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
;
100 err
|= __put_user(v_regs
, &sc
->v_regs
);
102 /* save altivec registers */
103 if (current
->thread
.used_vr
) {
104 flush_altivec_to_thread(current
);
105 /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
106 err
|= __copy_to_user(v_regs
, current
->thread
.vr
, 33 * sizeof(vector128
));
107 /* set MSR_VEC in the MSR value in the frame to indicate that sc->v_reg)
108 * contains valid data.
112 /* We always copy to/from vrsave, it's 0 if we don't have or don't
115 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
116 current
->thread
.vrsave
= mfspr(SPRN_VRSAVE
);
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 (done before entering here) to gather both sets of
158 * registers and set up the 'normal' sigcontext registers with rolled-back
159 * register values such that a simple signal handler sees a correct
160 * checkpointed register state. If interested, a TM-aware sighandler can
161 * examine the transactional registers in the 2nd sigcontext to determine the
162 * real origin of the signal.
164 static long setup_tm_sigcontexts(struct sigcontext __user
*sc
,
165 struct sigcontext __user
*tm_sc
,
166 struct pt_regs
*regs
,
167 int signr
, sigset_t
*set
, unsigned long handler
)
169 /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
170 * process never used altivec yet (MSR_VEC is zero in pt_regs of
171 * the context). This is very important because we must ensure we
172 * don't lose the VRSAVE content that may have been set prior to
173 * the process doing its first vector operation
174 * Userland shall check AT_HWCAP to know wether it can rely on the
175 * v_regs pointer or not.
177 #ifdef CONFIG_ALTIVEC
178 elf_vrreg_t __user
*v_regs
= (elf_vrreg_t __user
*)
179 (((unsigned long)sc
->vmx_reserve
+ 15) & ~0xful
);
180 elf_vrreg_t __user
*tm_v_regs
= (elf_vrreg_t __user
*)
181 (((unsigned long)tm_sc
->vmx_reserve
+ 15) & ~0xful
);
183 unsigned long msr
= regs
->msr
;
186 BUG_ON(!MSR_TM_ACTIVE(regs
->msr
));
188 flush_fp_to_thread(current
);
190 #ifdef CONFIG_ALTIVEC
191 err
|= __put_user(v_regs
, &sc
->v_regs
);
192 err
|= __put_user(tm_v_regs
, &tm_sc
->v_regs
);
194 /* save altivec registers */
195 if (current
->thread
.used_vr
) {
196 flush_altivec_to_thread(current
);
197 /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
198 err
|= __copy_to_user(v_regs
, current
->thread
.vr
,
199 33 * sizeof(vector128
));
200 /* If VEC was enabled there are transactional VRs valid too,
201 * else they're a copy of the checkpointed VRs.
204 err
|= __copy_to_user(tm_v_regs
,
205 current
->thread
.transact_vr
,
206 33 * sizeof(vector128
));
208 err
|= __copy_to_user(tm_v_regs
,
210 33 * sizeof(vector128
));
212 /* set MSR_VEC in the MSR value in the frame to indicate
213 * that sc->v_reg contains valid data.
