1 /* 2 * Emulation of Linux signals 3 * 4 * Copyright (c) 2003 Fabrice Bellard 5 * Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 #include "qemu/osdep.h" 21 #include "qemu.h" 22 #include "signal-common.h" 23 #include "linux-user/trace.h" 24 25 struct target_sigcontext { 26 target_ulong r0, r1, r2, r3; 27 target_ulong r4, r5, r6, r7; 28 target_ulong r8, r9, r10, r11; 29 target_ulong r12, r13, r14, r15; 30 target_ulong r16, r17, r18, r19; 31 target_ulong r20, r21, r22, r23; 32 target_ulong r24, r25, r26, r27; 33 target_ulong r28, r29, r30, r31; 34 target_ulong sa0; 35 target_ulong lc0; 36 target_ulong sa1; 37 target_ulong lc1; 38 target_ulong m0; 39 target_ulong m1; 40 target_ulong usr; 41 target_ulong p3_0; 42 target_ulong gp; 43 target_ulong ugp; 44 target_ulong pc; 45 target_ulong cause; 46 target_ulong badva; 47 target_ulong pad1; 48 target_ulong pad2; 49 target_ulong pad3; 50 }; 51 52 struct target_ucontext { 53 unsigned long uc_flags; 54 target_ulong uc_link; /* target pointer */ 55 target_stack_t uc_stack; 56 struct target_sigcontext uc_mcontext; 57 target_sigset_t uc_sigmask; 58 }; 59 60 struct target_rt_sigframe { 61 uint32_t tramp[2]; 62 struct target_siginfo info; 63 struct target_ucontext uc; 64 }; 65 66 static abi_ulong get_sigframe(struct target_sigaction *ka, 67 CPUHexagonState *regs, size_t framesize) 68 { 69 abi_ulong sp = get_sp_from_cpustate(regs); 70 71 /* This is the X/Open sanctioned signal stack switching. */ 72 sp = target_sigsp(sp, ka) - framesize; 73 74 sp = QEMU_ALIGN_DOWN(sp, 8); 75 76 return sp; 77 } 78 79 static void setup_sigcontext(struct target_sigcontext *sc, CPUHexagonState *env) 80 { 81 __put_user(env->gpr[HEX_REG_R00], &sc->r0); 82 __put_user(env->gpr[HEX_REG_R01], &sc->r1); 83 __put_user(env->gpr[HEX_REG_R02], &sc->r2); 84 __put_user(env->gpr[HEX_REG_R03], &sc->r3); 85 __put_user(env->gpr[HEX_REG_R04], &sc->r4); 86 __put_user(env->gpr[HEX_REG_R05], &sc->r5); 87 __put_user(env->gpr[HEX_REG_R06], &sc->r6); 88 __put_user(env->gpr[HEX_REG_R07], &sc->r7); 89 __put_user(env->gpr[HEX_REG_R08], &sc->r8); 90 __put_user(env->gpr[HEX_REG_R09], &sc->r9); 91 __put_user(env->gpr[HEX_REG_R10], &sc->r10); 92 __put_user(env->gpr[HEX_REG_R11], &sc->r11); 93 __put_user(env->gpr[HEX_REG_R12], &sc->r12); 94 __put_user(env->gpr[HEX_REG_R13], &sc->r13); 95 __put_user(env->gpr[HEX_REG_R14], &sc->r14); 96 __put_user(env->gpr[HEX_REG_R15], &sc->r15); 97 __put_user(env->gpr[HEX_REG_R16], &sc->r16); 98 __put_user(env->gpr[HEX_REG_R17], &sc->r17); 99 __put_user(env->gpr[HEX_REG_R18], &sc->r18); 100 __put_user(env->gpr[HEX_REG_R19], &sc->r19); 101 __put_user(env->gpr[HEX_REG_R20], &sc->r20); 102 __put_user(env->gpr[HEX_REG_R21], &sc->r21); 103 __put_user(env->gpr[HEX_REG_R22], &sc->r22); 104 __put_user(env->gpr[HEX_REG_R23], &sc->r23); 105 __put_user(env->gpr[HEX_REG_R24], &sc->r24); 106 __put_user(env->gpr[HEX_REG_R25], &sc->r25); 107 __put_user(env->gpr[HEX_REG_R26], &sc->r26); 