/* $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 <linux/sched.h> #include <linux/kernel.h> #include <linux/signal.h> #include <linux/errno.h> #include <linux/wait.h> #include <linux/ptrace.h> #include <linux/unistd.h> #include <linux/mm.h> #include <linux/tty.h> #include <linux/smp_lock.h> #include <linux/binfmts.h> #include <asm/uaccess.h> #include <asm/bitops.h> #include <asm/ptrace.h> #include <asm/svr4.h> #include <asm/pgtable.h> #include <asm/psrcompat.h> #include <asm/fpumacro.h> #include <asm/visasm.h> #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) int do_signal32(sigset_t *oldset, struct pt_regs *regs, unsigned long orig_o0, int ret_from_syscall); /* This turned off for production... */ /* #define DEBUG_SIGNALS 1 */ /* #define DEBUG_SIGNALS_TRACE 1 */ /* #define DEBUG_SIGNALS_MAPS 1 */ /* #define DEBUG_SIGNALS_TLB 1 */ /* 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 extramask[_NSIG_WORDS32 - 1]; }; /* * 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 extramask[_NSIG_WORDS32 - 1]; unsigned 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; }; struct rt_signal_frame32 { struct sparc_stackf32 ss; siginfo_t32 info; struct pt_regs32 regs; sigset_t32 mask; /* __siginfo_fpu32_t * */ u32 fpu_save; unsigned int insns [2]; stack_t32 stack; unsigned 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(siginfo_t32 *to, siginfo_t *from) { int err; if (!access_ok (VERIFY_WRITE, to, sizeof(siginfo_t32))) 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_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: case __SI_POLL >> 16: err |= __put_user(from->si_trapno, &to->si_trapno); err |= __put_user((long)from->si_addr, &to->si_addr); break; /* case __SI_RT: This is not generated by the kernel as of now. */ } } return err; } /* * atomically swap in the new signal mask, and wait for a signal. * This is really tricky on the Sparc, watch out... */ asmlinkage void _sigpause32_common(old_sigset_t32 set, struct pt_regs *regs) { sigset_t saveset; set &= _BLOCKABLE; spin_lock_irq(¤t->sigmask_lock); saveset = current->blocked; siginitset(¤t->blocked, set); recalc_sigpending(); spin_unlock_irq(¤t->sigmask_lock); regs->tpc = regs->tnpc; regs->tnpc += 4; if (test_thread_flag(TIF_32BIT)) { regs->tpc &= 0xffffffff; regs->tnpc &= 0xffffffff; } /* Condition codes and return value where set here for sigpause, * and so got used by setup_frame, which again causes sigreturn() * to return -EINTR. */ while (1) { current->state = TASK_INTERRUPTIBLE; schedule(); /* * Return -EINTR and set condition code here, * so the interrupted system call actually returns * these. */ regs->tstate |= TSTATE_ICARRY; regs->u_regs[UREG_I0] = EINTR; if (do_signal32(&saveset, regs, 0, 0)) return; } } asmlinkage void do_rt_sigsuspend32(u32 uset, size_t sigsetsize, struct pt_regs *regs) { sigset_t oldset, set; sigset_t32 set32; /* XXX: Don't preclude handling different sized sigset_t's. */ if (((__kernel_size_t32)sigsetsize) != sizeof(sigset_t)) { regs->tstate |= TSTATE_ICARRY; regs->u_regs[UREG_I0] = EINVAL; return; } if (copy_from_user(&set32, (void *)(long)uset, sizeof(set32))) { regs->tstate |= TSTATE_ICARRY; regs->u_regs[UREG_I0] = EFAULT; return; } switch (_NSIG_WORDS) { case 4: set.sig[3] = set32.sig[6] + (((long)set32.sig[7]) << 32); case 3: set.sig[2] = set32.sig[4] + (((long)set32.sig[5]) << 32); case 2: set.sig[1] = set32.sig[2] + (((long)set32.sig[3]) << 32); case 1: set.sig[0] = set32.sig[0] + (((long)set32.sig[1]) << 32); } sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sigmask_lock); oldset = current->blocked; current->blocked = set; recalc_sigpending(); spin_unlock_irq(¤t->sigmask_lock); regs->tpc = regs->tnpc; regs->tnpc += 4; if (test_thread_flag(TIF_32BIT)) { regs->tpc &= 0xffffffff; regs->tnpc &= 0xffffffff; } /* Condition codes and return value where set here for sigpause, * and so got used by setup_frame, which again causes sigreturn() * to return -EINTR. */ while (1) { current->state = TASK_INTERRUPTIBLE; schedule(); /* * Return -EINTR and set condition code here, * so the interrupted system call actually returns * these. */ regs->tstate |= TSTATE_ICARRY; regs->u_regs[UREG_I0] = EINTR; if (do_signal32(&oldset, regs, 0, 0)) return; } } static inline int restore_fpu_state32(struct pt_regs *regs, __siginfo_fpu_t *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 *sf; unsigned int psr; unsigned pc, npc, fpu_save; sigset_t set; unsigned seta[_NSIG_WORDS32]; int err, i; regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; sf = (struct new_signal_frame32 *) regs->u_regs [UREG_FP]; /* 1. Make sure we are not getting garbage from the user */ if (verify_area (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) { for (i = UREG_G1; i <= UREG_I7; i++) err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); } } /* 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, (_NSIG_WORDS32 - 1) * sizeof(unsigned)); 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->sigmask_lock); current->blocked = set; recalc_sigpending(); spin_unlock_irq(¤t->sigmask_lock); return; segv: do_exit(SIGSEGV); } asmlinkage void do_sigreturn32(struct pt_regs *regs) { struct sigcontext32 *scptr; unsigned pc, npc, psr; sigset_t set; unsigned seta[_NSIG_WORDS32]; int err; synchronize_user_stack(); if (test_thread_flag(TIF_NEWSIGNALS)) return do_new_sigreturn32(regs); scptr = (struct sigcontext32 *) (regs->u_regs[UREG_I0] & 0x00000000ffffffffUL); /* Check sanity of the user arg. */ if (verify_area(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, (_NSIG_WORDS32 - 1) * sizeof(unsigned)); 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->sigmask_lock); current->blocked = set; recalc_sigpending(); spin_unlock_irq(¤t->sigmask_lock); 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: do_exit(SIGSEGV); } asmlinkage void do_rt_sigreturn32(struct pt_regs *regs) { struct rt_signal_frame32 *sf; unsigned int psr; unsigned pc, npc, fpu_save; mm_segment_t old_fs; sigset_t set; sigset_t32 seta; stack_t st; int err, i; synchronize_user_stack(); regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; sf = (struct rt_signal_frame32 *) regs->u_regs [UREG_FP]; /* 1. Make sure we are not getting garbage from the user */ if (verify_area (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) { for (i = UREG_G1; i <= UREG_I7; i++) err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); } } /* 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(sigset_t32)); err |= __get_user((long)st.ss_sp, &sf->stack.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(&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->sigmask_lock); current->blocked = set; recalc_sigpending(); spin_unlock_irq(¤t->sigmask_lock); return; segv: do_exit(SIGSEGV); } /* Checks if the fp is valid */ static int invalid_frame_pointer(void *fp, int fplen) { if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen) return 1; return 0; } static inline void *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 *)(sp - framesize); } static void setup_frame32(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info) { struct