217 /* We always copy to/from vrsave, it's 0 if we don't have or don't
220 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
221 current
->thread
.vrsave
= mfspr(SPRN_VRSAVE
);
222 err
|= __put_user(current
->thread
.vrsave
, (u32 __user
*)&v_regs
[33]);
224 err
|= __put_user(current
->thread
.transact_vrsave
,
225 (u32 __user
*)&tm_v_regs
[33]);
227 err
|= __put_user(current
->thread
.vrsave
,
228 (u32 __user
*)&tm_v_regs
[33]);
230 #else /* CONFIG_ALTIVEC */
231 err
|= __put_user(0, &sc
->v_regs
);
232 err
|= __put_user(0, &tm_sc
->v_regs
);
233 #endif /* CONFIG_ALTIVEC */
235 /* copy fpr regs and fpscr */
236 err
|= copy_fpr_to_user(&sc
->fp_regs
, current
);
238 err
|= copy_transact_fpr_to_user(&tm_sc
->fp_regs
, current
);
240 err
|= copy_fpr_to_user(&tm_sc
->fp_regs
, current
);
244 * Copy VSX low doubleword to local buffer for formatting,
245 * then out to userspace. Update v_regs to point after the
248 if (current
->thread
.used_vsr
) {
249 __giveup_vsx(current
);
250 v_regs
+= ELF_NVRREG
;
251 tm_v_regs
+= ELF_NVRREG
;
253 err
|= copy_vsx_to_user(v_regs
, current
);
256 err
|= copy_transact_vsx_to_user(tm_v_regs
, current
);
258 err
|= copy_vsx_to_user(tm_v_regs
, current
);
260 /* set MSR_VSX in the MSR value in the frame to
261 * indicate that sc->vs_reg) contains valid data.
265 #endif /* CONFIG_VSX */
267 err
|= __put_user(&sc
->gp_regs
, &sc
->regs
);
268 err
|= __put_user(&tm_sc
->gp_regs
, &tm_sc
->regs
);
269 WARN_ON(!FULL_REGS(regs
));
270 err
|= __copy_to_user(&tm_sc
->gp_regs
, regs
, GP_REGS_SIZE
);
271 err
|= __copy_to_user(&sc
->gp_regs
,
272 ¤t
->thread
.ckpt_regs
, GP_REGS_SIZE
);
273 err
|= __put_user(msr
, &tm_sc
->gp_regs
[PT_MSR
]);
274 err
|= __put_user(msr
, &sc
->gp_regs
[PT_MSR
]);
275 err
|= __put_user(signr
, &sc
->signal
);
276 err
|= __put_user(handler
, &sc
->handler
);
278 err
|= __put_user(set
->sig
[0], &sc
->oldmask
);
285 * Restore the sigcontext from the signal frame.
288 static long restore_sigcontext(struct pt_regs
*regs
, sigset_t
*set
, int sig
,
289 struct sigcontext __user
*sc
)
291 #ifdef CONFIG_ALTIVEC
292 elf_vrreg_t __user
*v_regs
;
294 unsigned long err
= 0;
295 unsigned long save_r13
= 0;
301 /* If this is not a signal return, we preserve the TLS in r13 */
303 save_r13
= regs
->gpr
[13];
306 err
|= __copy_from_user(regs
->gpr
, sc
->gp_regs
, sizeof(regs
->gpr
));
307 err
|= __get_user(regs
->nip
, &sc
->gp_regs
[PT_NIP
]);
308 /* get MSR separately, transfer the LE bit if doing signal return */
309 err
|= __get_user(msr
, &sc
->gp_regs
[PT_MSR
]);
311 regs
->msr
= (regs
->msr
& ~MSR_LE
) | (msr
& MSR_LE
);
312 err
|= __get_user(regs
->orig_gpr3
, &sc
->gp_regs
[PT_ORIG_R3
]);
313 err
|= __get_user(regs
->ctr
, &sc
->gp_regs
[PT_CTR
]);
314 err
|= __get_user(regs
->link
, &sc
->gp_regs
[PT_LNK
]);
315 err
|= __get_user(regs
->xer
, &sc
->gp_regs
[PT_XER
]);
316 err
|= __get_user(regs
->ccr
, &sc
->gp_regs
[PT_CCR
]);
319 err
|= __get_user(regs
->dar
, &sc
->gp_regs
[PT_DAR
]);
320 err
|= __get_user(regs
->dsisr
, &sc
->gp_regs
[PT_DSISR
]);
321 err
|= __get_user(regs
->result
, &sc
->gp_regs
[PT_RESULT
]);
324 regs
->gpr
[13] = save_r13
;
326 err
|= __get_user(set
->sig
[0], &sc
->oldmask
);
329 * Do this before updating the thread state in
330 * current->thread.fpr/vr. That way, if we get preempted
331 * and another task grabs the FPU/Altivec, it won't be
332 * tempted to save the current CPU state into the thread_struct
333 * and corrupt what we are writing there.
