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- /*
- * Emulation of Linux signals
- *
- * Copyright (c) 2003 Fabrice Bellard
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
- */
- #include "qemu/osdep.h"
- #include "qemu.h"
- #include "user-internals.h"
- #include "signal-common.h"
- #include "linux-user/trace.h"
- #include "vdso-asmoffset.h"
- struct target_sigcontext {
- abi_ulong sc_flags;
- abi_ulong sc_gr[32];
- abi_ullong sc_fr[32];
- abi_ulong sc_iasq[2];
- abi_ulong sc_iaoq[2];
- abi_ulong sc_sar;
- };
- struct target_ucontext {
- abi_uint tuc_flags;
- abi_ulong tuc_link;
- target_stack_t tuc_stack;
- abi_uint pad[1];
- struct target_sigcontext tuc_mcontext;
- target_sigset_t tuc_sigmask;
- };
- struct target_rt_sigframe {
- abi_uint tramp[2]; /* syscall restart return address */
- target_siginfo_t info;
- struct target_ucontext uc;
- /* hidden location of upper halves of pa2.0 64-bit gregs */
- };
- QEMU_BUILD_BUG_ON(sizeof(struct target_rt_sigframe) != sizeof_rt_sigframe);
- QEMU_BUILD_BUG_ON(offsetof(struct target_rt_sigframe, uc.tuc_mcontext)
- != offsetof_sigcontext);
- QEMU_BUILD_BUG_ON(offsetof(struct target_sigcontext, sc_gr)
- != offsetof_sigcontext_gr);
- QEMU_BUILD_BUG_ON(offsetof(struct target_sigcontext, sc_fr)
- != offsetof_sigcontext_fr);
- QEMU_BUILD_BUG_ON(offsetof(struct target_sigcontext, sc_iaoq)
- != offsetof_sigcontext_iaoq);
- QEMU_BUILD_BUG_ON(offsetof(struct target_sigcontext, sc_sar)
- != offsetof_sigcontext_sar);
- static void setup_sigcontext(struct target_sigcontext *sc, CPUArchState *env)
- {
- int i;
- __put_user(env->iaoq_f, &sc->sc_iaoq[0]);
- __put_user(env->iaoq_b, &sc->sc_iaoq[1]);
- __put_user(0, &sc->sc_iasq[0]);
- __put_user(0, &sc->sc_iasq[1]);
- __put_user(0, &sc->sc_flags);
- __put_user(cpu_hppa_get_psw(env), &sc->sc_gr[0]);
- for (i = 1; i < 32; ++i) {
- __put_user(env->gr[i], &sc->sc_gr[i]);
- }
- __put_user((uint64_t)env->fr0_shadow << 32, &sc->sc_fr[0]);
- for (i = 1; i < 32; ++i) {
- __put_user(env->fr[i], &sc->sc_fr[i]);
- }
- __put_user(env->cr[CR_SAR], &sc->sc_sar);
- }
- static void restore_sigcontext(CPUArchState *env, struct target_sigcontext *sc)
- {
- abi_ulong psw;
- int i;
- __get_user(psw, &sc->sc_gr[0]);
- cpu_hppa_put_psw(env, psw);
- for (i = 1; i < 32; ++i) {
- __get_user(env->gr[i], &sc->sc_gr[i]);
- }
- for (i = 0; i < 32; ++i) {
- __get_user(env->fr[i], &sc->sc_fr[i]);
- }
- cpu_hppa_loaded_fr0(env);
- __get_user(env->iaoq_f, &sc->sc_iaoq[0]);
- env->iaoq_f |= PRIV_USER;
- __get_user(env->iaoq_b, &sc->sc_iaoq[1]);
- env->iaoq_b |= PRIV_USER;
- __get_user(env->cr[CR_SAR], &sc->sc_sar);
- }
- void setup_rt_frame(int sig, struct target_sigaction *ka,
- target_siginfo_t *info,
- target_sigset_t *set, CPUArchState *env)
- {
- abi_ulong frame_addr, sp, haddr;
- struct target_rt_sigframe *frame;
- int i;
