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15#include <linux/sched.h>
16#include <linux/mm.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/module.h>
27
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>
35#include <asm/vdso.h>
36
37#include "signal.h"
38
39#define DEBUG_SIG 0
40
41#define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
42#define FP_REGS_SIZE sizeof(elf_fpregset_t)
43
44#define TRAMP_TRACEBACK 3
45#define TRAMP_SIZE 6
46
47
48
49
50
51
52
53
54
55struct rt_sigframe {
56
57 struct ucontext uc;
58 unsigned long _unused[2];
59 unsigned int tramp[TRAMP_SIZE];
60 struct siginfo __user *pinfo;
61 void __user *puc;
62 struct siginfo info;
63
64 char abigap[288];
65} __attribute__ ((aligned (16)));
66
67static const char fmt32[] = KERN_INFO \
68 "%s[%d]: bad frame in %s: %08lx nip %08lx lr %08lx\n";
69static const char fmt64[] = KERN_INFO \
70 "%s[%d]: bad frame in %s: %016lx nip %016lx lr %016lx\n";
71
72
73
74
75
76static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
77 int signr, sigset_t *set, unsigned long handler,
78 int ctx_has_vsx_region)
79{
80
81
82
83
84
85
86
87
88#ifdef CONFIG_ALTIVEC
89 elf_vrreg_t __user *v_regs = (elf_vrreg_t __user *)(((unsigned long)sc->vmx_reserve + 15) & ~0xful);
90#endif
91 unsigned long msr = regs->msr;
92 long err = 0;
93
94 flush_fp_to_thread(current);
95
96#ifdef CONFIG_ALTIVEC
97 err |= __put_user(v_regs, &sc->v_regs);
98
99
100 if (current->thread.used_vr) {
101 flush_altivec_to_thread(current);
102
103 err |= __copy_to_user(v_regs, current->thread.vr, 33 * sizeof(vector128));
104
105
106
107 msr |= MSR_VEC;
108 }
109
110
111
112 err |= __put_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
113#else
114 err |= __put_user(0, &sc->v_regs);
115#endif
116 flush_fp_to_thread(current);
117
118 err |= copy_fpr_to_user(&sc->fp_regs, current);
119#ifdef CONFIG_VSX
120
121
122
123
124
125 if (current->thread.used_vsr && ctx_has_vsx_region) {
126 __giveup_vsx(current);
127 v_regs += ELF_NVRREG;
128 err |= copy_vsx_to_user(v_regs, current);
129
130
131
132 msr |= MSR_VSX;
133 }
134#endif
135 err |= __put_user(&sc->gp_regs, &sc->regs);
136 WARN_ON(!FULL_REGS(regs));
137 err |= __copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE);
138 err |= __put_user(msr, &sc->gp_regs[PT_MSR]);
139 err |= __put_user(signr, &sc->signal);
140 err |= __put_user(handler, &sc->handler);
141 if (set != NULL)
142 err |= __put_user(set->sig[0], &sc->oldmask);
143
144 return err;
145}
146
147
148
149
150
151static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
152 struct sigcontext __user *sc)
153{
154#ifdef CONFIG_ALTIVEC
155 elf_vrreg_t __user *v_regs;
156#endif
157 unsigned long err = 0;
158 unsigned long save_r13 = 0;
159 unsigned long msr;
160#ifdef CONFIG_VSX
161 int i;
162#endif
163
164
165 if (!sig)
166 save_r13 = regs->gpr[13];
167
168
169 err |= __copy_from_user(regs->gpr, sc->gp_regs, sizeof(regs->gpr));
170 err |= __get_user(regs->nip, &sc->gp_regs[PT_NIP]);
171
172 err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
173 if (sig)
174 regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
175 err |= __get_user(regs->orig_gpr3, &sc->gp_regs[PT_ORIG_R3]);
176 err |= __get_user(regs->ctr, &sc->gp_regs[PT_CTR]);
177 err |= __get_user(regs->link, &sc->gp_regs[PT_LNK]);
178 err |= __get_user(regs->xer, &sc->gp_regs[PT_XER]);
179 err |= __get_user(regs->ccr, &sc->gp_regs[PT_CCR]);
180
181 regs->trap = 0;
182 err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]);
183 err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]);
