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> |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 23 | #include <linux/kernel.h> |
| 24 | #include <linux/signal.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/elf.h> |
Lucas Woods | 05ead01 | 2007-12-13 15:56:06 -0800 | [diff] [blame] | 27 | #include <linux/ptrace.h> |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 28 | #ifdef CONFIG_PPC64 |
| 29 | #include <linux/syscalls.h> |
| 30 | #include <linux/compat.h> |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 31 | #else |
| 32 | #include <linux/wait.h> |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 33 | #include <linux/unistd.h> |
| 34 | #include <linux/stddef.h> |
| 35 | #include <linux/tty.h> |
| 36 | #include <linux/binfmts.h> |
Nigel Cunningham | 7dfb710 | 2006-12-06 20:34:23 -0800 | [diff] [blame] | 37 | #include <linux/freezer.h> |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 38 | #endif |
| 39 | |
| 40 | #include <asm/uaccess.h> |
| 41 | #include <asm/cacheflush.h> |
Arnd Bergmann | a7f3184 | 2006-03-23 00:00:08 +0100 | [diff] [blame] | 42 | #include <asm/syscalls.h> |
David Gibson | c5ff700 | 2005-11-09 11:21:07 +1100 | [diff] [blame] | 43 | #include <asm/sigcontext.h> |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 44 | #include <asm/vdso.h> |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 45 | #ifdef CONFIG_PPC64 |
Stephen Rothwell | 879168e | 2005-11-03 15:32:07 +1100 | [diff] [blame] | 46 | #include "ppc32.h" |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 47 | #include <asm/unistd.h> |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 48 | #else |
| 49 | #include <asm/ucontext.h> |
| 50 | #include <asm/pgtable.h> |
| 51 | #endif |
| 52 | |
Benjamin Herrenschmidt | 22e38f2 | 2007-06-04 15:15:49 +1000 | [diff] [blame] | 53 | #include "signal.h" |
| 54 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 55 | #undef DEBUG_SIG |
| 56 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 57 | #ifdef CONFIG_PPC64 |
Stephen Rothwell | b09a491 | 2005-10-18 14:51:57 +1000 | [diff] [blame] | 58 | #define sys_sigsuspend compat_sys_sigsuspend |
| 59 | #define sys_rt_sigsuspend compat_sys_rt_sigsuspend |
| 60 | #define sys_rt_sigreturn compat_sys_rt_sigreturn |
| 61 | #define sys_sigaction compat_sys_sigaction |
| 62 | #define sys_swapcontext compat_sys_swapcontext |
| 63 | #define sys_sigreturn compat_sys_sigreturn |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 64 | |
| 65 | #define old_sigaction old_sigaction32 |
| 66 | #define sigcontext sigcontext32 |
| 67 | #define mcontext mcontext32 |
| 68 | #define ucontext ucontext32 |
| 69 | |
| 70 | /* |
Michael Neuling | c1cb299 | 2008-07-08 18:43:41 +1000 | [diff] [blame] | 71 | * Userspace code may pass a ucontext which doesn't include VSX added |
| 72 | * at the end. We need to check for this case. |
| 73 | */ |
| 74 | #define UCONTEXTSIZEWITHOUTVSX \ |
| 75 | (sizeof(struct ucontext) - sizeof(elf_vsrreghalf_t32)) |
| 76 | |
| 77 | /* |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 78 | * Returning 0 means we return to userspace via |
| 79 | * ret_from_except and thus restore all user |
| 80 | * registers from *regs. This is what we need |
| 81 | * to do when a signal has been delivered. |
| 82 | */ |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 83 | |
| 84 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32)) |
| 85 | #undef __SIGNAL_FRAMESIZE |
| 86 | #define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32 |
| 87 | #undef ELF_NVRREG |
| 88 | #define ELF_NVRREG ELF_NVRREG32 |
| 89 | |
| 90 | /* |
| 91 | * Functions for flipping sigsets (thanks to brain dead generic |
| 92 | * implementation that makes things simple for little endian only) |
| 93 | */ |
| 94 | static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set) |
| 95 | { |
| 96 | compat_sigset_t cset; |
| 97 | |
| 98 | switch (_NSIG_WORDS) { |
| 99 | case 4: cset.sig[5] = set->sig[3] & 0xffffffffull; |
| 100 | cset.sig[7] = set->sig[3] >> 32; |
| 101 | case 3: cset.sig[4] = set->sig[2] & 0xffffffffull; |
| 102 | cset.sig[5] = set->sig[2] >> 32; |
| 103 | case 2: cset.sig[2] = set->sig[1] & 0xffffffffull; |
| 104 | cset.sig[3] = set->sig[1] >> 32; |
| 105 | case 1: cset.sig[0] = set->sig[0] & 0xffffffffull; |
| 106 | cset.sig[1] = set->sig[0] >> 32; |
| 107 | } |
| 108 | return copy_to_user(uset, &cset, sizeof(*uset)); |
| 109 | } |
| 110 | |
Paul Mackerras | 9b7cf8b | 2005-10-19 23:13:04 +1000 | [diff] [blame] | 111 | static inline int get_sigset_t(sigset_t *set, |
| 112 | const compat_sigset_t __user *uset) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 113 | { |
| 114 | compat_sigset_t s32; |
| 115 | |
| 116 | if (copy_from_user(&s32, uset, sizeof(*uset))) |
| 117 | return -EFAULT; |
| 118 | |
| 119 | /* |
| 120 | * Swap the 2 words of the 64-bit sigset_t (they are stored |
| 121 | * in the "wrong" endian in 32-bit user storage). |
| 122 | */ |
| 123 | switch (_NSIG_WORDS) { |
| 124 | case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32); |
| 125 | case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32); |
| 126 | case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32); |
| 127 | case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); |
| 128 | } |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | static inline int get_old_sigaction(struct k_sigaction *new_ka, |
| 133 | struct old_sigaction __user *act) |
| 134 | { |
| 135 | compat_old_sigset_t mask; |
| 136 | compat_uptr_t handler, restorer; |
| 137 | |
| 138 | if (get_user(handler, &act->sa_handler) || |
| 139 | __get_user(restorer, &act->sa_restorer) || |
| 140 | __get_user(new_ka->sa.sa_flags, &act->sa_flags) || |
| 141 | __get_user(mask, &act->sa_mask)) |
| 142 | return -EFAULT; |
| 143 | new_ka->sa.sa_handler = compat_ptr(handler); |
| 144 | new_ka->sa.sa_restorer = compat_ptr(restorer); |
| 145 | siginitset(&new_ka->sa.sa_mask, mask); |
| 146 | return 0; |
| 147 | } |
| 148 | |
Al Viro | 29e646df | 2006-02-01 05:28:09 -0500 | [diff] [blame] | 149 | #define to_user_ptr(p) ptr_to_compat(p) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 150 | #define from_user_ptr(p) compat_ptr(p) |
| 151 | |
| 152 | static inline int save_general_regs(struct pt_regs *regs, |
| 153 | struct mcontext __user *frame) |
| 154 | { |
| 155 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; |
| 156 | int i; |
| 157 | |
Paul Mackerras | 1bd7933 | 2006-03-08 13:24:22 +1100 | [diff] [blame] | 158 | WARN_ON(!FULL_REGS(regs)); |
David Woodhouse | 401d1f0 | 2005-11-15 18:52:18 +0000 | [diff] [blame] | 159 | |
| 160 | for (i = 0; i <= PT_RESULT; i ++) { |
| 161 | if (i == 14 && !FULL_REGS(regs)) |
| 162 | i = 32; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 163 | if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i])) |
| 164 | return -EFAULT; |
David Woodhouse | 401d1f0 | 2005-11-15 18:52:18 +0000 | [diff] [blame] | 165 | } |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | static inline int restore_general_regs(struct pt_regs *regs, |
| 170 | struct mcontext __user *sr) |
| 171 | { |
| 172 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; |
| 173 | int i; |
| 174 | |
| 175 | for (i = 0; i <= PT_RESULT; i++) { |
| 176 | if ((i == PT_MSR) || (i == PT_SOFTE)) |
| 177 | continue; |
| 178 | if (__get_user(gregs[i], &sr->mc_gregs[i])) |
| 179 | return -EFAULT; |
| 180 | } |
| 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | #else /* CONFIG_PPC64 */ |
| 185 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 186 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs)) |
| 187 | |
| 188 | static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set) |
| 189 | { |
