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/system.h> 39#include <asm/fpu.h> 40#include <asm/cpu-features.h> 41#include <asm/war.h> 42#include <asm/vdso.h> 43 44#include "signal-common.h" 45 46/* 47 * Including <asm/unistd.h> would give use the 64-bit syscall numbers ... 48 */ 49#define __NR_N32_restart_syscall 6214 50 51extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *); 52extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *); 53 54 55/* IRIX compatible stack_t */ 56typedef struct sigaltstack32 { 57 s32 ss_sp; 58 compat_size_t ss_size; 59 int ss_flags; 60} stack32_t; 61 62struct ucontextn32 { 63 u32 uc_flags; 64 s32 uc_link; 65 stack32_t uc_stack; 66 struct sigcontext uc_mcontext; 67 compat_sigset_t uc_sigmask; /* mask last for extensibility */ 68}; 69 70struct rt_sigframe_n32 { 71 u32 rs_ass[4]; /* argument save space for o32 */ 72 u32 rs_pad[2]; /* Was: signal trampoline */ 73 struct compat_siginfo rs_info; 74 struct ucontextn32 rs_uc; 75}; 76 77extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat); 78 79asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) 80{ 81 compat_sigset_t __user *unewset; 82 compat_sigset_t uset; 83 size_t sigsetsize; 84 sigset_t newset; 85 86 sigsetsize = regs.regs[5]; 87 if (sigsetsize != sizeof(sigset_t)) 88 return -EINVAL; 89 90 unewset = (compat_sigset_t __user *) regs.regs[4]; 91 if (copy_from_user(&uset, unewset, sizeof(uset))) 92 return -EFAULT; 93 sigset_from_compat(&newset, &uset); 94 sigdelsetmask(&newset, ~_BLOCKABLE); 95 96 spin_lock_irq(¤t->sighand->siglock); 97 current->saved_sigmask = current->blocked; 98 current->blocked = newset; 99 recalc_sigpending(); 100 spin_unlock_irq(¤t->sighand->siglock); 101 102 current->state = TASK_INTERRUPTIBLE; 103 schedule(); 104 set_thread_flag(TIF_RESTORE_SIGMASK); 105 return -ERESTARTNOHAND; 106} 107 108asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) 109{ 110 struct rt_sigframe_n32 __user *frame; 111 mm_segment_t old_fs; 112 sigset_t set; 113 stack_t st; 114 s32 sp; 115 int sig; 116 117 frame = (struct rt_sigframe_n32 __user *) regs.regs[29]; 118 if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 119 goto badframe; 120 if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask)) 121 goto badframe; 122 123 sigdelsetmask(&set, ~_BLOCKABLE); 124 spin_lock_irq(¤t->sighand->siglock); 125 current->blocked = set; 126 recalc_sigpending(); 127 spin_unlock_irq(¤t->sighand->siglock); 128 129 sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); 130 if (sig < 0) 131 goto badframe; 132 else if (sig) 133 force_sig(sig, current); 134 135 /* The ucontext contains a stack32_t, so we must convert! */ 136 if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) 137 goto badframe; 138 st.ss_sp = (void __user *)(long) sp; 139 if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) 140 goto badframe; 141 if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) 142 goto badframe; 143 144 /* It is more difficult to avoid calling this function than to 145 call it and ignore errors. */ 146 old_fs = get_fs(); 147 set_fs(KERNEL_DS); 148 do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); 149 set_fs(old_fs); 150 151 152 /* 153 * Don't let your children do this ... 154 */ 155 __asm__ __volatile__( 156 "move\t$29, %0\n\t" 157 "j\tsyscall_exit" 158 :/* no outputs */ 159 :"r" (®s)); 160 /* Unreached */ 161 162badframe: 163 force_sig(SIGSEGV, current); 164} 165 166static int setup_rt_frame_n32(void *sig_return, struct k_sigaction *ka, 167 struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info) 168{ 169 struct rt_sigframe_n32 __user *frame; 170 int err = 0; 171 s32 sp; 172 173 frame = get_sigframe(ka, regs, sizeof(*frame)); 174 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) 175 goto give_sigsegv; 176 177 /* Create siginfo. */ 178 err |= copy_siginfo_to_user32(&frame->rs_info, info); 179 180 /* Create the ucontext. */ 181 err |= __put_user(0, &frame->rs_uc.uc_flags); 182 err |= __put_user(0, &frame->rs_uc.uc_link); 183 sp = (int) (long) current->sas_ss_sp; 184 err |= __put_user(sp, 185 &frame->rs_uc.uc_stack.ss_sp); 186 err |= __put_user(sas_ss_flags(regs->regs[29]), 187 &frame->rs_uc.uc_stack.ss_flags); 188 err |= __put_user(current->sas_ss_size, 189 &frame->rs_uc.uc_stack.ss_size); 190 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); 191 err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set); 192 193 if (err) 194 goto give_sigsegv; 195 196 /* 197 * Arguments to signal handler: 198 * 199 * a0 = signal number 200 * a1 = 0 (should be cause) 201 * a2 = pointer to ucontext 202 * 203 * $25 and c0_epc point to the signal handler, $29 points to 204 * the struct rt_sigframe. 205 */ 206 regs->regs[ 4] = signr; 207 regs->regs[ 5] = (unsigned long) &frame->rs_info; 208 regs->regs[ 6] = (unsigned long) &frame->rs_uc; 209 regs->regs[29] = (unsigned long) frame; 210 regs->regs[31] = (unsigned long) sig_return; 211 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; 212 213 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", 214 current->comm, current->pid, 215 frame, regs->cp0_epc, regs->regs[31]); 216 217 return 0; 218 219give_sigsegv: 220 force_sigsegv(signr, current); 221 return -EFAULT; 222} 223 224struct mips_abi mips_abi_n32 = { 225 .setup_rt_frame = setup_rt_frame_n32, 226 .rt_signal_return_offset = 227 offsetof(struct mips_vdso, n32_rt_signal_trampoline), 228 .restart = __NR_N32_restart_syscall 229}; 230