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 51 extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *); 52 extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *); 53 54 55 /* IRIX compatible stack_t */ 56 typedef struct sigaltstack32 { 57 s32 ss_sp; 58 compat_size_t ss_size; 59 int ss_flags; 60 } stack32_t; 61 62 struct 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 70 struct 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 77 extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat); 78 79 asmlinkage 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 /* XXX Don't preclude handling different sized sigset_t's. */ 87 sigsetsize = regs.regs[5]; 88 if (sigsetsize != sizeof(sigset_t)) 89 return -EINVAL; 90 91 unewset = (compat_sigset_t __user *) regs.regs[4]; 92 if (copy_from_user(&uset, unewset, sizeof(uset))) 93 return -EFAULT; 94 sigset_from_compat(&newset, &uset); 95 sigdelsetmask(&newset, ~_BLOCKABLE); 96 97 spin_lock_irq(¤t->sighand->siglock); 98 current->saved_sigmask = current->blocked; 99 current->blocked = newset; 100 recalc_sigpending(); 101 spin_unlock_irq(¤t->sighand->siglock); 102 103 current->state = TASK_INTERRUPTIBLE; 104 schedule(); 105 set_thread_flag(TIF_RESTORE_SIGMASK); 106 return -ERESTARTNOHAND; 107 } 108 109 asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) 110 { 111 struct rt_sigframe_n32 __user *frame; 112 mm_segment_t old_fs; 113 sigset_t set; 114 stack_t st; 115 s32 sp; 116 int sig; 117 118 frame = (struct rt_sigframe_n32 __user *) regs.regs[29]; 119 if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 120 goto badframe; 121 if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask)) 122 goto badframe; 123 124 sigdelsetmask(&set, ~_BLOCKABLE); 125 spin_lock_irq(¤t->sighand->siglock); 126 current->blocked = set; 127 recalc_sigpending(); 128 spin_unlock_irq(¤t->sighand->siglock); 129 130 sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); 131 if (sig < 0) 132 goto badframe; 133 else if (sig) 134 force_sig(sig, current); 135 136 /* The ucontext contains a stack32_t, so we must convert! */ 137 if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) 138 goto badframe; 139 st.ss_sp = (void __user *)(long) sp; 140 if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) 141 goto badframe; 142 if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) 143 goto badframe; 144 145 /* It is more difficult to avoid calling this function than to 146 call it and ignore errors. */ 147 old_fs = get_fs(); 148 set_fs(KERNEL_DS); 149 do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); 150 set_fs(old_fs); 151 152 153 /* 154 * Don't let your children do this ... 155 */ 156 __asm__ __volatile__( 157 "move\t$29, %0\n\t" 158 "j\tsyscall_exit" 159 :/* no outputs */ 160 :"r" (®s)); 161 /* Unreached */ 162 163 badframe: 164 force_sig(SIGSEGV, current); 165 } 166 167 static int setup_rt_frame_n32(void *sig_return, struct k_sigaction *ka, 168 struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info) 169 { 170 struct rt_sigframe_n32 __user *frame; 171 int err = 0; 172 s32 sp; 173 174 frame = get_sigframe(ka, regs, sizeof(*frame)); 175 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) 176 goto give_sigsegv; 177 178 /* Create siginfo. */ 179 err |= copy_siginfo_to_user32(&frame->rs_info, info); 180 181 /* Create the ucontext. */ 182 err |= __put_user(0, &frame->rs_uc.uc_flags); 183 err |= __put_user(0, &frame->rs_uc.uc_link); 184 sp = (int) (long) current->sas_ss_sp; 185 err |= __put_user(sp, 186 &frame->rs_uc.uc_stack.ss_sp); 187 err |= __put_user(sas_ss_flags(regs->regs[29]), 188 &frame->rs_uc.uc_stack.ss_flags); 189 err |= __put_user(current->sas_ss_size, 190 &frame->rs_uc.uc_stack.ss_size); 191 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); 192 err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set); 193 194 if (err) 195 goto give_sigsegv; 196 197 /* 198 * Arguments to signal handler: 199 * 200 * a0 = signal number 201 * a1 = 0 (should be cause) 202 * a2 = pointer to ucontext 203 * 204 * $25 and c0_epc point to the signal handler, $29 points to 205 * the struct rt_sigframe. 206 */ 207 regs->regs[ 4] = signr; 208 regs->regs[ 5] = (unsigned long) &frame->rs_info; 209 regs->regs[ 6] = (unsigned long) &frame->rs_uc; 210 regs->regs[29] = (unsigned long) frame; 211 regs->regs[31] = (unsigned long) sig_return; 212 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; 213 214 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", 215 current->comm, current->pid, 216 frame, regs->cp0_epc, regs->regs[31]); 217 218 return 0; 219 220 give_sigsegv: 221 force_sigsegv(signr, current); 222 return -EFAULT; 223 } 224 225 struct mips_abi mips_abi_n32 = { 226 .setup_rt_frame = setup_rt_frame_n32, 227 .rt_signal_return_offset = 228 offsetof(struct mips_vdso, n32_rt_signal_trampoline), 229 .restart = __NR_N32_restart_syscall 230 }; 231