/* $Id: signal32.c,v 1.74 2002/02/09 19:49:30 davem Exp $ * arch/sparc64/kernel/signal32.c * * Copyright (C) 1991, 1992 Linus Torvalds * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) /* Signal frames: the original one (compatible with SunOS): * * Set up a signal frame... Make the stack look the way SunOS * expects it to look which is basically: * * ---------------------------------- <-- %sp at signal time * Struct sigcontext * Signal address * Ptr to sigcontext area above * Signal code * The signal number itself * One register window * ---------------------------------- <-- New %sp */ struct signal_sframe32 { struct reg_window32 sig_window; int sig_num; int sig_code; /* struct sigcontext32 * */ u32 sig_scptr; int sig_address; struct sigcontext32 sig_context; unsigned int extramask[_COMPAT_NSIG_WORDS - 1]; }; /* This magic should be in g_upper[0] for all upper parts * to be valid. */ #define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269 typedef struct { unsigned int g_upper[8]; unsigned int o_upper[8]; unsigned int asi; } siginfo_extra_v8plus_t; /* * And the new one, intended to be used for Linux applications only * (we have enough in there to work with clone). * All the interesting bits are in the info field. */ struct new_signal_frame32 { struct sparc_stackf32 ss; __siginfo32_t info; /* __siginfo_fpu32_t * */ u32 fpu_save; unsigned int insns[2]; unsigned int extramask[_COMPAT_NSIG_WORDS - 1]; unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ siginfo_extra_v8plus_t v8plus; __siginfo_fpu_t fpu_state; }; typedef struct compat_siginfo{ int si_signo; int si_errno; int si_code; union { int _pad[SI_PAD_SIZE32]; /* kill() */ struct { compat_pid_t _pid; /* sender's pid */ unsigned int _uid; /* sender's uid */ } _kill; /* POSIX.1b timers */ struct { compat_timer_t _tid; /* timer id */ int _overrun; /* overrun count */ compat_sigval_t _sigval; /* same as below */ int _sys_private; /* not to be passed to user */ } _timer; /* POSIX.1b signals */ struct { compat_pid_t _pid; /* sender's pid */ unsigned int _uid; /* sender's uid */ compat_sigval_t _sigval; } _rt; /* SIGCHLD */ struct { compat_pid_t _pid; /* which child */ unsigned int _uid; /* sender's uid */ int _status; /* exit code */ compat_clock_t _utime; compat_clock_t _stime; } _sigchld; /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGEMT */ struct { u32 _addr; /* faulting insn/memory ref. */ int _trapno; } _sigfault; /* SIGPOLL */ struct { int _band; /* POLL_IN, POLL_OUT, POLL_MSG */ int _fd; } _sigpoll; } _sifields; }compat_siginfo_t; struct rt_signal_frame32 { struct sparc_stackf32 ss; compat_siginfo_t info; struct pt_regs32 regs; compat_sigset_t mask; /* __siginfo_fpu32_t * */ u32 fpu_save; unsigned int insns[2]; stack_t32 stack; unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ siginfo_extra_v8plus_t v8plus; __siginfo_fpu_t fpu_state; }; /* Align macros */ #define SF_ALIGNEDSZ (((sizeof(struct signal_sframe32) + 7) & (~7))) #define NF_ALIGNEDSZ (((sizeof(struct new_signal_frame32) + 7) & (~7))) #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame32) + 7) & (~7))) int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) { int err; if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) return -EFAULT; /* If you change siginfo_t structure, please be sure this code is fixed accordingly. It should never copy any pad contained in the structure to avoid security leaks, but must copy the generic 3 ints plus the relevant union member. This routine must convert siginfo from 64bit to 32bit as well at the same time. */ err = __put_user(from->si_signo, &to->si_signo); err |= __put_user(from->si_errno, &to->si_errno); err |= __put_user((short)from->si_code, &to->si_code); if (from->si_code < 0) err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); else { switch (from->si_code >> 16) { case __SI_TIMER >> 16: err |= __put_user(from->si_tid, &to->si_tid); err |= __put_user(from->si_overrun, &to->si_overrun); err |= __put_user(from->si_int, &to->si_int); break; case __SI_CHLD >> 16: err |= __put_user(from->si_utime, &to->si_utime); err |= __put_user(from->si_stime, &to->si_stime); err |= __put_user(from->si_status, &to->si_status); default: err |= __put_user(from->si_pid, &to->si_pid); err |= __put_user(from->si_uid, &to->si_uid); break; case __SI_FAULT >> 16: err |= __put_user(from->si_trapno, &to->si_trapno); err |= __put_user((unsigned long)from->si_addr, &to->si_addr); break; case __SI_POLL >> 16: err |= __put_user(from->si_band, &to->si_band); err |= __put_user(from->si_fd, &to->si_fd); break; case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ case __SI_MESGQ >> 16: err |= __put_user(from->si_pid, &to->si_pid); err |= __put_user(from->si_uid, &to->si_uid); err |= __put_user(from->si_int, &to->si_int); break; } } return err; } /* CAUTION: This is just a very minimalist implementation for the * sake of compat_sys_rt_sigqueueinfo() */ int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) { if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t))) return -EFAULT; if (copy_from_user(to, from, 3*sizeof(int)) || copy_from_user(to->_sifields._pad, from->_sifields._pad, SI_PAD_SIZE)) return -EFAULT; return 0; } static int restore_fpu_state32(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) { unsigned long *fpregs = current_thread_info()->fpregs; unsigned long fprs; int err; err = __get_user(fprs, &fpu->si_fprs); fprs_write(0); regs->tstate &= ~TSTATE_PEF; if (fprs & FPRS_DL) err |= copy_from_user(fpregs, &fpu->si_float_regs[0], (sizeof(unsigned int) * 32)); if (fprs & FPRS_DU) err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32], (sizeof(unsigned int) * 32)); err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr); err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr); current_thread_info()->fpsaved[0] |= fprs; return err; } void do_new_sigreturn32(struct pt_regs *regs) { struct new_signal_frame32 __user *sf; unsigned int psr; unsigned pc, npc, fpu_save; sigset_t set; unsigned seta[_COMPAT_NSIG_WORDS]; int err, i; regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; sf = (struct new_signal_frame32 __user *) regs->u_regs[UREG_FP]; /* 1. Make sure we are not getting garbage from the user */ if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || (((unsigned long) sf) & 3)) goto segv; get_user(pc, &sf->info.si_regs.pc); __get_user(npc, &sf->info.si_regs.npc); if ((pc | npc) & 3) goto segv; if (test_thread_flag(TIF_32BIT)) { pc &= 0xffffffff; npc &= 0xffffffff; } regs->tpc = pc; regs->tnpc = npc; /* 2. Restore the state */ err = __get_user(regs->y, &sf->info.si_regs.y); err |= __get_user(psr, &sf->info.si_regs.psr); for (i = UREG_G1; i <= UREG_I7; i++) err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { err |= __get_user(i, &sf->v8plus.g_upper[0]); if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { unsigned long asi; for (i = UREG_G1; i <= UREG_I7; i++) err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); err |= __get_user(asi, &sf->v8plus.asi); regs->tstate &= ~TSTATE_ASI; regs->tstate |= ((asi & 0xffUL) << 24UL); } } /* User can only change condition codes in %tstate. */ regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); regs->tstate |= psr_to_tstate_icc(psr); err |= __get_user(fpu_save, &sf->fpu_save); if (fpu_save) err |= restore_fpu_state32(regs, &sf->fpu_state); err |= __get_user(seta[0], &sf->info.si_mask); err |= copy_from_user(seta+1, &sf->extramask, (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); if (err) goto segv; switch (_NSIG_WORDS) { case 4: set.sig[3] = seta[6] + (((long)seta[7]) << 32); case 3: set.sig[2] = seta[4] + (((long)seta[5]) << 32); case 2: set.sig[1] = seta[2] + (((long)seta[3]) << 32); case 1: set.sig[0] = seta[0] + (((long)seta[1]) << 32); } sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sighand->siglock); current->blocked = set; recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); return; segv: force_sig(SIGSEGV, current); } asmlinkage void do_sigreturn32(struct pt_regs *regs) { struct sigcontext32 __user *scptr; unsigned int pc, npc, psr; sigset_t set; unsigned int seta[_COMPAT_NSIG_WORDS]; int err; /* Always make any pending restarted system calls return -EINTR */ current_thread_info()->restart_block.fn = do_no_restart_syscall; synchronize_user_stack(); if (test_thread_flag(TIF_NEWSIGNALS)) { do_new_sigreturn32(regs); return; } scptr = (struct sigcontext32 __user *) (regs->u_regs[UREG_I0] & 0x00000000ffffffffUL); /* Check sanity of the user arg. */ if (!access_ok(VERIFY_READ, scptr, sizeof(struct sigcontext32)) || (((unsigned long) scptr) & 3)) goto segv; err = __get_user(pc, &scptr->sigc_pc); err |= __get_user(npc, &scptr->sigc_npc); if ((pc | npc) & 3) goto segv; /* Nice try. */ err |= __get_user(seta[0], &scptr->sigc_mask); /* Note that scptr + 1 points to extramask */ err |= copy_from_user(seta+1, scptr + 1, (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); if (err) goto segv; switch (_NSIG_WORDS) { case 4: set.sig[3] = seta[6] + (((long)seta[7]) << 32); case 3: set.sig[2] = seta[4] + (((long)seta[5]) << 32); case 2: set.sig[1] = seta[2] + (((long)seta[3]) << 32); case 1: set.sig[0] = seta[0] + (((long)seta[1]) << 32); } sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sighand->siglock); current->blocked = set; recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); if (test_thread_flag(TIF_32BIT)) { pc &= 0xffffffff; npc &= 0xffffffff; } regs->tpc = pc; regs->tnpc = npc; err = __get_user(regs->u_regs[UREG_FP], &scptr->sigc_sp); err |= __get_user(regs->u_regs[UREG_I0], &scptr->sigc_o0); err |= __get_user(regs->u_regs[UREG_G1], &scptr->sigc_g1); /* User can only change condition codes in %tstate. */ err |= __get_user(psr, &scptr->sigc_psr); if (err) goto segv; regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); regs->tstate |= psr_to_tstate_icc(psr); return; segv: force_sig(SIGSEGV, current); } asmlinkage void do_rt_sigreturn32(struct pt_regs *regs) { struct rt_signal_frame32 __user *sf; unsigned int psr, pc, npc, fpu_save, u_ss_sp; mm_segment_t old_fs; sigset_t set; compat_sigset_t seta; stack_t st; int err, i; /* Always make any pending restarted system calls return -EINTR */ current_thread_info()->restart_block.fn = do_no_restart_syscall; synchronize_user_stack(); regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP]; /* 1. Make sure we are not getting garbage from the user */ if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || (((unsigned long) sf) & 3)) goto segv; get_user(pc, &sf->regs.pc); __get_user(npc, &sf->regs.npc); if ((pc | npc) & 3) goto segv; if (test_thread_flag(TIF_32BIT)) { pc &= 0xffffffff; npc &= 0xffffffff; } regs->tpc = pc; regs->tnpc = npc; /* 2. Restore the state */ err = __get_user(regs->y, &sf->regs.y); err |= __get_user(psr, &sf->regs.psr); for (i = UREG_G1; i <= UREG_I7; i++) err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]); if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { err |= __get_user(i, &sf->v8plus.g_upper[0]); if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { unsigned long asi; for (i = UREG_G1; i <= UREG_I7; i++) err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); err |= __get_user(asi, &sf->v8plus.asi); regs->tstate &= ~TSTATE_ASI; regs->tstate |= ((asi & 0xffUL) << 24UL); } } /* User can only change condition codes in %tstate. */ regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); regs->tstate |= psr_to_tstate_icc(psr); err |= __get_user(fpu_save, &sf->fpu_save); if (fpu_save) err |= restore_fpu_state32(regs, &sf->fpu_state); err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t)); err |= __get_user(u_ss_sp, &sf->stack.ss_sp); st.ss_sp = compat_ptr(u_ss_sp); err |= __get_user(st.ss_flags, &sf->stack.ss_flags); err |= __get_user(st.ss_size, &sf->stack.ss_size); if (err) goto segv; /* It is more difficult to avoid calling this function than to call it and ignore errors. */ old_fs = get_fs(); set_fs(KERNEL_DS); do_sigaltstack((stack_t __user *) &st, NULL, (unsigned long)sf); set_fs(old_fs); switch (_NSIG_WORDS) { case 4: set.sig[3] = seta.sig[6] + (((long)seta.sig[7]) << 32); case 3: set.sig[2] = seta.sig[4] + (((long)seta.sig[5]) << 32); case 2: set.sig[1] = seta.sig[2] + (((long)seta.sig[3]) << 32); case 1: set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32); } sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sighand->siglock); current->blocked = set; recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); return; segv: force_sig(SIGSEGV, current); } /* Checks if the fp is valid */ static int invalid_frame_pointer(void __user *fp, int fplen) { if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen) return 1; return 0; } static void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize) { unsigned long sp; regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; sp = regs->u_regs[UREG_FP]; /* This is the X/Open sanctioned signal stack switching. */ if (sa->sa_flags & SA_ONSTACK) { if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7)) sp = current->sas_ss_sp + current->sas_ss_size; } return (void __user *)(sp - framesize); } static void setup_frame32(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info) { struct signal_sframe32 __user *sframep; struct sigcontext32 __user *sc; unsigned int seta[_COMPAT_NSIG_WORDS]; int err = 0; void __user *sig_address; int sig_code; unsigned long pc = regs->tpc; unsigned long npc = regs->tnpc; unsigned int psr; if (test_thread_flag(TIF_32BIT)) { pc &= 0xffffffff; npc &= 0xffffffff; } synchronize_user_stack(); save_and_clear_fpu(); sframep = (struct signal_sframe32 __user *) get_sigframe(sa, regs, SF_ALIGNEDSZ); if (invalid_frame_pointer(sframep, sizeof(*sframep))){ /* Don't change signal code and address, so that * post mortem debuggers can have a look. */ do_exit(SIGILL); } sc = &sframep->sig_context; /* We've