/* * 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/smp_lock.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/asm.h> #include <asm/cacheflush.h> #include <asm/sim.h> #include <asm/uaccess.h> #include <asm/ucontext.h> #include <asm/system.h> #include <asm/fpu.h> #include <asm/cpu-features.h> #include <asm/war.h> #include "signal-common.h" /* * Including <asm/unistd.h> would give use the 64-bit syscall numbers ... */ #define __NR_N32_rt_sigreturn 6211 #define __NR_N32_restart_syscall 6214 #define DEBUG_SIG 0 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) /* 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; sigset_t uc_sigmask; /* mask last for extensibility */ }; struct rt_sigframe_n32 { u32 rs_ass[4]; /* argument save space for o32 */ #if ICACHE_REFILLS_WORKAROUND_WAR u32 rs_pad[2]; #else u32 rs_code[2]; /* signal trampoline */ #endif struct siginfo rs_info; struct ucontextn32 rs_uc; #if ICACHE_REFILLS_WORKAROUND_WAR u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */ #endif }; extern void sigset_from_compat (sigset_t *set, compat_sigset_t *compat); save_static_function(sysn32_rt_sigsuspend); __attribute_used__ noinline static 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; } save_static_function(sysn32_rt_sigreturn); __attribute_used__ noinline static void _sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) { struct rt_sigframe_n32 __user *frame; sigset_t set; stack_t st; s32 sp; frame = (struct rt_sigframe_n32 __user *) regs.regs[29]; if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) goto badframe; if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) goto badframe; sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sighand->siglock); current->blocked = set; recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext)) goto badframe; /* 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. */ do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); /* * 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); } int setup_rt_frame_n32(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; install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn); /* Create siginfo. */ err |= copy_siginfo_to_user(&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_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*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) frame->rs_code; regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; #if DEBUG_SIG printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n", current->comm, current->pid, frame, regs->cp0_epc, regs->regs[31]); #endif return 0; give_sigsegv: force_sigsegv(signr, current); return -EFAULT; }