signal_64.c 25 KB

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  1. /*
  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. #include <linux/sched.h>
  15. #include <linux/mm.h>
  16. #include <linux/smp.h>
  17. #include <linux/kernel.h>
  18. #include <linux/signal.h>
  19. #include <linux/errno.h>
  20. #include <linux/wait.h>
  21. #include <linux/unistd.h>
  22. #include <linux/stddef.h>
  23. #include <linux/elf.h>
  24. #include <linux/ptrace.h>
  25. #include <linux/ratelimit.h>
  26. #include <asm/sigcontext.h>
  27. #include <asm/ucontext.h>
  28. #include <asm/uaccess.h>
  29. #include <asm/pgtable.h>
  30. #include <asm/unistd.h>
  31. #include <asm/cacheflush.h>
  32. #include <asm/syscalls.h>
  33. #include <asm/vdso.h>
  34. #include <asm/switch_to.h>
  35. #include <asm/tm.h>
  36. #include "signal.h"
  37. #define DEBUG_SIG 0
  38. #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
  39. #define FP_REGS_SIZE sizeof(elf_fpregset_t)
  40. #define TRAMP_TRACEBACK 3
  41. #define TRAMP_SIZE 6
  42. /*
  43. * When we have signals to deliver, we set up on the user stack,
  44. * going down from the original stack pointer:
  45. * 1) a rt_sigframe struct which contains the ucontext
  46. * 2) a gap of __SIGNAL_FRAMESIZE bytes which acts as a dummy caller
  47. * frame for the signal handler.
  48. */
  49. struct rt_sigframe {
  50. /* sys_rt_sigreturn requires the ucontext be the first field */
  51. struct ucontext uc;
  52. #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
  53. struct ucontext uc_transact;
  54. #endif
  55. unsigned long _unused[2];
  56. unsigned int tramp[TRAMP_SIZE];
  57. struct siginfo __user *pinfo;
  58. void __user *puc;
  59. struct siginfo info;
  60. /* 64 bit ABI allows for 288 bytes below sp before decrementing it. */
  61. char abigap[288];
  62. } __attribute__ ((aligned (16)));
  63. static const char fmt32[] = KERN_INFO \
  64. "%s[%d]: bad frame in %s: %08lx nip %08lx lr %08lx\n";
  65. static const char fmt64[] = KERN_INFO \
  66. "%s[%d]: bad frame in %s: %016lx nip %016lx lr %016lx\n";
  67. /*
  68. * Set up the sigcontext for the signal frame.
  69. */
  70. static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
  71. int signr, sigset_t *set, unsigned long handler,
  72. int ctx_has_vsx_region)
  73. {
  74. /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
  75. * process never used altivec yet (MSR_VEC is zero in pt_regs of
  76. * the context). This is very important because we must ensure we
  77. * don't lose the VRSAVE content that may have been set prior to
  78. * the process doing its first vector operation
  79. * Userland shall check AT_HWCAP to know whether it can rely on the
  80. * v_regs pointer or not
  81. */
  82. #ifdef CONFIG_ALTIVEC
  83. elf_vrreg_t __user *v_regs = (elf_vrreg_t __user *)(((unsigned long)sc->vmx_reserve + 15) & ~0xful);
  84. #endif
  85. unsigned long msr = regs->msr;
  86. long err = 0;
  87. flush_fp_to_thread(current);
  88. #ifdef CONFIG_ALTIVEC
  89. err |= __put_user(v_regs, &sc->v_regs);
  90. /* save altivec registers */
  91. if (current->thread.used_vr) {
  92. flush_altivec_to_thread(current);
  93. /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
  94. err |= __copy_to_user(v_regs, current->thread.vr, 33 * sizeof(vector128));
  95. /* set MSR_VEC in the MSR value in the frame to indicate that sc->v_reg)
  96. * contains valid data.
  97. */
  98. msr |= MSR_VEC;
  99. }
  100. /* We always copy to/from vrsave, it's 0 if we don't have or don't
  101. * use altivec.
