 2005-10-29 18:16:36 -0700 | [diff] [blame] | 157 | iwmmxt_task_copy(current_thread_info(), &kframe->storage); |
| 158 | return __copy_to_user(frame, kframe, sizeof(*frame)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | static int restore_iwmmxt_context(struct iwmmxt_sigframe *frame) |
| 162 | { |
Hugh Dickins | 69b0475 | 2005-10-29 18:16:36 -0700 | [diff] [blame] | 163 | char kbuf[sizeof(*frame) + 8]; |
| 164 | struct iwmmxt_sigframe *kframe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | |
Hugh Dickins | 69b0475 | 2005-10-29 18:16:36 -0700 | [diff] [blame] | 166 | /* the iWMMXt context must be 64 bit aligned */ |
| 167 | kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7); |
| 168 | if (__copy_from_user(kframe, frame, sizeof(*frame))) |
| 169 | return -1; |
Daniel Jacobowitz | 85fe068 | 2006-06-24 23:46:21 +0100 | [diff] [blame] | 170 | if (kframe->magic != IWMMXT_MAGIC || |
| 171 | kframe->size != IWMMXT_STORAGE_SIZE) |
Hugh Dickins | 69b0475 | 2005-10-29 18:16:36 -0700 | [diff] [blame] | 172 | return -1; |
| 173 | iwmmxt_task_restore(current_thread_info(), &kframe->storage); |
| 174 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | } |
| 176 | |
| 177 | #endif |
| 178 | |
Imre Deak | 82c6f5a | 2010-04-11 15:58:27 +0100 | [diff] [blame] | 179 | #ifdef CONFIG_VFP |
| 180 | |
| 181 | static int preserve_vfp_context(struct vfp_sigframe __user *frame) |
| 182 | { |
| 183 | struct thread_info *thread = current_thread_info(); |
| 184 | struct vfp_hard_struct *h = &thread->vfpstate.hard; |
| 185 | const unsigned long magic = VFP_MAGIC; |
| 186 | const unsigned long size = VFP_STORAGE_SIZE; |
| 187 | int err = 0; |
| 188 | |
| 189 | vfp_sync_hwstate(thread); |
| 190 | __put_user_error(magic, &frame->magic, err); |
| 191 | __put_user_error(size, &frame->size, err); |
| 192 | |
| 193 | /* |
| 194 | * Copy the floating point registers. There can be unused |
| 195 | * registers see asm/hwcap.h for details. |
| 196 | */ |
| 197 | err |= __copy_to_user(&frame->ufp.fpregs, &h->fpregs, |
| 198 | sizeof(h->fpregs)); |
| 199 | /* |
| 200 | * Copy the status and control register. |
| 201 | */ |
| 202 | __put_user_error(h->fpscr, &frame->ufp.fpscr, err); |
| 203 | |
| 204 | /* |
| 205 | * Copy the exception registers. |
| 206 | */ |
| 207 | __put_user_error(h->fpexc, &frame->ufp_exc.fpexc, err); |
| 208 | __put_user_error(h->fpinst, &frame->ufp_exc.fpinst, err); |
| 209 | __put_user_error(h->fpinst2, &frame->ufp_exc.fpinst2, err); |
| 210 | |
| 211 | return err ? -EFAULT : 0; |
| 212 | } |
| 213 | |
| 214 | static int restore_vfp_context(struct vfp_sigframe __user *frame) |
| 215 | { |
| 216 | struct thread_info *thread = current_thread_info(); |
| 217 | struct vfp_hard_struct *h = &thread->vfpstate.hard; |
| 218 | unsigned long magic; |
| 219 | unsigned long size; |
| 220 | unsigned long fpexc; |
| 221 | int err = 0; |
| 222 | |
| 223 | __get_user_error(magic, &frame->magic, err); |
| 224 | __get_user_error(size, &frame->size, err); |
| 225 | |
| 226 | if (err) |
| 227 | return -EFAULT; |
| 228 | if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE) |
| 229 | return -EINVAL; |
| 230 | |
Will Deacon | 2af276d | 2012-01-30 20:21:42 +0100 | [diff] [blame] | 231 | vfp_flush_hwstate(thread); |
| 232 | |
Imre Deak | 82c6f5a | 2010-04-11 15:58:27 +0100 | [diff] [blame] | 233 | /* |
| 234 | * Copy the floating point registers. There can be unused |
| 235 | * registers see asm/hwcap.h for details. |
| 236 | */ |
| 237 | err |= __copy_from_user(&h->fpregs, &frame->ufp.fpregs, |
| 238 | sizeof(h->fpregs)); |
| 239 | /* |
| 240 | * Copy the status and control register. |
| 241 | */ |
| 242 | __get_user_error(h->fpscr, &frame->ufp.fpscr, err); |
| 243 | |
| 244 | /* |
| 245 | * Sanitise and restore the exception registers. |
