82ad93f4a0
Originally found through an oops in the Gentoo N32 userland build; patch based on original patch by Daniel Jacobwitz. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
228 lines
6.3 KiB
C
228 lines
6.3 KiB
C
/*
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* Copyright (C) 2003 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/cache.h>
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/errno.h>
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#include <linux/wait.h>
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#include <linux/ptrace.h>
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#include <linux/unistd.h>
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#include <linux/compat.h>
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#include <linux/bitops.h>
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#include <asm/asm.h>
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#include <asm/cacheflush.h>
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#include <asm/sim.h>
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#include <asm/uaccess.h>
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#include <asm/ucontext.h>
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#include <asm/system.h>
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#include <asm/fpu.h>
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#include <asm/cpu-features.h>
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#include <asm/war.h>
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#include "signal-common.h"
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/*
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* Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
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*/
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#define __NR_N32_rt_sigreturn 6211
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#define __NR_N32_restart_syscall 6214
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#define DEBUG_SIG 0
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#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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/* IRIX compatible stack_t */
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typedef struct sigaltstack32 {
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s32 ss_sp;
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compat_size_t ss_size;
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int ss_flags;
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} stack32_t;
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struct ucontextn32 {
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u32 uc_flags;
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s32 uc_link;
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stack32_t uc_stack;
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struct sigcontext uc_mcontext;
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sigset_t uc_sigmask; /* mask last for extensibility */
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};
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struct rt_sigframe_n32 {
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u32 rs_ass[4]; /* argument save space for o32 */
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#if ICACHE_REFILLS_WORKAROUND_WAR
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u32 rs_pad[2];
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#else
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u32 rs_code[2]; /* signal trampoline */
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#endif
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struct siginfo rs_info;
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struct ucontextn32 rs_uc;
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#if ICACHE_REFILLS_WORKAROUND_WAR
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u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */
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#endif
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};
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extern void sigset_from_compat (sigset_t *set, compat_sigset_t *compat);
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save_static_function(sysn32_rt_sigsuspend);
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__attribute_used__ noinline static int
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_sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
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{
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compat_sigset_t __user *unewset, uset;
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size_t sigsetsize;
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sigset_t newset;
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/* XXX Don't preclude handling different sized sigset_t's. */
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sigsetsize = regs.regs[5];
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if (sigsetsize != sizeof(sigset_t))
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return -EINVAL;
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unewset = (compat_sigset_t __user *) regs.regs[4];
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if (copy_from_user(&uset, unewset, sizeof(uset)))
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return -EFAULT;
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sigset_from_compat (&newset, &uset);
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sigdelsetmask(&newset, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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current->saved_sigmask = current->blocked;
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current->blocked = newset;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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set_thread_flag(TIF_RESTORE_SIGMASK);
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return -ERESTARTNOHAND;
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}
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save_static_function(sysn32_rt_sigreturn);
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__attribute_used__ noinline static void
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_sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
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{
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struct rt_sigframe_n32 __user *frame;
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sigset_t set;
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stack_t st;
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s32 sp;
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frame = (struct rt_sigframe_n32 __user *) regs.regs[29];
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if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
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goto badframe;
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if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
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goto badframe;
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sigdelsetmask(&set, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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current->blocked = set;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext))
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goto badframe;
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/* The ucontext contains a stack32_t, so we must convert! */
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if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp))
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goto badframe;
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st.ss_sp = (void *)(long) sp;
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if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size))
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goto badframe;
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if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags))
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goto badframe;
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/* It is more difficult to avoid calling this function than to
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call it and ignore errors. */
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do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);
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/*
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* Don't let your children do this ...
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*/
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__asm__ __volatile__(
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"move\t$29, %0\n\t"
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"j\tsyscall_exit"
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:/* no outputs */
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:"r" (®s));
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/* Unreached */
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badframe:
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force_sig(SIGSEGV, current);
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}
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int setup_rt_frame_n32(struct k_sigaction * ka,
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struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info)
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{
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struct rt_sigframe_n32 __user *frame;
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int err = 0;
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s32 sp;
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frame = get_sigframe(ka, regs, sizeof(*frame));
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if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
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goto give_sigsegv;
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install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn);
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/* Create siginfo. */
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err |= copy_siginfo_to_user(&frame->rs_info, info);
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/* Create the ucontext. */
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err |= __put_user(0, &frame->rs_uc.uc_flags);
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err |= __put_user(0, &frame->rs_uc.uc_link);
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sp = (int) (long) current->sas_ss_sp;
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err |= __put_user(sp,
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&frame->rs_uc.uc_stack.ss_sp);
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err |= __put_user(sas_ss_flags(regs->regs[29]),
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&frame->rs_uc.uc_stack.ss_flags);
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err |= __put_user(current->sas_ss_size,
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&frame->rs_uc.uc_stack.ss_size);
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err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
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err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
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if (err)
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goto give_sigsegv;
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/*
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* Arguments to signal handler:
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*
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* a0 = signal number
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* a1 = 0 (should be cause)
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* a2 = pointer to ucontext
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*
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* $25 and c0_epc point to the signal handler, $29 points to
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* the struct rt_sigframe.
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*/
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regs->regs[ 4] = signr;
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regs->regs[ 5] = (unsigned long) &frame->rs_info;
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regs->regs[ 6] = (unsigned long) &frame->rs_uc;
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regs->regs[29] = (unsigned long) frame;
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regs->regs[31] = (unsigned long) frame->rs_code;
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regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
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#if DEBUG_SIG
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printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
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current->comm, current->pid,
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frame, regs->cp0_epc, regs->regs[31]);
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#endif
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return 0;
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give_sigsegv:
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force_sigsegv(signr, current);
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return -EFAULT;
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}
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