[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 "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(CPUState *env1)
{
#if defined(TARGET_I386)
    raise_exception_err(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(CPUState *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(unsigned long 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 && 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, 0);
    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

#if defined(TARGET_I386)

void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector)
{
    CPUX86State *saved_env;

    saved_env = env;
    env = s;
    if (!(env->cr[0] & CR0_PE_MASK) || (env->eflags & VM_MASK)) {
        selector &= 0xffff;
        cpu_x86_load_seg_cache(env, seg_reg, selector,
                               (selector << 4), 0xffff, 0);
    } else {
        helper_load_seg(seg_reg, selector);
    }
    env = saved_env;
}

void cpu_x86_fsave(CPUX86State *s, target_ulong ptr, int data32)
{
    CPUX86State *saved_env;

    saved_env = env;
    env = s;

    helper_fsave(ptr, data32);

    env = saved_env;
}

void cpu_x86_frstor(CPUX86State *s, target_ulong ptr, int data32)
{
    CPUX86State *saved_env;

    saved_env = env;
    env = s;

    helper_frstor(ptr, data32);

    env = saved_env;
}

#endif /* TARGET_I386 */
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"
	20	#include "exec.h"
	21	#include "disas.h"
	22	#include "tcg.h"
	23
	24	#undef EAX
	25	#undef ECX
	26	#undef EDX
	27	#undef EBX
	28	#undef ESP
	29	#undef EBP
	30	#undef ESI
	31	#undef EDI
	32	#undef EIP
	33	#include <signal.h>
	34	#ifdef __linux__
	35	#include <sys/ucontext.h>
	36	#endif
	37
	38	//#define DEBUG_SIGNAL
	39
1162c041 BS	40	static void exception_action(CPUState *env1)
1162c041 BS	41	{
42a623c7	42	#if defined(TARGET_I386)
1162c041	43	raise_exception_err(env1->exception_index, env1->error_code);
42a623c7	44	#else
1162c041	45	cpu_loop_exit(env1);
42a623c7	46	#endif
1162c041	47	}
42a623c7 BS	48
	49	/* exit the current TB from a signal handler. The host registers are
	50	restored in a state compatible with the CPU emulator
	51	*/
	52	void cpu_resume_from_signal(CPUState env1, void puc)
	53	{
	54	#ifdef __linux__
	55	struct ucontext *uc = puc;
	56	#elif defined(__OpenBSD__)
	57	struct sigcontext *uc = puc;
	58	#endif
	59
	60	env = env1;
	61
	62	/* XXX: restore cpu registers saved in host registers */
	63
	64	if (puc) {
	65	/* XXX: use siglongjmp ? */
	66	#ifdef __linux__
	67	#ifdef __ia64
	68	sigprocmask(SIG_SETMASK, (sigset_t *)&uc->uc_sigmask, NULL);
	69	#else
	70	sigprocmask(SIG_SETMASK, &uc->uc_sigmask, NULL);
	71	#endif
	72	#elif defined(__OpenBSD__)
	73	sigprocmask(SIG_SETMASK, &uc->sc_mask, NULL);
	74	#endif
	75	}
	76	env->exception_index = -1;
	77	longjmp(env->jmp_env, 1);
	78	}
	79
	80	/* 'pc' is the host PC at which the exception was raised. 'address' is
	81	the effective address of the memory exception. 'is_write' is 1 if a
	82	write caused the exception and otherwise 0'. 'old_set' is the
	83	signal set which should be restored */
	84	static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
	85	int is_write, sigset_t *old_set,
	86	void *puc)
	87	{
	88	TranslationBlock *tb;
	89	int ret;
	90
	91	if (cpu_single_env) {
	92	env = cpu_single_env; /* XXX: find a correct solution for multithread */
	93	}
	94	#if defined(DEBUG_SIGNAL)
	95	qemu_printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
	96	pc, address, is_write, (unsigned long )old_set);
	97	#endif
	98	/* XXX: locking issue */
	99	if (is_write && page_unprotect(h2g(address), pc, puc)) {
	100	return 1;
	101	}
	102
	103	/* see if it is an MMU fault */
	104	ret = cpu_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
	105	if (ret < 0) {
	106	return 0; /* not an MMU fault */
	107	}
	108	if (ret == 0) {
	109	return 1; /* the MMU fault was handled without causing real CPU fault */
	110	}
