[qemu.git] / user-exec.c

/*
 *  User emulator execution
 *
 *  Copyright (c) 2003-2005 Fabrice Bellard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */
#include "config.h"
#include "cpu.h"
#include "dyngen-exec.h"
#include "disas.h"
#include "tcg.h"

#undef EAX
#undef ECX
#undef EDX
#undef EBX
#undef ESP
#undef EBP
#undef ESI
#undef EDI
#undef EIP
#include <signal.h>
#ifdef __linux__
#include <sys/ucontext.h>
#endif

//#define DEBUG_SIGNAL

static void exception_action(CPUArchState *env1)
{
#if defined(TARGET_I386)
    raise_exception_err_env(env1, env1->exception_index, env1->error_code);
#else
    cpu_loop_exit(env1);
#endif
}

/* exit the current TB from a signal handler. The host registers are
   restored in a state compatible with the CPU emulator
 */
void cpu_resume_from_signal(CPUArchState *env1, void *puc)
{
#ifdef __linux__
    struct ucontext *uc = puc;
#elif defined(__OpenBSD__)
    struct sigcontext *uc = puc;
#endif

    env = env1;

    /* XXX: restore cpu registers saved in host registers */

    if (puc) {
        /* XXX: use siglongjmp ? */
#ifdef __linux__
#ifdef __ia64
        sigprocmask(SIG_SETMASK, (sigset_t *)&uc->uc_sigmask, NULL);
#else
        sigprocmask(SIG_SETMASK, &uc->uc_sigmask, NULL);
#endif
#elif defined(__OpenBSD__)
        sigprocmask(SIG_SETMASK, &uc->sc_mask, NULL);
#endif
    }
    env->exception_index = -1;
    longjmp(env->jmp_env, 1);
}

/* 'pc' is the host PC at which the exception was raised. 'address' is
   the effective address of the memory exception. 'is_write' is 1 if a
   write caused the exception and otherwise 0'. 'old_set' is the
   signal set which should be restored */
static inline int handle_cpu_signal(uintptr_t pc, unsigned long address,
                                    int is_write, sigset_t *old_set,
                                    void *puc)
{
    TranslationBlock *tb;
    int ret;

    if (cpu_single_env) {
        env = cpu_single_env; /* XXX: find a correct solution for multithread */
    }
#if defined(DEBUG_SIGNAL)
    qemu_printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
                pc, address, is_write, *(unsigned long *)old_set);
#endif
    /* XXX: locking issue */
    if (is_write && h2g_valid(address)
        && page_unprotect(h2g(address), pc, puc)) {
        return 1;
    }

    /* see if it is an MMU fault */
    ret = cpu_handle_mmu_fault(env, address, is_write, MMU_USER_IDX);
    if (ret < 0) {
        return 0; /* not an MMU fault */
    }
    if (ret == 0) {
        return 1; /* the MMU fault was handled without causing real CPU fault */
    }
    /* now we have a real cpu fault */
    tb = tb_find_pc(pc);
    if (tb) {
        /* the PC is inside the translated code. It means that we have
           a virtual CPU fault */
        cpu_restore_state(tb, env, pc);
    }

    /* we restore the process signal mask as the sigreturn should
       do it (XXX: use sigsetjmp) */
    sigprocmask(SIG_SETMASK, old_set, NULL);
    exception_action(env);

    /* never comes here */
    return 1;
}

#if defined(__i386__)

#if defined(__APPLE__)
#include <sys/ucontext.h>

#define EIP_sig(context)  (*((unsigned long *)&(context)->uc_mcontext->ss.eip))
#define TRAP_sig(context)    ((context)->uc_mcontext->es.trapno)
#define ERROR_sig(context)   ((context)->uc_mcontext->es.err)
#define MASK_sig(context)    ((context)->uc_sigmask)
#elif defined(__NetBSD__)
#include <ucontext.h>

#define EIP_sig(context)     ((context)->uc_mcontext.__gregs[_REG_EIP])
#define TRAP_sig(context)    ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
#define ERROR_sig(context)   ((context)->uc_mcontext.__gregs[_REG_ERR])
#define MASK_sig(context)    ((context)->uc_sigmask)
#elif defined(__FreeBSD__) || defined(__DragonFly__)
#include <ucontext.h>

#define EIP_sig(context)  (*((unsigned long *)&(context)->uc_mcontext.mc_eip))
#define TRAP_sig(context)    ((context)->uc_mcontext.mc_trapno)
#define ERROR_sig(context)   ((context)->uc_mcontext.mc_err)
#define MASK_sig(context)    ((context)->uc_sigmask)
#elif defined(__OpenBSD__)
#define EIP_sig(context)     ((context)->sc_eip)
#define TRAP_sig(context)    ((context)->sc_trapno)
#define ERROR_sig(context)   ((context)->sc_err)
#define MASK_sig(context)    ((context)->sc_mask)
#else
#define EIP_sig(context)     ((context)->uc_mcontext.gregs[REG_EIP])
#define TRAP_sig(context)    ((context)->uc_mcontext.gregs[REG_TRAPNO])
#define ERROR_sig(context)   ((context)->uc_mcontext.gregs[REG_ERR])
#define MASK_sig(context)    ((context)->uc_sigmask)
#endif

int cpu_signal_handler(int host_signum, void *pinfo,
                       void *puc)
{
    siginfo_t *info = pinfo;
#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
    ucontext_t *uc = puc;
#elif defined(__OpenBSD__)
    struct sigcontext *uc = puc;
#else
    struct ucontext *uc = puc;
#endif
    unsigned long pc;
    int trapno;

