Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * PowerPC version |
3 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
4 | * | |
5 | * Derived from "arch/i386/kernel/signal.c" | |
6 | * Copyright (C) 1991, 1992 Linus Torvalds | |
7 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
1da177e4 LT |
15 | #include <linux/sched.h> |
16 | #include <linux/mm.h> | |
17 | #include <linux/smp.h> | |
1da177e4 LT |
18 | #include <linux/kernel.h> |
19 | #include <linux/signal.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/wait.h> | |
22 | #include <linux/unistd.h> | |
23 | #include <linux/stddef.h> | |
24 | #include <linux/elf.h> | |
25 | #include <linux/ptrace.h> | |
76462232 | 26 | #include <linux/ratelimit.h> |
f3675644 | 27 | #include <linux/syscalls.h> |
1da177e4 LT |
28 | |
29 | #include <asm/sigcontext.h> | |
30 | #include <asm/ucontext.h> | |
7c0f6ba6 | 31 | #include <linux/uaccess.h> |
1da177e4 | 32 | #include <asm/pgtable.h> |
1da177e4 LT |
33 | #include <asm/unistd.h> |
34 | #include <asm/cacheflush.h> | |
a7f31841 | 35 | #include <asm/syscalls.h> |
1da177e4 | 36 | #include <asm/vdso.h> |
ae3a197e | 37 | #include <asm/switch_to.h> |
2b0a576d | 38 | #include <asm/tm.h> |
0545d543 | 39 | #include <asm/asm-prototypes.h> |
1da177e4 | 40 | |
22e38f29 | 41 | #include "signal.h" |
1da177e4 | 42 | |
1da177e4 | 43 | |
6741f3a7 | 44 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs)) |
1da177e4 LT |
45 | #define FP_REGS_SIZE sizeof(elf_fpregset_t) |
46 | ||
47 | #define TRAMP_TRACEBACK 3 | |
48 | #define TRAMP_SIZE 6 | |
49 | ||
50 | /* | |
51 | * When we have signals to deliver, we set up on the user stack, | |
52 | * going down from the original stack pointer: | |
53 | * 1) a rt_sigframe struct which contains the ucontext | |
54 | * 2) a gap of __SIGNAL_FRAMESIZE bytes which acts as a dummy caller | |
55 | * frame for the signal handler. | |
56 | */ | |
57 | ||
58 | struct rt_sigframe { | |
59 | /* sys_rt_sigreturn requires the ucontext be the first field */ | |
60 | struct ucontext uc; | |
2b0a576d MN |
61 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
62 | struct ucontext uc_transact; | |
63 | #endif | |
1da177e4 LT |
64 | unsigned long _unused[2]; |
65 | unsigned int tramp[TRAMP_SIZE]; | |
29e646df AV |
66 | struct siginfo __user *pinfo; |
67 | void __user *puc; | |
1da177e4 | 68 | struct siginfo info; |
573ebfa6 PM |
69 | /* New 64 bit little-endian ABI allows redzone of 512 bytes below sp */ |
70 | char abigap[USER_REDZONE_SIZE]; | |
1da177e4 LT |
71 | } __attribute__ ((aligned (16))); |
72 | ||
d0c3d534 OJ |
73 | static const char fmt32[] = KERN_INFO \ |
74 | "%s[%d]: bad frame in %s: %08lx nip %08lx lr %08lx\n"; | |
75 | static const char fmt64[] = KERN_INFO \ | |
76 | "%s[%d]: bad frame in %s: %016lx nip %016lx lr %016lx\n"; | |
77 | ||
2476c09f AK |
78 | /* |
79 | * This computes a quad word aligned pointer inside the vmx_reserve array | |
80 | * element. For historical reasons sigcontext might not be quad word aligned, | |
81 | * but the location we write the VMX regs to must be. See the comment in | |
82 | * sigcontext for more detail. | |
83 | */ | |
84 | #ifdef CONFIG_ALTIVEC | |
85 | static elf_vrreg_t __user *sigcontext_vmx_regs(struct sigcontext __user *sc) | |
86 | { | |
87 | return (elf_vrreg_t __user *) (((unsigned long)sc->vmx_reserve + 15) & ~0xful); | |
88 | } | |
89 | #endif | |
90 | ||
1da177e4 LT |
91 | /* |
92 | * Set up the sigcontext for the signal frame. | |
93 | */ | |
94 | ||
d1199431 CB |
95 | static long setup_sigcontext(struct sigcontext __user *sc, |
96 | struct task_struct *tsk, int signr, sigset_t *set, | |
97 | unsigned long handler, int ctx_has_vsx_region) | |
1da177e4 LT |
98 | { |
99 | /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the | |
100 | * process never used altivec yet (MSR_VEC is zero in pt_regs of | |
101 | * the context). This is very important because we must ensure we | |
102 | * don't lose the VRSAVE content that may have been set prior to | |
103 | * the process doing its first vector operation | |
48fc7f7e | 104 | * Userland shall check AT_HWCAP to know whether it can rely on the |
1da177e4 LT |
105 | * v_regs pointer or not |
106 | */ | |
107 | #ifdef CONFIG_ALTIVEC | |
2476c09f | 108 | elf_vrreg_t __user *v_regs = sigcontext_vmx_regs(sc); |
d96f234f | 109 | unsigned long vrsave; |
1da177e4 | 110 | #endif |
d1199431 | 111 | struct pt_regs *regs = tsk->thread.regs; |
0be234a4 | 112 | unsigned long msr = regs->msr; |
1da177e4 | 113 | long err = 0; |
a8a4b03a MS |
114 | /* Force usr to alway see softe as 1 (interrupts enabled) */ |
115 | unsigned long softe = 0x1; | |
1da177e4 | 116 | |
d1199431 CB |
117 | BUG_ON(tsk != current); |
118 | ||
1da177e4 LT |
119 | #ifdef CONFIG_ALTIVEC |
120 | err |= __put_user(v_regs, &sc->v_regs); | |
121 | ||
122 | /* save altivec registers */ | |
d1199431 CB |