| 246 | */ |
| 247 | __get_user_error(fpexc, &frame->ufp_exc.fpexc, err); |
| 248 | /* Ensure the VFP is enabled. */ |
| 249 | fpexc |= FPEXC_EN; |
| 250 | /* Ensure FPINST2 is invalid and the exception flag is cleared. */ |
| 251 | fpexc &= ~(FPEXC_EX | FPEXC_FP2V); |
| 252 | h->fpexc = fpexc; |
| 253 | |
| 254 | __get_user_error(h->fpinst, &frame->ufp_exc.fpinst, err); |
| 255 | __get_user_error(h->fpinst2, &frame->ufp_exc.fpinst2, err); |
| 256 | |
Imre Deak | 82c6f5a | 2010-04-11 15:58:27 +0100 | [diff] [blame] | 257 | return err ? -EFAULT : 0; |
| 258 | } |
| 259 | |
| 260 | #endif |
| 261 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | * Do a signal return; undo the signal stack. These are aligned to 64-bit. |
| 264 | */ |
| 265 | struct sigframe { |
Russell King | 7d4fdc1 | 2006-06-15 20:13:25 +0100 | [diff] [blame] | 266 | struct ucontext uc; |
Nicolas Pitre | fcca538 | 2006-01-18 22:38:47 +0000 | [diff] [blame] | 267 | unsigned long retcode[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | }; |
| 269 | |
| 270 | struct rt_sigframe { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | struct siginfo info; |
Russell King | cb3504e | 2006-06-15 20:18:25 +0100 | [diff] [blame] | 272 | struct sigframe sig; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | }; |
| 274 | |
Russell King | 6807148 | 2006-06-15 20:23:02 +0100 | [diff] [blame] | 275 | static int restore_sigframe(struct pt_regs *regs, struct sigframe __user *sf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | { |
Daniel Jacobowitz | 85fe068 | 2006-06-24 23:46:21 +0100 | [diff] [blame] | 277 | struct aux_sigframe __user *aux; |
Russell King | 6807148 | 2006-06-15 20:23:02 +0100 | [diff] [blame] | 278 | sigset_t set; |
| 279 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | |
Russell King | 6807148 | 2006-06-15 20:23:02 +0100 | [diff] [blame] | 281 | err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set)); |
| 282 | if (err == 0) { |
| 283 | sigdelsetmask(&set, ~_BLOCKABLE); |
Matt Fleming | 101d9b0 | 2012-03-05 15:05:34 -0800 | [diff] [blame] | 284 | set_current_blocked(&set); |
Russell King | 6807148 | 2006-06-15 20:23:02 +0100 | [diff] [blame] | 285 | } |
| 286 | |
| 287 | __get_user_error(regs->ARM_r0, &sf->uc.uc_mcontext.arm_r0, err); |
| 288 | __get_user_error(regs->ARM_r1, &sf->uc.uc_mcontext.arm_r1, err); |
| 289 | __get_user_error(regs->ARM_r2, &sf->uc.uc_mcontext.arm_r2, err); |
| 290 | __get_user_error(regs->ARM_r3, &sf->uc.uc_mcontext.arm_r3, err); |
| 291 | __get_user_error(regs->ARM_r4, &sf->uc.uc_mcontext.arm_r4, err); |
| 292 | __get_user_error(regs->ARM_r5, &sf->uc.uc_mcontext.arm_r5, err); |
| 293 | __get_user_error(regs->ARM_r6, &sf->uc.uc_mcontext.arm_r6, err); |
| 294 | __get_user_error(regs->ARM_r7, &sf->uc.uc_mcontext.arm_r7, err); |
| 295 | __get_user_error(regs->ARM_r8, &sf->uc.uc_mcontext.arm_r8, err); |
| 296 | __get_user_error(regs->ARM_r9, &sf->uc.uc_mcontext.arm_r9, err); |
| 297 | __get_user_error(regs->ARM_r10, &sf->uc.uc_mcontext.arm_r10, err); |
| 298 | __get_user_error(regs->ARM_fp, &sf->uc.uc_mcontext.arm_fp, err); |
| 299 | __get_user_error(regs->ARM_ip, &sf->uc.uc_mcontext.arm_ip, err); |
| 300 | __get_user_error(regs->ARM_sp, &sf->uc.uc_mcontext.arm_sp, err); |
| 301 | __get_user_error(regs->ARM_lr, &sf->uc.uc_mcontext.arm_lr, err); |
| 302 | __get_user_error(regs->ARM_pc, &sf->uc.uc_mcontext.arm_pc, err); |
| 303 | __get_user_error(regs->ARM_cpsr, &sf->uc.uc_mcontext.arm_cpsr, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
| 305 | err |= !valid_user_regs(regs); |
| 306 | |
Daniel Jacobowitz | 85fe068 | 2006-06-24 23:46:21 +0100 | [diff] [blame] | 307 | aux = (struct aux_sigframe __user *) sf->uc.uc_regspace; |
Lennert Buytenhek | 3bec6ded | 2006-06-27 22:56:18 +0100 | [diff] [blame] | 308 | #ifdef CONFIG_CRUNCH |