  102. */
  103. err |= __put_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
  104. #else /* CONFIG_ALTIVEC */
  105. err |= __put_user(0, &sc->v_regs);
  106. #endif /* CONFIG_ALTIVEC */
  107. flush_fp_to_thread(current);
  108. /* copy fpr regs and fpscr */
  109. err |= copy_fpr_to_user(&sc->fp_regs, current);
  110. #ifdef CONFIG_VSX
  111. /*
  112. * Copy VSX low doubleword to local buffer for formatting,
  113. * then out to userspace. Update v_regs to point after the
  114. * VMX data.
  115. */
  116. if (current->thread.used_vsr && ctx_has_vsx_region) {
  117. __giveup_vsx(current);
  118. v_regs += ELF_NVRREG;
  119. err |= copy_vsx_to_user(v_regs, current);
  120. /* set MSR_VSX in the MSR value in the frame to
  121. * indicate that sc->vs_reg) contains valid data.
  122. */
  123. msr |= MSR_VSX;
  124. }
  125. #endif /* CONFIG_VSX */
  126. err |= __put_user(&sc->gp_regs, &sc->regs);
  127. WARN_ON(!FULL_REGS(regs));
  128. err |= __copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE);
  129. err |= __put_user(msr, &sc->gp_regs[PT_MSR]);
  130. err |= __put_user(signr, &sc->signal);
  131. err |= __put_user(handler, &sc->handler);
  132. if (set != NULL)
  133. err |= __put_user(set->sig[0], &sc->oldmask);
  134. return err;
  135. }
  136. #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
  137. /*
  138. * As above, but Transactional Memory is in use, so deliver sigcontexts
  139. * containing checkpointed and transactional register states.
  140. *
  141. * To do this, we treclaim (done before entering here) to gather both sets of
  142. * registers and set up the 'normal' sigcontext registers with rolled-back
  143. * register values such that a simple signal handler sees a correct
  144. * checkpointed register state. If interested, a TM-aware sighandler can
  145. * examine the transactional registers in the 2nd sigcontext to determine the
  146. * real origin of the signal.
  147. */
  148. static long setup_tm_sigcontexts(struct sigcontext __user *sc,
  149. struct sigcontext __user *tm_sc,
  150. struct pt_regs *regs,
  151. int signr, sigset_t *set, unsigned long handler)
  152. {
  153. /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
  154. * process never used altivec yet (MSR_VEC is zero in pt_regs of
  155. * the context). This is very important because we must ensure we
  156. * don't lose the VRSAVE content that may have been set prior to
  157. * the process doing its first vector operation
  158. * Userland shall check AT_HWCAP to know wether it can rely on the
  159. * v_regs pointer or not.
  160. */
  161. #ifdef CONFIG_ALTIVEC
  162. elf_vrreg_t __user *v_regs = (elf_vrreg_t __user *)
  163. (((unsigned long)sc->vmx_reserve + 15) & ~0xful);
  164. elf_vrreg_t __user *tm_v_regs = (elf_vrreg_t __user *)
  165. (((unsigned long)tm_sc->vmx_reserve + 15) & ~0xful);
  166. #endif
  167. unsigned long msr = regs->msr;
  168. long err = 0;
  169. BUG_ON(!MSR_TM_ACTIVE(regs->msr));
  170. flush_fp_to_thread(current);
  171. #ifdef CONFIG_ALTIVEC
  172. err |= __put_user(v_regs, &sc->v_regs);
  173. err |= __put_user(tm_v_regs, &tm_sc->v_regs);
  174. /* save altivec registers */
  175. if (current->thread.used_vr) {
  176. flush_altivec_to_thread(current);
  177. /* Copy 33 vec registers (vr0..31 and vscr) to the stack */
  178. err |= __copy_to_user(v_regs, current->thread.vr,
  179. 33 * sizeof(vector128));
  180. /* If VEC was enabled there are transactional VRs valid too,
  181. * else they're a copy of the checkpointed VRs.
  182. */
  183. if (msr & MSR_VEC)
  184. err |= __copy_to_user(tm_v_regs,
  185. current->thread.transact_vr,
  186. 33 * sizeof(vector128));
  187. else
  188. err |= __copy_to_user(tm_v_regs,
  189. current->thread.vr,
  190. 33 * sizeof(vector128));
  191. /* set MSR_VEC in the MSR value in the frame to indicate
  192. * that sc->v_reg contains valid data.
