1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991001011021031041051061071081091101111121131141151161171181191201211221231241251261271281291301311321331341351361371381391401411421431441451461471481491501511521531541551561571581591601611621631641651661671681691701711721731741751761771781791801811821831841851861871881891901911921931941951961971981992002012022032042052062072082092102112122132142152162172182192202212222232242252262272282292302312322332342352362372382392402412422432442452462472482492502512522532542552562572582592602612622632642652662672682692702712722732742752762772782792802812822832842852862872882892902912922932942952962972982993003013023033043053063073083093103113123133143153163173183193203213223233243253263273283293303313323333343353363373383393403413423433443453463473483493503513523533543553563573583593603613623633643653663673683693703713723733743753763773783793803813823833843853863873883893903913923933943953963973983994004014024034044054064074084094104114124134144154164174184194204214224234244254264274284294304314324334344354364374384394404414424434444454464474484494504514524534544554564574584594604614624634644654664674684694704714724734744754764774784794804814824834844854864874884894904914924934944954964974984995005015025035045055065075085095105115125135145155165175185195205215225235245255265275285295305315325335345355365375385395405415425435445455465475485495505515525535545555565575585595605615625635645655665675685695705715725735745755765775785795805815825835845855865875885895905915925935945955965975985996006016026036046056066076086096106116126136146156166176186196206216226236246256266276286296306316326336346356366376386396406416426436446456466476486496506516526536546556566576586596606616626636646656666676686696706716726736746756766776786796806816826836846856866876886896906916926936946956966976986997007017027037047057067077087097107117127137147157167177187197207217227237247257267277287297307317327337347357367377387397407417427437447457467477487497507517527537547557567577587597607617627637647657667677687697707717727737747757767777787797807817827837847857867877887897907917927937947957967977987998008018028038048058068078088098108118128138148158168178188198208218228238248258268278288298308318328338348358368378388398408418428438448458468478488498508518528538548558568578588598608618628638648658668678688698708718728738748758768778788798808818828838848858868878888898908918928938948958968978988999009019029039049059069079089099109119129139149159169179189199209219229239249259269279289299309319329339349359369379389399409419429439449459469479489499509519529539549559569579589599609619629639649659669679689699709719729739749759769779789799809819829839849859869879889899909919929939949959969979989991000100110021003100410051006100710081009101010111012101310141015101610171018101910201021102210231024102510261027102810291030103110321033103410351036103710381039104010411042104310441045104610471048104910501051105210531054105510561057105810591060106110621063106410651066106710681069107010711072107310741075107610771078107910801081108210831084108510861087108810891090109110921093109410951096109710981099110011011102110311041105110611071108110911101111111211131114111511161117111811191120 |
- /*
- * linux/arch/m68k/kernel/signal.c
- *
- * Copyright (C) 1991, 1992 Linus Torvalds
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file COPYING in the main directory of this archive
- * for more details.
- */
- /*
- * Linux/m68k support by Hamish Macdonald
- *
- * 68060 fixes by Jesper Skov
- *
- * 1997-12-01 Modified for POSIX.1b signals by Andreas Schwab
- *
- * mathemu support by Roman Zippel
- * (Note: fpstate in the signal context is completely ignored for the emulator
- * and the internal floating point format is put on stack)
- */
- /*
- * ++roman (07/09/96): implemented signal stacks (specially for tosemu on
- * Atari :-) Current limitation: Only one sigstack can be active at one time.
- * If a second signal with SA_ONSTACK set arrives while working on a sigstack,
- * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
- * signal handlers!
- */
- #include <linux/sched.h>
- #include <linux/mm.h>
- #include <linux/kernel.h>
- #include <linux/signal.h>
- #include <linux/syscalls.h>
- #include <linux/errno.h>
- #include <linux/wait.h>
- #include <linux/ptrace.h>
- #include <linux/unistd.h>
- #include <linux/stddef.h>
- #include <linux/highuid.h>
- #include <linux/personality.h>
- #include <linux/tty.h>
- #include <linux/binfmts.h>
- #include <linux/extable.h>
- #include <linux/resume_user_mode.h>
- #include <asm/setup.h>
- #include <linux/uaccess.h>
- #include <asm/traps.h>
- #include <asm/ucontext.h>
- #include <asm/cacheflush.h>
- #ifdef CONFIG_MMU
- /*
- * Handle the slight differences in classic 68k and ColdFire trap frames.