| 309 | if (err == 0) |
| 310 | err |= restore_crunch_context(&aux->crunch); |
| 311 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | #ifdef CONFIG_IWMMXT |
| 313 | if (err == 0 && test_thread_flag(TIF_USING_IWMMXT)) |
| 314 | err |= restore_iwmmxt_context(&aux->iwmmxt); |
| 315 | #endif |
| 316 | #ifdef CONFIG_VFP |
Imre Deak | 82c6f5a | 2010-04-11 15:58:27 +0100 | [diff] [blame] | 317 | if (err == 0) |
| 318 | err |= restore_vfp_context(&aux->vfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | #endif |
| 320 | |
| 321 | return err; |
| 322 | } |
| 323 | |
| 324 | asmlinkage int sys_sigreturn(struct pt_regs *regs) |
| 325 | { |
| 326 | struct sigframe __user *frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | |
| 328 | /* Always make any pending restarted system calls return -EINTR */ |
| 329 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 330 | |
| 331 | /* |
| 332 | * Since we stacked the signal on a 64-bit boundary, |
| 333 | * then 'sp' should be word aligned here. If it's |
| 334 | * not, then the user is trying to mess with us. |
| 335 | */ |
| 336 | if (regs->ARM_sp & 7) |
| 337 | goto badframe; |
| 338 | |
| 339 | frame = (struct sigframe __user *)regs->ARM_sp; |
| 340 | |
| 341 | if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) |
| 342 | goto badframe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | |
Russell King | 6807148 | 2006-06-15 20:23:02 +0100 | [diff] [blame] | 344 | if (restore_sigframe(regs, frame)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | goto badframe; |
| 346 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | return regs->ARM_r0; |
| 348 | |
| 349 | badframe: |
| 350 | force_sig(SIGSEGV, current); |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | asmlinkage int sys_rt_sigreturn(struct pt_regs *regs) |
| 355 | { |
| 356 | struct rt_sigframe __user *frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | |
| 358 | /* Always make any pending restarted system calls return -EINTR */ |
| 359 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 360 | |
| 361 | /* |
| 362 | * Since we stacked the signal on a 64-bit boundary, |
| 363 | * then 'sp' should be word aligned here. If it's |
| 364 | * not, then the user is trying to mess with us. |
| 365 | */ |
| 366 | if (regs->ARM_sp & 7) |
| 367 | goto badframe; |
| 368 | |
| 369 | frame = (struct rt_sigframe __user *)regs->ARM_sp; |
| 370 | |
| 371 | if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) |
| 372 | goto badframe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | |
Russell King | 6807148 | 2006-06-15 20:23:02 +0100 | [diff] [blame] | 374 | if (restore_sigframe(regs, &frame->sig)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | goto badframe; |
| 376 | |
Russell King | cb3504e | 2006-06-15 20:18:25 +0100 | [diff] [blame] | 377 | if (do_sigaltstack(&frame->sig.uc.uc_stack, NULL, regs->ARM_sp) == -EFAULT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | goto badframe; |
| 379 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | return regs->ARM_r0; |
| 381 | |
| 382 | badframe: |
| 383 | force_sig(SIGSEGV, current); |
| 384 | return 0; |
| 385 | } |
| 386 | |
| 387 | static int |
Russell King | aca6ca1 | 2006-06-15 20:28:03 +0100 | [diff] [blame] | 388 | setup_sigframe(struct sigframe __user *sf, struct pt_regs *regs, sigset_t *set) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | { |
Daniel Jacobowitz | 85fe068 | 2006-06-24 23:46:21 +0100 | [diff] [blame] | 390 | struct aux_sigframe __user *aux; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | int err = 0; |
| 392 | |
Russell King | aca6ca1 | 2006-06-15 20:28:03 +0100 | [diff] [blame] | 393 | __put_user_error(regs->ARM_r0, &sf->uc.uc_mcontext.arm_r0, err); |
| 394 | __put_user_error(regs->ARM_r1, &sf->uc.uc_mcontext.arm_r1, err); |
