230 lines
6.3 KiB
C
230 lines
6.3 KiB
C
/*
|
|
* Copyright (C) 2003 Broadcom Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
#include <linux/cache.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/smp.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/compat.h>
|
|
#include <linux/bitops.h>
|
|
|
|
#include <asm/abi.h>
|
|
#include <asm/asm.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/compat-signal.h>
|
|
#include <asm/sim.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/ucontext.h>
|
|
#include <asm/fpu.h>
|
|
#include <asm/cpu-features.h>
|
|
#include <asm/war.h>
|
|
#include <asm/vdso.h>
|
|
|
|
#include "signal-common.h"
|
|
|
|
/*
|
|
* Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
|
|
*/
|
|
#define __NR_N32_restart_syscall 6214
|
|
|
|
extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
|
|
extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *);
|
|
|
|
|
|
/* IRIX compatible stack_t */
|
|
typedef struct sigaltstack32 {
|
|
s32 ss_sp;
|
|
compat_size_t ss_size;
|
|
int ss_flags;
|
|
} stack32_t;
|
|
|
|
struct ucontextn32 {
|
|
u32 uc_flags;
|
|
s32 uc_link;
|
|
stack32_t uc_stack;
|
|
struct sigcontext uc_mcontext;
|
|
compat_sigset_t uc_sigmask; /* mask last for extensibility */
|
|
};
|
|
|
|
struct rt_sigframe_n32 {
|
|
u32 rs_ass[4]; /* argument save space for o32 */
|
|
u32 rs_pad[2]; /* Was: signal trampoline */
|
|
struct compat_siginfo rs_info;
|
|
struct ucontextn32 rs_uc;
|
|
};
|
|
|
|
extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat);
|
|
|
|
asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
|
|
{
|
|
compat_sigset_t __user *unewset;
|
|
compat_sigset_t uset;
|
|
size_t sigsetsize;
|
|
sigset_t newset;
|
|
|
|
/* XXX Don't preclude handling different sized sigset_t's. */
|
|
sigsetsize = regs.regs[5];
|
|
if (sigsetsize != sizeof(sigset_t))
|
|
return -EINVAL;
|
|
|
|
unewset = (compat_sigset_t __user *) regs.regs[4];
|
|
if (copy_from_user(&uset, unewset, sizeof(uset)))
|
|
return -EFAULT;
|
|
sigset_from_compat(&newset, &uset);
|
|
sigdelsetmask(&newset, ~_BLOCKABLE);
|
|
|
|
spin_lock_irq(¤t->sighand->siglock);
|
|
current->saved_sigmask = current->blocked;
|
|
current->blocked = newset;
|
|
recalc_sigpending();
|
|
spin_unlock_irq(¤t->sighand->siglock);
|
|
|
|
current->state = TASK_INTERRUPTIBLE;
|
|
schedule();
|
|
set_thread_flag(TIF_RESTORE_SIGMASK);
|
|
return -ERESTARTNOHAND;
|
|
}
|
|
|
|
asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
|
|
{
|
|
struct rt_sigframe_n32 __user *frame;
|
|
mm_segment_t old_fs;
|
|
sigset_t set;
|
|
stack_t st;
|
|
s32 sp;
|
|
int sig;
|
|
|
|
frame = (struct rt_sigframe_n32 __user *) regs.regs[29];
|
|
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
|
|
goto badframe;
|
|
if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
|
|
goto badframe;
|
|
|
|
sigdelsetmask(&set, ~_BLOCKABLE);
|
|
spin_lock_irq(¤t->sighand->siglock);
|
|
current->blocked = set;
|
|
recalc_sigpending();
|
|
spin_unlock_irq(¤t->sighand->siglock);
|
|
|
|
sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext);
|
|
if (sig < 0)
|
|
goto badframe;
|
|
else if (sig)
|
|
force_sig(sig, current);
|
|
|
|
/* The ucontext contains a stack32_t, so we must convert! */
|
|
if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp))
|
|
goto badframe;
|
|
st.ss_sp = (void __user *)(long) sp;
|
|
if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size))
|
|
goto badframe;
|
|
if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags))
|
|
goto badframe;
|
|
|
|
/* 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((stack_t __user *)&st, NULL, regs.regs[29]);
|
|
set_fs(old_fs);
|
|
|
|
|
|
/*
|
|
* Don't let your children do this ...
|
|
*/
|
|
__asm__ __volatile__(
|
|
"move\t$29, %0\n\t"
|
|
"j\tsyscall_exit"
|
|
:/* no outputs */
|
|
:"r" (®s));
|
|
/* Unreached */
|
|
|
|
badframe:
|
|
force_sig(SIGSEGV, current);
|
|
}
|
|
|
|
static int setup_rt_frame_n32(void *sig_return, struct k_sigaction *ka,
|
|
struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info)
|
|
{
|
|
struct rt_sigframe_n32 __user *frame;
|
|
int err = 0;
|
|
s32 sp;
|
|
|
|
frame = get_sigframe(ka, regs, sizeof(*frame));
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
|
|
goto give_sigsegv;
|
|
|
|
/* Create siginfo. */
|
|
err |= copy_siginfo_to_user32(&frame->rs_info, info);
|
|
|
|
/* Create the ucontext. */
|
|
err |= __put_user(0, &frame->rs_uc.uc_flags);
|
|
err |= __put_user(0, &frame->rs_uc.uc_link);
|
|
sp = (int) (long) current->sas_ss_sp;
|
|
err |= __put_user(sp,
|
|
&frame->rs_uc.uc_stack.ss_sp);
|
|
err |= __put_user(sas_ss_flags(regs->regs[29]),
|
|
&frame->rs_uc.uc_stack.ss_flags);
|
|
err |= __put_user(current->sas_ss_size,
|
|
&frame->rs_uc.uc_stack.ss_size);
|
|
err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
|
|
err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
|
|
|
|
if (err)
|
|
goto give_sigsegv;
|
|
|
|
/*
|
|
* Arguments to signal handler:
|
|
*
|
|
* a0 = signal number
|
|
* a1 = 0 (should be cause)
|
|
* a2 = pointer to ucontext
|
|
*
|
|
* $25 and c0_epc point to the signal handler, $29 points to
|
|
* the struct rt_sigframe.
|
|
*/
|
|
regs->regs[ 4] = signr;
|
|
regs->regs[ 5] = (unsigned long) &frame->rs_info;
|
|
regs->regs[ 6] = (unsigned long) &frame->rs_uc;
|
|
regs->regs[29] = (unsigned long) frame;
|
|
regs->regs[31] = (unsigned long) sig_return;
|
|
regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
|
|
|
|
DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
|
|
current->comm, current->pid,
|
|
frame, regs->cp0_epc, regs->regs[31]);
|
|
|
|
return 0;
|
|
|
|
give_sigsegv:
|
|
force_sigsegv(signr, current);
|
|
return -EFAULT;
|
|
}
|
|
|
|
struct mips_abi mips_abi_n32 = {
|
|
.setup_rt_frame = setup_rt_frame_n32,
|
|
.rt_signal_return_offset =
|
|
offsetof(struct mips_vdso, n32_rt_signal_trampoline),
|
|
.restart = __NR_N32_restart_syscall
|
|
};
|