/* $Id: signal.c,v 1.82 1998/07/31 05:18:51 jj Exp $ * linux/arch/sparc/kernel/signal.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) */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) asmlinkage int sys_wait4(pid_t pid, unsigned long *stat_addr, int options, unsigned long *ru); extern void fpsave(unsigned long *fpregs, unsigned long *fsr, void *fpqueue, unsigned long *fpqdepth); extern void fpload(unsigned long *fpregs, unsigned long *fsr); asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs, unsigned long orig_o0, int ret_from_syscall); /* This turned off for production... */ /* #define DEBUG_SIGNALS 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_sframe { struct reg_window sig_window; int sig_num; int sig_code; struct sigcontext *sig_scptr; int sig_address; struct sigcontext sig_context; unsigned int extramask[_NSIG_WORDS - 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_frame { struct sparc_stackf ss; __siginfo_t info; __siginfo_fpu_t *fpu_save; unsigned long insns [2] __attribute__ ((aligned (8))); unsigned int extramask[_NSIG_WORDS - 1]; __siginfo_fpu_t fpu_state; }; struct rt_signal_frame { struct sparc_stackf ss; siginfo_t info; struct pt_regs regs; sigset_t mask; __siginfo_fpu_t *fpu_save; unsigned int insns [2]; stack_t stack; __siginfo_fpu_t fpu_state; }; /* Align macros */ #define SF_ALIGNEDSZ (((sizeof(struct signal_sframe) + 7) & (~7))) #define NF_ALIGNEDSZ (((sizeof(struct new_signal_frame) + 7) & (~7))) #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7))) /* * atomically swap in the new signal mask, and wait for a signal. * This is really tricky on the Sparc, watch out... */ asmlinkage void _sigpause_common(old_sigset_t 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(current); spin_unlock_irq(¤t->sigmask_lock); regs->pc = regs->npc; regs->npc += 4; /* 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->psr |= PSR_C; regs->u_regs[UREG_I0] = EINTR; if (do_signal(&saveset, regs, 0, 0)) return; } } asmlinkage void do_sigpause(unsigned int set, struct pt_regs *regs) { _sigpause_common(set, regs); } asmlinkage void do_sigsuspend (struct pt_regs *regs) { _sigpause_common(regs->u_regs[UREG_I0], regs); } asmlinkage void do_rt_sigsuspend(sigset_t *uset, size_t sigsetsize, struct pt_regs *regs) { sigset_t oldset, set; /* XXX: Don't preclude handling different sized sigset_t's. */ if (sigsetsize != sizeof(sigset_t)) { regs->psr |= PSR_C; regs->u_regs[UREG_I0] = EINVAL; return; } if (copy_from_user(&set, uset, sizeof(set))) { regs->psr |= PSR_C; regs->u_regs[UREG_I0] = EFAULT; return; } sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sigmask_lock); oldset = current->blocked; current->blocked = set; recalc_sigpending(current); spin_unlock_irq(¤t->sigmask_lock); regs->pc = regs->npc; regs->npc += 4; /* 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->psr |= PSR_C; regs->u_regs[UREG_I0] = EINTR; if (do_signal(&oldset, regs, 0, 0)) return; } } static inline int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t *fpu) { int err; #ifdef __SMP__ if (current->flags & PF_USEDFPU) regs->psr &= ~PSR_EF; #else if (current == last_task_used_math) { last_task_used_math = 0; regs->psr &= ~PSR_EF; } #endif current->used_math = 1; current->flags &= ~PF_USEDFPU; err = copy_from_user(¤t->tss.float_regs[0], &fpu->si_float_regs[0], (sizeof(unsigned long) * 32)); err |= __get_user(current->tss.fsr, &fpu->si_fsr); err |= __get_user(current->tss.fpqdepth, &fpu->si_fpqdepth); if (current->tss.fpqdepth != 0) err |= copy_from_user(¤t->tss.fpqueue[0], &fpu->si_fpqueue[0], ((sizeof(unsigned long) + (sizeof(unsigned long *)))*16)); return err; } static inline void do_new_sigreturn (struct pt_regs *regs) { struct new_signal_frame *sf; unsigned long up_psr, pc, npc; sigset_t set; __siginfo_fpu_t *fpu_save; int