| 395 | __put_user_error(regs->ARM_r2, &sf->uc.uc_mcontext.arm_r2, err); |
| 396 | __put_user_error(regs->ARM_r3, &sf->uc.uc_mcontext.arm_r3, err); |
| 397 | __put_user_error(regs->ARM_r4, &sf->uc.uc_mcontext.arm_r4, err); |
| 398 | __put_user_error(regs->ARM_r5, &sf->uc.uc_mcontext.arm_r5, err); |
| 399 | __put_user_error(regs->ARM_r6, &sf->uc.uc_mcontext.arm_r6, err); |
| 400 | __put_user_error(regs->ARM_r7, &sf->uc.uc_mcontext.arm_r7, err); |
| 401 | __put_user_error(regs->ARM_r8, &sf->uc.uc_mcontext.arm_r8, err); |
| 402 | __put_user_error(regs->ARM_r9, &sf->uc.uc_mcontext.arm_r9, err); |
| 403 | __put_user_error(regs->ARM_r10, &sf->uc.uc_mcontext.arm_r10, err); |
| 404 | __put_user_error(regs->ARM_fp, &sf->uc.uc_mcontext.arm_fp, err); |
| 405 | __put_user_error(regs->ARM_ip, &sf->uc.uc_mcontext.arm_ip, err); |
| 406 | __put_user_error(regs->ARM_sp, &sf->uc.uc_mcontext.arm_sp, err); |
| 407 | __put_user_error(regs->ARM_lr, &sf->uc.uc_mcontext.arm_lr, err); |
| 408 | __put_user_error(regs->ARM_pc, &sf->uc.uc_mcontext.arm_pc, err); |
| 409 | __put_user_error(regs->ARM_cpsr, &sf->uc.uc_mcontext.arm_cpsr, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | |
Russell King | aca6ca1 | 2006-06-15 20:28:03 +0100 | [diff] [blame] | 411 | __put_user_error(current->thread.trap_no, &sf->uc.uc_mcontext.trap_no, err); |
| 412 | __put_user_error(current->thread.error_code, &sf->uc.uc_mcontext.error_code, err); |
| 413 | __put_user_error(current->thread.address, &sf->uc.uc_mcontext.fault_address, err); |
| 414 | __put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | |
Russell King | aca6ca1 | 2006-06-15 20:28:03 +0100 | [diff] [blame] | 416 | err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | |
Daniel Jacobowitz | 85fe068 | 2006-06-24 23:46:21 +0100 | [diff] [blame] | 418 | aux = (struct aux_sigframe __user *) sf->uc.uc_regspace; |
Lennert Buytenhek | 3bec6ded | 2006-06-27 22:56:18 +0100 | [diff] [blame] | 419 | #ifdef CONFIG_CRUNCH |
| 420 | if (err == 0) |
| 421 | err |= preserve_crunch_context(&aux->crunch); |
| 422 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | #ifdef CONFIG_IWMMXT |
| 424 | if (err == 0 && test_thread_flag(TIF_USING_IWMMXT)) |
| 425 | err |= preserve_iwmmxt_context(&aux->iwmmxt); |
| 426 | #endif |
| 427 | #ifdef CONFIG_VFP |
Imre Deak | 82c6f5a | 2010-04-11 15:58:27 +0100 | [diff] [blame] | 428 | if (err == 0) |
| 429 | err |= preserve_vfp_context(&aux->vfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | #endif |
Daniel Jacobowitz | 85fe068 | 2006-06-24 23:46:21 +0100 | [diff] [blame] | 431 | __put_user_error(0, &aux->end_magic, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | |
| 433 | return err; |
| 434 | } |
| 435 | |
| 436 | static inline void __user * |
| 437 | get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, int framesize) |
| 438 | { |
| 439 | unsigned long sp = regs->ARM_sp; |
| 440 | void __user *frame; |
| 441 | |
| 442 | /* |
| 443 | * This is the X/Open sanctioned signal stack switching. |
| 444 | */ |
| 445 | if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp)) |
| 446 | sp = current->sas_ss_sp + current->sas_ss_size; |
| 447 | |
| 448 | /* |
| 449 | * ATPCS B01 mandates 8-byte alignment |
| 450 | */ |
| 451 | frame = (void __user *)((sp - framesize) & ~7); |
| 452 | |
| 453 | /* |
| 454 | * Check that we can actually write to the signal frame. |
| 455 | */ |
| 456 | if (!access_ok(VERIFY_WRITE, frame, framesize)) |
| 457 | frame = NULL; |
| 458 | |
| 459 | return frame; |
| 460 | } |
| 461 | |
| 462 | static int |
| 463 | setup_return(struct pt_regs *regs, struct k_sigaction *ka, |
| 464 | unsigned long __user *rc, void __user *frame, int usig) |
| 465 | { |
| 466 | unsigned long handler = (unsigned long)ka->sa.sa_handler; |
