410 lines
11 KiB
C
410 lines
11 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_ulong sc_mask;
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abi_ulong sc_usp;
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abi_ulong sc_d0;
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abi_ulong sc_d1;
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abi_ulong sc_a0;
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abi_ulong sc_a1;
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unsigned short sc_sr;
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abi_ulong sc_pc;
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};
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struct target_sigframe
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{
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abi_ulong pretcode;
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int sig;
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int code;
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abi_ulong psc;
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abi_ulong extramask[TARGET_NSIG_WORDS-1];
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struct target_sigcontext sc;
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};
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typedef int target_greg_t;
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#define TARGET_NGREG 18
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typedef target_greg_t target_gregset_t[TARGET_NGREG];
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typedef struct target_fpregset {
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int f_fpcntl[3];
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int f_fpregs[8*3];
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} target_fpregset_t;
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struct target_mcontext {
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int version;
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target_gregset_t gregs;
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target_fpregset_t fpregs;
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};
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#define TARGET_MCONTEXT_VERSION 2
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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_mcontext tuc_mcontext;
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abi_long tuc_filler[80];
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target_sigset_t tuc_sigmask;
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};
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struct target_rt_sigframe
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{
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abi_ulong pretcode;
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int sig;
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abi_ulong pinfo;
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abi_ulong puc;
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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 void setup_sigcontext(struct target_sigcontext *sc, CPUM68KState *env,
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abi_ulong mask)
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{
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uint32_t sr = (env->sr & 0xff00) | cpu_m68k_get_ccr(env);
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__put_user(mask, &sc->sc_mask);
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__put_user(env->aregs[7], &sc->sc_usp);
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__put_user(env->dregs[0], &sc->sc_d0);
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__put_user(env->dregs[1], &sc->sc_d1);
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__put_user(env->aregs[0], &sc->sc_a0);
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__put_user(env->aregs[1], &sc->sc_a1);
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__put_user(sr, &sc->sc_sr);
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__put_user(env->pc, &sc->sc_pc);
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}
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static void
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restore_sigcontext(CPUM68KState *env, struct target_sigcontext *sc)
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{
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int temp;
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__get_user(env->aregs[7], &sc->sc_usp);
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__get_user(env->dregs[0], &sc->sc_d0);
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__get_user(env->dregs[1], &sc->sc_d1);
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__get_user(env->aregs[0], &sc->sc_a0);
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__get_user(env->aregs[1], &sc->sc_a1);
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__get_user(env->pc, &sc->sc_pc);
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__get_user(temp, &sc->sc_sr);
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cpu_m68k_set_ccr(env, temp);
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}
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/*
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* Determine which stack to use..
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*/
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static inline abi_ulong
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get_sigframe(struct target_sigaction *ka, CPUM68KState *regs,
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size_t frame_size)
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{
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abi_ulong sp;
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sp = target_sigsp(get_sp_from_cpustate(regs), ka);
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return ((sp - frame_size) & -8UL);
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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, CPUM68KState *env)
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{
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struct target_sigframe *frame;
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abi_ulong frame_addr;
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abi_ulong sc_addr;
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int i;
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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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__put_user(sig, &frame->sig);
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sc_addr = frame_addr + offsetof(struct target_sigframe, sc);
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__put_user(sc_addr, &frame->psc);
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setup_sigcontext(&frame->sc, env, set->sig[0]);
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for(i = 1; i < TARGET_NSIG_WORDS; i++) {
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__put_user(set->sig[i], &frame->extramask[i - 1]);
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}
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/* Set up to return from userspace. */
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__put_user(default_sigreturn, &frame->pretcode);
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env->aregs[7] = frame_addr;
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env->pc = ka->_sa_handler;
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unlock_user_struct(frame, frame_addr, 1);
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return;
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give_sigsegv:
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force_sigsegv(sig);
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}
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static inline void target_rt_save_fpu_state(struct target_ucontext *uc,
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CPUM68KState *env)
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{
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int i;
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target_fpregset_t *fpregs = &uc->tuc_mcontext.fpregs;
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__put_user(env->fpcr, &fpregs->f_fpcntl[0]);
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__put_user(env->fpsr, &fpregs->f_fpcntl[1]);
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/* fpiar is not emulated */
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for (i = 0; i < 8; i++) {
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uint32_t high = env->fregs[i].d.high << 16;
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__put_user(high, &fpregs->f_fpregs[i * 3]);
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__put_user(env->fregs[i].d.low,
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(uint64_t *)&fpregs->f_fpregs[i * 3 + 1]);
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}
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}
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static inline int target_rt_setup_ucontext(struct target_ucontext *uc,
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CPUM68KState *env)
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{
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target_greg_t *gregs = uc->tuc_mcontext.gregs;
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uint32_t sr = (env->sr & 0xff00) | cpu_m68k_get_ccr(env);
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__put_user(TARGET_MCONTEXT_VERSION, &uc->tuc_mcontext.version);
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__put_user(env->dregs[0], &gregs[0]);
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__put_user(env->dregs[1], &gregs[1]);
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__put_user(env->dregs[2], &gregs[2]);
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__put_user(env->dregs[3], &gregs[3]);
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__put_user(env->dregs[4], &gregs[4]);
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__put_user(env->dregs[5], &gregs[5]);
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__put_user(env->dregs[6], &gregs[6]);
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__put_user(env->dregs[7], &gregs[7]);
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__put_user(env->aregs[0], &gregs[8]);
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__put_user(env->aregs[1], &gregs[9]);
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__put_user(env->aregs[2], &gregs[10]);
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__put_user(env->aregs[3], &gregs[11]);
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__put_user(env->aregs[4], &gregs[12]);
