| 1 | /* |
| 2 | * Copyright (C) 2003 Broadcom Corporation |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version 2 |
| 7 | * of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | #include <linux/cache.h> |
| 19 | #include <linux/sched.h> |
| 20 | #include <linux/mm.h> |
| 21 | #include <linux/smp.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/signal.h> |
| 24 | #include <linux/errno.h> |
| 25 | #include <linux/wait.h> |
| 26 | #include <linux/ptrace.h> |
| 27 | #include <linux/unistd.h> |
| 28 | #include <linux/compat.h> |
| 29 | #include <linux/bitops.h> |
| 30 | |
| 31 | #include <asm/abi.h> |
| 32 | #include <asm/asm.h> |
| 33 | #include <asm/cacheflush.h> |
| 34 | #include <asm/compat-signal.h> |
| 35 | #include <asm/sim.h> |
| 36 | #include <asm/uaccess.h> |
| 37 | #include <asm/ucontext.h> |
| 38 | #include <asm/fpu.h> |
| 39 | #include <asm/cpu-features.h> |
| 40 | #include <asm/war.h> |
| 41 | |
| 42 | #include "signal-common.h" |
| 43 | |
| 44 | /* |
| 45 | * Including <asm/unistd.h> would give use the 64-bit syscall numbers ... |
| 46 | */ |
| 47 | #define __NR_N32_restart_syscall 6214 |
| 48 | |
| 49 | extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *); |
| 50 | extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *); |
| 51 | |
| 52 | struct ucontextn32 { |
| 53 | u32 uc_flags; |
| 54 | s32 uc_link; |
| 55 | compat_stack_t uc_stack; |
| 56 | struct sigcontext uc_mcontext; |
| 57 | compat_sigset_t uc_sigmask; /* mask last for extensibility */ |
| 58 | }; |
| 59 | |
| 60 | struct rt_sigframe_n32 { |
| 61 | u32 rs_ass[4]; /* argument save space for o32 */ |
| 62 | u32 rs_pad[2]; /* Was: signal trampoline */ |
| 63 | struct compat_siginfo rs_info; |
| 64 | struct ucontextn32 rs_uc; |
| 65 | }; |
| 66 | |
| 67 | asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) |
| 68 | { |
| 69 | struct rt_sigframe_n32 __user *frame; |
| 70 | sigset_t set; |
| 71 | int sig; |
| 72 | |
| 73 | frame = (struct rt_sigframe_n32 __user *) regs.regs[29]; |
| 74 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 75 | goto badframe; |
| 76 | if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask)) |
| 77 | goto badframe; |
| 78 | |
| 79 | set_current_blocked(&set); |
| 80 | |
| 81 | sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); |
| 82 | if (sig < 0) |
| 83 | goto badframe; |
| 84 | else if (sig) |
| 85 | force_sig(sig, current); |
| 86 | |
| 87 | if (compat_restore_altstack(&frame->rs_uc.uc_stack)) |
| 88 | goto badframe; |
| 89 | |
| 90 | /* |
| 91 | * Don't let your children do this ... |
| 92 | */ |
| 93 | __asm__ __volatile__( |
| 94 | "move\t$29, %0\n\t" |
| 95 | "j\tsyscall_exit" |
| 96 | :/* no outputs */ |
| 97 | :"r" (®s)); |
| 98 | /* Unreached */ |
| 99 | |
| 100 | badframe: |
| 101 | force_sig(SIGSEGV, current); |
| 102 | } |
| 103 | |
| 104 | static int setup_rt_frame_n32(void *sig_return, struct ksignal *ksig, |
| 105 | struct pt_regs *regs, sigset_t *set) |
| 106 | { |
| 107 | struct rt_sigframe_n32 __user *frame; |
| 108 | int err = 0; |
| 109 | |
| 110 | frame = get_sigframe(ksig, regs, sizeof(*frame)); |
| 111 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) |
| 112 | return -EFAULT; |
| 113 | |
| 114 | /* Create siginfo. */ |
| 115 | err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info); |
| 116 | |
| 117 | /* Create the ucontext. */ |
| 118 | err |= __put_user(0, &frame->rs_uc.uc_flags); |
| 119 | err |= __put_user(0, &frame->rs_uc.uc_link); |
| 120 | err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]); |
| 121 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); |
| 122 | err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set); |
| 123 | |
| 124 | if (err) |
| 125 | return -EFAULT; |
| 126 | |
| 127 | /* |
| 128 | * Arguments to signal handler: |
| 129 | * |
| 130 | * a0 = signal number |
| 131 | * a1 = 0 (should be cause) |
| 132 | * a2 = pointer to ucontext |
| 133 | * |
| 134 | * $25 and c0_epc point to the signal handler, $29 points to |
| 135 | * the struct rt_sigframe. |
| 136 | */ |
| 137 | regs->regs[ 4] = ksig->sig; |
| 138 | regs->regs[ 5] = (unsigned long) &frame->rs_info; |
| 139 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; |
| 140 | regs->regs[29] = (unsigned long) frame; |
| 141 | regs->regs[31] = (unsigned long) sig_return; |
| 142 | regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; |
| 143 | |
| 144 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
| 145 | current->comm, current->pid, |
| 146 | frame, regs->cp0_epc, regs->regs[31]); |
| 147 | |
| 148 | return 0; |
| 149 | } |
| 150 | |
| 151 | struct mips_abi mips_abi_n32 = { |
| 152 | .setup_rt_frame = setup_rt_frame_n32, |
| 153 | .restart = __NR_N32_restart_syscall, |
| 154 | |
| 155 | .off_sc_fpregs = offsetof(struct sigcontext, sc_fpregs), |
| 156 | .off_sc_fpc_csr = offsetof(struct sigcontext, sc_fpc_csr), |
| 157 | .off_sc_used_math = offsetof(struct sigcontext, sc_used_math), |
| 158 | |
| 159 | .vdso = &vdso_image_n32, |
| 160 | }; |