108 __put_user(env->gpr[HEX_REG_R27], &sc->r27); 109 __put_user(env->gpr[HEX_REG_R28], &sc->r28); 110 __put_user(env->gpr[HEX_REG_R29], &sc->r29); 111 __put_user(env->gpr[HEX_REG_R30], &sc->r30); 112 __put_user(env->gpr[HEX_REG_R31], &sc->r31); 113 __put_user(env->gpr[HEX_REG_SA0], &sc->sa0); 114 __put_user(env->gpr[HEX_REG_LC0], &sc->lc0); 115 __put_user(env->gpr[HEX_REG_SA1], &sc->sa1); 116 __put_user(env->gpr[HEX_REG_LC1], &sc->lc1); 117 __put_user(env->gpr[HEX_REG_M0], &sc->m0); 118 __put_user(env->gpr[HEX_REG_M1], &sc->m1); 119 __put_user(env->gpr[HEX_REG_USR], &sc->usr); 120 __put_user(env->gpr[HEX_REG_P3_0], &sc->p3_0); 121 __put_user(env->gpr[HEX_REG_GP], &sc->gp); 122 __put_user(env->gpr[HEX_REG_UGP], &sc->ugp); 123 __put_user(env->gpr[HEX_REG_PC], &sc->pc); 124 } 125 126 static void setup_ucontext(struct target_ucontext *uc, 127 CPUHexagonState *env, target_sigset_t *set) 128 { 129 __put_user(0, &(uc->uc_flags)); 130 __put_user(0, &(uc->uc_link)); 131 132 target_save_altstack(&uc->uc_stack, env); 133 134 int i; 135 for (i = 0; i < TARGET_NSIG_WORDS; i++) { 136 __put_user(set->sig[i], &(uc->uc_sigmask.sig[i])); 137 } 138 139 setup_sigcontext(&uc->uc_mcontext, env); 140 } 141 142 static inline void install_sigtramp(uint32_t *tramp) 143 { 144 __put_user(0x7800d166, tramp + 0); /* { r6=#__NR_rt_sigreturn } */ 145 __put_user(0x5400c004, tramp + 1); /* { trap0(#1) } */ 146 } 147 148 void setup_rt_frame(int sig, struct target_sigaction *ka, 149 target_siginfo_t *info, 150 target_sigset_t *set, CPUHexagonState *env) 151 { 152 abi_ulong frame_addr; 153 struct target_rt_sigframe *frame; 154 155 frame_addr = get_sigframe(ka, env, sizeof(*frame)); 156 trace_user_setup_rt_frame(env, frame_addr); 157 158 if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { 159 goto badframe; 160 } 161 162 setup_ucontext(&frame->uc, env, set); 163 tswap_siginfo(&frame->info, info); 164 install_sigtramp(frame->tramp); 165 166 env->gpr[HEX_REG_PC] = ka->_sa_handler; 167 env->gpr[HEX_REG_SP] = frame_addr; 168 env->gpr[HEX_REG_R00] = sig; 169 env->gpr[HEX_REG_R01] = 170 frame_addr + offsetof(struct target_rt_sigframe, info); 171 env->gpr[HEX_REG_R02] = 172 frame_addr + offsetof(struct target_rt_sigframe, uc); 173 env->gpr[HEX_REG_LR] = 174 frame_addr + offsetof(struct target_rt_sigframe, tramp); 175 176 return; 177 178 badframe: 179 unlock_user_struct(frame, frame_addr, 1); 180 if (sig == TARGET_SIGSEGV) { 181 ka->_sa_handler = TARGET_SIG_DFL; 182 } 183 force_sig(TARGET_SIGSEGV); 184 } 185 186 static void restore_sigcontext(CPUHexagonState *env, 187 struct target_sigcontext *sc) 188 { 189 __get_user(env->gpr[HEX_REG_R00], &sc->r0); 190 __get_user(env->gpr[HEX_REG_R01], &sc->r1); 191 __get_user(env->gpr[HEX_REG_R02], &sc->r2); 192 __get_user(env->gpr[HEX_REG_R03], &sc->r3); 193 __get_user(env->gpr[HEX_REG_R04], &sc->r4); 194 __get_user(env->gpr[HEX_REG_R05], &sc->r5); 195 __get_user(env->gpr[HEX_REG_R06], &sc->r6); 