3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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
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.
15 #include <linux/sched.h>
17 #include <linux/smp.h>
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>
26 #include <linux/ratelimit.h>
28 #include <asm/sigcontext.h>
29 #include <asm/ucontext.h>
30 #include <asm/uaccess.h>
31 #include <asm/pgtable.h>
32 #include <asm/unistd.h>
33 #include <asm/cacheflush.h>
34 #include <asm/syscalls.h>
36 #include <asm/switch_to.h>
43 #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
44 #define FP_REGS_SIZE sizeof(elf_fpregset_t)
46 #define TRAMP_TRACEBACK 3
50 * When we have signals to deliver, we set up on the user stack,
51 * going down from the original stack pointer:
52 * 1) a rt_sigframe struct which contains the ucontext
53 * 2) a gap of __SIGNAL_FRAMESIZE bytes which acts as a dummy caller
54 * frame for the signal handler.
58 /* sys_rt_sigreturn requires the ucontext be the first field */
60 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
61 struct ucontext uc_transact
;
63 unsigned long _unused
[2];
64 unsigned int tramp
[TRAMP_SIZE
];
65 struct siginfo __user
*pinfo
;
68 /* 64 bit ABI allows for 288 bytes below sp before decrementing it. */
70 } __attribute__ ((aligned (16)));
72 static const char fmt32
[] = KERN_INFO \
73 "%s[%d]: bad frame in %s: %08lx nip %08lx lr %08lx\n";
74 static const char fmt64
[] = KERN_INFO \
75 "%s[%d]: bad frame in %s: %016lx nip %016lx lr %016lx\n";
78 * Set up the sigcontext for the signal frame.
81 static long setup_sigcontext(struct sigcontext __user
*sc
, struct pt_regs
*regs
,
82 int signr
, sigset_t
*set
, unsigned long handler
,
83 int ctx_has_vsx_region
)
85 /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
86 * process never used altivec yet (MSR_VEC is zero in pt_regs of
87 * the context). This is very important because we must ensure we
88 * don't lose the VRSAVE content that may have been set prior to
89 * the process doing its first vector operation
90 * Userland shall check AT_HWCAP to know whether it can rely on the
91 * v_regs pointer or not
94 elf_vrreg_t __user
*v_regs
= (elf_vrreg_t __user
*)(((unsigned long)sc
->vmx_reserve
+ 15) & ~0xful
);
96 unsigned long msr
= regs
->msr
;
99 flush_fp_to_thread(current
);
101 #ifdef CONFIG_ALTIVEC
102 err
|= __put_user(v_regs
, &sc
->v_regs
);
104 /* save altivec registers */
105 if (current
->thread
.used_vr
) {
106 flush_altivec_to_thread(current
);
107 /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
108 err
|= __copy_to_user(v_regs
, current
->thread
.vr
, 33 * sizeof(vector128
));
109 /* set MSR_VEC in the MSR value in the frame to indicate that sc->v_reg)
110 * contains valid data.
114 /* We always copy to/from vrsave, it's 0 if we don't have or don't
117 err
|= __put_user(current
->thread
.vrsave
, (u32 __user
*)&v_regs
[33]);
118 #else /* CONFIG_ALTIVEC */
119 err
|= __put_user(0, &sc
->v_regs
);
120 #endif /* CONFIG_ALTIVEC */
121 flush_fp_to_thread(current
);
122 /* copy fpr regs and fpscr */
123 err
|= copy_fpr_to_user(&sc
->fp_regs
, current
);
126 * Copy VSX low doubleword to local buffer for formatting,
127 * then out to userspace. Update v_regs to point after the
130 if (current
->thread
.used_vsr
&& ctx_has_vsx_region
) {
131 __giveup_vsx(current
);
132 v_regs
+= ELF_NVRREG
;
133 err
|= copy_vsx_to_user(v_regs
, current
);
134 /* set MSR_VSX in the MSR value in the frame to
135 * indicate that sc->vs_reg) contains valid data.