335 discard_lazy_cpu_state();
338 * Force reload of FP/VEC.
339 * This has to be done before copying stuff into current->thread.fpr/vr
340 * for the reasons explained in the previous comment.
342 regs
->msr
&= ~(MSR_FP
| MSR_FE0
| MSR_FE1
| MSR_VEC
| MSR_VSX
);
344 #ifdef CONFIG_ALTIVEC
345 err
|= __get_user(v_regs
, &sc
->v_regs
);
348 if (v_regs
&& !access_ok(VERIFY_READ
, v_regs
, 34 * sizeof(vector128
)))
350 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
351 if (v_regs
!= NULL
&& (msr
& MSR_VEC
) != 0)
352 err
|= __copy_from_user(current
->thread
.vr
, v_regs
,
353 33 * sizeof(vector128
));
354 else if (current
->thread
.used_vr
)
355 memset(current
->thread
.vr
, 0, 33 * sizeof(vector128
));
356 /* Always get VRSAVE back */
358 err
|= __get_user(current
->thread
.vrsave
, (u32 __user
*)&v_regs
[33]);
360 current
->thread
.vrsave
= 0;
361 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
362 mtspr(SPRN_VRSAVE
, current
->thread
.vrsave
);
363 #endif /* CONFIG_ALTIVEC */
364 /* restore floating point */
365 err
|= copy_fpr_from_user(current
, &sc
->fp_regs
);
368 * Get additional VSX data. Update v_regs to point after the
369 * VMX data. Copy VSX low doubleword from userspace to local
370 * buffer for formatting, then into the taskstruct.
372 v_regs
+= ELF_NVRREG
;
373 if ((msr
& MSR_VSX
) != 0)
374 err
|= copy_vsx_from_user(current
, v_regs
);
376 for (i
= 0; i
< 32 ; i
++)
377 current
->thread
.fpr
[i
][TS_VSRLOWOFFSET
] = 0;
382 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
384 * Restore the two sigcontexts from the frame of a transactional processes.
387 static long restore_tm_sigcontexts(struct pt_regs
*regs
,
388 struct sigcontext __user
*sc
,
389 struct sigcontext __user
*tm_sc
)
391 #ifdef CONFIG_ALTIVEC
392 elf_vrreg_t __user
*v_regs
, *tm_v_regs
;
394 unsigned long err
= 0;
400 err
|= __copy_from_user(regs
->gpr
, tm_sc
->gp_regs
, sizeof(regs
->gpr
));
401 err
|= __copy_from_user(¤t
->thread
.ckpt_regs
, sc
->gp_regs
,
405 * TFHAR is restored from the checkpointed 'wound-back' ucontext's NIP.
406 * TEXASR was set by the signal delivery reclaim, as was TFIAR.
407 * Users doing anything abhorrent like thread-switching w/ signals for
408 * TM-Suspended code will have to back TEXASR/TFIAR up themselves.
409 * For the case of getting a signal and simply returning from it,
410 * we don't need to re-copy them here.
