signal.c (7575B)
1 /* 2 * Emulation of Linux signals 3 * 4 * Copyright (c) 2003 Fabrice Bellard 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 #include "qemu/osdep.h" 20 #include "qemu.h" 21 #include "user-internals.h" 22 #include "signal-common.h" 23 #include "linux-user/trace.h" 24 25 struct target_sigcontext { 26 abi_long sc_onstack; 27 abi_long sc_mask; 28 abi_long sc_pc; 29 abi_long sc_ps; 30 abi_long sc_regs[32]; 31 abi_long sc_ownedfp; 32 abi_long sc_fpregs[32]; 33 abi_ulong sc_fpcr; 34 abi_ulong sc_fp_control; 35 abi_ulong sc_reserved1; 36 abi_ulong sc_reserved2; 37 abi_ulong sc_ssize; 38 abi_ulong sc_sbase; 39 abi_ulong sc_traparg_a0; 40 abi_ulong sc_traparg_a1; 41 abi_ulong sc_traparg_a2; 42 abi_ulong sc_fp_trap_pc; 43 abi_ulong sc_fp_trigger_sum; 44 abi_ulong sc_fp_trigger_inst; 45 }; 46 47 struct target_ucontext { 48 abi_ulong tuc_flags; 49 abi_ulong tuc_link; 50 abi_ulong tuc_osf_sigmask; 51 target_stack_t tuc_stack; 52 struct target_sigcontext tuc_mcontext; 53 target_sigset_t tuc_sigmask; 54 }; 55 56 struct target_sigframe { 57 struct target_sigcontext sc; 58 }; 59 60 struct target_rt_sigframe { 61 target_siginfo_t info; 62 struct target_ucontext uc; 63 }; 64 65 #define INSN_MOV_R30_R16 0x47fe0410 66 #define INSN_LDI_R0 0x201f0000 67 #define INSN_CALLSYS 0x00000083 68 69 static void setup_sigcontext(struct target_sigcontext *sc, CPUAlphaState *env, 70 abi_ulong frame_addr, target_sigset_t *set) 71 { 72 int i; 73 74 __put_user(on_sig_stack(frame_addr), &sc->sc_onstack); 75 __put_user(set->sig[0], &sc->sc_mask); 76 __put_user(env->pc, &sc->sc_pc); 77 __put_user(8, &sc->sc_ps); 78 79 for (i = 0; i < 31; ++i) { 80 __put_user(env->ir[i], &sc->sc_regs[i]); 81 } 82 __put_user(0, &sc->sc_regs[31]); 83 84 for (i = 0; i < 31; ++i) { 85 __put_user(env->fir[i], &sc->sc_fpregs[i]); 86 } 87 __put_user(0, &sc->sc_fpregs[31]); 88 __put_user(cpu_alpha_load_fpcr(env), &sc->sc_fpcr); 89 90 __put_user(0, &sc->sc_traparg_a0); /* FIXME */ 91 __put_user(0, &sc->sc_traparg_a1); /* FIXME */ 92 __put_user(0, &sc->sc_traparg_a2); /* FIXME */ 93 } 94 95 static void restore_sigcontext(CPUAlphaState *env, 96 struct target_sigcontext *sc) 97 { 98 uint64_t fpcr; 99 int i; 100 101 __get_user(env->pc, &sc->sc_pc); 102 103 for (i = 0; i < 31; ++i) { 104 __get_user(env->ir[i], &sc->sc_regs[i]); 105 } 106 for (i = 0; i < 31; ++i) { 107 __get_user(env->fir[i], &sc->sc_fpregs[i]); 108 } 109 110 __get_user(fpcr, &sc->sc_fpcr); 111 cpu_alpha_store_fpcr(env, fpcr); 112 } 113 114 static inline abi_ulong get_sigframe(struct target_sigaction *sa, 115 CPUAlphaState *env, 116 unsigned long framesize) 117 { 118 abi_ulong sp; 119 120 sp = target_sigsp(get_sp_from_cpustate(env), sa); 121 122 return (sp - framesize) & -32; 123 } 124 125 void setup_frame(int sig, struct target_sigaction *ka, 126 target_sigset_t *set, CPUAlphaState *env) 127 { 128 abi_ulong frame_addr, r26; 129 struct target_sigframe *frame; 130 int err = 0; 131 132 frame_addr = get_sigframe(ka, env, sizeof(*frame)); 133 trace_user_setup_frame(env, frame_addr); 134 if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { 135 goto give_sigsegv; 136 } 137 138 setup_sigcontext(&frame->sc, env, frame_addr, set); 139 140 if (ka->ka_restorer) { 141 r26 = ka->ka_restorer; 142 } else { 143 r26 = default_sigreturn; 144 } 145 146 unlock_user_struct(frame, frame_addr, 1); 147 148 if (err) { 149 give_sigsegv: 150 force_sigsegv(sig); 151 return; 152 } 153 154 env->ir[IR_RA] = r26; 155 