123 | if (tsk->thread.used_vr) { |
124 | flush_altivec_to_thread(tsk); | |
1da177e4 | 125 | /* Copy 33 vec registers (vr0..31 and vscr) to the stack */ |
d1199431 | 126 | err |= __copy_to_user(v_regs, &tsk->thread.vr_state, |
de79f7b9 | 127 | 33 * sizeof(vector128)); |
1da177e4 LT |
128 | /* set MSR_VEC in the MSR value in the frame to indicate that sc->v_reg) |
129 | * contains valid data. | |
130 | */ | |
0be234a4 | 131 | msr |= MSR_VEC; |
1da177e4 LT |
132 | } |
133 | /* We always copy to/from vrsave, it's 0 if we don't have or don't | |
134 | * use altivec. | |
135 | */ | |
d96f234f AB |
136 | vrsave = 0; |
137 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) { | |
138 | vrsave = mfspr(SPRN_VRSAVE); | |
d1199431 | 139 | tsk->thread.vrsave = vrsave; |
d96f234f AB |
140 | } |
141 | ||
142 | err |= __put_user(vrsave, (u32 __user *)&v_regs[33]); | |
1da177e4 LT |
143 | #else /* CONFIG_ALTIVEC */ |
144 | err |= __put_user(0, &sc->v_regs); | |
145 | #endif /* CONFIG_ALTIVEC */ | |
d1199431 | 146 | flush_fp_to_thread(tsk); |
6a274c08 | 147 | /* copy fpr regs and fpscr */ |
d1199431 | 148 | err |= copy_fpr_to_user(&sc->fp_regs, tsk); |
ec67ad82 MN |
149 | |
150 | /* | |
151 | * Clear the MSR VSX bit to indicate there is no valid state attached | |
152 | * to this context, except in the specific case below where we set it. | |
153 | */ | |
154 | msr &= ~MSR_VSX; | |
c6e6771b | 155 | #ifdef CONFIG_VSX |
ce48b210 MN |
156 | /* |
157 | * Copy VSX low doubleword to local buffer for formatting, | |
158 | * then out to userspace. Update v_regs to point after the | |
159 | * VMX data. | |
160 | */ | |
d1199431 CB |
161 | if (tsk->thread.used_vsr && ctx_has_vsx_region) { |
162 | flush_vsx_to_thread(tsk); | |
ce48b210 | 163 | v_regs += ELF_NVRREG; |
d1199431 | 164 | err |= copy_vsx_to_user(v_regs, tsk); |
ce48b210 MN |
165 | /* set MSR_VSX in the MSR value in the frame to |
166 | * indicate that sc->vs_reg) contains valid data. | |
167 | */ | |
168 | msr |= MSR_VSX; | |
169 | } | |
c6e6771b | 170 | #endif /* CONFIG_VSX */ |
1da177e4 | 171 | err |= __put_user(&sc->gp_regs, &sc->regs); |
1bd79336 | 172 | WARN_ON(!FULL_REGS(regs)); |
1da177e4 | 173 | err |= __copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE); |
0be234a4 | 174 | err |= __put_user(msr, &sc->gp_regs[PT_MSR]); |
a8a4b03a | 175 | err |= __put_user(softe, &sc->gp_regs[PT_SOFTE]); |
1da177e4 LT |
176 | err |= __put_user(signr, &sc->signal); |
177 | err |= __put_user(handler, &sc->handler); | |
178 | if (set != NULL) | |
179 | err |= __put_user(set->sig[0], &sc->oldmask); | |
180 | ||
181 | return err; | |
182 | } | |
183 | ||
2b0a576d MN |
184 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
185 | /* | |
186 | * As above, but Transactional Memory is in use, so deliver sigcontexts | |
187 | * containing checkpointed and transactional register states. | |
188 | * | |
2b3f8e87 MN |
189 | * To do this, we treclaim (done before entering here) to gather both sets of |
190 | * registers and set up the 'normal' sigcontext registers with rolled-back | |
191 | * register values such that a simple signal handler sees a correct | |
192 | * checkpointed register state. If interested, a TM-aware sighandler can | |
193 | * examine the transactional registers in the 2nd sigcontext to determine the | |
194 | * real origin of the signal. | |
2b0a576d MN |
195 | */ |
196 | static long setup_tm_sigcontexts(struct sigcontext __user *sc, | |
197 | struct sigcontext __user *tm_sc, | |
d1199431 | 198 | struct task_struct *tsk, |
2b0a576d MN |
199 | int signr, sigset_t *set, unsigned long handler) |
200 | { | |
201 | /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the | |
202 | * process never used altivec yet (MSR_VEC is zero in pt_regs of | |
203 | * the context). This is very important because we must ensure we | |
204 | * don't lose the VRSAVE content that may have been set prior to | |
205 | * the process doing its first vector operation | |
206 | * Userland shall check AT_HWCAP to know wether it can rely on the | |
207 | * v_regs pointer or not. | |
208 | */ | |
209 | #ifdef CONFIG_ALTIVEC | |
2476c09f AK |
210 | elf_vrreg_t __user *v_regs = sigcontext_vmx_regs(sc); |
211 | elf_vrreg_t __user *tm_v_regs = sigcontext_vmx_regs(tm_sc); | |
2b0a576d | 212 | #endif |
d1199431 | 213 | struct pt_regs *regs = tsk->thread.regs; |
1c200e63 | 214 | unsigned long msr = tsk->thread.regs->msr; |
2b0a576d MN |
215 | long err = 0; |
216 | ||
d1199431 CB |
217 | BUG_ON(tsk != current); |
218 | ||
2b0a576d MN |
219 | BUG_ON(!MSR_TM_ACTIVE(regs->msr)); |
220 | ||
92fb8690 MN |
221 | WARN_ON(tm_suspend_disabled); |
222 | ||
1c200e63 GR |
223 | /* Restore checkpointed FP, VEC, and VSX bits from ckpt_regs as |
224 | * it contains the correct FP, VEC, VSX state after we treclaimed | |
225 | * the transaction and giveup_all() was called on reclaiming. | |
226 | */ | |