already made sure frame pointer isn't in kernel space... */ err = __put_user((sas_ss_flags(regs->u_regs[UREG_FP]) == SS_ONSTACK), &sc->sigc_onstack); switch (_NSIG_WORDS) { case 4: seta[7] = (oldset->sig[3] >> 32); seta[6] = oldset->sig[3]; case 3: seta[5] = (oldset->sig[2] >> 32); seta[4] = oldset->sig[2]; case 2: seta[3] = (oldset->sig[1] >> 32); seta[2] = oldset->sig[1]; case 1: seta[1] = (oldset->sig[0] >> 32); seta[0] = oldset->sig[0]; } err |= __put_user(seta[0], &sc->sigc_mask); err |= __copy_to_user(sframep->extramask, seta + 1, (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); err |= __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp); err |= __put_user(pc, &sc->sigc_pc); err |= __put_user(npc, &sc->sigc_npc); psr = tstate_to_psr(regs->tstate); if (current_thread_info()->fpsaved[0] & FPRS_FEF) psr |= PSR_EF; err |= __put_user(psr, &sc->sigc_psr); err |= __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1); err |= __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0); err |= __put_user(get_thread_wsaved(), &sc->sigc_oswins); err |= copy_in_user((u32 __user *)sframep, (u32 __user *)(regs->u_regs[UREG_FP]), sizeof(struct reg_window32)); set_thread_wsaved(0); /* So process is allowed to execute. */ err |= __put_user(signr, &sframep->sig_num); sig_address = NULL; sig_code = 0; if (SI_FROMKERNEL (info) && (info->si_code & __SI_MASK) == __SI_FAULT) { sig_address = info->si_addr; switch (signr) { case SIGSEGV: switch (info->si_code) { case SEGV_MAPERR: sig_code = SUBSIG_NOMAPPING; break; default: sig_code = SUBSIG_PROTECTION; break; } break; case SIGILL: switch (info->si_code) { case ILL_ILLOPC: sig_code = SUBSIG_ILLINST; break; case ILL_PRVOPC: sig_code = SUBSIG_PRIVINST; break; case ILL_ILLTRP: sig_code = SUBSIG_BADTRAP(info->si_trapno); break; default: sig_code = SUBSIG_STACK; break; } break; case SIGFPE: switch (info->si_code) { case FPE_INTDIV: sig_code = SUBSIG_IDIVZERO; break; case FPE_INTOVF: sig_code = SUBSIG_FPINTOVFL; break; case FPE_FLTDIV: sig_code = SUBSIG_FPDIVZERO; break; case FPE_FLTOVF: sig_code = SUBSIG_FPOVFLOW; break; case FPE_FLTUND: sig_code = SUBSIG_FPUNFLOW; break; case FPE_FLTRES: sig_code = SUBSIG_FPINEXACT; break; case FPE_FLTINV: sig_code = SUBSIG_FPOPERROR; break; default: sig_code = SUBSIG_FPERROR; break; } break; case SIGBUS: switch (info->si_code) { case BUS_ADRALN: sig_code = SUBSIG_ALIGNMENT; break; case BUS_ADRERR: sig_code = SUBSIG_MISCERROR; break; default: sig_code = SUBSIG_BUSTIMEOUT; break; } break; case SIGEMT: switch (info->si_code) { case EMT_TAGOVF: sig_code = SUBSIG_TAG; break; } break; case SIGSYS: if (info->si_code == (__SI_FAULT|0x100)) { /* See sys_sunos32.c */ sig_code = info->si_trapno; break; } default: sig_address = NULL; } } err |= __put_user(ptr_to_compat(sig_address), &sframep->sig_address); err |= __put_user(sig_code, &sframep->sig_code); err |= __put_user(ptr_to_compat(sc), &sframep->sig_scptr); if (err) goto sigsegv; regs->u_regs[UREG_FP] = (unsigned long) sframep; regs->tpc = (unsigned long) sa->sa_handler; regs->tnpc = (regs->tpc + 4); if (test_thread_flag(TIF_32BIT)) { regs->tpc &= 0xffffffff; regs->tnpc &= 0xffffffff; } return; sigsegv: force_sigsegv(signr, current); } static int save_fpu_state32(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) { unsigned long *fpregs = current_thread_info()->fpregs; unsigned long fprs; int err = 0; fprs = current_thread_info()->fpsaved[0]; if (fprs & FPRS_DL) err |= copy_to_user(&fpu->si_float_regs[0], fpregs, (sizeof(unsigned int) * 32)); if (fprs & FPRS_DU) err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16, (sizeof(unsigned int) * 32)); err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr); err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr); err |= __put_user(fprs, &fpu->si_fprs); return err; } static void new_setup_frame32(struct k_sigaction *ka, struct pt_regs *regs, int signo, sigset_t *oldset) { struct new_signal_frame32 __user *sf; int sigframe_size; u32 psr; int i, err; unsigned int seta[_COMPAT_NSIG_WORDS]; /* 1. Make sure everything is clean */ synchronize_user_stack(); save_and_clear_fpu(); sigframe_size = NF_ALIGNEDSZ; if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) sigframe_size -= sizeof(__siginfo_fpu_t); sf = (struct new_signal_frame32 __user *) get_sigframe(&ka->sa, regs, sigframe_size); if (invalid_frame_pointer(sf, sigframe_size)) goto sigill; if (get_thread_wsaved() != 0) goto sigill; /* 2. Save the current process state */ if (test_thread_flag(TIF_32BIT)) { regs->tpc &= 0xffffffff; regs->tnpc &= 0xffffffff; } err = put_user(regs->tpc, &sf->info.si_regs.pc); err |= __put_user(regs->tnpc, &sf->info.si_regs.npc); err |= __put_user(regs->y, &sf->info.si_regs.y); psr = tstate_to_psr(regs->tstate); if (current_thread_info()->fpsaved[0] & FPRS_FEF) psr |= PSR_EF; err |= __put_user(psr, &sf->info.si_regs.psr); for (i = 0; i < 16; i++) err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); for (i = 1; i < 16; i++) err |= __put_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, &sf->v8plus.asi); if (psr & PSR_EF) { err |= save_fpu_state32(regs, &sf->fpu_state); err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save); } else { err |= __put_user(0, &sf->fpu_save); } switch (_NSIG_WORDS) { case 4: seta[7] = (oldset->sig[3] >> 32); seta[6] = oldset->sig[3]; case 3: seta[5] = (oldset->sig[2] >> 32); seta[4] = oldset->sig[2]; case 2: seta[3] = (oldset->sig[1] >> 32); seta[2] = oldset->sig[1]; case 1: seta[1] = (oldset->sig[0] >> 32); seta[0] = oldset->sig[0]; } err |= __put_user(seta[0], &sf->info.si_mask); err |= __copy_to_user(sf->extramask, seta + 1, (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); err |= copy_in_user((u32 __user *)sf, (u32 __user *)(regs->u_regs[UREG_FP]), sizeof(struct reg_window32)); if (err) goto sigsegv; /* 3. signal handler back-trampoline and parameters */ regs->u_regs[UREG_FP] = (unsigned long) sf; regs->u_regs[UREG_I0] = signo; regs->u_regs[UREG_I1] = (unsigned long) &sf->info; regs->u_regs[UREG_I2] = (unsigned long) &sf->info; /* 4. signal handler */ regs->tpc = (unsigned long) ka->sa.sa_handler; regs->tnpc = (regs->tpc + 4); if (test_thread_flag(TIF_32BIT)) { regs->tpc &= 0xffffffff; regs->tnpc &= 0xffffffff; } /* 5. return to kernel instructions */ if (ka->ka_restorer) { regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; } else { /* Flush instruction space. */ unsigned long address = ((unsigned long)&(sf->insns[0])); pgd_t *pgdp = pgd_offset(current->mm, address); pud_t *pudp = pud_offset(pgdp, address); pmd_t *pmdp = pmd_offset(pudp, address); pte_t *ptep; pte_t pte; regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/ err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/ if (err) goto sigsegv; preempt_disable(); ptep = pte_offset_map(pmdp, address); pte = *ptep; if (pte_present(pte)) { unsigned long page = (unsigned long) page_address(pte_page(pte)); wmb(); __asm__ __volatile__("flush %0 + %1" : /* no outputs */ : "r" (page), "r" (address & (PAGE_SIZE - 1)) : "memory"); } pte_unmap(ptep); preempt_enable(); } return; sigill: do_exit(SIGILL); sigsegv: force_sigsegv(signo, current); } /* Setup a Solaris stack frame */ static void setup_svr4_frame32(struct sigaction *sa, unsigned long pc, unsigned long npc, struct pt_regs *regs, int signr, sigset_t *oldset) { svr4_signal_frame_t __user *sfp; svr4_gregset_t __user *gr; svr4_siginfo_t __user *si; svr4_mcontext_t __user *mc; svr4_gwindows_t __user *gw; svr4_ucontext_t __user *uc; svr4_sigset_t setv; unsigned int psr; int i, err; synchronize_user_stack(); save_and_clear_fpu(); regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; sfp = (svr4_signal_frame_t __user *) get_sigframe(sa, regs, sizeof(struct reg_window32) + SVR4_SF_ALIGNED); if (invalid_frame_pointer(sfp, sizeof(*sfp))) do_exit(SIGILL); /* Start with a clean frame pointer and fill it */ err = clear_user(sfp, sizeof(*sfp)); /* Setup convenience variables */ si = &sfp->si; uc = &sfp->uc; gw = &sfp->gw; mc = &uc->mcontext; gr = &mc->greg; /* FIXME: where am I supposed to put this? * sc->sigc_onstack = old_status; * anyways, it does not look like it is used for anything at all. */ setv.sigbits[0] = oldset->sig[0]; setv.sigbits[1] = (oldset->sig[0] >> 32); if (_NSIG_WORDS >= 2) { setv.sigbits[2] = oldset->sig[1]; setv.sigbits[3] = (oldset->sig[1] >> 32); err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t)); } else err |= __copy_to_user(&uc->sigmask, &setv, 2 * sizeof(unsigned int)); /* Store registers */ if (test_thread_flag(TIF_32BIT)) { regs->tpc &= 0xffffffff; regs->tnpc &= 0xffffffff; } err |= __put_user(regs->tpc, &((*gr)[SVR4_PC])); err |= __put_user(regs->tnpc, &((*gr)[SVR4_NPC])); psr = tstate_to_psr(regs->tstate); if (current_thread_info()->fpsaved[0] & FPRS_FEF) psr |= PSR_EF; err |= __put_user(psr, &((*gr)[SVR4_PSR])); err |= __put_user(regs->y, &((*gr)[SVR4_Y])); /* Copy g[1..7] and o[0..7] registers */ for (i = 0; i < 7; i++) err |= __put_user(regs->u_regs[UREG_G1+i], (&(*gr)[SVR4_G1])+i); for (i = 0; i < 8; i++) err |= __put_user(regs->u_regs[UREG_I0+i], (&(*gr)[SVR4_O0])+i); /* Setup sigaltstack */ err |= __put_user(current->sas_ss_sp, &uc->stack.sp); err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags); err |= __put_user(current->sas_ss_size, &uc->stack.size); /* Save the currently window file: */ /* 1. Link sfp->uc->gwins to our windows */ err |= __put_user(ptr_to_compat(gw), &mc->gwin); /* 2. Number of windows to restore at setcontext (): */ err |= __put_user(get_thread_wsaved(), &gw->count); /* 3. We just pay attention to the gw->count field on setcontext */ set_thread_wsaved(0); /* So process is allowed to execute. */ /* Setup the signal information. Solaris expects a bunch of * information to be passed to the signal handler, we don't provide * that much currently, should use siginfo. */ err |= __put_user(signr, &si->siginfo.signo); err |= __put_user(SVR4_SINOINFO, &si->siginfo.code); if (err) goto sigsegv; regs->u_regs[UREG_FP] = (unsigned long) sfp; regs->tpc = (unsigned long) sa->sa_handler; regs->tnpc = (regs->tpc + 4); if (test_thread_flag(TIF_32BIT)) { regs->tpc &= 0xffffffff; regs->tnpc &= 0xffffffff; } /* Arguments passed to signal handler */ if (regs->u_regs[14]){ struct reg_window32 __user *rw = (struct reg_window32 __user *) (regs->u_regs[14] & 0x00000000ffffffffUL); err |= __put_user(signr, &rw->ins[0]); err |= __put_user((u64)si, &rw->ins[1]); err |= __put_user((u64)uc, &rw->ins[2]); err |= __put_user((u64)sfp, &rw->ins[6]); /* frame pointer */ if (err) goto sigsegv; regs->u_regs[UREG_I0] = signr; regs->u_regs[UREG_I1] = (u32)(u64) si; regs->u_regs[UREG_I2] = (u32)(u64) uc; } return; sigsegv: force_sigsegv(signr, current); } asmlinkage int svr4_getcontext(svr4_ucontext_t __user *uc, struct pt_regs *regs) { svr4_gregset_t __user *gr; svr4_mcontext_t __user *mc; svr4_sigset_t setv; int i, err; u32 psr; synchronize_user_stack(); save_and_clear_fpu(); if (get_thread_wsaved()) do_exit(SIGSEGV); err = clear_user(uc, sizeof(*uc)); /* Setup convenience variables */ mc = &uc->mcontext; gr = &mc->greg; setv.sigbits[0] = current->blocked.sig[0]; setv.sigbits[1] = (current->blocked.sig[0] >> 32); if (_NSIG_WORDS >= 2) { setv.sigbits[2] = current->blocked.sig[1]; setv.sigbits[3] = (current->blocked.sig[1] >> 32); err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t)); } else err |= __copy_to_user(&uc->sigmask, &setv, 2 * sizeof(unsigned)); /* Store registers */ if (test_thread_flag(TIF_32BIT)) { regs->tpc &= 0xffffffff; regs->tnpc &= 0xffffffff; } err |= __put_user(regs->tpc, &uc->mcontext.greg[SVR4_PC]); err |= __put_user(regs->tnpc, &uc->mcontext.greg[SVR4_NPC]); psr = tstate_to_psr(regs->tstate) & ~PSR_EF; if (current_thread_info()->fpsaved[0] & FPRS_FEF) psr |= PSR_EF; err |= __put_user(psr, &uc->mcontext.greg[SVR4_PSR]); err |= __put_user(regs->y, &uc->mcontext.greg[SVR4_Y]); /* Copy g[1..7] and o[0..7] registers */ for (i = 0; i < 7; i++) err |= __put_user(regs->u_regs[UREG_G1+i], (&(*gr)[SVR4_G1])+i); for (i = 0; i < 8; i++) err |= __put_user(regs->u_regs[UREG_I0+i], (&(*gr)[SVR4_O0])+i); /* Setup sigaltstack */ err |= __put_user(current->sas_ss_sp, &uc->stack.sp); err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags); err |= __put_user(current->sas_ss_size, &uc->stack.size); /* The register file is not saved * we have already stuffed all of it with sync_user_stack */ return (err ? -EFAULT : 0); } /* Set the context for a svr4 application, this is Solaris way to sigreturn */ asmlinkage int svr4_setcontext(svr4_ucontext_t __user *c, struct pt_regs *regs) { svr4_gregset_t __user *gr; mm_segment_t old_fs; u32 pc, npc, psr, u_ss_sp; sigset_t set; svr4_sigset_t setv; int i, err; stack_t st; /* Fixme: restore windows, or is this already taken care of in * svr4_setup_frame when sync_user_windows is done? */ flush_user_windows(); if (get_thread_wsaved()) goto sigsegv; if (((unsigned long) c) & 3){ printk("Unaligned structure passed\n"); goto sigsegv; } if (!__access_ok(c, sizeof(*c))) { /* Miguel, add nice debugging msg _here_. ;-) */ goto sigsegv; } /* Check for valid PC and nPC */ gr = &c->mcontext.greg; err = __get_user(pc, &((*gr)[SVR4_PC])); err |= __get_user(npc, &((*gr)[SVR4_NPC])); if ((pc | npc) & 3) goto sigsegv; /* Retrieve information from passed ucontext */ /* note that nPC is ored a 1, this is used to inform entry.S */ /* that we don't want it to mess with our PC and nPC */ err |= copy_from_user(&setv, &c->sigmask, sizeof(svr4_sigset_t)); set.sig[0] = setv.sigbits[0] | (((long)setv.sigbits[1]) << 32); if (_NSIG_WORDS >= 2) set.sig[1] = setv.sigbits[2] | (((long)setv.sigbits[3]) << 32); err |= __get_user(u_ss_sp, &c->stack.sp); st.ss_sp = compat_ptr(u_ss_sp); err |= __get_user(st.ss_flags, &c->stack.flags); err |= __get_user(st.ss_size, &c->stack.size); if (err) goto sigsegv; /* It is more difficult to avoid calling this function than to call it and ignore errors. */ old_fs = get_fs(); set_fs(KERNEL_DS); do_sigaltstack((stack_t __user *) &st, NULL, regs->u_regs[UREG_I6]); set_fs(old_fs); sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sighand->siglock); current->blocked = set; recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); regs->tpc = pc; regs->tnpc = npc | 1; if (test_thread_flag(TIF_32BIT)) { regs->tpc &= 0xffffffff; regs->tnpc &= 0xffffffff; } err |= __get_user(regs->y, &((*gr)[SVR4_Y])); err |= __get_user(psr, &((*gr)[SVR4_PSR])); regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); regs->tstate |= psr_to_tstate_icc(psr); /* Restore g[1..7] and o[0..7] registers */ for (i = 0; i < 7; i++) err |= __get_user(regs->u_regs[UREG_G1+i], (&(*gr)[SVR4_G1])+i); for (i = 0; i < 8; i++) err |= __get_user(regs->u_regs[UREG_I0+i], (&(*gr)[SVR4_O0])+i); if (err) goto sigsegv; return -EINTR; sigsegv: return -EFAULT; } static void setup_rt_frame32(struct k_sigaction *ka, struct pt_regs *regs, unsigned long signr, sigset_t *oldset, siginfo_t *info) { struct rt_signal_frame32 __user *sf; int sigframe_size; u32 psr; int i, err; compat_sigset_t seta; /* 1. Make sure everything is clean */ synchronize_user_stack(); save_and_clear_fpu(); sigframe_size = RT_ALIGNEDSZ; if (!(current_thread_info()->fpsaved[0] & FPRS_FEF)) sigframe_size -= sizeof(__siginfo_fpu_t); sf = (struct rt_signal_frame32 __user *) get_sigframe(&ka->sa, regs, sigframe_size); if (invalid_frame_pointer(sf, sigframe_size)) goto sigill; if (get_thread_wsaved() != 0) goto sigill; /* 2. Save the current process state */ if (test_thread_flag(TIF_32BIT)) { regs->tpc &= 0xffffffff; regs->tnpc &= 0xffffffff; } err = put_user(regs->tpc, &sf->regs.pc); err |= __put_user(regs->tnpc, &sf->regs.npc); err |= __put_user(regs->y, &sf->regs.y); psr = tstate_to_psr(regs->tstate); if (current_thread_info()->fpsaved[0] & FPRS_FEF) psr |= PSR_EF; err |= __put_user(psr, &sf->regs.psr); for (i = 0; i < 16; i++) err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]); err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); for (i = 1; i < 16; i++) err |= __put_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, &sf->v8plus.asi); if (psr & PSR_EF) { err |= save_fpu_state32(regs, &sf->fpu_state); err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save); } else { err |= __put_user(0, &sf->fpu_save); } /* Update the siginfo structure. */ err |= copy_siginfo_to_user32(&sf->info, info); /* Setup sigaltstack */ err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp); err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); err |= __put_user(current->sas_ss_size, &sf->stack.ss_size); switch (_NSIG_WORDS) { case 4: seta.sig[7] = (oldset->sig[3] >> 32); seta.sig[6] = oldset->sig[3]; case 3: seta.sig[5] = (oldset->sig[2] >> 32); seta.sig[4] = oldset->sig[2]; case 2: seta.sig[3] = (oldset->sig[1] >> 32); seta.sig[2] = oldset->sig[1]; case 1: seta.sig[1] = (oldset->sig[0] >> 32); seta.sig[0] = oldset->sig[0]; } err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t)); err |= copy_in_user((u32 __user *)sf, (u32 __user *)(regs->u_regs[UREG_FP]), sizeof(struct reg_window32)); if (err) goto sigsegv; /* 3. signal handler back-trampoline and parameters */ regs->u_regs[UREG_FP] = (unsigned long) sf; regs->u_regs[UREG_I0] = signr; regs->u_regs[UREG_I1] = (unsigned long) &sf->info; regs->u_regs[UREG_I2] = (unsigned long) &sf->regs; /* 4. signal handler */ regs->tpc = (unsigned long) ka->sa.sa_handler; regs->tnpc = (regs->tpc + 4); if (test_thread_flag(TIF_32BIT)) { regs->tpc &= 0xffffffff; regs->tnpc &= 0xffffffff; } /* 5. return to kernel instructions */ if (ka->ka_restorer) regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; else { /* Flush instruction space. */ unsigned long address = ((unsigned long)&(sf->insns[0])); pgd_t *pgdp = pgd_offset(current->mm, address); pud_t *pudp = pud_offset(pgdp, address); pmd_t *pmdp = pmd_offset(pudp, address); pte_t *ptep; regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); /* mov __NR_rt_sigreturn, %g1 */ err |= __put_user(0x82102065, &sf->insns[0]); /* t 0x10 */ err |= __put_user(0x91d02010, &sf->insns[1]); if (err) goto sigsegv; preempt_disable(); ptep = pte_offset_map(pmdp, address); if (pte_present(*ptep)) { unsigned long page = (unsigned long) page_address(pte_page(*ptep)); wmb(); __asm__ __volatile__("flush %0 + %1" : /* no outputs */ : "r" (page), "r" (address & (PAGE_SIZE - 1)) : "memory"); } pte_unmap(ptep); preempt_enable(); } return; sigill: do_exit(SIGILL); sigsegv: force_sigsegv(signr, current); } static inline void handle_signal32(unsigned long signr, struct k_sigaction *ka, siginfo_t *info, sigset_t *oldset, struct pt_regs *regs, int svr4_signal) { if (svr4_signal) setup_svr4_frame32(&ka->sa, regs->tpc, regs->tnpc, regs, signr, oldset); else { if (ka->sa.sa_flags & SA_SIGINFO) setup_rt_frame32(ka, regs, signr, oldset, info); else if (test_thread_flag(TIF_NEWSIGNALS)) new_setup_frame32(ka, regs, signr, oldset); else setup_frame32(&ka->sa, regs, signr, oldset, info); } spin_lock_irq(¤t->sighand->siglock); sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); if (!