  193. */
  194. msr |= MSR_VEC;
  195. }
  196. /* We always copy to/from vrsave, it's 0 if we don't have or don't
  197. * use altivec.
  198. */
  199. err |= __put_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
  200. if (msr & MSR_VEC)
  201. err |= __put_user(current->thread.transact_vrsave,
  202. (u32 __user *)&tm_v_regs[33]);
  203. else
  204. err |= __put_user(current->thread.vrsave,
  205. (u32 __user *)&tm_v_regs[33]);
  206. #else /* CONFIG_ALTIVEC */
  207. err |= __put_user(0, &sc->v_regs);
  208. err |= __put_user(0, &tm_sc->v_regs);
  209. #endif /* CONFIG_ALTIVEC */
  210. /* copy fpr regs and fpscr */
  211. err |= copy_fpr_to_user(&sc->fp_regs, current);
  212. if (msr & MSR_FP)
  213. err |= copy_transact_fpr_to_user(&tm_sc->fp_regs, current);
  214. else
  215. err |= copy_fpr_to_user(&tm_sc->fp_regs, current);
  216. #ifdef CONFIG_VSX
  217. /*
  218. * Copy VSX low doubleword to local buffer for formatting,
  219. * then out to userspace. Update v_regs to point after the
  220. * VMX data.
  221. */
  222. if (current->thread.used_vsr) {
  223. __giveup_vsx(current);
  224. v_regs += ELF_NVRREG;
  225. tm_v_regs += ELF_NVRREG;
  226. err |= copy_vsx_to_user(v_regs, current);
  227. if (msr & MSR_VSX)
  228. err |= copy_transact_vsx_to_user(tm_v_regs, current);
  229. else
  230. err |= copy_vsx_to_user(tm_v_regs, current);
  231. /* set MSR_VSX in the MSR value in the frame to
  232. * indicate that sc->vs_reg) contains valid data.
  233. */
  234. msr |= MSR_VSX;
  235. }
  236. #endif /* CONFIG_VSX */
  237. err |= __put_user(&sc->gp_regs, &sc->regs);
  238. err |= __put_user(&tm_sc->gp_regs, &tm_sc->regs);
  239. WARN_ON(!FULL_REGS(regs));
  240. err |= __copy_to_user(&tm_sc->gp_regs, regs, GP_REGS_SIZE);
  241. err |= __copy_to_user(&sc->gp_regs,
  242. &current->thread.ckpt_regs, GP_REGS_SIZE);
  243. err |= __put_user(msr, &tm_sc->gp_regs[PT_MSR]);
  244. err |= __put_user(msr, &sc->gp_regs[PT_MSR]);
  245. err |= __put_user(signr, &sc->signal);
  246. err |= __put_user(handler, &sc->handler);
  247. if (set != NULL)
  248. err |= __put_user(set->sig[0], &sc->oldmask);
  249. return err;
  250. }
  251. #endif
  252. /*
  253. * Restore the sigcontext from the signal frame.