412 err
|= __get_user(regs
->nip
, &tm_sc
->gp_regs
[PT_NIP
]);
413 err
|= __get_user(current
->thread
.tm_tfhar
, &sc
->gp_regs
[PT_NIP
]);
415 /* get MSR separately, transfer the LE bit if doing signal return */
416 err
|= __get_user(msr
, &sc
->gp_regs
[PT_MSR
]);
417 /* pull in MSR TM from user context */
418 regs
->msr
= (regs
->msr
& ~MSR_TS_MASK
) | (msr
& MSR_TS_MASK
);
420 /* pull in MSR LE from user context */
421 regs
->msr
= (regs
->msr
& ~MSR_LE
) | (msr
& MSR_LE
);
423 /* The following non-GPR non-FPR non-VR state is also checkpointed: */
424 err
|= __get_user(regs
->ctr
, &tm_sc
->gp_regs
[PT_CTR
]);
425 err
|= __get_user(regs
->link
, &tm_sc
->gp_regs
[PT_LNK
]);
426 err
|= __get_user(regs
->xer
, &tm_sc
->gp_regs
[PT_XER
]);
427 err
|= __get_user(regs
->ccr
, &tm_sc
->gp_regs
[PT_CCR
]);
428 err
|= __get_user(current
->thread
.ckpt_regs
.ctr
,
429 &sc
->gp_regs
[PT_CTR
]);
430 err
|= __get_user(current
->thread
.ckpt_regs
.link
,
431 &sc
->gp_regs
[PT_LNK
]);
432 err
|= __get_user(current
->thread
.ckpt_regs
.xer
,
433 &sc
->gp_regs
[PT_XER
]);
434 err
|= __get_user(current
->thread
.ckpt_regs
.ccr
,
435 &sc
->gp_regs
[PT_CCR
]);
437 /* These regs are not checkpointed; they can go in 'regs'. */
438 err
|= __get_user(regs
->trap
, &sc
->gp_regs
[PT_TRAP
]);
439 err
|= __get_user(regs
->dar
, &sc
->gp_regs
[PT_DAR
]);
440 err
|= __get_user(regs
->dsisr
, &sc
->gp_regs
[PT_DSISR
]);
441 err
|= __get_user(regs
->result
, &sc
->gp_regs
[PT_RESULT
]);
444 * Do this before updating the thread state in
445 * current->thread.fpr/vr. That way, if we get preempted
446 * and another task grabs the FPU/Altivec, it won't be
447 * tempted to save the current CPU state into the thread_struct
448 * and corrupt what we are writing there.
450 discard_lazy_cpu_state();
453 * Force reload of FP/VEC.
454 * This has to be done before copying stuff into current->thread.fpr/vr
455 * for the reasons explained in the previous comment.
457 regs
->msr
&= ~(MSR_FP
| MSR_FE0
| MSR_FE1
| MSR_VEC
| MSR_VSX
);
459 #ifdef CONFIG_ALTIVEC
460 err
|= __get_user(v_regs
, &sc
->v_regs
);
461 err
|= __get_user(tm_v_regs
, &tm_sc
->v_regs
);
464 if (v_regs
&& !access_ok(VERIFY_READ
, v_regs
, 34 * sizeof(vector128
)))
466 if (tm_v_regs
&& !access_ok(VERIFY_READ
,
467 tm_v_regs
, 34 * sizeof(vector128
)))
469 /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
470 if (v_regs
!= NULL
&& tm_v_regs
!= NULL
&& (msr
& MSR_VEC
) != 0) {
471 err
|= __copy_from_user(current
->thread
.vr
, v_regs
,
472 33 * sizeof(vector128
));
473 err
|= __copy_from_user(current
->thread
.transact_vr
, tm_v_regs
,
474 33 * sizeof(vector128
));
476 else if (current
->thread
.used_vr
) {
477 memset(current
->thread
.vr
, 0, 33 * sizeof(vector128
));
478 memset(current
->thread
.transact_vr
, 0, 33 * sizeof(vector128
));
480 /* Always get VRSAVE back */
481 if (v_regs
!= NULL
&& tm_v_regs
!= NULL
) {
482 err
|= __get_user(current
->thread
.vrsave
,
483 (u32 __user
*)&v_regs
[33]);
484 err
|= __get_user(current
->thread
.transact_vrsave
,
485 (u32 __user
*)&tm_v_regs
[33]);
488 current
->thread
.vrsave
= 0;
489 current
->thread
.transact_vrsave
= 0;
491 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
492 mtspr(SPRN_VRSAVE
, current
->thread
.vrsave
);
493 #endif /* CONFIG_ALTIVEC */
494 /* restore floating point */
495 err
|= copy_fpr_from_user(current
, &sc
->fp_regs
);
496 err
|= copy_transact_fpr_from_user(current
, &tm_sc
->fp_regs
);
499 * Get additional VSX data. Update v_regs to point after the
500 * VMX data. Copy VSX low doubleword from userspace to local
501 * buffer for formatting, then into the taskstruct.