err; sf = (struct new_signal_frame *) regs->u_regs [UREG_FP]; /* 1. Make sure we are not getting garbage from the user */ if (verify_area (VERIFY_READ, sf, sizeof (*sf))) goto segv_and_exit; if (((uint) sf) & 3) goto segv_and_exit; err = __get_user(pc, &sf->info.si_regs.pc); err |= __get_user(npc, &sf->info.si_regs.npc); if ((pc | npc) & 3) goto segv_and_exit; /* 2. Restore the state */ up_psr = regs->psr; err |= copy_from_user(regs, &sf->info.si_regs, sizeof (struct pt_regs)); /* User can only change condition codes and FPU enabling in %psr. */ regs->psr = (up_psr & ~(PSR_ICC | PSR_EF)) | (regs->psr & (PSR_ICC | PSR_EF)); err |= __get_user(fpu_save, &sf->fpu_save); if (fpu_save) err |= restore_fpu_state(regs, sf->fpu_save); /* This is pretty much atomic, no amount locking would prevent * the races which exist anyways. */ err |= __get_user(set.sig[0], &sf->info.si_mask); err |= copy_from_user(&set.sig[1], &sf->extramask, (_NSIG_WORDS-1) * sizeof(unsigned int)); if (err) goto segv_and_exit; sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sigmask_lock); current->blocked = set; recalc_sigpending(current); spin_unlock_irq(¤t->sigmask_lock); return; segv_and_exit: /* Ugh, we need to grab master lock in these rare cases ;-( */ lock_kernel(); do_exit(SIGSEGV); } asmlinkage void do_sigreturn(struct pt_regs *regs) { struct sigcontext *scptr; unsigned long pc, npc, psr; sigset_t set; int err; synchronize_user_stack(); if (current->tss.new_signal) return do_new_sigreturn (regs); scptr = (struct sigcontext *) regs->u_regs[UREG_I0]; /* Check sanity of the user arg. */ if(verify_area(VERIFY_READ, scptr, sizeof(struct sigcontext)) || (((unsigned long) scptr) & 3)) goto segv_and_exit; err = __get_user(pc, &scptr->sigc_pc); err |= __get_user(npc, &scptr->sigc_npc); if((pc | npc) & 3) goto segv_and_exit; /* This is pretty much atomic, no amount locking would prevent * the races which exist anyways. */ err |= __get_user(set.sig[0], &scptr->sigc_mask); /* Note that scptr + 1 points to extramask */ err |= copy_from_user(&set.sig[1], scptr + 1, (_NSIG_WORDS - 1) * sizeof(unsigned int)); if (err) goto segv_and_exit; sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sigmask_lock); current->blocked = set; recalc_sigpending(current); spin_unlock_irq(¤t->sigmask_lock); regs->pc = pc; regs->npc = 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 %psr. */ err |= __get_user(psr, &scptr->sigc_psr); if (err) goto segv_and_exit; regs->psr &= ~(PSR_ICC); regs->psr |= (psr & PSR_ICC); return; segv_and_exit: send_sig(SIGSEGV, current, 1); } asmlinkage void do_rt_sigreturn(struct pt_regs *regs) { struct rt_signal_frame *sf; unsigned int psr, pc, npc; __siginfo_fpu_t *fpu_save; sigset_t set; stack_t st; int err; synchronize_user_stack(); sf = (struct rt_signal_frame *) regs->u_regs[UREG_FP]; if(verify_area(VERIFY_READ, sf, sizeof(*sf)) || (((unsigned long) sf) & 0x03)) goto segv; err = get_user(pc, &sf->regs.pc); err |= __get_user(npc, &sf->regs.npc); err |= ((pc | npc) & 0x03); err |= __get_user(regs->y, &sf->regs.y); err |= __get_user(psr, &sf->regs.psr); err |= __copy_from_user(®s->u_regs[UREG_G1], &sf->regs.u_regs[UREG_G1], 15*sizeof(u32)); regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC); err |= __get_user(fpu_save, &sf->fpu_save); if(fpu_save) err |= restore_fpu_state(regs, &sf->fpu_state); err |= copy_from_user(&set, &sf->mask, sizeof(sigset_t)); err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t)); if (err) goto segv; regs->pc = pc; regs->npc = npc; /* It is more difficult to avoid calling this function than to call it and ignore errors. */ do_sigaltstack(&st, NULL, (unsigned long)sf); sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sigmask_lock); current->blocked = set; recalc_sigpending(current); spin_unlock_irq(¤t->sigmask_lock); return; segv: send_sig(SIGSEGV, current, 1); } /* Checks if the fp is valid */ static inline int invalid_frame_pointer (void *fp, int fplen) { if ((((unsigned long) fp) & 7) || !