Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Signal handling for 32bit PPC and 32bit tasks on 64bit PPC |
| 3 | * |
| 4 | * PowerPC version |
| 5 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) |
| 6 | * Copyright (C) 2001 IBM |
| 7 | * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
| 8 | * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) |
| 9 | * |
| 10 | * Derived from "arch/i386/kernel/signal.c" |
| 11 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 12 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or |
| 15 | * modify it under the terms of the GNU General Public License |
| 16 | * as published by the Free Software Foundation; either version |
| 17 | * 2 of the License, or (at your option) any later version. |
| 18 | */ |
| 19 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 20 | #include <linux/sched.h> |
| 21 | #include <linux/mm.h> |
| 22 | #include <linux/smp.h> |
| 23 | #include <linux/smp_lock.h> |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/signal.h> |
| 26 | #include <linux/errno.h> |
| 27 | #include <linux/elf.h> |
| 28 | #ifdef CONFIG_PPC64 |
| 29 | #include <linux/syscalls.h> |
| 30 | #include <linux/compat.h> |
| 31 | #include <linux/ptrace.h> |
| 32 | #else |
| 33 | #include <linux/wait.h> |
| 34 | #include <linux/ptrace.h> |
| 35 | #include <linux/unistd.h> |
| 36 | #include <linux/stddef.h> |
| 37 | #include <linux/tty.h> |
| 38 | #include <linux/binfmts.h> |
| 39 | #include <linux/suspend.h> |
| 40 | #endif |
| 41 | |
| 42 | #include <asm/uaccess.h> |
| 43 | #include <asm/cacheflush.h> |
Arnd Bergmann | a7f3184 | 2006-03-23 00:00:08 +0100 | [diff] [blame] | 44 | #include <asm/syscalls.h> |
David Gibson | c5ff700 | 2005-11-09 11:21:07 +1100 | [diff] [blame] | 45 | #include <asm/sigcontext.h> |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 46 | #include <asm/vdso.h> |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 47 | #ifdef CONFIG_PPC64 |
Stephen Rothwell | 879168e | 2005-11-03 15:32:07 +1100 | [diff] [blame] | 48 | #include "ppc32.h" |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 49 | #include <asm/unistd.h> |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 50 | #else |
| 51 | #include <asm/ucontext.h> |
| 52 | #include <asm/pgtable.h> |
| 53 | #endif |
| 54 | |
| 55 | #undef DEBUG_SIG |
| 56 | |
| 57 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| 58 | |
| 59 | #ifdef CONFIG_PPC64 |
| 60 | #define do_signal do_signal32 |
Stephen Rothwell | b09a491 | 2005-10-18 14:51:57 +1000 | [diff] [blame] | 61 | #define sys_sigsuspend compat_sys_sigsuspend |
| 62 | #define sys_rt_sigsuspend compat_sys_rt_sigsuspend |
| 63 | #define sys_rt_sigreturn compat_sys_rt_sigreturn |
| 64 | #define sys_sigaction compat_sys_sigaction |
| 65 | #define sys_swapcontext compat_sys_swapcontext |
| 66 | #define sys_sigreturn compat_sys_sigreturn |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 67 | |
| 68 | #define old_sigaction old_sigaction32 |
| 69 | #define sigcontext sigcontext32 |
| 70 | #define mcontext mcontext32 |
| 71 | #define ucontext ucontext32 |
| 72 | |
| 73 | /* |
| 74 | * Returning 0 means we return to userspace via |
| 75 | * ret_from_except and thus restore all user |
| 76 | * registers from *regs. This is what we need |
| 77 | * to do when a signal has been delivered. |
| 78 | */ |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 79 | |
| 80 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32)) |
| 81 | #undef __SIGNAL_FRAMESIZE |
| 82 | #define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32 |
| 83 | #undef ELF_NVRREG |
| 84 | #define ELF_NVRREG ELF_NVRREG32 |
| 85 | |
| 86 | /* |
| 87 | * Functions for flipping sigsets (thanks to brain dead generic |
| 88 | * implementation that makes things simple for little endian only) |
| 89 | */ |
| 90 | static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set) |
| 91 | { |
| 92 | compat_sigset_t cset; |
| 93 | |
| 94 | switch (_NSIG_WORDS) { |
| 95 | case 4: cset.sig[5] = set->sig[3] & 0xffffffffull; |
| 96 | cset.sig[7] = set->sig[3] >> 32; |
| 97 | case 3: cset.sig[4] = set->sig[2] & 0xffffffffull; |
| 98 | cset.sig[5] = set->sig[2] >> 32; |
| 99 | case 2: cset.sig[2] = set->sig[1] & 0xffffffffull; |
| 100 | cset.sig[3] = set->sig[1] >> 32; |
| 101 | case 1: cset.sig[0] = set->sig[0] & 0xffffffffull; |
| 102 | cset.sig[1] = set->sig[0] >> 32; |
| 103 | } |
| 104 | return copy_to_user(uset, &cset, sizeof(*uset)); |
| 105 | } |
| 106 | |
Paul Mackerras | 9b7cf8b | 2005-10-19 23:13:04 +1000 | [diff] [blame] | 107 | static inline int get_sigset_t(sigset_t *set, |
| 108 | const compat_sigset_t __user *uset) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 109 | { |
| 110 | compat_sigset_t s32; |
| 111 | |
| 112 | if (copy_from_user(&s32, uset, sizeof(*uset))) |
| 113 | return -EFAULT; |
| 114 | |
| 115 | /* |
| 116 | * Swap the 2 words of the 64-bit sigset_t (they are stored |
| 117 | * in the "wrong" endian in 32-bit user storage). |
| 118 | */ |
| 119 | switch (_NSIG_WORDS) { |
| 120 | case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32); |
| 121 | case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32); |
| 122 | case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32); |
| 123 | case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); |
| 124 | } |
| 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | static inline int get_old_sigaction(struct k_sigaction *new_ka, |
| 129 | struct old_sigaction __user *act) |
| 130 | { |
| 131 | compat_old_sigset_t mask; |
| 132 | compat_uptr_t handler, restorer; |
| 133 | |
| 134 | if (get_user(handler, &act->sa_handler) || |
| 135 | __get_user(restorer, &act->sa_restorer) || |
| 136 | __get_user(new_ka->sa.sa_flags, &act->sa_flags) || |
| 137 | __get_user(mask, &act->sa_mask)) |
| 138 | return -EFAULT; |
| 139 | new_ka->sa.sa_handler = compat_ptr(handler); |
| 140 | new_ka->sa.sa_restorer = compat_ptr(restorer); |
| 141 | siginitset(&new_ka->sa.sa_mask, mask); |
| 142 | return 0; |
| 143 | } |
| 144 | |
Al Viro | 29e646d | 2006-02-01 05:28:09 -0500 | [diff] [blame] | 145 | #define to_user_ptr(p) ptr_to_compat(p) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 146 | #define from_user_ptr(p) compat_ptr(p) |
| 147 | |
| 148 | static inline int save_general_regs(struct pt_regs *regs, |
| 149 | struct mcontext __user *frame) |
| 150 | { |
| 151 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; |
| 152 | int i; |
| 153 | |