- TaskState *ts = get_task_state(thread_cpu);
- sp = get_sp_from_cpustate(env);
- if ((ka->sa_flags & TARGET_SA_ONSTACK) && !sas_ss_flags(sp)) {
- sp = (ts->sigaltstack_used.ss_sp + 0x7f) & ~0x3f;
- }
- frame_addr = QEMU_ALIGN_UP(sp, SIGFRAME);
- sp = frame_addr + PARISC_RT_SIGFRAME_SIZE32;
- trace_user_setup_rt_frame(env, frame_addr);
- if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
- goto give_sigsegv;
- }
- frame->info = *info;
- frame->uc.tuc_flags = 0;
- frame->uc.tuc_link = 0;
- target_save_altstack(&frame->uc.tuc_stack, env);
- for (i = 0; i < TARGET_NSIG_WORDS; i++) {
- __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
- }
- setup_sigcontext(&frame->uc.tuc_mcontext, env);
- unlock_user_struct(frame, frame_addr, 1);
- env->gr[2] = default_rt_sigreturn;
- env->gr[30] = sp;
- env->gr[26] = sig;
- env->gr[25] = h2g(&frame->info);
- env->gr[24] = h2g(&frame->uc);
- haddr = ka->_sa_handler;
- if (haddr & 2) {
- /* Function descriptor. */
- abi_ptr *fdesc, dest;
- haddr &= -4;
- fdesc = lock_user(VERIFY_READ, haddr, 2 * sizeof(abi_ptr), 1);
- if (!fdesc) {
- goto give_sigsegv;
- }
- __get_user(dest, fdesc);
- __get_user(env->gr[19], fdesc + 1);
- unlock_user(fdesc, haddr, 0);
- haddr = dest;
- }
- env->iaoq_f = haddr | PRIV_USER;
- env->iaoq_b = env->iaoq_f + 4;
- env->psw_n = 0;
- return;
- give_sigsegv:
- force_sigsegv(sig);
- }
- long do_rt_sigreturn(CPUArchState *env)
- {
- abi_ulong frame_addr = env->gr[30] - PARISC_RT_SIGFRAME_SIZE32;
- struct target_rt_sigframe *frame;
- sigset_t set;
- trace_user_do_rt_sigreturn(env, frame_addr);
- if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
- goto badframe;
- }
- target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
- set_sigmask(&set);
- restore_sigcontext(env, &frame->uc.tuc_mcontext);
- target_restore_altstack(&frame->uc.tuc_stack, env);
- unlock_user_struct(frame, frame_addr, 0);
- return -QEMU_ESIGRETURN;
- badframe:
- force_sig(TARGET_SIGSEGV);
- return -QEMU_ESIGRETURN;
- }
- void setup_sigtramp(abi_ulong sigtramp_page)
- {
- uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 6*4, 0);
- abi_ulong SIGFRAME_CONTEXT_REGS32;
- assert(tramp != NULL);
- SIGFRAME_CONTEXT_REGS32 = offsetof(struct target_rt_sigframe, uc.tuc_mcontext);
- SIGFRAME_CONTEXT_REGS32 -= PARISC_RT_SIGFRAME_SIZE32;
- __put_user(SIGFRAME_CONTEXT_REGS32, tramp + 0);
- __put_user(0x08000240, tramp + 1); /* nop - b/c dwarf2 unwind routines */
- __put_user(0x34190000, tramp + 2); /* ldi 0, %r25 (in_syscall=0) */
- __put_user(0x3414015a, tramp + 3); /* ldi __NR_rt_sigreturn, %r20 */
- __put_user(0xe4008200, tramp + 4); /* ble 0x100(%sr2, %r0) */
- __put_user(0x08000240, tramp + 5); /* nop */
- default_rt_sigreturn = (sigtramp_page + 8) | 3;
- unlock_user(tramp, sigtramp_page, 6*4);
- }
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