| 190 | return copy_to_user(uset, set, sizeof(*uset)); |
| 191 | } |
| 192 | |
Paul Mackerras | 9b7cf8b | 2005-10-19 23:13:04 +1000 | [diff] [blame] | 193 | 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] | 194 | { |
| 195 | return copy_from_user(set, uset, sizeof(*uset)); |
| 196 | } |
| 197 | |
| 198 | static inline int get_old_sigaction(struct k_sigaction *new_ka, |
| 199 | struct old_sigaction __user *act) |
| 200 | { |
| 201 | old_sigset_t mask; |
| 202 | |
| 203 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || |
| 204 | __get_user(new_ka->sa.sa_handler, &act->sa_handler) || |
| 205 | __get_user(new_ka->sa.sa_restorer, &act->sa_restorer)) |
| 206 | return -EFAULT; |
| 207 | __get_user(new_ka->sa.sa_flags, &act->sa_flags); |
| 208 | __get_user(mask, &act->sa_mask); |
| 209 | siginitset(&new_ka->sa.sa_mask, mask); |
| 210 | return 0; |
| 211 | } |
| 212 | |
Al Viro | 29e646df | 2006-02-01 05:28:09 -0500 | [diff] [blame] | 213 | #define to_user_ptr(p) ((unsigned long)(p)) |
| 214 | #define from_user_ptr(p) ((void __user *)(p)) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 215 | |
| 216 | static inline int save_general_regs(struct pt_regs *regs, |
| 217 | struct mcontext __user *frame) |
| 218 | { |
Paul Mackerras | 1bd7933 | 2006-03-08 13:24:22 +1100 | [diff] [blame] | 219 | WARN_ON(!FULL_REGS(regs)); |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 220 | return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE); |
| 221 | } |
| 222 | |
| 223 | static inline int restore_general_regs(struct pt_regs *regs, |
| 224 | struct mcontext __user *sr) |
| 225 | { |
| 226 | /* copy up to but not including MSR */ |
| 227 | if (__copy_from_user(regs, &sr->mc_gregs, |
| 228 | PT_MSR * sizeof(elf_greg_t))) |
| 229 | return -EFAULT; |
| 230 | /* copy from orig_r3 (the word after the MSR) up to the end */ |
| 231 | if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3], |
| 232 | GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t))) |
| 233 | return -EFAULT; |
| 234 | return 0; |
| 235 | } |
| 236 | |
| 237 | #endif /* CONFIG_PPC64 */ |
| 238 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 239 | /* |
| 240 | * Atomically swap in the new signal mask, and wait for a signal. |
| 241 | */ |
David Woodhouse | 150256d | 2006-01-18 17:43:57 -0800 | [diff] [blame] | 242 | long sys_sigsuspend(old_sigset_t mask) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 243 | { |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 244 | mask &= _BLOCKABLE; |
| 245 | spin_lock_irq(¤t->sighand->siglock); |
Heiko Carstens | 4a41cdf | 2006-02-01 03:05:58 -0800 | [diff] [blame] | 246 | current->saved_sigmask = current->blocked; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 247 | siginitset(¤t->blocked, mask); |
| 248 | recalc_sigpending(); |
| 249 | spin_unlock_irq(¤t->sighand->siglock); |
| 250 | |
David Woodhouse | 150256d | 2006-01-18 17:43:57 -0800 | [diff] [blame] | 251 | current->state = TASK_INTERRUPTIBLE; |
| 252 | schedule(); |
Roland McGrath | 7a10174 | 2008-04-28 17:30:37 +1000 | [diff] [blame] | 253 | set_restore_sigmask(); |
David Woodhouse | 150256d | 2006-01-18 17:43:57 -0800 | [diff] [blame] | 254 | return -ERESTARTNOHAND; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 255 | } |
| 256 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 257 | long sys_sigaction(int sig, struct old_sigaction __user *act, |
| 258 | struct old_sigaction __user *oact) |
| 259 | { |
| 260 | struct k_sigaction new_ka, old_ka; |
| 261 | int ret; |
| 262 | |
| 263 | #ifdef CONFIG_PPC64 |
| 264 | if (sig < 0) |
| 265 | sig = -sig; |
| 266 | #endif |
| 267 | |
| 268 | if (act) { |
| 269 | if (get_old_sigaction(&new_ka, act)) |
| 270 | return -EFAULT; |
| 271 | } |
| 272 | |
| 273 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 274 | if (!ret && oact) { |
| 275 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || |
| 276 | __put_user(to_user_ptr(old_ka.sa.sa_handler), |
| 277 | &oact->sa_handler) || |
| 278 | __put_user(to_user_ptr(old_ka.sa.sa_restorer), |
| 279 | &oact->sa_restorer) || |
| 280 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || |
| 281 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) |
| 282 | return -EFAULT; |
| 283 | } |
| 284 | |
| 285 | return ret; |
| 286 | } |
| 287 | |
| 288 | /* |
| 289 | * When we have signals to deliver, we set up on the |
| 290 | * user stack, going down from the original stack pointer: |
Benjamin Herrenschmidt | a3f61dc | 2007-06-04 17:22:48 +1000 | [diff] [blame] | 291 | * an ABI gap of 56 words |
| 292 | * an mcontext struct |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 293 | * a sigcontext struct |
| 294 | * a gap of __SIGNAL_FRAMESIZE bytes |
| 295 | * |
Benjamin Herrenschmidt | a3f61dc | 2007-06-04 17:22:48 +1000 | [diff] [blame] | 296 | * Each of these things must be a multiple of 16 bytes in size. The following |
| 297 | * structure represent all of this except the __SIGNAL_FRAMESIZE gap |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 298 | * |
| 299 | */ |
Benjamin Herrenschmidt | a3f61dc | 2007-06-04 17:22:48 +1000 | [diff] [blame] | 300 | struct sigframe { |
| 301 | struct sigcontext sctx; /* the sigcontext */ |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 302 | struct mcontext mctx; /* all the register values */ |
| 303 | /* |
| 304 | * Programs using the rs6000/xcoff abi can save up to 19 gp |
| 305 | * regs and 18 fp regs below sp before decrementing it. |
| 306 | */ |
| 307 | int abigap[56]; |
| 308 | }; |
| 309 | |
| 310 | /* We use the mc_pad field for the signal return trampoline. */ |
| 311 | #define tramp mc_pad |
| 312 | |
| 313 | /* |
| 314 | * When we have rt signals to deliver, we set up on the |
| 315 | * user stack, going down from the original stack pointer: |
| 316 | * one rt_sigframe struct (siginfo + ucontext + ABI gap) |
| 317 | * a gap of __SIGNAL_FRAMESIZE+16 bytes |
| 318 | * (the +16 is to get the siginfo and ucontext in the same |
| 319 | * positions as in older kernels). |
| 320 | * |
| 321 | * Each of these things must be a multiple of 16 bytes in size. |
| 322 | * |
| 323 | */ |
| 324 | struct rt_sigframe { |
| 325 | #ifdef CONFIG_PPC64 |
| 326 | compat_siginfo_t info; |
| 327 | #else |
| 328 | struct siginfo info; |
| 329 | #endif |
| 330 | struct ucontext uc; |
| 331 | /* |
| 332 | * Programs using the rs6000/xcoff abi can save up to 19 gp |
| 333 | * regs and 18 fp regs below sp before decrementing it. |
| 334 | */ |
| 335 | int abigap[56]; |
| 336 | }; |
| 337 | |
Michael Neuling | 6a274c08 | 2008-07-02 14:06:37 +1000 | [diff] [blame] | 338 | #ifdef CONFIG_VSX |
| 339 | unsigned long copy_fpr_to_user(void __user *to, |
| 340 | struct task_struct *task) |
| 341 | { |
| 342 | double buf[ELF_NFPREG]; |
| 343 | int i; |
| 344 | |
| 345 | /* save FPR copy to local buffer then write to the thread_struct */ |
| 346 | for (i = 0; i < (ELF_NFPREG - 1) ; i++) |
| 347 | buf[i] = task->thread.TS_FPR(i); |
| 348 | memcpy(&buf[i], &task->thread.fpscr, sizeof(double)); |
| 349 | return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double)); |
| 350 | } |
| 351 | |
| 352 | unsigned long copy_fpr_from_user(struct task_struct *task, |
| 353 | void __user *from) |
| 354 | { |
| 355 | double buf[ELF_NFPREG]; |
| 356 | int i; |
| 357 | |
| 358 | if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double))) |
| 359 | return 1; |
| 360 | for (i = 0; i < (ELF_NFPREG - 1) ; i++) |
| 361 | task->thread.TS_FPR(i) = buf[i]; |
| 362 | memcpy(&task->thread.fpscr, &buf[i], sizeof(double)); |
| 363 | |
| 364 | return 0; |
| 365 | } |
| 366 | |
| 367 | unsigned long copy_vsx_to_user(void __user *to, |
| 368 | struct task_struct *task) |
| 369 | { |
