mirror of
https://github.com/torvalds/linux.git
synced 2024-11-11 22:51:42 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
689 lines
20 KiB
C
689 lines
20 KiB
C
/* $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;
|
|
}
|
|
}
|