env->ir[IR_PV] = env->pc = ka->_sa_handler; 156 env->ir[IR_A0] = sig; 157 env->ir[IR_A1] = 0; 158 env->ir[IR_A2] = frame_addr + offsetof(struct target_sigframe, sc); 159 env->ir[IR_SP] = frame_addr; 160 } 161 162 void setup_rt_frame(int sig, struct target_sigaction *ka, 163 target_siginfo_t *info, 164 target_sigset_t *set, CPUAlphaState *env) 165 { 166 abi_ulong frame_addr, r26; 167 struct target_rt_sigframe *frame; 168 int i, err = 0; 169 170 frame_addr = get_sigframe(ka, env, sizeof(*frame)); 171 trace_user_setup_rt_frame(env, frame_addr); 172 if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { 173 goto give_sigsegv; 174 } 175 176 tswap_siginfo(&frame->info, info); 177 178 __put_user(0, &frame->uc.tuc_flags); 179 __put_user(0, &frame->uc.tuc_link); 180 __put_user(set->sig[0], &frame->uc.tuc_osf_sigmask); 181 182 target_save_altstack(&frame->uc.tuc_stack, env); 183 184 setup_sigcontext(&frame->uc.tuc_mcontext, env, frame_addr, set); 185 for (i = 0; i < TARGET_NSIG_WORDS; ++i) { 186 __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]); 187 } 188 189 if (ka->ka_restorer) { 190 r26 = ka->ka_restorer; 191 } else { 192 r26 = default_rt_sigreturn; 193 } 194 195 if (err) { 196 give_sigsegv: 197 force_sigsegv(sig); 198 return; 199 } 200 201 env->ir[IR_RA] = r26; 202 env->ir[IR_PV] = env->pc = ka->_sa_handler; 203 env->ir[IR_A0] = sig; 204 env->ir[IR_A1] = frame_addr + offsetof(struct target_rt_sigframe, info); 205 env->ir[IR_A2] = frame_addr + offsetof(struct target_rt_sigframe, uc); 206 env->ir[IR_SP] = frame_addr; 207 } 208 209 long do_sigreturn(CPUAlphaState *env) 210 { 211 struct target_sigcontext *sc; 212 abi_ulong sc_addr = env->ir[IR_A0]; 213 target_sigset_t target_set; 214 sigset_t set; 215 216 if (!lock_user_struct(VERIFY_READ, sc, sc_addr, 1)) { 217 goto badframe; 218 } 219 220 target_sigemptyset(&target_set); 221 __get_user(target_set.sig[0], &sc->sc_mask); 222 223 target_to_host_sigset_internal(&set, &target_set); 224 set_sigmask(&set); 225 226 restore_sigcontext(env, sc); 227 unlock_user_struct(sc, sc_addr, 0); 228 return -QEMU_ESIGRETURN; 229 230 badframe: 231 force_sig(TARGET_SIGSEGV); 232 return -QEMU_ESIGRETURN; 233 } 234 235 long do_rt_sigreturn(CPUAlphaState *env) 236 { 237 abi_ulong frame_addr = env->ir[IR_A0]; 238 struct target_rt_sigframe *frame; 239 sigset_t set; 240 241 trace_user_do_rt_sigreturn(env, frame_addr); 242 if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { 243 goto badframe; 244 } 245 target_to_host_sigset(&set, &frame->uc.tuc_sigmask); 246 set_sigmask(&set); 247 248 restore_sigcontext(env, &frame->uc.tuc_mcontext); 249 target_restore_altstack(&frame->uc.tuc_stack, env); 250 251 unlock_user_struct(frame, frame_addr, 0); 252 return -QEMU_ESIGRETURN; 253 254 255 badframe: 256 unlock_user_struct(frame, frame_addr, 0); 257 force_sig(TARGET_SIGSEGV); 258 return -QEMU_ESIGRETURN; 259 } 260 261 void setup_sigtramp(abi_ulong sigtramp_page) 262 { 263 uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 6 * 4, 0); 264 assert(tramp != NULL); 265 266 default_sigreturn = sigtramp_page; 267 __put_user(INSN_MOV_R30_R16, &tramp[0]); 268 __put_user(INSN_LDI_R0 + TARGET_NR_sigreturn, &tramp[1]); 269 __put_user(INSN_CALLSYS, &tramp[2]); 270 271 default_rt_sigreturn = sigtramp_page + 3 * 4; 272 __put_user(INSN_MOV_R30_R16, &tramp[3]); 273 __put_user(INSN_LDI_R0 + TARGET_NR_rt_sigreturn, &tramp[4]); 274 __put_user(INSN_CALLSYS, &tramp[5]); 275 276 unlock_user(tramp, sigtramp_page, 6 * 4); 277 }