| /* |
| * 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 <linux/uaccess.h> |
| #include <asm/ucontext.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_restart_syscall 6214 |
| |
| extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *); |
| extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *); |
| |
| struct ucontextn32 { |
| u32 uc_flags; |
| s32 uc_link; |
| compat_stack_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; |
| }; |
| |
| asmlinkage void sysn32_rt_sigreturn(void) |
| { |
| struct rt_sigframe_n32 __user *frame; |
| struct pt_regs *regs; |
| sigset_t set; |
| int sig; |
| |
| regs = current_pt_regs(); |
| 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; |
| |
| set_current_blocked(&set); |
| |
| sig = restore_sigcontext(regs, &frame->rs_uc.uc_mcontext); |
| if (sig < 0) |
| goto badframe; |
| else if (sig) |
| force_sig(sig, current); |
| |
| if (compat_restore_altstack(&frame->rs_uc.uc_stack)) |
| goto badframe; |
| |
| /* |
| * Don't let your children do this ... |
| */ |
| __asm__ __volatile__( |
| "move\t$29, %0\n\t" |
| "j\tsyscall_exit" |
| : /* no outputs */ |
| : "r" (regs)); |
| /* Unreached */ |
| |
| badframe: |
| force_sig(SIGSEGV, current); |
| } |
| |
| static int setup_rt_frame_n32(void *sig_return, struct ksignal *ksig, |
| struct pt_regs *regs, sigset_t *set) |
| { |
| struct rt_sigframe_n32 __user *frame; |
| int err = 0; |
| |
| frame = get_sigframe(ksig, regs, sizeof(*frame)); |
| if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) |
| return -EFAULT; |
| |
| /* Create siginfo. */ |
| err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info); |
| |
| /* Create the ucontext. */ |
| err |= __put_user(0, &frame->rs_uc.uc_flags); |
| err |= __put_user(0, &frame->rs_uc.uc_link); |
| err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]); |
| err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); |
| err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set); |
| |
| if (err) |
| return -EFAULT; |
| |
| /* |
| * 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] = ksig->sig; |
| 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) ksig->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; |
| } |
| |
| struct mips_abi mips_abi_n32 = { |
| .setup_rt_frame = setup_rt_frame_n32, |
| .restart = __NR_N32_restart_syscall, |
| |
| .off_sc_fpregs = offsetof(struct sigcontext, sc_fpregs), |
| .off_sc_fpc_csr = offsetof(struct sigcontext, sc_fpc_csr), |
| .off_sc_used_math = offsetof(struct sigcontext, sc_used_math), |
| |
| .vdso = &vdso_image_n32, |
| }; |