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 set_current_blocked(&set); 113 114 sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); 115 if (sig < 0) 116 goto badframe; 117 else if (sig) 118 force_sig(sig, current); 119 120 /* The ucontext contains a stack32_t, so we must convert! */ 121 if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) 122 goto badframe; 123 st.ss_sp = (void __user *)(long) sp; 124 if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) 125 goto badframe; 126 if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) 127 goto badframe; 128 129 /* It is more difficult to avoid calling this function than to 130 call it and ignore errors. */ 131 old_fs = get_fs(); 132 set_fs(KERNEL_DS); 133 do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); 134 set_fs(old_fs); 135 136 137 /* 138 * Don't let your children do this ... 139 */ 140 __asm__ __volatile__( 141 "move\t$29, %0\n\t" 142 "j\tsyscall_exit" 143 :/* no outputs */ 144 :"r" (®s)); 145 /* Unreached */ 146 147 badframe: 148 force_sig(SIGSEGV, current); 149 } 150 151 static int setup_rt_frame_n32(void *sig_return, struct k_sigaction *ka, 152 struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info) 153 { 154 struct rt_sigframe_n32 __user *frame; 155 int err = 0; 156 s32 sp; 157 158 frame = get_sigframe(ka, regs, sizeof(*frame)); 159 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) 160 goto give_sigsegv; 161 162 /* Create siginfo. */ 163 err |= copy_siginfo_to_user32(&frame->rs_info, info); 164 165 /* Create the ucontext. */ 166 err |= __put_user(0, &frame->rs_uc.uc_flags); 167 err |= __put_user(0, &frame->rs_uc.uc_link); 168 sp = (int) (long) current->sas_ss_sp; 169 err |= __put_user(sp, 170 &frame->rs_uc.uc_stack.ss_sp); 171 err |= __put_user(sas_ss_flags(regs->regs[29]), 172 &frame->rs_uc.uc_stack.ss_flags); 173 err |= __put_user(current->sas_ss_size, 174 &frame->rs_uc.uc_stack.ss_size); 175 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); 176 err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set); 177 178 if (err) 179 goto give_sigsegv; 180 181 /* 182 * Arguments to signal handler: 183 * 184 * a0 = signal number 185 * a1 = 0 (should be cause) 186 * a2 = pointer to ucontext 187 * 188 * $25 and c0_epc point to the signal handler, $29 points to 189 * the struct rt_sigframe. 190 */ 191 regs->regs[ 4] = signr; 192 regs->regs[ 5] = (unsigned long) &frame->rs_info; 193 regs->regs[ 6] = (unsigned long) &frame->rs_uc; 194 regs->regs[29] = (unsigned long) frame; 195 regs->regs[31] = (unsigned long) sig_return; 196 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; 197 198 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", 199 current->comm, current->pid, 200 frame, regs->cp0_epc, regs->regs[31]); 201 202 return 0; 203 204 give_sigsegv: 205 force_sigsegv(signr, current); 206 return -EFAULT; 207 } 208 209 struct mips_abi mips_abi_n32 = { 210 .setup_rt_frame = setup_rt_frame_n32, 211 .rt_signal_return_offset = 212 offsetof(struct mips_vdso, n32_rt_signal_trampoline), 213 .restart = __NR_N32_restart_syscall 214 }; 215