227 | msr |= tsk->thread.ckpt_regs.msr & (MSR_FP | MSR_VEC | MSR_VSX); | |
228 | ||
d31626f7 PM |
229 | /* Remove TM bits from thread's MSR. The MSR in the sigcontext |
230 | * just indicates to userland that we were doing a transaction, but we | |
231 | * don't want to return in transactional state. This also ensures | |
232 | * that flush_fp_to_thread won't set TIF_RESTORE_TM again. | |
233 | */ | |
234 | regs->msr &= ~MSR_TS_MASK; | |
235 | ||
2b0a576d MN |
236 | #ifdef CONFIG_ALTIVEC |
237 | err |= __put_user(v_regs, &sc->v_regs); | |
238 | err |= __put_user(tm_v_regs, &tm_sc->v_regs); | |
239 | ||
240 | /* save altivec registers */ | |
d1199431 | 241 | if (tsk->thread.used_vr) { |
2b0a576d | 242 | /* Copy 33 vec registers (vr0..31 and vscr) to the stack */ |
000ec280 | 243 | err |= __copy_to_user(v_regs, &tsk->thread.ckvr_state, |
2b0a576d MN |
244 | 33 * sizeof(vector128)); |
245 | /* If VEC was enabled there are transactional VRs valid too, | |
246 | * else they're a copy of the checkpointed VRs. | |
247 | */ | |
248 | if (msr & MSR_VEC) | |
249 | err |= __copy_to_user(tm_v_regs, | |
dc310669 | 250 | &tsk->thread.vr_state, |
2b0a576d MN |
251 | 33 * sizeof(vector128)); |
252 | else | |
253 | err |= __copy_to_user(tm_v_regs, | |
000ec280 | 254 | &tsk->thread.ckvr_state, |
2b0a576d MN |
255 | 33 * sizeof(vector128)); |
256 | ||
257 | /* set MSR_VEC in the MSR value in the frame to indicate | |
258 | * that sc->v_reg contains valid data. | |
259 | */ | |
260 | msr |= MSR_VEC; | |
261 | } | |
262 | /* We always copy to/from vrsave, it's 0 if we don't have or don't | |
263 | * use altivec. | |
264 | */ | |
408a7e08 | 265 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) |
000ec280 CB |
266 | tsk->thread.ckvrsave = mfspr(SPRN_VRSAVE); |
267 | err |= __put_user(tsk->thread.ckvrsave, (u32 __user *)&v_regs[33]); | |
2b0a576d | 268 | if (msr & MSR_VEC) |
dc310669 | 269 | err |= __put_user(tsk->thread.vrsave, |
2b0a576d MN |
270 | (u32 __user *)&tm_v_regs[33]); |
271 | else | |
000ec280 | 272 | err |= __put_user(tsk->thread.ckvrsave, |
2b0a576d MN |
273 | (u32 __user *)&tm_v_regs[33]); |
274 | ||
275 | #else /* CONFIG_ALTIVEC */ | |
276 | err |= __put_user(0, &sc->v_regs); | |
277 | err |= __put_user(0, &tm_sc->v_regs); | |
278 | #endif /* CONFIG_ALTIVEC */ | |
279 | ||
280 | /* copy fpr regs and fpscr */ | |
000ec280 | 281 | err |= copy_ckfpr_to_user(&sc->fp_regs, tsk); |
2b0a576d | 282 | if (msr & MSR_FP) |
d1199431 | 283 | err |= copy_fpr_to_user(&tm_sc->fp_regs, tsk); |
dc310669 | 284 | else |
000ec280 | 285 | err |= copy_ckfpr_to_user(&tm_sc->fp_regs, tsk); |
2b0a576d MN |
286 | |
287 | #ifdef CONFIG_VSX | |
288 | /* | |
289 | * Copy VSX low doubleword to local buffer for formatting, | |
290 | * then out to userspace. Update v_regs to point after the | |
291 | * VMX data. | |
292 | */ | |
d1199431 | 293 | if (tsk->thread.used_vsr) { |
2b0a576d MN |
294 | v_regs += ELF_NVRREG; |
295 | tm_v_regs += ELF_NVRREG; | |
296 | ||
000ec280 | 297 | err |= copy_ckvsx_to_user(v_regs, tsk); |
2b0a576d MN |
298 | |
299 | if (msr & MSR_VSX) | |
d1199431 | 300 | err |= copy_vsx_to_user(tm_v_regs, tsk); |
dc310669 | 301 | else |
000ec280 | 302 | err |= copy_ckvsx_to_user(tm_v_regs, tsk); |
2b0a576d MN |
303 | |
304 | /* set MSR_VSX in the MSR value in the frame to | |
305 | * indicate that sc->vs_reg) contains valid data. | |
306 | */ | |
307 | msr |= MSR_VSX; | |
308 | } | |
309 | #endif /* CONFIG_VSX */ | |
310 | ||
311 | err |= __put_user(&sc->gp_regs, &sc->regs); | |
312 | err |= __put_user(&tm_sc->gp_regs, &tm_sc->regs); | |
313 | WARN_ON(!FULL_REGS(regs)); | |
314 | err |= __copy_to_user(&tm_sc->gp_regs, regs, GP_REGS_SIZE); | |
315 | err |= __copy_to_user(&sc->gp_regs, | |
d1199431 | 316 | &tsk->thread.ckpt_regs, GP_REGS_SIZE); |
2b0a576d MN |
317 | err |= __put_user(msr, &tm_sc->gp_regs[PT_MSR]); |
318 | err |= __put_user(msr, &sc->gp_regs[PT_MSR]); | |
319 | err |= __put_user(signr, &sc->signal); | |
320 | err |= __put_user(handler, &sc->handler); | |
321 | if (set != NULL) | |
322 | err |= __put_user(set->sig[0], &sc->oldmask); | |
323 | ||
324 | return err; | |
325 | } | |
326 | #endif | |
327 | ||
1da177e4 LT |
328 | /* |
329 | * Restore the sigcontext from the signal frame. | |
330 | */ | |
331 | ||
d1199431 | 332 | static long restore_sigcontext(struct task_struct *tsk, sigset_t *set, int sig, |
1da177e4 LT |
333 | struct sigcontext __user *sc) |
334 | { | |
335 | #ifdef CONFIG_ALTIVEC | |
336 | elf_vrreg_t __user *v_regs; | |
337 | #endif | |
338 | unsigned long err = 0; | |
339 | unsigned long save_r13 = 0; | |
1da177e4 | 340 | unsigned long msr; |
d1199431 | 341 | struct pt_regs *regs = tsk->thread.regs; |
6a274c08 MN |
342 | #ifdef CONFIG_VSX |
343 | int i; | |
344 | #endif | |
1da177e4 | 345 | |
d1199431 CB |
346 | BUG_ON(tsk != current); |
347 | ||
1da177e4 LT |