- */
- #ifdef CONFIG_COLDFIRE
- #define FORMAT 4
- #define FMT4SIZE 0
- #else
- #define FORMAT 0
- #define FMT4SIZE sizeof_field(struct frame, un.fmt4)
- #endif
- static const int frame_size_change[16] = {
- [1] = -1, /* sizeof_field(struct frame, un.fmt1), */
- [2] = sizeof_field(struct frame, un.fmt2),
- [3] = sizeof_field(struct frame, un.fmt3),
- [4] = FMT4SIZE,
- [5] = -1, /* sizeof_field(struct frame, un.fmt5), */
- [6] = -1, /* sizeof_field(struct frame, un.fmt6), */
- [7] = sizeof_field(struct frame, un.fmt7),
- [8] = -1, /* sizeof_field(struct frame, un.fmt8), */
- [9] = sizeof_field(struct frame, un.fmt9),
- [10] = sizeof_field(struct frame, un.fmta),
- [11] = sizeof_field(struct frame, un.fmtb),
- [12] = -1, /* sizeof_field(struct frame, un.fmtc), */
- [13] = -1, /* sizeof_field(struct frame, un.fmtd), */
- [14] = -1, /* sizeof_field(struct frame, un.fmte), */
- [15] = -1, /* sizeof_field(struct frame, un.fmtf), */
- };
- static inline int frame_extra_sizes(int f)
- {
- return frame_size_change[f];
- }
- int fixup_exception(struct pt_regs *regs)
- {
- const struct exception_table_entry *fixup;
- struct pt_regs *tregs;
- /* Are we prepared to handle this kernel fault? */
- fixup = search_exception_tables(regs->pc);
- if (!fixup)
- return 0;
- /* Create a new four word stack frame, discarding the old one. */
- regs->stkadj = frame_extra_sizes(regs->format);
- tregs = (struct pt_regs *)((long)regs + regs->stkadj);
- tregs->vector = regs->vector;
- tregs->format = FORMAT;
- tregs->pc = fixup->fixup;
- tregs->sr = regs->sr;
- return 1;
- }
- static inline void push_cache (unsigned long vaddr)
- {
- /*
- * Using the old cache_push_v() was really a big waste.
- *
- * What we are trying to do is to flush 8 bytes to ram.
- * Flushing 2 cache lines of 16 bytes is much cheaper than
- * flushing 1 or 2 pages, as previously done in
- * cache_push_v().
- * Jes
- */
- if (CPU_IS_040) {
- unsigned long temp;
- __asm__ __volatile__ (".chip 68040\n\t"
- "nop\n\t"
- "ptestr (%1)\n\t"
- "movec %%mmusr,%0\n\t"
- ".chip 68k"
- : "=r" (temp)
- : "a" (vaddr));
- temp &= PAGE_MASK;
- temp |= vaddr & ~PAGE_MASK;
- __asm__ __volatile__ (".chip 68040\n\t"
- "nop\n\t"
- "cpushl %%bc,(%0)\n\t"
- ".chip 68k"
- : : "a" (temp));
- }
- else if (CPU_IS_060) {
- unsigned long temp;
- __asm__ __volatile__ (".chip 68060\n\t"
- "plpar (%0)\n\t"
- ".chip 68k"
- : "=a" (temp)
- : "0" (vaddr));
- __asm__ __volatile__ (".chip 68060\n\t"
- "cpushl %%bc,(%0)\n\t"
- ".chip 68k"
- : : "a" (temp));
- } else if (!CPU_IS_COLDFIRE) {
- /*
- * 68030/68020 have no writeback cache;
- * still need to clear icache.
- * Note that vaddr is guaranteed to be long word aligned.
- */
- unsigned long temp;
- asm volatile ("movec %%cacr,%0" : "=r" (temp));
- temp += 4;
- asm volatile ("movec %0,%%caar\n\t"
- "movec %1,%%cacr"
- : : "r" (vaddr), "r" (temp));
- asm volatile ("movec %0,%%caar\n\t"
- "movec %1,%%cacr"
- : : "r" (vaddr + 4), "r" (temp));
- } else {
- /* CPU_IS_COLDFIRE */
- #if defined(CONFIG_CACHE_COPYBACK)
- flush_cf_dcache(0, DCACHE_MAX_ADDR);
- #endif
- /* Invalidate instruction cache for the pushed bytes */
- clear_cf_icache(vaddr, vaddr + 8);
- }
- }
- static inline void adjustformat(struct pt_regs *regs)
- {
- }
- static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
- {
- }
- #else /* CONFIG_MMU */
- void ret_from_user_signal(void);
- void ret_from_user_rt_signal(void);
- static inline int frame_extra_sizes(int f)
- {
- /* No frame size adjustments required on non-MMU CPUs */
- return 0;
- }
- static inline void adjustformat(struct pt_regs *regs)
- {
- /*
- * set format byte to make stack appear modulo 4, which it will
- * be when doing the rte
- */
- regs->format = 0x4;
- }
- static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
- {
- sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5;
- }
- static inline void push_cache(unsigned long vaddr)
- {
- }
- #endif /* CONFIG_MMU */
- /*
- * Do a signal return; undo the signal stack.