Paul Mackerras | 1bd7933 | 2006-03-08 13:24:22 +1100 | [diff] [blame] | 154 | WARN_ON(!FULL_REGS(regs)); |
David Woodhouse | 401d1f0 | 2005-11-15 18:52:18 +0000 | [diff] [blame] | 155 | |
| 156 | for (i = 0; i <= PT_RESULT; i ++) { |
| 157 | if (i == 14 && !FULL_REGS(regs)) |
| 158 | i = 32; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 159 | if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i])) |
| 160 | return -EFAULT; |
David Woodhouse | 401d1f0 | 2005-11-15 18:52:18 +0000 | [diff] [blame] | 161 | } |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 162 | return 0; |
| 163 | } |
| 164 | |
| 165 | static inline int restore_general_regs(struct pt_regs *regs, |
| 166 | struct mcontext __user *sr) |
| 167 | { |
| 168 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; |
| 169 | int i; |
| 170 | |
| 171 | for (i = 0; i <= PT_RESULT; i++) { |
| 172 | if ((i == PT_MSR) || (i == PT_SOFTE)) |
| 173 | continue; |
| 174 | if (__get_user(gregs[i], &sr->mc_gregs[i])) |
| 175 | return -EFAULT; |
| 176 | } |
| 177 | return 0; |
| 178 | } |
| 179 | |
| 180 | #else /* CONFIG_PPC64 */ |
| 181 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 182 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs)) |
| 183 | |
| 184 | static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set) |
| 185 | { |
| 186 | return copy_to_user(uset, set, sizeof(*uset)); |
| 187 | } |
| 188 | |
Paul Mackerras | 9b7cf8b | 2005-10-19 23:13:04 +1000 | [diff] [blame] | 189 | static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 190 | { |
| 191 | return copy_from_user(set, uset, sizeof(*uset)); |
| 192 | } |
| 193 | |
| 194 | static inline int get_old_sigaction(struct k_sigaction *new_ka, |
| 195 | struct old_sigaction __user *act) |
| 196 | { |
| 197 | old_sigset_t mask; |
| 198 | |
| 199 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || |
| 200 | __get_user(new_ka->sa.sa_handler, &act->sa_handler) || |
| 201 | __get_user(new_ka->sa.sa_restorer, &act->sa_restorer)) |
| 202 | return -EFAULT; |
| 203 | __get_user(new_ka->sa.sa_flags, &act->sa_flags); |
| 204 | __get_user(mask, &act->sa_mask); |
| 205 | siginitset(&new_ka->sa.sa_mask, mask); |
| 206 | return 0; |
| 207 | } |
| 208 | |
Al Viro | 29e646d | 2006-02-01 05:28:09 -0500 | [diff] [blame] | 209 | #define to_user_ptr(p) ((unsigned long)(p)) |
| 210 | #define from_user_ptr(p) ((void __user *)(p)) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 211 | |
| 212 | static inline int save_general_regs(struct pt_regs *regs, |
| 213 | struct mcontext __user *frame) |
| 214 | { |
Paul Mackerras | 1bd7933 | 2006-03-08 13:24:22 +1100 | [diff] [blame] | 215 | WARN_ON(!FULL_REGS(regs)); |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 216 | return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE); |
| 217 | } |
| 218 | |
| 219 | static inline int restore_general_regs(struct pt_regs *regs, |
| 220 | struct mcontext __user *sr) |
| 221 | { |
| 222 | /* copy up to but not including MSR */ |
| 223 | if (__copy_from_user(regs, &sr->mc_gregs, |
| 224 | PT_MSR * sizeof(elf_greg_t))) |
| 225 | return -EFAULT; |
| 226 | /* copy from orig_r3 (the word after the MSR) up to the end */ |
| 227 | if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3], |
| 228 | GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t))) |
| 229 | return -EFAULT; |
| 230 | return 0; |
| 231 | } |
| 232 | |
| 233 | #endif /* CONFIG_PPC64 */ |
| 234 | |
| 235 | int do_signal(sigset_t *oldset, struct pt_regs *regs); |
| 236 | |
| 237 | /* |
| 238 | * Atomically swap in the new signal mask, and wait for a signal. |
| 239 | */ |
David Woodhouse | 150256d | 2006-01-18 17:43:57 -0800 | [diff] [blame] | 240 | long sys_sigsuspend(old_sigset_t mask) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 241 | { |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 242 | mask &= _BLOCKABLE; |
| 243 | spin_lock_irq(¤t->sighand->siglock); |
Heiko Carstens | 4a41cdf | 2006-02-01 03:05:58 -0800 | [diff] [blame] | 244 | current->saved_sigmask = current->blocked; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 245 | siginitset(¤t->blocked, mask); |
| 246 | recalc_sigpending(); |
| 247 | spin_unlock_irq(¤t->sighand->siglock); |
| 248 | |
David Woodhouse | 150256d | 2006-01-18 17:43:57 -0800 | [diff] [blame] | 249 | current->state = TASK_INTERRUPTIBLE; |
| 250 | schedule(); |
| 251 | set_thread_flag(TIF_RESTORE_SIGMASK); |
| 252 | return -ERESTARTNOHAND; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 253 | } |
| 254 | |
| 255 | #ifdef CONFIG_PPC32 |
| 256 | long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, int r5, |
| 257 | int r6, int r7, int r8, struct pt_regs *regs) |
| 258 | { |
| 259 | return do_sigaltstack(uss, uoss, regs->gpr[1]); |
| 260 | } |
| 261 | #endif |
| 262 | |
| 263 | long sys_sigaction(int sig, struct old_sigaction __user *act, |
| 264 | struct old_sigaction __user *oact) |
| 265 | { |
| 266 | struct k_sigaction new_ka, old_ka; |
| 267 | int ret; |
| 268 | |
| 269 | #ifdef CONFIG_PPC64 |
| 270 | if (sig < 0) |
| 271 | sig = -sig; |
| 272 | #endif |
| 273 | |
| 274 | if (act) { |
| 275 | if (get_old_sigaction(&new_ka, act)) |
| 276 | return -EFAULT; |
| 277 | } |
| 278 | |
| 279 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 280 | if (!ret && oact) { |
| 281 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || |
| 282 | __put_user(to_user_ptr(old_ka.sa.sa_handler), |
| 283 | &oact->sa_handler) || |
| 284 | __put_user(to_user_ptr(old_ka.sa.sa_restorer), |
| 285 | &oact->sa_restorer) || |
| 286 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || |
| 287 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) |
| 288 | return -EFAULT; |
| 289 | } |
| 290 | |
| 291 | return ret; |
| 292 | } |
| 293 | |
| 294 | /* |
| 295 | * When we have signals to deliver, we set up on the |
| 296 | * user stack, going down from the original stack pointer: |
| 297 | * a sigregs struct |
| 298 | * a sigcontext struct |
| 299 | * a gap of __SIGNAL_FRAMESIZE bytes |
| 300 | * |
| 301 | * Each of these things must be a multiple of 16 bytes in size. |
| 302 | * |
| 303 | */ |
| 304 | struct sigregs { |
| 305 | struct mcontext mctx; /* all the register values */ |
| 306 | /* |
| 307 | * Programs using the rs6000/xcoff abi can save up to 19 gp |
| 308 | * regs and 18 fp regs below sp before decrementing it. |
| 309 | */ |
| 310 | int abigap[56]; |
| 311 | }; |
| 312 | |
| 313 | /* We use the mc_pad field for the signal return trampoline. */ |
| 314 | #define tramp mc_pad |