139 #endif /* CONFIG_VSX */
140 err
|= __put_user(&sc
->gp_regs
, &sc
->regs
);
141 WARN_ON(!FULL_REGS(regs
));
142 err
|= __copy_to_user(&sc
->gp_regs
, regs
, GP_REGS_SIZE
);
143 err
|= __put_user(msr
, &sc
->gp_regs
[PT_MSR
]);
144 err
|= __put_user(signr
, &sc
->signal
);
145 err
|= __put_user(handler
, &sc
->handler
);
147 err
|= __put_user(set
->sig
[0], &sc
->oldmask
);
152 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
154 * As above, but Transactional Memory is in use, so deliver sigcontexts
155 * containing checkpointed and transactional register states.
157 * To do this, we treclaim to gather both sets of registers and set up the
158 * 'normal' sigcontext registers with rolled-back register values such that a
159 * simple signal handler sees a correct checkpointed register state.
160 * If interested, a TM-aware sighandler can examine the transactional registers
161 * in the 2nd sigcontext to determine the real origin of the signal.
163 static long setup_tm_sigcontexts(struct sigcontext __user
*sc
,
164 struct sigcontext __user
*tm_sc
,
165 struct pt_regs
*regs
,
166 int signr
, sigset_t
*set
, unsigned long handler
)
168 /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
169 * process never used altivec yet (MSR_VEC is zero in pt_regs of
170 * the context). This is very important because we must ensure we
171 * don't lose the VRSAVE content that may have been set prior to
172 * the process doing its first vector operation
173 * Userland shall check AT_HWCAP to know wether it can rely on the
174 * v_regs pointer or not.
176 #ifdef CONFIG_ALTIVEC
177 elf_vrreg_t __user
*v_regs
= (elf_vrreg_t __user
*)
178 (((unsigned long)sc
->vmx_reserve
+ 15) & ~0xful
);
179 elf_vrreg_t __user
*tm_v_regs
= (elf_vrreg_t __user
*)
180 (((unsigned long)tm_sc
->vmx_reserve
+ 15) & ~0xful
);
182 unsigned long msr
= regs
->msr
;
185 BUG_ON(!MSR_TM_ACTIVE(regs
->msr
));
187 /* tm_reclaim rolls back all reg states, saving checkpointed (older)
188 * GPRs to thread.ckpt_regs and (if used) FPRs to (newer)
189 * thread.transact_fp and/or VRs to (newer) thread.transact_vr.
190 * THEN we save out FP/VRs, if necessary, to the checkpointed (older)
191 * thread.fr[]/vr[]s. The transactional (newer) GPRs are on the
195 tm_reclaim(¤t
->thread
, msr
, TM_CAUSE_SIGNAL
);
197 flush_fp_to_thread(current
);
199 #ifdef CONFIG_ALTIVEC
200 err
|= __put_user(v_regs
, &sc
->v_regs
);
201 err
|= __put_user(tm_v_regs
, &tm_sc
->v_regs
);
203 /* save altivec registers */
204 if (current
->thread
.used_vr
) {
205 flush_altivec_to_thread(current
);
206 /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
207 err
|= __copy_to_user(v_regs
, current
->thread
.vr
,
208 33 * sizeof(vector128
));
209 /* If VEC was enabled there are transactional VRs valid too,
210 * else they're a copy of the checkpointed VRs.
213 err
|= __copy_to_user(tm_v_regs
,
214 current
->thread
.transact_vr
,
215 33 * sizeof(vector128
));
217 err
|= __copy_to_user(tm_v_regs
,
219 33 * sizeof(vector128
));
221 /* set MSR_VEC in the MSR value in the frame to indicate
222 * that sc->v_reg contains valid data.