#ifndef REG_EIP
/* for glibc 2.1 */
#define REG_EIP    EIP
#define REG_ERR    ERR
#define REG_TRAPNO TRAPNO
#endif
    pc = EIP_sig(uc);
    trapno = TRAP_sig(uc);
    return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                             trapno == 0xe ?
                             (ERROR_sig(uc) >> 1) & 1 : 0,
                             &MASK_sig(uc), puc);
}

#elif defined(__x86_64__)

#ifdef __NetBSD__
#define PC_sig(context)       _UC_MACHINE_PC(context)
#define TRAP_sig(context)     ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
#define ERROR_sig(context)    ((context)->uc_mcontext.__gregs[_REG_ERR])
#define MASK_sig(context)     ((context)->uc_sigmask)
#elif defined(__OpenBSD__)
#define PC_sig(context)       ((context)->sc_rip)
#define TRAP_sig(context)     ((context)->sc_trapno)
#define ERROR_sig(context)    ((context)->sc_err)
#define MASK_sig(context)     ((context)->sc_mask)
#elif defined(__FreeBSD__) || defined(__DragonFly__)
#include <ucontext.h>

#define PC_sig(context)  (*((unsigned long *)&(context)->uc_mcontext.mc_rip))
#define TRAP_sig(context)     ((context)->uc_mcontext.mc_trapno)
#define ERROR_sig(context)    ((context)->uc_mcontext.mc_err)
#define MASK_sig(context)     ((context)->uc_sigmask)
#else
#define PC_sig(context)       ((context)->uc_mcontext.gregs[REG_RIP])
#define TRAP_sig(context)     ((context)->uc_mcontext.gregs[REG_TRAPNO])
#define ERROR_sig(context)    ((context)->uc_mcontext.gregs[REG_ERR])
#define MASK_sig(context)     ((context)->uc_sigmask)
#endif

int cpu_signal_handler(int host_signum, void *pinfo,
                       void *puc)
{
    siginfo_t *info = pinfo;
    unsigned long pc;
#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
    ucontext_t *uc = puc;
#elif defined(__OpenBSD__)
    struct sigcontext *uc = puc;
#else
    struct ucontext *uc = puc;
#endif

    pc = PC_sig(uc);
    return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                             TRAP_sig(uc) == 0xe ?
                             (ERROR_sig(uc) >> 1) & 1 : 0,
                             &MASK_sig(uc), puc);
}

#elif defined(_ARCH_PPC)

/***********************************************************************
 * signal context platform-specific definitions
 * From Wine
 */
#ifdef linux
/* All Registers access - only for local access */
#define REG_sig(reg_name, context)              \
    ((context)->uc_mcontext.regs->reg_name)
/* Gpr Registers access  */
#define GPR_sig(reg_num, context)              REG_sig(gpr[reg_num], context)
/* Program counter */
#define IAR_sig(context)                       REG_sig(nip, context)
/* Machine State Register (Supervisor) */
#define MSR_sig(context)                       REG_sig(msr, context)
/* Count register */
#define CTR_sig(context)                       REG_sig(ctr, context)
/* User's integer exception register */
#define XER_sig(context)                       REG_sig(xer, context)
/* Link register */
#define LR_sig(context)                        REG_sig(link, context)
/* Condition register */
#define CR_sig(context)                        REG_sig(ccr, context)

/* Float Registers access  */
#define FLOAT_sig(reg_num, context)                                     \
    (((double *)((char *)((context)->uc_mcontext.regs + 48 * 4)))[reg_num])
#define FPSCR_sig(context) \
    (*(int *)((char *)((context)->uc_mcontext.regs + (48 + 32 * 2) * 4)))
/* Exception Registers access */
#define DAR_sig(context)                       REG_sig(dar, context)
#define DSISR_sig(context)                     REG_sig(dsisr, context)
#define TRAP_sig(context)                      REG_sig(trap, context)
#endif /* linux */

#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
#include <ucontext.h>
#define IAR_sig(context)               ((context)->uc_mcontext.mc_srr0)
#define MSR_sig(context)               ((context)->uc_mcontext.mc_srr1)
#define CTR_sig(context)               ((context)->uc_mcontext.mc_ctr)
#define XER_sig(context)               ((context)->uc_mcontext.mc_xer)
#define LR_sig(context)                ((context)->uc_mcontext.mc_lr)
#define CR_sig(context)                ((context)->uc_mcontext.mc_cr)
/* Exception Registers access */
#define DAR_sig(context)               ((context)->uc_mcontext.mc_dar)
#define DSISR_sig(context)             ((context)->uc_mcontext.mc_dsisr)
#define TRAP_sig(context)              ((context)->uc_mcontext.mc_exc)
#endif /* __FreeBSD__|| __FreeBSD_kernel__ */