348 | /* If this is not a signal return, we preserve the TLS in r13 */ |
349 | if (!sig) | |
350 | save_r13 = regs->gpr[13]; | |
351 | ||
fcbc5a97 SR |
352 | /* copy the GPRs */ |
353 | err |= __copy_from_user(regs->gpr, sc->gp_regs, sizeof(regs->gpr)); | |
354 | err |= __get_user(regs->nip, &sc->gp_regs[PT_NIP]); | |
fab5db97 PM |
355 | /* get MSR separately, transfer the LE bit if doing signal return */ |
356 | err |= __get_user(msr, &sc->gp_regs[PT_MSR]); | |
357 | if (sig) | |
358 | regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE); | |
fcbc5a97 SR |
359 | err |= __get_user(regs->orig_gpr3, &sc->gp_regs[PT_ORIG_R3]); |
360 | err |= __get_user(regs->ctr, &sc->gp_regs[PT_CTR]); | |
361 | err |= __get_user(regs->link, &sc->gp_regs[PT_LNK]); | |
362 | err |= __get_user(regs->xer, &sc->gp_regs[PT_XER]); | |
363 | err |= __get_user(regs->ccr, &sc->gp_regs[PT_CCR]); | |
fab5db97 | 364 | /* skip SOFTE */ |
9a81c16b | 365 | regs->trap = 0; |
fcbc5a97 SR |
366 | err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]); |
367 | err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]); | |
368 | err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]); | |
1da177e4 LT |
369 | |
370 | if (!sig) | |
371 | regs->gpr[13] = save_r13; | |
1da177e4 LT |
372 | if (set != NULL) |
373 | err |= __get_user(set->sig[0], &sc->oldmask); | |
374 | ||
ae62fbb5 PM |
375 | /* |
376 | * Force reload of FP/VEC. | |
d1199431 | 377 | * This has to be done before copying stuff into tsk->thread.fpr/vr |
ae62fbb5 PM |
378 | * for the reasons explained in the previous comment. |
379 | */ | |
ce48b210 | 380 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX); |
ae62fbb5 | 381 | |
1da177e4 LT |
382 | #ifdef CONFIG_ALTIVEC |
383 | err |= __get_user(v_regs, &sc->v_regs); | |
1da177e4 LT |
384 | if (err) |
385 | return err; | |
96d4f267 | 386 | if (v_regs && !access_ok(v_regs, 34 * sizeof(vector128))) |
7c85d1f9 | 387 | return -EFAULT; |
1da177e4 | 388 | /* Copy 33 vec registers (vr0..31 and vscr) from the stack */ |
e1c0d66f | 389 | if (v_regs != NULL && (msr & MSR_VEC) != 0) { |
d1199431 | 390 | err |= __copy_from_user(&tsk->thread.vr_state, v_regs, |
1da177e4 | 391 | 33 * sizeof(vector128)); |
d1199431 CB |
392 | tsk->thread.used_vr = true; |
393 | } else if (tsk->thread.used_vr) { | |
394 | memset(&tsk->thread.vr_state, 0, 33 * sizeof(vector128)); | |
e1c0d66f | 395 | } |
1da177e4 | 396 | /* Always get VRSAVE back */ |
b0d436c7 | 397 | if (v_regs != NULL) |
d1199431 | 398 | err |= __get_user(tsk->thread.vrsave, (u32 __user *)&v_regs[33]); |
1da177e4 | 399 | else |
d1199431 | 400 | tsk->thread.vrsave = 0; |
408a7e08 | 401 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) |
d1199431 | 402 | mtspr(SPRN_VRSAVE, tsk->thread.vrsave); |
1da177e4 | 403 | #endif /* CONFIG_ALTIVEC */ |
c6e6771b | 404 | /* restore floating point */ |
d1199431 | 405 | err |= copy_fpr_from_user(tsk, &sc->fp_regs); |
6a274c08 | 406 | #ifdef CONFIG_VSX |
ce48b210 MN |
407 | /* |
408 | * Get additional VSX data. Update v_regs to point after the | |
409 | * VMX data. Copy VSX low doubleword from userspace to local | |
410 | * buffer for formatting, then into the taskstruct. | |
411 | */ | |
412 | v_regs += ELF_NVRREG; | |
e1c0d66f | 413 | if ((msr & MSR_VSX) != 0) { |
d1199431 CB |
414 | err |= copy_vsx_from_user(tsk, v_regs); |
415 | tsk->thread.used_vsr = true; | |
416 | } else { | |
6a274c08 | 417 | for (i = 0; i < 32 ; i++) |
d1199431 CB |
418 | tsk->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0; |
419 | } | |
c6e6771b | 420 | #endif |
1da177e4 LT |
421 | return err; |
422 | } | |
423 | ||
2b0a576d MN |
424 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
425 | /* | |
426 | * Restore the two sigcontexts from the frame of a transactional processes. | |
427 | */ | |
428 | ||
d1199431 | 429 | static long restore_tm_sigcontexts(struct task_struct *tsk, |
2b0a576d MN |
430 | struct sigcontext __user *sc, |
431 | struct sigcontext __user *tm_sc) | |
432 | { | |
433 | #ifdef CONFIG_ALTIVEC | |
434 | elf_vrreg_t __user *v_regs, *tm_v_regs; | |
435 | #endif | |
436 | unsigned long err = 0; | |
437 | unsigned long msr; | |
d1199431 | 438 | struct pt_regs *regs = tsk->thread.regs; |
2b0a576d MN |
439 | #ifdef CONFIG_VSX |
440 | int i; | |
441 | #endif | |
d1199431 CB |
442 | |
443 | BUG_ON(tsk != current); | |
444 | ||
92fb8690 MN |
445 | if (tm_suspend_disabled) |
446 | return -EINVAL; | |
447 | ||
2b0a576d MN |
448 | /* copy the GPRs */ |
449 | err |= __copy_from_user(regs->gpr, tm_sc->gp_regs, sizeof(regs->gpr)); | |
d1199431 | 450 | err |= __copy_from_user(&tsk->thread.ckpt_regs, sc->gp_regs, |
2b0a576d MN |
451 | sizeof(regs->gpr)); |
452 | ||
453 | /* | |
454 | * TFHAR is restored from the checkpointed 'wound-back' ucontext's NIP. | |
455 | * TEXASR was set by the signal delivery reclaim, as was TFIAR. | |
456 | * Users doing anything abhorrent like thread-switching w/ signals for | |