503 if (v_regs
&& ((msr
& MSR_VSX
) != 0)) {
504 v_regs
+= ELF_NVRREG
;
505 tm_v_regs
+= ELF_NVRREG
;
506 err
|= copy_vsx_from_user(current
, v_regs
);
507 err
|= copy_transact_vsx_from_user(current
, tm_v_regs
);
509 for (i
= 0; i
< 32 ; i
++) {
510 current
->thread
.fpr
[i
][TS_VSRLOWOFFSET
] = 0;
511 current
->thread
.transact_fpr
[i
][TS_VSRLOWOFFSET
] = 0;
516 /* This loads the checkpointed FP/VEC state, if used */
517 tm_recheckpoint(¤t
->thread
, msr
);
519 /* This loads the speculative FP/VEC state, if used */
521 do_load_up_transact_fpu(¤t
->thread
);
522 regs
->msr
|= (MSR_FP
| current
->thread
.fpexc_mode
);
524 #ifdef CONFIG_ALTIVEC
526 do_load_up_transact_altivec(¤t
->thread
);
527 regs
->msr
|= MSR_VEC
;
536 * Setup the trampoline code on the stack
538 static long setup_trampoline(unsigned int syscall
, unsigned int __user
*tramp
)
543 /* addi r1, r1, __SIGNAL_FRAMESIZE # Pop the dummy stackframe */
544 err
|= __put_user(0x38210000UL
| (__SIGNAL_FRAMESIZE
& 0xffff), &tramp
[0]);
545 /* li r0, __NR_[rt_]sigreturn| */
546 err
|= __put_user(0x38000000UL
| (syscall
& 0xffff), &tramp
[1]);
548 err
|= __put_user(0x44000002UL
, &tramp
[2]);
550 /* Minimal traceback info */
551 for (i
=TRAMP_TRACEBACK
; i
< TRAMP_SIZE
;i
++)
552 err
|= __put_user(0, &tramp
[i
]);
555 flush_icache_range((unsigned long) &tramp
[0],
556 (unsigned long) &tramp
[TRAMP_SIZE
]);
562 * Userspace code may pass a ucontext which doesn't include VSX added
563 * at the end. We need to check for this case.
565 #define UCONTEXTSIZEWITHOUTVSX \
566 (sizeof(struct ucontext) - 32*sizeof(long))
569 * Handle {get,set,swap}_context operations
571 int sys_swapcontext(struct ucontext __user
*old_ctx
,
572 struct ucontext __user
*new_ctx
,
573 long ctx_size
, long r6
, long r7
, long r8
, struct pt_regs
*regs
)
577 unsigned long new_msr
= 0;
578 int ctx_has_vsx_region
= 0;
581 get_user(new_msr
, &new_ctx
->uc_mcontext
.gp_regs
[PT_MSR
]))
584 * Check that the context is not smaller than the original
585 * size (with VMX but without VSX)
587 if (ctx_size
< UCONTEXTSIZEWITHOUTVSX
)
590 * If the new context state sets the MSR VSX bits but
591 * it doesn't provide VSX state.