| 370 | double buf[ELF_NVSRHALFREG]; |
| 371 | int i; |
| 372 | |
| 373 | /* save FPR copy to local buffer then write to the thread_struct */ |
| 374 | for (i = 0; i < ELF_NVSRHALFREG; i++) |
| 375 | buf[i] = task->thread.fpr[i][TS_VSRLOWOFFSET]; |
| 376 | return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double)); |
| 377 | } |
| 378 | |
| 379 | unsigned long copy_vsx_from_user(struct task_struct *task, |
| 380 | void __user *from) |
| 381 | { |
| 382 | double buf[ELF_NVSRHALFREG]; |
| 383 | int i; |
| 384 | |
| 385 | if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double))) |
| 386 | return 1; |
| 387 | for (i = 0; i < ELF_NVSRHALFREG ; i++) |
| 388 | task->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i]; |
| 389 | return 0; |
| 390 | } |
| 391 | #else |
| 392 | inline unsigned long copy_fpr_to_user(void __user *to, |
| 393 | struct task_struct *task) |
| 394 | { |
| 395 | return __copy_to_user(to, task->thread.fpr, |
| 396 | ELF_NFPREG * sizeof(double)); |
| 397 | } |
| 398 | |
| 399 | inline unsigned long copy_fpr_from_user(struct task_struct *task, |
| 400 | void __user *from) |
| 401 | { |
| 402 | return __copy_from_user(task->thread.fpr, from, |
| 403 | ELF_NFPREG * sizeof(double)); |
| 404 | } |
| 405 | #endif |
| 406 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 407 | /* |
| 408 | * Save the current user registers on the user stack. |
| 409 | * We only save the altivec/spe registers if the process has used |
| 410 | * altivec/spe instructions at some point. |
| 411 | */ |
| 412 | static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame, |
Michael Neuling | 16c29d1 | 2008-10-23 00:42:36 +0000 | [diff] [blame] | 413 | int sigret, int ctx_has_vsx_region) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 414 | { |
Michael Neuling | 9e75118 | 2008-06-25 14:07:17 +1000 | [diff] [blame] | 415 | unsigned long msr = regs->msr; |
| 416 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 417 | /* Make sure floating point registers are stored in regs */ |
| 418 | flush_fp_to_thread(current); |
| 419 | |
Michael Neuling | c6e6771 | 2008-06-25 14:07:18 +1000 | [diff] [blame] | 420 | /* save general registers */ |
| 421 | if (save_general_regs(regs, frame)) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 422 | return 1; |
| 423 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 424 | #ifdef CONFIG_ALTIVEC |
| 425 | /* save altivec registers */ |
| 426 | if (current->thread.used_vr) { |
| 427 | flush_altivec_to_thread(current); |
| 428 | if (__copy_to_user(&frame->mc_vregs, current->thread.vr, |
| 429 | ELF_NVRREG * sizeof(vector128))) |
| 430 | return 1; |
| 431 | /* set MSR_VEC in the saved MSR value to indicate that |
| 432 | frame->mc_vregs contains valid data */ |
Michael Neuling | 9e75118 | 2008-06-25 14:07:17 +1000 | [diff] [blame] | 433 | msr |= MSR_VEC; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 434 | } |
| 435 | /* else assert((regs->msr & MSR_VEC) == 0) */ |
| 436 | |
| 437 | /* We always copy to/from vrsave, it's 0 if we don't have or don't |
| 438 | * use altivec. Since VSCR only contains 32 bits saved in the least |
| 439 | * significant bits of a vector, we "cheat" and stuff VRSAVE in the |
| 440 | * most significant bits of that same vector. --BenH |
| 441 | */ |
| 442 | if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32])) |
| 443 | return 1; |
| 444 | #endif /* CONFIG_ALTIVEC */ |
Michael Neuling | 6a274c08 | 2008-07-02 14:06:37 +1000 | [diff] [blame] | 445 | if (copy_fpr_to_user(&frame->mc_fregs, current)) |
Michael Neuling | c6e6771 | 2008-06-25 14:07:18 +1000 | [diff] [blame] | 446 | return 1; |
Michael Neuling | 6a274c08 | 2008-07-02 14:06:37 +1000 | [diff] [blame] | 447 | #ifdef CONFIG_VSX |
Michael Neuling | ce48b21 | 2008-06-25 14:07:18 +1000 | [diff] [blame] | 448 | /* |
| 449 | * Copy VSR 0-31 upper half from thread_struct to local |
| 450 | * buffer, then write that to userspace. Also set MSR_VSX in |
| 451 | * the saved MSR value to indicate that frame->mc_vregs |
| 452 | * contains valid data |
| 453 | */ |
Michael Neuling | 16c29d1 | 2008-10-23 00:42:36 +0000 | [diff] [blame] | 454 | if (current->thread.used_vsr && ctx_has_vsx_region) { |
Michael Neuling | 7c29217 | 2008-07-11 16:29:12 +1000 | [diff] [blame] | 455 | __giveup_vsx(current); |
Michael Neuling | 6a274c08 | 2008-07-02 14:06:37 +1000 | [diff] [blame] | 456 | if (copy_vsx_to_user(&frame->mc_vsregs, current)) |
Michael Neuling | ce48b21 | 2008-06-25 14:07:18 +1000 | [diff] [blame] | 457 | return 1; |
| 458 | msr |= MSR_VSX; |
| 459 | } |
Michael Neuling | c6e6771 | 2008-06-25 14:07:18 +1000 | [diff] [blame] | 460 | #endif /* CONFIG_VSX */ |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 461 | #ifdef CONFIG_SPE |
| 462 | /* save spe registers */ |
| 463 | if (current->thread.used_spe) { |
| 464 | flush_spe_to_thread(current); |
| 465 | if (__copy_to_user(&frame->mc_vregs, current->thread.evr, |
| 466 | ELF_NEVRREG * sizeof(u32))) |
| 467 | return 1; |
| 468 | /* set MSR_SPE in the saved MSR value to indicate that |
| 469 | frame->mc_vregs contains valid data */ |
Michael Neuling | 9e75118 | 2008-06-25 14:07:17 +1000 | [diff] [blame] | 470 | msr |= MSR_SPE; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 471 | } |
| 472 | /* else assert((regs->msr & MSR_SPE) == 0) */ |
| 473 | |
| 474 | /* We always copy to/from spefscr */ |
| 475 | if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG)) |
| 476 | return 1; |
| 477 | #endif /* CONFIG_SPE */ |
| 478 | |
Michael Neuling | 9e75118 | 2008-06-25 14:07:17 +1000 | [diff] [blame] | 479 | if (__put_user(msr, &frame->mc_gregs[PT_MSR])) |
| 480 | return 1; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 481 | if (sigret) { |
| 482 | /* Set up the sigreturn trampoline: li r0,sigret; sc */ |
| 483 | if (__put_user(0x38000000UL + sigret, &frame->tramp[0]) |
| 484 | || __put_user(0x44000002UL, &frame->tramp[1])) |
| 485 | return 1; |
| 486 | flush_icache_range((unsigned long) &frame->tramp[0], |
| 487 | (unsigned long) &frame->tramp[2]); |
| 488 | } |
| 489 | |
| 490 | return 0; |
| 491 | } |
| 492 | |
| 493 | /* |
| 494 | * Restore the current user register values from the user stack, |
| 495 | * (except for MSR). |
| 496 | */ |
| 497 | static long restore_user_regs(struct pt_regs *regs, |
| 498 | struct mcontext __user *sr, int sig) |
| 499 | { |
| 500 | long err; |
| 501 | unsigned int save_r2 = 0; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 502 | unsigned long msr; |
Michael Neuling | c6e6771 | 2008-06-25 14:07:18 +1000 | [diff] [blame] | 503 | #ifdef CONFIG_VSX |
Michael Neuling | c6e6771 | 2008-06-25 14:07:18 +1000 | [diff] [blame] | 504 | int i; |
| 505 | #endif |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 506 | |
| 507 | /* |
| 508 | * restore general registers but not including MSR or SOFTE. Also |
| 509 | * take care of keeping r2 (TLS) intact if not a signal |
| 510 | */ |
| 511 | if (!sig) |
| 512 | save_r2 = (unsigned int)regs->gpr[2]; |
| 513 | err = restore_general_regs(regs, sr); |
Al Viro | 9a81c16 | 2010-09-20 21:48:57 +0100 | [diff] [blame] | 514 | regs->trap = 0; |
Paul Mackerras | fab5db9 | 2006-06-07 16:14:40 +1000 | [diff] [blame] | 515 | err |= __get_user(msr, &sr->mc_gregs[PT_MSR]); |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 516 | if (!sig) |
| 517 | regs->gpr[2] = (unsigned long) save_r2; |
| 518 | if (err) |
| 519 | return 1; |
| 520 | |
Paul Mackerras | fab5db9 | 2006-06-07 16:14:40 +1000 | [diff] [blame] | 521 | /* if doing signal return, restore the previous little-endian mode */ |
| 522 | if (sig) |
| 523 | regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE); |
| 524 | |