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__put_user(env->aregs[5], &gregs[13]);
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__put_user(env->aregs[6], &gregs[14]);
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__put_user(env->aregs[7], &gregs[15]);
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__put_user(env->pc, &gregs[16]);
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__put_user(sr, &gregs[17]);
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target_rt_save_fpu_state(uc, env);
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return 0;
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}
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static inline void target_rt_restore_fpu_state(CPUM68KState *env,
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struct target_ucontext *uc)
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{
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int i;
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target_fpregset_t *fpregs = &uc->tuc_mcontext.fpregs;
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uint32_t fpcr;
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__get_user(fpcr, &fpregs->f_fpcntl[0]);
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cpu_m68k_set_fpcr(env, fpcr);
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__get_user(env->fpsr, &fpregs->f_fpcntl[1]);
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/* fpiar is not emulated */
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for (i = 0; i < 8; i++) {
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uint32_t high;
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__get_user(high, &fpregs->f_fpregs[i * 3]);
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env->fregs[i].d.high = high >> 16;
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__get_user(env->fregs[i].d.low,
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(uint64_t *)&fpregs->f_fpregs[i * 3 + 1]);
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}
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}
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static inline int target_rt_restore_ucontext(CPUM68KState *env,
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struct target_ucontext *uc)
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{
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int temp;
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target_greg_t *gregs = uc->tuc_mcontext.gregs;
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__get_user(temp, &uc->tuc_mcontext.version);
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if (temp != TARGET_MCONTEXT_VERSION)
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goto badframe;
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/* restore passed registers */
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__get_user(env->dregs[0], &gregs[0]);
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__get_user(env->dregs[1], &gregs[1]);
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__get_user(env->dregs[2], &gregs[2]);
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__get_user(env->dregs[3], &gregs[3]);
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__get_user(env->dregs[4], &gregs[4]);
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__get_user(env->dregs[5], &gregs[5]);
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__get_user(env->dregs[6], &gregs[6]);
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__get_user(env->dregs[7], &gregs[7]);
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__get_user(env->aregs[0], &gregs[8]);
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__get_user(env->aregs[1], &gregs[9]);
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__get_user(env->aregs[2], &gregs[10]);
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__get_user(env->aregs[3], &gregs[11]);
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__get_user(env->aregs[4], &gregs[12]);
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__get_user(env->aregs[5], &gregs[13]);
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__get_user(env->aregs[6], &gregs[14]);
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__get_user(env->aregs[7], &gregs[15]);
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__get_user(env->pc, &gregs[16]);
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__get_user(temp, &gregs[17]);
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cpu_m68k_set_ccr(env, temp);
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target_rt_restore_fpu_state(env, uc);
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return 0;
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badframe:
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return 1;
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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, CPUM68KState *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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abi_ulong info_addr;
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abi_ulong uc_addr;
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int err = 0;
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int i;
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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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__put_user(sig, &frame->sig);
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info_addr = frame_addr + offsetof(struct target_rt_sigframe, info);
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__put_user(info_addr, &frame->pinfo);
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uc_addr = frame_addr + offsetof(struct target_rt_sigframe, uc);
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__put_user(uc_addr, &frame->puc);
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tswap_siginfo(&frame->info, info);
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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 |= target_rt_setup_ucontext(&frame->uc, env);
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if (err)
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goto give_sigsegv;
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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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/* Set up to return from userspace. */
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__put_user(default_rt_sigreturn, &frame->pretcode);
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env->aregs[7] = frame_addr;
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env->pc = ka->_sa_handler;
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unlock_user_struct(frame, frame_addr, 1);
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return;
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give_sigsegv:
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unlock_user_struct(frame, frame_addr, 1);
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force_sigsegv(sig);
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}
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long do_sigreturn(CPUM68KState *env)
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{
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struct target_sigframe *frame;
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abi_ulong frame_addr = env->aregs[7] - 4;
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target_sigset_t target_set;
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sigset_t set;
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int i;
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trace_user_do_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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/* set blocked signals */
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__get_user(target_set.sig[0], &frame->sc.sc_mask);
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for(i = 1; i < TARGET_NSIG_WORDS; i++) {
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__get_user(target_set.sig[i], &frame->extramask[i - 1]);
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}
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target_to_host_sigset_internal(&set, &target_set);
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set_sigmask(&set);
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/* restore registers */
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restore_sigcontext(env, &frame->sc);
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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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force_sig(TARGET_SIGSEGV);
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return -QEMU_ESIGRETURN;
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}
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long do_rt_sigreturn(CPUM68KState *env)
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{
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struct target_rt_sigframe *frame;
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abi_ulong frame_addr = env->aregs[7] - 4;
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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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target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
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set_sigmask(&set);
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/* restore registers */
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if (target_rt_restore_ucontext(env, &frame->uc))
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goto badframe;
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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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void *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 4 + 6, 0);
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assert(tramp != NULL);
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default_sigreturn = sigtramp_page;
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/* moveq #,d0; trap #0 */
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__put_user(0x70004e40 + (TARGET_NR_sigreturn << 16), (uint32_t *)tramp);
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default_rt_sigreturn = sigtramp_page + 4;
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/* moveq #,d0; notb d0; trap #0 */
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__put_user(0x70004600 + ((TARGET_NR_rt_sigreturn ^ 0xff) << 16),
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(uint32_t *)(tramp + 4));
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__put_user(0x4e40, (uint16_t *)(tramp + 8));
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unlock_user(tramp, sigtramp_page, 4 + 6);
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}
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