#ifdef __APPLE__
#include <sys/ucontext.h>
typedef struct ucontext SIGCONTEXT;
/* All Registers access - only for local access */
#define REG_sig(reg_name, context)              \
    ((context)->uc_mcontext->ss.reg_name)
#define FLOATREG_sig(reg_name, context)         \
    ((context)->uc_mcontext->fs.reg_name)
#define EXCEPREG_sig(reg_name, context)         \
    ((context)->uc_mcontext->es.reg_name)
#define VECREG_sig(reg_name, context)           \
    ((context)->uc_mcontext->vs.reg_name)
/* Gpr Registers access */
#define GPR_sig(reg_num, context)              REG_sig(r##reg_num, context)
/* Program counter */
#define IAR_sig(context)                       REG_sig(srr0, context)
/* Machine State Register (Supervisor) */
#define MSR_sig(context)                       REG_sig(srr1, context)
#define CTR_sig(context)                       REG_sig(ctr, context)
/* Link register */
#define XER_sig(context)                       REG_sig(xer, context)
/* User's integer exception register */
#define LR_sig(context)                        REG_sig(lr, context)
/* Condition register */
#define CR_sig(context)                        REG_sig(cr, context)
/* Float Registers access */
#define FLOAT_sig(reg_num, context)             \
    FLOATREG_sig(fpregs[reg_num], context)
#define FPSCR_sig(context)                      \
    ((double)FLOATREG_sig(fpscr, context))
/* Exception Registers access */
/* Fault registers for coredump */
#define DAR_sig(context)                       EXCEPREG_sig(dar, context)
#define DSISR_sig(context)                     EXCEPREG_sig(dsisr, context)
/* number of powerpc exception taken */
#define TRAP_sig(context)                      EXCEPREG_sig(exception, context)
#endif /* __APPLE__ */

int cpu_signal_handler(int host_signum, void *pinfo,
                       void *puc)
{
    siginfo_t *info = pinfo;
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
    ucontext_t *uc = puc;
#else
    struct ucontext *uc = puc;
#endif
    unsigned long pc;
    int is_write;

    pc = IAR_sig(uc);
    is_write = 0;
#if 0
    /* ppc 4xx case */
    if (DSISR_sig(uc) & 0x00800000) {
        is_write = 1;
    }
#else
    if (TRAP_sig(uc) != 0x400 && (DSISR_sig(uc) & 0x02000000)) {
        is_write = 1;
    }
#endif
    return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                             is_write, &uc->uc_sigmask, puc);
}

#elif defined(__alpha__)

int cpu_signal_handler(int host_signum, void *pinfo,
                           void *puc)
{
    siginfo_t *info = pinfo;
    struct ucontext *uc = puc;
    uint32_t *pc = uc->uc_mcontext.sc_pc;
    uint32_t insn = *pc;
    int is_write = 0;

    /* XXX: need kernel patch to get write flag faster */
    switch (insn >> 26) {
    case 0x0d: /* stw */
    case 0x0e: /* stb */
    case 0x0f: /* stq_u */
    case 0x24: /* stf */
    case 0x25: /* stg */
    case 0x26: /* sts */
    case 0x27: /* stt */
    case 0x2c: /* stl */
    case 0x2d: /* stq */
    case 0x2e: /* stl_c */
    case 0x2f: /* stq_c */
        is_write = 1;
    }

    return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                             is_write, &uc->uc_sigmask, puc);
}
#elif defined(__sparc__)

int cpu_signal_handler(int host_signum, void *pinfo,
                       void *puc)
{
    siginfo_t *info = pinfo;
    int is_write;
    uint32_t insn;
#if !defined(__arch64__) || defined(CONFIG_SOLARIS)
    uint32_t *regs = (uint32_t *)(info + 1);
    void *sigmask = (regs + 20);
    /* XXX: is there a standard glibc define ? */
    unsigned long pc = regs[1];
#else
#ifdef __linux__
    struct sigcontext *sc = puc;
    unsigned long pc = sc->sigc_regs.tpc;
    void *sigmask = (void *)sc->sigc_mask;
#elif defined(__OpenBSD__)
    struct sigcontext *uc = puc;
    unsigned long pc = uc->sc_pc;
    void *sigmask = (void *)(long)uc->sc_mask;
#endif
#endif

    /* XXX: need kernel patch to get write flag faster */
    is_write = 0;
    insn = *(uint32_t *)pc;
    if ((insn >> 30) == 3) {
        switch ((insn >> 19) & 0x3f) {
        case 0x05: /* stb */
        case 0x15: /* stba */
        case 0x06: /* sth */
        case 0x16: /* stha */
        case 0x04: /* st */
        case 0x14: /* sta */
        case 0x07: /* std */
        case 0x17: /* stda */
        case 0x0e: /* stx */
        case 0x1e: /* stxa */
        case 0x24: /* stf */
        case 0x34: /* stfa */
        case 0x27: /* stdf */
        case 0x37: /* stdfa */
        case 0x26: /* stqf */
        case 0x36: /* stqfa */
        case 0x25: /* stfsr */
        case 0x3c: /* casa */
        case 0x3e: /* casxa */
            is_write = 1;
            break;
        }
    }
    return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                             is_write, sigmask, NULL);
}

#elif defined(__arm__)

int cpu_signal_handler(int host_signum, void *pinfo,
                       void *puc)
{
    siginfo_t *info = pinfo;
    struct ucontext *uc = puc;
    unsigned long pc;
    int is_write;

#if (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
    pc = uc->uc_mcontext.gregs[R15];
#else
    pc = uc->uc_mcontext.arm_pc;
#endif
    /* XXX: compute is_write */
    is_write = 0;
    return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                             is_write,
                             &uc->uc_sigmask, puc);
}

#elif defined(__mc68000)

int cpu_signal_handler(int host_signum, void *pinfo,
                       void *puc)
{
    siginfo_t *info = pinfo;
    struct ucontext *uc = puc;
    unsigned long pc;
    int is_write;

    pc = uc->uc_mcontext.gregs[16];
    /* XXX: compute is_write */
    is_write = 0;
    return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                             is_write,
                             &uc->uc_sigmask, puc);
}

#elif defined(__ia64)