signal_sframe32 *sframep; struct sigcontext32 *sc; unsigned seta[_NSIG_WORDS32]; int err = 0; void *sig_address; int sig_code; unsigned long pc = regs->tpc; unsigned long npc = regs->tnpc; #if 0 int window = 0; #endif unsigned psr; if (test_thread_flag(TIF_32BIT)) { pc &= 0xffffffff; npc &= 0xffffffff; } synchronize_user_stack(); save_and_clear_fpu(); sframep = (struct signal_sframe32 *)get_sigframe(sa, regs, SF_ALIGNEDSZ); if (invalid_frame_pointer (sframep, sizeof(*sframep))){ #ifdef DEBUG_SIGNALS /* fills up the console logs during crashme runs, yuck... */ printk("%s [%d]: User has trashed signal stack\n", current->comm, current->pid); printk("Sigstack ptr %p handler at pc<%016lx> for sig<%d>\n", sframep, pc, signr); #endif /* 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, (_NSIG_WORDS32 - 1) * sizeof(unsigned)); 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); #if 0 /* w_saved is not currently used... */ if (get_thread_wsaved()) for (window = 0; window < get_thread_wsaved(); window++) { sc->sigc_spbuf[window] = (char *) current_thread_info()->rwbuf_stkptrs[window]; err |= copy_to_user(&sc->sigc_wbuf[window], ¤t_thread_info()->reg_window[window], sizeof(struct reg_window)); } else #endif err |= copy_in_user((u32 *)sframep, (u32 *)(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((long)sig_address, &sframep->sig_address); err |= __put_user(sig_code, &sframep->sig_code); err |= __put_user((u64)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: do_exit(SIGSEGV); } static inline int save_fpu_state32(struct pt_regs *regs, __siginfo_fpu_t *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 inline void new_setup_frame32(struct k_sigaction *ka, struct pt_regs *regs, int signo, sigset_t *oldset) { struct new_signal_frame32 *sf; int sigframe_size; u32 psr; int i, err; unsigned seta[_NSIG_WORDS32]; /* 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 *)get_sigframe(&ka->sa, regs, sigframe_size); if (invalid_frame_pointer (sf, sigframe_size)) { #ifdef DEBUG_SIGNALS printk("new_setup_frame32(%s:%d): invalid_frame_pointer(%p, %d)\n", current->comm, current->pid, sf, sigframe_size); #endif goto sigill; } if (get_thread_wsaved() != 0) { #ifdef DEBUG_SIGNALS printk ("%s[%d]: Invalid user stack frame for " "signal delivery.\n", current->comm, current->pid); #endif 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]); 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, (_NSIG_WORDS32 - 1) * sizeof(unsigned)); err |= copy_in_user((u32 *)sf, (u32 *)(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; /* 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); pmd_t *pmdp = pmd_offset(pgdp, address); pte_t *ptep; 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); if (pte_present(*ptep)) { unsigned long page = (unsigned long) page_address(pte_page(*ptep)); __asm__ __volatile__( " membar #StoreStore\n" " flush %0 + %1" : : "r" (page), "r" (address & (PAGE_SIZE - 1)) : "memory"); } pte_unmap(ptep); preempt_enable(); } return; sigill: do_exit(SIGILL); sigsegv: do_exit(SIGSEGV); } /* Setup a Solaris stack frame */ static inline 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 *sfp; svr4_gregset_t *gr; svr4_siginfo_t *si; svr4_mcontext_t *mc; svr4_gwindows_t *gw; svr4_ucontext_t *uc; svr4_sigset_t setv; #if 0 int window = 0; #endif unsigned psr; int i, err; synchronize_user_stack(); save_and_clear_fpu(); regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; sfp = (svr4_signal_frame_t *) get_sigframe(sa, regs, REGWIN_SZ + SVR4_SF_ALIGNED); if (invalid_frame_pointer (sfp, sizeof (*sfp))){ #ifdef DEBUG_SIGNALS printk ("Invalid stack frame\n"); #endif 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)); /* 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((u32)(long)gw, &mc->gwin); /* 2. Number of windows to restore at setcontext (): */ err |= __put_user(get_thread_wsaved(), &gw->count); /* 3. Save each valid window * Currently, it makes a copy of the windows from the kernel copy. * David's code for SunOS, makes the copy but keeps the pointer to * the kernel. My version makes the pointer point to a userland * copy of those. Mhm, I wonder if I shouldn't just ignore those * on setcontext and use those that are on the kernel, the signal * handler should not be modyfing those, mhm. * * These windows are just used in case synchronize_user_stack failed * to flush the user windows. */ #if 0 for (window = 0; window < get_thread_wsaved(); window++) { err |= __put_user((int *) &(gw->win[window]), (int **) gw->winptr + window); err |= copy_to_user(&gw->win[window], ¤t_thread_info()->reg_window[window], sizeof (svr4_rwindow_t)); err |= __put_user(0, (int *) gw->winptr + window); } #endif /* 4. 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; } #ifdef DEBUG_SIGNALS printk ("Solaris-frame: %x %x\n", (int) regs->tpc, (int) regs->tnpc); #endif /* Arguments passed to signal handler */ if (regs->u_regs [14]){ struct reg_window32 *rw = (struct reg_window32 *) (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: do_exit(SIGSEGV); } asmlinkage int svr4_getcontext(svr4_ucontext_t *uc, struct pt_regs *regs) { svr4_gregset_t *gr; svr4_mcontext_t *mc; svr4_sigset_t setv; int i, err; synchronize_user_stack(); save_and_clear_fpu(); if (get_thread_wsaved()) { #ifdef DEBUG_SIGNALS printk ("Uh oh, w_saved is not zero (%d)\n", (int) get_thread_wsaved()); #endif 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]); #if 1 err |= __put_user(0, &uc->mcontext.greg [SVR4_PSR]); #else i = tstate_to_psr(regs->tstate) & ~PSR_EF; if (current_thread_info()->fpsaved[0] & FPRS_FEF) i |= PSR_EF; err |= __put_user(i, &uc->mcontext.greg [SVR4_PSR]); #endif 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 *c, struct pt_regs *regs) { svr4_gregset_t *gr; mm_segment_t old_fs; u32 pc, npc, psr; 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()) { #ifdef DEBUG_SIGNALS printk ("Uh oh, w_saved is: 0x%x\n", get_thread_wsaved()); #endif goto sigsegv; } if (((unsigned long) c) & 3){ printk ("Unaligned structure passed\n"); goto sigsegv; } if (!__access_ok((unsigned long)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) { #ifdef DEBUG_SIGNALS printk ("setcontext, PC or nPC were bogus\n"); #endif 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((long)st.ss_sp, &c->stack.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(&st, NULL, regs->u_regs[UREG_I6]); set_fs(old_fs); sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sigmask_lock); current->blocked = set; recalc_sigpending(); spin_unlock_irq(¤t->sigmask_lock); 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); #if 0 if (psr & PSR_EF) regs->tstate |= TSTATE_PEF; #endif /* 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: do_exit(SIGSEGV); } static inline 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 *sf; int sigframe_size; u32 psr; int i, err; sigset_t32 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 *)get_sigframe(&ka->sa, regs, sigframe_size); if (invalid_frame_pointer (sf, sigframe_size)) { #ifdef DEBUG_SIGNALS printk("rt_setup_frame32(%s:%d): invalid_frame_pointer(%p, %d)\n", current->comm, current->pid, sf, sigframe_size); #endif goto sigill; } if (get_thread_wsaved() != 0) { #ifdef DEBUG_SIGNALS printk ("%s[%d]: Invalid user stack frame for " "signal delivery.