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 "signal-common.h" 22 #include "linux-user/trace.h" 23 24 struct target_sigcontext { 25 abi_ulong sc_flags; 26 abi_ulong sc_gr[32]; 27 uint64_t sc_fr[32]; 28 abi_ulong sc_iasq[2]; 29 abi_ulong sc_iaoq[2]; 30 abi_ulong sc_sar; 31 }; 32 33 struct target_ucontext { 34 abi_uint tuc_flags; 35 abi_ulong tuc_link; 36 target_stack_t tuc_stack; 37 abi_uint pad[1]; 38 struct target_sigcontext tuc_mcontext; 39 target_sigset_t tuc_sigmask; 40 }; 41 42 struct target_rt_sigframe { 43 abi_uint tramp[9]; 44 target_siginfo_t info; 45 struct target_ucontext uc; 46 /* hidden location of upper halves of pa2.0 64-bit gregs */ 47 }; 48 49 static void setup_sigcontext(struct target_sigcontext *sc, CPUArchState *env) 50 { 51 int flags = 0; 52 int i; 53 54 /* ??? if on_sig_stack, flags |= 1 (PARISC_SC_FLAG_ONSTACK). */ 55 56 if (env->iaoq_f < TARGET_PAGE_SIZE) { 57 /* In the gateway page, executing a syscall. */ 58 flags |= 2; /* PARISC_SC_FLAG_IN_SYSCALL */ 59 __put_user(env->gr[31], &sc->sc_iaoq[0]); 60 __put_user(env->gr[31] + 4, &sc->sc_iaoq[1]); 61 } else { 62 __put_user(env->iaoq_f, &sc->sc_iaoq[0]); 63 __put_user(env->iaoq_b, &sc->sc_iaoq[1]); 64 } 65 __put_user(0, &sc->sc_iasq[0]); 66 __put_user(0, &sc->sc_iasq[1]); 67 __put_user(flags, &sc->sc_flags); 68 69 __put_user(cpu_hppa_get_psw(env), &sc->sc_gr[0]); 70 for (i = 1; i < 32; ++i) { 71 __put_user(env->gr[i], &sc->sc_gr[i]); 72 } 73 74 __put_user((uint64_t)env->fr0_shadow << 32, &sc->sc_fr[0]); 75 for (i = 1; i < 32; ++i) { 76 __put_user(env->fr[i], &sc->sc_fr[i]); 77 } 78 79 __put_user(env->cr[CR_SAR], &sc->sc_sar); 80 } 81 82 static void restore_sigcontext(CPUArchState *env, struct target_sigcontext *sc) 83 { 84 target_ulong psw; 85 int i; 86 87 __get_user(psw, &sc->sc_gr[0]); 88 cpu_hppa_put_psw(env, psw); 89 90 for (i = 1; i < 32; ++i) { 91 __get_user(env->gr[i], &sc->sc_gr[i]); 92 } 93 for (i = 0; i < 32; ++i) { 94 __get_user(env->fr[i], &sc->sc_fr[i]); 95 } 96 cpu_hppa_loaded_fr0(env); 97 98 __get_user(env->iaoq_f, &sc->sc_iaoq[0]); 99 __get_user(env->iaoq_b, &sc->sc_iaoq[1]); 100 __get_user(env->cr[CR_SAR], &sc->sc_sar); 101 } 102 103 /* No, this doesn't look right, but it's copied straight from the kernel. */ 104 #define PARISC_RT_SIGFRAME_SIZE32 \ 105 ((sizeof(struct target_rt_sigframe) + 48 + 64) & -64) 106 107 void setup_rt_frame(int sig, struct target_sigaction *ka, 108 target_siginfo_t *info, 109 target_sigset_t *set, CPUArchState *env) 110 { 111 abi_ulong frame_addr, sp, haddr; 112 struct target_rt_sigframe *frame; 113 int i; 114 115 sp = get_sp_from_cpustate(env); 116 if ((ka->sa_flags & TARGET_SA_ONSTACK) && !sas_ss_flags(sp)) { 117 sp = (target_sigaltstack_used.ss_sp + 0x7f) & ~0x3f; 118 } 119 frame_addr = QEMU_ALIGN_UP(sp, 64); 120 sp = frame_addr + PARISC_RT_SIGFRAME_SIZE32; 121 122 trace_user_setup_rt_frame(env, frame_addr); 123 124 if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { 125 goto give_sigsegv; 126 } 127 128 tswap_siginfo(&frame->info, info); 129 frame->uc.tuc_flags = 0; 130 frame->uc.tuc_link = 0; 131 132 target_save_altstack(&frame->uc.tuc_stack, env); 133 134 for (i = 0; i < TARGET_NSIG_WORDS; i++) { 135 __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]); 136 } 137 138 setup_sigcontext(&frame->uc.tuc_mcontext, env); 139 140 __put_user(0x34190000, frame->tramp + 0); /* ldi 0,%r25 */ 141 __put_user(0x3414015a, frame->tramp + 1); /* ldi __NR_rt_sigreturn,%r20 */ 142 __put_user(0xe4008200, frame->tramp + 2); /* be,l 0x100(%sr2,%r0) */ 143 __put_user(0x08000240, frame->tramp + 3); /* nop */ 144 145 unlock_user_struct(frame, frame_addr, 1); 146 147 env->gr[2] = h2g(frame->tramp); 148 env->gr[30] = sp; 149 env->gr[26] = sig; 150 env->gr[25] = h2g(&frame->info); 151 env->gr[24] = h2g(&frame->uc); 152 153 haddr = ka->_sa_handler; 154 if (haddr & 2) { 155 /* Function descriptor. */ 156 target_ulong *fdesc, dest; 157 158 haddr &= -4; 159 if (!lock_user_struct(VERIFY_READ, fdesc, haddr, 1)) { 160 goto give_sigsegv; 161 } 162 __get_user(dest, fdesc); 163 __get_user(env->gr[19], fdesc + 1); 164 unlock_user_struct(fdesc, haddr, 1); 165 haddr = dest; 166 } 167 env->iaoq_f = haddr; 168 env->iaoq_b = haddr + 4; 169 return; 170 171 give_sigsegv: 172 force_sigsegv(sig); 173 } 174 175 long do_rt_sigreturn(CPUArchState *env) 176 { 177 abi_ulong frame_addr = env->gr[30] - PARISC_RT_SIGFRAME_SIZE32; 178 struct target_rt_sigframe *frame; 179 sigset_t set; 180 181 trace_user_do_rt_sigreturn(env, frame_addr); 182 if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { 183 goto badframe; 184 } 185 target_to_host_sigset(&set, &frame->uc.tuc_sigmask); 186 set_sigmask(&set); 187 188 restore_sigcontext(env, &frame->uc.tuc_mcontext); 189 unlock_user_struct(frame, frame_addr, 0); 190 191 if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe, 192 uc.tuc_stack), 193 0, env->gr[30]) == -EFAULT) { 194 goto badframe; 195 } 196 197 unlock_user_struct(frame, frame_addr, 0); 198 return -TARGET_QEMU_ESIGRETURN; 199 200 badframe: 201 force_sig(TARGET_SIGSEGV); 202 return -TARGET_QEMU_ESIGRETURN; 203 } 204