  254. */
  255. static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
  256. struct sigcontext __user *sc)
  257. {
  258. #ifdef CONFIG_ALTIVEC
  259. elf_vrreg_t __user *v_regs;
  260. #endif
  261. unsigned long err = 0;
  262. unsigned long save_r13 = 0;
  263. unsigned long msr;
  264. #ifdef CONFIG_VSX
  265. int i;
  266. #endif
  267. /* If this is not a signal return, we preserve the TLS in r13 */
  268. if (!sig)
  269. save_r13 = regs->gpr[13];
  270. /* copy the GPRs */
  271. err |= __copy_from_user(regs->gpr, sc->gp_regs, sizeof(regs->gpr));
  272. err |= __get_user(regs->nip, &sc->gp_regs[PT_NIP]);
  273. /* get MSR separately, transfer the LE bit if doing signal return */
  274. err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
  275. if (sig)
  276. regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
  277. err |= __get_user(regs->orig_gpr3, &sc->gp_regs[PT_ORIG_R3]);
  278. err |= __get_user(regs->ctr, &sc->gp_regs[PT_CTR]);
  279. err |= __get_user(regs->link, &sc->gp_regs[PT_LNK]);
  280. err |= __get_user(regs->xer, &sc->gp_regs[PT_XER]);
  281. err |= __get_user(regs->ccr, &sc->gp_regs[PT_CCR]);
  282. /* skip SOFTE */
  283. regs->trap = 0;
  284. err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]);
  285. err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]);
  286. err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]);
  287. if (!sig)
  288. regs->gpr[13] = save_r13;
  289. if (set != NULL)
  290. err |= __get_user(set->sig[0], &sc->oldmask);
  291. /*
  292. * Do this before updating the thread state in
  293. * current->thread.fpr/vr. That way, if we get preempted
  294. * and another task grabs the FPU/Altivec, it won't be
  295. * tempted to save the current CPU state into the thread_struct
  296. * and corrupt what we are writing there.
  297. */
  298. discard_lazy_cpu_state();
  299. /*
  300. * Force reload of FP/VEC.
  301. * This has to be done before copying stuff into current->thread.fpr/vr
  302. * for the reasons explained in the previous comment.
  303. */
  304. regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX);
  305. #ifdef CONFIG_ALTIVEC
  306. err |= __get_user(v_regs, &sc->v_regs);
  307. if (err)
  308. return err;
  309. if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
  310. return -EFAULT;
  311. /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
  312. if (v_regs != 0 && (msr & MSR_VEC) != 0)
  313. err |= __copy_from_user(current->thread.vr, v_regs,
  314. 33 * sizeof(vector128));
  315. else if (current->thread.used_vr)
  316. memset(current->thread.vr, 0, 33 * sizeof(vector128));
  317. /* Always get VRSAVE back */
  318. if (v_regs != 0)
  319. err |= __get_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
  320. else
  321. current->thread.vrsave = 0;
  322. #endif /* CONFIG_ALTIVEC */
  323. /* restore floating point */
  324. err |= copy_fpr_from_user(current, &sc->fp_regs);
  325. #ifdef CONFIG_VSX
  326. /*
  327. * Get additional VSX data. Update v_regs to point after the
  328. * VMX data. Copy VSX low doubleword from userspace to local
  329. * buffer for formatting, then into the taskstruct.
  330. */
  331. v_regs += ELF_NVRREG;
  332. if ((msr & MSR_VSX) != 0)
  333. err |= copy_vsx_from_user(current, v_regs);
  334. else
  335. for (i = 0; i < 32 ; i++)
  336. current->thread.fpr[i][TS_VSRLOWOFFSET] = 0;
  337. #endif
  338. return err;
  339. }
  340. #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
  341. /*
  342. * Restore the two sigcontexts from the frame of a transactional processes.
  343. */
  344. static long restore_tm_sigcontexts(struct pt_regs *regs,
  345. struct sigcontext __user *sc,
  346. struct sigcontext __user *tm_sc)
  347. {
  348. #ifdef CONFIG_ALTIVEC
  349. elf_vrreg_t __user *v_regs, *tm_v_regs;
  350. #endif
  351. unsigned long err = 0;
  352. unsigned long msr;
  353. #ifdef CONFIG_VSX
  354. int i;
  355. #endif
  356. /* copy the GPRs */
  357. err |= __copy_from_user(regs->gpr, tm_sc->gp_regs, sizeof(regs->gpr));
  358. err |= __copy_from_user(&current->thread.ckpt_regs, sc->gp_regs,
  359. sizeof(regs->gpr));
  360. /*
  361. * TFHAR is restored from the checkpointed 'wound-back' ucontext's NIP.
  362. * TEXASR was set by the signal delivery reclaim, as was TFIAR.
  363. * Users doing anything abhorrent like thread-switching w/ signals for
  364. * TM-Suspended code will have to back TEXASR/TFIAR up themselves.
  365. * For the case of getting a signal and simply returning from it,
  366. * we don't need to re-copy them here.
