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/sched.h> 21 #include <linux/mm.h> 22 #include <linux/smp.h> 23 #include <linux/smp_lock.h> 24 #include <linux/kernel.h> 25 #include <linux/signal.h> 26 #include <linux/errno.h> 27 #include <linux/wait.h> 28 #include <linux/ptrace.h> 29 #include <linux/unistd.h> 30 #include <linux/compat.h> 31 #include <linux/bitops.h> 32 33 #include <asm/asm.h> 34 #include <asm/cacheflush.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 #define DEBUG_SIG 0 52 53 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) 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 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 #if ICACHE_REFILLS_WORKAROUND_WAR 73 u32 rs_pad[2]; 74 #else 75 u32 rs_code[2]; /* signal trampoline */ 76 #endif 77 struct siginfo rs_info; 78 struct ucontextn32 rs_uc; 79 #if ICACHE_REFILLS_WORKAROUND_WAR 80 u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */ 81 #endif 82 }; 83 84 extern void sigset_from_compat (sigset_t *set, compat_sigset_t *compat); 85 86 save_static_function(sysn32_rt_sigsuspend); 87 __attribute_used__ noinline static int 88 _sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) 89 { 90 compat_sigset_t __user *unewset, uset; 91 size_t sigsetsize; 92 sigset_t newset; 93 94 /* XXX Don't preclude handling different sized sigset_t's. */ 95 sigsetsize = regs.regs[5]; 96 if (sigsetsize != sizeof(sigset_t)) 97 return -EINVAL; 98 99 unewset = (compat_sigset_t __user *) regs.regs[4]; 100 if (copy_from_user(&uset, unewset, sizeof(uset))) 101 return -EFAULT; 102 sigset_from_compat (&newset, &uset); 103 sigdelsetmask(&newset, ~_BLOCKABLE); 104 105 spin_lock_irq(¤t->sighand->siglock); 106 current->saved_sigmask = current->blocked; 107 current->blocked = newset; 108 recalc_sigpending(); 109 spin_unlock_irq(¤t->sighand->siglock); 110 111 current->state = TASK_INTERRUPTIBLE; 112 schedule(); 113 set_thread_flag(TIF_RESTORE_SIGMASK); 114 return -ERESTARTNOHAND; 115 } 116 117 save_static_function(sysn32_rt_sigreturn); 118 __attribute_used__ noinline static void 119 _sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) 120 { 121 struct rt_sigframe_n32 __user *frame; 122 sigset_t set; 123 stack_t st; 124 s32 sp; 125 126 frame = (struct rt_sigframe_n32 __user *) regs.regs[29]; 127 if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 128 goto badframe; 129 if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) 130 goto badframe; 131 132 sigdelsetmask(&set, ~_BLOCKABLE); 133 spin_lock_irq(¤t->sighand->siglock); 134 current->blocked = set; 135 recalc_sigpending(); 136 spin_unlock_irq(¤t->sighand->siglock); 137 138 if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext)) 139 goto badframe; 140 141 /* The ucontext contains a stack32_t, so we must convert! */ 142 if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) 143 goto badframe; 144 st.ss_sp = (void *)(long) sp; 145 if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) 146 goto badframe; 147 if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) 148 goto badframe; 149 150 /* It is more difficult to avoid calling this function than to 151 call it and ignore errors. */ 152 do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); 153 154 /* 155 * Don't let your children do this ... 156 */ 157 __asm__ __volatile__( 158 "move\t$29, %0\n\t" 159 "j\tsyscall_exit" 160 :/* no outputs */ 161 :"r" (®s)); 162 /* Unreached */ 163 164 badframe: 165 force_sig(SIGSEGV, current); 166 } 167 168 int setup_rt_frame_n32(struct k_sigaction * ka, 169 struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info) 170 { 171 struct rt_sigframe_n32 __user *frame; 172 int err = 0; 173 s32 sp; 174 175 frame = get_sigframe(ka, regs, sizeof(*frame)); 176 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) 177 goto give_sigsegv; 178 179 install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn); 180 181 /* Create siginfo. */ 182 err |= copy_siginfo_to_user(&frame->rs_info, info); 183 184 /* Create the ucontext. */ 185 err |= __put_user(0, &frame->rs_uc.uc_flags); 186 err |= __put_user(0, &frame->rs_uc.uc_link); 187 sp = (int) (long) current->sas_ss_sp; 188 err |= __put_user(sp, 189 &frame->rs_uc.uc_stack.ss_sp); 190 err |= __put_user(sas_ss_flags(regs->regs[29]), 191 &frame->rs_uc.uc_stack.ss_flags); 192 err |= __put_user(current->sas_ss_size, 193 &frame->rs_uc.uc_stack.ss_size); 194 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); 195 err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); 196 197 if (err) 198 goto give_sigsegv; 199 200 /* 201 * Arguments to signal handler: 202 * 203 * a0 = signal number 204 * a1 = 0 (should be cause) 205 * a2 = pointer to ucontext 206 * 207 * $25 and c0_epc point to the signal handler, $29 points to 208 * the struct rt_sigframe. 209 */ 210 regs->regs[ 4] = signr; 211 regs->regs[ 5] = (unsigned long) &frame->rs_info; 212 regs->regs[ 6] = (unsigned long) &frame->rs_uc; 213 regs->regs[29] = (unsigned long) frame; 214 regs->regs[31] = (unsigned long) frame->rs_code; 215 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; 216 217 #if DEBUG_SIG 218 printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n", 219 current->comm, current->pid, 220 frame, regs->cp0_epc, regs->regs[31]); 221 #endif 222 return 0; 223 224 give_sigsegv: 225 force_sigsegv(signr, current); 226 return -EFAULT; 227 } 228