\n", current->comm, current->pid); #endif 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]); 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(sigset_t32)); err |= copy_in_user((u32 *)sf, (u32 *)(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; /* 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); pmd_t *pmdp = pmd_offset(pgdp, 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)); __asm__ __volatile__( " membar #StoreStore\n" " flush %0 + %1" : : "r" (page), "r" (address & (PAGE_SIZE - 1)) : "memory"); } pte_unmap(ptep); preempt_enable(); } return; sigill: do_exit(SIGILL); sigsegv: do_exit(SIGSEGV); } 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); } if (ka->sa.sa_flags & SA_ONESHOT) ka->sa.sa_handler = SIG_DFL; if (!(ka->sa.sa_flags & SA_NOMASK)) { spin_lock_irq(¤t->sigmask_lock); sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); sigaddset(¤t->blocked,signr); recalc_sigpending(); spin_unlock_irq(¤t->sigmask_lock); } } static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs, struct sigaction *sa) { switch (regs->u_regs[UREG_I0]) { 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; } } #ifdef DEBUG_SIGNALS_MAPS #define MAPS_LINE_FORMAT "%016lx-%016lx %s %016lx %02x:%02x %lu " static inline void read_maps (void) { struct vm_area_struct * map, * next; char * buffer; ssize_t i; buffer = (char*)__get_free_page(GFP_KERNEL); if (!buffer) return; for (map = current->mm->mmap ; map ; map = next ) { /* produce the next line */ char *line; char str[5], *cp = str; int flags; dev_t dev; unsigned long ino; /* * Get the next vma now (but it won't be used if we sleep). */ next = map->vm_next; flags = map->vm_flags; *cp++ = flags & VM_READ ? 'r' : '-'; *cp++ = flags & VM_WRITE ? 'w' : '-'; *cp++ = flags & VM_EXEC ? 'x' : '-'; *cp++ = flags & VM_MAYSHARE ? 's' : 'p'; *cp++ = 0; dev = 0; ino = 0; if (map->vm_file != NULL) { dev = map->vm_file->f_dentry->d_inode->i_dev; ino = map->vm_file->f_dentry->d_inode->i_ino; line = d_path(map->vm_file->f_dentry, map->vm_file->f_vfsmnt, buffer, PAGE_SIZE); } printk(MAPS_LINE_FORMAT, map->vm_start, map->vm_end, str, map->vm_pgoff << PAGE_SHIFT, MAJOR(dev), MINOR(dev), ino); if (map->vm_file != NULL) printk("%s\n", line); else printk("\n"); } free_page((unsigned long)buffer); return; } #endif /* 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. */ int do_signal32(sigset_t *oldset, struct pt_regs * regs, unsigned long orig_i0, int restart_syscall) { unsigned long signr; struct k_sigaction *ka; siginfo_t info; int svr4_signal = current->personality == PER_SVR4; for (;;) { spin_lock_irq(¤t->sigmask_lock); signr = dequeue_signal(¤t->blocked, &info); spin_unlock_irq(¤t->sigmask_lock); if (!signr) break; if ((current->ptrace & PT_PTRACED) && signr != SIGKILL) { /* Do the syscall restart before we let the debugger * look at the child registers. */ if (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] = orig_i0; regs->tpc -= 4; regs->tnpc -= 4; restart_syscall = 0; } current->exit_code = signr; current->state = TASK_STOPPED; notify_parent(current, SIGCHLD); schedule(); if (!