| 467 | unsigned long retcode; |
| 468 | int thumb = 0; |
Russell King | 5339905 | 2011-02-20 12:22:52 +0000 | [diff] [blame] | 469 | unsigned long cpsr = regs->ARM_cpsr & ~(PSR_f | PSR_E_BIT); |
| 470 | |
| 471 | cpsr |= PSR_ENDSTATE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | |
| 473 | /* |
| 474 | * Maybe we need to deliver a 32-bit signal to a 26-bit task. |
| 475 | */ |
| 476 | if (ka->sa.sa_flags & SA_THIRTYTWO) |
| 477 | cpsr = (cpsr & ~MODE_MASK) | USR_MODE; |
| 478 | |
| 479 | #ifdef CONFIG_ARM_THUMB |
| 480 | if (elf_hwcap & HWCAP_THUMB) { |
| 481 | /* |
| 482 | * The LSB of the handler determines if we're going to |
| 483 | * be using THUMB or ARM mode for this signal handler. |
| 484 | */ |
| 485 | thumb = handler & 1; |
| 486 | |
Catalin Marinas | d71e135 | 2009-05-30 14:00:15 +0100 | [diff] [blame] | 487 | if (thumb) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | cpsr |= PSR_T_BIT; |
Catalin Marinas | d71e135 | 2009-05-30 14:00:15 +0100 | [diff] [blame] | 489 | #if __LINUX_ARM_ARCH__ >= 7 |
| 490 | /* clear the If-Then Thumb-2 execution state */ |
| 491 | cpsr &= ~PSR_IT_MASK; |
| 492 | #endif |
| 493 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | cpsr &= ~PSR_T_BIT; |
| 495 | } |
| 496 | #endif |
| 497 | |
| 498 | if (ka->sa.sa_flags & SA_RESTORER) { |
| 499 | retcode = (unsigned long)ka->sa.sa_restorer; |
| 500 | } else { |
Nicolas Pitre | fcca538 | 2006-01-18 22:38:47 +0000 | [diff] [blame] | 501 | unsigned int idx = thumb << 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | |
| 503 | if (ka->sa.sa_flags & SA_SIGINFO) |
Nicolas Pitre | fcca538 | 2006-01-18 22:38:47 +0000 | [diff] [blame] | 504 | idx += 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | |
Nicolas Pitre | fcca538 | 2006-01-18 22:38:47 +0000 | [diff] [blame] | 506 | if (__put_user(sigreturn_codes[idx], rc) || |
| 507 | __put_user(sigreturn_codes[idx+1], rc+1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | return 1; |
| 509 | |
Russell King | e00d349 | 2005-06-22 20:26:05 +0100 | [diff] [blame] | 510 | if (cpsr & MODE32_BIT) { |
| 511 | /* |
| 512 | * 32-bit code can use the new high-page |
| 513 | * signal return code support. |
| 514 | */ |
| 515 | retcode = KERN_SIGRETURN_CODE + (idx << 2) + thumb; |
| 516 | } else { |
| 517 | /* |
| 518 | * Ensure that the instruction cache sees |
| 519 | * the return code written onto the stack. |
| 520 | */ |
| 521 | flush_icache_range((unsigned long)rc, |
Nicolas Pitre | fcca538 | 2006-01-18 22:38:47 +0000 | [diff] [blame] | 522 | (unsigned long)(rc + 2)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | |
Russell King | e00d349 | 2005-06-22 20:26:05 +0100 | [diff] [blame] | 524 | retcode = ((unsigned long)rc) + thumb; |
| 525 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | } |
| 527 | |
| 528 | regs->ARM_r0 = usig; |
| 529 | regs->ARM_sp = (unsigned long)frame; |
| 530 | regs->ARM_lr = retcode; |
| 531 | regs->ARM_pc = handler; |
| 532 | regs->ARM_cpsr = cpsr; |
| 533 | |
| 534 | return 0; |
| 535 | } |
| 536 | |
| 537 | static int |
| 538 | setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, struct pt_regs *regs) |
| 539 | { |
| 540 | struct sigframe __user *frame = get_sigframe(ka, regs, sizeof(*frame)); |
| 541 | int err = 0; |
| 542 | |
| 543 | if (!frame) |
| 544 | return 1; |
| 545 | |
Russell King | ca195cf | 2006-06-24 22:41:09 +0100 | [diff] [blame] | 546 | /* |
| 547 | * Set uc.uc_flags to a value which sc.trap_no would never have. |
| 548 | */ |
| 549 | __put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | |
Russell King | aca6ca1 | 2006-06-15 20:28:03 +0100 | [diff] [blame] | 551 | err |= setup_sigframe(frame, regs, set); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | if (err == 0) |