Paul Mackerras | 5388fb1 | 2006-01-11 22:11:39 +1100 | [diff] [blame] | 525 | /* |
| 526 | * Do this before updating the thread state in |
| 527 | * current->thread.fpr/vr/evr. That way, if we get preempted |
| 528 | * and another task grabs the FPU/Altivec/SPE, it won't be |
| 529 | * tempted to save the current CPU state into the thread_struct |
| 530 | * and corrupt what we are writing there. |
| 531 | */ |
| 532 | discard_lazy_cpu_state(); |
| 533 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 534 | #ifdef CONFIG_ALTIVEC |
Michael Neuling | c6e6771 | 2008-06-25 14:07:18 +1000 | [diff] [blame] | 535 | /* |
| 536 | * Force the process to reload the altivec registers from |
| 537 | * current->thread when it next does altivec instructions |
| 538 | */ |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 539 | regs->msr &= ~MSR_VEC; |
Paul Mackerras | fab5db9 | 2006-06-07 16:14:40 +1000 | [diff] [blame] | 540 | if (msr & MSR_VEC) { |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 541 | /* restore altivec registers from the stack */ |
| 542 | if (__copy_from_user(current->thread.vr, &sr->mc_vregs, |
| 543 | sizeof(sr->mc_vregs))) |
| 544 | return 1; |
| 545 | } else if (current->thread.used_vr) |
| 546 | memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128)); |
| 547 | |
| 548 | /* Always get VRSAVE back */ |
| 549 | if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32])) |
| 550 | return 1; |
| 551 | #endif /* CONFIG_ALTIVEC */ |
Michael Neuling | 6a274c08 | 2008-07-02 14:06:37 +1000 | [diff] [blame] | 552 | if (copy_fpr_from_user(current, &sr->mc_fregs)) |
| 553 | return 1; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 554 | |
Michael Neuling | c6e6771 | 2008-06-25 14:07:18 +1000 | [diff] [blame] | 555 | #ifdef CONFIG_VSX |
Michael Neuling | ce48b21 | 2008-06-25 14:07:18 +1000 | [diff] [blame] | 556 | /* |
| 557 | * Force the process to reload the VSX registers from |
| 558 | * current->thread when it next does VSX instruction. |
| 559 | */ |
| 560 | regs->msr &= ~MSR_VSX; |
| 561 | if (msr & MSR_VSX) { |
| 562 | /* |
| 563 | * Restore altivec registers from the stack to a local |
| 564 | * buffer, then write this out to the thread_struct |
| 565 | */ |
Michael Neuling | 6a274c08 | 2008-07-02 14:06:37 +1000 | [diff] [blame] | 566 | if (copy_vsx_from_user(current, &sr->mc_vsregs)) |
Michael Neuling | ce48b21 | 2008-06-25 14:07:18 +1000 | [diff] [blame] | 567 | return 1; |
Michael Neuling | ce48b21 | 2008-06-25 14:07:18 +1000 | [diff] [blame] | 568 | } else if (current->thread.used_vsr) |
| 569 | for (i = 0; i < 32 ; i++) |
| 570 | current->thread.fpr[i][TS_VSRLOWOFFSET] = 0; |
Michael Neuling | c6e6771 | 2008-06-25 14:07:18 +1000 | [diff] [blame] | 571 | #endif /* CONFIG_VSX */ |
| 572 | /* |
| 573 | * force the process to reload the FP registers from |
| 574 | * current->thread when it next does FP instructions |
| 575 | */ |
| 576 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1); |
| 577 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 578 | #ifdef CONFIG_SPE |
| 579 | /* force the process to reload the spe registers from |
| 580 | current->thread when it next does spe instructions */ |
| 581 | regs->msr &= ~MSR_SPE; |
Paul Mackerras | fab5db9 | 2006-06-07 16:14:40 +1000 | [diff] [blame] | 582 | if (msr & MSR_SPE) { |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 583 | /* restore spe registers from the stack */ |
| 584 | if (__copy_from_user(current->thread.evr, &sr->mc_vregs, |
| 585 | ELF_NEVRREG * sizeof(u32))) |
| 586 | return 1; |
| 587 | } else if (current->thread.used_spe) |
| 588 | memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32)); |
| 589 | |
| 590 | /* Always get SPEFSCR back */ |
| 591 | if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG)) |
| 592 | return 1; |
| 593 | #endif /* CONFIG_SPE */ |
| 594 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 595 | return 0; |
| 596 | } |
| 597 | |
| 598 | #ifdef CONFIG_PPC64 |
Stephen Rothwell | b09a491 | 2005-10-18 14:51:57 +1000 | [diff] [blame] | 599 | long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act, |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 600 | struct sigaction32 __user *oact, size_t sigsetsize) |
| 601 | { |
| 602 | struct k_sigaction new_ka, old_ka; |
| 603 | int ret; |
| 604 | |
| 605 | /* XXX: Don't preclude handling different sized sigset_t's. */ |
| 606 | if (sigsetsize != sizeof(compat_sigset_t)) |
| 607 | return -EINVAL; |
| 608 | |
| 609 | if (act) { |
| 610 | compat_uptr_t handler; |
| 611 | |
| 612 | ret = get_user(handler, &act->sa_handler); |
| 613 | new_ka.sa.sa_handler = compat_ptr(handler); |
| 614 | ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask); |
| 615 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
| 616 | if (ret) |
| 617 | return -EFAULT; |
| 618 | } |
| 619 | |
| 620 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 621 | if (!ret && oact) { |
Al Viro | 29e646df | 2006-02-01 05:28:09 -0500 | [diff] [blame] | 622 | 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] | 623 | ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask); |
| 624 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
| 625 | } |
| 626 | return ret; |
| 627 | } |
| 628 | |
| 629 | /* |
| 630 | * Note: it is necessary to treat how as an unsigned int, with the |
| 631 | * corresponding cast to a signed int to insure that the proper |
| 632 | * conversion (sign extension) between the register representation |
| 633 | * of a signed int (msr in 32-bit mode) and the register representation |
| 634 | * of a signed int (msr in 64-bit mode) is performed. |
| 635 | */ |
Stephen Rothwell | b09a491 | 2005-10-18 14:51:57 +1000 | [diff] [blame] | 636 | long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set, |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 637 | compat_sigset_t __user *oset, size_t sigsetsize) |
| 638 | { |
| 639 | sigset_t s; |
| 640 | sigset_t __user *up; |
| 641 | int ret; |
| 642 | mm_segment_t old_fs = get_fs(); |
| 643 | |
| 644 | if (set) { |
| 645 | if (get_sigset_t(&s, set)) |
| 646 | return -EFAULT; |
| 647 | } |
| 648 | |
| 649 | set_fs(KERNEL_DS); |
| 650 | /* This is valid because of the set_fs() */ |
| 651 | up = (sigset_t __user *) &s; |
| 652 | ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL, |
| 653 | sigsetsize); |
| 654 | set_fs(old_fs); |
| 655 | if (ret) |
| 656 | return ret; |
| 657 | if (oset) { |
| 658 | if (put_sigset_t(oset, &s)) |
| 659 | return -EFAULT; |
| 660 | } |
| 661 | return 0; |
| 662 | } |
| 663 | |
Stephen Rothwell | b09a491 | 2005-10-18 14:51:57 +1000 | [diff] [blame] | 664 | 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] | 665 | { |
| 666 | sigset_t s; |
| 667 | int ret; |
| 668 | mm_segment_t old_fs = get_fs(); |
| 669 | |
| 670 | set_fs(KERNEL_DS); |
| 671 | /* The __user pointer cast is valid because of the set_fs() */ |
| 672 | ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); |
| 673 | set_fs(old_fs); |
| 674 | if (!ret) { |
| 675 | if (put_sigset_t(set, &s)) |
| 676 | return -EFAULT; |
| 677 | } |
| 678 | return ret; |
| 679 | } |
| 680 | |
| 681 | |
| 682 | int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s) |
| 683 | { |
| 684 | int err; |
| 685 | |
| 686 | if (!access_ok (VERIFY_WRITE, d, sizeof(*d))) |
| 687 | return -EFAULT; |
| 688 | |
| 689 | /* If you change siginfo_t structure, please be sure |
| 690 | * this code is fixed accordingly. |
| 691 | * It should never copy any pad contained in the structure |
| 692 | * to avoid security leaks, but must copy the generic |
| 693 | * 3 ints plus the relevant union member. |
| 694 | * This routine must convert siginfo from 64bit to 32bit as well |
| 695 | * at the same time. |
| 696 | */ |
| 697 | err = __put_user(s->si_signo, &d->si_signo); |
| 698 | err |= __put_user(s->si_errno, &d->si_errno); |
| 699 | err |= __put_user((short)s->si_code, &d->si_code); |
| 700 | if (s->si_code < 0) |
| 701 | err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad, |
| 702 | SI_PAD_SIZE32); |
| 703 | else switch(s->si_code >> 16) { |
| 704 | case __SI_CHLD >> 16: |
| 705 | err |= __put_user(s->si_pid, &d->si_pid); |
| 706 | err |= __put_user(s->si_uid, &d->si_uid); |
| 707 | err |= __put_user(s->si_utime, &d->si_utime); |
| 708 | err |= __put_user(s->si_stime, &d->si_stime); |
| 709 | err |= __put_user(s->si_status, &d->si_status); |
| 710 | break; |
| 711 | case __SI_FAULT >> 16: |
| 712 | err |= __put_user((unsigned int)(unsigned long)s->si_addr, |
| 713 | &d->si_addr); |
| 714 | break; |
| 715 | case __SI_POLL >> 16: |
| 716 | err |= __put_user(s->si_band, &d->si_band); |
| 717 | err |= __put_user(s->si_fd, &d->si_fd); |
| 718 | break; |
| 719 | case __SI_TIMER >> 16: |
| 720 | err |= __put_user(s->si_tid, &d->si_tid); |
| 721 | err |= __put_user(s->si_overrun, &d->si_overrun); |
| 722 | err |= __put_user(s->si_int, &d->si_int); |
| 723 | break; |
| 724 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ |
| 725 | case __SI_MESGQ >> 16: |
| 726 | err |= __put_user(s->si_int, &d->si_int); |
| 727 | /* fallthrough */ |
| 728 | case __SI_KILL >> 16: |
| 729 | default: |
| 730 | err |= __put_user(s->si_pid, &d->si_pid); |
| 731 | err |= __put_user(s->si_uid, &d->si_uid); |
| 732 | break; |
| 733 | } |
| 734 | return err; |
| 735 | } |
| 736 | |
| 737 | #define copy_siginfo_to_user copy_siginfo_to_user32 |
| 738 | |
Roland McGrath | 9c0c44d | 2008-04-20 08:19:24 +1000 | [diff] [blame] | 739 | int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from) |
| 740 | { |
| 741 | memset(to, 0, sizeof *to); |
| 742 | |
| 743 | if (copy_from_user(to, from, 3*sizeof(int)) || |
| 744 | copy_from_user(to->_sifields._pad, |
| 745 | from->_sifields._pad, SI_PAD_SIZE32)) |
| 746 | return -EFAULT; |
| 747 | |
| 748 | return 0; |
| 749 | } |
| 750 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 751 | /* |
| 752 | * Note: it is necessary to treat pid and sig as unsigned ints, with the |
| 753 | * corresponding cast to a signed int to insure that the proper conversion |
| 754 | * (sign extension) between the register representation of a signed int |
| 755 | * (msr in 32-bit mode) and the register representation of a signed int |
| 756 | * (msr in 64-bit mode) is performed. |
| 757 | */ |
Stephen Rothwell | b09a491 | 2005-10-18 14:51:57 +1000 | [diff] [blame] | 758 | 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] | 759 | { |
| 760 | siginfo_t info; |
| 761 | int ret; |
| 762 | mm_segment_t old_fs = get_fs(); |
| 763 | |
Roland McGrath | 9c0c44d | 2008-04-20 08:19:24 +1000 | [diff] [blame] | 764 | ret = copy_siginfo_from_user32(&info, uinfo); |
| 765 | if (unlikely(ret)) |
| 766 | return ret; |
| 767 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 768 | set_fs (KERNEL_DS); |
| 769 | /* The __user pointer cast is valid becasuse of the set_fs() */ |
| 770 | ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info); |
| 771 | set_fs (old_fs); |
| 772 | return ret; |
| 773 | } |
| 774 | /* |
| 775 | * Start Alternate signal stack support |
| 776 | * |
| 777 | * System Calls |
Stephen Rothwell | b09a491 | 2005-10-18 14:51:57 +1000 | [diff] [blame] | 778 | * sigaltatck compat_sys_sigaltstack |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 779 | */ |
| 780 | |
Stephen Rothwell | b09a491 | 2005-10-18 14:51:57 +1000 | [diff] [blame] | 781 | int compat_sys_sigaltstack(u32 __new, u32 __old, int r5, |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 782 | int r6, int r7, int r8, struct pt_regs *regs) |
| 783 | { |
Al Viro | 29e646df | 2006-02-01 05:28:09 -0500 | [diff] [blame] | 784 | stack_32_t __user * newstack = compat_ptr(__new); |
| 785 | stack_32_t __user * oldstack = compat_ptr(__old); |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 786 | stack_t uss, uoss; |
| 787 | int ret; |
| 788 | mm_segment_t old_fs; |
| 789 | unsigned long sp; |
| 790 | compat_uptr_t ss_sp; |
| 791 | |
| 792 | /* |
| 793 | * set sp to the user stack on entry to the system call |
| 794 | * the system call router sets R9 to the saved registers |
| 795 | */ |
| 796 | sp = regs->gpr[1]; |
| 797 | |
| 798 | /* Put new stack info in local 64 bit stack struct */ |
| 799 | if (newstack) { |
| 800 | if (get_user(ss_sp, &newstack->ss_sp) || |
| 801 | __get_user(uss.ss_flags, &newstack->ss_flags) || |
| 802 | __get_user(uss.ss_size, &newstack->ss_size)) |
| 803 | return -EFAULT; |
| 804 | uss.ss_sp = compat_ptr(ss_sp); |
| 805 | } |
| 806 | |
| 807 | old_fs = get_fs(); |
| 808 | set_fs(KERNEL_DS); |
| 809 | /* The __user pointer casts are valid because of the set_fs() */ |
| 810 | ret = do_sigaltstack( |
| 811 | newstack ? (stack_t __user *) &uss : NULL, |
| 812 | oldstack ? (stack_t __user *) &uoss : NULL, |
| 813 | sp); |
| 814 | set_fs(old_fs); |
| 815 | /* Copy the stack information to the user output buffer */ |
| 816 | if (!ret && oldstack && |
Al Viro | 29e646df | 2006-02-01 05:28:09 -0500 | [diff] [blame] | 817 | (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) || |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 818 | __put_user(uoss.ss_flags, &oldstack->ss_flags) || |
| 819 | __put_user(uoss.ss_size, &oldstack->ss_size))) |
| 820 | return -EFAULT; |
| 821 | return ret; |
| 822 | } |
| 823 | #endif /* CONFIG_PPC64 */ |
| 824 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 825 | /* |
| 826 | * Set up a signal frame for a "real-time" signal handler |
| 827 | * (one which gets siginfo). |
| 828 | */ |
Christoph Hellwig | f478f54 | 2007-06-04 15:15:52 +1000 | [diff] [blame] | 829 | int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka, |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 830 | siginfo_t *info, sigset_t *oldset, |
Benjamin Herrenschmidt | a3f61dc | 2007-06-04 17:22:48 +1000 | [diff] [blame] | 831 | struct pt_regs *regs) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 832 | { |
| 833 | struct rt_sigframe __user *rt_sf; |
| 834 | struct mcontext __user *frame; |
Olof Johansson | d0c3d53 | 2007-10-12 10:20:07 +1000 | [diff] [blame] | 835 | void __user *addr; |
Benjamin Herrenschmidt | a3f61dc | 2007-06-04 17:22:48 +1000 | [diff] [blame] | 836 | unsigned long newsp = 0; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 837 | |
| 838 | /* Set up Signal Frame */ |
| 839 | /* Put a Real Time Context onto stack */ |
Josh Boyer | efbda86 | 2009-03-25 06:23:59 +0000 | [diff] [blame] | 840 | rt_sf = get_sigframe(ka, regs, sizeof(*rt_sf), 1); |
Olof Johansson | d0c3d53 | 2007-10-12 10:20:07 +1000 | [diff] [blame] | 841 | addr = rt_sf; |
Benjamin Herrenschmidt | a3f61dc | 2007-06-04 17:22:48 +1000 | [diff] [blame] | 842 | if (unlikely(rt_sf == NULL)) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 843 | goto badframe; |
| 844 | |
| 845 | /* Put the siginfo & fill in most of the ucontext */ |
| 846 | if (copy_siginfo_to_user(&rt_sf->info, info) |
| 847 | || __put_user(0, &rt_sf->uc.uc_flags) |
| 848 | || __put_user(0, &rt_sf->uc.uc_link) |
| 849 | || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp) |
| 850 | || __put_user(sas_ss_flags(regs->gpr[1]), |
| 851 | &rt_sf->uc.uc_stack.ss_flags) |
| 852 | || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size) |
| 853 | || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext), |
| 854 | &rt_sf->uc.uc_regs) |
| 855 | || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset)) |
| 856 | goto badframe; |
| 857 | |
| 858 | /* Save user registers on the stack */ |
| 859 | frame = &rt_sf->uc.uc_mcontext; |
Olof Johansson | d0c3d53 | 2007-10-12 10:20:07 +1000 | [diff] [blame] | 860 | addr = frame; |
Benjamin Herrenschmidt | a5bba93 | 2006-05-30 13:51:37 +1000 | [diff] [blame] | 861 | if (vdso32_rt_sigtramp && current->mm->context.vdso_base) { |
Michael Neuling | 16c29d1 | 2008-10-23 00:42:36 +0000 | [diff] [blame] | 862 | if (save_user_regs(regs, frame, 0, 1)) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 863 | goto badframe; |
Benjamin Herrenschmidt | a5bba93 | 2006-05-30 13:51:37 +1000 | [diff] [blame] | 864 | regs->link = current->mm->context.vdso_base + vdso32_rt_sigtramp; |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 865 | } else { |
Michael Neuling | 16c29d1 | 2008-10-23 00:42:36 +0000 | [diff] [blame] | 866 | if (save_user_regs(regs, frame, __NR_rt_sigreturn, 1)) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 867 | goto badframe; |
| 868 | regs->link = (unsigned long) frame->tramp; |
| 869 | } |
Paul Mackerras | cc657f5 | 2005-11-14 21:55:15 +1100 | [diff] [blame] | 870 | |
| 871 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ |
| 872 | |
Benjamin Herrenschmidt | a3f61dc | 2007-06-04 17:22:48 +1000 | [diff] [blame] | 873 | /* create a stack frame for the caller of the handler */ |
| 874 | newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16); |
Olof Johansson | d0c3d53 | 2007-10-12 10:20:07 +1000 | [diff] [blame] | 875 | addr = (void __user *)regs->gpr[1]; |
Paul Mackerras | e2b5530 | 2005-10-22 14:46:33 +1000 | [diff] [blame] | 876 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 877 | goto badframe; |
Benjamin Herrenschmidt | a3f61dc | 2007-06-04 17:22:48 +1000 | [diff] [blame] | 878 | |
| 879 | /* Fill registers for signal handler */ |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 880 | regs->gpr[1] = newsp; |
| 881 | regs->gpr[3] = sig; |
| 882 | regs->gpr[4] = (unsigned long) &rt_sf->info; |
| 883 | regs->gpr[5] = (unsigned long) &rt_sf->uc; |
| 884 | regs->gpr[6] = (unsigned long) rt_sf; |
| 885 | regs->nip = (unsigned long) ka->sa.sa_handler; |
Paul Mackerras | fab5db9 | 2006-06-07 16:14:40 +1000 | [diff] [blame] | 886 | /* enter the signal handler in big-endian mode */ |
| 887 | regs->msr &= ~MSR_LE; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 888 | return 1; |
| 889 | |
| 890 | badframe: |
| 891 | #ifdef DEBUG_SIG |
| 892 | printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n", |
| 893 | regs, frame, newsp); |
| 894 | #endif |
Olof Johansson | d0c3d53 | 2007-10-12 10:20:07 +1000 | [diff] [blame] | 895 | if (show_unhandled_signals && printk_ratelimit()) |
| 896 | printk(KERN_INFO "%s[%d]: bad frame in handle_rt_signal32: " |
| 897 | "%p nip %08lx lr %08lx\n", |
| 898 | current->comm, current->pid, |
| 899 | addr, regs->nip, regs->link); |
| 900 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 901 | force_sigsegv(sig, current); |
| 902 | return 0; |
| 903 | } |
| 904 | |
| 905 | static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig) |
| 906 | { |
| 907 | sigset_t set; |
| 908 | struct mcontext __user *mcp; |
| 909 | |
| 910 | if (get_sigset_t(&set, &ucp->uc_sigmask)) |
| 911 | return -EFAULT; |
| 912 | #ifdef CONFIG_PPC64 |
| 913 | { |
| 914 | u32 cmcp; |
| 915 | |
| 916 | if (__get_user(cmcp, &ucp->uc_regs)) |
| 917 | return -EFAULT; |
| 918 | mcp = (struct mcontext __user *)(u64)cmcp; |
Paul Mackerras | 7c85d1f | 2006-06-09 13:02:59 +1000 | [diff] [blame] | 919 | /* no need to check access_ok(mcp), since mcp < 4GB */ |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 920 | } |
| 921 | #else |
| 922 | if (__get_user(mcp, &ucp->uc_regs)) |
| 923 | return -EFAULT; |
Paul Mackerras | 7c85d1f | 2006-06-09 13:02:59 +1000 | [diff] [blame] | 924 | if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp))) |
| 925 | return -EFAULT; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 926 | #endif |
| 927 | restore_sigmask(&set); |
| 928 | if (restore_user_regs(regs, mcp, sig)) |
| 929 | return -EFAULT; |
| 930 | |
| 931 | return 0; |
| 932 | } |
| 933 | |
| 934 | long sys_swapcontext(struct ucontext __user *old_ctx, |
Paul Mackerras | 1bd7933 | 2006-03-08 13:24:22 +1100 | [diff] [blame] | 935 | struct ucontext __user *new_ctx, |
| 936 | 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] | 937 | { |
| 938 | unsigned char tmp; |
Michael Neuling | 16c29d1 | 2008-10-23 00:42:36 +0000 | [diff] [blame] | 939 | int ctx_has_vsx_region = 0; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 940 | |
Michael Neuling | c1cb299 | 2008-07-08 18:43:41 +1000 | [diff] [blame] | 941 | #ifdef CONFIG_PPC64 |
| 942 | unsigned long new_msr = 0; |
| 943 | |
Andreas Schwab | 77eb50a | 2008-11-06 00:49:00 +0000 | [diff] [blame] | 944 | if (new_ctx) { |
| 945 | struct mcontext __user *mcp; |
| 946 | u32 cmcp; |
| 947 | |
| 948 | /* |
| 949 | * Get pointer to the real mcontext. No need for |
| 950 | * access_ok since we are dealing with compat |
| 951 | * pointers. |
| 952 | */ |
| 953 | if (__get_user(cmcp, &new_ctx->uc_regs)) |
| 954 | return -EFAULT; |
| 955 | mcp = (struct mcontext __user *)(u64)cmcp; |
| 956 | if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR])) |
| 957 | return -EFAULT; |
| 958 | } |
Michael Neuling | c1cb299 | 2008-07-08 18:43:41 +1000 | [diff] [blame] | 959 | /* |
| 960 | * Check that the context is not smaller than the original |
| 961 | * size (with VMX but without VSX) |
| 962 | */ |
| 963 | if (ctx_size < UCONTEXTSIZEWITHOUTVSX) |
| 964 | return -EINVAL; |
| 965 | /* |
| 966 | * If the new context state sets the MSR VSX bits but |
| 967 | * it doesn't provide VSX state. |
| 968 | */ |
| 969 | if ((ctx_size < sizeof(struct ucontext)) && |
| 970 | (new_msr & MSR_VSX)) |
| 971 | return -EINVAL; |
Michael Neuling | 16c29d1 | 2008-10-23 00:42:36 +0000 | [diff] [blame] | 972 | /* Does the context have enough room to store VSX data? */ |
| 973 | if (ctx_size >= sizeof(struct ucontext)) |
| 974 | ctx_has_vsx_region = 1; |
Michael Neuling | c1cb299 | 2008-07-08 18:43:41 +1000 | [diff] [blame] | 975 | #else |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 976 | /* Context size is for future use. Right now, we only make sure |
| 977 | * we are passed something we understand |
| 978 | */ |
| 979 | if (ctx_size < sizeof(struct ucontext)) |
| 980 | return -EINVAL; |
Michael Neuling | c1cb299 | 2008-07-08 18:43:41 +1000 | [diff] [blame] | 981 | #endif |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 982 | if (old_ctx != NULL) { |
Paul Mackerras | 1c9bb1a | 2006-12-20 13:57:06 +1100 | [diff] [blame] | 983 | struct mcontext __user *mctx; |
| 984 | |
| 985 | /* |
| 986 | * old_ctx might not be 16-byte aligned, in which |
| 987 | * case old_ctx->uc_mcontext won't be either. |
| 988 | * Because we have the old_ctx->uc_pad2 field |
| 989 | * before old_ctx->uc_mcontext, we need to round down |
| 990 | * from &old_ctx->uc_mcontext to a 16-byte boundary. |
| 991 | */ |
| 992 | mctx = (struct mcontext __user *) |
| 993 | ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL); |
Michael Neuling | 16c29d1 | 2008-10-23 00:42:36 +0000 | [diff] [blame] | 994 | if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size) |
| 995 | || save_user_regs(regs, mctx, 0, ctx_has_vsx_region) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 996 | || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked) |
Paul Mackerras | 1c9bb1a | 2006-12-20 13:57:06 +1100 | [diff] [blame] | 997 | || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs)) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 998 | return -EFAULT; |
| 999 | } |
| 1000 | if (new_ctx == NULL) |
| 1001 | return 0; |
Michael Neuling | 16c29d1 | 2008-10-23 00:42:36 +0000 | [diff] [blame] | 1002 | if (!access_ok(VERIFY_READ, new_ctx, ctx_size) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1003 | || __get_user(tmp, (u8 __user *) new_ctx) |
Michael Neuling | 16c29d1 | 2008-10-23 00:42:36 +0000 | [diff] [blame] | 1004 | || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1)) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1005 | return -EFAULT; |
| 1006 | |
| 1007 | /* |
| 1008 | * If we get a fault copying the context into the kernel's |
| 1009 | * image of the user's registers, we can't just return -EFAULT |
| 1010 | * because the user's registers will be corrupted. For instance |
| 1011 | * the NIP value may have been updated but not some of the |
| 1012 | * other registers. Given that we have done the access_ok |
| 1013 | * and successfully read the first and last bytes of the region |
| 1014 | * above, this should only happen in an out-of-memory situation |
| 1015 | * or if another thread unmaps the region containing the context. |
| 1016 | * We kill the task with a SIGSEGV in this situation. |
| 1017 | */ |
| 1018 | if (do_setcontext(new_ctx, regs, 0)) |
| 1019 | do_exit(SIGSEGV); |
David Woodhouse | 401d1f0 | 2005-11-15 18:52:18 +0000 | [diff] [blame] | 1020 | |
| 1021 | set_thread_flag(TIF_RESTOREALL); |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1022 | return 0; |
| 1023 | } |
| 1024 | |
| 1025 | long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
| 1026 | struct pt_regs *regs) |
| 1027 | { |
| 1028 | struct rt_sigframe __user *rt_sf; |
| 1029 | |
| 1030 | /* Always make any pending restarted system calls return -EINTR */ |
| 1031 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 1032 | |
| 1033 | rt_sf = (struct rt_sigframe __user *) |
| 1034 | (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16); |
| 1035 | if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf))) |
| 1036 | goto bad; |
| 1037 | if (do_setcontext(&rt_sf->uc, regs, 1)) |
| 1038 | goto bad; |
| 1039 | |
| 1040 | /* |
| 1041 | * It's not clear whether or why it is desirable to save the |
| 1042 | * sigaltstack setting on signal delivery and restore it on |
| 1043 | * signal return. But other architectures do this and we have |
| 1044 | * always done it up until now so it is probably better not to |
| 1045 | * change it. -- paulus |
| 1046 | */ |
| 1047 | #ifdef CONFIG_PPC64 |
| 1048 | /* |
Stephen Rothwell | b09a491 | 2005-10-18 14:51:57 +1000 | [diff] [blame] | 1049 | * 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] | 1050 | * and takes userland pointer directly. What about error checking ? |
| 1051 | * nobody does any... |
| 1052 | */ |
Stephen Rothwell | b09a491 | 2005-10-18 14:51:57 +1000 | [diff] [blame] | 1053 | 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] | 1054 | #else |
| 1055 | do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]); |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1056 | #endif |
David Woodhouse | 401d1f0 | 2005-11-15 18:52:18 +0000 | [diff] [blame] | 1057 | set_thread_flag(TIF_RESTOREALL); |
| 1058 | return 0; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1059 | |
| 1060 | bad: |
Olof Johansson | d0c3d53 | 2007-10-12 10:20:07 +1000 | [diff] [blame] | 1061 | if (show_unhandled_signals && printk_ratelimit()) |
| 1062 | printk(KERN_INFO "%s[%d]: bad frame in sys_rt_sigreturn: " |
| 1063 | "%p nip %08lx lr %08lx\n", |
| 1064 | current->comm, current->pid, |
| 1065 | rt_sf, regs->nip, regs->link); |
| 1066 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1067 | force_sig(SIGSEGV, current); |
| 1068 | return 0; |
| 1069 | } |
| 1070 | |
| 1071 | #ifdef CONFIG_PPC32 |
| 1072 | int sys_debug_setcontext(struct ucontext __user *ctx, |
| 1073 | int ndbg, struct sig_dbg_op __user *dbg, |
| 1074 | int r6, int r7, int r8, |
| 1075 | struct pt_regs *regs) |
| 1076 | { |
| 1077 | struct sig_dbg_op op; |
| 1078 | int i; |
Paul Mackerras | 7c85d1f | 2006-06-09 13:02:59 +1000 | [diff] [blame] | 1079 | unsigned char tmp; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1080 | unsigned long new_msr = regs->msr; |
Dave Kleikamp | 172ae2e | 2010-02-08 11:50:57 +0000 | [diff] [blame] | 1081 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1082 | unsigned long new_dbcr0 = current->thread.dbcr0; |
| 1083 | #endif |
| 1084 | |
| 1085 | for (i=0; i<ndbg; i++) { |
Paul Mackerras | 7c85d1f | 2006-06-09 13:02:59 +1000 | [diff] [blame] | 1086 | if (copy_from_user(&op, dbg + i, sizeof(op))) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1087 | return -EFAULT; |
| 1088 | switch (op.dbg_type) { |
| 1089 | case SIG_DBG_SINGLE_STEPPING: |
Dave Kleikamp | 172ae2e | 2010-02-08 11:50:57 +0000 | [diff] [blame] | 1090 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1091 | if (op.dbg_value) { |
| 1092 | new_msr |= MSR_DE; |
| 1093 | new_dbcr0 |= (DBCR0_IDM | DBCR0_IC); |
| 1094 | } else { |
Dave Kleikamp | 3bffb65 | 2010-02-08 11:51:18 +0000 | [diff] [blame] | 1095 | new_dbcr0 &= ~DBCR0_IC; |
| 1096 | if (!DBCR_ACTIVE_EVENTS(new_dbcr0, |
| 1097 | current->thread.dbcr1)) { |
| 1098 | new_msr &= ~MSR_DE; |
| 1099 | new_dbcr0 &= ~DBCR0_IDM; |
| 1100 | } |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1101 | } |
| 1102 | #else |
| 1103 | if (op.dbg_value) |
| 1104 | new_msr |= MSR_SE; |
| 1105 | else |
| 1106 | new_msr &= ~MSR_SE; |
| 1107 | #endif |
| 1108 | break; |
| 1109 | case SIG_DBG_BRANCH_TRACING: |
Dave Kleikamp | 172ae2e | 2010-02-08 11:50:57 +0000 | [diff] [blame] | 1110 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1111 | return -EINVAL; |
| 1112 | #else |
| 1113 | if (op.dbg_value) |
| 1114 | new_msr |= MSR_BE; |
| 1115 | else |
| 1116 | new_msr &= ~MSR_BE; |
| 1117 | #endif |
| 1118 | break; |
| 1119 | |
| 1120 | default: |
| 1121 | return -EINVAL; |
| 1122 | } |
| 1123 | } |
| 1124 | |
| 1125 | /* We wait until here to actually install the values in the |
| 1126 | registers so if we fail in the above loop, it will not |
| 1127 | affect the contents of these registers. After this point, |
| 1128 | failure is a problem, anyway, and it's very unlikely unless |
| 1129 | the user is really doing something wrong. */ |
| 1130 | regs->msr = new_msr; |
Dave Kleikamp | 172ae2e | 2010-02-08 11:50:57 +0000 | [diff] [blame] | 1131 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1132 | current->thread.dbcr0 = new_dbcr0; |
| 1133 | #endif |
| 1134 | |
Paul Mackerras | 7c85d1f | 2006-06-09 13:02:59 +1000 | [diff] [blame] | 1135 | if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)) |
| 1136 | || __get_user(tmp, (u8 __user *) ctx) |
| 1137 | || __get_user(tmp, (u8 __user *) (ctx + 1) - 1)) |
| 1138 | return -EFAULT; |
| 1139 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1140 | /* |
| 1141 | * If we get a fault copying the context into the kernel's |
| 1142 | * image of the user's registers, we can't just return -EFAULT |
| 1143 | * because the user's registers will be corrupted. For instance |
| 1144 | * the NIP value may have been updated but not some of the |
| 1145 | * other registers. Given that we have done the access_ok |
| 1146 | * and successfully read the first and last bytes of the region |
| 1147 | * above, this should only happen in an out-of-memory situation |
| 1148 | * or if another thread unmaps the region containing the context. |
| 1149 | * We kill the task with a SIGSEGV in this situation. |
| 1150 | */ |
| 1151 | if (do_setcontext(ctx, regs, 1)) { |
Olof Johansson | d0c3d53 | 2007-10-12 10:20:07 +1000 | [diff] [blame] | 1152 | if (show_unhandled_signals && printk_ratelimit()) |
| 1153 | printk(KERN_INFO "%s[%d]: bad frame in " |
| 1154 | "sys_debug_setcontext: %p nip %08lx " |
| 1155 | "lr %08lx\n", |
| 1156 | current->comm, current->pid, |
| 1157 | ctx, regs->nip, regs->link); |
