2018-04-25 03:26:16 +08:00
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/*
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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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2018-04-25 03:26:31 +08:00
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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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/* from the Linux kernel - /arch/x86/include/uapi/asm/sigcontext.h */
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struct target_fpreg {
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uint16_t significand[4];
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uint16_t exponent;
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};
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struct target_fpxreg {
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uint16_t significand[4];
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uint16_t exponent;
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uint16_t padding[3];
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};
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struct target_xmmreg {
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uint32_t element[4];
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};
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struct target_fpstate_32 {
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/* Regular FPU environment */
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uint32_t cw;
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uint32_t sw;
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uint32_t tag;
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uint32_t ipoff;
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uint32_t cssel;
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uint32_t dataoff;
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uint32_t datasel;
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struct target_fpreg st[8];
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uint16_t status;
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uint16_t magic; /* 0xffff = regular FPU data only */
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/* FXSR FPU environment */
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uint32_t _fxsr_env[6]; /* FXSR FPU env is ignored */
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uint32_t mxcsr;
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uint32_t reserved;
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struct target_fpxreg fxsr_st[8]; /* FXSR FPU reg data is ignored */
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struct target_xmmreg xmm[8];
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uint32_t padding[56];
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};
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struct target_fpstate_64 {
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/* FXSAVE format */
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uint16_t cw;
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uint16_t sw;
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uint16_t twd;
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uint16_t fop;
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uint64_t rip;
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uint64_t rdp;
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uint32_t mxcsr;
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uint32_t mxcsr_mask;
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uint32_t st_space[32];
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uint32_t xmm_space[64];
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uint32_t reserved[24];
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};
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#ifndef TARGET_X86_64
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# define target_fpstate target_fpstate_32
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#else
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# define target_fpstate target_fpstate_64
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#endif
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struct target_sigcontext_32 {
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uint16_t gs, __gsh;
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uint16_t fs, __fsh;
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uint16_t es, __esh;
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uint16_t ds, __dsh;
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uint32_t edi;
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uint32_t esi;
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uint32_t ebp;
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uint32_t esp;
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uint32_t ebx;
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uint32_t edx;
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uint32_t ecx;
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uint32_t eax;
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uint32_t trapno;
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uint32_t err;
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uint32_t eip;
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uint16_t cs, __csh;
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uint32_t eflags;
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uint32_t esp_at_signal;
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uint16_t ss, __ssh;
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uint32_t fpstate; /* pointer */
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uint32_t oldmask;
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uint32_t cr2;
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};
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struct target_sigcontext_64 {
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uint64_t r8;
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uint64_t r9;
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uint64_t r10;
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uint64_t r11;
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uint64_t r12;
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uint64_t r13;
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uint64_t r14;
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uint64_t r15;
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uint64_t rdi;
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uint64_t rsi;
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uint64_t rbp;
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uint64_t rbx;
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uint64_t rdx;
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uint64_t rax;
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uint64_t rcx;
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uint64_t rsp;
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uint64_t rip;
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uint64_t eflags;
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uint16_t cs;
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uint16_t gs;
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uint16_t fs;
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uint16_t ss;
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uint64_t err;
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uint64_t trapno;
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uint64_t oldmask;
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uint64_t cr2;
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uint64_t fpstate; /* pointer */
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uint64_t padding[8];
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};
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#ifndef TARGET_X86_64
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# define target_sigcontext target_sigcontext_32
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#else
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# define target_sigcontext target_sigcontext_64
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#endif
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/* see Linux/include/uapi/asm-generic/ucontext.h */
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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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#ifndef TARGET_X86_64
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struct sigframe {
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abi_ulong pretcode;
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int sig;
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struct target_sigcontext sc;
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struct target_fpstate fpstate;
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abi_ulong extramask[TARGET_NSIG_WORDS-1];
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char retcode[8];
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};
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struct rt_sigframe {
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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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struct target_fpstate fpstate;
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char retcode[8];
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};
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#else
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struct rt_sigframe {
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abi_ulong pretcode;
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struct target_ucontext uc;
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struct target_siginfo info;
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struct target_fpstate fpstate;
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};
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#endif
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/*
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* Set up a signal frame.