#ifndef __ISR_VALID
  /* This ought to be in <bits/siginfo.h>... */
# define __ISR_VALID    1
#endif

int cpu_signal_handler(int host_signum, void *pinfo, void *puc)
{
    siginfo_t *info = pinfo;
    struct ucontext *uc = puc;
    unsigned long ip;
    int is_write = 0;

    ip = uc->uc_mcontext.sc_ip;
    switch (host_signum) {
    case SIGILL:
    case SIGFPE:
    case SIGSEGV:
    case SIGBUS:
    case SIGTRAP:
        if (info->si_code && (info->si_segvflags & __ISR_VALID)) {
            /* ISR.W (write-access) is bit 33:  */
            is_write = (info->si_isr >> 33) & 1;
        }
        break;

    default:
        break;
    }
    return handle_cpu_signal(ip, (unsigned long)info->si_addr,
                             is_write,
                             (sigset_t *)&uc->uc_sigmask, puc);
}

#elif defined(__s390__)

int cpu_signal_handler(int host_signum, void *pinfo,
                       void *puc)
{
    siginfo_t *info = pinfo;
    struct ucontext *uc = puc;
    unsigned long pc;
    uint16_t *pinsn;
    int is_write = 0;

    pc = uc->uc_mcontext.psw.addr;

    /* ??? On linux, the non-rt signal handler has 4 (!) arguments instead
       of the normal 2 arguments.  The 3rd argument contains the "int_code"
       from the hardware which does in fact contain the is_write value.
       The rt signal handler, as far as I can tell, does not give this value
       at all.  Not that we could get to it from here even if it were.  */
    /* ??? This is not even close to complete, since it ignores all
       of the read-modify-write instructions.  */
    pinsn = (uint16_t *)pc;
    switch (pinsn[0] >> 8) {
    case 0x50: /* ST */
    case 0x42: /* STC */
    case 0x40: /* STH */
        is_write = 1;
        break;
    case 0xc4: /* RIL format insns */
        switch (pinsn[0] & 0xf) {
        case 0xf: /* STRL */
        case 0xb: /* STGRL */
        case 0x7: /* STHRL */
            is_write = 1;
        }
        break;
    case 0xe3: /* RXY format insns */
        switch (pinsn[2] & 0xff) {
        case 0x50: /* STY */
        case 0x24: /* STG */
        case 0x72: /* STCY */
        case 0x70: /* STHY */
        case 0x8e: /* STPQ */
        case 0x3f: /* STRVH */
        case 0x3e: /* STRV */
        case 0x2f: /* STRVG */
            is_write = 1;
        }
        break;
    }
    return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                             is_write, &uc->uc_sigmask, puc);
}

#elif defined(__mips__)

int cpu_signal_handler(int host_signum, void *pinfo,
                       void *puc)
{
    siginfo_t *info = pinfo;
    struct ucontext *uc = puc;
    greg_t pc = uc->uc_mcontext.pc;
    int is_write;

    /* XXX: compute is_write */
    is_write = 0;
    return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                             is_write, &uc->uc_sigmask, puc);
}

#elif defined(__hppa__)

int cpu_signal_handler(int host_signum, void *pinfo,
                       void *puc)
{
    struct siginfo *info = pinfo;
    struct ucontext *uc = puc;
    unsigned long pc = uc->uc_mcontext.sc_iaoq[0];
    uint32_t insn = *(uint32_t *)pc;
    int is_write = 0;

    /* XXX: need kernel patch to get write flag faster.  */
    switch (insn >> 26) {
    case 0x1a: /* STW */
    case 0x19: /* STH */
    case 0x18: /* STB */
    case 0x1b: /* STWM */
        is_write = 1;
        break;

    case 0x09: /* CSTWX, FSTWX, FSTWS */
    case 0x0b: /* CSTDX, FSTDX, FSTDS */
        /* Distinguish from coprocessor load ... */
        is_write = (insn >> 9) & 1;
        break;

    case 0x03:
        switch ((insn >> 6) & 15) {
        case 0xa: /* STWS */
        case 0x9: /* STHS */
        case 0x8: /* STBS */
        case 0xe: /* STWAS */
        case 0xc: /* STBYS */
            is_write = 1;
        }
        break;
    }

    return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                             is_write, &uc->uc_sigmask, puc);
}