- *
- * Keep the return code on the stack quadword aligned!
- * That makes the cache flush below easier.
- */
- struct sigframe
- {
- char __user *pretcode;
- int sig;
- int code;
- struct sigcontext __user *psc;
- char retcode[8];
- unsigned long extramask[_NSIG_WORDS-1];
- struct sigcontext sc;
- };
- struct rt_sigframe
- {
- char __user *pretcode;
- int sig;
- struct siginfo __user *pinfo;
- void __user *puc;
- char retcode[8];
- struct siginfo info;
- struct ucontext uc;
- };
- #define FPCONTEXT_SIZE 216
- #define uc_fpstate uc_filler[0]
- #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4]
- #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1]
- #ifdef CONFIG_FPU
- static unsigned char fpu_version; /* version number of fpu, set by setup_frame */
- static inline int restore_fpu_state(struct sigcontext *sc)
- {
- int err = 1;
- if (FPU_IS_EMU) {
- /* restore registers */
- memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12);
- memcpy(current->thread.fp, sc->sc_fpregs, 24);
- return 0;
- }
- if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
- /* Verify the frame format. */
- if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
- (sc->sc_fpstate[0] != fpu_version))
- goto out;
- if (CPU_IS_020_OR_030) {
- if (m68k_fputype & FPU_68881 &&
- !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4))
- goto out;
- if (m68k_fputype & FPU_68882 &&
- !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4))
- goto out;
- } else if (CPU_IS_040) {
- if (!(sc->sc_fpstate[1] == 0x00 ||
- sc->sc_fpstate[1] == 0x28 ||
- sc->sc_fpstate[1] == 0x60))
- goto out;
- } else if (CPU_IS_060) {
- if (!(sc->sc_fpstate[3] == 0x00 ||
- sc->sc_fpstate[3] == 0x60 ||
- sc->sc_fpstate[3] == 0xe0))
- goto out;
- } else if (CPU_IS_COLDFIRE) {
- if (!(sc->sc_fpstate[0] == 0x00 ||
- sc->sc_fpstate[0] == 0x05 ||
- sc->sc_fpstate[0] == 0xe5))
- goto out;
- } else
- goto out;
- if (CPU_IS_COLDFIRE) {
- __asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t"
- "fmovel %1,%%fpcr\n\t"
- "fmovel %2,%%fpsr\n\t"
- "fmovel %3,%%fpiar"
- : /* no outputs */
- : "m" (sc->sc_fpregs[0]),
- "m" (sc->sc_fpcntl[0]),
- "m" (sc->sc_fpcntl[1]),
- "m" (sc->sc_fpcntl[2]));
- } else {
- __asm__ volatile (".chip 68k/68881\n\t"
- "fmovemx %0,%%fp0-%%fp1\n\t"
- "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
- ".chip 68k"
- : /* no outputs */
- : "m" (*sc->sc_fpregs),
- "m" (*sc->sc_fpcntl));
- }
- }
- if (CPU_IS_COLDFIRE) {
- __asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate));
- } else {
- __asm__ volatile (".chip 68k/68881\n\t"
- "frestore %0\n\t"
- ".chip 68k"
- : : "m" (*sc->sc_fpstate));
- }
- err = 0;
- out:
- return err;
- }
- static inline int rt_restore_fpu_state(struct ucontext __user *uc)
- {
- unsigned char fpstate[FPCONTEXT_SIZE];
- int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
- fpregset_t fpregs;
- int err = 1;
- if (FPU_IS_EMU) {
- /* restore fpu control register */
- if (__copy_from_user(current->thread.fpcntl,
- uc->uc_mcontext.fpregs.f_fpcntl, 12))
- goto out;
- /* restore all other fpu register */
- if (__copy_from_user(current->thread.fp,
- uc->uc_mcontext.fpregs.f_fpregs, 96))
- goto out;
- return 0;
- }
- if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate))
- goto out;
- if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
- if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
- context_size = fpstate[1];
- /* Verify the frame format. */
- if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
- (fpstate[0] != fpu_version))
- goto out;
- if (CPU_IS_020_OR_030) {
- if (m68k_fputype & FPU_68881 &&
- !(context_size == 0x18 || context_size == 0xb4))
- goto out;
- if (m68k_fputype & FPU_68882 &&
- !(context_size == 0x38 || context_size == 0xd4))
- goto out;
- } else if (CPU_IS_040) {
- if (!(context_size == 0x00 ||
- context_size == 0x28 ||
- context_size == 0x60))
- goto out;
- } else if (CPU_IS_060) {
- if (!(fpstate[3] == 0x00 ||
- fpstate[3] == 0x60 ||
- fpstate[3] == 0xe0))
- goto out;
- } else if (CPU_IS_COLDFIRE) {
- if (!(fpstate[3] == 0x00 ||
- fpstate[3] == 0x05 ||
- fpstate[3] == 0xe5))
- goto out;
- } else
- goto out;
- if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs,
- sizeof(fpregs)))
- goto out;
- if (CPU_IS_COLDFIRE) {
