277 lines
7.4 KiB
C
277 lines
7.4 KiB
C
/*
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* Emulation of Linux signals
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qemu.h"
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#include "user-internals.h"
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#include "signal-common.h"
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#include "linux-user/trace.h"
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struct target_sigcontext {
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abi_long sc_onstack;
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abi_long sc_mask;
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abi_long sc_pc;
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abi_long sc_ps;
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abi_long sc_regs[32];
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abi_long sc_ownedfp;
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abi_long sc_fpregs[32];
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abi_ulong sc_fpcr;
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abi_ulong sc_fp_control;
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abi_ulong sc_reserved1;
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abi_ulong sc_reserved2;
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abi_ulong sc_ssize;
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abi_ulong sc_sbase;
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abi_ulong sc_traparg_a0;
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abi_ulong sc_traparg_a1;
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abi_ulong sc_traparg_a2;
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abi_ulong sc_fp_trap_pc;
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abi_ulong sc_fp_trigger_sum;
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abi_ulong sc_fp_trigger_inst;
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};
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struct target_ucontext {
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abi_ulong tuc_flags;
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abi_ulong tuc_link;
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abi_ulong tuc_osf_sigmask;
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target_stack_t tuc_stack;
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struct target_sigcontext tuc_mcontext;
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target_sigset_t tuc_sigmask;
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};
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struct target_sigframe {
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struct target_sigcontext sc;
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};
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struct target_rt_sigframe {
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target_siginfo_t info;
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struct target_ucontext uc;
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};
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#define INSN_MOV_R30_R16 0x47fe0410
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#define INSN_LDI_R0 0x201f0000
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#define INSN_CALLSYS 0x00000083
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static void setup_sigcontext(struct target_sigcontext *sc, CPUAlphaState *env,
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abi_ulong frame_addr, target_sigset_t *set)
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{
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int i;
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__put_user(on_sig_stack(frame_addr), &sc->sc_onstack);
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__put_user(set->sig[0], &sc->sc_mask);
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__put_user(env->pc, &sc->sc_pc);
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__put_user(8, &sc->sc_ps);
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for (i = 0; i < 31; ++i) {
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__put_user(env->ir[i], &sc->sc_regs[i]);
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}
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__put_user(0, &sc->sc_regs[31]);
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for (i = 0; i < 31; ++i) {
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__put_user(env->fir[i], &sc->sc_fpregs[i]);
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}
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__put_user(0, &sc->sc_fpregs[31]);
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__put_user(cpu_alpha_load_fpcr(env), &sc->sc_fpcr);
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__put_user(0, &sc->sc_traparg_a0); /* FIXME */
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__put_user(0, &sc->sc_traparg_a1); /* FIXME */
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__put_user(0, &sc->sc_traparg_a2); /* FIXME */
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}
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static void restore_sigcontext(CPUAlphaState *env,
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struct target_sigcontext *sc)
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{
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uint64_t fpcr;
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int i;
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__get_user(env->pc, &sc->sc_pc);
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for (i = 0; i < 31; ++i) {
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__get_user(env->ir[i], &sc->sc_regs[i]);
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}
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for (i = 0; i < 31; ++i) {
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__get_user(env->fir[i], &sc->sc_fpregs[i]);
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}
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__get_user(fpcr, &sc->sc_fpcr);
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cpu_alpha_store_fpcr(env, fpcr);
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}
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static inline abi_ulong get_sigframe(struct target_sigaction *sa,
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CPUAlphaState *env,
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unsigned long framesize)
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{
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abi_ulong sp;
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sp = target_sigsp(get_sp_from_cpustate(env), sa);
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return (sp - framesize) & -32;
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}
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void setup_frame(int sig, struct target_sigaction *ka,
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target_sigset_t *set, CPUAlphaState *env)
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{
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abi_ulong frame_addr, r26;
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struct target_sigframe *frame;
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int err = 0;
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frame_addr = get_sigframe(ka, env, sizeof(*frame));
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trace_user_setup_frame(env, frame_addr);
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if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
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goto give_sigsegv;
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}
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setup_sigcontext(&frame->sc, env, frame_addr, set);
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if (ka->ka_restorer) {
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r26 = ka->ka_restorer;
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} else {
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r26 = default_sigreturn;
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}
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unlock_user_struct(frame, frame_addr, 1);
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if (err) {
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give_sigsegv:
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force_sigsegv(sig);
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return;
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}
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env->ir[IR_RA] = r26;
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env->ir[IR_PV] = env->pc = ka->_sa_handler;
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env->ir[IR_A0] = sig;
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env->ir[IR_A1] = 0;
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env->ir[IR_A2] = frame_addr + offsetof(struct target_sigframe, sc);
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env->ir[IR_SP] = frame_addr;
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}
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void setup_rt_frame(int sig, struct target_sigaction *ka,
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target_siginfo_t *info,
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target_sigset_t *set, CPUAlphaState *env)
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{
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abi_ulong frame_addr, r26;
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struct target_rt_sigframe *frame;
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int i, err = 0;
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frame_addr = get_sigframe(ka, env, sizeof(*frame));
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trace_user_setup_rt_frame(env, frame_addr);
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if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
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goto give_sigsegv;
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}
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tswap_siginfo(&frame->info, info);
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__put_user(0, &frame->uc.tuc_flags);
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__put_user(0, &frame->uc.tuc_link);
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__put_user(set->sig[0], &frame->uc.tuc_osf_sigmask);
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target_save_altstack(&frame->uc.tuc_stack, env);
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setup_sigcontext(&frame->uc.tuc_mcontext, env, frame_addr, set);
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for (i = 0; i < TARGET_NSIG_WORDS; ++i) {
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__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
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}
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if (ka->ka_restorer) {
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r26 = ka->ka_restorer;
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} else {
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r26 = default_rt_sigreturn;
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}
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if (err) {
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give_sigsegv:
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force_sigsegv(sig);
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return;
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}
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env->ir[IR_RA] = r26;
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env->ir[IR_PV] = env->pc = ka->_sa_handler;
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env->ir[IR_A0] = sig;
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env->ir[IR_A1] = frame_addr + offsetof(struct target_rt_sigframe, info);
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env->ir[IR_A2] = frame_addr + offsetof(struct target_rt_sigframe, uc);
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env->ir[IR_SP] = frame_addr;
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}
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long do_sigreturn(CPUAlphaState *env)
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{
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struct target_sigcontext *sc;
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abi_ulong sc_addr = env->ir[IR_A0];
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target_sigset_t target_set;
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sigset_t set;
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if (!lock_user_struct(VERIFY_READ, sc, sc_addr, 1)) {
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goto badframe;
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}
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target_sigemptyset(&target_set);
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__get_user(target_set.sig[0], &sc->sc_mask);
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target_to_host_sigset_internal(&set, &target_set);
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set_sigmask(&set);
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restore_sigcontext(env, sc);
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unlock_user_struct(sc, sc_addr, 0);
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return -QEMU_ESIGRETURN;
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badframe:
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force_sig(TARGET_SIGSEGV);
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return -QEMU_ESIGRETURN;
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}
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long do_rt_sigreturn(CPUAlphaState *env)
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{
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abi_ulong frame_addr = env->ir[IR_A0];
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struct target_rt_sigframe *frame;
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sigset_t set;
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trace_user_do_rt_sigreturn(env, frame_addr);
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if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
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goto badframe;
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}
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target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
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set_sigmask(&set);
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restore_sigcontext(env, &frame->uc.tuc_mcontext);
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target_restore_altstack(&frame->uc.tuc_stack, env);
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unlock_user_struct(frame, frame_addr, 0);
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return -QEMU_ESIGRETURN;
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badframe:
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unlock_user_struct(frame, frame_addr, 0);
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force_sig(TARGET_SIGSEGV);
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return -QEMU_ESIGRETURN;
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}
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void setup_sigtramp(abi_ulong sigtramp_page)
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{
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uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 6 * 4, 0);
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assert(tramp != NULL);
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default_sigreturn = sigtramp_page;
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__put_user(INSN_MOV_R30_R16, &tramp[0]);
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__put_user(INSN_LDI_R0 + TARGET_NR_sigreturn, &tramp[1]);
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__put_user(INSN_CALLSYS, &tramp[2]);
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default_rt_sigreturn = sigtramp_page + 3 * 4;
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__put_user(INSN_MOV_R30_R16, &tramp[3]);
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__put_user(INSN_LDI_R0 + TARGET_NR_rt_sigreturn, &tramp[4]);
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__put_user(INSN_CALLSYS, &tramp[5]);
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unlock_user(tramp, sigtramp_page, 6 * 4);
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}
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