457 | * TM-Suspended code will have to back TEXASR/TFIAR up themselves. | |
458 | * For the case of getting a signal and simply returning from it, | |
459 | * we don't need to re-copy them here. | |
460 | */ | |
461 | err |= __get_user(regs->nip, &tm_sc->gp_regs[PT_NIP]); | |
d1199431 | 462 | err |= __get_user(tsk->thread.tm_tfhar, &sc->gp_regs[PT_NIP]); |
2b0a576d MN |
463 | |
464 | /* get MSR separately, transfer the LE bit if doing signal return */ | |
465 | err |= __get_user(msr, &sc->gp_regs[PT_MSR]); | |
d2b9d2a5 MN |
466 | /* Don't allow reserved mode. */ |
467 | if (MSR_TM_RESV(msr)) | |
468 | return -EINVAL; | |
469 | ||
87b4e539 | 470 | /* pull in MSR LE from user context */ |
2b0a576d MN |
471 | regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE); |
472 | ||
473 | /* The following non-GPR non-FPR non-VR state is also checkpointed: */ | |
474 | err |= __get_user(regs->ctr, &tm_sc->gp_regs[PT_CTR]); | |
475 | err |= __get_user(regs->link, &tm_sc->gp_regs[PT_LNK]); | |
476 | err |= __get_user(regs->xer, &tm_sc->gp_regs[PT_XER]); | |
477 | err |= __get_user(regs->ccr, &tm_sc->gp_regs[PT_CCR]); | |
d1199431 | 478 | err |= __get_user(tsk->thread.ckpt_regs.ctr, |
2b0a576d | 479 | &sc->gp_regs[PT_CTR]); |
d1199431 | 480 | err |= __get_user(tsk->thread.ckpt_regs.link, |
2b0a576d | 481 | &sc->gp_regs[PT_LNK]); |
d1199431 | 482 | err |= __get_user(tsk->thread.ckpt_regs.xer, |
2b0a576d | 483 | &sc->gp_regs[PT_XER]); |
d1199431 | 484 | err |= __get_user(tsk->thread.ckpt_regs.ccr, |
2b0a576d MN |
485 | &sc->gp_regs[PT_CCR]); |
486 | ||
487 | /* These regs are not checkpointed; they can go in 'regs'. */ | |
488 | err |= __get_user(regs->trap, &sc->gp_regs[PT_TRAP]); | |
489 | err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]); | |
490 | err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]); | |
491 | err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]); | |
492 | ||
2b0a576d MN |
493 | /* |
494 | * Force reload of FP/VEC. | |
d1199431 | 495 | * This has to be done before copying stuff into tsk->thread.fpr/vr |
2b0a576d MN |
496 | * for the reasons explained in the previous comment. |
497 | */ | |
498 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX); | |
499 | ||
500 | #ifdef CONFIG_ALTIVEC | |
501 | err |= __get_user(v_regs, &sc->v_regs); | |
502 | err |= __get_user(tm_v_regs, &tm_sc->v_regs); | |
503 | if (err) | |
504 | return err; | |
96d4f267 | 505 | if (v_regs && !access_ok(v_regs, 34 * sizeof(vector128))) |
2b0a576d | 506 | return -EFAULT; |
96d4f267 | 507 | if (tm_v_regs && !access_ok(tm_v_regs, 34 * sizeof(vector128))) |
2b0a576d MN |
508 | return -EFAULT; |
509 | /* Copy 33 vec registers (vr0..31 and vscr) from the stack */ | |
b0d436c7 | 510 | if (v_regs != NULL && tm_v_regs != NULL && (msr & MSR_VEC) != 0) { |
000ec280 | 511 | err |= __copy_from_user(&tsk->thread.ckvr_state, v_regs, |
2b0a576d | 512 | 33 * sizeof(vector128)); |
dc310669 | 513 | err |= __copy_from_user(&tsk->thread.vr_state, tm_v_regs, |
2b0a576d | 514 | 33 * sizeof(vector128)); |
e1c0d66f | 515 | current->thread.used_vr = true; |
2b0a576d | 516 | } |
d1199431 CB |
517 | else if (tsk->thread.used_vr) { |
518 | memset(&tsk->thread.vr_state, 0, 33 * sizeof(vector128)); | |
000ec280 | 519 | memset(&tsk->thread.ckvr_state, 0, 33 * sizeof(vector128)); |
2b0a576d MN |
520 | } |
521 | /* Always get VRSAVE back */ | |
b0d436c7 | 522 | if (v_regs != NULL && tm_v_regs != NULL) { |
000ec280 | 523 | err |= __get_user(tsk->thread.ckvrsave, |
dc310669 CB |
524 | (u32 __user *)&v_regs[33]); |
525 | err |= __get_user(tsk->thread.vrsave, | |
2b0a576d MN |
526 | (u32 __user *)&tm_v_regs[33]); |
527 | } | |
528 | else { | |
d1199431 | 529 | tsk->thread.vrsave = 0; |
000ec280 | 530 | tsk->thread.ckvrsave = 0; |
2b0a576d | 531 | } |
408a7e08 | 532 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) |
d1199431 | 533 | mtspr(SPRN_VRSAVE, tsk->thread.vrsave); |
2b0a576d MN |
534 | #endif /* CONFIG_ALTIVEC */ |
535 | /* restore floating point */ | |
dc310669 | 536 | err |= copy_fpr_from_user(tsk, &tm_sc->fp_regs); |
000ec280 | 537 | err |= copy_ckfpr_from_user(tsk, &sc->fp_regs); |
2b0a576d MN |
538 | #ifdef CONFIG_VSX |
539 | /* | |
540 | * Get additional VSX data. Update v_regs to point after the | |
541 | * VMX data. Copy VSX low doubleword from userspace to local | |
542 | * buffer for formatting, then into the taskstruct. | |
543 | */ | |
544 | if (v_regs && ((msr & MSR_VSX) != 0)) { | |
545 | v_regs += ELF_NVRREG; | |
546 | tm_v_regs += ELF_NVRREG; | |
dc310669 | 547 | err |= copy_vsx_from_user(tsk, tm_v_regs); |
000ec280 | 548 | err |= copy_ckvsx_from_user(tsk, v_regs); |
d1199431 | 549 | tsk->thread.used_vsr = true; |
2b0a576d MN |
550 | } else { |
551 | for (i = 0; i < 32 ; i++) { | |
d1199431 | 552 | tsk->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0; |