| 315 | |
| 316 | /* |
| 317 | * When we have rt signals to deliver, we set up on the |
| 318 | * user stack, going down from the original stack pointer: |
| 319 | * one rt_sigframe struct (siginfo + ucontext + ABI gap) |
| 320 | * a gap of __SIGNAL_FRAMESIZE+16 bytes |
| 321 | * (the +16 is to get the siginfo and ucontext in the same |
| 322 | * positions as in older kernels). |
| 323 | * |
| 324 | * Each of these things must be a multiple of 16 bytes in size. |
| 325 | * |
| 326 | */ |
| 327 | struct rt_sigframe { |
| 328 | #ifdef CONFIG_PPC64 |
| 329 | compat_siginfo_t info; |
| 330 | #else |
| 331 | struct siginfo info; |
| 332 | #endif |
| 333 | struct ucontext uc; |
| 334 | /* |
| 335 | * Programs using the rs6000/xcoff abi can save up to 19 gp |
| 336 | * regs and 18 fp regs below sp before decrementing it. |
| 337 | */ |
| 338 | int abigap[56]; |
| 339 | }; |
| 340 | |
| 341 | /* |
| 342 | * Save the current user registers on the user stack. |
| 343 | * We only save the altivec/spe registers if the process has used |
| 344 | * altivec/spe instructions at some point. |
| 345 | */ |
| 346 | static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame, |
| 347 | int sigret) |
| 348 | { |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 349 | /* Make sure floating point registers are stored in regs */ |
| 350 | flush_fp_to_thread(current); |
| 351 | |
| 352 | /* save general and floating-point registers */ |
| 353 | if (save_general_regs(regs, frame) || |
| 354 | __copy_to_user(&frame->mc_fregs, current->thread.fpr, |
| 355 | ELF_NFPREG * sizeof(double))) |
| 356 | return 1; |
| 357 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 358 | #ifdef CONFIG_ALTIVEC |
| 359 | /* save altivec registers */ |
| 360 | if (current->thread.used_vr) { |
| 361 | flush_altivec_to_thread(current); |
| 362 | if (__copy_to_user(&frame->mc_vregs, current->thread.vr, |
| 363 | ELF_NVRREG * sizeof(vector128))) |
| 364 | return 1; |
| 365 | /* set MSR_VEC in the saved MSR value to indicate that |
| 366 | frame->mc_vregs contains valid data */ |
| 367 | if (__put_user(regs->msr | MSR_VEC, &frame->mc_gregs[PT_MSR])) |
| 368 | return 1; |
| 369 | } |
| 370 | /* else assert((regs->msr & MSR_VEC) == 0) */ |
| 371 | |
| 372 | /* We always copy to/from vrsave, it's 0 if we don't have or don't |
| 373 | * use altivec. Since VSCR only contains 32 bits saved in the least |
| 374 | * significant bits of a vector, we "cheat" and stuff VRSAVE in the |
| 375 | * most significant bits of that same vector. --BenH |
| 376 | */ |
| 377 | if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32])) |
| 378 | return 1; |
| 379 | #endif /* CONFIG_ALTIVEC */ |
| 380 | |
| 381 | #ifdef CONFIG_SPE |
| 382 | /* save spe registers */ |
| 383 | if (current->thread.used_spe) { |
| 384 | flush_spe_to_thread(current); |
| 385 | if (__copy_to_user(&frame->mc_vregs, current->thread.evr, |
| 386 | ELF_NEVRREG * sizeof(u32))) |
| 387 | return 1; |
| 388 | /* set MSR_SPE in the saved MSR value to indicate that |
| 389 | frame->mc_vregs contains valid data */ |
| 390 | if (__put_user(regs->msr | MSR_SPE, &frame->mc_gregs[PT_MSR])) |
| 391 | return 1; |
| 392 | } |
| 393 | /* else assert((regs->msr & MSR_SPE) == 0) */ |
| 394 | |
| 395 | /* We always copy to/from spefscr */ |
| 396 | if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG)) |
| 397 | return 1; |
| 398 | #endif /* CONFIG_SPE */ |
| 399 | |
| 400 | if (sigret) { |
| 401 | /* Set up the sigreturn trampoline: li r0,sigret; sc */ |
| 402 | if (__put_user(0x38000000UL + sigret, &frame->tramp[0]) |
| 403 | || __put_user(0x44000002UL, &frame->tramp[1])) |
| 404 | return 1; |
| 405 | flush_icache_range((unsigned long) &frame->tramp[0], |
| 406 | (unsigned long) &frame->tramp[2]); |
| 407 | } |
| 408 | |
| 409 | return 0; |
| 410 | } |
| 411 | |
| 412 | /* |
| 413 | * Restore the current user register values from the user stack, |
| 414 | * (except for MSR). |
| 415 | */ |
| 416 | static long restore_user_regs(struct pt_regs *regs, |
| 417 | struct mcontext __user *sr, int sig) |
| 418 | { |
| 419 | long err; |
| 420 | unsigned int save_r2 = 0; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 421 | unsigned long msr; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 422 | |
| 423 | /* |
| 424 | * restore general registers but not including MSR or SOFTE. Also |
| 425 | * take care of keeping r2 (TLS) intact if not a signal |
| 426 | */ |
| 427 | if (!sig) |
| 428 | save_r2 = (unsigned int)regs->gpr[2]; |
| 429 | err = restore_general_regs(regs, sr); |
Paul Mackerras | fab5db9 | 2006-06-07 16:14:40 +1000 | [diff] [blame] | 430 | err |= __get_user(msr, &sr->mc_gregs[PT_MSR]); |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 431 | if (!sig) |
| 432 | regs->gpr[2] = (unsigned long) save_r2; |
| 433 | if (err) |
| 434 | return 1; |
| 435 | |
Paul Mackerras | fab5db9 | 2006-06-07 16:14:40 +1000 | [diff] [blame] | 436 | /* if doing signal return, restore the previous little-endian mode */ |
| 437 | if (sig) |
| 438 | regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE); |
| 439 | |
Paul Mackerras | 5388fb1 | 2006-01-11 22:11:39 +1100 | [diff] [blame] | 440 | /* |
| 441 | * Do this before updating the thread state in |
| 442 | * current->thread.fpr/vr/evr. That way, if we get preempted |
| 443 | * and another task grabs the FPU/Altivec/SPE, it won't be |
| 444 | * tempted to save the current CPU state into the thread_struct |
| 445 | * and corrupt what we are writing there. |
| 446 | */ |
| 447 | discard_lazy_cpu_state(); |
| 448 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 449 | /* force the process to reload the FP registers from |
| 450 | current->thread when it next does FP instructions */ |
| 451 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1); |
| 452 | if (__copy_from_user(current->thread.fpr, &sr->mc_fregs, |
| 453 | sizeof(sr->mc_fregs))) |
| 454 | return 1; |
| 455 | |
| 456 | #ifdef CONFIG_ALTIVEC |
| 457 | /* force the process to reload the altivec registers from |
| 458 | current->thread when it next does altivec instructions */ |
| 459 | regs->msr &= ~MSR_VEC; |
Paul Mackerras | fab5db9 | 2006-06-07 16:14:40 +1000 | [diff] [blame] | 460 | if (msr & MSR_VEC) { |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 461 | /* restore altivec registers from the stack */ |
| 462 | if (__copy_from_user(current->thread.vr, &sr->mc_vregs, |
| 463 | sizeof(sr->mc_vregs))) |
| 464 | return 1; |
| 465 | } else if (current->thread.used_vr) |