593 if ((ctx_size
< sizeof(struct ucontext
)) &&
596 /* Does the context have enough room to store VSX data? */
597 if (ctx_size
>= sizeof(struct ucontext
))
598 ctx_has_vsx_region
= 1;
600 if (old_ctx
!= NULL
) {
601 if (!access_ok(VERIFY_WRITE
, old_ctx
, ctx_size
)
602 || setup_sigcontext(&old_ctx
->uc_mcontext
, regs
, 0, NULL
, 0,
604 || __copy_to_user(&old_ctx
->uc_sigmask
,
605 ¤t
->blocked
, sizeof(sigset_t
)))
610 if (!access_ok(VERIFY_READ
, new_ctx
, ctx_size
)
611 || __get_user(tmp
, (u8 __user
*) new_ctx
)
612 || __get_user(tmp
, (u8 __user
*) new_ctx
+ ctx_size
- 1))
616 * If we get a fault copying the context into the kernel's
617 * image of the user's registers, we can't just return -EFAULT
618 * because the user's registers will be corrupted. For instance
619 * the NIP value may have been updated but not some of the
620 * other registers. Given that we have done the access_ok
621 * and successfully read the first and last bytes of the region
622 * above, this should only happen in an out-of-memory situation
623 * or if another thread unmaps the region containing the context.
624 * We kill the task with a SIGSEGV in this situation.
627 if (__copy_from_user(&set
, &new_ctx
->uc_sigmask
, sizeof(set
)))
629 set_current_blocked(&set
);
630 if (restore_sigcontext(regs
, NULL
, 0, &new_ctx
->uc_mcontext
))
633 /* This returns like rt_sigreturn */
634 set_thread_flag(TIF_RESTOREALL
);
640 * Do a signal return; undo the signal stack.
643 int sys_rt_sigreturn(unsigned long r3
, unsigned long r4
, unsigned long r5
,
644 unsigned long r6
, unsigned long r7
, unsigned long r8
,
645 struct pt_regs
*regs
)
647 struct ucontext __user
*uc
= (struct ucontext __user
*)regs
->gpr
[1];
649 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
653 /* Always make any pending restarted system calls return -EINTR */
654 current_thread_info()->restart_block
.fn
= do_no_restart_syscall
;
656 if (!access_ok(VERIFY_READ
, uc
, sizeof(*uc
)))
659 if (__copy_from_user(&set
, &uc
->uc_sigmask
, sizeof(set
)))
661 set_current_blocked(&set
);
662 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
663 if (__get_user(msr
, &uc
->uc_mcontext
.gp_regs
[PT_MSR
]))
665 if (MSR_TM_ACTIVE(msr
)) {
666 /* We recheckpoint on return. */
667 struct ucontext __user
*uc_transact
;
668 if (__get_user(uc_transact
, &uc
->uc_link
))
670 if (restore_tm_sigcontexts(regs
, &uc
->uc_mcontext
,
671 &uc_transact
->uc_mcontext
))
675 /* Fall through, for non-TM restore */
677 if (restore_sigcontext(regs
, NULL
, 1, &uc
->uc_mcontext
))
680 if (restore_altstack(&uc
->uc_stack
))
683 set_thread_flag(TIF_RESTOREALL
);
688 printk("badframe in sys_rt_sigreturn, regs=%p uc=%p &uc->uc_mcontext=%p\n",
689 regs
, uc
, &uc
->uc_mcontext
);
691 if (show_unhandled_signals
)
692 printk_ratelimited(regs
->msr
& MSR_64BIT
? fmt64
: fmt32
,
693 current
->comm
, current
->pid
, "rt_sigreturn",
694 (long)uc
, regs
->nip
, regs
->link
);
696 force_sig(SIGSEGV
, current
);
700 int handle_rt_signal64(int signr
, struct k_sigaction
*ka
, siginfo_t
*info
,
701 sigset_t
*set
, struct pt_regs
*regs
)
703 /* Handler is *really* a pointer to the function descriptor for
704 * the signal routine. The first entry in the function
705 * descriptor is the entry address of signal and the second
706 * entry is the TOC value we need to use.