Nicolas Pitre | fcca538 | 2006-01-18 22:38:47 +0000 | [diff] [blame] | 553 | err = setup_return(regs, ka, frame->retcode, frame, usig); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | |
| 555 | return err; |
| 556 | } |
| 557 | |
| 558 | static int |
| 559 | setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info, |
| 560 | sigset_t *set, struct pt_regs *regs) |
| 561 | { |
| 562 | struct rt_sigframe __user *frame = get_sigframe(ka, regs, sizeof(*frame)); |
| 563 | stack_t stack; |
| 564 | int err = 0; |
| 565 | |
| 566 | if (!frame) |
| 567 | return 1; |
| 568 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | err |= copy_siginfo_to_user(&frame->info, info); |
| 570 | |
Russell King | cb3504e | 2006-06-15 20:18:25 +0100 | [diff] [blame] | 571 | __put_user_error(0, &frame->sig.uc.uc_flags, err); |
| 572 | __put_user_error(NULL, &frame->sig.uc.uc_link, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | |
| 574 | memset(&stack, 0, sizeof(stack)); |
| 575 | stack.ss_sp = (void __user *)current->sas_ss_sp; |
| 576 | stack.ss_flags = sas_ss_flags(regs->ARM_sp); |
| 577 | stack.ss_size = current->sas_ss_size; |
Russell King | cb3504e | 2006-06-15 20:18:25 +0100 | [diff] [blame] | 578 | err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | |
Russell King | aca6ca1 | 2006-06-15 20:28:03 +0100 | [diff] [blame] | 580 | err |= setup_sigframe(&frame->sig, regs, set); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | if (err == 0) |
Russell King | cb3504e | 2006-06-15 20:18:25 +0100 | [diff] [blame] | 582 | err = setup_return(regs, ka, frame->sig.retcode, frame, usig); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
| 584 | if (err == 0) { |
| 585 | /* |
| 586 | * For realtime signals we must also set the second and third |
| 587 | * arguments for the signal handler. |
| 588 | * -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06 |
| 589 | */ |
| 590 | regs->ARM_r1 = (unsigned long)&frame->info; |
Russell King | cb3504e | 2006-06-15 20:18:25 +0100 | [diff] [blame] | 591 | regs->ARM_r2 = (unsigned long)&frame->sig.uc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | } |
| 593 | |
| 594 | return err; |
| 595 | } |
| 596 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | /* |
| 598 | * OK, we're invoking a handler |
| 599 | */ |
Mikael Pettersson | 3698426 | 2009-08-15 12:58:11 +0100 | [diff] [blame] | 600 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | handle_signal(unsigned long sig, struct k_sigaction *ka, |
| 602 | siginfo_t *info, sigset_t *oldset, |
Arnd Bergmann | 2af68df | 2011-05-03 18:32:55 +0100 | [diff] [blame] | 603 | struct pt_regs * regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | { |
| 605 | struct thread_info *thread = current_thread_info(); |
| 606 | struct task_struct *tsk = current; |
| 607 | int usig = sig; |
| 608 | int ret; |
| 609 | |
| 610 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | * translate the signal |
| 612 | */ |
| 613 | if (usig < 32 && thread->exec_domain && thread->exec_domain->signal_invmap) |
| 614 | usig = thread->exec_domain->signal_invmap[usig]; |
| 615 | |
| 616 | /* |
| 617 | * Set up the stack frame |
| 618 | */ |
| 619 | if (ka->sa.sa_flags & SA_SIGINFO) |
| 620 | ret = setup_rt_frame(usig, ka, info, oldset, regs); |
| 621 | else |
| 622 | ret = setup_frame(usig, ka, oldset, regs); |
| 623 | |
| 624 | /* |
| 625 | * Check that the resulting registers are actually sane. |
| 626 | */ |
| 627 | ret |= !valid_user_regs(regs); |
| 628 | |
Steven Rostedt | 69be8f1 | 2005-08-29 11:44:09 -0400 | [diff] [blame] | 629 | if (ret != 0) { |
Daniel Jacobowitz | a6c61e9 | 2005-11-19 10:01:07 +0000 | [diff] [blame] | 630 | force_sigsegv(sig, tsk); |
Mikael Pettersson | 3698426 | 2009-08-15 12:58:11 +0100 | [diff] [blame] | 631 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | } |
| 633 | |