| 1158 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1159 | force_sig(SIGSEGV, current); |
| 1160 | goto out; |
| 1161 | } |
| 1162 | |
| 1163 | /* |
| 1164 | * It's not clear whether or why it is desirable to save the |
| 1165 | * sigaltstack setting on signal delivery and restore it on |
| 1166 | * signal return. But other architectures do this and we have |
| 1167 | * always done it up until now so it is probably better not to |
| 1168 | * change it. -- paulus |
| 1169 | */ |
| 1170 | do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]); |
| 1171 | |
David Woodhouse | 401d1f0 | 2005-11-15 18:52:18 +0000 | [diff] [blame] | 1172 | set_thread_flag(TIF_RESTOREALL); |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1173 | out: |
| 1174 | return 0; |
| 1175 | } |
| 1176 | #endif |
| 1177 | |
| 1178 | /* |
| 1179 | * OK, we're invoking a handler |
| 1180 | */ |
Christoph Hellwig | f478f54 | 2007-06-04 15:15:52 +1000 | [diff] [blame] | 1181 | int handle_signal32(unsigned long sig, struct k_sigaction *ka, |
Benjamin Herrenschmidt | a3f61dc | 2007-06-04 17:22:48 +1000 | [diff] [blame] | 1182 | siginfo_t *info, sigset_t *oldset, struct pt_regs *regs) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1183 | { |
| 1184 | struct sigcontext __user *sc; |
Benjamin Herrenschmidt | a3f61dc | 2007-06-04 17:22:48 +1000 | [diff] [blame] | 1185 | struct sigframe __user *frame; |
| 1186 | unsigned long newsp = 0; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1187 | |
| 1188 | /* Set up Signal Frame */ |
Josh Boyer | efbda86 | 2009-03-25 06:23:59 +0000 | [diff] [blame] | 1189 | frame = get_sigframe(ka, regs, sizeof(*frame), 1); |
Benjamin Herrenschmidt | a3f61dc | 2007-06-04 17:22:48 +1000 | [diff] [blame] | 1190 | if (unlikely(frame == NULL)) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1191 | goto badframe; |
Benjamin Herrenschmidt | a3f61dc | 2007-06-04 17:22:48 +1000 | [diff] [blame] | 1192 | sc = (struct sigcontext __user *) &frame->sctx; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1193 | |
| 1194 | #if _NSIG != 64 |
| 1195 | #error "Please adjust handle_signal()" |
| 1196 | #endif |
| 1197 | if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler) |
| 1198 | || __put_user(oldset->sig[0], &sc->oldmask) |
| 1199 | #ifdef CONFIG_PPC64 |
| 1200 | || __put_user((oldset->sig[0] >> 32), &sc->_unused[3]) |
| 1201 | #else |
| 1202 | || __put_user(oldset->sig[1], &sc->_unused[3]) |
| 1203 | #endif |
Benjamin Herrenschmidt | a3f61dc | 2007-06-04 17:22:48 +1000 | [diff] [blame] | 1204 | || __put_user(to_user_ptr(&frame->mctx), &sc->regs) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1205 | || __put_user(sig, &sc->signal)) |
| 1206 | goto badframe; |
| 1207 | |
Benjamin Herrenschmidt | a5bba93 | 2006-05-30 13:51:37 +1000 | [diff] [blame] | 1208 | if (vdso32_sigtramp && current->mm->context.vdso_base) { |
Michael Neuling | 16c29d1 | 2008-10-23 00:42:36 +0000 | [diff] [blame] | 1209 | if (save_user_regs(regs, &frame->mctx, 0, 1)) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1210 | goto badframe; |
Benjamin Herrenschmidt | a5bba93 | 2006-05-30 13:51:37 +1000 | [diff] [blame] | 1211 | regs->link = current->mm->context.vdso_base + vdso32_sigtramp; |
Benjamin Herrenschmidt | a7f290d | 2005-11-11 21:15:21 +1100 | [diff] [blame] | 1212 | } else { |
Michael Neuling | 16c29d1 | 2008-10-23 00:42:36 +0000 | [diff] [blame] | 1213 | if (save_user_regs(regs, &frame->mctx, __NR_sigreturn, 1)) |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1214 | goto badframe; |
| 1215 | regs->link = (unsigned long) frame->mctx.tramp; |
| 1216 | } |
| 1217 | |
Paul Mackerras | cc657f5 | 2005-11-14 21:55:15 +1100 | [diff] [blame] | 1218 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ |
| 1219 | |
Benjamin Herrenschmidt | a3f61dc | 2007-06-04 17:22:48 +1000 | [diff] [blame] | 1220 | /* create a stack frame for the caller of the handler */ |
| 1221 | newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1222 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
| 1223 | goto badframe; |
Benjamin Herrenschmidt | a3f61dc | 2007-06-04 17:22:48 +1000 | [diff] [blame] | 1224 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1225 | regs->gpr[1] = newsp; |
| 1226 | regs->gpr[3] = sig; |
| 1227 | regs->gpr[4] = (unsigned long) sc; |
| 1228 | regs->nip = (unsigned long) ka->sa.sa_handler; |
Paul Mackerras | fab5db9 | 2006-06-07 16:14:40 +1000 | [diff] [blame] | 1229 | /* enter the signal handler in big-endian mode */ |
| 1230 | regs->msr &= ~MSR_LE; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1231 | |
| 1232 | return 1; |
| 1233 | |
| 1234 | badframe: |
| 1235 | #ifdef DEBUG_SIG |
| 1236 | printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n", |
| 1237 | regs, frame, newsp); |
| 1238 | #endif |
Olof Johansson | d0c3d53 | 2007-10-12 10:20:07 +1000 | [diff] [blame] | 1239 | if (show_unhandled_signals && printk_ratelimit()) |
| 1240 | printk(KERN_INFO "%s[%d]: bad frame in handle_signal32: " |
| 1241 | "%p nip %08lx lr %08lx\n", |
| 1242 | current->comm, current->pid, |
| 1243 | frame, regs->nip, regs->link); |
| 1244 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1245 | force_sigsegv(sig, current); |
| 1246 | return 0; |
| 1247 | } |
| 1248 | |
| 1249 | /* |
| 1250 | * Do a signal return; undo the signal stack. |
| 1251 | */ |
| 1252 | long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
| 1253 | struct pt_regs *regs) |
| 1254 | { |
| 1255 | struct sigcontext __user *sc; |
| 1256 | struct sigcontext sigctx; |
| 1257 | struct mcontext __user *sr; |
Olof Johansson | d0c3d53 | 2007-10-12 10:20:07 +1000 | [diff] [blame] | 1258 | void __user *addr; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1259 | sigset_t set; |
| 1260 | |
| 1261 | /* Always make any pending restarted system calls return -EINTR */ |
| 1262 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 1263 | |
| 1264 | sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE); |
Olof Johansson | d0c3d53 | 2007-10-12 10:20:07 +1000 | [diff] [blame] | 1265 | addr = sc; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1266 | if (copy_from_user(&sigctx, sc, sizeof(sigctx))) |
| 1267 | goto badframe; |
| 1268 | |
| 1269 | #ifdef CONFIG_PPC64 |
| 1270 | /* |
| 1271 | * Note that PPC32 puts the upper 32 bits of the sigmask in the |
| 1272 | * unused part of the signal stackframe |
| 1273 | */ |
| 1274 | set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32); |
| 1275 | #else |
| 1276 | set.sig[0] = sigctx.oldmask; |
| 1277 | set.sig[1] = sigctx._unused[3]; |
| 1278 | #endif |
| 1279 | restore_sigmask(&set); |
| 1280 | |
| 1281 | sr = (struct mcontext __user *)from_user_ptr(sigctx.regs); |
Olof Johansson | d0c3d53 | 2007-10-12 10:20:07 +1000 | [diff] [blame] | 1282 | addr = sr; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1283 | if (!access_ok(VERIFY_READ, sr, sizeof(*sr)) |
| 1284 | || restore_user_regs(regs, sr, 1)) |
| 1285 | goto badframe; |
| 1286 | |
David Woodhouse | 401d1f0 | 2005-11-15 18:52:18 +0000 | [diff] [blame] | 1287 | set_thread_flag(TIF_RESTOREALL); |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1288 | return 0; |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1289 | |
| 1290 | badframe: |
Olof Johansson | d0c3d53 | 2007-10-12 10:20:07 +1000 | [diff] [blame] | 1291 | if (show_unhandled_signals && printk_ratelimit()) |
| 1292 | printk(KERN_INFO "%s[%d]: bad frame in sys_sigreturn: " |
| 1293 | "%p nip %08lx lr %08lx\n", |
| 1294 | current->comm, current->pid, |
| 1295 | addr, regs->nip, regs->link); |
| 1296 | |
Stephen Rothwell | 81e7009 | 2005-10-18 11:17:58 +1000 | [diff] [blame] | 1297 | force_sig(SIGSEGV, current); |
| 1298 | return 0; |
| 1299 | } |