mirror of https://gitee.com/openkylin/qemu.git
237 lines
7.2 KiB
C
237 lines
7.2 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 "signal-common.h"
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#include "linux-user/trace.h"
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#define MCONTEXT_VERSION 2
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struct target_sigcontext {
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int version;
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unsigned long gregs[32];
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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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target_stack_t tuc_stack;
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struct target_sigcontext tuc_mcontext;
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target_sigset_t tuc_sigmask; /* mask last for extensibility */
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};
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struct target_rt_sigframe {
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struct target_siginfo info;
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struct target_ucontext uc;
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};
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static int rt_setup_ucontext(struct target_ucontext *uc, CPUNios2State *env)
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{
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unsigned long *gregs = uc->tuc_mcontext.gregs;
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__put_user(MCONTEXT_VERSION, &uc->tuc_mcontext.version);
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__put_user(env->regs[1], &gregs[0]);
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__put_user(env->regs[2], &gregs[1]);
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__put_user(env->regs[3], &gregs[2]);
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__put_user(env->regs[4], &gregs[3]);
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__put_user(env->regs[5], &gregs[4]);
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__put_user(env->regs[6], &gregs[5]);
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__put_user(env->regs[7], &gregs[6]);
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__put_user(env->regs[8], &gregs[7]);
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__put_user(env->regs[9], &gregs[8]);
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__put_user(env->regs[10], &gregs[9]);
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__put_user(env->regs[11], &gregs[10]);
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__put_user(env->regs[12], &gregs[11]);
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__put_user(env->regs[13], &gregs[12]);
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__put_user(env->regs[14], &gregs[13]);
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__put_user(env->regs[15], &gregs[14]);
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__put_user(env->regs[16], &gregs[15]);
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__put_user(env->regs[17], &gregs[16]);
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__put_user(env->regs[18], &gregs[17]);
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__put_user(env->regs[19], &gregs[18]);
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__put_user(env->regs[20], &gregs[19]);
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__put_user(env->regs[21], &gregs[20]);
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__put_user(env->regs[22], &gregs[21]);
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__put_user(env->regs[23], &gregs[22]);
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__put_user(env->regs[R_RA], &gregs[23]);
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__put_user(env->regs[R_FP], &gregs[24]);
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__put_user(env->regs[R_GP], &gregs[25]);
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__put_user(env->regs[R_EA], &gregs[27]);
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__put_user(env->regs[R_SP], &gregs[28]);
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return 0;
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}
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static int rt_restore_ucontext(CPUNios2State *env, struct target_ucontext *uc,
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int *pr2)
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{
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int temp;
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abi_ulong off, frame_addr = env->regs[R_SP];
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unsigned long *gregs = uc->tuc_mcontext.gregs;
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int err;
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/* Always make any pending restarted system calls return -EINTR */
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/* current->restart_block.fn = do_no_restart_syscall; */
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__get_user(temp, &uc->tuc_mcontext.version);
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if (temp != MCONTEXT_VERSION) {
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return 1;
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}
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/* restore passed registers */
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__get_user(env->regs[1], &gregs[0]);
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__get_user(env->regs[2], &gregs[1]);
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__get_user(env->regs[3], &gregs[2]);
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__get_user(env->regs[4], &gregs[3]);
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__get_user(env->regs[5], &gregs[4]);
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__get_user(env->regs[6], &gregs[5]);
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__get_user(env->regs[7], &gregs[6]);
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__get_user(env->regs[8], &gregs[7]);
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__get_user(env->regs[9], &gregs[8]);
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__get_user(env->regs[10], &gregs[9]);
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__get_user(env->regs[11], &gregs[10]);
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__get_user(env->regs[12], &gregs[11]);
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__get_user(env->regs[13], &gregs[12]);
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__get_user(env->regs[14], &gregs[13]);
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__get_user(env->regs[15], &gregs[14]);
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__get_user(env->regs[16], &gregs[15]);
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__get_user(env->regs[17], &gregs[16]);
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__get_user(env->regs[18], &gregs[17]);
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__get_user(env->regs[19], &gregs[18]);
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__get_user(env->regs[20], &gregs[19]);
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__get_user(env->regs[21], &gregs[20]);
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__get_user(env->regs[22], &gregs[21]);
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__get_user(env->regs[23], &gregs[22]);
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/* gregs[23] is handled below */
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/* Verify, should this be settable */
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__get_user(env->regs[R_FP], &gregs[24]);
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/* Verify, should this be settable */
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__get_user(env->regs[R_GP], &gregs[25]);
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/* Not really necessary no user settable bits */
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__get_user(temp, &gregs[26]);
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__get_user(env->regs[R_EA], &gregs[27]);
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__get_user(env->regs[R_RA], &gregs[23]);
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__get_user(env->regs[R_SP], &gregs[28]);
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off = offsetof(struct target_rt_sigframe, uc.tuc_stack);
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err = do_sigaltstack(frame_addr + off, 0, get_sp_from_cpustate(env));
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if (err == -EFAULT) {
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return 1;
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}
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*pr2 = env->regs[2];
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return 0;
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}
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static void *get_sigframe(struct target_sigaction *ka, CPUNios2State *env,
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size_t frame_size)
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{
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unsigned long usp;
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/* This is the X/Open sanctioned signal stack switching. */
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usp = target_sigsp(get_sp_from_cpustate(env), ka);
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/* Verify, is it 32 or 64 bit aligned */
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return (void *)((usp - frame_size) & -8UL);
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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,
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CPUNios2State *env)
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{
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struct target_rt_sigframe *frame;
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int i, err = 0;
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frame = get_sigframe(ka, env, sizeof(*frame));
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if (ka->sa_flags & SA_SIGINFO) {
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tswap_siginfo(&frame->info, info);
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}
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/* Create the ucontext. */
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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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target_save_altstack(&frame->uc.tuc_stack, env);
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err |= rt_setup_ucontext(&frame->uc, env);
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for (i = 0; i < TARGET_NSIG_WORDS; i++) {
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__put_user((abi_ulong)set->sig[i],
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(abi_ulong *)&frame->uc.tuc_sigmask.sig[i]);
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}
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if (err) {
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goto give_sigsegv;
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}
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/* Set up to return from userspace; jump to fixed address sigreturn
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trampoline on kuser page. */
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env->regs[R_RA] = (unsigned long) (0x1044);
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/* Set up registers for signal handler */
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env->regs[R_SP] = (unsigned long) frame;
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env->regs[4] = (unsigned long) sig;
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env->regs[5] = (unsigned long) &frame->info;
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env->regs[6] = (unsigned long) &frame->uc;
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env->regs[R_EA] = (unsigned long) ka->_sa_handler;
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return;
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give_sigsegv:
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if (sig == TARGET_SIGSEGV) {
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ka->_sa_handler = TARGET_SIG_DFL;
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}
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force_sigsegv(sig);
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return;
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}
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long do_sigreturn(CPUNios2State *env)
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{
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trace_user_do_sigreturn(env, 0);
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fprintf(stderr, "do_sigreturn: not implemented\n");
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return -TARGET_ENOSYS;
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}
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long do_rt_sigreturn(CPUNios2State *env)
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{
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/* Verify, can we follow the stack back */
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abi_ulong frame_addr = env->regs[R_SP];
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struct target_rt_sigframe *frame;
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sigset_t set;
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int rval;
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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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do_sigprocmask(SIG_SETMASK, &set, NULL);
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if (rt_restore_ucontext(env, &frame->uc, &rval)) {
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goto badframe;
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}
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unlock_user_struct(frame, frame_addr, 0);
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return rval;
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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 0;
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}
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