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*/
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/* XXX: save x87 state */
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static void setup_sigcontext(struct target_sigcontext *sc,
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struct target_fpstate *fpstate, CPUX86State *env, abi_ulong mask,
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abi_ulong fpstate_addr)
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{
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CPUState *cs = CPU(x86_env_get_cpu(env));
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#ifndef TARGET_X86_64
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uint16_t magic;
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/* already locked in setup_frame() */
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__put_user(env->segs[R_GS].selector, (unsigned int *)&sc->gs);
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__put_user(env->segs[R_FS].selector, (unsigned int *)&sc->fs);
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__put_user(env->segs[R_ES].selector, (unsigned int *)&sc->es);
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__put_user(env->segs[R_DS].selector, (unsigned int *)&sc->ds);
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__put_user(env->regs[R_EDI], &sc->edi);
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__put_user(env->regs[R_ESI], &sc->esi);
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__put_user(env->regs[R_EBP], &sc->ebp);
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__put_user(env->regs[R_ESP], &sc->esp);
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__put_user(env->regs[R_EBX], &sc->ebx);
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__put_user(env->regs[R_EDX], &sc->edx);
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__put_user(env->regs[R_ECX], &sc->ecx);
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__put_user(env->regs[R_EAX], &sc->eax);
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__put_user(cs->exception_index, &sc->trapno);
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__put_user(env->error_code, &sc->err);
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__put_user(env->eip, &sc->eip);
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__put_user(env->segs[R_CS].selector, (unsigned int *)&sc->cs);
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__put_user(env->eflags, &sc->eflags);
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__put_user(env->regs[R_ESP], &sc->esp_at_signal);
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__put_user(env->segs[R_SS].selector, (unsigned int *)&sc->ss);
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cpu_x86_fsave(env, fpstate_addr, 1);
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fpstate->status = fpstate->sw;
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magic = 0xffff;
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__put_user(magic, &fpstate->magic);
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__put_user(fpstate_addr, &sc->fpstate);
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/* non-iBCS2 extensions.. */
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__put_user(mask, &sc->oldmask);
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__put_user(env->cr[2], &sc->cr2);
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#else
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__put_user(env->regs[R_EDI], &sc->rdi);
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__put_user(env->regs[R_ESI], &sc->rsi);
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__put_user(env->regs[R_EBP], &sc->rbp);
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__put_user(env->regs[R_ESP], &sc->rsp);
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__put_user(env->regs[R_EBX], &sc->rbx);
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__put_user(env->regs[R_EDX], &sc->rdx);
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__put_user(env->regs[R_ECX], &sc->rcx);
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__put_user(env->regs[R_EAX], &sc->rax);
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__put_user(env->regs[8], &sc->r8);
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__put_user(env->regs[9], &sc->r9);
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__put_user(env->regs[10], &sc->r10);
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__put_user(env->regs[11], &sc->r11);
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__put_user(env->regs[12], &sc->r12);
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__put_user(env->regs[13], &sc->r13);
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__put_user(env->regs[14], &sc->r14);
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__put_user(env->regs[15], &sc->r15);