	111	/* now we have a real cpu fault */
112	tb = tb_find_pc(pc);
113	if (tb) {
114	/* the PC is inside the translated code. It means that we have
115	a virtual CPU fault */
116	cpu_restore_state(tb, env, pc);
117	}
118
119	/* we restore the process signal mask as the sigreturn should
120	do it (XXX: use sigsetjmp) */
121	sigprocmask(SIG_SETMASK, old_set, NULL);
1162c041	122	exception_action(env);
42a623c7 BS	123
	124	/* never comes here */
	125	return 1;
	126	}
	127
	128	#if defined(__i386__)
	129
	130	#if defined(__APPLE__)
	131	#include <sys/ucontext.h>
	132
	133	#define EIP_sig(context) (((unsigned long )&(context)->uc_mcontext->ss.eip))
	134	#define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
	135	#define ERROR_sig(context) ((context)->uc_mcontext->es.err)
	136	#define MASK_sig(context) ((context)->uc_sigmask)
	137	#elif defined(__NetBSD__)
	138	#include <ucontext.h>
	139
	140	#define EIP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EIP])
	141	#define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
	142	#define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
	143	#define MASK_sig(context) ((context)->uc_sigmask)
	144	#elif defined(__FreeBSD__) \|\| defined(__DragonFly__)
	145	#include <ucontext.h>
	146
	147	#define EIP_sig(context) (((unsigned long )&(context)->uc_mcontext.mc_eip))
	148	#define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
	149	#define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
	150	#define MASK_sig(context) ((context)->uc_sigmask)
	151	#elif defined(__OpenBSD__)
	152	#define EIP_sig(context) ((context)->sc_eip)
	153	#define TRAP_sig(context) ((context)->sc_trapno)
	154	#define ERROR_sig(context) ((context)->sc_err)
	155	#define MASK_sig(context) ((context)->sc_mask)
	156	#else
	157	#define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
	158	#define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
	159	#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
	160	#define MASK_sig(context) ((context)->uc_sigmask)
	161	#endif
	162
	163	int cpu_signal_handler(int host_signum, void *pinfo,
	164	void *puc)
	165	{
	166	siginfo_t *info = pinfo;
	167	#if defined(__NetBSD__) \|\| defined(__FreeBSD__) \|\| defined(__DragonFly__)
	168	ucontext_t *uc = puc;
	169	#elif defined(__OpenBSD__)
	170	struct sigcontext *uc = puc;
	171	#else
	172	struct ucontext *uc = puc;
	173	#endif
	174	unsigned long pc;
	175	int trapno;
	176
	177	#ifndef REG_EIP
	178	/* for glibc 2.1 */
	179	#define REG_EIP EIP
	180	#define REG_ERR ERR
	181	#define REG_TRAPNO TRAPNO
	182	#endif
	183	pc = EIP_sig(uc);
	184	trapno = TRAP_sig(uc);
	185	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
	186	trapno == 0xe ?
187	(ERROR_sig(uc) >> 1) & 1 : 0,
188	&MASK_sig(uc), puc);
189	}
190
191	#elif defined(__x86_64__)
192
193	#ifdef __NetBSD__
194	#define PC_sig(context) _UC_MACHINE_PC(context)
195	#define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
196	#define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
197	#define MASK_sig(context) ((context)->uc_sigmask)
198	#elif defined(__OpenBSD__)
199	#define PC_sig(context) ((context)->sc_rip)
200	#define TRAP_sig(context) ((context)->sc_trapno)
201	#define ERROR_sig(context) ((context)->sc_err)
202	#define MASK_sig(context) ((context)->sc_mask)
203	#elif defined(__FreeBSD__) \|\| defined(__DragonFly__)
204	#include <ucontext.h>
205
206	#define PC_sig(context) (((unsigned long )&(context)->uc_mcontext.mc_rip))
207	#define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
208	#define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
209	#define MASK_sig(context) ((context)->uc_sigmask)
210	#else
211	#define PC_sig(context) ((context)->uc_mcontext.gregs[REG_RIP])
212	#define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
213	#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
214	#define MASK_sig(context) ((context)->uc_sigmask)
215	#endif
216
