diff options
Diffstat (limited to 'arch/sparc/kernel/signal.c')
| -rw-r--r-- | arch/sparc/kernel/signal.c | 1123 |
1 files changed, 0 insertions, 1123 deletions
diff --git a/arch/sparc/kernel/signal.c b/arch/sparc/kernel/signal.c deleted file mode 100644 index 9994cac9507..00000000000 --- a/arch/sparc/kernel/signal.c +++ /dev/null @@ -1,1123 +0,0 @@ -/* $Id: signal.c,v 1.110 2002/02/08 03:57:14 davem 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 <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.h> -#include <linux/binfmts.h> /* do_coredum */ -#include <linux/bitops.h> - -#include <asm/uaccess.h> -#include <asm/ptrace.h> -#include <asm/svr4.h> -#include <asm/pgalloc.h> -#include <asm/pgtable.h> -#include <asm/cacheflush.h> /* flush_sig_insns */ - -#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) - -extern void fpsave(unsigned long *fpregs, unsigned long *fsr, - void *fpqueue, unsigned long *fpqdepth); -extern void fpload(unsigned long *fpregs, unsigned long *fsr); - -/* 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 __user *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 __user *fpu_save; - unsigned long insns[2] __attribute__ ((aligned (8))); - unsigned int extramask[_NSIG_WORDS - 1]; - unsigned int extra_size; /* Should be 0 */ - __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 __user *fpu_save; - unsigned int insns[2]; - stack_t stack; - unsigned int extra_size; /* Should be 0 */ - __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))) - -static int _sigpause_common(old_sigset_t set) -{ - set &= _BLOCKABLE; - spin_lock_irq(¤t->sighand->siglock); - current->saved_sigmask = current->blocked; - siginitset(¤t->blocked, set); - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - - current->state = TASK_INTERRUPTIBLE; - schedule(); - set_thread_flag(TIF_RESTORE_SIGMASK); - - return -ERESTARTNOHAND; -} - -asmlinkage int sys_sigpause(unsigned int set) -{ - return _sigpause_common(set); -} - -asmlinkage int sys_sigsuspend(old_sigset_t set) -{ - return _sigpause_common(set); -} - -static inline int -restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) -{ - int err; -#ifdef CONFIG_SMP - if (test_tsk_thread_flag(current, TIF_USEDFPU)) - regs->psr &= ~PSR_EF; -#else - if (current == last_task_used_math) { - last_task_used_math = NULL; - regs->psr &= ~PSR_EF; - } -#endif - set_used_math(); - clear_tsk_thread_flag(current, TIF_USEDFPU); - - if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu))) - return -EFAULT; - - err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0], - (sizeof(unsigned long) * 32)); - err |= __get_user(current->thread.fsr, &fpu->si_fsr); - err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth); - if (current->thread.fpqdepth != 0) - err |= __copy_from_user(¤t->thread.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 __user *sf; - unsigned long up_psr, pc, npc; - sigset_t set; - __siginfo_fpu_t __user *fpu_save; - int err; - - sf = (struct new_signal_frame __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))) - goto segv_and_exit; - - if (((unsigned long) 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, 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->sighand->siglock); - current->blocked = set; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - return; - -segv_and_exit: - force_sig(SIGSEGV, current); -} - -asmlinkage void do_sigreturn(struct pt_regs *regs) -{ - struct sigcontext __user *scptr; - unsigned long pc, npc, psr; - sigset_t set; - 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 (current->thread.new_signal) { - do_new_sigreturn(regs); - return; - } - - scptr = (struct sigcontext __user *) regs->u_regs[UREG_I0]; - - /* Check sanity of the user arg. */ - if (!access_ok(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->sighand->siglock); - current->blocked = set; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - - 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: - force_sig(SIGSEGV, current); -} - -asmlinkage void do_rt_sigreturn(struct pt_regs *regs) -{ - struct rt_signal_frame __user *sf; - unsigned int psr, pc, npc; - __siginfo_fpu_t __user *fpu_save; - mm_segment_t old_fs; - sigset_t set; - stack_t st; - int err; - - synchronize_user_stack(); - sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP]; - if (!access_ok(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, fpu_save); - 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. - */ - old_fs = get_fs(); - set_fs(KERNEL_DS); - do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf); - set_fs(old_fs); - - 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 inline int invalid_frame_pointer(void __user *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 __user *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 __user *)(sp - framesize); -} - -static inline void -setup_frame(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info) -{ - struct signal_sframe __user *sframep; - struct sigcontext __user *sc; - int window = 0, err; - unsigned long pc = regs->pc; - unsigned long npc = regs->npc; - struct thread_info *tp = current_thread_info(); - void __user *sig_address; - int sig_code; - - synchronize_user_stack(); - sframep = (struct signal_sframe __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. - */ - goto sigill_and_return; - } - - 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); - err |= __put_user(oldset->sig[0], &sc->sigc_mask); - err |= __copy_to_user(sframep->extramask, &oldset->sig[1], - (_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); - err |= __put_user(regs->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(tp->w_saved, &sc->sigc_oswins); - if (tp->w_saved) - for (window = 0; window < tp->w_saved; window++) { - put_user((char *)tp->rwbuf_stkptrs[window], - &sc->sigc_spbuf[window]); - err |= __copy_to_user(&sc->sigc_wbuf[window], - &tp->reg_window[window], - sizeof(struct reg_window)); - } - else - err |= __copy_to_user(sframep, (char *) regs->u_regs[UREG_FP], - sizeof(struct reg_window)); - - tp->w_saved = 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_sunos.c */ - sig_code = info->si_trapno; - break; - } - default: - sig_address = NULL; - } - } - err |= __put_user((unsigned long)sig_address, &sframep->sig_address); - err |= __put_user(sig_code, &sframep->sig_code); - err |= __put_user(sc, &sframep->sig_scptr); - if (err) - goto sigsegv; - - regs->u_regs[UREG_FP] = (unsigned long) sframep; - regs->pc = (unsigned long) sa->sa_handler; - regs->npc = (regs->pc + 4); - return; - -sigill_and_return: - do_exit(SIGILL); -sigsegv: - force_sigsegv(signr, current); -} - - -static inline int -save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) -{ - int err = 0; -#ifdef CONFIG_SMP - if (test_tsk_thread_flag(current, TIF_USEDFPU)) { - put_psr(get_psr() | PSR_EF); - fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, - ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); - regs->psr &= ~(PSR_EF); - clear_tsk_thread_flag(current, TIF_USEDFPU); - } -#else - if (current == last_task_used_math) { - put_psr(get_psr() | PSR_EF); - fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, - ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); - last_task_used_math = NULL; - regs->psr &= ~(PSR_EF); - } -#endif - err |= __copy_to_user(&fpu->si_float_regs[0], - ¤t->thread.float_regs[0], - (sizeof(unsigned long) * 32)); - err |= __put_user(current->thread.fsr, &fpu->si_fsr); - err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth); - if (current->thread.fpqdepth != 0) - err |= __copy_to_user(&fpu->si_fpqueue[0], - ¤t->thread.fpqueue[0], - ((sizeof(unsigned long) + - (sizeof(unsigned long *)))*16)); - clear_used_math(); - return err; -} - -static inline void -new_setup_frame(struct k_sigaction *ka, struct pt_regs *regs, - int signo, sigset_t *oldset) -{ - struct new_signal_frame __user *sf; - int sigframe_size, err; - - /* 1. Make sure everything is clean */ - synchronize_user_stack(); - - sigframe_size = NF_ALIGNEDSZ; - if (!used_math()) - sigframe_size -= sizeof(__siginfo_fpu_t); - - sf = (struct new_signal_frame __user *) - get_sigframe(&ka->sa, regs, sigframe_size); - - if (invalid_frame_pointer(sf, sigframe_size)) - goto sigill_and_return; - - if (current_thread_info()->w_saved != 0) - goto sigill_and_return; - - /* 2. Save the current process state */ - err = __copy_to_user(&sf->info.si_regs, regs, sizeof(struct pt_regs)); - - err |= __put_user(0, &sf->extra_size); - - if (used_math()) { - err |= save_fpu_state(regs, &sf->fpu_state); - err |= __put_user(&sf->fpu_state, &sf->fpu_save); - } else { - err |= __put_user(0, &sf->fpu_save); - } - - err |= __put_user(oldset->sig[0], &sf->info.si_mask); - err |= __copy_to_user(sf->extramask, &oldset->sig[1], - (_NSIG_WORDS - 1) * sizeof(unsigned int)); - err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP], - sizeof(struct reg_window)); - 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->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); - - /* mov __NR_sigreturn, %g1 */ - err |= __put_user(0x821020d8, &sf->insns[0]); - - /* t 0x10 */ - err |= __put_user(0x91d02010, &sf->insns[1]); - if (err) - goto sigsegv; - - /* Flush instruction space. */ - flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); - } - return; - -sigill_and_return: - do_exit(SIGILL); -sigsegv: - force_sigsegv(signo, current); -} - -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 __user *sf; - int sigframe_size; - unsigned int psr; - int err; - - synchronize_user_stack(); - sigframe_size = RT_ALIGNEDSZ; - if (!used_math()) - sigframe_size -= sizeof(__siginfo_fpu_t); - sf = (struct rt_signal_frame __user *) - get_sigframe(&ka->sa, regs, sigframe_size); - if (invalid_frame_pointer(sf, sigframe_size)) - goto sigill; - if (current_thread_info()->w_saved != 0) - goto sigill; - - err = __put_user(regs->pc, &sf->regs.pc); - err |= __put_user(regs->npc, &sf->regs.npc); - err |= __put_user(regs->y, &sf->regs.y); - psr = regs->psr; - if (used_math()) - psr |= PSR_EF; - err |= __put_user(psr, &sf->regs.psr); - err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs)); - err |= __put_user(0, &sf->extra_size); - - if (psr & PSR_EF) { - err |= save_fpu_state(regs, &sf->fpu_state); - err |= __put_user(&sf->fpu_state, &sf->fpu_save); - } else { - err |= __put_user(0, &sf->fpu_save); - } - err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t)); - - /* 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); - - err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP], - sizeof(struct reg_window)); - - err |= copy_siginfo_to_user(&sf->info, info); - - if (err) - goto sigsegv; - - 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->regs; - - 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); - - /* mov __NR_sigreturn, %g1 */ - err |= __put_user(0x821020d8, &sf->insns[0]); - - /* t 0x10 */ - err |= __put_user(0x91d02010, &sf->insns[1]); - if (err) - goto sigsegv; - - /* Flush instruction space. */ - flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); - } - return; - -sigill: - do_exit(SIGILL); -sigsegv: - force_sigsegv(signo, current); -} - -/* 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 __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; - struct thread_info *tp = current_thread_info(); - int window = 0, err; - - synchronize_user_stack(); - sfp = (svr4_signal_frame_t __user *) - get_sigframe(sa, regs, SVR4_SF_ALIGNED + sizeof(struct reg_window)); - - if (invalid_frame_pointer(sfp, sizeof(*sfp))) - goto sigill_and_return; - - /* 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[1]; - if (_NSIG_WORDS >= 4) { - setv.sigbits[2] = oldset->sig[2]; - setv.sigbits[3] = oldset->sig[3]; - 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 */ - err |= __put_user(regs->pc, &((*gr)[SVR4_PC])); - err |= __put_user(regs->npc, &((*gr)[SVR4_NPC])); - err |= __put_user(regs->psr, &((*gr)[SVR4_PSR])); - err |= __put_user(regs->y, &((*gr)[SVR4_Y])); - - /* Copy g[1..7] and o[0..7] registers */ - err |= __copy_to_user(&(*gr)[SVR4_G1], ®s->u_regs[UREG_G1], - sizeof(long) * 7); - err |= __copy_to_user(&(*gr)[SVR4_O0], ®s->u_regs[UREG_I0], - sizeof(long) * 8); - - /* 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(gw, &mc->gwin); - - /* 2. Number of windows to restore at setcontext(): */ - err |= __put_user(tp->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 < tp->w_saved; window++) { - err |= __put_user((int __user *) &(gw->win[window]), &gw->winptr[window]); - err |= __copy_to_user(&gw->win[window], - &tp->reg_window[window], - sizeof(svr4_rwindow_t)); - err |= __put_user(0, gw->winptr[window]); - } - - /* 4. We just pay attention to the gw->count field on setcontext */ - tp->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 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->pc = (unsigned long) sa->sa_handler; - regs->npc = (regs->pc + 4); - - /* Arguments passed to signal handler */ - if (regs->u_regs[14]){ - struct reg_window __user *rw = (struct reg_window __user *) - regs->u_regs[14]; - - err |= __put_user(signr, &rw->ins[0]); - err |= __put_user(si, &rw->ins[1]); - err |= __put_user(uc, &rw->ins[2]); - err |= __put_user(sfp, &rw->ins[6]); /* frame pointer */ - if (err) - goto sigsegv; - - regs->u_regs[UREG_I0] = signr; - regs->u_regs[UREG_I1] = (unsigned long) si; - regs->u_regs[UREG_I2] = (unsigned long) uc; - } - return; - -sigill_and_return: - do_exit(SIGILL); -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 err = 0; - - synchronize_user_stack(); - - if (current_thread_info()->w_saved) - return -EFAULT; - - err = clear_user(uc, sizeof(*uc)); - if (err) - 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]; - 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 */ - err |= __put_user(regs->pc, &uc->mcontext.greg[SVR4_PC]); - err |= __put_user(regs->npc, &uc->mcontext.greg[SVR4_NPC]); - err |= __put_user(regs->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 */ - err |= __copy_to_user(&(*gr)[SVR4_G1], ®s->u_regs[UREG_G1], - sizeof(uint) * 7); - err |= __copy_to_user(&(*gr)[SVR4_O0], ®s->u_regs[UREG_I0], - sizeof(uint) * 8); - - /* 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; - unsigned long pc, npc, psr; - mm_segment_t old_fs; - 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 (current_thread_info()->w_saved) - goto sigsegv_and_return; - - if (((unsigned long) 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. */ - old_fs = get_fs(); - set_fs(KERNEL_DS); - do_sigaltstack((const stack_t __user *) &st, NULL, - regs->u_regs[UREG_I6]); - set_fs(old_fs); - - 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->sighand->siglock); - current->blocked = set; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - regs->pc = pc; - regs->npc = npc | 1; - err |= __get_user(regs->y, &((*gr)[SVR4_Y])); - err |= __get_user(psr, &((*gr)[SVR4_PSR])); - regs->psr &= ~(PSR_ICC); - regs->psr |= (psr & PSR_ICC); - - /* Restore g[1..7] and o[0..7] registers */ - err |= __copy_from_user(®s->u_regs[UREG_G1], &(*gr)[SVR4_G1], - sizeof(long) * 7); - err |= __copy_from_user(®s->u_regs[UREG_I0], &(*gr)[SVR4_O0], - sizeof(long) * 8); - return (err ? -EFAULT : 0); - -sigsegv_and_return: - force_sig(SIGSEGV, current); - return -EFAULT; -} - -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->thread.new_signal) - new_setup_frame(ka, regs, signr, oldset); - else - setup_frame(&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_restart(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->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 void do_signal(struct pt_regs * regs, unsigned long orig_i0, int restart_syscall) -{ - siginfo_t info; - struct sparc_deliver_cookie cookie; - struct k_sigaction ka; - int signr; - sigset_t *oldset; - - /* - * XXX Disable svr4 signal handling until solaris emulation works. - * It is buggy - Anton - */ -#define SVR4_SIGNAL_BROKEN 1 -#ifdef SVR4_SIGNAL_BROKEN - int svr4_signal = 0; -#else - int svr4_signal = current->personality == PER_SVR4; -#endif - - cookie.restart_syscall = restart_syscall; - cookie.orig_i0 = orig_i0; - - if (test_thread_flag(TIF_RESTORE_SIGMASK)) - oldset = ¤t->saved_sigmask; - else - oldset = ¤t->blocked; - - signr = get_signal_to_deliver(&info, &ka, regs, &cookie); - if (signr > 0) { - if (cookie.restart_syscall) - syscall_restart(cookie.orig_i0, regs, &ka.sa); - handle_signal(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->pc -= 4; - regs->npc -= 4; - } - if (cookie.restart_syscall && - regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { - regs->u_regs[UREG_G1] = __NR_restart_syscall; - regs->pc -= 4; - regs->npc -= 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); - } -} - -asmlinkage int -do_sys_sigstack(struct sigstack __user *ssptr, struct sigstack __user *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) { - char *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; -} - -void ptrace_signal_deliver(struct pt_regs *regs, void *cookie) -{ - struct sparc_deliver_cookie *cp = cookie; - - if (cp->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] = cp->orig_i0; - regs->pc -= 4; - regs->npc -= 4; - cp->restart_syscall = 0; - } - - if (cp->restart_syscall && - regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { - regs->u_regs[UREG_G1] = __NR_restart_syscall; - regs->pc -= 4; - regs->npc -= 4; - cp->restart_syscall = 0; - } -} |