(ka->sa.sa_flags & SA_NOMASK)) sigaddset(¤t->blocked,signr); recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); } static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs, struct sigaction *sa) { switch (regs->u_regs[UREG_I0]) { case ERESTART_RESTARTBLOCK: case ERESTARTNOHAND: no_system_call_restart: regs->u_regs[UREG_I0] = EINTR; regs->tstate |= TSTATE_ICARRY; break; case ERESTARTSYS: if (!(sa->sa_flags & SA_RESTART)) goto no_system_call_restart; /* fallthrough */ case ERESTARTNOINTR: regs->u_regs[UREG_I0] = orig_i0; regs->tpc -= 4; regs->tnpc -= 4; } } /* 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. */ void do_signal32(sigset_t *oldset, struct pt_regs * regs, unsigned long orig_i0, int restart_syscall) { siginfo_t info; struct signal_deliver_cookie cookie; struct k_sigaction ka; int signr; int svr4_signal = current->personality == PER_SVR4; cookie.restart_syscall = restart_syscall; cookie.orig_i0 = orig_i0; signr = get_signal_to_deliver(&info, &ka, regs, &cookie); if (signr > 0) { if (cookie.restart_syscall) syscall_restart32(orig_i0, regs, &ka.sa); handle_signal32(signr, &ka, &info, oldset, regs, svr4_signal); /* a signal was successfully delivered; the saved * sigmask will have been stored in the signal frame, * and will be restored by sigreturn, so we can simply * clear the TIF_RESTORE_SIGMASK flag. */ if (test_thread_flag(TIF_RESTORE_SIGMASK)) clear_thread_flag(TIF_RESTORE_SIGMASK); return; } if (cookie.restart_syscall && (regs->u_regs[UREG_I0] == ERESTARTNOHAND || regs->u_regs[UREG_I0] == ERESTARTSYS || regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { /* replay the system call when we are done */ regs->u_regs[UREG_I0] = cookie.orig_i0; regs->tpc -= 4; regs->tnpc -= 4; } if (cookie.restart_syscall && regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { regs->u_regs[UREG_G1] = __NR_restart_syscall; regs->tpc -= 4; regs->tnpc -= 4; } /* if there's no signal to deliver, we just put the saved sigmask * back */ if (test_thread_flag(TIF_RESTORE_SIGMASK)) { clear_thread_flag(TIF_RESTORE_SIGMASK); sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); } } struct sigstack32 { u32 the_stack; int cur_status; }; asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp) { struct sigstack32 __user *ssptr = (struct sigstack32 __user *)((unsigned long)(u_ssptr)); struct sigstack32 __user *ossptr = (struct sigstack32 __user *)((unsigned long)(u_ossptr)); int ret = -EFAULT; /* First see if old state is wanted. */ if (ossptr) { if (put_user(current->sas_ss_sp + current->sas_ss_size, &ossptr->the_stack) || __put_user(on_sig_stack(sp), &ossptr->cur_status)) goto out; } /* Now see if we want to update the new state. */ if (ssptr) { u32 ss_sp; if (get_user(ss_sp, &ssptr->the_stack)) goto out; /* If the current stack was set with sigaltstack, don't * swap stacks while we are on it. */ ret = -EPERM; if (current->sas_ss_sp && on_sig_stack(sp)) goto out; /* Since we don't know the extent of the stack, and we don't * track onstack-ness, but rather calculate it, we must * presume a size. Ho hum this interface is lossy. */ current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; current->sas_ss_size = SIGSTKSZ; } ret = 0; out: return ret; } asmlinkage long do_sys32_sigaltstack(u32 ussa, u32 uossa, unsigned long sp) { stack_t uss, uoss; u32 u_ss_sp = 0; int ret; mm_segment_t old_fs; stack_t32 __user *uss32 = compat_ptr(ussa); stack_t32 __user *uoss32 = compat_ptr(uossa); if (ussa && (get_user(u_ss_sp, &uss32->ss_sp) || __get_user(uss.ss_flags, &uss32->ss_flags) || __get_user(uss.ss_size, &uss32->ss_size))) return -EFAULT; uss.ss_sp = compat_ptr(u_ss_sp); old_fs = get_fs(); set_fs(KERNEL_DS); ret = do_sigaltstack(ussa ? (stack_t __user *) &uss : NULL, uossa ? (stack_t __user *) &uoss : NULL, sp); set_fs(old_fs); if (!ret && uossa && (put_user(ptr_to_compat(uoss.ss_sp), &uoss32->ss_sp) || __put_user(uoss.ss_flags, &uoss32->ss_flags) || __put_user(uoss.ss_size, &uoss32->ss_size))) return -EFAULT; return ret; }