#else

#error host CPU specific signal handler needed

#endif
Commit	Line	Data
42a623c7 BS	1	/*
	2	* User emulator execution
	3	*
	4	* Copyright (c) 2003-2005 Fabrice Bellard
	5	*
	6	* This library is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU Lesser General Public
	8	* License as published by the Free Software Foundation; either
	9	* version 2 of the License, or (at your option) any later version.
	10	*
	11	* This library is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* Lesser General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU Lesser General Public
	17	* License along with this library; if not, see <http://www.gnu.org/licenses/>.
	18	*/
	19	#include "config.h"
3e457172 BS	20	#include "cpu.h"
3e457172 BS	21	#include "dyngen-exec.h"
42a623c7 BS	22	#include "disas.h"
	23	#include "tcg.h"
	24
	25	#undef EAX
	26	#undef ECX
	27	#undef EDX
	28	#undef EBX
	29	#undef ESP
	30	#undef EBP
	31	#undef ESI
	32	#undef EDI
	33	#undef EIP
	34	#include <signal.h>
	35	#ifdef __linux__
	36	#include <sys/ucontext.h>
	37	#endif
	38
	39	//#define DEBUG_SIGNAL
	40
9349b4f9	41	static void exception_action(CPUArchState *env1)
1162c041	42	{
42a623c7	43	#if defined(TARGET_I386)
3e457172	44	raise_exception_err_env(env1, env1->exception_index, env1->error_code);
42a623c7	45	#else
1162c041	46	cpu_loop_exit(env1);
42a623c7	47	#endif
1162c041	48	}
42a623c7 BS	49
	50	/* exit the current TB from a signal handler. The host registers are
	51	restored in a state compatible with the CPU emulator
	52	*/
9349b4f9	53	void cpu_resume_from_signal(CPUArchState env1, void puc)
42a623c7 BS	54	{
	55	#ifdef __linux__
	56	struct ucontext *uc = puc;
	57	#elif defined(__OpenBSD__)
	58	struct sigcontext *uc = puc;
	59	#endif
	60
	61	env = env1;
	62
	63	/* XXX: restore cpu registers saved in host registers */
	64
	65	if (puc) {
	66	/* XXX: use siglongjmp ? */
	67	#ifdef __linux__
	68	#ifdef __ia64
	69	sigprocmask(SIG_SETMASK, (sigset_t *)&uc->uc_sigmask, NULL);
	70	#else
	71	sigprocmask(SIG_SETMASK, &uc->uc_sigmask, NULL);
	72	#endif
	73	#elif defined(__OpenBSD__)
	74	sigprocmask(SIG_SETMASK, &uc->sc_mask, NULL);
	75	#endif
	76	}
	77	env->exception_index = -1;
	78	longjmp(env->jmp_env, 1);
	79	}
	80
	81	/* 'pc' is the host PC at which the exception was raised. 'address' is
	82	the effective address of the memory exception. 'is_write' is 1 if a
	83	write caused the exception and otherwise 0'. 'old_set' is the
	84	signal set which should be restored */
20503968	85	static inline int handle_cpu_signal(uintptr_t pc, unsigned long address,
42a623c7 BS	86	int is_write, sigset_t *old_set,
	87	void *puc)
	88	{
	89	TranslationBlock *tb;
	90	int ret;
	91
	92	if (cpu_single_env) {
	93	env = cpu_single_env; /* XXX: find a correct solution for multithread */
	94	}
	95	#if defined(DEBUG_SIGNAL)
	96	qemu_printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
	97	pc, address, is_write, (unsigned long )old_set);
	98	#endif
	99	/* XXX: locking issue */
c5954819 PM	100	if (is_write && h2g_valid(address)
c5954819 PM	101	&& page_unprotect(h2g(address), pc, puc)) {
42a623c7 BS	102	return 1;
	103	}
	104
	105	/* see if it is an MMU fault */
97b348e7	106	ret = cpu_handle_mmu_fault(env, address, is_write, MMU_USER_IDX);
42a623c7 BS	107	if (ret < 0) {
	108	return 0; /* not an MMU fault */
	109	}
	110	if (ret == 0) {
	111	return 1; /* the MMU fault was handled without causing real CPU fault */
	112	}
	113	/* now we have a real cpu fault */
	114	tb = tb_find_pc(pc);
	115	if (tb) {
	116	/* the PC is inside the translated code. It means that we have
	117	a virtual CPU fault */
	118	cpu_restore_state(tb, env, pc);
	119	}
	120
	121	/* we restore the process signal mask as the sigreturn should
	122	do it (XXX: use sigsetjmp) */
	123	sigprocmask(SIG_SETMASK, old_set, NULL);
1162c041	124	exception_action(env);
42a623c7 BS	125
	126	/* never comes here */
	127	return 1;
	128	}
	129
	130	#if defined(__i386__)
	131
	132	#if defined(__APPLE__)
	133	#include <sys/ucontext.h>
	134
	135	#define EIP_sig(context) (((unsigned long )&(context)->uc_mcontext->ss.eip))
	136	#define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
	137	#define ERROR_sig(context) ((context)->uc_mcontext->es.err)
	138	#define MASK_sig(context) ((context)->uc_sigmask)
	139	#elif defined(__NetBSD__)
	140	#include <ucontext.h>
	141
	142	#define EIP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EIP])
	143	#define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
	144	#define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
	145	#define MASK_sig(context) ((context)->uc_sigmask)
	146	#elif defined(__FreeBSD__) \|\| defined(__DragonFly__)
	147	#include <ucontext.h>
	148
	149	#define EIP_sig(context) (((unsigned long )&(context)->uc_mcontext.mc_eip))
	150	#define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