000ec280 | 553 | tsk->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = 0; |
2b0a576d MN |
554 | } |
555 | } | |
556 | #endif | |
557 | tm_enable(); | |
e6b8fd02 | 558 | /* Make sure the transaction is marked as failed */ |
d1199431 | 559 | tsk->thread.tm_texasr |= TEXASR_FS; |
e1c3743e BL |
560 | |
561 | /* | |
562 | * Disabling preemption, since it is unsafe to be preempted | |
563 | * with MSR[TS] set without recheckpointing. | |
564 | */ | |
565 | preempt_disable(); | |
566 | ||
567 | /* pull in MSR TS bits from user context */ | |
568 | regs->msr = (regs->msr & ~MSR_TS_MASK) | (msr & MSR_TS_MASK); | |
569 | ||
570 | /* | |
571 | * Ensure that TM is enabled in regs->msr before we leave the signal | |
572 | * handler. It could be the case that (a) user disabled the TM bit | |
573 | * through the manipulation of the MSR bits in uc_mcontext or (b) the | |
574 | * TM bit was disabled because a sufficient number of context switches | |
575 | * happened whilst in the signal handler and load_tm overflowed, | |
576 | * disabling the TM bit. In either case we can end up with an illegal | |
577 | * TM state leading to a TM Bad Thing when we return to userspace. | |
578 | * | |
579 | * CAUTION: | |
580 | * After regs->MSR[TS] being updated, make sure that get_user(), | |
581 | * put_user() or similar functions are *not* called. These | |
582 | * functions can generate page faults which will cause the process | |
583 | * to be de-scheduled with MSR[TS] set but without calling | |
584 | * tm_recheckpoint(). This can cause a bug. | |
585 | */ | |
586 | regs->msr |= MSR_TM; | |
587 | ||
2b0a576d | 588 | /* This loads the checkpointed FP/VEC state, if used */ |
eb5c3f1c | 589 | tm_recheckpoint(&tsk->thread); |
2b0a576d | 590 | |
dc310669 | 591 | msr_check_and_set(msr & (MSR_FP | MSR_VEC)); |
2b0a576d | 592 | if (msr & MSR_FP) { |
dc310669 | 593 | load_fp_state(&tsk->thread.fp_state); |
d1199431 | 594 | regs->msr |= (MSR_FP | tsk->thread.fpexc_mode); |
2b0a576d MN |
595 | } |
596 | if (msr & MSR_VEC) { | |
dc310669 | 597 | load_vr_state(&tsk->thread.vr_state); |
2b0a576d MN |
598 | regs->msr |= MSR_VEC; |
599 | } | |
600 | ||
e1c3743e BL |
601 | preempt_enable(); |
602 | ||
2b0a576d MN |
603 | return err; |
604 | } | |
605 | #endif | |
606 | ||
1da177e4 LT |
607 | /* |
608 | * Setup the trampoline code on the stack | |
609 | */ | |
610 | static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp) | |
611 | { | |
612 | int i; | |
613 | long err = 0; | |
614 | ||
615 | /* addi r1, r1, __SIGNAL_FRAMESIZE # Pop the dummy stackframe */ | |
d16952a6 CL |
616 | err |= __put_user(PPC_INST_ADDI | __PPC_RT(R1) | __PPC_RA(R1) | |
617 | (__SIGNAL_FRAMESIZE & 0xffff), &tramp[0]); | |
1da177e4 | 618 | /* li r0, __NR_[rt_]sigreturn| */ |
d16952a6 | 619 | err |= __put_user(PPC_INST_ADDI | (syscall & 0xffff), &tramp[1]); |
1da177e4 | 620 | /* sc */ |
d16952a6 | 621 | err |= __put_user(PPC_INST_SC, &tramp[2]); |
1da177e4 LT |
622 | |
623 | /* Minimal traceback info */ | |
624 | for (i=TRAMP_TRACEBACK; i < TRAMP_SIZE ;i++) | |
625 | err |= __put_user(0, &tramp[i]); | |
626 | ||
627 | if (!err) | |
628 | flush_icache_range((unsigned long) &tramp[0], | |
629 | (unsigned long) &tramp[TRAMP_SIZE]); | |
630 | ||
631 | return err; | |
632 | } | |
633 | ||
c1cb299e MN |
634 | /* |
635 | * Userspace code may pass a ucontext which doesn't include VSX added | |
636 | * at the end. We need to check for this case. | |
637 | */ | |
638 | #define UCONTEXTSIZEWITHOUTVSX \ | |
639 | (sizeof(struct ucontext) - 32*sizeof(long)) | |
640 | ||
1da177e4 LT |
641 | /* |
642 | * Handle {get,set,swap}_context operations | |
643 | */ | |
f3675644 AV |
644 | SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx, |
645 | struct ucontext __user *, new_ctx, long, ctx_size) | |
1da177e4 LT |
646 | { |
647 | unsigned char tmp; | |
648 | sigset_t set; | |
c1cb299e | 649 | unsigned long new_msr = 0; |
16c29d18 | 650 | int ctx_has_vsx_region = 0; |
1da177e4 | 651 | |
c1cb299e | 652 | if (new_ctx && |
16c29d18 | 653 | get_user(new_msr, &new_ctx->uc_mcontext.gp_regs[PT_MSR])) |
c1cb299e MN |
654 | return -EFAULT; |
655 | /* | |
656 | * Check that the context is not smaller than the original | |
657 | * size (with VMX but without VSX) | |
1da177e4 | 658 | */ |
c1cb299e | 659 | if (ctx_size < UCONTEXTSIZEWITHOUTVSX) |
1da177e4 | 660 | return -EINVAL; |
c1cb299e MN |
661 | /* |
662 | * If the new context state sets the MSR VSX bits but | |
663 | * it doesn't provide VSX state. | |
664 | */ | |
665 | if ((ctx_size < sizeof(struct ucontext)) && | |
666 | (new_msr & MSR_VSX)) | |
667 | return -EINVAL; | |
16c29d18 MN |
668 | /* Does the context have enough room to store VSX data? */ |
669 | if (ctx_size >= sizeof(struct ucontext)) | |
670 | ctx_has_vsx_region = 1; | |
671 | ||
1da177e4 | 672 | if (old_ctx != NULL) { |
96d4f267 | 673 | if (!access_ok(old_ctx, ctx_size) |