Daniel Jacobowitz | a6c61e9 | 2005-11-19 10:01:07 +0000 | [diff] [blame] | 634 | /* |
| 635 | * Block the signal if we were successful. |
| 636 | */ |
Matt Fleming | 101d9b0 | 2012-03-05 15:05:34 -0800 | [diff] [blame] | 637 | block_sigmask(ka, sig); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | |
Mikael Pettersson | 3698426 | 2009-08-15 12:58:11 +0100 | [diff] [blame] | 639 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | } |
| 641 | |
| 642 | /* |
| 643 | * Note that 'init' is a special process: it doesn't get signals it doesn't |
| 644 | * want to handle. Thus you cannot kill init even with a SIGKILL even by |
| 645 | * mistake. |
| 646 | * |
| 647 | * Note that we go through the signals twice: once to check the signals that |
| 648 | * the kernel can handle, and then we build all the user-level signal handling |
| 649 | * stack-frames in one go after that. |
| 650 | */ |
Mikael Pettersson | 3698426 | 2009-08-15 12:58:11 +0100 | [diff] [blame] | 651 | static void do_signal(struct pt_regs *regs, int syscall) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | { |
Arnd Bergmann | 2af68df | 2011-05-03 18:32:55 +0100 | [diff] [blame] | 653 | unsigned int retval = 0, continue_addr = 0, restart_addr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | struct k_sigaction ka; |
| 655 | siginfo_t info; |
| 656 | int signr; |
| 657 | |
| 658 | /* |
| 659 | * We want the common case to go fast, which |
| 660 | * is why we may in certain cases get here from |
| 661 | * kernel mode. Just return without doing anything |
| 662 | * if so. |
| 663 | */ |
| 664 | if (!user_mode(regs)) |
Mikael Pettersson | 3698426 | 2009-08-15 12:58:11 +0100 | [diff] [blame] | 665 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | |
Arnd Bergmann | 2af68df | 2011-05-03 18:32:55 +0100 | [diff] [blame] | 667 | /* |
| 668 | * If we were from a system call, check for system call restarting... |
| 669 | */ |
| 670 | if (syscall) { |
| 671 | continue_addr = regs->ARM_pc; |
| 672 | restart_addr = continue_addr - (thumb_mode(regs) ? 2 : 4); |
| 673 | retval = regs->ARM_r0; |
| 674 | |
| 675 | /* |
| 676 | * Prepare for system call restart. We do this here so that a |
| 677 | * debugger will see the already changed PSW. |
| 678 | */ |
| 679 | switch (retval) { |
| 680 | case -ERESTARTNOHAND: |
| 681 | case -ERESTARTSYS: |
| 682 | case -ERESTARTNOINTR: |
| 683 | regs->ARM_r0 = regs->ARM_ORIG_r0; |
| 684 | regs->ARM_pc = restart_addr; |
| 685 | break; |
| 686 | case -ERESTART_RESTARTBLOCK: |
| 687 | regs->ARM_r0 = -EINTR; |
| 688 | break; |
| 689 | } |
| 690 | } |
| 691 | |
Andrew Morton | bdb94f3 | 2005-06-26 03:27:21 -0700 | [diff] [blame] | 692 | if (try_to_freeze()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | goto no_signal; |
| 694 | |
Arnd Bergmann | 2af68df | 2011-05-03 18:32:55 +0100 | [diff] [blame] | 695 | /* |
| 696 | * Get the signal to deliver. When running under ptrace, at this |
| 697 | * point the debugger may change all our registers ... |
| 698 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
| 700 | if (signr > 0) { |
Mikael Pettersson | 3698426 | 2009-08-15 12:58:11 +0100 | [diff] [blame] | 701 | sigset_t *oldset; |
| 702 | |
Arnd Bergmann | 2af68df | 2011-05-03 18:32:55 +0100 | [diff] [blame] | 703 | /* |
| 704 | * Depending on the signal settings we may need to revert the |
| 705 | * decision to restart the system call. But skip this if a |
| 706 | * debugger has chosen to restart at a different PC. |
| 707 | */ |
| 708 | if (regs->ARM_pc == restart_addr) { |
| 709 | if (retval == -ERESTARTNOHAND |
| 710 | || (retval == -ERESTARTSYS |
| 711 | && !(ka.sa.sa_flags & SA_RESTART))) { |
| 712 | regs->ARM_r0 = -EINTR; |
| 713 | regs->ARM_pc = continue_addr; |
| 714 | } |
| 715 | } |
| 716 | |
