| 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 | #include "vdso-asmoffset.h" |
| 25 | |
| 26 | struct target_sigcontext { |
| 27 | abi_ulong sc_flags; |
| 28 | abi_ulong sc_gr[32]; |
| 29 | abi_ullong sc_fr[32]; |
| 30 | abi_ulong sc_iasq[2]; |
| 31 | abi_ulong sc_iaoq[2]; |
| 32 | abi_ulong sc_sar; |
| 33 | }; |
| 34 | |
| 35 | struct target_ucontext { |
| 36 | abi_uint tuc_flags; |
| 37 | abi_ulong tuc_link; |
| 38 | target_stack_t tuc_stack; |
| 39 | abi_uint pad[1]; |
| 40 | struct target_sigcontext tuc_mcontext; |
| 41 | target_sigset_t tuc_sigmask; |
| 42 | }; |
| 43 | |
| 44 | struct target_rt_sigframe { |
| 45 | abi_uint tramp[2]; /* syscall restart return address */ |
| 46 | target_siginfo_t info; |
| 47 | struct target_ucontext uc; |
| 48 | /* hidden location of upper halves of pa2.0 64-bit gregs */ |
| 49 | }; |
| 50 | |
| 51 | QEMU_BUILD_BUG_ON(sizeof(struct target_rt_sigframe) != sizeof_rt_sigframe); |
| 52 | QEMU_BUILD_BUG_ON(offsetof(struct target_rt_sigframe, uc.tuc_mcontext) |
| 53 | != offsetof_sigcontext); |
| 54 | QEMU_BUILD_BUG_ON(offsetof(struct target_sigcontext, sc_gr) |
| 55 | != offsetof_sigcontext_gr); |
| 56 | QEMU_BUILD_BUG_ON(offsetof(struct target_sigcontext, sc_fr) |
| 57 | != offsetof_sigcontext_fr); |
| 58 | QEMU_BUILD_BUG_ON(offsetof(struct target_sigcontext, sc_iaoq) |
| 59 | != offsetof_sigcontext_iaoq); |
| 60 | QEMU_BUILD_BUG_ON(offsetof(struct target_sigcontext, sc_sar) |
| 61 | != offsetof_sigcontext_sar); |
| 62 | |
| 63 | |
| 64 | static void setup_sigcontext(struct target_sigcontext *sc, CPUArchState *env) |
| 65 | { |
| 66 | int i; |
| 67 | |
| 68 | __put_user(env->iaoq_f, &sc->sc_iaoq[0]); |
| 69 | __put_user(env->iaoq_b, &sc->sc_iaoq[1]); |
| 70 | __put_user(0, &sc->sc_iasq[0]); |
| 71 | __put_user(0, &sc->sc_iasq[1]); |
| 72 | __put_user(0, &sc->sc_flags); |
| 73 | |
| 74 | __put_user(cpu_hppa_get_psw(env), &sc->sc_gr[0]); |
| 75 | for (i = 1; i < 32; ++i) { |
| 76 | __put_user(env->gr[i], &sc->sc_gr[i]); |
| 77 | } |
| 78 | |
| 79 | __put_user((uint64_t)env->fr0_shadow << 32, &sc->sc_fr[0]); |
| 80 | for (i = 1; i < 32; ++i) { |
| 81 | __put_user(env->fr[i], &sc->sc_fr[i]); |
| 82 | } |
| 83 | |
| 84 | __put_user(env->cr[CR_SAR], &sc->sc_sar); |
| 85 | } |
| 86 | |
| 87 | static void restore_sigcontext(CPUArchState *env, struct target_sigcontext *sc) |
| 88 | { |
| 89 | abi_ulong psw; |
| 90 | int i; |
| 91 | |
| 92 | __get_user(psw, &sc->sc_gr[0]); |
| 93 | cpu_hppa_put_psw(env, psw); |
| 94 | |
| 95 | for (i = 1; i < 32; ++i) { |
| 96 | __get_user(env->gr[i], &sc->sc_gr[i]); |
| 97 | } |
| 98 | for (i = 0; i < 32; ++i) { |
| 99 | __get_user(env->fr[i], &sc->sc_fr[i]); |
| 100 | } |
| 101 | cpu_hppa_loaded_fr0(env); |
| 102 | |
| 103 | __get_user(env->iaoq_f, &sc->sc_iaoq[0]); |
| 104 | env->iaoq_f |= PRIV_USER; |
| 105 | __get_user(env->iaoq_b, &sc->sc_iaoq[1]); |
| 106 | env->iaoq_b |= PRIV_USER; |
| 107 | __get_user(env->cr[CR_SAR], &sc->sc_sar); |
| 108 | } |
| 109 | |
| 110 | void setup_rt_frame(int sig, struct target_sigaction *ka, |
| 111 | target_siginfo_t *info, |
| 112 | target_sigset_t *set, CPUArchState *env) |
| 113 | { |
| 114 | abi_ulong frame_addr, sp, haddr; |
| 115 | struct target_rt_sigframe *frame; |
| 116 | int i; |
| 117 | TaskState *ts = get_task_state(thread_cpu); |
| 118 | |
| 119 | sp = get_sp_from_cpustate(env); |
| 120 | if ((ka->sa_flags & TARGET_SA_ONSTACK) && !sas_ss_flags(sp)) { |