- __asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t"
- "fmovel %1,%%fpcr\n\t"
- "fmovel %2,%%fpsr\n\t"
- "fmovel %3,%%fpiar"
- : /* no outputs */
- : "m" (fpregs.f_fpregs[0]),
- "m" (fpregs.f_fpcntl[0]),
- "m" (fpregs.f_fpcntl[1]),
- "m" (fpregs.f_fpcntl[2]));
- } else {
- __asm__ volatile (".chip 68k/68881\n\t"
- "fmovemx %0,%%fp0-%%fp7\n\t"
- "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
- ".chip 68k"
- : /* no outputs */
- : "m" (*fpregs.f_fpregs),
- "m" (*fpregs.f_fpcntl));
- }
- }
- if (context_size &&
- __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1,
- context_size))
- goto out;
- if (CPU_IS_COLDFIRE) {
- __asm__ volatile ("frestore %0" : : "m" (*fpstate));
- } else {
- __asm__ volatile (".chip 68k/68881\n\t"
- "frestore %0\n\t"
- ".chip 68k"
- : : "m" (*fpstate));
- }
- err = 0;
- out:
- return err;
- }
- /*
- * Set up a signal frame.
- */
- static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
- {
- if (FPU_IS_EMU) {
- /* save registers */
- memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
- memcpy(sc->sc_fpregs, current->thread.fp, 24);
- return;
- }
- if (CPU_IS_COLDFIRE) {
- __asm__ volatile ("fsave %0"
- : : "m" (*sc->sc_fpstate) : "memory");
- } else {
- __asm__ volatile (".chip 68k/68881\n\t"
- "fsave %0\n\t"
- ".chip 68k"
- : : "m" (*sc->sc_fpstate) : "memory");
- }
- if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
- fpu_version = sc->sc_fpstate[0];
- if (CPU_IS_020_OR_030 && !regs->stkadj &&
- regs->vector >= (VEC_FPBRUC * 4) &&
- regs->vector <= (VEC_FPNAN * 4)) {
- /* Clear pending exception in 68882 idle frame */
- if (*(unsigned short *) sc->sc_fpstate == 0x1f38)
- sc->sc_fpstate[0x38] |= 1 << 3;
- }
- if (CPU_IS_COLDFIRE) {
- __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t"
- "fmovel %%fpcr,%1\n\t"
- "fmovel %%fpsr,%2\n\t"
- "fmovel %%fpiar,%3"
- : "=m" (sc->sc_fpregs[0]),
- "=m" (sc->sc_fpcntl[0]),
- "=m" (sc->sc_fpcntl[1]),
- "=m" (sc->sc_fpcntl[2])
- : /* no inputs */
- : "memory");
- } else {
- __asm__ volatile (".chip 68k/68881\n\t"
- "fmovemx %%fp0-%%fp1,%0\n\t"
- "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
- ".chip 68k"
- : "=m" (*sc->sc_fpregs),
- "=m" (*sc->sc_fpcntl)
- : /* no inputs */
- : "memory");
- }
- }
- }
- static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
- {
- unsigned char fpstate[FPCONTEXT_SIZE];
- int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
- int err = 0;
- if (FPU_IS_EMU) {
- /* save fpu control register */
- err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl,
- current->thread.fpcntl, 12);
- /* save all other fpu register */
- err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
- current->thread.fp, 96);
- return err;
- }
- if (CPU_IS_COLDFIRE) {
- __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory");
- } else {
- __asm__ volatile (".chip 68k/68881\n\t"
- "fsave %0\n\t"
- ".chip 68k"
- : : "m" (*fpstate) : "memory");
- }
- err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
- if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
- fpregset_t fpregs;
- if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
- context_size = fpstate[1];
- fpu_version = fpstate[0];
- if (CPU_IS_020_OR_030 && !regs->stkadj &&
- regs->vector >= (VEC_FPBRUC * 4) &&
- regs->vector <= (VEC_FPNAN * 4)) {
- /* Clear pending exception in 68882 idle frame */
- if (*(unsigned short *) fpstate == 0x1f38)
- fpstate[0x38] |= 1 << 3;
- }
- if (CPU_IS_COLDFIRE) {
- __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t"
- "fmovel %%fpcr,%1\n\t"
- "fmovel %%fpsr,%2\n\t"
- "fmovel %%fpiar,%3"
- : "=m" (fpregs.f_fpregs[0]),
- "=m" (fpregs.f_fpcntl[0]),
- "=m" (fpregs.f_fpcntl[1]),
- "=m" (fpregs.f_fpcntl[2])
- : /* no inputs */
- : "memory");
- } else {
- __asm__ volatile (".chip 68k/68881\n\t"
- "fmovemx %%fp0-%%fp7,%0\n\t"
- "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
- ".chip 68k"
- : "=m" (*fpregs.f_fpregs),
- "=m" (*fpregs.f_fpcntl)
- : /* no inputs */
- : "memory");
- }
- err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
- sizeof(fpregs));
- }
- if (context_size)
- err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
- context_size);
- return err;
- }
- #else /* CONFIG_FPU */
- /*
- * For the case with no FPU configured these all do nothing.
