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 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_rt_sigreturn 6211 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 #if ICACHE_REFILLS_WORKAROUND_WAR == 0 71 72 struct rt_sigframe_n32 { 73 u32 rs_ass[4]; /* argument save space for o32 */ 74 u32 rs_code[2]; /* signal trampoline */ 75 struct compat_siginfo rs_info; 76 struct ucontextn32 rs_uc; 77 }; 78 79 #else /* ICACHE_REFILLS_WORKAROUND_WAR */ 80 81 struct rt_sigframe_n32 { 82 u32 rs_ass[4]; /* argument save space for o32 */ 83 u32 rs_pad[2]; 84 struct compat_siginfo rs_info; 85 struct ucontextn32 rs_uc; 86 u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */ 87 }; 88 89 #endif /* !ICACHE_REFILLS_WORKAROUND_WAR */ 90 91 extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat); 92 93 asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) 94 { 95 compat_sigset_t __user *unewset; 96 compat_sigset_t uset; 97 size_t sigsetsize; 98 sigset_t newset; 99 100 /* XXX Don't preclude handling different sized sigset_t's. */ 101 sigsetsize = regs.regs[5]; 102 if (sigsetsize != sizeof(sigset_t)) 103 return -EINVAL; 104 105 unewset = (compat_sigset_t __user *) regs.regs[4]; 106 if (copy_from_user(&uset, unewset, sizeof(uset))) 107 return -EFAULT; 108 sigset_from_compat(&newset, &uset); 109 sigdelsetmask(&newset, ~_BLOCKABLE); 110 111 spin_lock_irq(¤t->sighand->siglock); 112 current->saved_sigmask = current->blocked; 113 current->blocked = newset; 114 recalc_sigpending(); 115 spin_unlock_irq(¤t->sighand->siglock); 116 117 current->state = TASK_INTERRUPTIBLE; 118 schedule(); 119 set_thread_flag(TIF_RESTORE_SIGMASK); 120 return -ERESTARTNOHAND; 121 } 122 123 asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) 124 { 125 struct rt_sigframe_n32 __user *frame; 126 sigset_t set; 127 stack_t st; 128 s32 sp; 129 int sig; 130 131 frame = (struct rt_sigframe_n32 __user *) regs.regs[29]; 132 if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 133 goto badframe; 134 if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask)) 135 goto badframe; 136 137 sigdelsetmask(&set, ~_BLOCKABLE); 138 spin_lock_irq(¤t->sighand->siglock); 139 current->blocked = set; 140 recalc_sigpending(); 141 spin_unlock_irq(¤t->sighand->siglock); 142 143 sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); 144 if (sig < 0) 145 goto badframe; 146 else if (sig) 147 force_sig(sig, current); 148 149 /* The ucontext contains a stack32_t, so we must convert! */ 150 if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) 151 goto badframe; 152 st.ss_sp = (void __user *)(long) sp; 153 if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) 154 goto badframe; 155 if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) 156 goto badframe; 157 158 /* It is more difficult to avoid calling this function than to 159 call it and ignore errors. */ 160 do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); 161 162 /* 163 * Don't let your children do this ... 164 */ 165 __asm__ __volatile__( 166 "move\t$29, %0\n\t" 167 "j\tsyscall_exit" 168 :/* no outputs */ 169 :"r" (®s)); 170 /* Unreached */ 171 172 badframe: 173 force_sig(SIGSEGV, current); 174 } 175 176 static int setup_rt_frame_n32(struct k_sigaction * ka, 177 struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info) 178 { 179 struct rt_sigframe_n32 __user *frame; 180 int err = 0; 181 s32 sp; 182 183 frame = get_sigframe(ka, regs, sizeof(*frame)); 184 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) 185 goto give_sigsegv; 186 187 install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn); 188 189 /* Create siginfo. */ 190 err |= copy_siginfo_to_user32(&frame->rs_info, info); 191 192 /* Create the ucontext. */ 193 err |= __put_user(0, &frame->rs_uc.uc_flags); 194 err |= __put_user(0, &frame->rs_uc.uc_link); 195 sp = (int) (long) current->sas_ss_sp; 196 err |= __put_user(sp, 197 &frame->rs_uc.uc_stack.ss_sp); 198 err |= __put_user(sas_ss_flags(regs->regs[29]), 199 &frame->rs_uc.uc_stack.ss_flags); 200 err |= __put_user(current->sas_ss_size, 201 &frame->rs_uc.uc_stack.ss_size); 202 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); 203 err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set); 204 205 if (err) 206 goto give_sigsegv; 207 208 /* 209 * Arguments to signal handler: 210 * 211 * a0 = signal number 212 * a1 = 0 (should be cause) 213 * a2 = pointer to ucontext 214 * 215 * $25 and c0_epc point to the signal handler, $29 points to 216 * the struct rt_sigframe. 217 */ 218 regs->regs[ 4] = signr; 219 regs->regs[ 5] = (unsigned long) &frame->rs_info; 220 regs->regs[ 6] = (unsigned long) &frame->rs_uc; 221 regs->regs[29] = (unsigned long) frame; 222 regs->regs[31] = (unsigned long) frame->rs_code; 223 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; 224 225 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", 226 current->comm, current->pid, 227 frame, regs->cp0_epc, regs->regs[31]); 228 229 return 0; 230 231 give_sigsegv: 232 force_sigsegv(signr, current); 233 return -EFAULT; 234 } 235 236 struct mips_abi mips_abi_n32 = { 237 .setup_rt_frame = setup_rt_frame_n32, 238 .restart = __NR_N32_restart_syscall 239 }; 240