	151	#define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
	152	#define MASK_sig(context) ((context)->uc_sigmask)
	153	#elif defined(__OpenBSD__)
	154	#define EIP_sig(context) ((context)->sc_eip)
	155	#define TRAP_sig(context) ((context)->sc_trapno)
	156	#define ERROR_sig(context) ((context)->sc_err)
	157	#define MASK_sig(context) ((context)->sc_mask)
	158	#else
	159	#define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
	160	#define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
	161	#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
	162	#define MASK_sig(context) ((context)->uc_sigmask)
	163	#endif
	164
	165	int cpu_signal_handler(int host_signum, void *pinfo,
	166	void *puc)
	167	{
	168	siginfo_t *info = pinfo;
	169	#if defined(__NetBSD__) \|\| defined(__FreeBSD__) \|\| defined(__DragonFly__)
	170	ucontext_t *uc = puc;
	171	#elif defined(__OpenBSD__)
	172	struct sigcontext *uc = puc;
	173	#else
	174	struct ucontext *uc = puc;
	175	#endif
	176	unsigned long pc;
	177	int trapno;
	178
	179	#ifndef REG_EIP
	180	/* for glibc 2.1 */
	181	#define REG_EIP EIP
	182	#define REG_ERR ERR
	183	#define REG_TRAPNO TRAPNO
	184	#endif
	185	pc = EIP_sig(uc);
	186	trapno = TRAP_sig(uc);
	187	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
	188	trapno == 0xe ?
189	(ERROR_sig(uc) >> 1) & 1 : 0,
190	&MASK_sig(uc), puc);
191	}
192
193	#elif defined(__x86_64__)
194
195	#ifdef __NetBSD__
196	#define PC_sig(context) _UC_MACHINE_PC(context)
197	#define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
198	#define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
199	#define MASK_sig(context) ((context)->uc_sigmask)
200	#elif defined(__OpenBSD__)
201	#define PC_sig(context) ((context)->sc_rip)
202	#define TRAP_sig(context) ((context)->sc_trapno)
203	#define ERROR_sig(context) ((context)->sc_err)
204	#define MASK_sig(context) ((context)->sc_mask)
205	#elif defined(__FreeBSD__) \|\| defined(__DragonFly__)
206	#include <ucontext.h>
207
208	#define PC_sig(context) (((unsigned long )&(context)->uc_mcontext.mc_rip))
209	#define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
210	#define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
211	#define MASK_sig(context) ((context)->uc_sigmask)
212	#else
213	#define PC_sig(context) ((context)->uc_mcontext.gregs[REG_RIP])
214	#define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
215	#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
216	#define MASK_sig(context) ((context)->uc_sigmask)
217	#endif
218
219	int cpu_signal_handler(int host_signum, void *pinfo,
220	void *puc)
221	{
222	siginfo_t *info = pinfo;
223	unsigned long pc;
224	#if defined(__NetBSD__) \|\| defined(__FreeBSD__) \|\| defined(__DragonFly__)
225	ucontext_t *uc = puc;
226	#elif defined(__OpenBSD__)
227	struct sigcontext *uc = puc;
228	#else
229	struct ucontext *uc = puc;
230	#endif
231
232	pc = PC_sig(uc);
233	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
234	TRAP_sig(uc) == 0xe ?
235	(ERROR_sig(uc) >> 1) & 1 : 0,
236	&MASK_sig(uc), puc);
237	}
238
239	#elif defined(_ARCH_PPC)
240
241	/***********************************************************************
242	* signal context platform-specific definitions
243	* From Wine
244	*/
245	#ifdef linux
246	/* All Registers access - only for local access */
247	#define REG_sig(reg_name, context) \
248	((context)->uc_mcontext.regs->reg_name)
249	/* Gpr Registers access */
250	#define GPR_sig(reg_num, context) REG_sig(gpr[reg_num], context)
251	/* Program counter */
252	#define IAR_sig(context) REG_sig(nip, context)
253	/* Machine State Register (Supervisor) */
254	#define MSR_sig(context) REG_sig(msr, context)
255	/* Count register */
256	#define CTR_sig(context) REG_sig(ctr, context)
257	/* User's integer exception register */
258	#define XER_sig(context) REG_sig(xer, context)
259	/* Link register */
260	#define LR_sig(context) REG_sig(link, context)
261	/* Condition register */
262	#define CR_sig(context) REG_sig(ccr, context)
263
264	/* Float Registers access */
265	#define FLOAT_sig(reg_num, context) \
266	(((double )((char )((context)->uc_mcontext.regs + 48 * 4)))[reg_num])
267	#define FPSCR_sig(context) \
268	((int )((char )((context)->uc_mcontext.regs + (48 + 32 2) * 4)))
269	/* Exception Registers access */
270	#define DAR_sig(context) REG_sig(dar, context)
271	#define DSISR_sig(context) REG_sig(dsisr, context)
272	#define TRAP_sig(context) REG_sig(trap, context)
273	#endif /* linux */
274
275	#if defined(__FreeBSD__) \|\| defined(__FreeBSD_kernel__)
276	#include <ucontext.h>
277	#define IAR_sig(context) ((context)->uc_mcontext.mc_srr0)
278	#define MSR_sig(context) ((context)->uc_mcontext.mc_srr1)
279	#define CTR_sig(context) ((context)->uc_mcontext.mc_ctr)
280	#define XER_sig(context) ((context)->uc_mcontext.mc_xer)