  367. */
  368. err |= __get_user(regs->nip, &tm_sc->gp_regs[PT_NIP]);
  369. err |= __get_user(current->thread.tm_tfhar, &sc->gp_regs[PT_NIP]);
  370. /* get MSR separately, transfer the LE bit if doing signal return */
  371. err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
  372. /* pull in MSR TM from user context */
  373. regs->msr = (regs->msr & ~MSR_TS_MASK) | (msr & MSR_TS_MASK);
  374. /* pull in MSR LE from user context */
  375. regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
  376. /* The following non-GPR non-FPR non-VR state is also checkpointed: */
  377. err |= __get_user(regs->ctr, &tm_sc->gp_regs[PT_CTR]);
  378. err |= __get_user(regs->link, &tm_sc->gp_regs[PT_LNK]);
  379. err |= __get_user(regs->xer, &tm_sc->gp_regs[PT_XER]);
  380. err |= __get_user(regs->ccr, &tm_sc->gp_regs[PT_CCR]);
  381. err |= __get_user(current->thread.ckpt_regs.ctr,
  382. &sc->gp_regs[PT_CTR]);
  383. err |= __get_user(current->thread.ckpt_regs.link,
  384. &sc->gp_regs[PT_LNK]);
  385. err |= __get_user(current->thread.ckpt_regs.xer,
  386. &sc->gp_regs[PT_XER]);
  387. err |= __get_user(current->thread.ckpt_regs.ccr,
  388. &sc->gp_regs[PT_CCR]);
  389. /* These regs are not checkpointed; they can go in 'regs'. */
  390. err |= __get_user(regs->trap, &sc->gp_regs[PT_TRAP]);
  391. err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]);
  392. err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]);
  393. err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]);
  394. /*
  395. * Do this before updating the thread state in
  396. * current->thread.fpr/vr. That way, if we get preempted
  397. * and another task grabs the FPU/Altivec, it won't be
  398. * tempted to save the current CPU state into the thread_struct
  399. * and corrupt what we are writing there.
  400. */
  401. discard_lazy_cpu_state();
  402. /*
  403. * Force reload of FP/VEC.
  404. * This has to be done before copying stuff into current->thread.fpr/vr
  405. * for the reasons explained in the previous comment.
  406. */
  407. regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX);
  408. #ifdef CONFIG_ALTIVEC
  409. err |= __get_user(v_regs, &sc->v_regs);
  410. err |= __get_user(tm_v_regs, &tm_sc->v_regs);
  411. if (err)
  412. return err;
  413. if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
  414. return -EFAULT;
  415. if (tm_v_regs && !access_ok(VERIFY_READ,
  416. tm_v_regs, 34 * sizeof(vector128)))
  417. return -EFAULT;
  418. /* Copy 33 vec registers (vr0..31 and vscr) from the stack */
  419. if (v_regs != 0 && tm_v_regs != 0 && (msr & MSR_VEC) != 0) {
  420. err |= __copy_from_user(current->thread.vr, v_regs,
  421. 33 * sizeof(vector128));
  422. err |= __copy_from_user(current->thread.transact_vr, tm_v_regs,
  423. 33 * sizeof(vector128));
  424. }
  425. else if (current->thread.used_vr) {
  426. memset(current->thread.vr, 0, 33 * sizeof(vector128));
  427. memset(current->thread.transact_vr, 0, 33 * sizeof(vector128));
  428. }
  429. /* Always get VRSAVE back */
  430. if (v_regs != 0 && tm_v_regs != 0) {
  431. err |= __get_user(current->thread.vrsave,
  432. (u32 __user *)&v_regs[33]);
  433. err |= __get_user(current->thread.transact_vrsave,
  434. (u32 __user *)&tm_v_regs[33]);
  435. }
  436. else {
  437. current->thread.vrsave = 0;
  438. current->thread.transact_vrsave = 0;
  439. }
  440. #endif /* CONFIG_ALTIVEC */
  441. /* restore floating point */
  442. err |= copy_fpr_from_user(current, &sc->fp_regs);
  443. err |= copy_transact_fpr_from_user(current, &tm_sc->fp_regs);
  444. #ifdef CONFIG_VSX
  445. /*
  446. * Get additional VSX data. Update v_regs to point after the
  447. * VMX data. Copy VSX low doubleword from userspace to local
  448. * buffer for formatting, then into the taskstruct.
