diff options
Diffstat (limited to 'arch/sparc64/kernel/signal.c')
| -rw-r--r-- | arch/sparc64/kernel/signal.c | 688 |
1 files changed, 688 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/signal.c b/arch/sparc64/kernel/signal.c new file mode 100644 index 00000000000..b27934671c3 --- /dev/null +++ b/arch/sparc64/kernel/signal.c @@ -0,0 +1,688 @@ +/* $Id: signal.c,v 1.60 2002/02/09 19:49:31 davem Exp $ + * arch/sparc64/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) + * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + */ + +#include <linux/config.h> +#ifdef CONFIG_SPARC32_COMPAT +#include <linux/compat.h> /* for compat_old_sigset_t */ +#endif +#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 <linux/bitops.h> + +#include <asm/uaccess.h> +#include <asm/ptrace.h> +#include <asm/svr4.h> +#include <asm/pgtable.h> +#include <asm/fpumacro.h> +#include <asm/uctx.h> +#include <asm/siginfo.h> +#include <asm/visasm.h> + +#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) + +static int do_signal(sigset_t *oldset, struct pt_regs * regs, + unsigned long orig_o0, int ret_from_syscall); + +/* {set, get}context() needed for 64-bit SparcLinux userland. */ +asmlinkage void sparc64_set_context(struct pt_regs *regs) +{ + struct ucontext __user *ucp = (struct ucontext __user *) + regs->u_regs[UREG_I0]; + mc_gregset_t __user *grp; + unsigned long pc, npc, tstate; + unsigned long fp, i7; + unsigned char fenab; + int err; + + flush_user_windows(); + if (get_thread_wsaved() || + (((unsigned long)ucp) & (sizeof(unsigned long)-1)) || + (!__access_ok(ucp, sizeof(*ucp)))) + goto do_sigsegv; + grp = &ucp->uc_mcontext.mc_gregs; + err = __get_user(pc, &((*grp)[MC_PC])); + err |= __get_user(npc, &((*grp)[MC_NPC])); + if (err || ((pc | npc) & 3)) + goto do_sigsegv; + if (regs->u_regs[UREG_I1]) { + sigset_t set; + + if (_NSIG_WORDS == 1) { + if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0])) + goto do_sigsegv; + } else { + if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t))) + goto do_sigsegv; + } + sigdelsetmask(&set, ~_BLOCKABLE); + spin_lock_irq(¤t->sighand->siglock); + current->blocked = set; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + } + if (test_thread_flag(TIF_32BIT)) { + pc &= 0xffffffff; + npc &= 0xffffffff; + } + regs->tpc = pc; + regs->tnpc = npc; + err |= __get_user(regs->y, &((*grp)[MC_Y])); + err |= __get_user(tstate, &((*grp)[MC_TSTATE])); + regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); + regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); + err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1])); + err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2])); + err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3])); + err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4])); + err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5])); + err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6])); + err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7])); + err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0])); + err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1])); + err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2])); + err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3])); + err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4])); + err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5])); + err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6])); + err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7])); + + err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp)); + err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7)); + err |= __put_user(fp, + (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); + err |= __put_user(i7, + (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); + + err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab)); + if (fenab) { + unsigned long *fpregs = current_thread_info()->fpregs; + unsigned long fprs; + + fprs_write(0); + err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs)); + if (fprs & FPRS_DL) + err |= copy_from_user(fpregs, + &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs), + (sizeof(unsigned int) * 32)); + if (fprs & FPRS_DU) + err |= copy_from_user(fpregs+16, + ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16, + (sizeof(unsigned int) * 32)); + err |= __get_user(current_thread_info()->xfsr[0], + &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr)); + err |= __get_user(current_thread_info()->gsr[0], + &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr)); + regs->tstate &= ~TSTATE_PEF; + } + if (err) + goto do_sigsegv; + + return; +do_sigsegv: + force_sig(SIGSEGV, current); +} + +asmlinkage void sparc64_get_context(struct pt_regs *regs) +{ + struct ucontext __user *ucp = (struct ucontext __user *) + regs->u_regs[UREG_I0]; + mc_gregset_t __user *grp; + mcontext_t __user *mcp; + unsigned long fp, i7; + unsigned char fenab; + int err; + + synchronize_user_stack(); + if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp))) + goto do_sigsegv; + +#if 1 + fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */ +#else + fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF); +#endif + + mcp = &ucp->uc_mcontext; + grp = &mcp->mc_gregs; + + /* Skip over the trap instruction, first. */ + if (test_thread_flag(TIF_32BIT)) { + regs->tpc = (regs->tnpc & 0xffffffff); + regs->tnpc = (regs->tnpc + 4) & 0xffffffff; + } else { + regs->tpc = regs->tnpc; + regs->tnpc += 4; + } + err = 0; + if (_NSIG_WORDS == 1) + err |= __put_user(current->blocked.sig[0], + (unsigned long __user *)&ucp->uc_sigmask); + else + err |= __copy_to_user(&ucp->uc_sigmask, ¤t->blocked, + sizeof(sigset_t)); + + err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE])); + err |= __put_user(regs->tpc, &((*grp)[MC_PC])); + err |= __put_user(regs->tnpc, &((*grp)[MC_NPC])); + err |= __put_user(regs->y, &((*grp)[MC_Y])); + err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1])); + err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2])); + err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3])); + err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4])); + err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5])); + err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6])); + err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7])); + err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0])); + err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1])); + err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2])); + err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3])); + err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4])); + err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5])); + err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6])); + err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7])); + + err |= __get_user(fp, + (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); + err |= __get_user(i7, + (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); + err |= __put_user(fp, &(mcp->mc_fp)); + err |= __put_user(i7, &(mcp->mc_i7)); + + err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab)); + if (fenab) { + unsigned long *fpregs = current_thread_info()->fpregs; + unsigned long fprs; + + fprs = current_thread_info()->fpsaved[0]; + if (fprs & FPRS_DL) + err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs, + (sizeof(unsigned int) * 32)); + if (fprs & FPRS_DU) + err |= copy_to_user( + ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16, + (sizeof(unsigned int) * 32)); + err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr)); + err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr)); + err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs)); + } + if (err) + goto do_sigsegv; + + return; +do_sigsegv: + force_sig(SIGSEGV, current); +} + +struct rt_signal_frame { + struct sparc_stackf ss; + siginfo_t info; + struct pt_regs regs; + __siginfo_fpu_t __user *fpu_save; + stack_t stack; + sigset_t mask; + __siginfo_fpu_t fpu_state; +}; + +/* Align macros */ +#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; + +#ifdef CONFIG_SPARC32_COMPAT + if (test_thread_flag(TIF_32BIT)) { + extern asmlinkage void _sigpause32_common(compat_old_sigset_t, + struct pt_regs *); + _sigpause32_common(set, regs); + return; + } +#endif + set &= _BLOCKABLE; + spin_lock_irq(¤t->sighand->siglock); + saveset = current->blocked; + siginitset(¤t->blocked, set); + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + + if (test_thread_flag(TIF_32BIT)) { + regs->tpc = (regs->tnpc & 0xffffffff); + regs->tnpc = (regs->tnpc + 4) & 0xffffffff; + } else { + regs->tpc = regs->tnpc; + regs->tnpc += 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->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); + 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 __user *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->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); + regs->u_regs[UREG_I0] = EINVAL; + return; + } + if (copy_from_user(&set, uset, sizeof(set))) { + regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); + regs->u_regs[UREG_I0] = EFAULT; + return; + } + + sigdelsetmask(&set, ~_BLOCKABLE); + spin_lock_irq(¤t->sighand->siglock); + oldset = current->blocked; + current->blocked = set; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + + if (test_thread_flag(TIF_32BIT)) { + regs->tpc = (regs->tnpc & 0xffffffff); + regs->tnpc = (regs->tnpc + 4) & 0xffffffff; + } else { + regs->tpc = regs->tnpc; + regs->tnpc += 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->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); + 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 __user *fpu) +{ + unsigned long *fpregs = current_thread_info()->fpregs; + unsigned long fprs; + int err; + + err = __get_user(fprs, &fpu->si_fprs); + fprs_write(0); + regs->tstate &= ~TSTATE_PEF; + if (fprs & FPRS_DL) + err |= copy_from_user(fpregs, &fpu->si_float_regs[0], + (sizeof(unsigned int) * 32)); + if (fprs & FPRS_DU) + err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32], + (sizeof(unsigned int) * 32)); + err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr); + err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr); + current_thread_info()->fpsaved[0] |= fprs; + return err; +} + +void do_rt_sigreturn(struct pt_regs *regs) +{ + struct rt_signal_frame __user *sf; + unsigned long tpc, tnpc, tstate; + __siginfo_fpu_t __user *fpu_save; + mm_segment_t old_fs; + sigset_t set; + stack_t st; + int err; + + /* Always make any pending restarted system calls return -EINTR */ + current_thread_info()->restart_block.fn = do_no_restart_syscall; + + synchronize_user_stack (); + sf = (struct rt_signal_frame __user *) + (regs->u_regs [UREG_FP] + STACK_BIAS); + + /* 1. Make sure we are not getting garbage from the user */ + if (((unsigned long) sf) & 3) + goto segv; + + err = get_user(tpc, &sf->regs.tpc); + err |= __get_user(tnpc, &sf->regs.tnpc); + if (test_thread_flag(TIF_32BIT)) { + tpc &= 0xffffffff; + tnpc &= 0xffffffff; + } + err |= ((tpc | tnpc) & 3); + + /* 2. Restore the state */ + err |= __get_user(regs->y, &sf->regs.y); + err |= __get_user(tstate, &sf->regs.tstate); + err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs)); + + /* User can only change condition codes and %asi in %tstate. */ + regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); + regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); + + 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->tpc = tpc; + regs->tnpc = tnpc; + + /* 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 int invalid_frame_pointer(void __user *fp, int fplen) +{ + if (((unsigned long) fp) & 7) + return 1; + return 0; +} + +static inline int +save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) +{ + unsigned long *fpregs = (unsigned long *)(regs+1); + 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 __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize) +{ + unsigned long sp; + + sp = regs->u_regs[UREG_FP] + STACK_BIAS; + + /* This is the X/Open sanctioned signal stack switching. */ + if (ka->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_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, err; + + /* 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_frame __user *) + get_sigframe(ka, regs, sigframe_size); + + if (invalid_frame_pointer (sf, sigframe_size)) + goto sigill; + + if (get_thread_wsaved() != 0) + goto sigill; + + /* 2. Save the current process state */ + err = copy_to_user(&sf->regs, regs, sizeof (*regs)); + + if (current_thread_info()->fpsaved[0] & FPRS_FEF) { + err |= save_fpu_state(regs, &sf->fpu_state); + err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save); + } else { + err |= __put_user(0, &sf->fpu_save); + } + + /* 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->mask, oldset, sizeof(sigset_t)); + + err |= copy_in_user((u64 __user *)sf, + (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS), + sizeof(struct reg_window)); + + if (info) + err |= copy_siginfo_to_user(&sf->info, info); + else { + err |= __put_user(signo, &sf->info.si_signo); + err |= __put_user(SI_NOINFO, &sf->info.si_code); + } + if (err) + goto sigsegv; + + /* 3. signal handler back-trampoline and parameters */ + regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS; + regs->u_regs[UREG_I0] = signo; + regs->u_regs[UREG_I1] = (unsigned long) &sf->info; + + /* The sigcontext is passed in this way because of how it + * is defined in GLIBC's /usr/include/bits/sigcontext.h + * for sparc64. It includes the 128 bytes of siginfo_t. + */ + regs->u_regs[UREG_I2] = (unsigned long) &sf->info; + + /* 5. 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; + } + /* 4. return to kernel instructions */ + regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; + return; + +sigill: + do_exit(SIGILL); +sigsegv: + force_sigsegv(signo, current); +} + +static inline void handle_signal(unsigned long signr, struct k_sigaction *ka, + siginfo_t *info, + sigset_t *oldset, struct pt_regs *regs) +{ + setup_rt_frame(ka, regs, signr, oldset, + (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL); + if (!(ka->sa.sa_flags & SA_NOMASK)) { + spin_lock_irq(¤t->sighand->siglock); + sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); + 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->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); + break; + case ERESTARTSYS: + if (!(sa->sa_flags & SA_RESTART)) + goto no_system_call_restart; + /* fallthrough */ + case ERESTARTNOINTR: + regs->u_regs[UREG_I0] = orig_i0; + regs->tpc -= 4; + regs->tnpc -= 4; + } +} + +/* Note that 'init' is a special process: it doesn't get signals it doesn't + * want to handle. Thus you cannot kill init even with a SIGKILL even by + * mistake. + */ +static int do_signal(sigset_t *oldset, struct pt_regs * regs, + unsigned long orig_i0, int restart_syscall) +{ + siginfo_t info; + struct signal_deliver_cookie cookie; + struct k_sigaction ka; + int signr; + + cookie.restart_syscall = restart_syscall; + cookie.orig_i0 = orig_i0; + + if (!oldset) + oldset = ¤t->blocked; + +#ifdef CONFIG_SPARC32_COMPAT + if (test_thread_flag(TIF_32BIT)) { + extern int do_signal32(sigset_t *, struct pt_regs *, + unsigned long, int); + return do_signal32(oldset, regs, orig_i0, + cookie.restart_syscall); + } +#endif + + signr = get_signal_to_deliver(&info, &ka, regs, &cookie); + if (signr > 0) { + if (cookie.restart_syscall) + syscall_restart(orig_i0, regs, &ka.sa); + handle_signal(signr, &ka, &info, oldset, regs); + return 1; + } + if (cookie.restart_syscall && + (regs->u_regs[UREG_I0] == ERESTARTNOHAND || + regs->u_regs[UREG_I0] == ERESTARTSYS || + regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { + /* replay the system call when we are done */ + regs->u_regs[UREG_I0] = cookie.orig_i0; + regs->tpc -= 4; + regs->tnpc -= 4; + } + if (cookie.restart_syscall && + regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { + regs->u_regs[UREG_G1] = __NR_restart_syscall; + regs->tpc -= 4; + regs->tnpc -= 4; + } + return 0; +} + +void do_notify_resume(sigset_t *oldset, struct pt_regs *regs, + unsigned long orig_i0, int restart_syscall, + unsigned long thread_info_flags) +{ + if (thread_info_flags & _TIF_SIGPENDING) + do_signal(oldset, regs, orig_i0, restart_syscall); +} + +void ptrace_signal_deliver(struct pt_regs *regs, void *cookie) +{ + struct signal_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->tpc -= 4; + regs->tnpc -= 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->tpc -= 4; + regs->tnpc -= 4; + cp->restart_syscall = 0; + } +} |