281	#define LR_sig(context) ((context)->uc_mcontext.mc_lr)
282	#define CR_sig(context) ((context)->uc_mcontext.mc_cr)
283	/* Exception Registers access */
284	#define DAR_sig(context) ((context)->uc_mcontext.mc_dar)
285	#define DSISR_sig(context) ((context)->uc_mcontext.mc_dsisr)
286	#define TRAP_sig(context) ((context)->uc_mcontext.mc_exc)
287	#endif /* __FreeBSD__\|\| __FreeBSD_kernel__ */
288
289	#ifdef __APPLE__
290	#include <sys/ucontext.h>
291	typedef struct ucontext SIGCONTEXT;
292	/* All Registers access - only for local access */
293	#define REG_sig(reg_name, context) \
294	((context)->uc_mcontext->ss.reg_name)
295	#define FLOATREG_sig(reg_name, context) \
296	((context)->uc_mcontext->fs.reg_name)
297	#define EXCEPREG_sig(reg_name, context) \
298	((context)->uc_mcontext->es.reg_name)
299	#define VECREG_sig(reg_name, context) \
300	((context)->uc_mcontext->vs.reg_name)
301	/* Gpr Registers access */
302	#define GPR_sig(reg_num, context) REG_sig(r##reg_num, context)
303	/* Program counter */
304	#define IAR_sig(context) REG_sig(srr0, context)
305	/* Machine State Register (Supervisor) */
306	#define MSR_sig(context) REG_sig(srr1, context)
307	#define CTR_sig(context) REG_sig(ctr, context)
308	/* Link register */
309	#define XER_sig(context) REG_sig(xer, context)
310	/* User's integer exception register */
311	#define LR_sig(context) REG_sig(lr, context)
312	/* Condition register */
313	#define CR_sig(context) REG_sig(cr, context)
314	/* Float Registers access */
315	#define FLOAT_sig(reg_num, context) \
316	FLOATREG_sig(fpregs[reg_num], context)
317	#define FPSCR_sig(context) \
318	((double)FLOATREG_sig(fpscr, context))
319	/* Exception Registers access */
320	/* Fault registers for coredump */
321	#define DAR_sig(context) EXCEPREG_sig(dar, context)
322	#define DSISR_sig(context) EXCEPREG_sig(dsisr, context)
323	/* number of powerpc exception taken */
324	#define TRAP_sig(context) EXCEPREG_sig(exception, context)
325	#endif /* __APPLE__ */
326
327	int cpu_signal_handler(int host_signum, void *pinfo,
328	void *puc)
329	{
330	siginfo_t *info = pinfo;
331	#if defined(__FreeBSD__) \|\| defined(__FreeBSD_kernel__)
332	ucontext_t *uc = puc;
333	#else
334	struct ucontext *uc = puc;
335	#endif
336	unsigned long pc;
337	int is_write;
338
339	pc = IAR_sig(uc);
340	is_write = 0;
341	#if 0
342	/* ppc 4xx case */
343	if (DSISR_sig(uc) & 0x00800000) {
344	is_write = 1;
345	}
346	#else
347	if (TRAP_sig(uc) != 0x400 && (DSISR_sig(uc) & 0x02000000)) {
348	is_write = 1;
349	}
350	#endif
351	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
352	is_write, &uc->uc_sigmask, puc);
353	}
354
355	#elif defined(__alpha__)
356
357	int cpu_signal_handler(int host_signum, void *pinfo,
358	void *puc)
359	{
360	siginfo_t *info = pinfo;
361	struct ucontext *uc = puc;
362	uint32_t *pc = uc->uc_mcontext.sc_pc;
363	uint32_t insn = *pc;
364	int is_write = 0;
365
366	/* XXX: need kernel patch to get write flag faster */
367	switch (insn >> 26) {
368	case 0x0d: /* stw */
369	case 0x0e: /* stb */
370	case 0x0f: /* stq_u */
371	case 0x24: /* stf */
372	case 0x25: /* stg */
373	case 0x26: /* sts */
374	case 0x27: /* stt */
375	case 0x2c: /* stl */
376	case 0x2d: /* stq */
377	case 0x2e: /* stl_c */
378	case 0x2f: /* stq_c */
379	is_write = 1;
380	}
381
382	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
383	is_write, &uc->uc_sigmask, puc);
384	}
385	#elif defined(__sparc__)
386
387	int cpu_signal_handler(int host_signum, void *pinfo,
388	void *puc)
389	{
390	siginfo_t *info = pinfo;
391	int is_write;
392	uint32_t insn;
393	#if !defined(__arch64__) \|\| defined(CONFIG_SOLARIS)
394	uint32_t regs = (uint32_t )(info + 1);
395	void *sigmask = (regs + 20);
396	/* XXX: is there a standard glibc define ? */
397	unsigned long pc = regs[1];
398	#else
399	#ifdef __linux__
400	struct sigcontext *sc = puc;
401	unsigned long pc = sc->sigc_regs.tpc;
402	void sigmask = (void )sc->sigc_mask;
403	#elif defined(__OpenBSD__)
404	struct sigcontext *uc = puc;
405	unsigned long pc = uc->sc_pc;
406	void sigmask = (void )(long)uc->sc_mask;
407	#endif
408	#endif
409
410	/* XXX: need kernel patch to get write flag faster */
411	is_write = 0;
412	insn = (uint32_t )pc;
413	if ((insn >> 30) == 3) {
414	switch ((insn >> 19) & 0x3f) {
415	case 0x05: /* stb */
416	case 0x15: /* stba */
417	case 0x06: /* sth */
418	case 0x16: /* stha */
419	case 0x04: /* st */
420	case 0x14: /* sta */
421	case 0x07: /* std */
422	case 0x17: /* stda */
423	case 0x0e: /* stx */
424	case 0x1e: /* stxa */
425	case 0x24: /* stf */
426	case 0x34: /* stfa */
427	case 0x27: /* stdf */
428	case 0x37: /* stdfa */
429	case 0x26: /* stqf */
430	case 0x36: /* stqfa */
431	case 0x25: /* stfsr */
432	case 0x3c: /* casa */
433	case 0x3e: /* casxa */
434	is_write = 1;
435	break;
436	}
437	}