__access_ok((unsigned long)fp, fplen) || ((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) && ((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000))) return 1; return 0; } static inline void *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize) { unsigned long sp; 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 inline void setup_frame(struct sigaction *sa, unsigned long pc, unsigned long npc, struct pt_regs *regs, int signr, sigset_t *oldset) { struct signal_sframe *sframep; struct sigcontext *sc; int window = 0; synchronize_user_stack(); sframep = (struct signal_sframe *)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<%08lx> for sig<%d>\n", sframep, pc, signr); #endif /* Don't change signal code and address, so that * post mortem debuggers can have a look. */ goto sigill_and_return; } sc = &sframep->sig_context; /* We've already made sure frame pointer isn't in kernel space... */ __put_user((sas_ss_flags(regs->u_regs[UREG_FP]) == SS_ONSTACK), &sc->sigc_onstack); __put_user(oldset->sig[0], &sc->sigc_mask); __copy_to_user(sframep->extramask, &oldset->sig[1], (_NSIG_WORDS - 1) * sizeof(unsigned int)); __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp); __put_user(pc, &sc->sigc_pc); __put_user(npc, &sc->sigc_npc); __put_user(regs->psr, &sc->sigc_psr); __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1); __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0); __put_user(current->tss.w_saved, &sc->sigc_oswins); if(current->tss.w_saved) for(window = 0; window < current->tss.w_saved; window++) { sc->sigc_spbuf[window] = (char *)current->tss.rwbuf_stkptrs[window]; copy_to_user(&sc->sigc_wbuf[window], ¤t->tss.reg_window[window], sizeof(struct reg_window)); } else copy_to_user(sframep, (char *)regs->u_regs[UREG_FP], sizeof(struct reg_window)); current->tss.w_saved = 0; /* So process is allowed to execute. */ __put_user(signr, &sframep->sig_num); if(signr == SIGSEGV || signr == SIGILL || signr == SIGFPE || signr == SIGBUS || signr == SIGEMT) { __put_user(current->tss.sig_desc, &sframep->sig_code); __put_user(current->tss.sig_address, &sframep->sig_address); } else { __put_user(0, &sframep->sig_code); __put_user(0, &sframep->sig_address); } __put_user(sc, &sframep->sig_scptr); regs->u_regs[UREG_FP] = (unsigned long) sframep; regs->pc = (unsigned long) sa->sa_handler; regs->npc = (regs->pc + 4); return; sigill_and_return: /* Ugh, we need to grab master lock in these rare cases ;-( */ lock_kernel(); do_exit(SIGILL); } static inline void save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t *fpu) { #ifdef __SMP__ if (current->flags & PF_USEDFPU) { put_psr(get_psr() | PSR_EF); fpsave(¤t->tss.float_regs[0], ¤t->tss.fsr, ¤t->tss.fpqueue[0], ¤t->tss.fpqdepth); regs->psr &= ~(PSR_EF); current->flags &= ~(PF_USEDFPU); } #else if (current == last_task_used_math) { put_psr(get_psr() | PSR_EF); fpsave(¤t->tss.float_regs[0], ¤t->tss.fsr, ¤t->tss.fpqueue[0], ¤t->tss.fpqdepth); last_task_used_math = 0; regs->psr &= ~(PSR_EF); } #endif copy_to_user(&fpu->si_float_regs[0], ¤t->tss.float_regs[0], (sizeof(unsigned long) * 32)); __put_user(current->tss.fsr, &fpu->si_fsr); __put_user(current->tss.fpqdepth, &fpu->si_fpqdepth); if (current->tss.fpqdepth != 0) copy_to_user(&fpu->si_fpqueue[0], ¤t->tss.fpqueue[0], ((sizeof(unsigned long) + (sizeof(unsigned long *)))*16)); current->used_math = 0; } static inline void new_setup_frame(struct k_sigaction *ka, struct pt_regs *regs, int signo, sigset_t *oldset) { struct new_signal_frame *sf; int sigframe_size; /* 1. Make sure everything is clean */ synchronize_user_stack(); sigframe_size = NF_ALIGNEDSZ; if (!current->used_math) sigframe_size -= sizeof(__siginfo_fpu_t); sf = (struct new_signal_frame *)get_sigframe(&ka->sa, regs, sigframe_size); if (invalid_frame_pointer (sf, sigframe_size)) goto sigill_and_return; if (current->tss.w_saved != 0) { #ifdef DEBUG_SIGNALS printk ("%s [%d]: Invalid user stack frame for " "signal delivery.