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; 91 compat_sigset_t uset; 92 size_t sigsetsize; 93 sigset_t newset; 94 95 /* XXX Don't preclude handling different sized sigset_t's. */ 96 sigsetsize = regs.regs[5]; 97 if (sigsetsize != sizeof(sigset_t)) 98 return -EINVAL; 99 100 unewset = (compat_sigset_t __user *) regs.regs[4]; 101 if (copy_from_user(&uset, unewset, sizeof(uset))) 102 return -EFAULT; 103 sigset_from_compat (&newset, &uset); 104 sigdelsetmask(&newset, ~_BLOCKABLE); 105 106 spin_lock_irq(¤t->sighand->siglock); 107 current->saved_sigmask = current->blocked; 108 current->blocked = newset; 109 recalc_sigpending(); 110 spin_unlock_irq(¤t->sighand->siglock); 111 112 current->state = TASK_INTERRUPTIBLE; 113 schedule(); 114 set_thread_flag(TIF_RESTORE_SIGMASK); 115 return -ERESTARTNOHAND; 116 } 117 118 save_static_function(sysn32_rt_sigreturn); 119 __attribute_used__ noinline static void 120 _sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) 121 { 122 struct rt_sigframe_n32 __user *frame; 123 sigset_t set; 124 stack_t st; 125 s32 sp; 126 127 frame = (struct rt_sigframe_n32 __user *) regs.regs[29]; 128 if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 129 goto badframe; 130 if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) 131 goto badframe; 132 133 sigdelsetmask(&set, ~_BLOCKABLE); 134 spin_lock_irq(¤t->sighand->siglock); 135 current->blocked = set; 136 recalc_sigpending(); 137 spin_unlock_irq(¤t->sighand->siglock); 138 139 if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext)) 140 goto badframe; 141 142 /* The ucontext contains a stack32_t, so we must convert! */ 143 if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) 144 goto badframe; 145 st.ss_sp = (void __user *)(long) sp; 146 if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) 147 goto badframe; 148 if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) 149 goto badframe; 150 151 /* It is more difficult to avoid calling this function than to 152 call it and ignore errors. */ 153 do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); 154 155 /* 156 * Don't let your children do this ... 157 */ 158 __asm__ __volatile__( 159 "move\t$29, %0\n\t" 160 "j\tsyscall_exit" 161 :/* no outputs */ 162 :"r" (®s)); 163 /* Unreached */ 164 165 badframe: 166 force_sig(SIGSEGV, current); 167 } 168 169 int setup_rt_frame_n32(struct k_sigaction * ka, 170 struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info) 171 { 172 struct rt_sigframe_n32 __user *frame; 173 int err = 0; 174 s32 sp; 175 176 frame = get_sigframe(ka, regs, sizeof(*frame)); 177 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) 178 goto give_sigsegv; 179 180 install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn); 181 182 /* Create siginfo. */ 183 err |= copy_siginfo_to_user(&frame->rs_info, info); 184 185 /* Create the ucontext. */ 186 err |= __put_user(0, &frame->rs_uc.uc_flags); 187 err |= __put_user(0, &frame->rs_uc.uc_link); 188 sp = (int) (long) current->sas_ss_sp; 189 err |= __put_user(sp, 190 &frame->rs_uc.uc_stack.ss_sp); 191 err |= __put_user(sas_ss_flags(regs->regs[29]), 192 &frame->rs_uc.uc_stack.ss_flags); 193 err |= __put_user(current->sas_ss_size, 194 &frame->rs_uc.uc_stack.ss_size); 195 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); 196 err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); 197 198 if (err) 199 goto give_sigsegv; 200 201 /* 202 * Arguments to signal handler: 203 * 204 * a0 = signal number 205 * a1 = 0 (should be cause) 206 * a2 = pointer to ucontext 207 * 208 * $25 and c0_epc point to the signal handler, $29 points to 209 * the struct rt_sigframe. 210 */ 211 regs->regs[ 4] = signr; 212 regs->regs[ 5] = (unsigned long) &frame->rs_info; 213 regs->regs[ 6] = (unsigned long) &frame->rs_uc; 214 regs->regs[29] = (unsigned long) frame; 215 regs->regs[31] = (unsigned long) frame->rs_code; 216 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; 217 218 #if DEBUG_SIG 219 printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n", 220 current->comm, current->pid, 221 frame, regs->cp0_epc, regs->regs[31]); 222 #endif 223 return 0; 224 225 give_sigsegv: 226 force_sigsegv(signr, current); 227 return -EFAULT; 228 } 229