- */
- static inline int restore_fpu_state(struct sigcontext *sc)
- {
- return 0;
- }
- static inline int rt_restore_fpu_state(struct ucontext __user *uc)
- {
- return 0;
- }
- static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
- {
- }
- static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
- {
- return 0;
- }
- #endif /* CONFIG_FPU */
- static inline void siginfo_build_tests(void)
- {
- /*
- * This needs to be tested on m68k as it has a lesser
- * alignment requirement than x86 and that can cause surprises.
- */
- /* This is part of the ABI and can never change in size: */
- BUILD_BUG_ON(sizeof(siginfo_t) != 128);
- /* Ensure the known fields never change in location */
- BUILD_BUG_ON(offsetof(siginfo_t, si_signo) != 0);
- BUILD_BUG_ON(offsetof(siginfo_t, si_errno) != 4);
- BUILD_BUG_ON(offsetof(siginfo_t, si_code) != 8);
- /* _kill */
- BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c);
- BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10);
- /* _timer */
- BUILD_BUG_ON(offsetof(siginfo_t, si_tid) != 0x0c);
- BUILD_BUG_ON(offsetof(siginfo_t, si_overrun) != 0x10);
- BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x14);
- /* _rt */
- BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c);
- BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10);
- BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x14);
- /* _sigchld */
- BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c);
- BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10);
- BUILD_BUG_ON(offsetof(siginfo_t, si_status) != 0x14);
- BUILD_BUG_ON(offsetof(siginfo_t, si_utime) != 0x18);
- BUILD_BUG_ON(offsetof(siginfo_t, si_stime) != 0x1c);
- /* _sigfault */
- BUILD_BUG_ON(offsetof(siginfo_t, si_addr) != 0x0c);
- /* _sigfault._mcerr */
- BUILD_BUG_ON(offsetof(siginfo_t, si_addr_lsb) != 0x10);
- /* _sigfault._addr_bnd */
- BUILD_BUG_ON(offsetof(siginfo_t, si_lower) != 0x12);
- BUILD_BUG_ON(offsetof(siginfo_t, si_upper) != 0x16);
- /* _sigfault._addr_pkey */
- BUILD_BUG_ON(offsetof(siginfo_t, si_pkey) != 0x12);
- /* _sigfault._perf */
- BUILD_BUG_ON(offsetof(siginfo_t, si_perf_data) != 0x10);
- BUILD_BUG_ON(offsetof(siginfo_t, si_perf_type) != 0x14);
- BUILD_BUG_ON(offsetof(siginfo_t, si_perf_flags) != 0x18);
- /* _sigpoll */
- BUILD_BUG_ON(offsetof(siginfo_t, si_band) != 0x0c);
- BUILD_BUG_ON(offsetof(siginfo_t, si_fd) != 0x10);
- /* _sigsys */
- BUILD_BUG_ON(offsetof(siginfo_t, si_call_addr) != 0x0c);
- BUILD_BUG_ON(offsetof(siginfo_t, si_syscall) != 0x10);
- BUILD_BUG_ON(offsetof(siginfo_t, si_arch) != 0x14);
- /* any new si_fields should be added here */
- }
- static int mangle_kernel_stack(struct pt_regs *regs, int formatvec,
- void __user *fp)
- {
- int extra = frame_extra_sizes(formatvec >> 12);
- char buf[sizeof_field(struct frame, un)];
- if (extra < 0) {
- /*
- * user process trying to return with weird frame format
- */
- pr_debug("user process returning with weird frame format\n");
- return -1;
- }
- if (extra && copy_from_user(buf, fp, extra))
- return -1;
- regs->format = formatvec >> 12;
- regs->vector = formatvec & 0xfff;
- if (extra) {
- void *p = (struct switch_stack *)regs - 1;
- struct frame *new = (void *)regs - extra;
- int size = sizeof(struct pt_regs)+sizeof(struct switch_stack);
- memmove(p - extra, p, size);
- memcpy(p - extra + size, buf, extra);
- current->thread.esp0 = (unsigned long)&new->ptregs;
- #ifdef CONFIG_M68040
- /* on 68040 complete pending writebacks if any */
- if (new->ptregs.format == 7) // bus error frame
- berr_040cleanup(new);
- #endif
- }
- return extra;
- }
- static inline int
- restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp)
