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 }; 161