196 __get_user(env->gpr[HEX_REG_R07], &sc->r7); 197 __get_user(env->gpr[HEX_REG_R08], &sc->r8); 198 __get_user(env->gpr[HEX_REG_R09], &sc->r9); 199 __get_user(env->gpr[HEX_REG_R10], &sc->r10); 200 __get_user(env->gpr[HEX_REG_R11], &sc->r11); 201 __get_user(env->gpr[HEX_REG_R12], &sc->r12); 202 __get_user(env->gpr[HEX_REG_R13], &sc->r13); 203 __get_user(env->gpr[HEX_REG_R14], &sc->r14); 204 __get_user(env->gpr[HEX_REG_R15], &sc->r15); 205 __get_user(env->gpr[HEX_REG_R16], &sc->r16); 206 __get_user(env->gpr[HEX_REG_R17], &sc->r17); 207 __get_user(env->gpr[HEX_REG_R18], &sc->r18); 208 __get_user(env->gpr[HEX_REG_R19], &sc->r19); 209 __get_user(env->gpr[HEX_REG_R20], &sc->r20); 210 __get_user(env->gpr[HEX_REG_R21], &sc->r21); 211 __get_user(env->gpr[HEX_REG_R22], &sc->r22); 212 __get_user(env->gpr[HEX_REG_R23], &sc->r23); 213 __get_user(env->gpr[HEX_REG_R24], &sc->r24); 214 __get_user(env->gpr[HEX_REG_R25], &sc->r25); 215 __get_user(env->gpr[HEX_REG_R26], &sc->r26); 216 __get_user(env->gpr[HEX_REG_R27], &sc->r27); 217 __get_user(env->gpr[HEX_REG_R28], &sc->r28); 218 __get_user(env->gpr[HEX_REG_R29], &sc->r29); 219 __get_user(env->gpr[HEX_REG_R30], &sc->r30); 220 __get_user(env->gpr[HEX_REG_R31], &sc->r31); 221 __get_user(env->gpr[HEX_REG_SA0], &sc->sa0); 222 __get_user(env->gpr[HEX_REG_LC0], &sc->lc0); 223 __get_user(env->gpr[HEX_REG_SA1], &sc->sa1); 224 __get_user(env->gpr[HEX_REG_LC1], &sc->lc1); 225 __get_user(env->gpr[HEX_REG_M0], &sc->m0); 226 __get_user(env->gpr[HEX_REG_M1], &sc->m1); 227 __get_user(env->gpr[HEX_REG_USR], &sc->usr); 228 __get_user(env->gpr[HEX_REG_P3_0], &sc->p3_0); 229 __get_user(env->gpr[HEX_REG_GP], &sc->gp); 230 __get_user(env->gpr[HEX_REG_UGP], &sc->ugp); 231 __get_user(env->gpr[HEX_REG_PC], &sc->pc); 232 } 233 234 static void restore_ucontext(CPUHexagonState *env, struct target_ucontext *uc) 235 { 236 sigset_t blocked; 237 target_sigset_t target_set; 238 int i; 239 240 target_sigemptyset(&target_set); 241 for (i = 0; i < TARGET_NSIG_WORDS; i++) { 242 __get_user(target_set.sig[i], &(uc->uc_sigmask.sig[i])); 243 } 244 245 target_to_host_sigset_internal(&blocked, &target_set); 246 set_sigmask(&blocked); 247 248 restore_sigcontext(env, &uc->uc_mcontext); 249 } 250 251 long do_rt_sigreturn(CPUHexagonState *env) 252 { 253 struct target_rt_sigframe *frame; 254 abi_ulong frame_addr; 255 256 frame_addr = env->gpr[HEX_REG_SP]; 257 trace_user_do_sigreturn(env, frame_addr); 258 if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { 259 goto badframe; 260 } 261 262 restore_ucontext(env, &frame->uc); 263 264 if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe, 265 uc.uc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT) { 266 goto badframe; 267 } 268 269 unlock_user_struct(frame, frame_addr, 0); 270 return -TARGET_QEMU_ESIGRETURN; 271 272 badframe: 273 unlock_user_struct(frame, frame_addr, 0); 274 force_sig(TARGET_SIGSEGV); 275 return 0; 276 } 277