\n", current->comm, current->pid); #endif goto sigill_and_return; } /* 2. Save the current process state */ copy_to_user(&sf->info.si_regs, regs, sizeof (struct pt_regs)); if (current->used_math) { save_fpu_state(regs, &sf->fpu_state); __put_user(&sf->fpu_state, &sf->fpu_save); } else { __put_user(0, &sf->fpu_save); } __put_user(oldset->sig[0], &sf->info.si_mask); __copy_to_user(sf->extramask, &oldset->sig[1], (_NSIG_WORDS - 1) * sizeof(unsigned int)); copy_to_user(sf, (char *) regs->u_regs [UREG_FP], sizeof (struct reg_window)); /* 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->pc = (unsigned long) ka->sa.sa_handler; regs->npc = (regs->pc + 4); /* 5. return to kernel instructions */ if (ka->ka_restorer) regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; else { regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2); __put_user(0x821020d8, &sf->insns[0]); /* mov __NR_sigreturn, %g1 */ __put_user(0x91d02010, &sf->insns[1]); /* t 0x10 */ /* Flush instruction space. */ flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); } return; sigill_and_return: lock_kernel(); do_exit(SIGILL); } static inline void new_setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs, int signo, sigset_t *oldset, siginfo_t *info) { struct rt_signal_frame *sf; int sigframe_size; unsigned int psr; int i; synchronize_user_stack(); sigframe_size = RT_ALIGNEDSZ; if(!current->used_math) sigframe_size -= sizeof(__siginfo_fpu_t); sf = (struct rt_signal_frame *)get_sigframe(&ka->sa, regs, sigframe_size); if(invalid_frame_pointer(sf, sigframe_size)) goto sigill; if(current->tss.w_saved != 0) goto sigill; put_user(regs->pc, &sf->regs.pc); __put_user(regs->npc, &sf->regs.npc); __put_user(regs->y, &sf->regs.y); psr = regs->psr; if(current->used_math) psr |= PSR_EF; __put_user(psr, &sf->regs.psr); for(i = 0; i < 16; i++) __put_user(regs->u_regs[i], &sf->regs.u_regs[i]); if(psr & PSR_EF) { save_fpu_state(regs, &sf->fpu_state); __put_user(&sf->fpu_state, &sf->fpu_save); } else { __put_user(0, &sf->fpu_save); } __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t)); /* Setup sigaltstack */ __put_user(current->sas_ss_sp, &sf->stack.ss_sp); __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); __put_user(current->sas_ss_size, &sf->stack.ss_size); copy_to_user(sf, (char *) regs->u_regs [UREG_FP], sizeof (struct reg_window)); regs->u_regs[UREG_FP] = (unsigned long) sf; regs->u_regs[UREG_I0] = signo; regs->u_regs[UREG_I1] = (unsigned long) &sf->info; regs->pc = (unsigned long) ka->sa.sa_handler; regs->npc = (regs->pc + 4); if(ka->ka_restorer) regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; else { regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2); __put_user(0x821020d8, &sf->insns[0]); /* mov __NR_sigreturn, %g1 */ __put_user(0x91d02010, &sf->insns[1]); /* t 0x10 */ /* Flush instruction space. */ flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); } return; sigill: lock_kernel(); do_exit(SIGILL); } /* Setup a Solaris stack frame */ static inline void setup_svr4_frame(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; int window = 0; synchronize_user_stack(); sfp = (svr4_signal_frame_t *) get_sigframe(sa, regs, SVR4_SF_ALIGNED + REGWIN_SZ); if (invalid_frame_pointer (sfp, sizeof (*sfp))){ #ifdef DEBUG_SIGNALS printk ("Invalid stack frame\n"); #endif goto sigill_and_return; } /* Start with a clean frame pointer and fill it */ 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[1]; if (_NSIG_WORDS >= 