  449. */
  450. if (v_regs && ((msr & MSR_VSX) != 0)) {
  451. v_regs += ELF_NVRREG;
  452. tm_v_regs += ELF_NVRREG;
  453. err |= copy_vsx_from_user(current, v_regs);
  454. err |= copy_transact_vsx_from_user(current, tm_v_regs);
  455. } else {
  456. for (i = 0; i < 32 ; i++) {
  457. current->thread.fpr[i][TS_VSRLOWOFFSET] = 0;
  458. current->thread.transact_fpr[i][TS_VSRLOWOFFSET] = 0;
  459. }
  460. }
  461. #endif
  462. tm_enable();
  463. /* This loads the checkpointed FP/VEC state, if used */
  464. tm_recheckpoint(&current->thread, msr);
  465. /* This loads the speculative FP/VEC state, if used */
  466. if (msr & MSR_FP) {
  467. do_load_up_transact_fpu(&current->thread);
  468. regs->msr |= (MSR_FP | current->thread.fpexc_mode);
  469. }
  470. #ifdef CONFIG_ALTIVEC
  471. if (msr & MSR_VEC) {
  472. do_load_up_transact_altivec(&current->thread);
  473. regs->msr |= MSR_VEC;
  474. }
  475. #endif
  476. return err;
  477. }
  478. #endif
  479. /*
  480. * Setup the trampoline code on the stack
  481. */
  482. static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp)
  483. {
  484. int i;
  485. long err = 0;
  486. /* addi r1, r1, __SIGNAL_FRAMESIZE # Pop the dummy stackframe */
  487. err |= __put_user(0x38210000UL | (__SIGNAL_FRAMESIZE & 0xffff), &tramp[0]);
  488. /* li r0, __NR_[rt_]sigreturn| */
  489. err |= __put_user(0x38000000UL | (syscall & 0xffff), &tramp[1]);
  490. /* sc */
  491. err |= __put_user(0x44000002UL, &tramp[2]);
  492. /* Minimal traceback info */
  493. for (i=TRAMP_TRACEBACK; i < TRAMP_SIZE ;i++)
  494. err |= __put_user(0, &tramp[i]);
  495. if (!err)
  496. flush_icache_range((unsigned long) &tramp[0],
  497. (unsigned long) &tramp[TRAMP_SIZE]);
  498. return err;
  499. }
  500. /*
  501. * Userspace code may pass a ucontext which doesn't include VSX added
  502. * at the end. We need to check for this case.
  503. */
  504. #define UCONTEXTSIZEWITHOUTVSX \
  505. (sizeof(struct ucontext) - 32*sizeof(long))
  506. /*
  507. * Handle {get,set,swap}_context operations
  508. */
  509. int sys_swapcontext(struct ucontext __user *old_ctx,
  510. struct ucontext __user *new_ctx,
  511. long ctx_size, long r6, long r7, long r8, struct pt_regs *regs)
  512. {
  513. unsigned char tmp;
  514. sigset_t set;
  515. unsigned long new_msr = 0;
  516. int ctx_has_vsx_region = 0;
  517. if (new_ctx &&
  518. get_user(new_msr, &new_ctx->uc_mcontext.gp_regs[PT_MSR]))
  519. return -EFAULT;
  520. /*
  521. * Check that the context is not smaller than the original
  522. * size (with VMX but without VSX)
  523. */
  524. if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
  525. return -EINVAL;
  526. /*
  527. * If the new context state sets the MSR VSX bits but
  528. * it doesn't provide VSX state.
