diff options
Diffstat (limited to 'arch/mips/kernel/signal_n32.c')
| -rw-r--r-- | arch/mips/kernel/signal_n32.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/arch/mips/kernel/signal_n32.c b/arch/mips/kernel/signal_n32.c new file mode 100644 index 00000000..86eb4b04 --- /dev/null +++ b/arch/mips/kernel/signal_n32.c @@ -0,0 +1,223 @@ +/* + * 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); + + current->saved_sigmask = current->blocked; + set_current_blocked(&newset); + + 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); + set_current_blocked(&set); + + 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 +}; |