438	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
439	is_write, sigmask, NULL);
440	}
441
442	#elif defined(__arm__)
443
444	int cpu_signal_handler(int host_signum, void *pinfo,
445	void *puc)
446	{
447	siginfo_t *info = pinfo;
448	struct ucontext *uc = puc;
449	unsigned long pc;
450	int is_write;
451
452	#if (__GLIBC__ < 2 \|\| (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
453	pc = uc->uc_mcontext.gregs[R15];
454	#else
455	pc = uc->uc_mcontext.arm_pc;
456	#endif
457	/* XXX: compute is_write */
458	is_write = 0;
459	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
460	is_write,
461	&uc->uc_sigmask, puc);
462	}
463
464	#elif defined(__mc68000)
465
466	int cpu_signal_handler(int host_signum, void *pinfo,
467	void *puc)
468	{
469	siginfo_t *info = pinfo;
470	struct ucontext *uc = puc;
471	unsigned long pc;
472	int is_write;
473
474	pc = uc->uc_mcontext.gregs[16];
475	/* XXX: compute is_write */
476	is_write = 0;
477	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
478	is_write,
479	&uc->uc_sigmask, puc);
480	}
481
482	#elif defined(__ia64)
483
484	#ifndef __ISR_VALID
485	/* This ought to be in <bits/siginfo.h>... */
486	# define __ISR_VALID 1
487	#endif
488
489	int cpu_signal_handler(int host_signum, void pinfo, void puc)
490	{
491	siginfo_t *info = pinfo;
492	struct ucontext *uc = puc;
493	unsigned long ip;
494	int is_write = 0;
495
496	ip = uc->uc_mcontext.sc_ip;
497	switch (host_signum) {
498	case SIGILL:
499	case SIGFPE:
500	case SIGSEGV:
501	case SIGBUS:
502	case SIGTRAP:
503	if (info->si_code && (info->si_segvflags & __ISR_VALID)) {
504	/* ISR.W (write-access) is bit 33: */
505	is_write = (info->si_isr >> 33) & 1;
506	}
507	break;
508
509	default:
510	break;
511	}
512	return handle_cpu_signal(ip, (unsigned long)info->si_addr,
513	is_write,
514	(sigset_t *)&uc->uc_sigmask, puc);
515	}
516
517	#elif defined(__s390__)
518
519	int cpu_signal_handler(int host_signum, void *pinfo,
520	void *puc)
521	{
522	siginfo_t *info = pinfo;
523	struct ucontext *uc = puc;
524	unsigned long pc;
525	uint16_t *pinsn;
526	int is_write = 0;
527
528	pc = uc->uc_mcontext.psw.addr;
529
530	/* ??? On linux, the non-rt signal handler has 4 (!) arguments instead
531	of the normal 2 arguments. The 3rd argument contains the "int_code"
532	from the hardware which does in fact contain the is_write value.
533	The rt signal handler, as far as I can tell, does not give this value
534	at all. Not that we could get to it from here even if it were. */
535	/* ??? This is not even close to complete, since it ignores all
536	of the read-modify-write instructions. */
537	pinsn = (uint16_t *)pc;
538	switch (pinsn[0] >> 8) {
539	case 0x50: /* ST */
540	case 0x42: /* STC */
541	case 0x40: /* STH */
542	is_write = 1;
543	break;
544	case 0xc4: /* RIL format insns */
545	switch (pinsn[0] & 0xf) {
546	case 0xf: /* STRL */
547	case 0xb: /* STGRL */
548	case 0x7: /* STHRL */
549	is_write = 1;
550	}
551	break;
552	case 0xe3: /* RXY format insns */
553	switch (pinsn[2] & 0xff) {
554	case 0x50: /* STY */
555	case 0x24: /* STG */
556	case 0x72: /* STCY */
557	case 0x70: /* STHY */
558	case 0x8e: /* STPQ */
559	case 0x3f: /* STRVH */
560	case 0x3e: /* STRV */
561	case 0x2f: /* STRVG */
562	is_write = 1;
563	}
564	break;
565	}
566	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
567	is_write, &uc->uc_sigmask, puc);
568	}
569
570	#elif defined(__mips__)
571
572	int cpu_signal_handler(int host_signum, void *pinfo,
573	void *puc)
574	{
575	siginfo_t *info = pinfo;
576	struct ucontext *uc = puc;
577	greg_t pc = uc->uc_mcontext.pc;
578	int is_write;
579
580	/* XXX: compute is_write */
581	is_write = 0;
582	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
583	is_write, &uc->uc_sigmask, puc);
584	}
585
586	#elif defined(__hppa__)
587
588	int cpu_signal_handler(int host_signum, void *pinfo,
589	void *puc)
590	{
591	struct siginfo *info = pinfo;
592	struct ucontext *uc = puc;
593	unsigned long pc = uc->uc_mcontext.sc_iaoq[0];
594	uint32_t insn = (uint32_t )pc;
595	int is_write = 0;
596
597	/* XXX: need kernel patch to get write flag faster. */
598	switch (insn >> 26) {
599	case 0x1a: /* STW */
600	case 0x19: /* STH */
601	case 0x18: /* STB */
602	case 0x1b: /* STWM */
603	is_write = 1;
604	break;
605
606	case 0x09: /* CSTWX, FSTWX, FSTWS */
607	case 0x0b: /* CSTDX, FSTDX, FSTDS */
608	/* Distinguish from coprocessor load ... */
609	is_write = (insn >> 9) & 1;
610	break;
611
612	case 0x03:
613	switch ((insn >> 6) & 15) {
614	case 0xa: /* STWS */
615	case 0x9: /* STHS */
616	case 0x8: /* STBS */
617	case 0xe: /* STWAS */
618	case 0xc: /* STBYS */
619	is_write = 1;
620	}
621	break;
622	}
623
624	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
625	is_write, &uc->uc_sigmask, puc);
626	}
627
628	#else
629
630	#error host CPU specific signal handler needed
631
632	#endif