d1199431 | 674 | || setup_sigcontext(&old_ctx->uc_mcontext, current, 0, NULL, 0, |
16c29d18 | 675 | ctx_has_vsx_region) |
1da177e4 LT |
676 | || __copy_to_user(&old_ctx->uc_sigmask, |
677 | ¤t->blocked, sizeof(sigset_t))) | |
678 | return -EFAULT; | |
679 | } | |
680 | if (new_ctx == NULL) | |
681 | return 0; | |
96d4f267 | 682 | if (!access_ok(new_ctx, ctx_size) |
1da177e4 | 683 | || __get_user(tmp, (u8 __user *) new_ctx) |
16c29d18 | 684 | || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1)) |
1da177e4 LT |
685 | return -EFAULT; |
686 | ||
687 | /* | |
688 | * If we get a fault copying the context into the kernel's | |
689 | * image of the user's registers, we can't just return -EFAULT | |
690 | * because the user's registers will be corrupted. For instance | |
691 | * the NIP value may have been updated but not some of the | |
692 | * other registers. Given that we have done the access_ok | |
693 | * and successfully read the first and last bytes of the region | |
694 | * above, this should only happen in an out-of-memory situation | |
695 | * or if another thread unmaps the region containing the context. | |
696 | * We kill the task with a SIGSEGV in this situation. | |
697 | */ | |
698 | ||
699 | if (__copy_from_user(&set, &new_ctx->uc_sigmask, sizeof(set))) | |
700 | do_exit(SIGSEGV); | |
17440f17 | 701 | set_current_blocked(&set); |
d1199431 | 702 | if (restore_sigcontext(current, NULL, 0, &new_ctx->uc_mcontext)) |
1da177e4 LT |
703 | do_exit(SIGSEGV); |
704 | ||
705 | /* This returns like rt_sigreturn */ | |
401d1f02 | 706 | set_thread_flag(TIF_RESTOREALL); |
1da177e4 LT |
707 | return 0; |
708 | } | |
709 | ||
710 | ||
711 | /* | |
712 | * Do a signal return; undo the signal stack. | |
713 | */ | |
714 | ||
f3675644 | 715 | SYSCALL_DEFINE0(rt_sigreturn) |
1da177e4 | 716 | { |
f3675644 | 717 | struct pt_regs *regs = current_pt_regs(); |
1da177e4 LT |
718 | struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1]; |
719 | sigset_t set; | |
2b0a576d MN |
720 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
721 | unsigned long msr; | |
722 | #endif | |
1da177e4 LT |
723 | |
724 | /* Always make any pending restarted system calls return -EINTR */ | |
f56141e3 | 725 | current->restart_block.fn = do_no_restart_syscall; |
1da177e4 | 726 | |
96d4f267 | 727 | if (!access_ok(uc, sizeof(*uc))) |
1da177e4 LT |
728 | goto badframe; |
729 | ||
730 | if (__copy_from_user(&set, &uc->uc_sigmask, sizeof(set))) | |
731 | goto badframe; | |
17440f17 | 732 | set_current_blocked(&set); |
78a3e888 | 733 | |
2b0a576d | 734 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
78a3e888 CB |
735 | /* |
736 | * If there is a transactional state then throw it away. | |
737 | * The purpose of a sigreturn is to destroy all traces of the | |
738 | * signal frame, this includes any transactional state created | |
739 | * within in. We only check for suspended as we can never be | |
740 | * active in the kernel, we are active, there is nothing better to | |
741 | * do than go ahead and Bad Thing later. | |
742 | * The cause is not important as there will never be a | |
743 | * recheckpoint so it's not user visible. | |
744 | */ | |
745 | if (MSR_TM_SUSPENDED(mfmsr())) | |
746 | tm_reclaim_current(0); | |
747 | ||
2b0a576d MN |
748 | if (__get_user(msr, &uc->uc_mcontext.gp_regs[PT_MSR])) |
749 | goto badframe; | |
87b4e539 | 750 | if (MSR_TM_ACTIVE(msr)) { |
2b0a576d MN |
751 | /* We recheckpoint on return. */ |
752 | struct ucontext __user *uc_transact; | |
753 | if (__get_user(uc_transact, &uc->uc_link)) | |
754 | goto badframe; | |
d1199431 | 755 | if (restore_tm_sigcontexts(current, &uc->uc_mcontext, |
2b0a576d MN |
756 | &uc_transact->uc_mcontext)) |
757 | goto badframe; | |
897bc3df | 758 | } else |
2b0a576d | 759 | #endif |
897bc3df | 760 | { |
6f5b9f01 | 761 | /* |
897bc3df BL |
762 | * Fall through, for non-TM restore |
763 | * | |
6f5b9f01 BL |
764 | * Unset MSR[TS] on the thread regs since MSR from user |
765 | * context does not have MSR active, and recheckpoint was | |
766 | * not called since restore_tm_sigcontexts() was not called | |
767 | * also. | |
768 | * | |
769 | * If not unsetting it, the code can RFID to userspace with | |
770 | * MSR[TS] set, but without CPU in the proper state, | |
771 | * causing a TM bad thing. | |
772 | */ | |
773 | current->thread.regs->msr &= ~MSR_TS_MASK; | |
774 | if (restore_sigcontext(current, NULL, 1, &uc->uc_mcontext)) | |
775 | goto badframe; | |
776 | } | |
1da177e4 | 777 | |
7cce2465 AV |
778 | if (restore_altstack(&uc->uc_stack)) |
779 | goto badframe; | |
1da177e4 | 780 | |
401d1f02 DW |
781 | set_thread_flag(TIF_RESTOREALL); |
782 | return 0; | |
1da177e4 LT |
783 | |
784 | badframe: | |
76462232 CD |
785 | if (show_unhandled_signals) |
786 | printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32, | |