226 /* We always copy to/from vrsave, it's 0 if we don't have or don't
229 err
|= __put_user(current
->thread
.vrsave
, (u32 __user
*)&v_regs
[33]);
231 err
|= __put_user(current
->thread
.transact_vrsave
,
232 (u32 __user
*)&tm_v_regs
[33]);
234 err
|= __put_user(current
->thread
.vrsave
,
235 (u32 __user
*)&tm_v_regs
[33]);
237 #else /* CONFIG_ALTIVEC */
238 err
|= __put_user(0, &sc
->v_regs
);
239 err
|= __put_user(0, &tm_sc
->v_regs
);
240 #endif /* CONFIG_ALTIVEC */
242 /* copy fpr regs and fpscr */
243 err
|= copy_fpr_to_user(&sc
->fp_regs
, current
);
245 err
|= copy_transact_fpr_to_user(&tm_sc
->fp_regs
, current
);
247 err
|= copy_fpr_to_user(&tm_sc
->fp_regs
, current
);
251 * Copy VSX low doubleword to local buffer for formatting,
252 * then out to userspace. Update v_regs to point after the
255 if (current
->thread
.used_vsr
) {
256 __giveup_vsx(current
);
257 v_regs
+= ELF_NVRREG
;
258 tm_v_regs
+= ELF_NVRREG
;
260 err
|= copy_vsx_to_user(v_regs
, current
);
263 err
|= copy_transact_vsx_to_user(tm_v_regs
, current
);
265 err
|= copy_vsx_to_user(tm_v_regs
, current
);
267 /* set MSR_VSX in the MSR value in the frame to
268 * indicate that sc->vs_reg) contains valid data.
272 #endif /* CONFIG_VSX */
274 err
|= __put_user(&sc
->gp_regs
, &sc
->regs
);
275 err
|= __put_user(&tm_sc
->gp_regs
, &tm_sc
->regs
);
276 WARN_ON(!FULL_REGS(regs
));
277 err
|= __copy_to_user(&tm_sc
->gp_regs
, regs
, GP_REGS_SIZE
);
278 err
|= __copy_to_user(&sc
->gp_regs
,
279 ¤t
->thread
.ckpt_regs
, GP_REGS_SIZE
);
280 err
|= __put_user(msr
, &tm_sc
->gp_regs
[PT_MSR
]);
281 err
|= __put_user(msr
, &sc
->gp_regs
[PT_MSR
]);
282 err
|= __put_user(signr
, &sc
->signal
);
283 err
|= __put_user(handler
, &sc
->handler
);
285 err
|= __put_user(set
->sig
[0], &sc
->oldmask
);
292 * Restore the sigcontext from the signal frame.
295 static long restore_sigcontext(struct pt_regs
*regs
, sigset_t
*set
, int sig
,
296 struct sigcontext __user
*sc
)
298 #ifdef CONFIG_ALTIVEC
299 elf_vrreg_t __user
*v_regs
;
301 unsigned long err
= 0;
302 unsigned long save_r13
= 0;
308 /* If this is not a signal return, we preserve the TLS in r13 */
310 save_r13
= regs
->gpr
[13];
313 err
|= __copy_from_user(regs
->gpr
, sc
->gp_regs
, sizeof(regs
->gpr
));
314 err
|= __get_user(regs
->nip
, &sc
->gp_regs
[PT_NIP
]);
315 /* get MSR separately, transfer the LE bit if doing signal return */
316 err
|= __get_user(msr
, &sc
->gp_regs
[PT_MSR
]);
318 regs
->msr
= (regs
->msr
& ~MSR_LE
) | (msr
& MSR_LE
);
319 err
|= __get_user(regs
->orig_gpr3
, &sc
->gp_regs
[PT_ORIG_R3
]);
320 err
|= __get_user(regs
->ctr
, &sc
->gp_regs
[PT_CTR
]);
321 err
|= __get_user(regs
->link
, &sc
->gp_regs
[PT_LNK
]);
322 err
|= __get_user(regs
->xer
, &sc
->gp_regs
[PT_XER
]);
323 err
|= __get_user(regs
->ccr
, &sc
->gp_regs
[PT_CCR
]);
326 err
|= __get_user(regs
->dar
, &sc
->gp_regs
[PT_DAR
]);
327 err
|= __get_user(regs
->dsisr
, &sc
->gp_regs
[PT_DSISR
]);
328 err
|= __get_user(regs
->result
, &sc
->gp_regs
[PT_RESULT
]);
331 regs
->gpr
[13] = save_r13
;
333 err
|= __get_user(set
->sig
[0], &sc
->oldmask
);
336 * Do this before updating the thread state in
337 * current->thread.fpr/vr. That way, if we get preempted
338 * and another task grabs the FPU/Altivec, it won't be
339 * tempted to save the current CPU state into the thread_struct
340 * and corrupt what we are writing there.
