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233 lines
7.2 KiB
C
233 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 "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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struct target_pt_regs regs; /* needs to be first */
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uint32_t oldmask;
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};
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struct target_stack_t {
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abi_ulong ss_sp;
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int ss_flags;
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unsigned int ss_size;
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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;
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};
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/* Signal frames. */
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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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uint32_t tramp[2];
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};
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static void setup_sigcontext(struct target_sigcontext *sc, CPUMBState *env)
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{
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__put_user(env->regs[0], &sc->regs.r0);
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__put_user(env->regs[1], &sc->regs.r1);
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__put_user(env->regs[2], &sc->regs.r2);
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__put_user(env->regs[3], &sc->regs.r3);
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__put_user(env->regs[4], &sc->regs.r4);
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__put_user(env->regs[5], &sc->regs.r5);
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__put_user(env->regs[6], &sc->regs.r6);
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__put_user(env->regs[7], &sc->regs.r7);
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__put_user(env->regs[8], &sc->regs.r8);
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__put_user(env->regs[9], &sc->regs.r9);
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__put_user(env->regs[10], &sc->regs.r10);
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__put_user(env->regs[11], &sc->regs.r11);
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__put_user(env->regs[12], &sc->regs.r12);
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__put_user(env->regs[13], &sc->regs.r13);
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__put_user(env->regs[14], &sc->regs.r14);
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__put_user(env->regs[15], &sc->regs.r15);
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__put_user(env->regs[16], &sc->regs.r16);
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__put_user(env->regs[17], &sc->regs.r17);
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__put_user(env->regs[18], &sc->regs.r18);
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__put_user(env->regs[19], &sc->regs.r19);
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__put_user(env->regs[20], &sc->regs.r20);
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__put_user(env->regs[21], &sc->regs.r21);
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__put_user(env->regs[22], &sc->regs.r22);
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__put_user(env->regs[23], &sc->regs.r23);
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__put_user(env->regs[24], &sc->regs.r24);
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__put_user(env->regs[25], &sc->regs.r25);
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__put_user(env->regs[26], &sc->regs.r26);
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__put_user(env->regs[27], &sc->regs.r27);
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__put_user(env->regs[28], &sc->regs.r28);
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__put_user(env->regs[29], &sc->regs.r29);
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__put_user(env->regs[30], &sc->regs.r30);
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__put_user(env->regs[31], &sc->regs.r31);
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__put_user(env->pc, &sc->regs.pc);
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}
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static void restore_sigcontext(struct target_sigcontext *sc, CPUMBState *env)
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{
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__get_user(env->regs[0], &sc->regs.r0);
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__get_user(env->regs[1], &sc->regs.r1);
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__get_user(env->regs[2], &sc->regs.r2);
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__get_user(env->regs[3], &sc->regs.r3);
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__get_user(env->regs[4], &sc->regs.r4);
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__get_user(env->regs[5], &sc->regs.r5);
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__get_user(env->regs[6], &sc->regs.r6);
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__get_user(env->regs[7], &sc->regs.r7);
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__get_user(env->regs[8], &sc->regs.r8);
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__get_user(env->regs[9], &sc->regs.r9);
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__get_user(env->regs[10], &sc->regs.r10);
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__get_user(env->regs[11], &sc->regs.r11);
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__get_user(env->regs[12], &sc->regs.r12);
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__get_user(env->regs[13], &sc->regs.r13);
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__get_user(env->regs[14], &sc->regs.r14);
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__get_user(env->regs[15], &sc->regs.r15);
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__get_user(env->regs[16], &sc->regs.r16);
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__get_user(env->regs[17], &sc->regs.r17);
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__get_user(env->regs[18], &sc->regs.r18);
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__get_user(env->regs[19], &sc->regs.r19);
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__get_user(env->regs[20], &sc->regs.r20);
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__get_user(env->regs[21], &sc->regs.r21);
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__get_user(env->regs[22], &sc->regs.r22);
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__get_user(env->regs[23], &sc->regs.r23);
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__get_user(env->regs[24], &sc->regs.r24);
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__get_user(env->regs[25], &sc->regs.r25);
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__get_user(env->regs[26], &sc->regs.r26);
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__get_user(env->regs[27], &sc->regs.r27);
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__get_user(env->regs[28], &sc->regs.r28);
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__get_user(env->regs[29], &sc->regs.r29);
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__get_user(env->regs[30], &sc->regs.r30);
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__get_user(env->regs[31], &sc->regs.r31);
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__get_user(env->pc, &sc->regs.pc);
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}
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static abi_ulong get_sigframe(struct target_sigaction *ka,
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CPUMBState *env, int frame_size)
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{
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abi_ulong sp = env->regs[1];
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sp = target_sigsp(sp, ka);
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return ((sp - 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, CPUMBState *env)
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{
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struct target_rt_sigframe *frame;
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abi_ulong frame_addr;
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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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force_sigsegv(sig);
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return;
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}
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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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target_save_altstack(&frame->uc.tuc_stack, env);
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setup_sigcontext(&frame->uc.tuc_mcontext, env);
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for (int 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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/* Kernel does not use SA_RESTORER. */
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/*
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* Return from sighandler will jump to the tramp.
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* Negative 8 offset because return is rtsd r15, 8
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*/
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env->regs[15] = default_rt_sigreturn - 8;
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/* Set up registers for signal handler */
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env->regs[1] = frame_addr;
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/* Signal handler args: */
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env->regs[5] = sig;
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env->regs[6] = frame_addr + offsetof(struct target_rt_sigframe, info);
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env->regs[7] = frame_addr + offsetof(struct target_rt_sigframe, uc);
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/* Offset to handle microblaze rtid r14, 0 */
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env->pc = (unsigned long)ka->_sa_handler;
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unlock_user_struct(frame, frame_addr, 1);
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}
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long do_sigreturn(CPUMBState *env)
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{
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return -TARGET_ENOSYS;
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}
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long do_rt_sigreturn(CPUMBState *env)
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{
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struct target_rt_sigframe *frame = NULL;
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abi_ulong frame_addr = env->regs[1];
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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(&frame->uc.tuc_mcontext, env);
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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, 8, 0);
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assert(tramp != NULL);
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/*
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* addi r12, r0, __NR_rt_sigreturn
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* brki r14, 0x8
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*/
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__put_user(0x31800000U | TARGET_NR_rt_sigreturn, tramp);
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__put_user(0xb9cc0008U, tramp + 1);
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default_rt_sigreturn = sigtramp_page;
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unlock_user(tramp, sigtramp_page, 8);
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}
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