| 466 | memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128)); |
| 467 | |
| 468 | /* Always get VRSAVE back */ |
| 469 | if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32])) |
| 470 | return 1; |
| 471 | #endif /* CONFIG_ALTIVEC */ |
| 472 | |
| 473 | #ifdef CONFIG_SPE |
| 474 | /* force the process to reload the spe registers from |
| 475 | current->thread when it next does spe instructions */ |
| 476 | regs->msr &= ~MSR_SPE; |
Paul Mackerras | fab5db9 | 2006-06-07 16:14:40 +1000 | [diff] [blame] | 477 | if (msr & MSR_SPE) { |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 478 | /* restore spe registers from the stack */ |
| 479 | if (__copy_from_user(current->thread.evr, &sr->mc_vregs, |
| 480 | ELF_NEVRREG * sizeof(u32))) |
| 481 | return 1; |
| 482 | } else if (current->thread.used_spe) |
| 483 | memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32)); |
| 484 | |
| 485 | /* Always get SPEFSCR back */ |
| 486 | if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG)) |
| 487 | return 1; |
| 488 | #endif /* CONFIG_SPE */ |
| 489 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 490 | return 0; |
| 491 | } |
| 492 | |
| 493 | #ifdef CONFIG_PPC64 |
Stephen Rothwell | b09a491 | 2005-10-18 14:51:57 +1000 | [diff] [blame] | 494 | long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act, |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 495 | struct sigaction32 __user *oact, size_t sigsetsize) |
| 496 | { |
| 497 | struct k_sigaction new_ka, old_ka; |
| 498 | int ret; |
| 499 | |
| 500 | /* XXX: Don't preclude handling different sized sigset_t's. */ |
| 501 | if (sigsetsize != sizeof(compat_sigset_t)) |
| 502 | return -EINVAL; |
| 503 | |
| 504 | if (act) { |
| 505 | compat_uptr_t handler; |
| 506 | |
| 507 | ret = get_user(handler, &act->sa_handler); |
| 508 | new_ka.sa.sa_handler = compat_ptr(handler); |
| 509 | ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask); |
| 510 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
| 511 | if (ret) |
| 512 | return -EFAULT; |
| 513 | } |
| 514 | |
| 515 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 516 | if (!ret && oact) { |
Al Viro | 29e646d | 2006-02-01 05:28:09 -0500 | [diff] [blame] | 517 | ret = put_user(to_user_ptr(old_ka.sa.sa_handler), &oact->sa_handler); |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 518 | ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask); |
| 519 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
| 520 | } |
| 521 | return ret; |
| 522 | } |
| 523 | |
| 524 | /* |
| 525 | * Note: it is necessary to treat how as an unsigned int, with the |
| 526 | * corresponding cast to a signed int to insure that the proper |
| 527 | * conversion (sign extension) between the register representation |
| 528 | * of a signed int (msr in 32-bit mode) and the register representation |
| 529 | * of a signed int (msr in 64-bit mode) is performed. |
| 530 | */ |
Stephen Rothwell | b09a491 | 2005-10-18 14:51:57 +1000 | [diff] [blame] | 531 | long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set, |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 532 | compat_sigset_t __user *oset, size_t sigsetsize) |
| 533 | { |
| 534 | sigset_t s; |
| 535 | sigset_t __user *up; |
| 536 | int ret; |
| 537 | mm_segment_t old_fs = get_fs(); |
| 538 | |
| 539 | if (set) { |
| 540 | if (get_sigset_t(&s, set)) |
| 541 | return -EFAULT; |
| 542 | } |
| 543 | |
| 544 | set_fs(KERNEL_DS); |
| 545 | /* This is valid because of the set_fs() */ |
| 546 | up = (sigset_t __user *) &s; |
| 547 | ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL, |
| 548 | sigsetsize); |
| 549 | set_fs(old_fs); |
| 550 | if (ret) |
| 551 | return ret; |
| 552 | if (oset) { |
| 553 | if (put_sigset_t(oset, &s)) |
| 554 | return -EFAULT; |
| 555 | } |
| 556 | return 0; |
| 557 | } |
| 558 | |
Stephen Rothwell | b09a491 | 2005-10-18 14:51:57 +1000 | [diff] [blame] | 559 | long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 560 | { |
| 561 | sigset_t s; |
| 562 | int ret; |
| 563 | mm_segment_t old_fs = get_fs(); |
| 564 | |
| 565 | set_fs(KERNEL_DS); |
| 566 | /* The __user pointer cast is valid because of the set_fs() */ |
| 567 | ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); |
| 568 | set_fs(old_fs); |
| 569 | if (!ret) { |
| 570 | if (put_sigset_t(set, &s)) |
| 571 | return -EFAULT; |
| 572 | } |
| 573 | return ret; |
| 574 | } |
| 575 | |
| 576 | |
| 577 | int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s) |
| 578 | { |
| 579 | int err; |
| 580 | |
| 581 | if (!access_ok (VERIFY_WRITE, d, sizeof(*d))) |
| 582 | return -EFAULT; |
| 583 | |
| 584 | /* If you change siginfo_t structure, please be sure |
| 585 | * this code is fixed accordingly. |
| 586 | * It should never copy any pad contained in the structure |
| 587 | * to avoid security leaks, but must copy the generic |
| 588 | * 3 ints plus the relevant union member. |
| 589 | * This routine must convert siginfo from 64bit to 32bit as well |
| 590 | * at the same time. |
| 591 | */ |
| 592 | err = __put_user(s->si_signo, &d->si_signo); |
| 593 | err |= __put_user(s->si_errno, &d->si_errno); |
| 594 | err |= __put_user((short)s->si_code, &d->si_code); |
| 595 | if (s->si_code < 0) |
| 596 | err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad, |
| 597 | SI_PAD_SIZE32); |
| 598 | else switch(s->si_code >> 16) { |
| 599 | case __SI_CHLD >> 16: |
| 600 | err |= __put_user(s->si_pid, &d->si_pid); |
| 601 | err |= __put_user(s->si_uid, &d->si_uid); |
| 602 | err |= __put_user(s->si_utime, &d->si_utime); |
| 603 | err |= __put_user(s->si_stime, &d->si_stime); |
| 604 | err |= __put_user(s->si_status, &d->si_status); |
| 605 | break; |
| 606 | case __SI_FAULT >> 16: |
| 607 | err |= __put_user((unsigned int)(unsigned long)s->si_addr, |
| 608 | &d->si_addr); |
| 609 | break; |
| 610 | case __SI_POLL >> 16: |
| 611 | err |= __put_user(s->si_band, &d->si_band); |
| 612 | err |= __put_user(s->si_fd, &d->si_fd); |
| 613 | break; |
| 614 | case __SI_TIMER >> 16: |
| 615 | err |= __put_user(s->si_tid, &d->si_tid); |
| 616 | err |= __put_user(s->si_overrun, &d->si_overrun); |
| 617 | err |= __put_user(s->si_int, &d->si_int); |
| 618 | break; |
| 619 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ |
| 620 | case __SI_MESGQ >> 16: |
| 621 | err |= __put_user(s->si_int, &d->si_int); |
| 622 | /* fallthrough */ |
| 623 | case __SI_KILL >> 16: |
| 624 | default: |
| 625 | err |= __put_user(s->si_pid, &d->si_pid); |
