d814c28cec
This is a follow on to the vdso patch. Since all processes now have signal trampolines permanently mapped, we can use those instead of putting the trampoline on the stack and invalidating the corresponding icache across all CPUs. We also get rid of a bunch of ICACHE_REFILLS_WORKAROUND_WAR code. [Ralf: GDB 7.1 which has the necessary modifications to allow backtracing over signal frames will supposedly be released tomorrow. The old signal frame format obsoleted by this patch exists in two variations, for sane processors and for those requiring ICACHE_REFILLS_WORKAROUND_WAR. So there was never a GDB which did support backtracing over signal frames on all MIPS systems. This convinved me this series should be applied and pushed upstream as soon as possible.] Signed-off-by: David Daney <ddaney@caviumnetworks.com> To: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/974/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
226 lines
6.2 KiB
C
226 lines
6.2 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/mm.h>
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#include <linux/smp.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/abi.h>
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#include <asm/asm.h>
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#include <asm/cacheflush.h>
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#include <asm/compat-signal.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 <asm/vdso.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_restart_syscall 6214
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extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
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extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *);
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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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compat_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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u32 rs_pad[2]; /* Was: signal trampoline */
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struct compat_siginfo rs_info;
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struct ucontextn32 rs_uc;
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};
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extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat);
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asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
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{
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compat_sigset_t __user *unewset;
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compat_sigset_t 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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asmlinkage void 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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int sig;
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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_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
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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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sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext);
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if (sig < 0)
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goto badframe;
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else if (sig)
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force_sig(sig, current);
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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 __user *)(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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static int setup_rt_frame_n32(void *sig_return, 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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/* Create siginfo. */
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err |= copy_siginfo_to_user32(&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_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, 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) sig_return;
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regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
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DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
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current->comm, current->pid,
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frame, regs->cp0_epc, regs->regs[31]);
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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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struct mips_abi mips_abi_n32 = {
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.setup_rt_frame = setup_rt_frame_n32,
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.rt_signal_return_offset =
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offsetof(struct mips_vdso, n32_rt_signal_trampoline),
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.restart = __NR_N32_restart_syscall
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};
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