- {
- int formatvec;
- struct sigcontext context;
- siginfo_build_tests();
- /* Always make any pending restarted system calls return -EINTR */
- current->restart_block.fn = do_no_restart_syscall;
- /* get previous context */
- if (copy_from_user(&context, usc, sizeof(context)))
- return -1;
- /* restore passed registers */
- regs->d0 = context.sc_d0;
- regs->d1 = context.sc_d1;
- regs->a0 = context.sc_a0;
- regs->a1 = context.sc_a1;
- regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
- regs->pc = context.sc_pc;
- regs->orig_d0 = -1; /* disable syscall checks */
- wrusp(context.sc_usp);
- formatvec = context.sc_formatvec;
- if (restore_fpu_state(&context))
- return -1;
- return mangle_kernel_stack(regs, formatvec, fp);
- }
- static inline int
- rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
- struct ucontext __user *uc)
- {
- int temp;
- greg_t __user *gregs = uc->uc_mcontext.gregs;
- unsigned long usp;
- int err;
- /* Always make any pending restarted system calls return -EINTR */
- current->restart_block.fn = do_no_restart_syscall;
- err = __get_user(temp, &uc->uc_mcontext.version);
- if (temp != MCONTEXT_VERSION)
- return -1;
- /* restore passed registers */
- err |= __get_user(regs->d0, &gregs[0]);
- err |= __get_user(regs->d1, &gregs[1]);
- err |= __get_user(regs->d2, &gregs[2]);
- err |= __get_user(regs->d3, &gregs[3]);
- err |= __get_user(regs->d4, &gregs[4]);
- err |= __get_user(regs->d5, &gregs[5]);
- err |= __get_user(sw->d6, &gregs[6]);
- err |= __get_user(sw->d7, &gregs[7]);
- err |= __get_user(regs->a0, &gregs[8]);
- err |= __get_user(regs->a1, &gregs[9]);
- err |= __get_user(regs->a2, &gregs[10]);
- err |= __get_user(sw->a3, &gregs[11]);
- err |= __get_user(sw->a4, &gregs[12]);
- err |= __get_user(sw->a5, &gregs[13]);
- err |= __get_user(sw->a6, &gregs[14]);
- err |= __get_user(usp, &gregs[15]);
- wrusp(usp);
- err |= __get_user(regs->pc, &gregs[16]);
- err |= __get_user(temp, &gregs[17]);
- regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
- regs->orig_d0 = -1; /* disable syscall checks */
- err |= __get_user(temp, &uc->uc_formatvec);
- err |= rt_restore_fpu_state(uc);
- err |= restore_altstack(&uc->uc_stack);
- if (err)
- return -1;
- return mangle_kernel_stack(regs, temp, &uc->uc_extra);
- }
- asmlinkage void *do_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
- {
- unsigned long usp = rdusp();
- struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
- sigset_t set;
- int size;
- if (!access_ok(frame, sizeof(*frame)))
- goto badframe;
- if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
- (_NSIG_WORDS > 1 &&
- __copy_from_user(&set.sig[1], &frame->extramask,
- sizeof(frame->extramask))))
- goto badframe;
- set_current_blocked(&set);
- size = restore_sigcontext(regs, &frame->sc, frame + 1);
- if (size < 0)
- goto badframe;
- return (void *)sw - size;
- badframe:
- force_sig(SIGSEGV);
- return sw;
- }
- asmlinkage void *do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
- {
- unsigned long usp = rdusp();
- struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
- sigset_t set;
- int size;
- if (!access_ok(frame, sizeof(*frame)))
- goto badframe;
- if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
- goto badframe;
- set_current_blocked(&set);
- size = rt_restore_ucontext(regs, sw, &frame->uc);
- if (size < 0)
- goto badframe;
- return (void *)sw - size;
- badframe:
- force_sig(SIGSEGV);
- return sw;
- }
- static inline struct pt_regs *rte_regs(struct pt_regs *regs)
- {
- return (void *)regs + regs->stkadj;
- }
- static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
- unsigned long mask)
- {