| 626 | err |= __put_user(s->si_uid, &d->si_uid); |
| 627 | break; |
| 628 | } |
| 629 | return err; |
| 630 | } |
| 631 | |
| 632 | #define copy_siginfo_to_user copy_siginfo_to_user32 |
| 633 | |
| 634 | /* |
| 635 | * Note: it is necessary to treat pid and sig as unsigned ints, with the |
| 636 | * corresponding cast to a signed int to insure that the proper conversion |
| 637 | * (sign extension) between the register representation of a signed int |
| 638 | * (msr in 32-bit mode) and the register representation of a signed int |
| 639 | * (msr in 64-bit mode) is performed. |
| 640 | */ |
Stephen Rothwell | b09a491 | 2005-10-18 14:51:57 +1000 | [diff] [blame] | 641 | long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 642 | { |
| 643 | siginfo_t info; |
| 644 | int ret; |
| 645 | mm_segment_t old_fs = get_fs(); |
| 646 | |
| 647 | if (copy_from_user (&info, uinfo, 3*sizeof(int)) || |
| 648 | copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE32)) |
| 649 | return -EFAULT; |
| 650 | set_fs (KERNEL_DS); |
| 651 | /* The __user pointer cast is valid becasuse of the set_fs() */ |
| 652 | ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info); |
| 653 | set_fs (old_fs); |
| 654 | return ret; |
| 655 | } |
| 656 | /* |
| 657 | * Start Alternate signal stack support |
| 658 | * |
| 659 | * System Calls |
Stephen Rothwell | b09a491 | 2005-10-18 14:51:57 +1000 | [diff] [blame] | 660 | * sigaltatck compat_sys_sigaltstack |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 661 | */ |
| 662 | |
Stephen Rothwell | b09a491 | 2005-10-18 14:51:57 +1000 | [diff] [blame] | 663 | int compat_sys_sigaltstack(u32 __new, u32 __old, int r5, |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 664 | int r6, int r7, int r8, struct pt_regs *regs) |
| 665 | { |
Al Viro | 29e646d | 2006-02-01 05:28:09 -0500 | [diff] [blame] | 666 | stack_32_t __user * newstack = compat_ptr(__new); |
| 667 | stack_32_t __user * oldstack = compat_ptr(__old); |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 668 | stack_t uss, uoss; |
| 669 | int ret; |
| 670 | mm_segment_t old_fs; |
| 671 | unsigned long sp; |
| 672 | compat_uptr_t ss_sp; |
| 673 | |
| 674 | /* |
| 675 | * set sp to the user stack on entry to the system call |
| 676 | * the system call router sets R9 to the saved registers |
| 677 | */ |
| 678 | sp = regs->gpr[1]; |
| 679 | |
| 680 | /* Put new stack info in local 64 bit stack struct */ |
| 681 | if (newstack) { |
| 682 | if (get_user(ss_sp, &newstack->ss_sp) || |
| 683 | __get_user(uss.ss_flags, &newstack->ss_flags) || |
| 684 | __get_user(uss.ss_size, &newstack->ss_size)) |
| 685 | return -EFAULT; |
| 686 | uss.ss_sp = compat_ptr(ss_sp); |
| 687 | } |
| 688 | |
| 689 | old_fs = get_fs(); |
| 690 | set_fs(KERNEL_DS); |
| 691 | /* The __user pointer casts are valid because of the set_fs() */ |
| 692 | ret = do_sigaltstack( |
| 693 | newstack ? (stack_t __user *) &uss : NULL, |
| 694 | oldstack ? (stack_t __user *) &uoss : NULL, |
| 695 | sp); |
| 696 | set_fs(old_fs); |
| 697 | /* Copy the stack information to the user output buffer */ |
| 698 | if (!ret && oldstack && |
Al Viro | 29e646d | 2006-02-01 05:28:09 -0500 | [diff] [blame] | 699 | (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) || |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 700 | __put_user(uoss.ss_flags, &oldstack->ss_flags) || |
| 701 | __put_user(uoss.ss_size, &oldstack->ss_size))) |
| 702 | return -EFAULT; |
| 703 | return ret; |
| 704 | } |
| 705 | #endif /* CONFIG_PPC64 */ |
| 706 | |
| 707 | |
| 708 | /* |
| 709 | * Restore the user process's signal mask |
| 710 | */ |
| 711 | #ifdef CONFIG_PPC64 |
| 712 | extern void restore_sigmask(sigset_t *set); |
| 713 | #else /* CONFIG_PPC64 */ |
| 714 | static void restore_sigmask(sigset_t *set) |
| 715 | { |
| 716 | sigdelsetmask(set, ~_BLOCKABLE); |
| 717 | spin_lock_irq(¤t->sighand->siglock); |
| 718 | current->blocked = *set; |
| 719 | recalc_sigpending(); |
| 720 | spin_unlock_irq(¤t->sighand->siglock); |
| 721 | } |
| 722 | #endif |
| 723 | |
| 724 | /* |
| 725 | * Set up a signal frame for a "real-time" signal handler |
| 726 | * (one which gets siginfo). |
| 727 | */ |
| 728 | static int handle_rt_signal(unsigned long sig, struct k_sigaction *ka, |
| 729 | siginfo_t *info, sigset_t *oldset, |
| 730 | struct pt_regs *regs, unsigned long newsp) |
| 731 | { |
| 732 | struct rt_sigframe __user *rt_sf; |
| 733 | struct mcontext __user *frame; |
| 734 | unsigned long origsp = newsp; |
| 735 | |
| 736 | /* Set up Signal Frame */ |
| 737 | /* Put a Real Time Context onto stack */ |
| 738 | newsp -= sizeof(*rt_sf); |
| 739 | rt_sf = (struct rt_sigframe __user *)newsp; |
| 740 | |
| 741 | /* create a stack frame for the caller of the handler */ |
| 742 | newsp -= __SIGNAL_FRAMESIZE + 16; |
| 743 | |
| 744 | if (!access_ok(VERIFY_WRITE, (void __user *)newsp, origsp - newsp)) |
| 745 | goto badframe; |
| 746 | |
| 747 | /* Put the siginfo & fill in most of the ucontext */ |
| 748 | if (copy_siginfo_to_user(&rt_sf->info, info) |
| 749 | || __put_user(0, &rt_sf->uc.uc_flags) |
| 750 | || __put_user(0, &rt_sf->uc.uc_link) |
| 751 | || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp) |
| 752 | || __put_user(sas_ss_flags(regs->gpr[1]), |
| 753 | &rt_sf->uc.uc_stack.ss_flags) |
| 754 | || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size) |
| 755 | || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext), |
| 756 | &rt_sf->uc.uc_regs) |
| 757 | || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset)) |
| 758 | goto badframe; |
| 759 | |
| 760 | /* Save user registers on the stack */ |
| 761 | frame = &rt_sf->uc.uc_mcontext; |
Benjamin Herrenschmidt | a5bba93 | 2006-05-30 13:51:37 +1000 | [diff] [blame] | 762 | if (vdso32_rt_sigtramp && current->mm->context.vdso_base) { |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 763 | if (save_user_regs(regs, frame, 0)) |
| 764 | goto badframe; |
Benjamin Herrenschmidt | a5bba93 | 2006-05-30 13:51:37 +1000 | [diff] [blame] | 765 | regs->link = current->mm->context.vdso_base + vdso32_rt_sigtramp; |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 766 | } else { |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 767 | if (save_user_regs(regs, frame, __NR_rt_sigreturn)) |
| 768 | goto badframe; |
| 769 | regs->link = (unsigned long) frame->tramp; |
| 770 | } |
Paul Mackerras | cc657f5 | 2005-11-14 21:55:15 +1100 | [diff] [blame] | 771 | |
| 772 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ |
| 773 | |
Paul Mackerras | e2b5530 | 2005-10-22 14:46:33 +1000 | [diff] [blame] | 774 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 775 | goto badframe; |
| 776 | regs->gpr[1] = newsp; |
| 777 | regs->gpr[3] = sig; |
| 778 | regs->gpr[4] = (unsigned long) &rt_sf->info; |
| 779 | regs->gpr[5] = (unsigned long) &rt_sf->uc; |
| 780 | regs->gpr[6] = (unsigned long) rt_sf; |
| 781 | regs->nip = (unsigned long) ka->sa.sa_handler; |
Paul Mackerras | fab5db9 | 2006-06-07 16:14:40 +1000 | [diff] [blame] | 782 | /* enter the signal handler in big-endian mode */ |
| 783 | regs->msr &= ~MSR_LE; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 784 | regs->trap = 0; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 785 | return 1; |
| 786 | |
| 787 | badframe: |
| 788 | #ifdef DEBUG_SIG |
| 789 | printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n", |
| 790 | regs, frame, newsp); |
| 791 | #endif |
| 792 | force_sigsegv(sig, current); |
| 793 | return 0; |
| 794 | } |
| 795 | |
| 796 | static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig) |
| 797 | { |
| 798 | sigset_t set; |
| 799 | struct mcontext __user *mcp; |
| 800 | |
| 801 | if (get_sigset_t(&set, &ucp->uc_sigmask)) |
| 802 | return -EFAULT; |
| 803 | #ifdef CONFIG_PPC64 |
| 804 | { |
| 805 | u32 cmcp; |
| 806 | |
| 807 | if (__get_user(cmcp, &ucp->uc_regs)) |
| 808 | return -EFAULT; |
| 809 | mcp = (struct mcontext __user *)(u64)cmcp; |
Paul Mackerras | 7c85d1f | 2006-06-09 13:02:59 +1000 | [diff] [blame] | 810 | /* no need to check access_ok(mcp), since mcp < 4GB */ |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 811 | } |
| 812 | #else |
| 813 | if (__get_user(mcp, &ucp->uc_regs)) |
| 814 | return -EFAULT; |
Paul Mackerras | 7c85d1f | 2006-06-09 13:02:59 +1000 | [diff] [blame] | 815 | if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp))) |
| 816 | return -EFAULT; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 817 | #endif |
| 818 | restore_sigmask(&set); |
| 819 | if (restore_user_regs(regs, mcp, sig)) |
| 820 | return -EFAULT; |
| 821 | |
| 822 | return 0; |
| 823 | } |
| 824 | |
| 825 | long sys_swapcontext(struct ucontext __user *old_ctx, |
Paul Mackerras | 1bd7933 | 2006-03-08 13:24:22 +1100 | [diff] [blame] | 826 | struct ucontext __user *new_ctx, |
| 827 | int ctx_size, int r6, int r7, int r8, struct pt_regs *regs) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 828 | { |
| 829 | unsigned char tmp; |
| 830 | |
| 831 | /* Context size is for future use. Right now, we only make sure |
| 832 | * we are passed something we understand |
| 833 | */ |
| 834 | if (ctx_size < sizeof(struct ucontext)) |
| 835 | return -EINVAL; |
| 836 | |
| 837 | if (old_ctx != NULL) { |
| 838 | if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx)) |
| 839 | || save_user_regs(regs, &old_ctx->uc_mcontext, 0) |
| 840 | || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked) |
| 841 | || __put_user(to_user_ptr(&old_ctx->uc_mcontext), |
| 842 | &old_ctx->uc_regs)) |
| 843 | return -EFAULT; |
| 844 | } |
| 845 | if (new_ctx == NULL) |
| 846 | return 0; |
| 847 | if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx)) |
| 848 | || __get_user(tmp, (u8 __user *) new_ctx) |
| 849 | || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1)) |
| 850 | return -EFAULT; |
| 851 | |
| 852 | /* |
| 853 | * If we get a fault copying the context into the kernel's |
| 854 | * image of the user's registers, we can't just return -EFAULT |
| 855 | * because the user's registers will be corrupted. For instance |
| 856 | * the NIP value may have been updated but not some of the |
| 857 | * other registers. Given that we have done the access_ok |
| 858 | * and successfully read the first and last bytes of the region |
| 859 | * above, this should only happen in an out-of-memory situation |
| 860 | * or if another thread unmaps the region containing the context. |
| 861 | * We kill the task with a SIGSEGV in this situation. |
| 862 | */ |
| 863 | if (do_setcontext(new_ctx, regs, 0)) |
| 864 | do_exit(SIGSEGV); |
David Woodhouse | 401d1f0 | 2005-11-15 18:52:18 +0000 | [diff] [blame] | 865 | |
| 866 | set_thread_flag(TIF_RESTOREALL); |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 867 | return 0; |
| 868 | } |
| 869 | |
| 870 | long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
| 871 | struct pt_regs *regs) |
| 872 | { |
| 873 | struct rt_sigframe __user *rt_sf; |
| 874 | |
| 875 | /* Always make any pending restarted system calls return -EINTR */ |
| 876 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 877 | |
| 878 | rt_sf = (struct rt_sigframe __user *) |
| 879 | (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16); |
| 880 | if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf))) |
| 881 | goto bad; |
| 882 | if (do_setcontext(&rt_sf->uc, regs, 1)) |
| 883 | goto bad; |
| 884 | |
| 885 | /* |
| 886 | * It's not clear whether or why it is desirable to save the |
| 887 | * sigaltstack setting on signal delivery and restore it on |
| 888 | * signal return. But other architectures do this and we have |
| 889 | * always done it up until now so it is probably better not to |
| 890 | * change it. -- paulus |
| 891 | */ |
| 892 | #ifdef CONFIG_PPC64 |
| 893 | /* |
Stephen Rothwell | b09a491 | 2005-10-18 14:51:57 +1000 | [diff] [blame] | 894 | * We use the compat_sys_ version that does the 32/64 bits conversion |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 895 | * and takes userland pointer directly. What about error checking ? |
| 896 | * nobody does any... |
| 897 | */ |
Stephen Rothwell | b09a491 | 2005-10-18 14:51:57 +1000 | [diff] [blame] | 898 | compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs); |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 899 | #else |
| 900 | do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]); |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 901 | #endif |
David Woodhouse | 401d1f0 | 2005-11-15 18:52:18 +0000 | [diff] [blame] | 902 | set_thread_flag(TIF_RESTOREALL); |
| 903 | return 0; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 904 | |
| 905 | bad: |
| 906 | force_sig(SIGSEGV, current); |
| 907 | return 0; |
| 908 | } |
| 909 | |
| 910 | #ifdef CONFIG_PPC32 |
| 911 | int sys_debug_setcontext(struct ucontext __user *ctx, |
| 912 | int ndbg, struct sig_dbg_op __user *dbg, |
| 913 | int r6, int r7, int r8, |
| 914 | struct pt_regs *regs) |
| 915 | { |
| 916 | struct sig_dbg_op op; |
| 917 | int i; |