184 err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]);
185
186 if (!sig)
187 regs->gpr[13] = save_r13;
188 if (set != NULL)
189 err |= __get_user(set->sig[0], &sc->oldmask);
190
191
192
193
194
195
196
197
198 discard_lazy_cpu_state();
199
200
201
202
203
204
205 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX);
206
207#ifdef CONFIG_ALTIVEC
208 err |= __get_user(v_regs, &sc->v_regs);
209 if (err)
210 return err;
211 if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
212 return -EFAULT;
213
214 if (v_regs != 0 && (msr & MSR_VEC) != 0)
215 err |= __copy_from_user(current->thread.vr, v_regs,
216 33 * sizeof(vector128));
217 else if (current->thread.used_vr)
218 memset(current->thread.vr, 0, 33 * sizeof(vector128));
219
220 if (v_regs != 0)
221 err |= __get_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
222 else
223 current->thread.vrsave = 0;
224#endif
225
226 err |= copy_fpr_from_user(current, &sc->fp_regs);
227#ifdef CONFIG_VSX
228
229
230
231
232
233 v_regs += ELF_NVRREG;
234 if ((msr & MSR_VSX) != 0)
235 err |= copy_vsx_from_user(current, v_regs);
236 else
237 for (i = 0; i < 32 ; i++)
238 current->thread.fpr[i][TS_VSRLOWOFFSET] = 0;
239#endif
240 return err;
241}
242
243
244
245
246static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp)
247{
248 int i;
249 long err = 0;
250
251
252 err |= __put_user(0x38210000UL | (__SIGNAL_FRAMESIZE & 0xffff), &tramp[0]);
253
254 err |= __put_user(0x38000000UL | (syscall & 0xffff), &tramp[1]);
255
256 err |= __put_user(0x44000002UL, &tramp[2]);
257
258
259 for (i=TRAMP_TRACEBACK; i < TRAMP_SIZE ;i++)
260 err |= __put_user(0, &tramp[i]);
261
262 if (!err)
263 flush_icache_range((unsigned long) &tramp[0],
264 (unsigned long) &tramp[TRAMP_SIZE]);
265
266 return err;
267}
268
269
270
271
272
273#define UCONTEXTSIZEWITHOUTVSX \
274 (sizeof(struct ucontext) - 32*sizeof(long))
275
276
277
278
279int sys_swapcontext(struct ucontext __user *old_ctx,
280 struct ucontext __user *new_ctx,
281 long ctx_size, long r6, long r7, long r8, struct pt_regs *regs)
282{
283 unsigned char tmp;
284 sigset_t set;
285 unsigned long new_msr = 0;
286 int ctx_has_vsx_region = 0;
287
288 if (new_ctx &&
289 get_user(new_msr, &new_ctx->uc_mcontext.gp_regs[PT_MSR]))
290 return -EFAULT;
291
292
293
294
295 if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
296 return -EINVAL;
297
298
299
300
301 if ((ctx_size < sizeof(struct ucontext)) &&
302 (new_msr & MSR_VSX))
303 return -EINVAL;
304
305 if (ctx_size >= sizeof(struct ucontext))
306 ctx_has_vsx_region = 1;
307
308 if (old_ctx != NULL) {
309 if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
310 || setup_sigcontext(&old_ctx->uc_mcontext, regs, 0, NULL, 0,
311 ctx_has_vsx_region)
312 || __copy_to_user(&old_ctx->uc_sigmask,
313 ¤t->blocked, sizeof(sigset_t)))
314 return -EFAULT;
315 }
316 if (new_ctx == NULL)
317 return 0;
318 if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
319 || __get_user(tmp, (u8 __user *) new_ctx)
320 || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
321 return -EFAULT;
322
323
324
325
326
327
328
329
330
331
332
333
334
335 if (__copy_from_user(&set, &new_ctx->uc_sigmask, sizeof(set)))
336 do_exit(SIGSEGV);
337 restore_sigmask(&set);
338 if (restore_sigcontext(regs, NULL, 0, &new_ctx->uc_mcontext))
339 do_exit(SIGSEGV);
340
341
342 set_thread_flag(TIF_RESTOREALL);
343 return 0;
344}
345
346
347
348
349
350
351int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
352 unsigned long r6, unsigned long r7, unsigned long r8,
353 struct pt_regs *regs)
354{