- struct pt_regs *tregs = rte_regs(regs);
- sc->sc_mask = mask;
- sc->sc_usp = rdusp();
- sc->sc_d0 = regs->d0;
- sc->sc_d1 = regs->d1;
- sc->sc_a0 = regs->a0;
- sc->sc_a1 = regs->a1;
- sc->sc_sr = tregs->sr;
- sc->sc_pc = tregs->pc;
- sc->sc_formatvec = tregs->format << 12 | tregs->vector;
- save_a5_state(sc, regs);
- save_fpu_state(sc, regs);
- }
- static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
- {
- struct switch_stack *sw = (struct switch_stack *)regs - 1;
- struct pt_regs *tregs = rte_regs(regs);
- greg_t __user *gregs = uc->uc_mcontext.gregs;
- int err = 0;
- err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
- err |= __put_user(regs->d0, &gregs[0]);
- err |= __put_user(regs->d1, &gregs[1]);
- err |= __put_user(regs->d2, &gregs[2]);
- err |= __put_user(regs->d3, &gregs[3]);
- err |= __put_user(regs->d4, &gregs[4]);
- err |= __put_user(regs->d5, &gregs[5]);
- err |= __put_user(sw->d6, &gregs[6]);
- err |= __put_user(sw->d7, &gregs[7]);
- err |= __put_user(regs->a0, &gregs[8]);
- err |= __put_user(regs->a1, &gregs[9]);
- err |= __put_user(regs->a2, &gregs[10]);
- err |= __put_user(sw->a3, &gregs[11]);
- err |= __put_user(sw->a4, &gregs[12]);
- err |= __put_user(sw->a5, &gregs[13]);
- err |= __put_user(sw->a6, &gregs[14]);
- err |= __put_user(rdusp(), &gregs[15]);
- err |= __put_user(tregs->pc, &gregs[16]);
- err |= __put_user(tregs->sr, &gregs[17]);
- err |= __put_user((tregs->format << 12) | tregs->vector, &uc->uc_formatvec);
- err |= rt_save_fpu_state(uc, regs);
- return err;
- }
- static inline void __user *
- get_sigframe(struct ksignal *ksig, struct pt_regs *tregs, size_t frame_size)
- {
- unsigned long usp = sigsp(rdusp(), ksig);
- unsigned long gap = 0;
- if (CPU_IS_020_OR_030 && tregs->format == 0xb) {
- /* USP is unreliable so use worst-case value */
- gap = 256;
- }
- return (void __user *)((usp - gap - frame_size) & -8UL);
- }
- static int setup_frame(struct ksignal *ksig, sigset_t *set,
- struct pt_regs *regs)
- {
- struct sigframe __user *frame;
- struct pt_regs *tregs = rte_regs(regs);
- int fsize = frame_extra_sizes(tregs->format);
- struct sigcontext context;
- int err = 0, sig = ksig->sig;
- if (fsize < 0) {
- pr_debug("setup_frame: Unknown frame format %#x\n",
- tregs->format);
- return -EFAULT;
- }
- frame = get_sigframe(ksig, tregs, sizeof(*frame) + fsize);
- if (fsize)
- err |= copy_to_user (frame + 1, regs + 1, fsize);
- err |= __put_user(sig, &frame->sig);
- err |= __put_user(tregs->vector, &frame->code);
- err |= __put_user(&frame->sc, &frame->psc);
- if (_NSIG_WORDS > 1)
- err |= copy_to_user(frame->extramask, &set->sig[1],
- sizeof(frame->extramask));
- setup_sigcontext(&context, regs, set->sig[0]);
- err |= copy_to_user (&frame->sc, &context, sizeof(context));
- /* Set up to return from userspace. */
- #ifdef CONFIG_MMU
- err |= __put_user(frame->retcode, &frame->pretcode);
- /* moveq #,d0; trap #0 */
- err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
- (long __user *)(frame->retcode));
- #else
- err |= __put_user((long) ret_from_user_signal,
- (long __user *) &frame->pretcode);
- #endif
- if (err)
- return -EFAULT;
- push_cache ((unsigned long) &frame->retcode);
- /*
- * This is subtle; if we build more than one sigframe, all but the
- * first one will see frame format 0 and have fsize == 0, so we won't
- * screw stkadj.
- */
- if (fsize) {
- regs->stkadj = fsize;
- tregs = rte_regs(regs);
- pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
- tregs->vector = 0;
- tregs->format = 0;
- tregs->sr = regs->sr;
- }
- /*
- * Set up registers for signal handler. All the state we are about
- * to destroy is successfully copied to sigframe.