Paul Mackerras | 7c85d1f | 2006-06-09 13:02:59 +1000 | [diff] [blame] | 918 | unsigned char tmp; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 919 | unsigned long new_msr = regs->msr; |
| 920 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) |
| 921 | unsigned long new_dbcr0 = current->thread.dbcr0; |
| 922 | #endif |
| 923 | |
| 924 | for (i=0; i<ndbg; i++) { |
Paul Mackerras | 7c85d1f | 2006-06-09 13:02:59 +1000 | [diff] [blame] | 925 | if (copy_from_user(&op, dbg + i, sizeof(op))) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 926 | return -EFAULT; |
| 927 | switch (op.dbg_type) { |
| 928 | case SIG_DBG_SINGLE_STEPPING: |
| 929 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) |
| 930 | if (op.dbg_value) { |
| 931 | new_msr |= MSR_DE; |
| 932 | new_dbcr0 |= (DBCR0_IDM | DBCR0_IC); |
| 933 | } else { |
| 934 | new_msr &= ~MSR_DE; |
| 935 | new_dbcr0 &= ~(DBCR0_IDM | DBCR0_IC); |
| 936 | } |
| 937 | #else |
| 938 | if (op.dbg_value) |
| 939 | new_msr |= MSR_SE; |
| 940 | else |
| 941 | new_msr &= ~MSR_SE; |
| 942 | #endif |
| 943 | break; |
| 944 | case SIG_DBG_BRANCH_TRACING: |
| 945 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) |
| 946 | return -EINVAL; |
| 947 | #else |
| 948 | if (op.dbg_value) |
| 949 | new_msr |= MSR_BE; |
| 950 | else |
| 951 | new_msr &= ~MSR_BE; |
| 952 | #endif |
| 953 | break; |
| 954 | |
| 955 | default: |
| 956 | return -EINVAL; |
| 957 | } |
| 958 | } |
| 959 | |
| 960 | /* We wait until here to actually install the values in the |
| 961 | registers so if we fail in the above loop, it will not |
| 962 | affect the contents of these registers. After this point, |
| 963 | failure is a problem, anyway, and it's very unlikely unless |
| 964 | the user is really doing something wrong. */ |
| 965 | regs->msr = new_msr; |
| 966 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) |
| 967 | current->thread.dbcr0 = new_dbcr0; |
| 968 | #endif |
| 969 | |
Paul Mackerras | 7c85d1f | 2006-06-09 13:02:59 +1000 | [diff] [blame] | 970 | if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)) |
| 971 | || __get_user(tmp, (u8 __user *) ctx) |
| 972 | || __get_user(tmp, (u8 __user *) (ctx + 1) - 1)) |
| 973 | return -EFAULT; |
| 974 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 975 | /* |
| 976 | * If we get a fault copying the context into the kernel's |
| 977 | * image of the user's registers, we can't just return -EFAULT |
| 978 | * because the user's registers will be corrupted. For instance |
| 979 | * the NIP value may have been updated but not some of the |
| 980 | * other registers. Given that we have done the access_ok |
| 981 | * and successfully read the first and last bytes of the region |
| 982 | * above, this should only happen in an out-of-memory situation |
| 983 | * or if another thread unmaps the region containing the context. |
| 984 | * We kill the task with a SIGSEGV in this situation. |
| 985 | */ |
| 986 | if (do_setcontext(ctx, regs, 1)) { |
| 987 | force_sig(SIGSEGV, current); |
| 988 | goto out; |
| 989 | } |
| 990 | |
| 991 | /* |
| 992 | * It's not clear whether or why it is desirable to save the |
| 993 | * sigaltstack setting on signal delivery and restore it on |
| 994 | * signal return. But other architectures do this and we have |
| 995 | * always done it up until now so it is probably better not to |
| 996 | * change it. -- paulus |
| 997 | */ |
| 998 | do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]); |
| 999 | |
David Woodhouse | 401d1f0 | 2005-11-15 18:52:18 +0000 | [diff] [blame] | 1000 | set_thread_flag(TIF_RESTOREALL); |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1001 | out: |
| 1002 | return 0; |
| 1003 | } |
| 1004 | #endif |
| 1005 | |
| 1006 | /* |
| 1007 | * OK, we're invoking a handler |
| 1008 | */ |
| 1009 | static int handle_signal(unsigned long sig, struct k_sigaction *ka, |
| 1010 | siginfo_t *info, sigset_t *oldset, struct pt_regs *regs, |
| 1011 | unsigned long newsp) |
| 1012 | { |
| 1013 | struct sigcontext __user *sc; |
| 1014 | struct sigregs __user *frame; |
| 1015 | unsigned long origsp = newsp; |
| 1016 | |
| 1017 | /* Set up Signal Frame */ |
| 1018 | newsp -= sizeof(struct sigregs); |
| 1019 | frame = (struct sigregs __user *) newsp; |
| 1020 | |
| 1021 | /* Put a sigcontext on the stack */ |
| 1022 | newsp -= sizeof(*sc); |
| 1023 | sc = (struct sigcontext __user *) newsp; |
| 1024 | |
| 1025 | /* create a stack frame for the caller of the handler */ |
| 1026 | newsp -= __SIGNAL_FRAMESIZE; |
| 1027 | |
| 1028 | if (!access_ok(VERIFY_WRITE, (void __user *) newsp, origsp - newsp)) |
| 1029 | goto badframe; |
| 1030 | |
| 1031 | #if _NSIG != 64 |
| 1032 | #error "Please adjust handle_signal()" |
| 1033 | #endif |
| 1034 | if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler) |
| 1035 | || __put_user(oldset->sig[0], &sc->oldmask) |
| 1036 | #ifdef CONFIG_PPC64 |
| 1037 | || __put_user((oldset->sig[0] >> 32), &sc->_unused[3]) |
| 1038 | #else |
| 1039 | || __put_user(oldset->sig[1], &sc->_unused[3]) |
| 1040 | #endif |
| 1041 | || __put_user(to_user_ptr(frame), &sc->regs) |
| 1042 | || __put_user(sig, &sc->signal)) |
| 1043 | goto badframe; |
| 1044 | |
Benjamin Herrenschmidt | a5bba93 | 2006-05-30 13:51:37 +1000 | [diff] [blame] | 1045 | if (vdso32_sigtramp && current->mm->context.vdso_base) { |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1046 | if (save_user_regs(regs, &frame->mctx, 0)) |
| 1047 | goto badframe; |
Benjamin Herrenschmidt | a5bba93 | 2006-05-30 13:51:37 +1000 | [diff] [blame] | 1048 | regs->link = current->mm->context.vdso_base + vdso32_sigtramp; |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 1049 | } else { |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1050 | if (save_user_regs(regs, &frame->mctx, __NR_sigreturn)) |
| 1051 | goto badframe; |
| 1052 | regs->link = (unsigned long) frame->mctx.tramp; |
| 1053 | } |
| 1054 | |
Paul Mackerras | cc657f5 | 2005-11-14 21:55:15 +1100 | [diff] [blame] | 1055 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ |
| 1056 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1057 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
| 1058 | goto badframe; |
| 1059 | regs->gpr[1] = newsp; |
| 1060 | regs->gpr[3] = sig; |
| 1061 | regs->gpr[4] = (unsigned long) sc; |
| 1062 | regs->nip = (unsigned long) ka->sa.sa_handler; |
Paul Mackerras | fab5db9 | 2006-06-07 16:14:40 +1000 | [diff] [blame] | 1063 | /* enter the signal handler in big-endian mode */ |
