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 _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) 52 53 /* IRIX compatible stack_t */ 54 typedef struct sigaltstack32 { 55 s32 ss_sp; 56 compat_size_t ss_size; 57 int ss_flags; 58 } stack32_t; 59 60 struct ucontextn32 { 61 u32 uc_flags; 62 s32 uc_link; 63 stack32_t uc_stack; 64 struct sigcontext uc_mcontext; 65 sigset_t uc_sigmask; /* mask last for extensibility */ 66 }; 67 68 struct rt_sigframe_n32 { 69 u32 rs_ass[4]; /* argument save space for o32 */ 70 #if ICACHE_REFILLS_WORKAROUND_WAR 71 u32 rs_pad[2]; 72 #else 73 u32 rs_code[2]; /* signal trampoline */ 74 #endif 75 struct siginfo rs_info; 76 struct ucontextn32 rs_uc; 77 #if ICACHE_REFILLS_WORKAROUND_WAR 78 u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */ 79 #endif 80 }; 81 82 save_static_function(sysn32_rt_sigreturn); 83 __attribute_used__ noinline static void 84 _sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) 85 { 86 struct rt_sigframe_n32 *frame; 87 sigset_t set; 88 stack_t st; 89 s32 sp; 90 91 frame = (struct rt_sigframe_n32 *) regs.regs[29]; 92 if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 93 goto badframe; 94 if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) 95 goto badframe; 96 97 sigdelsetmask(&set, ~_BLOCKABLE); 98 spin_lock_irq(¤t->sighand->siglock); 99 current->blocked = set; 100 recalc_sigpending(); 101 spin_unlock_irq(¤t->sighand->siglock); 102 103 if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext)) 104 goto badframe; 105 106 /* The ucontext contains a stack32_t, so we must convert! */ 107 if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) 108 goto badframe; 109 st.ss_size = (long) sp; 110 if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) 111 goto badframe; 112 if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) 113 goto badframe; 114 115 /* It is more difficult to avoid calling this function than to 116 call it and ignore errors. */ 117 do_sigaltstack(&st, NULL, regs.regs[29]); 118 119 /* 120 * Don't let your children do this ... 121 */ 122 __asm__ __volatile__( 123 "move\t$29, %0\n\t" 124 "j\tsyscall_exit" 125 :/* no outputs */ 126 :"r" (®s)); 127 /* Unreached */ 128 129 badframe: 130 force_sig(SIGSEGV, current); 131 } 132 133 int setup_rt_frame_n32(struct k_sigaction * ka, 134 struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info) 135 { 136 struct rt_sigframe_n32 *frame; 137 int err = 0; 138 s32 sp; 139 140 frame = get_sigframe(ka, regs, sizeof(*frame)); 141 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) 142 goto give_sigsegv; 143 144 install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn); 145 146 /* Create siginfo. */ 147 err |= copy_siginfo_to_user(&frame->rs_info, info); 148 149 /* Create the ucontext. */ 150 err |= __put_user(0, &frame->rs_uc.uc_flags); 151 err |= __put_user(0, &frame->rs_uc.uc_link); 152 sp = (int) (long) current->sas_ss_sp; 153 err |= __put_user(sp, 154 &frame->rs_uc.uc_stack.ss_sp); 155 err |= __put_user(sas_ss_flags(regs->regs[29]), 156 &frame->rs_uc.uc_stack.ss_flags); 157 err |= __put_user(current->sas_ss_size, 158 &frame->rs_uc.uc_stack.ss_size); 159 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); 160 err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); 161 162 if (err) 163 goto give_sigsegv; 164 165 /* 166 * Arguments to signal handler: 167 * 168 * a0 = signal number 169 * a1 = 0 (should be cause) 170 * a2 = pointer to ucontext 171 * 172 * $25 and c0_epc point to the signal handler, $29 points to 173 * the struct rt_sigframe. 174 */ 175 regs->regs[ 4] = signr; 176 regs->regs[ 5] = (unsigned long) &frame->rs_info; 177 regs->regs[ 6] = (unsigned long) &frame->rs_uc; 178 regs->regs[29] = (unsigned long) frame; 179 regs->regs[31] = (unsigned long) frame->rs_code; 180 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; 181 182 #if DEBUG_SIG 183 printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n", 184 current->comm, current->pid, 185 frame, regs->cp0_epc, regs->regs[31]); 186 #endif 187 return 1; 188 189 give_sigsegv: 190 force_sigsegv(signr, current); 191 return 0; 192 } 193