708 func_descr_t __user
*funct_desc_ptr
;
709 struct rt_sigframe __user
*frame
;
710 unsigned long newsp
= 0;
713 frame
= get_sigframe(ka
, get_tm_stackpointer(regs
), sizeof(*frame
), 0);
714 if (unlikely(frame
== NULL
))
717 err
|= __put_user(&frame
->info
, &frame
->pinfo
);
718 err
|= __put_user(&frame
->uc
, &frame
->puc
);
719 err
|= copy_siginfo_to_user(&frame
->info
, info
);
723 /* Create the ucontext. */
724 err
|= __put_user(0, &frame
->uc
.uc_flags
);
725 err
|= __save_altstack(&frame
->uc
.uc_stack
, regs
->gpr
[1]);
726 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
727 if (MSR_TM_ACTIVE(regs
->msr
)) {
728 /* The ucontext_t passed to userland points to the second
729 * ucontext_t (for transactional state) with its uc_link ptr.
731 err
|= __put_user(&frame
->uc_transact
, &frame
->uc
.uc_link
);
732 err
|= setup_tm_sigcontexts(&frame
->uc
.uc_mcontext
,
733 &frame
->uc_transact
.uc_mcontext
,
736 (unsigned long)ka
->sa
.sa_handler
);
740 err
|= __put_user(0, &frame
->uc
.uc_link
);
741 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, regs
, signr
,
742 NULL
, (unsigned long)ka
->sa
.sa_handler
,
745 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
749 /* Make sure signal handler doesn't get spurious FP exceptions */
750 current
->thread
.fpscr
.val
= 0;
751 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
752 /* Remove TM bits from thread's MSR. The MSR in the sigcontext
753 * just indicates to userland that we were doing a transaction, but we
754 * don't want to return in transactional state:
756 regs
->msr
&= ~MSR_TS_MASK
;
759 /* Set up to return from userspace. */
760 if (vdso64_rt_sigtramp
&& current
->mm
->context
.vdso_base
) {
761 regs
->link
= current
->mm
->context
.vdso_base
+ vdso64_rt_sigtramp
;
763 err
|= setup_trampoline(__NR_rt_sigreturn
, &frame
->tramp
[0]);
766 regs
->link
= (unsigned long) &frame
->tramp
[0];
768 funct_desc_ptr
= (func_descr_t __user
*) ka
->sa
.sa_handler
;
770 /* Allocate a dummy caller frame for the signal handler. */
771 newsp
= ((unsigned long)frame
) - __SIGNAL_FRAMESIZE
;
772 err
|= put_user(regs
->gpr
[1], (unsigned long __user
*)newsp
);
774 /* Set up "regs" so we "return" to the signal handler. */
775 err
|= get_user(regs
->nip
, &funct_desc_ptr
->entry
);
776 /* enter the signal handler in big-endian mode */
777 regs
->msr
&= ~MSR_LE
;
778 regs
->gpr
[1] = newsp
;
779 err
|= get_user(regs
->gpr
[2], &funct_desc_ptr
->toc
);
780 regs
->gpr
[3] = signr
;
782 if (ka
->sa
.sa_flags
& SA_SIGINFO
) {
783 err
|= get_user(regs
->gpr
[4], (unsigned long __user
*)&frame
->pinfo
);
784 err
|= get_user(regs
->gpr
[5], (unsigned long __user
*)&frame
->puc
);
785 regs
->gpr
[6] = (unsigned long) frame
;
787 regs
->gpr
[4] = (unsigned long)&frame
->uc
.uc_mcontext
;
796 printk("badframe in setup_rt_frame, regs=%p frame=%p newsp=%lx\n",
799 if (show_unhandled_signals
)
800 printk_ratelimited(regs
->msr
& MSR_64BIT
? fmt64
: fmt32
,
801 current
->comm
, current
->pid
, "setup_rt_frame",
802 (long)frame
, regs
->nip
, regs
->link
);
804 force_sigsegv(signr
, current
);
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