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__put_user(cs->exception_index, &sc->trapno);
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__put_user(env->error_code, &sc->err);
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__put_user(env->eip, &sc->rip);
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__put_user(env->eflags, &sc->eflags);
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__put_user(env->segs[R_CS].selector, &sc->cs);
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__put_user((uint16_t)0, &sc->gs);
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__put_user((uint16_t)0, &sc->fs);
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__put_user(env->segs[R_SS].selector, &sc->ss);
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__put_user(mask, &sc->oldmask);
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__put_user(env->cr[2], &sc->cr2);
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/* fpstate_addr must be 16 byte aligned for fxsave */
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assert(!(fpstate_addr & 0xf));
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cpu_x86_fxsave(env, fpstate_addr);
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__put_user(fpstate_addr, &sc->fpstate);
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#endif
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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, CPUX86State *env, size_t frame_size)
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{
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unsigned long esp;
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/* Default to using normal stack */
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2018-04-12 03:23:47 +08:00
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esp = get_sp_from_cpustate(env);
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2018-04-25 03:26:31 +08:00
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#ifdef TARGET_X86_64
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esp -= 128; /* this is the redzone */
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#endif
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/* This is the X/Open sanctioned signal stack switching. */
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if (ka->sa_flags & TARGET_SA_ONSTACK) {
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2018-04-12 03:23:47 +08:00
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esp = target_sigsp(esp, ka);
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2018-04-25 03:26:31 +08:00
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} else {
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#ifndef TARGET_X86_64
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/* This is the legacy signal stack switching. */
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if ((env->segs[R_SS].selector & 0xffff) != __USER_DS &&
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!(ka->sa_flags & TARGET_SA_RESTORER) &&
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ka->sa_restorer) {
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esp = (unsigned long) ka->sa_restorer;
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}
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#endif
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}
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#ifndef TARGET_X86_64
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return (esp - frame_size) & -8ul;
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#else
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return ((esp - frame_size) & (~15ul)) - 8;
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#endif
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}
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#ifndef TARGET_X86_64
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/* compare linux/arch/i386/kernel/signal.c:setup_frame() */
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void setup_frame(int sig, struct target_sigaction *ka,
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target_sigset_t *set, CPUX86State *env)
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{
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abi_ulong frame_addr;
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struct sigframe *frame;
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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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__put_user(sig, &frame->sig);
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setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0],
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frame_addr + offsetof(struct sigframe, fpstate));
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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. If provided, use a stub
