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/smp_lock.h> 23 #include <linux/kernel.h> 24 #include <linux/signal.h> 25 #include <linux/errno.h> 26 #include <linux/wait.h> 27 #include <linux/ptrace.h> 28 #include <linux/unistd.h> 29 #include <linux/compat.h> 30 #include <linux/bitops.h> 31 32 #include <asm/abi.h> 33 #include <asm/asm.h> 34 #include <asm/cacheflush.h> 35 #include <asm/compat-signal.h> 36 #include <asm/sim.h> 37 #include <asm/uaccess.h> 38 #include <asm/ucontext.h> 39 #include <asm/system.h> 40 #include <asm/fpu.h> 41 #include <asm/cpu-features.h> 42 #include <asm/war.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_rt_sigreturn 6211 50 #define __NR_N32_restart_syscall 6214 51 52 extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *); 53 extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *); 54 55 56 /* IRIX compatible stack_t */ 57 typedef struct sigaltstack32 { 58 s32 ss_sp; 59 compat_size_t ss_size; 60 int ss_flags; 61 } stack32_t; 62 63 struct ucontextn32 { 64 u32 uc_flags; 65 s32 uc_link; 66 stack32_t uc_stack; 67 struct sigcontext uc_mcontext; 68 compat_sigset_t uc_sigmask; /* mask last for extensibility */ 69 }; 70 71 #if ICACHE_REFILLS_WORKAROUND_WAR == 0 72 73 struct rt_sigframe_n32 { 74 u32 rs_ass[4]; /* argument save space for o32 */ 75 u32 rs_code[2]; /* signal trampoline */ 76 struct siginfo rs_info; 77 struct ucontextn32 rs_uc; 78 }; 79 80 #else /* ICACHE_REFILLS_WORKAROUND_WAR */ 81 82 struct rt_sigframe_n32 { 83 u32 rs_ass[4]; /* argument save space for o32 */ 84 u32 rs_pad[2]; 85 struct siginfo rs_info; 86 struct ucontextn32 rs_uc; 87 u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */ 88 }; 89 90 #endif /* !ICACHE_REFILLS_WORKAROUND_WAR */ 91 92 extern void sigset_from_compat (sigset_t *set, compat_sigset_t *compat); 93 94 asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) 95 { 96 compat_sigset_t __user *unewset; 97 compat_sigset_t uset; 98 size_t sigsetsize; 99 sigset_t newset; 100 101 /* XXX Don't preclude handling different sized sigset_t's. */ 102 sigsetsize = regs.regs[5]; 103 if (sigsetsize != sizeof(sigset_t)) 104 return -EINVAL; 105 106 unewset = (compat_sigset_t __user *) regs.regs[4]; 107 if (copy_from_user(&uset, unewset, sizeof(uset))) 108 return -EFAULT; 109 sigset_from_compat (&newset, &uset); 110 sigdelsetmask(&newset, ~_BLOCKABLE); 111 112 spin_lock_irq(¤t->sighand->siglock); 113 current->saved_sigmask = current->blocked; 114 current->blocked = newset; 115 recalc_sigpending(); 116 spin_unlock_irq(¤t->sighand->siglock); 117 118 current->state = TASK_INTERRUPTIBLE; 119 schedule(); 120 set_thread_flag(TIF_RESTORE_SIGMASK); 121 return -ERESTARTNOHAND; 122 } 123 124 asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) 125 { 126 struct rt_sigframe_n32 __user *frame; 127 sigset_t set; 128 stack_t st; 129 s32 sp; 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 if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext)) 144 goto badframe; 145 146 /* The ucontext contains a stack32_t, so we must convert! */ 147 if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) 148 goto badframe; 149 st.ss_sp = (void __user *)(long) sp; 150 if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) 151 goto badframe; 152 if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) 153 goto badframe; 154 155 /* It is more difficult to avoid calling this function than to 156 call it and ignore errors. */ 157 do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); 158 159 /* 160 * Don't let your children do this ... 161 */ 162 __asm__ __volatile__( 163 "move\t$29, %0\n\t" 164 "j\tsyscall_exit" 165 :/* no outputs */ 166 :"r" (®s)); 167 /* Unreached */ 168 169 badframe: 170 force_sig(SIGSEGV, current); 171 } 172 173 static int setup_rt_frame_n32(struct k_sigaction * ka, 174 struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info) 175 { 176 struct rt_sigframe_n32 __user *frame; 177 int err = 0; 178 s32 sp; 179 180 frame = get_sigframe(ka, regs, sizeof(*frame)); 181 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) 182 goto give_sigsegv; 183 184 install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn); 185 186 /* Create siginfo. */ 187 err |= copy_siginfo_to_user(&frame->rs_info, info); 188 189 /* Create the ucontext. */ 190 err |= __put_user(0, &frame->rs_uc.uc_flags); 191 err |= __put_user(0, &frame->rs_uc.uc_link); 192 sp = (int) (long) current->sas_ss_sp; 193 err |= __put_user(sp, 194 &frame->rs_uc.uc_stack.ss_sp); 195 err |= __put_user(sas_ss_flags(regs->regs[29]), 196 &frame->rs_uc.uc_stack.ss_flags); 197 err |= __put_user(current->sas_ss_size, 198 &frame->rs_uc.uc_stack.ss_size); 199 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); 200 err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set); 201 202 if (err) 203 goto give_sigsegv; 204 205 /* 206 * Arguments to signal handler: 207 * 208 * a0 = signal number 209 * a1 = 0 (should be cause) 210 * a2 = pointer to ucontext 211 * 212 * $25 and c0_epc point to the signal handler, $29 points to 213 * the struct rt_sigframe. 214 */ 215 regs->regs[ 4] = signr; 216 regs->regs[ 5] = (unsigned long) &frame->rs_info; 217 regs->regs[ 6] = (unsigned long) &frame->rs_uc; 218 regs->regs[29] = (unsigned long) frame; 219 regs->regs[31] = (unsigned long) frame->rs_code; 220 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; 221 222 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", 223 current->comm, current->pid, 224 frame, regs->cp0_epc, regs->regs[31]); 225 226 return 0; 227 228 give_sigsegv: 229 force_sigsegv(signr, current); 230 return -EFAULT; 231 } 232 233 struct mips_abi mips_abi_n32 = { 234 .setup_rt_frame = setup_rt_frame_n32, 235 .restart = __NR_N32_restart_syscall 236 }; 237