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