(signr = current->exit_code)) continue; current->exit_code = 0; if (signr == SIGSTOP) continue; /* Update the siginfo structure. Is this good? */ if (signr != info.si_signo) { info.si_signo = signr; info.si_errno = 0; info.si_code = SI_USER; info.si_pid = current->parent->pid; info.si_uid = current->parent->uid; } /* If the (new) signal is now blocked, requeue it. */ if (sigismember(¤t->blocked, signr)) { send_sig_info(signr, &info, current); continue; } } ka = ¤t->sig->action[signr-1]; if (ka->sa.sa_handler == SIG_IGN) { if (signr != SIGCHLD) continue; /* sys_wait4() grabs the master kernel lock, so * we need not do so, that sucker should be * threaded and would not be that difficult to * do anyways. */ while (sys_wait4(-1, NULL, WNOHANG, NULL) > 0) ; continue; } if (ka->sa.sa_handler == SIG_DFL) { unsigned long exit_code = signr; if (current->pid == 1) continue; switch (signr) { case SIGCONT: case SIGCHLD: case SIGWINCH: continue; case SIGTSTP: case SIGTTIN: case SIGTTOU: if (is_orphaned_pgrp(current->pgrp)) continue; case SIGSTOP: { struct signal_struct *sig; current->state = TASK_STOPPED; current->exit_code = signr; sig = current->parent->sig; if (sig && !(sig->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDSTOP)) notify_parent(current, SIGCHLD); schedule(); continue; } case SIGQUIT: case SIGILL: case SIGTRAP: case SIGABRT: case SIGFPE: case SIGSEGV: case SIGBUS: case SIGSYS: case SIGXCPU: case SIGXFSZ: if (do_coredump(signr, regs)) exit_code |= 0x80; #ifdef DEBUG_SIGNALS /* Very useful to debug dynamic linker problems */ printk ("Sig %ld going for %s[%d]...\n", signr, current->comm, current->pid); /* On SMP we are only interested in the current * CPU's registers. */ __show_regs (regs); #ifdef DEBUG_SIGNALS_TLB do { extern void sparc_ultra_dump_itlb(void); extern void sparc_ultra_dump_dtlb(void); sparc_ultra_dump_dtlb(); sparc_ultra_dump_itlb(); } while (0); #endif #ifdef DEBUG_SIGNALS_TRACE { struct reg_window32 *rw = (struct reg_window32 *)(regs->u_regs[UREG_FP] & 0xffffffff); unsigned int ins[8]; while (rw && !(((unsigned long) rw) & 0x3)) { copy_from_user(ins, &rw->ins[0], sizeof(ins)); printk("Caller[%08x](%08x,%08x,%08x,%08x,%08x,%08x)\n", ins[7], ins[0], ins[1], ins[2], ins[3], ins[4], ins[5]); rw = (struct reg_window32 *)(unsigned long)ins[6]; } } #endif #ifdef DEBUG_SIGNALS_MAPS printk("Maps:\n"); read_maps(); #endif #endif /* fall through */ default: sig_exit(signr, exit_code, &info); /* NOT REACHED */ } } if (restart_syscall) syscall_restart32(orig_i0, regs, &ka->sa); handle_signal32(signr, ka, &info, oldset, regs, svr4_signal); return 1; } if (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] = orig_i0; regs->tpc -= 4; regs->tnpc -= 4; } return 0; } struct sigstack32 { u32 the_stack; int cur_status; }; asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp) { struct sigstack32 *ssptr = (struct sigstack32 *)((unsigned long)(u_ssptr)); struct sigstack32 *ossptr = (struct sigstack32 *)((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) { void *ss_sp; if (get_user((long)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 int do_sys32_sigaltstack(u32 ussa, u32 uossa, unsigned long sp) { stack_t uss, uoss; int ret; mm_segment_t old_fs; if (ussa && (get_user((long)uss.ss_sp, &((stack_t32 *)(long)ussa)->ss_sp) || __get_user(uss.ss_flags, &((stack_t32 *)(long)ussa)->ss_flags) || __get_user(uss.ss_size, &((stack_t32 *)(long)ussa)->ss_size))) return -EFAULT; old_fs = get_fs(); set_fs(KERNEL_DS); ret = do_sigaltstack(ussa ? &uss : NULL, uossa ? &uoss : NULL, sp); set_fs(old_fs); if (!ret && uossa && (put_user((long)uoss.ss_sp, &((stack_t32 *)(long)uossa)->ss_sp) || __put_user(uoss.ss_flags, &((stack_t32 *)(long)uossa)->ss_flags) || __put_user(uoss.ss_size, &((stack_t32 *)(long)uossa)->ss_size))) return -EFAULT; return ret; }