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already in userspace. */
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if (ka->sa_flags & TARGET_SA_RESTORER) {
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__put_user(ka->sa_restorer, &frame->pretcode);
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} else {
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uint16_t val16;
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abi_ulong retcode_addr;
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retcode_addr = frame_addr + offsetof(struct sigframe, retcode);
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__put_user(retcode_addr, &frame->pretcode);
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/* This is popl %eax ; movl $,%eax ; int $0x80 */
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val16 = 0xb858;
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__put_user(val16, (uint16_t *)(frame->retcode+0));
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__put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2));
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val16 = 0x80cd;
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__put_user(val16, (uint16_t *)(frame->retcode+6));
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}
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/* Set up registers for signal handler */
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env->regs[R_ESP] = frame_addr;
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env->eip = ka->_sa_handler;
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cpu_x86_load_seg(env, R_DS, __USER_DS);
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cpu_x86_load_seg(env, R_ES, __USER_DS);
|
|
|
|
cpu_x86_load_seg(env, R_SS, __USER_DS);
|
|
|
|
cpu_x86_load_seg(env, R_CS, __USER_CS);
|
|
|
|
env->eflags &= ~TF_MASK;
|
|
|
|
|
|
|
|
unlock_user_struct(frame, frame_addr, 1);
|
|
|
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
give_sigsegv:
|
|
|
|
force_sigsegv(sig);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* compare linux/arch/x86/kernel/signal.c:setup_rt_frame() */
|
|
|
|
void setup_rt_frame(int sig, struct target_sigaction *ka,
|
|
|
|
target_siginfo_t *info,
|
|
|
|
target_sigset_t *set, CPUX86State *env)
|
|
|
|
{
|
|
|
|
abi_ulong frame_addr;
|
|
|
|
#ifndef TARGET_X86_64
|
|
|
|
abi_ulong addr;
|
|
|
|
#endif
|
|
|
|
struct rt_sigframe *frame;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
frame_addr = get_sigframe(ka, env, sizeof(*frame));
|
|
|
|
trace_user_setup_rt_frame(env, frame_addr);
|
|
|
|
|
|
|
|
if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0))
|
|
|
|
goto give_sigsegv;
|
|
|
|
|
|
|
|
/* These fields are only in rt_sigframe on 32 bit */
|
|
|
|
#ifndef TARGET_X86_64
|
|
|
|
__put_user(sig, &frame->sig);
|
|
|
|
addr = frame_addr + offsetof(struct rt_sigframe, info);
|
|
|
|
__put_user(addr, &frame->pinfo);
|
|
|
|
addr = frame_addr + offsetof(struct rt_sigframe, uc);
|
|
|
|
__put_user(addr, &frame->puc);
|
|
|
|
#endif
|
|
|
|
if (ka->sa_flags & TARGET_SA_SIGINFO) {
|
|
|
|
tswap_siginfo(&frame->info, info);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Create the ucontext. */
|
|
|
|
__put_user(0, &frame->uc.tuc_flags);
|
|
|
|
__put_user(0, &frame->uc.tuc_link);
|
2018-04-12 03:23:47 +08:00
|
|
|
target_save_altstack(&frame->uc.tuc_stack, env);
|
2018-04-25 03:26:31 +08:00
|
|
|
setup_sigcontext(&frame->uc.tuc_mcontext, &frame->fpstate, env,
|
|
|
|
set->sig[0], frame_addr + offsetof(struct rt_sigframe, fpstate));
|
|
|
|
|
|
|
|
for(i = 0; i < TARGET_NSIG_WORDS; i++) {
|
|
|
|
__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Set up to return from userspace. If provided, use a stub
|
|
|
|
already in userspace. */
|
|
|
|
#ifndef TARGET_X86_64
|
|
|
|
if (ka->sa_flags & TARGET_SA_RESTORER) {
|
|
|
|
__put_user(ka->sa_restorer, &frame->pretcode);
|
|
|
|
} else {
|
|
|
|
uint16_t val16;
|
|
|
|
addr = frame_addr + offsetof(struct rt_sigframe, retcode);
|
|
|
|
__put_user(addr, &frame->pretcode);
|
|
|
|
/* This is movl $,%eax ; int $0x80 */
|
|
|
|
__put_user(0xb8, (char *)(frame->retcode+0));
|
|
|
|
__put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1));
|
|
|
|
val16 = 0x80cd;
|
|
|
|
__put_user(val16, (uint16_t *)(frame->retcode+5));
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
/* XXX: Would be slightly better to return -EFAULT here if test fails
|
|
|
|
assert(ka->sa_flags & TARGET_SA_RESTORER); */
|
|
|
|
__put_user(ka->sa_restorer, &frame->pretcode);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Set up registers for signal handler */
|
|
|
|
env->regs[R_ESP] = frame_addr;
|
|
|
|
env->eip = ka->_sa_handler;
|
|
|
|
|
|
|
|
#ifndef TARGET_X86_64
|
|
|
|
env->regs[R_EAX] = sig;
|
|
|
|
env->regs[R_EDX] = (unsigned long)&frame->info;
|
|
|
|
env->regs[R_ECX] = (unsigned long)&frame->uc;
|
|
|
|
#else
|
|
|
|
env->regs[R_EAX] = 0;
|
|
|
|
env->regs[R_EDI] = sig;
|
|
|
|
env->regs[R_ESI] = (unsigned long)&frame->info;
|
|
|
|
env->regs[R_EDX] = (unsigned long)&frame->uc;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
cpu_x86_load_seg(env, R_DS, __USER_DS);
|
|
|
|
cpu_x86_load_seg(env, R_ES, __USER_DS);
|
|
|
|
cpu_x86_load_seg(env, R_CS, __USER_CS);
|
|
|
|
cpu_x86_load_seg(env, R_SS, __USER_DS);
|
|
|
|
env->eflags &= ~TF_MASK;
|
|
|
|
|
|
|
|
unlock_user_struct(frame, frame_addr, 1);
|
|
|
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
give_sigsegv:
|
|
|
|
force_sigsegv(sig);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc)
|
|
|
|
{
|
|
|
|
unsigned int err = 0;
|
|
|
|
abi_ulong fpstate_addr;
|
|
|
|
unsigned int tmpflags;
|
|
|
|
|
|
|
|
#ifndef TARGET_X86_64
|
|
|
|
cpu_x86_load_seg(env, R_GS, tswap16(sc->gs));
|
|
|
|
cpu_x86_load_seg(env, R_FS, tswap16(sc->fs));
|
|
|
|
cpu_x86_load_seg(env, R_ES, tswap16(sc->es));
|
|
|
|
cpu_x86_load_seg(env, R_DS, tswap16(sc->ds));
|
|
|
|
|
|
|
|
env->regs[R_EDI] = tswapl(sc->edi);
|
|
|
|
env->regs[R_ESI] = tswapl(sc->esi);
|
|
|
|
env->regs[R_EBP] = tswapl(sc->ebp);
|
|
|
|
env->regs[R_ESP] = tswapl(sc->esp);
|
|
|
|
env->regs[R_EBX] = tswapl(sc->ebx);
|
|
|
|
env->regs[R_EDX] = tswapl(sc->edx);
|
|
|
|
env->regs[R_ECX] = tswapl(sc->ecx);
|
|
|
|
env->regs[R_EAX] = tswapl(sc->eax);
|
|
|
|
|
|
|
|
env->eip = tswapl(sc->eip);
|
|
|
|
#else
|
|
|
|
env->regs[8] = tswapl(sc->r8);
|
|
|
|
env->regs[9] = tswapl(sc->r9);
|
|
|
|
env->regs[10] = tswapl(sc->r10);
|
|
|
|
env->regs[11] = tswapl(sc->r11);
|
|
|
|
env->regs[12] = tswapl(sc->r12);
|
|
|
|
env->regs[13] = tswapl(sc->r13);
|
|
|
|
env->regs[14] = tswapl(sc->r14);
|
|
|
|
env->regs[15] = tswapl(sc->r15);
|
|
|
|
|
|
|
|
env->regs[R_EDI] = tswapl(sc->rdi);
|
|
|
|
env->regs[R_ESI] = tswapl(sc->rsi);
|
|
|
|
env->regs[R_EBP] = tswapl(sc->rbp);
|
|
|
|
env->regs[R_EBX] = tswapl(sc->rbx);
|
|
|
|
env->regs[R_EDX] = tswapl(sc->rdx);
|
|
|
|
env->regs[R_EAX] = tswapl(sc->rax);
|
|
|
|
env->regs[R_ECX] = tswapl(sc->rcx);
|
|
|
|
env->regs[R_ESP] = tswapl(sc->rsp);
|
|
|
|
|
|
|
|
env->eip = tswapl(sc->rip);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
cpu_x86_load_seg(env, R_CS, lduw_p(&sc->cs) | 3);
|
|
|
|
cpu_x86_load_seg(env, R_SS, lduw_p(&sc->ss) | 3);
|
|
|
|
|
|
|
|
tmpflags = tswapl(sc->eflags);
|
|
|
|
env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
|
|
|
|
// regs->orig_eax = -1; /* disable syscall checks */
|
|
|
|
|
|
|
|
fpstate_addr = tswapl(sc->fpstate);
|
|
|
|
if (fpstate_addr != 0) {
|
|
|
|
if (!access_ok(VERIFY_READ, fpstate_addr,
|
|
|
|
sizeof(struct target_fpstate)))
|
|
|
|
goto badframe;
|
|
|
|
#ifndef TARGET_X86_64
|
|
|
|
cpu_x86_frstor(env, fpstate_addr, 1);
|
|
|
|
#else
|
|
|
|
cpu_x86_fxrstor(env, fpstate_addr);
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
return err;
|
|
|
|
badframe:
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Note: there is no sigreturn on x86_64, there is only rt_sigreturn */
|
|
|
|
#ifndef TARGET_X86_64
|
|
|
|
long do_sigreturn(CPUX86State *env)
|
|
|
|
{
|
|
|
|
struct sigframe *frame;
|
|
|
|
abi_ulong frame_addr = env->regs[R_ESP] - 8;
|
|
|
|
target_sigset_t target_set;
|
|
|
|
sigset_t set;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
trace_user_do_sigreturn(env, frame_addr);
|
|
|
|
if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1))
|
|
|
|
goto badframe;
|
|
|
|
/* set blocked signals */
|
|
|
|
__get_user(target_set.sig[0], &frame->sc.oldmask);
|
|
|
|
for(i = 1; i < TARGET_NSIG_WORDS; i++) {
|
|
|
|
__get_user(target_set.sig[i], &frame->extramask[i - 1]);
|
|
|
|
}
|
|
|
|
|
|
|
|
target_to_host_sigset_internal(&set, &target_set);
|
|
|
|
set_sigmask(&set);
|
|
|
|
|
|
|
|
/* restore registers */
|
|
|
|
if (restore_sigcontext(env, &frame->sc))
|
|
|
|
goto badframe;
|
|
|
|
unlock_user_struct(frame, frame_addr, 0);
|
|
|
|
return -TARGET_QEMU_ESIGRETURN;
|
|
|
|
|
|
|
|
badframe:
|
|
|
|
unlock_user_struct(frame, frame_addr, 0);
|
|
|
|
force_sig(TARGET_SIGSEGV);
|
|
|
|
return -TARGET_QEMU_ESIGRETURN;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
long do_rt_sigreturn(CPUX86State *env)
|
|
|
|
{
|
|
|
|
abi_ulong frame_addr;
|
|
|
|
struct rt_sigframe *frame;
|
|
|
|
sigset_t set;
|
|
|
|
|
|
|
|
frame_addr = env->regs[R_ESP] - sizeof(abi_ulong);
|
|
|
|
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);
|
|
|
|
|
|
|
|
if (restore_sigcontext(env, &frame->uc.tuc_mcontext)) {
|
|
|
|
goto badframe;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (do_sigaltstack(frame_addr + offsetof(struct rt_sigframe, uc.tuc_stack), 0,
|
|
|
|
get_sp_from_cpustate(env)) == -EFAULT) {
|
|
|
|
goto badframe;
|
|
|
|
}
|
|
|
|
|
|
|
|
unlock_user_struct(frame, frame_addr, 0);
|
|
|
|
return -TARGET_QEMU_ESIGRETURN;
|
|
|
|
|
|
|
|
badframe:
|
|
|
|
unlock_user_struct(frame, frame_addr, 0);
|
|
|
|
force_sig(TARGET_SIGSEGV);
|
|
|
|
return -TARGET_QEMU_ESIGRETURN;
|
|
|
|
}
|