787 | current->comm, current->pid, "rt_sigreturn", | |
788 | (long)uc, regs->nip, regs->link); | |
d0c3d534 | 789 | |
1da177e4 LT |
790 | force_sig(SIGSEGV, current); |
791 | return 0; | |
792 | } | |
793 | ||
d1199431 CB |
794 | int handle_rt_signal64(struct ksignal *ksig, sigset_t *set, |
795 | struct task_struct *tsk) | |
1da177e4 | 796 | { |
1da177e4 LT |
797 | struct rt_sigframe __user *frame; |
798 | unsigned long newsp = 0; | |
799 | long err = 0; | |
d1199431 CB |
800 | struct pt_regs *regs = tsk->thread.regs; |
801 | ||
802 | BUG_ON(tsk != current); | |
1da177e4 | 803 | |
d1199431 | 804 | frame = get_sigframe(ksig, get_tm_stackpointer(tsk), sizeof(*frame), 0); |
a3f61dc0 | 805 | if (unlikely(frame == NULL)) |
1da177e4 LT |
806 | goto badframe; |
807 | ||
808 | err |= __put_user(&frame->info, &frame->pinfo); | |
809 | err |= __put_user(&frame->uc, &frame->puc); | |
129b69df | 810 | err |= copy_siginfo_to_user(&frame->info, &ksig->info); |
1da177e4 LT |
811 | if (err) |
812 | goto badframe; | |
813 | ||
814 | /* Create the ucontext. */ | |
815 | err |= __put_user(0, &frame->uc.uc_flags); | |
7cce2465 | 816 | err |= __save_altstack(&frame->uc.uc_stack, regs->gpr[1]); |
2b0a576d MN |
817 | #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
818 | if (MSR_TM_ACTIVE(regs->msr)) { | |
819 | /* The ucontext_t passed to userland points to the second | |
820 | * ucontext_t (for transactional state) with its uc_link ptr. | |
821 | */ | |
822 | err |= __put_user(&frame->uc_transact, &frame->uc.uc_link); | |
823 | err |= setup_tm_sigcontexts(&frame->uc.uc_mcontext, | |
824 | &frame->uc_transact.uc_mcontext, | |
d1199431 | 825 | tsk, ksig->sig, NULL, |
129b69df | 826 | (unsigned long)ksig->ka.sa.sa_handler); |
2b0a576d MN |
827 | } else |
828 | #endif | |
829 | { | |
830 | err |= __put_user(0, &frame->uc.uc_link); | |
d1199431 | 831 | err |= setup_sigcontext(&frame->uc.uc_mcontext, tsk, ksig->sig, |
129b69df | 832 | NULL, (unsigned long)ksig->ka.sa.sa_handler, |
2b0a576d MN |
833 | 1); |
834 | } | |
1da177e4 LT |
835 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
836 | if (err) | |
837 | goto badframe; | |
838 | ||
cc657f53 | 839 | /* Make sure signal handler doesn't get spurious FP exceptions */ |
d1199431 | 840 | tsk->thread.fp_state.fpscr = 0; |
cc657f53 | 841 | |
1da177e4 | 842 | /* Set up to return from userspace. */ |
d1199431 CB |
843 | if (vdso64_rt_sigtramp && tsk->mm->context.vdso_base) { |
844 | regs->link = tsk->mm->context.vdso_base + vdso64_rt_sigtramp; | |
1da177e4 LT |
845 | } else { |
846 | err |= setup_trampoline(__NR_rt_sigreturn, &frame->tramp[0]); | |
847 | if (err) | |
848 | goto badframe; | |
849 | regs->link = (unsigned long) &frame->tramp[0]; | |
850 | } | |
1da177e4 LT |
851 | |
852 | /* Allocate a dummy caller frame for the signal handler. */ | |
a3f61dc0 | 853 | newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE; |
1da177e4 LT |
854 | err |= put_user(regs->gpr[1], (unsigned long __user *)newsp); |
855 | ||
856 | /* Set up "regs" so we "return" to the signal handler. */ | |
d606b92a | 857 | if (is_elf2_task()) { |
129b69df | 858 | regs->nip = (unsigned long) ksig->ka.sa.sa_handler; |
d606b92a RR |
859 | regs->gpr[12] = regs->nip; |
860 | } else { | |
861 | /* Handler is *really* a pointer to the function descriptor for | |
862 | * the signal routine. The first entry in the function | |
863 | * descriptor is the entry address of signal and the second | |
864 | * entry is the TOC value we need to use. | |
865 | */ | |
866 | func_descr_t __user *funct_desc_ptr = | |
129b69df | 867 | (func_descr_t __user *) ksig->ka.sa.sa_handler; |
d606b92a RR |
868 | |
869 | err |= get_user(regs->nip, &funct_desc_ptr->entry); | |
870 | err |= get_user(regs->gpr[2], &funct_desc_ptr->toc); | |
871 | } | |
872 | ||
e871c6bb | 873 | /* enter the signal handler in native-endian mode */ |
fab5db97 | 874 | regs->msr &= ~MSR_LE; |
e871c6bb | 875 | regs->msr |= (MSR_KERNEL & MSR_LE); |
1da177e4 | 876 | regs->gpr[1] = newsp; |
129b69df | 877 | regs->gpr[3] = ksig->sig; |
1da177e4 | 878 | regs->result = 0; |
129b69df | 879 | if (ksig->ka.sa.sa_flags & SA_SIGINFO) { |
1da177e4 LT |
880 | err |= get_user(regs->gpr[4], (unsigned long __user *)&frame->pinfo); |
881 | err |= get_user(regs->gpr[5], (unsigned long __user *)&frame->puc); | |
882 | regs->gpr[6] = (unsigned long) frame; | |
883 | } else { | |
884 | regs->gpr[4] = (unsigned long)&frame->uc.uc_mcontext; | |
885 | } | |
886 | if (err) | |
887 | goto badframe; | |
888 | ||
129b69df | 889 | return 0; |
1da177e4 LT |
890 | |
891 | badframe: | |
76462232 CD |
892 | if (show_unhandled_signals) |
893 | printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32, | |
d1199431 | 894 | tsk->comm, tsk->pid, "setup_rt_frame", |
76462232 | 895 | (long)frame, regs->nip, regs->link); |
d0c3d534 | 896 | |
129b69df | 897 | return 1; |
1da177e4 | 898 | } |