4) { setv.sigbits[2] = oldset->sig[2]; setv.sigbits[3] = oldset->sig[3]; __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t)); } else __copy_to_user(&uc->sigmask, &setv, 2 * sizeof(unsigned int)); /* Store registers */ __put_user(regs->pc, &((*gr) [SVR4_PC])); __put_user(regs->npc, &((*gr) [SVR4_NPC])); __put_user(regs->psr, &((*gr) [SVR4_PSR])); __put_user(regs->y, &((*gr) [SVR4_Y])); /* Copy g [1..7] and o [0..7] registers */ copy_to_user(&(*gr)[SVR4_G1], ®s->u_regs [UREG_G1], sizeof (long) * 7); copy_to_user(&(*gr)[SVR4_O0], ®s->u_regs [UREG_I0], sizeof (long) * 8); /* Setup sigaltstack */ __put_user(current->sas_ss_sp, &uc->stack.sp); __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags); __put_user(current->sas_ss_size, &uc->stack.size); /* Save the currently window file: */ /* 1. Link sfp->uc->gwins to our windows */ __put_user(gw, &mc->gwin); /* 2. Number of windows to restore at setcontext (): */ __put_user(current->tss.w_saved, &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. */ for(window = 0; window < current->tss.w_saved; window++) { __put_user((int *) &(gw->win [window]), &gw->winptr [window]); copy_to_user(&gw->win [window], ¤t->tss.reg_window [window], sizeof (svr4_rwindow_t)); __put_user(0, gw->winptr [window]); } /* 4. We just pay attention to the gw->count field on setcontext */ current->tss.w_saved = 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 those that David already * is providing with tss.sig_desc */ __put_user(signr, &si->siginfo.signo); __put_user(SVR4_SINOINFO, &si->siginfo.code); regs->u_regs[UREG_FP] = (unsigned long) sfp; regs->pc = (unsigned long) sa->sa_handler; regs->npc = (regs->pc + 4); #ifdef DEBUG_SIGNALS printk ("Solaris-frame: %x %x\n", (int) regs->pc, (int) regs->npc); #endif /* Arguments passed to signal handler */ if (regs->u_regs [14]){ struct reg_window *rw = (struct reg_window *) regs->u_regs [14]; __put_user(signr, &rw->ins [0]); __put_user(si, &rw->ins [1]); __put_user(uc, &rw->ins [2]); __put_user(sfp, &rw->ins [6]); /* frame pointer */ regs->u_regs[UREG_I0] = signr; regs->u_regs[UREG_I1] = (uint) si; regs->u_regs[UREG_I2] = (uint) uc; } return; sigill_and_return: lock_kernel(); do_exit(SIGILL); } asmlinkage int svr4_getcontext (svr4_ucontext_t *uc, struct pt_regs *regs) { svr4_gregset_t *gr; svr4_mcontext_t *mc; svr4_sigset_t setv; synchronize_user_stack(); if (current->tss.w_saved) goto sigsegv_and_return; if(clear_user(uc, sizeof (*uc))) return -EFAULT; /* Setup convenience variables */ mc = &uc->mcontext; gr = &mc->greg; setv.sigbits[0] = current->blocked.sig[0]; setv.sigbits[1] = current->blocked.sig[1]; if (_NSIG_WORDS >= 4) { setv.sigbits[2] = current->blocked.sig[2]; setv.sigbits[3] = current->blocked.sig[3]; __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t)); } else __copy_to_user(&uc->sigmask, &setv, 2 * sizeof(unsigned int)); /* Store registers */ __put_user(regs->pc, &uc->mcontext.greg [SVR4_PC]); __put_user(regs->npc, &uc->mcontext.greg [SVR4_NPC]); __put_user(regs->psr, &uc->mcontext.greg [SVR4_PSR]); __put_user(regs->y, &uc->mcontext.greg [SVR4_Y]); /* Copy g [1..7] and o [0..7] registers */ copy_to_user(&(*gr)[SVR4_G1], ®s->u_regs [UREG_G1], sizeof (uint) * 7); copy_to_user(&(*gr)[SVR4_O0], ®s->u_regs [UREG_I0], sizeof (uint) * 8); /* Setup sigaltstack */ __put_user(current->sas_ss_sp, &uc->stack.sp); __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags); __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 0; sigsegv_and_return: lock_kernel(); do_exit(SIGSEGV); } /* 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) { struct thread_struct *tp = ¤t->tss; svr4_gregset_t *gr; unsigned long pc, npc, psr; sigset_t set; svr4_sigset_t setv; int 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 (tp->w_saved) goto sigsegv_and_return; if (((uint) c) & 3) goto sigsegv_and_return; if(!