Mikael Pettersson | 3698426 | 2009-08-15 12:58:11 +0100 | [diff] [blame] | 717 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
| 718 | oldset = ¤t->saved_sigmask; |
| 719 | else |
| 720 | oldset = ¤t->blocked; |
Arnd Bergmann | 2af68df | 2011-05-03 18:32:55 +0100 | [diff] [blame] | 721 | if (handle_signal(signr, &ka, &info, oldset, regs) == 0) { |
Mikael Pettersson | 3698426 | 2009-08-15 12:58:11 +0100 | [diff] [blame] | 722 | /* |
| 723 | * A signal was successfully delivered; the saved |
| 724 | * sigmask will have been stored in the signal frame, |
| 725 | * and will be restored by sigreturn, so we can simply |
| 726 | * clear the TIF_RESTORE_SIGMASK flag. |
| 727 | */ |
| 728 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
| 729 | clear_thread_flag(TIF_RESTORE_SIGMASK); |
| 730 | } |
Mikael Pettersson | 3698426 | 2009-08-15 12:58:11 +0100 | [diff] [blame] | 731 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | } |
| 733 | |
| 734 | no_signal: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | if (syscall) { |
Arnd Bergmann | 2af68df | 2011-05-03 18:32:55 +0100 | [diff] [blame] | 736 | /* |
| 737 | * Handle restarting a different system call. As above, |
| 738 | * if a debugger has chosen to restart at a different PC, |
| 739 | * ignore the restart. |
| 740 | */ |
| 741 | if (retval == -ERESTART_RESTARTBLOCK |
| 742 | && regs->ARM_pc == continue_addr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | if (thumb_mode(regs)) { |
Nicolas Pitre | f606a6f | 2006-06-22 22:18:45 +0100 | [diff] [blame] | 744 | regs->ARM_r7 = __NR_restart_syscall - __NR_SYSCALL_BASE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | regs->ARM_pc -= 2; |
| 746 | } else { |
Nicolas Pitre | f606a6f | 2006-06-22 22:18:45 +0100 | [diff] [blame] | 747 | #if defined(CONFIG_AEABI) && !defined(CONFIG_OABI_COMPAT) |
| 748 | regs->ARM_r7 = __NR_restart_syscall; |
| 749 | regs->ARM_pc -= 4; |
| 750 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | u32 __user *usp; |
| 752 | |
Russell King | ab72b00 | 2009-10-25 15:39:37 +0000 | [diff] [blame] | 753 | regs->ARM_sp -= 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | usp = (u32 __user *)regs->ARM_sp; |
| 755 | |
Jean PIHET | 3336f4f | 2009-11-23 17:03:32 +0100 | [diff] [blame] | 756 | if (put_user(regs->ARM_pc, usp) == 0) { |
| 757 | regs->ARM_pc = KERN_RESTART_CODE; |
| 758 | } else { |
| 759 | regs->ARM_sp += 4; |
| 760 | force_sigsegv(0, current); |
| 761 | } |
Nicolas Pitre | f606a6f | 2006-06-22 22:18:45 +0100 | [diff] [blame] | 762 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | } |
| 764 | } |
Mikael Pettersson | 3698426 | 2009-08-15 12:58:11 +0100 | [diff] [blame] | 765 | |
| 766 | /* If there's no signal to deliver, we just put the saved sigmask |
| 767 | * back. |
| 768 | */ |
| 769 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { |
| 770 | clear_thread_flag(TIF_RESTORE_SIGMASK); |
| 771 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); |
| 772 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | } |
| 775 | |
| 776 | asmlinkage void |
| 777 | do_notify_resume(struct pt_regs *regs, unsigned int thread_flags, int syscall) |
| 778 | { |
| 779 | if (thread_flags & _TIF_SIGPENDING) |
Mikael Pettersson | 3698426 | 2009-08-15 12:58:11 +0100 | [diff] [blame] | 780 | do_signal(regs, syscall); |
David Howells | d0420c8 | 2009-09-02 09:14:16 +0100 | [diff] [blame] | 781 | |
| 782 | if (thread_flags & _TIF_NOTIFY_RESUME) { |
| 783 | clear_thread_flag(TIF_NOTIFY_RESUME); |
| 784 | tracehook_notify_resume(regs); |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 785 | if (current->replacement_session_keyring) |
| 786 | key_replace_session_keyring(); |
David Howells | d0420c8 | 2009-09-02 09:14:16 +0100 | [diff] [blame] | 787 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | } |