Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 7 | * Copyright (C) 1994 - 2000 Ralf Baechle |
| 8 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. |
Leonid Yegoshin | ca75064 | 2013-12-12 16:57:19 +0000 | [diff] [blame] | 9 | * Copyright (C) 2014, Imagination Technologies Ltd. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
Ralf Baechle | 02416dc | 2005-06-15 13:00:12 +0000 | [diff] [blame] | 11 | #include <linux/cache.h> |
Ralf Baechle | c3fc5cd | 2013-05-29 01:07:19 +0200 | [diff] [blame] | 12 | #include <linux/context_tracking.h> |
Ralf Baechle | 1f71792 | 2011-07-27 11:44:47 +0100 | [diff] [blame] | 13 | #include <linux/irqflags.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/sched.h> |
| 15 | #include <linux/mm.h> |
| 16 | #include <linux/personality.h> |
| 17 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/kernel.h> |
| 19 | #include <linux/signal.h> |
| 20 | #include <linux/errno.h> |
| 21 | #include <linux/wait.h> |
| 22 | #include <linux/ptrace.h> |
| 23 | #include <linux/unistd.h> |
Ralf Baechle | 40e084a | 2015-07-29 22:44:53 +0200 | [diff] [blame] | 24 | #include <linux/uprobes.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/compiler.h> |
Ralf Baechle | dbda6ac | 2009-02-08 16:00:26 +0000 | [diff] [blame] | 26 | #include <linux/syscalls.h> |
Atsushi Nemoto | faea623 | 2007-04-16 23:19:44 +0900 | [diff] [blame] | 27 | #include <linux/uaccess.h> |
David Howells | 733e5e4 | 2009-09-09 08:30:21 +0100 | [diff] [blame] | 28 | #include <linux/tracehook.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
Ralf Baechle | e50c0a8 | 2005-05-31 11:49:19 +0000 | [diff] [blame] | 30 | #include <asm/abi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <asm/asm.h> |
| 32 | #include <linux/bitops.h> |
| 33 | #include <asm/cacheflush.h> |
| 34 | #include <asm/fpu.h> |
| 35 | #include <asm/sim.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <asm/ucontext.h> |
| 37 | #include <asm/cpu-features.h> |
Ralf Baechle | 02416dc | 2005-06-15 13:00:12 +0000 | [diff] [blame] | 38 | #include <asm/war.h> |
David Howells | b81947c | 2012-03-28 18:30:02 +0100 | [diff] [blame] | 39 | #include <asm/dsp.h> |
Douglas Leung | 01be057 | 2013-03-25 13:21:11 -0500 | [diff] [blame] | 40 | #include <asm/inst.h> |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 41 | #include <asm/msa.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | #include "signal-common.h" |
| 44 | |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 45 | static int (*save_fp_context)(void __user *sc); |
| 46 | static int (*restore_fp_context)(void __user *sc); |
Ralf Baechle | 137f6f3 | 2009-11-24 19:35:41 +0000 | [diff] [blame] | 47 | |
Ralf Baechle | 6668058 | 2007-02-13 01:31:48 +0000 | [diff] [blame] | 48 | struct sigframe { |
| 49 | u32 sf_ass[4]; /* argument save space for o32 */ |
David Daney | d814c28 | 2010-02-18 16:13:05 -0800 | [diff] [blame] | 50 | u32 sf_pad[2]; /* Was: signal trampoline */ |
Paul Burton | f1fe2d2 | 2015-07-27 12:58:21 -0700 | [diff] [blame] | 51 | |
| 52 | /* Matches struct ucontext from its uc_mcontext field onwards */ |
Ralf Baechle | 6668058 | 2007-02-13 01:31:48 +0000 | [diff] [blame] | 53 | struct sigcontext sf_sc; |
| 54 | sigset_t sf_mask; |
Paul Burton | f1fe2d2 | 2015-07-27 12:58:21 -0700 | [diff] [blame] | 55 | unsigned long long sf_extcontext[0]; |
Ralf Baechle | 6668058 | 2007-02-13 01:31:48 +0000 | [diff] [blame] | 56 | }; |
| 57 | |
Franck Bui-Huu | c0b9bae | 2007-02-05 15:24:21 +0100 | [diff] [blame] | 58 | struct rt_sigframe { |
| 59 | u32 rs_ass[4]; /* argument save space for o32 */ |
David Daney | d814c28 | 2010-02-18 16:13:05 -0800 | [diff] [blame] | 60 | u32 rs_pad[2]; /* Was: signal trampoline */ |
Franck Bui-Huu | c0b9bae | 2007-02-05 15:24:21 +0100 | [diff] [blame] | 61 | struct siginfo rs_info; |
| 62 | struct ucontext rs_uc; |
| 63 | }; |
| 64 | |
Paul Burton | 4eec81d | 2018-11-07 23:14:08 +0000 | [diff] [blame] | 65 | #ifdef CONFIG_MIPS_FP_SUPPORT |
| 66 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | /* |
Paul Burton | b2ead52 | 2014-01-27 15:23:02 +0000 | [diff] [blame] | 68 | * Thread saved context copy to/from a signal context presumed to be on the |
| 69 | * user stack, and therefore accessed with appropriate macros from uaccess.h. |
| 70 | */ |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 71 | static int copy_fp_to_sigcontext(void __user *sc) |
Paul Burton | b2ead52 | 2014-01-27 15:23:02 +0000 | [diff] [blame] | 72 | { |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 73 | struct mips_abi *abi = current->thread.abi; |
| 74 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; |
| 75 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; |
Paul Burton | b2ead52 | 2014-01-27 15:23:02 +0000 | [diff] [blame] | 76 | int i; |
| 77 | int err = 0; |
Paul Burton | 6f0aba6 | 2015-07-27 12:58:17 -0700 | [diff] [blame] | 78 | int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1; |
Paul Burton | b2ead52 | 2014-01-27 15:23:02 +0000 | [diff] [blame] | 79 | |
Paul Burton | 6f0aba6 | 2015-07-27 12:58:17 -0700 | [diff] [blame] | 80 | for (i = 0; i < NUM_FPU_REGS; i += inc) { |
Paul Burton | b2ead52 | 2014-01-27 15:23:02 +0000 | [diff] [blame] | 81 | err |= |
| 82 | __put_user(get_fpr64(¤t->thread.fpu.fpr[i], 0), |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 83 | &fpregs[i]); |
Paul Burton | b2ead52 | 2014-01-27 15:23:02 +0000 | [diff] [blame] | 84 | } |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 85 | err |= __put_user(current->thread.fpu.fcr31, csr); |
Paul Burton | b2ead52 | 2014-01-27 15:23:02 +0000 | [diff] [blame] | 86 | |
| 87 | return err; |
| 88 | } |
| 89 | |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 90 | static int copy_fp_from_sigcontext(void __user *sc) |
Paul Burton | b2ead52 | 2014-01-27 15:23:02 +0000 | [diff] [blame] | 91 | { |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 92 | struct mips_abi *abi = current->thread.abi; |
| 93 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; |
| 94 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; |
Paul Burton | b2ead52 | 2014-01-27 15:23:02 +0000 | [diff] [blame] | 95 | int i; |
| 96 | int err = 0; |
Paul Burton | 6f0aba6 | 2015-07-27 12:58:17 -0700 | [diff] [blame] | 97 | int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1; |
Paul Burton | b2ead52 | 2014-01-27 15:23:02 +0000 | [diff] [blame] | 98 | u64 fpr_val; |
| 99 | |
Paul Burton | 6f0aba6 | 2015-07-27 12:58:17 -0700 | [diff] [blame] | 100 | for (i = 0; i < NUM_FPU_REGS; i += inc) { |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 101 | err |= __get_user(fpr_val, &fpregs[i]); |
Paul Burton | b2ead52 | 2014-01-27 15:23:02 +0000 | [diff] [blame] | 102 | set_fpr64(¤t->thread.fpu.fpr[i], 0, fpr_val); |
| 103 | } |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 104 | err |= __get_user(current->thread.fpu.fcr31, csr); |
Paul Burton | b2ead52 | 2014-01-27 15:23:02 +0000 | [diff] [blame] | 105 | |
| 106 | return err; |
| 107 | } |
| 108 | |
Paul Burton | 4eec81d | 2018-11-07 23:14:08 +0000 | [diff] [blame] | 109 | #else /* !CONFIG_MIPS_FP_SUPPORT */ |
| 110 | |
| 111 | static int copy_fp_to_sigcontext(void __user *sc) |
| 112 | { |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | static int copy_fp_from_sigcontext(void __user *sc) |
| 117 | { |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | #endif /* !CONFIG_MIPS_FP_SUPPORT */ |
| 122 | |
Paul Burton | b2ead52 | 2014-01-27 15:23:02 +0000 | [diff] [blame] | 123 | /* |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 124 | * Wrappers for the assembly _{save,restore}_fp_context functions. |
| 125 | */ |
| 126 | static int save_hw_fp_context(void __user *sc) |
| 127 | { |
| 128 | struct mips_abi *abi = current->thread.abi; |
| 129 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; |
| 130 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; |
| 131 | |
| 132 | return _save_fp_context(fpregs, csr); |
| 133 | } |
| 134 | |
| 135 | static int restore_hw_fp_context(void __user *sc) |
| 136 | { |
| 137 | struct mips_abi *abi = current->thread.abi; |
| 138 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; |
| 139 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; |
| 140 | |
| 141 | return _restore_fp_context(fpregs, csr); |
| 142 | } |
| 143 | |
| 144 | /* |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 145 | * Extended context handling. |
| 146 | */ |
| 147 | |
| 148 | static inline void __user *sc_to_extcontext(void __user *sc) |
| 149 | { |
| 150 | struct ucontext __user *uc; |
| 151 | |
| 152 | /* |
| 153 | * We can just pretend the sigcontext is always embedded in a struct |
| 154 | * ucontext here, because the offset from sigcontext to extended |
| 155 | * context is the same in the struct sigframe case. |
| 156 | */ |
| 157 | uc = container_of(sc, struct ucontext, uc_mcontext); |
| 158 | return &uc->uc_extcontext; |
| 159 | } |
| 160 | |
Paul Burton | 4eec81d | 2018-11-07 23:14:08 +0000 | [diff] [blame] | 161 | #ifdef CONFIG_CPU_HAS_MSA |
| 162 | |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 163 | static int save_msa_extcontext(void __user *buf) |
| 164 | { |
| 165 | struct msa_extcontext __user *msa = buf; |
| 166 | uint64_t val; |
| 167 | int i, err; |
| 168 | |
| 169 | if (!thread_msa_context_live()) |
| 170 | return 0; |
| 171 | |
| 172 | /* |
| 173 | * Ensure that we can't lose the live MSA context between checking |
| 174 | * for it & writing it to memory. |
| 175 | */ |
| 176 | preempt_disable(); |
| 177 | |
| 178 | if (is_msa_enabled()) { |
| 179 | /* |
| 180 | * There are no EVA versions of the vector register load/store |
| 181 | * instructions, so MSA context has to be saved to kernel memory |
| 182 | * and then copied to user memory. The save to kernel memory |
| 183 | * should already have been done when handling scalar FP |
| 184 | * context. |
| 185 | */ |
Masahiro Yamada | 97f2645 | 2016-08-03 13:45:50 -0700 | [diff] [blame] | 186 | BUG_ON(IS_ENABLED(CONFIG_EVA)); |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 187 | |
| 188 | err = __put_user(read_msa_csr(), &msa->csr); |
| 189 | err |= _save_msa_all_upper(&msa->wr); |
| 190 | |
| 191 | preempt_enable(); |
| 192 | } else { |
| 193 | preempt_enable(); |
| 194 | |
| 195 | err = __put_user(current->thread.fpu.msacsr, &msa->csr); |
| 196 | |
| 197 | for (i = 0; i < NUM_FPU_REGS; i++) { |
| 198 | val = get_fpr64(¤t->thread.fpu.fpr[i], 1); |
| 199 | err |= __put_user(val, &msa->wr[i]); |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | err |= __put_user(MSA_EXTCONTEXT_MAGIC, &msa->ext.magic); |
| 204 | err |= __put_user(sizeof(*msa), &msa->ext.size); |
| 205 | |
| 206 | return err ? -EFAULT : sizeof(*msa); |
| 207 | } |
| 208 | |
| 209 | static int restore_msa_extcontext(void __user *buf, unsigned int size) |
| 210 | { |
| 211 | struct msa_extcontext __user *msa = buf; |
| 212 | unsigned long long val; |
| 213 | unsigned int csr; |
| 214 | int i, err; |
| 215 | |
| 216 | if (size != sizeof(*msa)) |
| 217 | return -EINVAL; |
| 218 | |
| 219 | err = get_user(csr, &msa->csr); |
| 220 | if (err) |
| 221 | return err; |
| 222 | |
| 223 | preempt_disable(); |
| 224 | |
| 225 | if (is_msa_enabled()) { |
| 226 | /* |
| 227 | * There are no EVA versions of the vector register load/store |
| 228 | * instructions, so MSA context has to be copied to kernel |
| 229 | * memory and later loaded to registers. The same is true of |
| 230 | * scalar FP context, so FPU & MSA should have already been |
| 231 | * disabled whilst handling scalar FP context. |
| 232 | */ |
Masahiro Yamada | 97f2645 | 2016-08-03 13:45:50 -0700 | [diff] [blame] | 233 | BUG_ON(IS_ENABLED(CONFIG_EVA)); |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 234 | |
| 235 | write_msa_csr(csr); |
| 236 | err |= _restore_msa_all_upper(&msa->wr); |
| 237 | preempt_enable(); |
| 238 | } else { |
| 239 | preempt_enable(); |
| 240 | |
| 241 | current->thread.fpu.msacsr = csr; |
| 242 | |
| 243 | for (i = 0; i < NUM_FPU_REGS; i++) { |
| 244 | err |= __get_user(val, &msa->wr[i]); |
| 245 | set_fpr64(¤t->thread.fpu.fpr[i], 1, val); |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | return err; |
| 250 | } |
| 251 | |
Paul Burton | 4eec81d | 2018-11-07 23:14:08 +0000 | [diff] [blame] | 252 | #else /* !CONFIG_CPU_HAS_MSA */ |
| 253 | |
| 254 | static int save_msa_extcontext(void __user *buf) |
| 255 | { |
| 256 | return 0; |
| 257 | } |
| 258 | |
| 259 | static int restore_msa_extcontext(void __user *buf, unsigned int size) |
| 260 | { |
| 261 | return SIGSYS; |
| 262 | } |
| 263 | |
| 264 | #endif /* !CONFIG_CPU_HAS_MSA */ |
| 265 | |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 266 | static int save_extcontext(void __user *buf) |
| 267 | { |
| 268 | int sz; |
| 269 | |
| 270 | sz = save_msa_extcontext(buf); |
| 271 | if (sz < 0) |
| 272 | return sz; |
| 273 | buf += sz; |
| 274 | |
| 275 | /* If no context was saved then trivially return */ |
| 276 | if (!sz) |
| 277 | return 0; |
| 278 | |
| 279 | /* Write the end marker */ |
| 280 | if (__put_user(END_EXTCONTEXT_MAGIC, (u32 *)buf)) |
| 281 | return -EFAULT; |
| 282 | |
| 283 | sz += sizeof(((struct extcontext *)NULL)->magic); |
| 284 | return sz; |
| 285 | } |
| 286 | |
| 287 | static int restore_extcontext(void __user *buf) |
| 288 | { |
| 289 | struct extcontext ext; |
| 290 | int err; |
| 291 | |
| 292 | while (1) { |
| 293 | err = __get_user(ext.magic, (unsigned int *)buf); |
| 294 | if (err) |
| 295 | return err; |
| 296 | |
| 297 | if (ext.magic == END_EXTCONTEXT_MAGIC) |
| 298 | return 0; |
| 299 | |
| 300 | err = __get_user(ext.size, (unsigned int *)(buf |
| 301 | + offsetof(struct extcontext, size))); |
| 302 | if (err) |
| 303 | return err; |
| 304 | |
| 305 | switch (ext.magic) { |
| 306 | case MSA_EXTCONTEXT_MAGIC: |
| 307 | err = restore_msa_extcontext(buf, ext.size); |
| 308 | break; |
| 309 | |
| 310 | default: |
| 311 | err = -EINVAL; |
| 312 | break; |
| 313 | } |
| 314 | |
| 315 | if (err) |
| 316 | return err; |
| 317 | |
| 318 | buf += ext.size; |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | /* |
Franck Bui-Huu | c3fc4ab | 2007-02-05 15:24:20 +0100 | [diff] [blame] | 323 | * Helper routines |
| 324 | */ |
Paul Burton | d02a40a | 2015-07-27 12:58:18 -0700 | [diff] [blame] | 325 | int protected_save_fp_context(void __user *sc) |
Atsushi Nemoto | faea623 | 2007-04-16 23:19:44 +0900 | [diff] [blame] | 326 | { |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 327 | struct mips_abi *abi = current->thread.abi; |
| 328 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; |
| 329 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; |
Paul Burton | 64243c2 | 2015-07-27 12:58:16 -0700 | [diff] [blame] | 330 | uint32_t __user *used_math = sc + abi->off_sc_used_math; |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 331 | unsigned int used, ext_sz; |
Atsushi Nemoto | faea623 | 2007-04-16 23:19:44 +0900 | [diff] [blame] | 332 | int err; |
Paul Burton | 689ee85 | 2015-07-27 12:58:13 -0700 | [diff] [blame] | 333 | |
Paul Burton | 0d071fa | 2015-07-27 12:58:20 -0700 | [diff] [blame] | 334 | used = used_math() ? USED_FP : 0; |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 335 | if (!used) |
| 336 | goto fp_done; |
Paul Burton | 0d071fa | 2015-07-27 12:58:20 -0700 | [diff] [blame] | 337 | |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 338 | if (!test_thread_flag(TIF_32BIT_FPREGS)) |
| 339 | used |= USED_FR1; |
| 340 | if (test_thread_flag(TIF_HYBRID_FPREGS)) |
| 341 | used |= USED_HYBRID_FPRS; |
Paul Burton | 64243c2 | 2015-07-27 12:58:16 -0700 | [diff] [blame] | 342 | |
Paul Burton | 689ee85 | 2015-07-27 12:58:13 -0700 | [diff] [blame] | 343 | /* |
| 344 | * EVA does not have userland equivalents of ldc1 or sdc1, so |
| 345 | * save to the kernel FP context & copy that to userland below. |
| 346 | */ |
Masahiro Yamada | 97f2645 | 2016-08-03 13:45:50 -0700 | [diff] [blame] | 347 | if (IS_ENABLED(CONFIG_EVA)) |
Paul Burton | 689ee85 | 2015-07-27 12:58:13 -0700 | [diff] [blame] | 348 | lose_fpu(1); |
| 349 | |
Atsushi Nemoto | faea623 | 2007-04-16 23:19:44 +0900 | [diff] [blame] | 350 | while (1) { |
| 351 | lock_fpu_owner(); |
Paul Burton | ff3aa5f | 2014-01-27 15:23:03 +0000 | [diff] [blame] | 352 | if (is_fpu_owner()) { |
| 353 | err = save_fp_context(sc); |
| 354 | unlock_fpu_owner(); |
| 355 | } else { |
| 356 | unlock_fpu_owner(); |
| 357 | err = copy_fp_to_sigcontext(sc); |
| 358 | } |
Atsushi Nemoto | faea623 | 2007-04-16 23:19:44 +0900 | [diff] [blame] | 359 | if (likely(!err)) |
| 360 | break; |
| 361 | /* touch the sigcontext and try again */ |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 362 | err = __put_user(0, &fpregs[0]) | |
| 363 | __put_user(0, &fpregs[31]) | |
| 364 | __put_user(0, csr); |
Atsushi Nemoto | faea623 | 2007-04-16 23:19:44 +0900 | [diff] [blame] | 365 | if (err) |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 366 | return err; /* really bad sigcontext */ |
Atsushi Nemoto | faea623 | 2007-04-16 23:19:44 +0900 | [diff] [blame] | 367 | } |
Paul Burton | 689ee85 | 2015-07-27 12:58:13 -0700 | [diff] [blame] | 368 | |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 369 | fp_done: |
| 370 | ext_sz = err = save_extcontext(sc_to_extcontext(sc)); |
| 371 | if (err < 0) |
| 372 | return err; |
| 373 | used |= ext_sz ? USED_EXTCONTEXT : 0; |
| 374 | |
| 375 | return __put_user(used, used_math); |
Atsushi Nemoto | faea623 | 2007-04-16 23:19:44 +0900 | [diff] [blame] | 376 | } |
| 377 | |
Paul Burton | d02a40a | 2015-07-27 12:58:18 -0700 | [diff] [blame] | 378 | int protected_restore_fp_context(void __user *sc) |
Atsushi Nemoto | faea623 | 2007-04-16 23:19:44 +0900 | [diff] [blame] | 379 | { |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 380 | struct mips_abi *abi = current->thread.abi; |
| 381 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; |
| 382 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; |
Paul Burton | 64243c2 | 2015-07-27 12:58:16 -0700 | [diff] [blame] | 383 | uint32_t __user *used_math = sc + abi->off_sc_used_math; |
| 384 | unsigned int used; |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 385 | int err, sig = 0, tmp __maybe_unused; |
Paul Burton | 64243c2 | 2015-07-27 12:58:16 -0700 | [diff] [blame] | 386 | |
| 387 | err = __get_user(used, used_math); |
Paul Burton | 0d071fa | 2015-07-27 12:58:20 -0700 | [diff] [blame] | 388 | conditional_used_math(used & USED_FP); |
Paul Burton | 64243c2 | 2015-07-27 12:58:16 -0700 | [diff] [blame] | 389 | |
| 390 | /* |
| 391 | * The signal handler may have used FPU; give it up if the program |
| 392 | * doesn't want it following sigreturn. |
| 393 | */ |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 394 | if (err || !(used & USED_FP)) |
Paul Burton | 64243c2 | 2015-07-27 12:58:16 -0700 | [diff] [blame] | 395 | lose_fpu(0); |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 396 | if (err) |
Paul Burton | 64243c2 | 2015-07-27 12:58:16 -0700 | [diff] [blame] | 397 | return err; |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 398 | if (!(used & USED_FP)) |
| 399 | goto fp_done; |
Paul Burton | 64243c2 | 2015-07-27 12:58:16 -0700 | [diff] [blame] | 400 | |
| 401 | err = sig = fpcsr_pending(csr); |
| 402 | if (err < 0) |
| 403 | return err; |
Paul Burton | 689ee85 | 2015-07-27 12:58:13 -0700 | [diff] [blame] | 404 | |
| 405 | /* |
| 406 | * EVA does not have userland equivalents of ldc1 or sdc1, so we |
| 407 | * disable the FPU here such that the code below simply copies to |
| 408 | * the kernel FP context. |
| 409 | */ |
Masahiro Yamada | 97f2645 | 2016-08-03 13:45:50 -0700 | [diff] [blame] | 410 | if (IS_ENABLED(CONFIG_EVA)) |
Paul Burton | 689ee85 | 2015-07-27 12:58:13 -0700 | [diff] [blame] | 411 | lose_fpu(0); |
| 412 | |
Atsushi Nemoto | faea623 | 2007-04-16 23:19:44 +0900 | [diff] [blame] | 413 | while (1) { |
| 414 | lock_fpu_owner(); |
Paul Burton | ff3aa5f | 2014-01-27 15:23:03 +0000 | [diff] [blame] | 415 | if (is_fpu_owner()) { |
| 416 | err = restore_fp_context(sc); |
| 417 | unlock_fpu_owner(); |
| 418 | } else { |
| 419 | unlock_fpu_owner(); |
| 420 | err = copy_fp_from_sigcontext(sc); |
| 421 | } |
Atsushi Nemoto | faea623 | 2007-04-16 23:19:44 +0900 | [diff] [blame] | 422 | if (likely(!err)) |
| 423 | break; |
| 424 | /* touch the sigcontext and try again */ |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 425 | err = __get_user(tmp, &fpregs[0]) | |
| 426 | __get_user(tmp, &fpregs[31]) | |
| 427 | __get_user(tmp, csr); |
Atsushi Nemoto | faea623 | 2007-04-16 23:19:44 +0900 | [diff] [blame] | 428 | if (err) |
| 429 | break; /* really bad sigcontext */ |
| 430 | } |
Paul Burton | 689ee85 | 2015-07-27 12:58:13 -0700 | [diff] [blame] | 431 | |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 432 | fp_done: |
Paul Burton | 6533af4 | 2016-04-21 18:04:53 +0100 | [diff] [blame] | 433 | if (!err && (used & USED_EXTCONTEXT)) |
| 434 | err = restore_extcontext(sc_to_extcontext(sc)); |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 435 | |
Paul Burton | 64243c2 | 2015-07-27 12:58:16 -0700 | [diff] [blame] | 436 | return err ?: sig; |
Atsushi Nemoto | faea623 | 2007-04-16 23:19:44 +0900 | [diff] [blame] | 437 | } |
| 438 | |
Franck Bui-Huu | c3fc4ab | 2007-02-05 15:24:20 +0100 | [diff] [blame] | 439 | int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
| 440 | { |
| 441 | int err = 0; |
| 442 | int i; |
| 443 | |
| 444 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); |
| 445 | |
| 446 | err |= __put_user(0, &sc->sc_regs[0]); |
| 447 | for (i = 1; i < 32; i++) |
| 448 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); |
| 449 | |
Franck Bui-Huu | 9693a85 | 2007-02-02 17:41:47 +0100 | [diff] [blame] | 450 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
| 451 | err |= __put_user(regs->acx, &sc->sc_acx); |
| 452 | #endif |
Franck Bui-Huu | c3fc4ab | 2007-02-05 15:24:20 +0100 | [diff] [blame] | 453 | err |= __put_user(regs->hi, &sc->sc_mdhi); |
| 454 | err |= __put_user(regs->lo, &sc->sc_mdlo); |
| 455 | if (cpu_has_dsp) { |
| 456 | err |= __put_user(mfhi1(), &sc->sc_hi1); |
| 457 | err |= __put_user(mflo1(), &sc->sc_lo1); |
| 458 | err |= __put_user(mfhi2(), &sc->sc_hi2); |
| 459 | err |= __put_user(mflo2(), &sc->sc_lo2); |
| 460 | err |= __put_user(mfhi3(), &sc->sc_hi3); |
| 461 | err |= __put_user(mflo3(), &sc->sc_lo3); |
| 462 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); |
| 463 | } |
| 464 | |
Franck Bui-Huu | c3fc4ab | 2007-02-05 15:24:20 +0100 | [diff] [blame] | 465 | |
Paul Burton | 64243c2 | 2015-07-27 12:58:16 -0700 | [diff] [blame] | 466 | /* |
| 467 | * Save FPU state to signal context. Signal handler |
| 468 | * will "inherit" current FPU state. |
| 469 | */ |
| 470 | err |= protected_save_fp_context(sc); |
| 471 | |
Franck Bui-Huu | c3fc4ab | 2007-02-05 15:24:20 +0100 | [diff] [blame] | 472 | return err; |
| 473 | } |
| 474 | |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 475 | static size_t extcontext_max_size(void) |
| 476 | { |
| 477 | size_t sz = 0; |
| 478 | |
| 479 | /* |
| 480 | * The assumption here is that between this point & the point at which |
| 481 | * the extended context is saved the size of the context should only |
| 482 | * ever be able to shrink (if the task is preempted), but never grow. |
| 483 | * That is, what this function returns is an upper bound on the size of |
| 484 | * the extended context for the current task at the current time. |
| 485 | */ |
| 486 | |
| 487 | if (thread_msa_context_live()) |
| 488 | sz += sizeof(struct msa_extcontext); |
| 489 | |
| 490 | /* If any context is saved then we'll append the end marker */ |
| 491 | if (sz) |
| 492 | sz += sizeof(((struct extcontext *)NULL)->magic); |
| 493 | |
| 494 | return sz; |
| 495 | } |
| 496 | |
Atsushi Nemoto | c6a2f46 | 2007-03-10 01:03:48 +0900 | [diff] [blame] | 497 | int fpcsr_pending(unsigned int __user *fpcsr) |
| 498 | { |
| 499 | int err, sig = 0; |
| 500 | unsigned int csr, enabled; |
| 501 | |
| 502 | err = __get_user(csr, fpcsr); |
| 503 | enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5); |
| 504 | /* |
| 505 | * If the signal handler set some FPU exceptions, clear it and |
| 506 | * send SIGFPE. |
| 507 | */ |
| 508 | if (csr & enabled) { |
| 509 | csr &= ~enabled; |
| 510 | err |= __put_user(csr, fpcsr); |
| 511 | sig = SIGFPE; |
| 512 | } |
| 513 | return err ?: sig; |
| 514 | } |
| 515 | |
Franck Bui-Huu | c3fc4ab | 2007-02-05 15:24:20 +0100 | [diff] [blame] | 516 | int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
| 517 | { |
Franck Bui-Huu | c3fc4ab | 2007-02-05 15:24:20 +0100 | [diff] [blame] | 518 | unsigned long treg; |
| 519 | int err = 0; |
| 520 | int i; |
| 521 | |
| 522 | /* Always make any pending restarted system calls return -EINTR */ |
Andy Lutomirski | f56141e | 2015-02-12 15:01:14 -0800 | [diff] [blame] | 523 | current->restart_block.fn = do_no_restart_syscall; |
Franck Bui-Huu | c3fc4ab | 2007-02-05 15:24:20 +0100 | [diff] [blame] | 524 | |
| 525 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); |
Franck Bui-Huu | 9693a85 | 2007-02-02 17:41:47 +0100 | [diff] [blame] | 526 | |
| 527 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
| 528 | err |= __get_user(regs->acx, &sc->sc_acx); |
| 529 | #endif |
Franck Bui-Huu | c3fc4ab | 2007-02-05 15:24:20 +0100 | [diff] [blame] | 530 | err |= __get_user(regs->hi, &sc->sc_mdhi); |
| 531 | err |= __get_user(regs->lo, &sc->sc_mdlo); |
| 532 | if (cpu_has_dsp) { |
| 533 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); |
| 534 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); |
| 535 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); |
| 536 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); |
| 537 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); |
| 538 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); |
| 539 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); |
| 540 | } |
| 541 | |
| 542 | for (i = 1; i < 32; i++) |
| 543 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); |
| 544 | |
Paul Burton | 64243c2 | 2015-07-27 12:58:16 -0700 | [diff] [blame] | 545 | return err ?: protected_restore_fp_context(sc); |
Franck Bui-Huu | c3fc4ab | 2007-02-05 15:24:20 +0100 | [diff] [blame] | 546 | } |
| 547 | |
Richard Weinberger | 7c4f563 | 2014-03-05 15:35:41 +0100 | [diff] [blame] | 548 | void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, |
Franck Bui-Huu | c3fc4ab | 2007-02-05 15:24:20 +0100 | [diff] [blame] | 549 | size_t frame_size) |
| 550 | { |
| 551 | unsigned long sp; |
| 552 | |
Paul Burton | bf82cb3 | 2015-07-27 12:58:22 -0700 | [diff] [blame] | 553 | /* Leave space for potential extended context */ |
| 554 | frame_size += extcontext_max_size(); |
| 555 | |
Franck Bui-Huu | c3fc4ab | 2007-02-05 15:24:20 +0100 | [diff] [blame] | 556 | /* Default to using normal stack */ |
| 557 | sp = regs->regs[29]; |
| 558 | |
| 559 | /* |
| 560 | * FPU emulator may have it's own trampoline active just |
| 561 | * above the user stack, 16-bytes before the next lowest |
| 562 | * 16 byte boundary. Try to avoid trashing it. |
| 563 | */ |
| 564 | sp -= 32; |
| 565 | |
Richard Weinberger | 7c4f563 | 2014-03-05 15:35:41 +0100 | [diff] [blame] | 566 | sp = sigsp(sp, ksig); |
Franck Bui-Huu | c3fc4ab | 2007-02-05 15:24:20 +0100 | [diff] [blame] | 567 | |
| 568 | return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK)); |
| 569 | } |
| 570 | |
Franck Bui-Huu | c3fc4ab | 2007-02-05 15:24:20 +0100 | [diff] [blame] | 571 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | * Atomically swap in the new signal mask, and wait for a signal. |
| 573 | */ |
| 574 | |
| 575 | #ifdef CONFIG_TRAD_SIGNALS |
Al Viro | 1910f4a | 2012-12-25 16:25:18 -0500 | [diff] [blame] | 576 | SYSCALL_DEFINE1(sigsuspend, sigset_t __user *, uset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | { |
Al Viro | 1910f4a | 2012-12-25 16:25:18 -0500 | [diff] [blame] | 578 | return sys_rt_sigsuspend(uset, sizeof(sigset_t)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | } |
| 580 | #endif |
| 581 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | #ifdef CONFIG_TRAD_SIGNALS |
Ralf Baechle | dbda6ac | 2009-02-08 16:00:26 +0000 | [diff] [blame] | 583 | SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act, |
| 584 | struct sigaction __user *, oact) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | { |
| 586 | struct k_sigaction new_ka, old_ka; |
| 587 | int ret; |
| 588 | int err = 0; |
| 589 | |
| 590 | if (act) { |
| 591 | old_sigset_t mask; |
| 592 | |
Linus Torvalds | 96d4f26 | 2019-01-03 18:57:57 -0800 | [diff] [blame] | 593 | if (!access_ok(act, sizeof(*act))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | return -EFAULT; |
| 595 | err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler); |
| 596 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
| 597 | err |= __get_user(mask, &act->sa_mask.sig[0]); |
| 598 | if (err) |
| 599 | return -EFAULT; |
| 600 | |
| 601 | siginitset(&new_ka.sa.sa_mask, mask); |
| 602 | } |
| 603 | |
| 604 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 605 | |
| 606 | if (!ret && oact) { |
Linus Torvalds | 96d4f26 | 2019-01-03 18:57:57 -0800 | [diff] [blame] | 607 | if (!access_ok(oact, sizeof(*oact))) |
Ralf Baechle | e0daad4 | 2007-02-05 00:10:11 +0000 | [diff] [blame] | 608 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
| 610 | err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler); |
| 611 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); |
| 612 | err |= __put_user(0, &oact->sa_mask.sig[1]); |
| 613 | err |= __put_user(0, &oact->sa_mask.sig[2]); |
| 614 | err |= __put_user(0, &oact->sa_mask.sig[3]); |
| 615 | if (err) |
| 616 | return -EFAULT; |
| 617 | } |
| 618 | |
| 619 | return ret; |
| 620 | } |
| 621 | #endif |
| 622 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | #ifdef CONFIG_TRAD_SIGNALS |
Paul Burton | 96a68b1 | 2018-08-01 13:12:42 -0700 | [diff] [blame] | 624 | asmlinkage void sys_sigreturn(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | { |
Atsushi Nemoto | 9bbf28a3 | 2006-02-01 01:41:09 +0900 | [diff] [blame] | 626 | struct sigframe __user *frame; |
Paul Burton | 96a68b1 | 2018-08-01 13:12:42 -0700 | [diff] [blame] | 627 | struct pt_regs *regs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | sigset_t blocked; |
Atsushi Nemoto | c6a2f46 | 2007-03-10 01:03:48 +0900 | [diff] [blame] | 629 | int sig; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | |
Paul Burton | 96a68b1 | 2018-08-01 13:12:42 -0700 | [diff] [blame] | 631 | regs = current_pt_regs(); |
| 632 | frame = (struct sigframe __user *)regs->regs[29]; |
Linus Torvalds | 96d4f26 | 2019-01-03 18:57:57 -0800 | [diff] [blame] | 633 | if (!access_ok(frame, sizeof(*frame))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | goto badframe; |
| 635 | if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) |
| 636 | goto badframe; |
| 637 | |
Matt Fleming | 8598f3c | 2012-02-14 11:40:52 +0000 | [diff] [blame] | 638 | set_current_blocked(&blocked); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
Paul Burton | 96a68b1 | 2018-08-01 13:12:42 -0700 | [diff] [blame] | 640 | sig = restore_sigcontext(regs, &frame->sf_sc); |
Atsushi Nemoto | c6a2f46 | 2007-03-10 01:03:48 +0900 | [diff] [blame] | 641 | if (sig < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | goto badframe; |
Atsushi Nemoto | c6a2f46 | 2007-03-10 01:03:48 +0900 | [diff] [blame] | 643 | else if (sig) |
| 644 | force_sig(sig, current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | |
| 646 | /* |
| 647 | * Don't let your children do this ... |
| 648 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | __asm__ __volatile__( |
| 650 | "move\t$29, %0\n\t" |
| 651 | "j\tsyscall_exit" |
Paul Burton | 96a68b1 | 2018-08-01 13:12:42 -0700 | [diff] [blame] | 652 | : /* no outputs */ |
| 653 | : "r" (regs)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | /* Unreached */ |
| 655 | |
| 656 | badframe: |
| 657 | force_sig(SIGSEGV, current); |
| 658 | } |
Ralf Baechle | e50c0a8 | 2005-05-31 11:49:19 +0000 | [diff] [blame] | 659 | #endif /* CONFIG_TRAD_SIGNALS */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | |
Paul Burton | 96a68b1 | 2018-08-01 13:12:42 -0700 | [diff] [blame] | 661 | asmlinkage void sys_rt_sigreturn(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | { |
Atsushi Nemoto | 9bbf28a3 | 2006-02-01 01:41:09 +0900 | [diff] [blame] | 663 | struct rt_sigframe __user *frame; |
Paul Burton | 96a68b1 | 2018-08-01 13:12:42 -0700 | [diff] [blame] | 664 | struct pt_regs *regs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | sigset_t set; |
Atsushi Nemoto | c6a2f46 | 2007-03-10 01:03:48 +0900 | [diff] [blame] | 666 | int sig; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | |
Paul Burton | 96a68b1 | 2018-08-01 13:12:42 -0700 | [diff] [blame] | 668 | regs = current_pt_regs(); |
| 669 | frame = (struct rt_sigframe __user *)regs->regs[29]; |
Linus Torvalds | 96d4f26 | 2019-01-03 18:57:57 -0800 | [diff] [blame] | 670 | if (!access_ok(frame, sizeof(*frame))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | goto badframe; |
| 672 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) |
| 673 | goto badframe; |
| 674 | |
Matt Fleming | 8598f3c | 2012-02-14 11:40:52 +0000 | [diff] [blame] | 675 | set_current_blocked(&set); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | |
Paul Burton | 96a68b1 | 2018-08-01 13:12:42 -0700 | [diff] [blame] | 677 | sig = restore_sigcontext(regs, &frame->rs_uc.uc_mcontext); |
Atsushi Nemoto | c6a2f46 | 2007-03-10 01:03:48 +0900 | [diff] [blame] | 678 | if (sig < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | goto badframe; |
Atsushi Nemoto | c6a2f46 | 2007-03-10 01:03:48 +0900 | [diff] [blame] | 680 | else if (sig) |
| 681 | force_sig(sig, current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | |
Al Viro | ea536ad | 2012-12-23 03:13:40 -0500 | [diff] [blame] | 683 | if (restore_altstack(&frame->rs_uc.uc_stack)) |
| 684 | goto badframe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | |
| 686 | /* |
| 687 | * Don't let your children do this ... |
| 688 | */ |
| 689 | __asm__ __volatile__( |
| 690 | "move\t$29, %0\n\t" |
| 691 | "j\tsyscall_exit" |
Paul Burton | 96a68b1 | 2018-08-01 13:12:42 -0700 | [diff] [blame] | 692 | : /* no outputs */ |
| 693 | : "r" (regs)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | /* Unreached */ |
| 695 | |
| 696 | badframe: |
| 697 | force_sig(SIGSEGV, current); |
| 698 | } |
| 699 | |
| 700 | #ifdef CONFIG_TRAD_SIGNALS |
Richard Weinberger | 81d103b | 2013-10-06 22:25:42 +0200 | [diff] [blame] | 701 | static int setup_frame(void *sig_return, struct ksignal *ksig, |
| 702 | struct pt_regs *regs, sigset_t *set) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | { |
Atsushi Nemoto | 9bbf28a3 | 2006-02-01 01:41:09 +0900 | [diff] [blame] | 704 | struct sigframe __user *frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | int err = 0; |
| 706 | |
Richard Weinberger | 7c4f563 | 2014-03-05 15:35:41 +0100 | [diff] [blame] | 707 | frame = get_sigframe(ksig, regs, sizeof(*frame)); |
Linus Torvalds | 96d4f26 | 2019-01-03 18:57:57 -0800 | [diff] [blame] | 708 | if (!access_ok(frame, sizeof (*frame))) |
Richard Weinberger | 81d103b | 2013-10-06 22:25:42 +0200 | [diff] [blame] | 709 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | err |= setup_sigcontext(regs, &frame->sf_sc); |
| 712 | err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); |
| 713 | if (err) |
Richard Weinberger | 81d103b | 2013-10-06 22:25:42 +0200 | [diff] [blame] | 714 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | |
| 716 | /* |
| 717 | * Arguments to signal handler: |
| 718 | * |
| 719 | * a0 = signal number |
| 720 | * a1 = 0 (should be cause) |
| 721 | * a2 = pointer to struct sigcontext |
| 722 | * |
| 723 | * $25 and c0_epc point to the signal handler, $29 points to the |
| 724 | * struct sigframe. |
| 725 | */ |
Richard Weinberger | 81d103b | 2013-10-06 22:25:42 +0200 | [diff] [blame] | 726 | regs->regs[ 4] = ksig->sig; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | regs->regs[ 5] = 0; |
| 728 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; |
| 729 | regs->regs[29] = (unsigned long) frame; |
David Daney | d814c28 | 2010-02-18 16:13:05 -0800 | [diff] [blame] | 730 | regs->regs[31] = (unsigned long) sig_return; |
Richard Weinberger | 81d103b | 2013-10-06 22:25:42 +0200 | [diff] [blame] | 731 | regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | |
Franck Bui-Huu | 722bb63 | 2007-02-05 15:24:24 +0100 | [diff] [blame] | 733 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | current->comm, current->pid, |
Franck Bui-Huu | 722bb63 | 2007-02-05 15:24:24 +0100 | [diff] [blame] | 735 | frame, regs->cp0_epc, regs->regs[31]); |
Ralf Baechle | e0daad4 | 2007-02-05 00:10:11 +0000 | [diff] [blame] | 736 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | } |
| 738 | #endif |
| 739 | |
Richard Weinberger | 81d103b | 2013-10-06 22:25:42 +0200 | [diff] [blame] | 740 | static int setup_rt_frame(void *sig_return, struct ksignal *ksig, |
| 741 | struct pt_regs *regs, sigset_t *set) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | { |
Atsushi Nemoto | 9bbf28a3 | 2006-02-01 01:41:09 +0900 | [diff] [blame] | 743 | struct rt_sigframe __user *frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | int err = 0; |
| 745 | |
Richard Weinberger | 7c4f563 | 2014-03-05 15:35:41 +0100 | [diff] [blame] | 746 | frame = get_sigframe(ksig, regs, sizeof(*frame)); |
Linus Torvalds | 96d4f26 | 2019-01-03 18:57:57 -0800 | [diff] [blame] | 747 | if (!access_ok(frame, sizeof (*frame))) |
Richard Weinberger | 81d103b | 2013-10-06 22:25:42 +0200 | [diff] [blame] | 748 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | /* Create siginfo. */ |
Richard Weinberger | 81d103b | 2013-10-06 22:25:42 +0200 | [diff] [blame] | 751 | err |= copy_siginfo_to_user(&frame->rs_info, &ksig->info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 753 | /* Create the ucontext. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | err |= __put_user(0, &frame->rs_uc.uc_flags); |
Atsushi Nemoto | 5665a0a | 2006-02-02 01:26:34 +0900 | [diff] [blame] | 755 | err |= __put_user(NULL, &frame->rs_uc.uc_link); |
Al Viro | ea536ad | 2012-12-23 03:13:40 -0500 | [diff] [blame] | 756 | err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); |
| 758 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); |
| 759 | |
| 760 | if (err) |
Richard Weinberger | 81d103b | 2013-10-06 22:25:42 +0200 | [diff] [blame] | 761 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | |
| 763 | /* |
| 764 | * Arguments to signal handler: |
| 765 | * |
| 766 | * a0 = signal number |
| 767 | * a1 = 0 (should be cause) |
| 768 | * a2 = pointer to ucontext |
| 769 | * |
| 770 | * $25 and c0_epc point to the signal handler, $29 points to |
| 771 | * the struct rt_sigframe. |
| 772 | */ |
Richard Weinberger | 81d103b | 2013-10-06 22:25:42 +0200 | [diff] [blame] | 773 | regs->regs[ 4] = ksig->sig; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | regs->regs[ 5] = (unsigned long) &frame->rs_info; |
| 775 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; |
| 776 | regs->regs[29] = (unsigned long) frame; |
David Daney | d814c28 | 2010-02-18 16:13:05 -0800 | [diff] [blame] | 777 | regs->regs[31] = (unsigned long) sig_return; |
Richard Weinberger | 81d103b | 2013-10-06 22:25:42 +0200 | [diff] [blame] | 778 | regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
Franck Bui-Huu | 722bb63 | 2007-02-05 15:24:24 +0100 | [diff] [blame] | 780 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | current->comm, current->pid, |
| 782 | frame, regs->cp0_epc, regs->regs[31]); |
Franck Bui-Huu | 722bb63 | 2007-02-05 15:24:24 +0100 | [diff] [blame] | 783 | |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 784 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | } |
| 786 | |
Ralf Baechle | 151fd6a | 2007-02-15 11:40:37 +0000 | [diff] [blame] | 787 | struct mips_abi mips_abi = { |
| 788 | #ifdef CONFIG_TRAD_SIGNALS |
| 789 | .setup_frame = setup_frame, |
| 790 | #endif |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 791 | .setup_rt_frame = setup_rt_frame, |
Paul Burton | 7785610 | 2015-07-27 12:58:14 -0700 | [diff] [blame] | 792 | .restart = __NR_restart_syscall, |
| 793 | |
| 794 | .off_sc_fpregs = offsetof(struct sigcontext, sc_fpregs), |
| 795 | .off_sc_fpc_csr = offsetof(struct sigcontext, sc_fpc_csr), |
| 796 | .off_sc_used_math = offsetof(struct sigcontext, sc_used_math), |
Alex Smith | ebb5e78 | 2015-10-21 09:54:38 +0100 | [diff] [blame] | 797 | |
| 798 | .vdso = &vdso_image, |
Ralf Baechle | 151fd6a | 2007-02-15 11:40:37 +0000 | [diff] [blame] | 799 | }; |
| 800 | |
Richard Weinberger | 81d103b | 2013-10-06 22:25:42 +0200 | [diff] [blame] | 801 | static void handle_signal(struct ksignal *ksig, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | { |
Al Viro | b7f9a11 | 2012-05-02 09:59:21 -0400 | [diff] [blame] | 803 | sigset_t *oldset = sigmask_to_save(); |
Ralf Baechle | 129bc8f | 2005-07-11 20:45:51 +0000 | [diff] [blame] | 804 | int ret; |
David Daney | d814c28 | 2010-02-18 16:13:05 -0800 | [diff] [blame] | 805 | struct mips_abi *abi = current->thread.abi; |
| 806 | void *vdso = current->mm->context.vdso; |
Ralf Baechle | 129bc8f | 2005-07-11 20:45:51 +0000 | [diff] [blame] | 807 | |
Paul Burton | 432c6ba | 2016-07-08 11:06:19 +0100 | [diff] [blame] | 808 | /* |
| 809 | * If we were emulating a delay slot instruction, exit that frame such |
| 810 | * that addresses in the sigframe are as expected for userland and we |
| 811 | * don't have a problem if we reuse the thread's frame for an |
| 812 | * instruction within the signal handler. |
| 813 | */ |
| 814 | dsemul_thread_rollback(regs); |
| 815 | |
Al Viro | 8f5a00eb | 2010-09-28 18:50:37 +0100 | [diff] [blame] | 816 | if (regs->regs[0]) { |
| 817 | switch(regs->regs[2]) { |
| 818 | case ERESTART_RESTARTBLOCK: |
| 819 | case ERESTARTNOHAND: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | regs->regs[2] = EINTR; |
| 821 | break; |
Al Viro | 8f5a00eb | 2010-09-28 18:50:37 +0100 | [diff] [blame] | 822 | case ERESTARTSYS: |
Richard Weinberger | 81d103b | 2013-10-06 22:25:42 +0200 | [diff] [blame] | 823 | if (!(ksig->ka.sa.sa_flags & SA_RESTART)) { |
Al Viro | 8f5a00eb | 2010-09-28 18:50:37 +0100 | [diff] [blame] | 824 | regs->regs[2] = EINTR; |
| 825 | break; |
| 826 | } |
| 827 | /* fallthrough */ |
| 828 | case ERESTARTNOINTR: |
| 829 | regs->regs[7] = regs->regs[26]; |
| 830 | regs->regs[2] = regs->regs[0]; |
| 831 | regs->cp0_epc -= 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 834 | regs->regs[0] = 0; /* Don't deal with this again. */ |
Al Viro | 8f5a00eb | 2010-09-28 18:50:37 +0100 | [diff] [blame] | 835 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | |
Paul Burton | 662d855 | 2018-06-24 09:33:22 -0700 | [diff] [blame] | 837 | rseq_signal_deliver(ksig, regs); |
Paul Burton | 9ea141a | 2018-06-14 10:13:53 -0700 | [diff] [blame] | 838 | |
Leonid Yegoshin | 7939469 | 2015-10-19 11:39:55 -0700 | [diff] [blame] | 839 | if (sig_uses_siginfo(&ksig->ka, abi)) |
Alex Smith | ebb5e78 | 2015-10-21 09:54:38 +0100 | [diff] [blame] | 840 | ret = abi->setup_rt_frame(vdso + abi->vdso->off_rt_sigreturn, |
Richard Weinberger | 81d103b | 2013-10-06 22:25:42 +0200 | [diff] [blame] | 841 | ksig, regs, oldset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | else |
Alex Smith | ebb5e78 | 2015-10-21 09:54:38 +0100 | [diff] [blame] | 843 | ret = abi->setup_frame(vdso + abi->vdso->off_sigreturn, |
| 844 | ksig, regs, oldset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | |
Richard Weinberger | 81d103b | 2013-10-06 22:25:42 +0200 | [diff] [blame] | 846 | signal_setup_done(ret, ksig, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | } |
| 848 | |
Ralf Baechle | 151fd6a | 2007-02-15 11:40:37 +0000 | [diff] [blame] | 849 | static void do_signal(struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | { |
Richard Weinberger | 81d103b | 2013-10-06 22:25:42 +0200 | [diff] [blame] | 851 | struct ksignal ksig; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | |
Richard Weinberger | 81d103b | 2013-10-06 22:25:42 +0200 | [diff] [blame] | 853 | if (get_signal(&ksig)) { |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 854 | /* Whee! Actually deliver the signal. */ |
Richard Weinberger | 81d103b | 2013-10-06 22:25:42 +0200 | [diff] [blame] | 855 | handle_signal(&ksig, regs); |
Ralf Baechle | 45887e1 | 2006-08-03 21:54:13 +0100 | [diff] [blame] | 856 | return; |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 857 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | if (regs->regs[0]) { |
Ralf Baechle | 9ec9b5a | 2012-11-06 14:27:19 +0100 | [diff] [blame] | 860 | switch (regs->regs[2]) { |
| 861 | case ERESTARTNOHAND: |
| 862 | case ERESTARTSYS: |
| 863 | case ERESTARTNOINTR: |
Al Viro | 8f5a00eb | 2010-09-28 18:50:37 +0100 | [diff] [blame] | 864 | regs->regs[2] = regs->regs[0]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | regs->regs[7] = regs->regs[26]; |
Al Viro | 8f5a00eb | 2010-09-28 18:50:37 +0100 | [diff] [blame] | 866 | regs->cp0_epc -= 4; |
Ralf Baechle | 9ec9b5a | 2012-11-06 14:27:19 +0100 | [diff] [blame] | 867 | break; |
| 868 | |
| 869 | case ERESTART_RESTARTBLOCK: |
Ralf Baechle | 151fd6a | 2007-02-15 11:40:37 +0000 | [diff] [blame] | 870 | regs->regs[2] = current->thread.abi->restart; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | regs->regs[7] = regs->regs[26]; |
| 872 | regs->cp0_epc -= 4; |
Ralf Baechle | 9ec9b5a | 2012-11-06 14:27:19 +0100 | [diff] [blame] | 873 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | } |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 875 | regs->regs[0] = 0; /* Don't deal with this again. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | } |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 877 | |
| 878 | /* |
| 879 | * If there's no signal to deliver, we just put the saved sigmask |
| 880 | * back |
| 881 | */ |
Al Viro | 51a7b44 | 2012-05-21 23:33:55 -0400 | [diff] [blame] | 882 | restore_saved_sigmask(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | } |
| 884 | |
| 885 | /* |
| 886 | * notification of userspace execution resumption |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 887 | * - triggered by the TIF_WORK_MASK flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | */ |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 889 | asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | __u32 thread_info_flags) |
| 891 | { |
Ralf Baechle | 1f71792 | 2011-07-27 11:44:47 +0100 | [diff] [blame] | 892 | local_irq_enable(); |
| 893 | |
Ralf Baechle | c3fc5cd | 2013-05-29 01:07:19 +0200 | [diff] [blame] | 894 | user_exit(); |
| 895 | |
Ralf Baechle | 40e084a | 2015-07-29 22:44:53 +0200 | [diff] [blame] | 896 | if (thread_info_flags & _TIF_UPROBE) |
| 897 | uprobe_notify_resume(regs); |
| 898 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | /* deal with pending signal delivery */ |
Al Viro | 6fd84c0 | 2012-05-23 15:28:58 -0400 | [diff] [blame] | 900 | if (thread_info_flags & _TIF_SIGPENDING) |
Ralf Baechle | 151fd6a | 2007-02-15 11:40:37 +0000 | [diff] [blame] | 901 | do_signal(regs); |
David Howells | d0420c8 | 2009-09-02 09:14:16 +0100 | [diff] [blame] | 902 | |
| 903 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { |
| 904 | clear_thread_flag(TIF_NOTIFY_RESUME); |
| 905 | tracehook_notify_resume(regs); |
Paul Burton | 662d855 | 2018-06-24 09:33:22 -0700 | [diff] [blame] | 906 | rseq_handle_notify_resume(NULL, regs); |
David Howells | d0420c8 | 2009-09-02 09:14:16 +0100 | [diff] [blame] | 907 | } |
Ralf Baechle | c3fc5cd | 2013-05-29 01:07:19 +0200 | [diff] [blame] | 908 | |
| 909 | user_enter(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | } |
Ralf Baechle | 137f6f3 | 2009-11-24 19:35:41 +0000 | [diff] [blame] | 911 | |
Paul Burton | 4eec81d | 2018-11-07 23:14:08 +0000 | [diff] [blame] | 912 | #if defined(CONFIG_SMP) && defined(CONFIG_MIPS_FP_SUPPORT) |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 913 | static int smp_save_fp_context(void __user *sc) |
Ralf Baechle | 137f6f3 | 2009-11-24 19:35:41 +0000 | [diff] [blame] | 914 | { |
| 915 | return raw_cpu_has_fpu |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 916 | ? save_hw_fp_context(sc) |
Paul Burton | b2ead52 | 2014-01-27 15:23:02 +0000 | [diff] [blame] | 917 | : copy_fp_to_sigcontext(sc); |
Ralf Baechle | 137f6f3 | 2009-11-24 19:35:41 +0000 | [diff] [blame] | 918 | } |
| 919 | |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 920 | static int smp_restore_fp_context(void __user *sc) |
Ralf Baechle | 137f6f3 | 2009-11-24 19:35:41 +0000 | [diff] [blame] | 921 | { |
| 922 | return raw_cpu_has_fpu |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 923 | ? restore_hw_fp_context(sc) |
Paul Burton | b2ead52 | 2014-01-27 15:23:02 +0000 | [diff] [blame] | 924 | : copy_fp_from_sigcontext(sc); |
Ralf Baechle | 137f6f3 | 2009-11-24 19:35:41 +0000 | [diff] [blame] | 925 | } |
| 926 | #endif |
| 927 | |
| 928 | static int signal_setup(void) |
| 929 | { |
Paul Burton | f1fe2d2 | 2015-07-27 12:58:21 -0700 | [diff] [blame] | 930 | /* |
| 931 | * The offset from sigcontext to extended context should be the same |
| 932 | * regardless of the type of signal, such that userland can always know |
| 933 | * where to look if it wishes to find the extended context structures. |
| 934 | */ |
| 935 | BUILD_BUG_ON((offsetof(struct sigframe, sf_extcontext) - |
| 936 | offsetof(struct sigframe, sf_sc)) != |
| 937 | (offsetof(struct rt_sigframe, rs_uc.uc_extcontext) - |
| 938 | offsetof(struct rt_sigframe, rs_uc.uc_mcontext))); |
| 939 | |
Paul Burton | 4eec81d | 2018-11-07 23:14:08 +0000 | [diff] [blame] | 940 | #if defined(CONFIG_SMP) && defined(CONFIG_MIPS_FP_SUPPORT) |
Ralf Baechle | 137f6f3 | 2009-11-24 19:35:41 +0000 | [diff] [blame] | 941 | /* For now just do the cpu_has_fpu check when the functions are invoked */ |
| 942 | save_fp_context = smp_save_fp_context; |
| 943 | restore_fp_context = smp_restore_fp_context; |
| 944 | #else |
| 945 | if (cpu_has_fpu) { |
Paul Burton | 2db9ca0 | 2015-07-27 12:58:15 -0700 | [diff] [blame] | 946 | save_fp_context = save_hw_fp_context; |
| 947 | restore_fp_context = restore_hw_fp_context; |
Ralf Baechle | 137f6f3 | 2009-11-24 19:35:41 +0000 | [diff] [blame] | 948 | } else { |
Paul Burton | 14fa12d | 2014-10-28 11:25:51 +0000 | [diff] [blame] | 949 | save_fp_context = copy_fp_to_sigcontext; |
| 950 | restore_fp_context = copy_fp_from_sigcontext; |
Ralf Baechle | 137f6f3 | 2009-11-24 19:35:41 +0000 | [diff] [blame] | 951 | } |
Leonid Yegoshin | ca75064 | 2013-12-12 16:57:19 +0000 | [diff] [blame] | 952 | #endif /* CONFIG_SMP */ |
Ralf Baechle | 137f6f3 | 2009-11-24 19:35:41 +0000 | [diff] [blame] | 953 | |
| 954 | return 0; |
| 955 | } |
| 956 | |
| 957 | arch_initcall(signal_setup); |