- */
- wrusp ((unsigned long) frame);
- tregs->pc = (unsigned long) ksig->ka.sa.sa_handler;
- adjustformat(regs);
- return 0;
- }
- static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
- struct pt_regs *regs)
- {
- struct rt_sigframe __user *frame;
- struct pt_regs *tregs = rte_regs(regs);
- int fsize = frame_extra_sizes(tregs->format);
- int err = 0, sig = ksig->sig;
- if (fsize < 0) {
- pr_debug("setup_frame: Unknown frame format %#x\n",
- regs->format);
- return -EFAULT;
- }
- frame = get_sigframe(ksig, tregs, sizeof(*frame));
- if (fsize)
- err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
- err |= __put_user(sig, &frame->sig);
- err |= __put_user(&frame->info, &frame->pinfo);
- err |= __put_user(&frame->uc, &frame->puc);
- err |= copy_siginfo_to_user(&frame->info, &ksig->info);
- /* Create the ucontext. */
- err |= __put_user(0, &frame->uc.uc_flags);
- err |= __put_user(NULL, &frame->uc.uc_link);
- err |= __save_altstack(&frame->uc.uc_stack, rdusp());
- err |= rt_setup_ucontext(&frame->uc, regs);
- err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
- /* Set up to return from userspace. */
- #ifdef CONFIG_MMU
- err |= __put_user(frame->retcode, &frame->pretcode);
- #ifdef __mcoldfire__
- /* movel #__NR_rt_sigreturn,d0; trap #0 */
- err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0));
- err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16),
- (long __user *)(frame->retcode + 4));
- #else
- /* moveq #,d0; notb d0; trap #0 */
- err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16),
- (long __user *)(frame->retcode + 0));
- err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
- #endif
- #else
- err |= __put_user((long) ret_from_user_rt_signal,
- (long __user *) &frame->pretcode);
- #endif /* CONFIG_MMU */
- if (err)
- return -EFAULT;
- push_cache ((unsigned long) &frame->retcode);
- /*
- * This is subtle; if we build more than one sigframe, all but the
- * first one will see frame format 0 and have fsize == 0, so we won't
- * screw stkadj.
- */
- if (fsize) {
- regs->stkadj = fsize;
- tregs = rte_regs(regs);
- pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
- tregs->vector = 0;
- tregs->format = 0;
- tregs->sr = regs->sr;
- }
- /*
- * Set up registers for signal handler. All the state we are about
- * to destroy is successfully copied to sigframe.
- */
- wrusp ((unsigned long) frame);
- tregs->pc = (unsigned long) ksig->ka.sa.sa_handler;
- adjustformat(regs);
- return 0;
- }
- static inline void
- handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
- {
- switch (regs->d0) {
- case -ERESTARTNOHAND:
- if (!has_handler)
- goto do_restart;
- regs->d0 = -EINTR;
- break;
- case -ERESTART_RESTARTBLOCK:
- if (!has_handler) {
- regs->d0 = __NR_restart_syscall;
- regs->pc -= 2;
- break;
- }
- regs->d0 = -EINTR;
- break;
- case -ERESTARTSYS:
- if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
- regs->d0 = -EINTR;
- break;
- }
- fallthrough;
- case -ERESTARTNOINTR:
- do_restart:
- regs->d0 = regs->orig_d0;
- regs->pc -= 2;
- break;
- }
- }
- /*
- * OK, we're invoking a handler
- */
- static void
- handle_signal(struct ksignal *ksig, struct pt_regs *regs)
- {
- sigset_t *oldset = sigmask_to_save();
- int err;
- /* are we from a system call? */
- if (regs->orig_d0 >= 0)
- /* If so, check system call restarting.. */
- handle_restart(regs, &ksig->ka, 1);
- /* set up the stack frame */
- if (ksig->ka.sa.sa_flags & SA_SIGINFO)
- err = setup_rt_frame(ksig, oldset, regs);
- else
- err = setup_frame(ksig, oldset, regs);
- signal_setup_done(err, ksig, 0);
- if (test_thread_flag(TIF_DELAYED_TRACE)) {
- regs->sr &= ~0x8000;
- send_sig(SIGTRAP, current, 1);
- }
- }
- /*
- * Note that 'init' is a special process: it doesn't get signals it doesn't
- * want to handle. Thus you cannot kill init even with a SIGKILL even by
- * mistake.
- */
- static void do_signal(struct pt_regs *regs)
- {
- struct ksignal ksig;
- current->thread.esp0 = (unsigned long) regs;
- if (get_signal(&ksig)) {
- /* Whee! Actually deliver the signal. */
- handle_signal(&ksig, regs);
- return;
- }
- /* Did we come from a system call? */
- if (regs->orig_d0 >= 0)
- /* Restart the system call - no handlers present */
- handle_restart(regs, NULL, 0);
- /* If there's no signal to deliver, we just restore the saved mask. */
- restore_saved_sigmask();
- }
- void do_notify_resume(struct pt_regs *regs)
- {
- if (test_thread_flag(TIF_NOTIFY_SIGNAL) ||
- test_thread_flag(TIF_SIGPENDING))
- do_signal(regs);
- if (test_thread_flag(TIF_NOTIFY_RESUME))
- resume_user_mode_work(regs);
- }
|