342 discard_lazy_cpu_state();
345 * Force reload of FP/VEC.
346 * This has to be done before copying stuff into current->thread.fpr/vr
347 * for the reasons explained in the previous comment.
349 regs
->msr
&= ~(MSR_FP
| MSR_FE0
| MSR_FE1
| MSR_VEC
| MSR_VSX
);
351 #ifdef CONFIG_ALTIVEC
352 err
|= __get_user(v_regs
, &sc
->v_regs
);
355 if (v_regs
&& !access_ok(VERIFY_READ
, v_regs
, 34 * sizeof(vector128
)))
357 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
358 if (v_regs
!= 0 && (msr
& MSR_VEC
) != 0)
359 err
|= __copy_from_user(current
->thread
.vr
, v_regs
,
360 33 * sizeof(vector128
));
361 else if (current
->thread
.used_vr
)
362 memset(current
->thread
.vr
, 0, 33 * sizeof(vector128
));
363 /* Always get VRSAVE back */
365 err
|= __get_user(current
->thread
.vrsave
, (u32 __user
*)&v_regs
[33]);
367 current
->thread
.vrsave
= 0;
368 #endif /* CONFIG_ALTIVEC */
369 /* restore floating point */
370 err
|= copy_fpr_from_user(current
, &sc
->fp_regs
);
373 * Get additional VSX data. Update v_regs to point after the
374 * VMX data. Copy VSX low doubleword from userspace to local
375 * buffer for formatting, then into the taskstruct.
377 v_regs
+= ELF_NVRREG
;
378 if ((msr
& MSR_VSX
) != 0)
379 err
|= copy_vsx_from_user(current
, v_regs
);
381 for (i
= 0; i
< 32 ; i
++)
382 current
->thread
.fpr
[i
][TS_VSRLOWOFFSET
] = 0;
387 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
389 * Restore the two sigcontexts from the frame of a transactional processes.
392 static long restore_tm_sigcontexts(struct pt_regs
*regs
,
393 struct sigcontext __user
*sc
,
394 struct sigcontext __user
*tm_sc
)
396 #ifdef CONFIG_ALTIVEC
397 elf_vrreg_t __user
*v_regs
, *tm_v_regs
;
399 unsigned long err
= 0;
405 err
|= __copy_from_user(regs
->gpr
, tm_sc
->gp_regs
, sizeof(regs
->gpr
));
406 err
|= __copy_from_user(¤t
->thread
.ckpt_regs
, sc
->gp_regs
,
410 * TFHAR is restored from the checkpointed 'wound-back' ucontext's NIP.
411 * TEXASR was set by the signal delivery reclaim, as was TFIAR.
412 * Users doing anything abhorrent like thread-switching w/ signals for
413 * TM-Suspended code will have to back TEXASR/TFIAR up themselves.
414 * For the case of getting a signal and simply returning from it,
415 * we don't need to re-copy them here.
417 err
|= __get_user(regs
->nip
, &tm_sc
->gp_regs
[PT_NIP
]);
418 err
|= __get_user(current
->thread
.tm_tfhar
, &sc
->gp_regs
[PT_NIP
]);
420 /* get MSR separately, transfer the LE bit if doing signal return */
421 err
|= __get_user(msr
, &sc
->gp_regs
[PT_MSR
]);
422 regs
->msr
= (regs
->msr
& ~MSR_LE
) | (msr
& MSR_LE
);
424 /* The following non-GPR non-FPR non-VR state is also checkpointed: */
425 err
|= __get_user(regs
->ctr
, &tm_sc
->gp_regs
[PT_CTR
]);
426 err
|= __get_user(regs
->link
, &tm_sc
->gp_regs
[PT_LNK
]);
427 err
|= __get_user(regs
->xer
, &tm_sc
->gp_regs
[PT_XER
]);
428 err
|= __get_user(regs
->ccr
, &tm_sc
->gp_regs
[PT_CCR
]);
429 err
|= __get_user(current
->thread
.ckpt_regs
.ctr
,
430 &sc
->gp_regs
[PT_CTR
]);
431 err
|= __get_user(current
->thread
.ckpt_regs
.link
,
432 &sc
->gp_regs
[PT_LNK
]);
433 err
|= __get_user(current
->thread
.ckpt_regs
.xer
,
434 &sc
->gp_regs
[PT_XER
]);
435 err
|= __get_user(current
->thread
.ckpt_regs
.ccr
,
436 &sc
->gp_regs
[PT_CCR
]);
438 /* These regs are not checkpointed; they can go in 'regs'. */
439 err
|= __get_user(regs
->trap
, &sc
->gp_regs
[PT_TRAP
]);
440 err
|= __get_user(regs
->dar
, &sc
->gp_regs
[PT_DAR
]);
441 err
|= __get_user(regs
->dsisr
, &sc
->gp_regs
[PT_DSISR
]);
442 err
|= __get_user(regs
->result
, &sc
->gp_regs
[PT_RESULT
]);
445 * Do this before updating the thread state in
446 * current->thread.fpr/vr. That way, if we get preempted
447 * and another task grabs the FPU/Altivec, it won't be
448 * tempted to save the current CPU state into the thread_struct
449 * and corrupt what we are writing there.
451 discard_lazy_cpu_state();
454 * Force reload of FP/VEC.
455 * This has to be done before copying stuff into current->thread.fpr/vr
456 * for the reasons explained in the previous comment.
458 regs
->msr
&= ~(MSR_FP
| MSR_FE0
| MSR_FE1
| MSR_VEC
| MSR_VSX
);
460 #ifdef CONFIG_ALTIVEC
461 err
|= __get_user(v_regs
, &sc
->v_regs
);
462 err
|= __get_user(tm_v_regs
, &tm_sc
->v_regs
);
465 if (v_regs
&& !access_ok(VERIFY_READ
, v_regs
, 34 * sizeof(vector128
)))
467 if (tm_v_regs
&& !access_ok(VERIFY_READ
,
468 tm_v_regs
, 34 * sizeof(vector128
)))
470 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
471 if (v_regs
!= 0 && tm_v_regs
!= 0 && (msr
& MSR_VEC
) != 0) {
472 err
|= __copy_from_user(current
->thread
.vr
, v_regs
,
473 33 * sizeof(vector128
));
474 err
|= __copy_from_user(current
->thread
.transact_vr
, tm_v_regs
,
475 33 * sizeof(vector128
));
477 else if (current
->thread
.used_vr
) {
478 memset(current
->thread
.vr
, 0, 33 * sizeof(vector128
));
479 memset(current
->thread
.transact_vr
, 0, 33 * sizeof(vector128
));
481 /* Always get VRSAVE back */
482 if (v_regs
!= 0 && tm_v_regs
!= 0) {
483 err
|= __get_user(current
->thread
.vrsave
,
484 (u32 __user
*)&v_regs
[33]);
485 err
|= __get_user(current
->thread
.transact_vrsave
,
486 (u32 __user
*)&tm_v_regs
[33]);
489 current
->thread
.vrsave
= 0;
490 current
->thread
.transact_vrsave
= 0;
492 #endif /* CONFIG_ALTIVEC */
493 /* restore floating point */
494 err
|= copy_fpr_from_user(current
, &sc
->fp_regs
);
495 err
|= copy_transact_fpr_from_user(current
, &tm_sc
->fp_regs
);
498 * Get additional VSX data. Update v_regs to point after the
499 * VMX data. Copy VSX low doubleword from userspace to local
500 * buffer for formatting, then into the taskstruct.
502 if (v_regs
&& ((msr
& MSR_VSX
) != 0)) {
503 v_regs
+= ELF_NVRREG
;
504 tm_v_regs
+= ELF_NVRREG
;
505 err
|= copy_vsx_from_user(current
, v_regs
);
506 err
|= copy_transact_vsx_from_user(current
, tm_v_regs
);
508 for (i
= 0; i
< 32 ; i
++) {
509 current
->thread
.fpr
[i
][TS_VSRLOWOFFSET
] = 0;
510 current
->thread
.transact_fpr
[i
][TS_VSRLOWOFFSET
] = 0;
515 /* This loads the checkpointed FP/VEC state, if used */
516 tm_recheckpoint(¤t
->thread
, msr
);
517 /* The task has moved into TM state S, so ensure MSR reflects this: */
518 regs
->msr
= (regs
->msr
& ~MSR_TS_MASK
) | __MASK(33);
520 /* This loads the speculative FP/VEC state, if used */
522 do_load_up_transact_fpu(¤t
->thread
);
523 regs
->msr
|= (MSR_FP
| current
->thread
.fpexc_mode
);
525 #ifdef CONFIG_ALTIVEC
527 do_load_up_transact_altivec(¤t
->thread
);
528 regs
->msr
|= MSR_VEC
;
537 * Setup the trampoline code on the stack
539 static long setup_trampoline(unsigned int syscall
, unsigned int __user
*tramp
)
544 /* addi r1, r1, __SIGNAL_FRAMESIZE # Pop the dummy stackframe */
545 err
|= __put_user(0x38210000UL
| (__SIGNAL_FRAMESIZE
& 0xffff), &tramp
[0]);
546 /* li r0, __NR_[rt_]sigreturn| */
547 err
|= __put_user(0x38000000UL
| (syscall
& 0xffff), &tramp
[1]);
549 err
|= __put_user(0x44000002UL
, &tramp
[2]);
551 /* Minimal traceback info */
552 for (i
=TRAMP_TRACEBACK
; i
< TRAMP_SIZE
;i
++)
553 err
|= __put_user(0, &tramp
[i
]);
556 flush_icache_range((unsigned long) &tramp
[0],
557 (unsigned long) &tramp
[TRAMP_SIZE
]);
563 * Userspace code may pass a ucontext which doesn't include VSX added
564 * at the end. We need to check for this case.
566 #define UCONTEXTSIZEWITHOUTVSX \
567 (sizeof(struct ucontext) - 32*sizeof(long))
570 * Handle {get,set,swap}_context operations
572 int sys_swapcontext(struct ucontext __user
*old_ctx
,
573 struct ucontext __user
*new_ctx
,
574 long ctx_size
, long r6
, long r7
, long r8
, struct pt_regs
*regs
)
578 unsigned long new_msr
= 0;
579 int ctx_has_vsx_region
= 0;
582 get_user(new_msr
, &new_ctx
->uc_mcontext
.gp_regs
[PT_MSR
]))
585 * Check that the context is not smaller than the original
586 * size (with VMX but without VSX)
588 if (ctx_size
< UCONTEXTSIZEWITHOUTVSX
)
591 * If the new context state sets the MSR VSX bits but
592 * it doesn't provide VSX state.
594 if ((ctx_size
< sizeof(struct ucontext
)) &&
597 /* Does the context have enough room to store VSX data? */
598 if (ctx_size
>= sizeof(struct ucontext
))
599 ctx_has_vsx_region
= 1;
601 if (old_ctx
!= NULL
) {
602 if (!access_ok(VERIFY_WRITE
, old_ctx
, ctx_size
)
603 || setup_sigcontext(&old_ctx
->uc_mcontext
, regs
, 0, NULL
, 0,
605 || __copy_to_user(&old_ctx
->uc_sigmask
,
606 ¤t
->blocked
, sizeof(sigset_t
)))
611 if (!access_ok(VERIFY_READ
, new_ctx
, ctx_size
)
612 || __get_user(tmp
, (u8 __user
*) new_ctx
)
613 || __get_user(tmp
, (u8 __user
*) new_ctx
+ ctx_size
- 1))
617 * If we get a fault copying the context into the kernel's
618 * image of the user's registers, we can't just return -EFAULT
619 * because the user's registers will be corrupted. For instance
620 * the NIP value may have been updated but not some of the
621 * other registers. Given that we have done the access_ok
622 * and successfully read the first and last bytes of the region
623 * above, this should only happen in an out-of-memory situation
624 * or if another thread unmaps the region containing the context.
625 * We kill the task with a SIGSEGV in this situation.
628 if (__copy_from_user(&set
, &new_ctx
->uc_sigmask
, sizeof(set
)))
630 set_current_blocked(&set
);
631 if (restore_sigcontext(regs
, NULL
, 0, &new_ctx
->uc_mcontext
))
634 /* This returns like rt_sigreturn */
635 set_thread_flag(TIF_RESTOREALL
);
641 * Do a signal return; undo the signal stack.
644 int sys_rt_sigreturn(unsigned long r3
, unsigned long r4
, unsigned long r5
,
645 unsigned long r6
, unsigned long r7
, unsigned long r8
,
646 struct pt_regs
*regs
)
648 struct ucontext __user
*uc
= (struct ucontext __user
*)regs
->gpr
[1];
650 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
654 /* Always make any pending restarted system calls return -EINTR */
655 current_thread_info()->restart_block
.fn
= do_no_restart_syscall
;
657 if (!access_ok(VERIFY_READ
, uc
, sizeof(*uc
)))
660 if (__copy_from_user(&set
, &uc
->uc_sigmask
, sizeof(set
)))
662 set_current_blocked(&set
);
663 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
664 if (__get_user(msr
, &uc
->uc_mcontext
.gp_regs
[PT_MSR
]))
666 if (MSR_TM_SUSPENDED(msr
)) {
667 /* We recheckpoint on return. */
668 struct ucontext __user
*uc_transact
;
669 if (__get_user(uc_transact
, &uc
->uc_link
))
671 if (restore_tm_sigcontexts(regs
, &uc
->uc_mcontext
,
672 &uc_transact
->uc_mcontext
))
676 /* Fall through, for non-TM restore */
678 if (restore_sigcontext(regs
, NULL
, 1, &uc
->uc_mcontext
))
681 if (restore_altstack(&uc
->uc_stack
))
684 set_thread_flag(TIF_RESTOREALL
);
689 printk("badframe in sys_rt_sigreturn, regs=%p uc=%p &uc->uc_mcontext=%p\n",
690 regs
, uc
, &uc
->uc_mcontext
);
692 if (show_unhandled_signals
)
693 printk_ratelimited(regs
->msr
& MSR_64BIT
? fmt64
: fmt32
,
694 current
->comm
, current
->pid
, "rt_sigreturn",
695 (long)uc
, regs
->nip
, regs
->link
);
697 force_sig(SIGSEGV
, current
);
701 int handle_rt_signal64(int signr
, struct k_sigaction
*ka
, siginfo_t
*info
,
702 sigset_t
*set
, struct pt_regs
*regs
)
704 /* Handler is *really* a pointer to the function descriptor for
705 * the signal routine. The first entry in the function
706 * descriptor is the entry address of signal and the second
707 * entry is the TOC value we need to use.
709 func_descr_t __user
*funct_desc_ptr
;
710 struct rt_sigframe __user
*frame
;
711 unsigned long newsp
= 0;
714 frame
= get_sigframe(ka
, regs
, sizeof(*frame
), 0);
715 if (unlikely(frame
== NULL
))
718 err
|= __put_user(&frame
->info
, &frame
->pinfo
);
719 err
|= __put_user(&frame
->uc
, &frame
->puc
);
720 err
|= copy_siginfo_to_user(&frame
->info
, info
);
724 /* Create the ucontext. */
725 err
|= __put_user(0, &frame
->uc
.uc_flags
);
726 err
|= __save_altstack(&frame
->uc
.uc_stack
, regs
->gpr
[1]);
727 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
728 if (MSR_TM_ACTIVE(regs
->msr
)) {
729 /* The ucontext_t passed to userland points to the second
730 * ucontext_t (for transactional state) with its uc_link ptr.
732 err
|= __put_user(&frame
->uc_transact
, &frame
->uc
.uc_link
);
733 err
|= setup_tm_sigcontexts(&frame
->uc
.uc_mcontext
,
734 &frame
->uc_transact
.uc_mcontext
,
737 (unsigned long)ka
->sa
.sa_handler
);
741 err
|= __put_user(0, &frame
->uc
.uc_link
);
742 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, regs
, signr
,
743 NULL
, (unsigned long)ka
->sa
.sa_handler
,
746 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
750 /* Make sure signal handler doesn't get spurious FP exceptions */
751 current
->thread
.fpscr
.val
= 0;
752 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
753 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
754 * just indicates to userland that we were doing a transaction, but we
755 * don't want to return in transactional state:
757 regs
->msr
&= ~MSR_TS_MASK
;
760 /* Set up to return from userspace. */
761 if (vdso64_rt_sigtramp
&& current
->mm
->context
.vdso_base
) {
762 regs
->link
= current
->mm
->context
.vdso_base
+ vdso64_rt_sigtramp
;
764 err
|= setup_trampoline(__NR_rt_sigreturn
, &frame
->tramp
[0]);
767 regs
->link
= (unsigned long) &frame
->tramp
[0];
769 funct_desc_ptr
= (func_descr_t __user
*) ka
->sa
.sa_handler
;
771 /* Allocate a dummy caller frame for the signal handler. */
772 newsp
= ((unsigned long)frame
) - __SIGNAL_FRAMESIZE
;
773 err
|= put_user(regs
->gpr
[1], (unsigned long __user
*)newsp
);
775 /* Set up "regs" so we "return" to the signal handler. */
776 err
|= get_user(regs
->nip
, &funct_desc_ptr
->entry
);
777 /* enter the signal handler in big-endian mode */
778 regs
->msr
&= ~MSR_LE
;
779 regs
->gpr
[1] = newsp
;
780 err
|= get_user(regs
->gpr
[2], &funct_desc_ptr
->toc
);
781 regs
->gpr
[3] = signr
;
783 if (ka
->sa
.sa_flags
& SA_SIGINFO
) {
784 err
|= get_user(regs
->gpr
[4], (unsigned long __user
*)&frame
->pinfo
);
785 err
|= get_user(regs
->gpr
[5], (unsigned long __user
*)&frame
->puc
);
786 regs
->gpr
[6] = (unsigned long) frame
;
788 regs
->gpr
[4] = (unsigned long)&frame
->uc
.uc_mcontext
;
797 printk("badframe in setup_rt_frame, regs=%p frame=%p newsp=%lx\n",
800 if (show_unhandled_signals
)
801 printk_ratelimited(regs
->msr
& MSR_64BIT
? fmt64
: fmt32
,
802 current
->comm
, current
->pid
, "setup_rt_frame",
803 (long)frame
, regs
->nip
, regs
->link
);
805 force_sigsegv(signr
, current
);