  529. */
  530. if ((ctx_size < sizeof(struct ucontext)) &&
  531. (new_msr & MSR_VSX))
  532. return -EINVAL;
  533. /* Does the context have enough room to store VSX data? */
  534. if (ctx_size >= sizeof(struct ucontext))
  535. ctx_has_vsx_region = 1;
  536. if (old_ctx != NULL) {
  537. if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
  538. || setup_sigcontext(&old_ctx->uc_mcontext, regs, 0, NULL, 0,
  539. ctx_has_vsx_region)
  540. || __copy_to_user(&old_ctx->uc_sigmask,
  541. &current->blocked, sizeof(sigset_t)))
  542. return -EFAULT;
  543. }
  544. if (new_ctx == NULL)
  545. return 0;
  546. if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
  547. || __get_user(tmp, (u8 __user *) new_ctx)
  548. || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
  549. return -EFAULT;
  550. /*
  551. * If we get a fault copying the context into the kernel's
  552. * image of the user's registers, we can't just return -EFAULT
  553. * because the user's registers will be corrupted. For instance
  554. * the NIP value may have been updated but not some of the
  555. * other registers. Given that we have done the access_ok
  556. * and successfully read the first and last bytes of the region
  557. * above, this should only happen in an out-of-memory situation
  558. * or if another thread unmaps the region containing the context.
  559. * We kill the task with a SIGSEGV in this situation.
  560. */
  561. if (__copy_from_user(&set, &new_ctx->uc_sigmask, sizeof(set)))
  562. do_exit(SIGSEGV);
  563. set_current_blocked(&set);
  564. if (restore_sigcontext(regs, NULL, 0, &new_ctx->uc_mcontext))
  565. do_exit(SIGSEGV);
  566. /* This returns like rt_sigreturn */
  567. set_thread_flag(TIF_RESTOREALL);
  568. return 0;
  569. }
  570. /*
  571. * Do a signal return; undo the signal stack.
  572. */
  573. int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
  574. unsigned long r6, unsigned long r7, unsigned long r8,
  575. struct pt_regs *regs)
  576. {
  577. struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1];
  578. sigset_t set;
  579. #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
  580. unsigned long msr;
  581. #endif
  582. /* Always make any pending restarted system calls return -EINTR */
  583. current_thread_info()->restart_block.fn = do_no_restart_syscall;
  584. if (!access_ok(VERIFY_READ, uc, sizeof(*uc)))
  585. goto badframe;
  586. if (__copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
  587. goto badframe;
  588. set_current_blocked(&set);
  589. #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
  590. if (__get_user(msr, &uc->uc_mcontext.gp_regs[PT_MSR]))
  591. goto badframe;
  592. if (MSR_TM_ACTIVE(msr)) {
  593. /* We recheckpoint on return. */
  594. struct ucontext __user *uc_transact;
  595. if (__get_user(uc_transact, &uc->uc_link))
  596. goto badframe;
  597. if (restore_tm_sigcontexts(regs, &uc->uc_mcontext,
  598. &uc_transact->uc_mcontext))
  599. goto badframe;
  600. }
  601. else
  602. /* Fall through, for non-TM restore */
  603. #endif
  604. if (restore_sigcontext(regs, NULL, 1, &uc->uc_mcontext))
  605. goto badframe;
  606. if (restore_altstack(&uc->uc_stack))
  607. goto badframe;
  608. set_thread_flag(TIF_RESTOREALL);
  609. return 0;
  610. badframe:
  611. #if DEBUG_SIG
  612. printk("badframe in sys_rt_sigreturn, regs=%p uc=%p &uc->uc_mcontext=%p\n",
  613. regs, uc, &uc->uc_mcontext);
  614. #endif
  615. if (show_unhandled_signals)
  616. printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
  617. current->comm, current->pid, "rt_sigreturn",
  618. (long)uc, regs->nip, regs->link);
  619. force_sig(SIGSEGV, current);
  620. return 0;
  621. }
  622. int handle_rt_signal64(int signr, struct k_sigaction *ka, siginfo_t *info,
  623. sigset_t *set, struct pt_regs *regs)
  624. {
  625. /* Handler is *really* a pointer to the function descriptor for
  626. * the signal routine. The first entry in the function
  627. * descriptor is the entry address of signal and the second
  628. * entry is the TOC value we need to use.