355 struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1];
356 sigset_t set;
357
358
359 current_thread_info()->restart_block.fn = do_no_restart_syscall;
360
361 if (!access_ok(VERIFY_READ, uc, sizeof(*uc)))
362 goto badframe;
363
364 if (__copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
365 goto badframe;
366 restore_sigmask(&set);
367 if (restore_sigcontext(regs, NULL, 1, &uc->uc_mcontext))
368 goto badframe;
369
370
371
372
373 do_sigaltstack(&uc->uc_stack, NULL, regs->gpr[1]);
374
375 set_thread_flag(TIF_RESTOREALL);
376 return 0;
377
378badframe:
379#if DEBUG_SIG
380 printk("badframe in sys_rt_sigreturn, regs=%p uc=%p &uc->uc_mcontext=%p\n",
381 regs, uc, &uc->uc_mcontext);
382#endif
383 if (show_unhandled_signals && printk_ratelimit())
384 printk(regs->msr & MSR_SF ? fmt64 : fmt32,
385 current->comm, current->pid, "rt_sigreturn",
386 (long)uc, regs->nip, regs->link);
387
388 force_sig(SIGSEGV, current);
389 return 0;
390}
391
392int handle_rt_signal64(int signr, struct k_sigaction *ka, siginfo_t *info,
393 sigset_t *set, struct pt_regs *regs)
394{
395
396
397
398
399
400 func_descr_t __user *funct_desc_ptr;
401 struct rt_sigframe __user *frame;
402 unsigned long newsp = 0;
403 long err = 0;
404
405 frame = get_sigframe(ka, regs, sizeof(*frame), 0);
406 if (unlikely(frame == NULL))
407 goto badframe;
408
409 err |= __put_user(&frame->info, &frame->pinfo);
410 err |= __put_user(&frame->uc, &frame->puc);
411 err |= copy_siginfo_to_user(&frame->info, info);
412 if (err)
413 goto badframe;
414
415
416 err |= __put_user(0, &frame->uc.uc_flags);
417 err |= __put_user(0, &frame->uc.uc_link);
418 err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
419 err |= __put_user(sas_ss_flags(regs->gpr[1]),
420 &frame->uc.uc_stack.ss_flags);
421 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
422 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, signr, NULL,
423 (unsigned long)ka->sa.sa_handler, 1);
424 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
425 if (err)
426 goto badframe;
427
428
429 current->thread.fpscr.val = 0;
430
431
432 if (vdso64_rt_sigtramp && current->mm->context.vdso_base) {
433 regs->link = current->mm->context.vdso_base + vdso64_rt_sigtramp;
434 } else {
435 err |= setup_trampoline(__NR_rt_sigreturn, &frame->tramp[0]);
436 if (err)
437 goto badframe;
438 regs->link = (unsigned long) &frame->tramp[0];
439 }
440 funct_desc_ptr = (func_descr_t __user *) ka->sa.sa_handler;
441
442
443 newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
444 err |= put_user(regs->gpr[1], (unsigned long __user *)newsp);
445
446
447 err |= get_user(regs->nip, &funct_desc_ptr->entry);
448
449 regs->msr &= ~MSR_LE;
450 regs->gpr[1] = newsp;
451 err |= get_user(regs->gpr[2], &funct_desc_ptr->toc);
452 regs->gpr[3] = signr;
453 regs->result = 0;
454 if (ka->sa.sa_flags & SA_SIGINFO) {
455 err |= get_user(regs->gpr[4], (unsigned long __user *)&frame->pinfo);
456 err |= get_user(regs->gpr[5], (unsigned long __user *)&frame->puc);
457 regs->gpr[6] = (unsigned long) frame;
458 } else {
459 regs->gpr[4] = (unsigned long)&frame->uc.uc_mcontext;
460 }
461 if (err)
462 goto badframe;
463
464 return 1;
465
466badframe:
467#if DEBUG_SIG
468 printk("badframe in setup_rt_frame, regs=%p frame=%p newsp=%lx\n",
469 regs, frame, newsp);
470#endif
471 if (show_unhandled_signals && printk_ratelimit())
472 printk(regs->msr & MSR_SF ? fmt64 : fmt32,
473 current->comm, current->pid, "setup_rt_frame",
474 (long)frame, regs->nip, regs->link);
475
476 force_sigsegv(signr, current);
477 return 0;
478}
479