| 121 | sp = (ts->sigaltstack_used.ss_sp + 0x7f) & ~0x3f; |
| 122 | } |
| 123 | frame_addr = QEMU_ALIGN_UP(sp, SIGFRAME); |
| 124 | sp = frame_addr + PARISC_RT_SIGFRAME_SIZE32; |
| 125 | |
| 126 | trace_user_setup_rt_frame(env, frame_addr); |
| 127 | |
| 128 | if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { |
| 129 | goto give_sigsegv; |
| 130 | } |
| 131 | |
| 132 | frame->info = *info; |
| 133 | frame->uc.tuc_flags = 0; |
| 134 | frame->uc.tuc_link = 0; |
| 135 | |
| 136 | target_save_altstack(&frame->uc.tuc_stack, env); |
| 137 | |
| 138 | for (i = 0; i < TARGET_NSIG_WORDS; i++) { |
| 139 | __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]); |
| 140 | } |
| 141 | |
| 142 | setup_sigcontext(&frame->uc.tuc_mcontext, env); |
| 143 | |
| 144 | unlock_user_struct(frame, frame_addr, 1); |
| 145 | |
| 146 | env->gr[2] = default_rt_sigreturn; |
| 147 | env->gr[30] = sp; |
| 148 | env->gr[26] = sig; |
| 149 | env->gr[25] = h2g(&frame->info); |
| 150 | env->gr[24] = h2g(&frame->uc); |
| 151 | |
| 152 | haddr = ka->_sa_handler; |
| 153 | if (haddr & 2) { |
| 154 | /* Function descriptor. */ |
| 155 | abi_ptr *fdesc, dest; |
| 156 | |
| 157 | haddr &= -4; |
| 158 | fdesc = lock_user(VERIFY_READ, haddr, 2 * sizeof(abi_ptr), 1); |
| 159 | if (!fdesc) { |
| 160 | goto give_sigsegv; |
| 161 | } |
| 162 | __get_user(dest, fdesc); |
| 163 | __get_user(env->gr[19], fdesc + 1); |
| 164 | unlock_user(fdesc, haddr, 0); |
| 165 | haddr = dest; |
| 166 | } |
| 167 | env->iaoq_f = haddr | PRIV_USER; |
| 168 | env->iaoq_b = env->iaoq_f + 4; |
| 169 | env->psw_n = 0; |
| 170 | return; |
| 171 | |
| 172 | give_sigsegv: |
| 173 | force_sigsegv(sig); |
| 174 | } |
| 175 | |
| 176 | long do_rt_sigreturn(CPUArchState *env) |
| 177 | { |
| 178 | abi_ulong frame_addr = env->gr[30] - PARISC_RT_SIGFRAME_SIZE32; |
| 179 | struct target_rt_sigframe *frame; |
| 180 | sigset_t set; |
| 181 | |
| 182 | trace_user_do_rt_sigreturn(env, frame_addr); |
| 183 | if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { |
| 184 | goto badframe; |
| 185 | } |
| 186 | target_to_host_sigset(&set, &frame->uc.tuc_sigmask); |
| 187 | set_sigmask(&set); |
| 188 | |
| 189 | restore_sigcontext(env, &frame->uc.tuc_mcontext); |
| 190 | target_restore_altstack(&frame->uc.tuc_stack, env); |
| 191 | |
| 192 | unlock_user_struct(frame, frame_addr, 0); |
| 193 | return -QEMU_ESIGRETURN; |
| 194 | |
| 195 | badframe: |
| 196 | force_sig(TARGET_SIGSEGV); |
| 197 | return -QEMU_ESIGRETURN; |
| 198 | } |
| 199 | |
| 200 | void setup_sigtramp(abi_ulong sigtramp_page) |
| 201 | { |
| 202 | uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 6*4, 0); |
| 203 | abi_ulong SIGFRAME_CONTEXT_REGS32; |
| 204 | assert(tramp != NULL); |
| 205 | |
| 206 | SIGFRAME_CONTEXT_REGS32 = offsetof(struct target_rt_sigframe, uc.tuc_mcontext); |
| 207 | SIGFRAME_CONTEXT_REGS32 -= PARISC_RT_SIGFRAME_SIZE32; |
| 208 | |
| 209 | __put_user(SIGFRAME_CONTEXT_REGS32, tramp + 0); |
| 210 | __put_user(0x08000240, tramp + 1); /* nop - b/c dwarf2 unwind routines */ |
| 211 | __put_user(0x34190000, tramp + 2); /* ldi 0, %r25 (in_syscall=0) */ |
| 212 | __put_user(0x3414015a, tramp + 3); /* ldi __NR_rt_sigreturn, %r20 */ |
| 213 | __put_user(0xe4008200, tramp + 4); /* ble 0x100(%sr2, %r0) */ |
| 214 | __put_user(0x08000240, tramp + 5); /* nop */ |
| 215 | |
| 216 | default_rt_sigreturn = (sigtramp_page + 8) | 3; |
| 217 | unlock_user(tramp, sigtramp_page, 6*4); |
| 218 | } |