__access_ok((unsigned long)c, sizeof(*c))) goto sigsegv_and_return; /* 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_and_return; /* 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 */ /* This is pretty much atomic, no amount locking would prevent * the races which exist anyways. */ err |= __copy_from_user(&setv, &c->sigmask, sizeof(svr4_sigset_t)); err |= __get_user(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_and_return; /* It is more difficult to avoid calling this function than to call it and ignore errors. */ do_sigaltstack(&st, NULL, regs->u_regs[UREG_I6]); set.sig[0] = setv.sigbits[0]; set.sig[1] = setv.sigbits[1]; if (_NSIG_WORDS >= 4) { set.sig[2] = setv.sigbits[2]; set.sig[3] = setv.sigbits[3]; } sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sigmask_lock); current->blocked = set; recalc_sigpending(current); spin_unlock_irq(¤t->sigmask_lock); regs->pc = pc; regs->npc = npc | 1; __get_user(regs->y, &((*gr) [SVR4_Y])); __get_user(psr, &((*gr) [SVR4_PSR])); regs->psr &= ~(PSR_ICC); regs->psr |= (psr & PSR_ICC); /* Restore g[1..7] and o[0..7] registers */ copy_from_user(®s->u_regs [UREG_G1], &(*gr)[SVR4_G1], sizeof (long) * 7); copy_from_user(®s->u_regs [UREG_I0], &(*gr)[SVR4_O0], sizeof (long) * 8); return 0; sigsegv_and_return: lock_kernel(); do_exit(SIGSEGV); } static inline void handle_signal(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_frame(&ka->sa, regs->pc, regs->npc, regs, signr, oldset); else { if (ka->sa.sa_flags & SA_SIGINFO) new_setup_rt_frame(ka, regs, signr, oldset, info); else if (current->tss.new_signal) new_setup_frame (ka, regs, signr, oldset); else setup_frame(&ka->sa, regs->pc, regs->npc, regs, signr, oldset); } 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(current); spin_unlock_irq(¤t->sigmask_lock); } } static inline void syscall_restart(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->psr |= PSR_C; 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->pc -= 4; regs->npc -= 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. */ asmlinkage int do_signal(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; if (!oldset) oldset = ¤t->blocked; for (;;) { spin_lock_irq(¤t->sigmask_lock); signr = dequeue_signal(¤t->blocked, &info); spin_unlock_irq(¤t->sigmask_lock); if (!signr) break; if ((current->flags & PF_PTRACED) && signr != SIGKILL) { current->exit_code = signr; current->state = TASK_STOPPED; /* This happens to be SMP safe so no need to * grab master kernel lock even in this case. */ 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->p_pptr->pid; info.si_uid = current->p_pptr->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: /* The operations performed by * is_orphaned_pgrp() are protected by * the tasklist_lock. */ if (is_orphaned_pgrp(current->pgrp)) continue; case SIGSTOP: if (current->flags & PF_PTRACED) continue; current->state = TASK_STOPPED; current->exit_code = signr; /* notify_parent() is SMP safe */ if(!(current->p_pptr->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: if(current->binfmt && current->binfmt->core_dump) { lock_kernel(); if(current->binfmt->core_dump(signr, regs)) exit_code |= 0x80; unlock_kernel(); } #ifdef DEBUG_SIGNALS /* Very useful to debug dynamic linker problems */ printk ("Sig ILL going...\n"); show_regs (regs); #endif /* fall through */ default: lock_kernel(); sigaddset(¤t->signal, signr); current->flags |= PF_SIGNALED; do_exit(exit_code); /* NOT REACHED */ } } if(restart_syscall) syscall_restart(orig_i0, regs, &ka->sa); handle_signal(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->pc -= 4; regs->npc -= 4; } return 0; } asmlinkage int do_sys_sigstack(struct sigstack *ssptr, struct sigstack *ossptr, unsigned long sp) { 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; }