  629. */
  630. func_descr_t __user *funct_desc_ptr;
  631. struct rt_sigframe __user *frame;
  632. unsigned long newsp = 0;
  633. long err = 0;
  634. frame = get_sigframe(ka, get_tm_stackpointer(regs), sizeof(*frame), 0);
  635. if (unlikely(frame == NULL))
  636. goto badframe;
  637. err |= __put_user(&frame->info, &frame->pinfo);
  638. err |= __put_user(&frame->uc, &frame->puc);
  639. err |= copy_siginfo_to_user(&frame->info, info);
  640. if (err)
  641. goto badframe;
  642. /* Create the ucontext. */
  643. err |= __put_user(0, &frame->uc.uc_flags);
  644. err |= __save_altstack(&frame->uc.uc_stack, regs->gpr[1]);
  645. #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
  646. if (MSR_TM_ACTIVE(regs->msr)) {
  647. /* The ucontext_t passed to userland points to the second
  648. * ucontext_t (for transactional state) with its uc_link ptr.
  649. */
  650. err |= __put_user(&frame->uc_transact, &frame->uc.uc_link);
  651. err |= setup_tm_sigcontexts(&frame->uc.uc_mcontext,
  652. &frame->uc_transact.uc_mcontext,
  653. regs, signr,
  654. NULL,
  655. (unsigned long)ka->sa.sa_handler);
  656. } else
  657. #endif
  658. {
  659. err |= __put_user(0, &frame->uc.uc_link);
  660. err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, signr,
  661. NULL, (unsigned long)ka->sa.sa_handler,
  662. 1);
  663. }
  664. err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
  665. if (err)
  666. goto badframe;
  667. /* Make sure signal handler doesn't get spurious FP exceptions */
  668. current->thread.fpscr.val = 0;
  669. #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
  670. /* Remove TM bits from thread's MSR. The MSR in the sigcontext
  671. * just indicates to userland that we were doing a transaction, but we
  672. * don't want to return in transactional state:
  673. */
  674. regs->msr &= ~MSR_TS_MASK;
  675. #endif
  676. /* Set up to return from userspace. */
  677. if (vdso64_rt_sigtramp && current->mm->context.vdso_base) {
  678. regs->link = current->mm->context.vdso_base + vdso64_rt_sigtramp;
  679. } else {
  680. err |= setup_trampoline(__NR_rt_sigreturn, &frame->tramp[0]);
  681. if (err)
  682. goto badframe;
  683. regs->link = (unsigned long) &frame->tramp[0];
  684. }
  685. funct_desc_ptr = (func_descr_t __user *) ka->sa.sa_handler;
  686. /* Allocate a dummy caller frame for the signal handler. */
  687. newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
  688. err |= put_user(regs->gpr[1], (unsigned long __user *)newsp);
  689. /* Set up "regs" so we "return" to the signal handler. */
  690. err |= get_user(regs->nip, &funct_desc_ptr->entry);
  691. /* enter the signal handler in big-endian mode */
  692. regs->msr &= ~MSR_LE;
  693. regs->gpr[1] = newsp;
  694. err |= get_user(regs->gpr[2], &funct_desc_ptr->toc);
  695. regs->gpr[3] = signr;
  696. regs->result = 0;
  697. if (ka->sa.sa_flags & SA_SIGINFO) {
  698. err |= get_user(regs->gpr[4], (unsigned long __user *)&frame->pinfo);
  699. err |= get_user(regs->gpr[5], (unsigned long __user *)&frame->puc);
  700. regs->gpr[6] = (unsigned long) frame;
  701. } else {
  702. regs->gpr[4] = (unsigned long)&frame->uc.uc_mcontext;
  703. }
  704. if (err)
  705. goto badframe;
  706. return 1;
  707. badframe:
  708. #if DEBUG_SIG
  709. printk("badframe in setup_rt_frame, regs=%p frame=%p newsp=%lx\n",
  710. regs, frame, newsp);
  711. #endif
  712. if (show_unhandled_signals)
  713. printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
  714. current->comm, current->pid, "setup_rt_frame",
  715. (long)frame, regs->nip, regs->link);
  716. force_sigsegv(signr, current);
  717. return 0;
  718. }