| 1064 | regs->msr &= ~MSR_LE; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1065 | regs->trap = 0; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1066 | |
| 1067 | return 1; |
| 1068 | |
| 1069 | badframe: |
| 1070 | #ifdef DEBUG_SIG |
| 1071 | printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n", |
| 1072 | regs, frame, newsp); |
| 1073 | #endif |
| 1074 | force_sigsegv(sig, current); |
| 1075 | return 0; |
| 1076 | } |
| 1077 | |
| 1078 | /* |
| 1079 | * Do a signal return; undo the signal stack. |
| 1080 | */ |
| 1081 | long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
| 1082 | struct pt_regs *regs) |
| 1083 | { |
| 1084 | struct sigcontext __user *sc; |
| 1085 | struct sigcontext sigctx; |
| 1086 | struct mcontext __user *sr; |
| 1087 | sigset_t set; |
| 1088 | |
| 1089 | /* Always make any pending restarted system calls return -EINTR */ |
| 1090 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 1091 | |
| 1092 | sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE); |
| 1093 | if (copy_from_user(&sigctx, sc, sizeof(sigctx))) |
| 1094 | goto badframe; |
| 1095 | |
| 1096 | #ifdef CONFIG_PPC64 |
| 1097 | /* |
| 1098 | * Note that PPC32 puts the upper 32 bits of the sigmask in the |
| 1099 | * unused part of the signal stackframe |
| 1100 | */ |
| 1101 | set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32); |
| 1102 | #else |
| 1103 | set.sig[0] = sigctx.oldmask; |
| 1104 | set.sig[1] = sigctx._unused[3]; |
| 1105 | #endif |
| 1106 | restore_sigmask(&set); |
| 1107 | |
| 1108 | sr = (struct mcontext __user *)from_user_ptr(sigctx.regs); |
| 1109 | if (!access_ok(VERIFY_READ, sr, sizeof(*sr)) |
| 1110 | || restore_user_regs(regs, sr, 1)) |
| 1111 | goto badframe; |
| 1112 | |
David Woodhouse | 401d1f0 | 2005-11-15 18:52:18 +0000 | [diff] [blame] | 1113 | set_thread_flag(TIF_RESTOREALL); |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1114 | return 0; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1115 | |
| 1116 | badframe: |
| 1117 | force_sig(SIGSEGV, current); |
| 1118 | return 0; |
| 1119 | } |
| 1120 | |
| 1121 | /* |
| 1122 | * Note that 'init' is a special process: it doesn't get signals it doesn't |
| 1123 | * want to handle. Thus you cannot kill init even with a SIGKILL even by |
| 1124 | * mistake. |
| 1125 | */ |
| 1126 | int do_signal(sigset_t *oldset, struct pt_regs *regs) |
| 1127 | { |
| 1128 | siginfo_t info; |
| 1129 | struct k_sigaction ka; |
David Woodhouse | f27201d | 2006-01-18 17:44:01 -0800 | [diff] [blame] | 1130 | unsigned int newsp; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1131 | int signr, ret; |
| 1132 | |
| 1133 | #ifdef CONFIG_PPC32 |
| 1134 | if (try_to_freeze()) { |
| 1135 | signr = 0; |
| 1136 | if (!signal_pending(current)) |
| 1137 | goto no_signal; |
| 1138 | } |
| 1139 | #endif |
| 1140 | |
David Woodhouse | f27201d | 2006-01-18 17:44:01 -0800 | [diff] [blame] | 1141 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
| 1142 | oldset = ¤t->saved_sigmask; |
| 1143 | else if (!oldset) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1144 | oldset = ¤t->blocked; |
| 1145 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1146 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
| 1147 | #ifdef CONFIG_PPC32 |
| 1148 | no_signal: |
| 1149 | #endif |
| 1150 | if (TRAP(regs) == 0x0C00 /* System Call! */ |
| 1151 | && regs->ccr & 0x10000000 /* error signalled */ |
| 1152 | && ((ret = regs->gpr[3]) == ERESTARTSYS |
| 1153 | || ret == ERESTARTNOHAND || ret == ERESTARTNOINTR |
| 1154 | || ret == ERESTART_RESTARTBLOCK)) { |
| 1155 | |
| 1156 | if (signr > 0 |
| 1157 | && (ret == ERESTARTNOHAND || ret == ERESTART_RESTARTBLOCK |
| 1158 | || (ret == ERESTARTSYS |
| 1159 | && !(ka.sa.sa_flags & SA_RESTART)))) { |
| 1160 | /* make the system call return an EINTR error */ |
| 1161 | regs->result = -EINTR; |
| 1162 | regs->gpr[3] = EINTR; |
| 1163 | /* note that the cr0.SO bit is already set */ |
| 1164 | } else { |
| 1165 | regs->nip -= 4; /* Back up & retry system call */ |
| 1166 | regs->result = 0; |
| 1167 | regs->trap = 0; |
| 1168 | if (ret == ERESTART_RESTARTBLOCK) |
| 1169 | regs->gpr[0] = __NR_restart_syscall; |
| 1170 | else |
| 1171 | regs->gpr[3] = regs->orig_gpr3; |
| 1172 | } |
| 1173 | } |
| 1174 | |
David Woodhouse | f27201d | 2006-01-18 17:44:01 -0800 | [diff] [blame] | 1175 | if (signr == 0) { |
| 1176 | /* No signal to deliver -- put the saved sigmask back */ |
| 1177 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { |
| 1178 | clear_thread_flag(TIF_RESTORE_SIGMASK); |
| 1179 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); |
| 1180 | } |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1181 | return 0; /* no signals delivered */ |
David Woodhouse | f27201d | 2006-01-18 17:44:01 -0800 | [diff] [blame] | 1182 | } |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1183 | |
| 1184 | if ((ka.sa.sa_flags & SA_ONSTACK) && current->sas_ss_size |
| 1185 | && !on_sig_stack(regs->gpr[1])) |
| 1186 | newsp = current->sas_ss_sp + current->sas_ss_size; |
| 1187 | else |
| 1188 | newsp = regs->gpr[1]; |
| 1189 | newsp &= ~0xfUL; |
| 1190 | |
| 1191 | #ifdef CONFIG_PPC64 |
| 1192 | /* |
| 1193 | * Reenable the DABR before delivering the signal to |
| 1194 | * user space. The DABR will have been cleared if it |
| 1195 | * triggered inside the kernel. |
| 1196 | */ |
| 1197 | if (current->thread.dabr) |
| 1198 | set_dabr(current->thread.dabr); |
| 1199 | #endif |
| 1200 | |
| 1201 | /* Whee! Actually deliver the signal. */ |
| 1202 | if (ka.sa.sa_flags & SA_SIGINFO) |
| 1203 | ret = handle_rt_signal(signr, &ka, &info, oldset, regs, newsp); |
| 1204 | else |
| 1205 | ret = handle_signal(signr, &ka, &info, oldset, regs, newsp); |
| 1206 | |
| 1207 | if (ret) { |
| 1208 | spin_lock_irq(¤t->sighand->siglock); |
| 1209 | sigorsets(¤t->blocked, ¤t->blocked, |
| 1210 | &ka.sa.sa_mask); |
| 1211 | if (!(ka.sa.sa_flags & SA_NODEFER)) |
| 1212 | sigaddset(¤t->blocked, signr); |
| 1213 | recalc_sigpending(); |
| 1214 | spin_unlock_irq(¤t->sighand->siglock); |
David Woodhouse | f27201d | 2006-01-18 17:44:01 -0800 | [diff] [blame] | 1215 | /* A signal was successfully delivered; the saved sigmask is in |
| 1216 | its frame, and we can clear the TIF_RESTORE_SIGMASK flag */ |
| 1217 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
| 1218 | clear_thread_flag(TIF_RESTORE_SIGMASK); |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1219 | } |
| 1220 | |
| 1221 | return ret; |
| 1222 | } |