217	int cpu_signal_handler(int host_signum, void *pinfo,
218	void *puc)
219	{
220	siginfo_t *info = pinfo;
221	unsigned long pc;
222	#if defined(__NetBSD__) \|\| defined(__FreeBSD__) \|\| defined(__DragonFly__)
223	ucontext_t *uc = puc;
224	#elif defined(__OpenBSD__)
225	struct sigcontext *uc = puc;
226	#else
227	struct ucontext *uc = puc;
228	#endif
229
230	pc = PC_sig(uc);
231	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
232	TRAP_sig(uc) == 0xe ?
233	(ERROR_sig(uc) >> 1) & 1 : 0,
234	&MASK_sig(uc), puc);
235	}
236
237	#elif defined(_ARCH_PPC)
238
239	/***********************************************************************
240	* signal context platform-specific definitions
241	* From Wine
242	*/
243	#ifdef linux
244	/* All Registers access - only for local access */
245	#define REG_sig(reg_name, context) \
246	((context)->uc_mcontext.regs->reg_name)
247	/* Gpr Registers access */
248	#define GPR_sig(reg_num, context) REG_sig(gpr[reg_num], context)
249	/* Program counter */
250	#define IAR_sig(context) REG_sig(nip, context)
251	/* Machine State Register (Supervisor) */
252	#define MSR_sig(context) REG_sig(msr, context)
253	/* Count register */
254	#define CTR_sig(context) REG_sig(ctr, context)
255	/* User's integer exception register */
256	#define XER_sig(context) REG_sig(xer, context)
257	/* Link register */
258	#define LR_sig(context) REG_sig(link, context)
259	/* Condition register */
260	#define CR_sig(context) REG_sig(ccr, context)
261
262	/* Float Registers access */
263	#define FLOAT_sig(reg_num, context) \
264	(((double )((char )((context)->uc_mcontext.regs + 48 * 4)))[reg_num])
265	#define FPSCR_sig(context) \
266	((int )((char )((context)->uc_mcontext.regs + (48 + 32 2) * 4)))
267	/* Exception Registers access */
268	#define DAR_sig(context) REG_sig(dar, context)
269	#define DSISR_sig(context) REG_sig(dsisr, context)
270	#define TRAP_sig(context) REG_sig(trap, context)
271	#endif /* linux */
272
273	#if defined(__FreeBSD__) \|\| defined(__FreeBSD_kernel__)
274	#include <ucontext.h>
275	#define IAR_sig(context) ((context)->uc_mcontext.mc_srr0)
276	#define MSR_sig(context) ((context)->uc_mcontext.mc_srr1)
277	#define CTR_sig(context) ((context)->uc_mcontext.mc_ctr)
278	#define XER_sig(context) ((context)->uc_mcontext.mc_xer)
279	#define LR_sig(context) ((context)->uc_mcontext.mc_lr)
280	#define CR_sig(context) ((context)->uc_mcontext.mc_cr)
281	/* Exception Registers access */
282	#define DAR_sig(context) ((context)->uc_mcontext.mc_dar)
283	#define DSISR_sig(context) ((context)->uc_mcontext.mc_dsisr)
284	#define TRAP_sig(context) ((context)->uc_mcontext.mc_exc)
285	#endif /* __FreeBSD__\|\| __FreeBSD_kernel__ */
286
287	#ifdef __APPLE__
288	#include <sys/ucontext.h>
289	typedef struct ucontext SIGCONTEXT;
290	/* All Registers access - only for local access */
291	#define REG_sig(reg_name, context) \
292	((context)->uc_mcontext->ss.reg_name)
293	#define FLOATREG_sig(reg_name, context) \
294	((context)->uc_mcontext->fs.reg_name)
295	#define EXCEPREG_sig(reg_name, context) \
296	((context)->uc_mcontext->es.reg_name)
297	#define VECREG_sig(reg_name, context) \
298	((context)->uc_mcontext->vs.reg_name)
299	/* Gpr Registers access */
300	#define GPR_sig(reg_num, context) REG_sig(r##reg_num, context)
301	/* Program counter */
302	#define IAR_sig(context) REG_sig(srr0, context)
303	/* Machine State Register (Supervisor) */
304	#define MSR_sig(context) REG_sig(srr1, context)
305	#define CTR_sig(context) REG_sig(ctr, context)
306	/* Link register */
307	#define XER_sig(context) REG_sig(xer, context)
308	/* User's integer exception register */
309	#define LR_sig(context) REG_sig(lr, context)
310	/* Condition register */
311	#define CR_sig(context) REG_sig(cr, context)
312	/* Float Registers access */
313	#define FLOAT_sig(reg_num, context) \
314	FLOATREG_sig(fpregs[reg_num], context)
315	#define FPSCR_sig(context) \
316	((double)FLOATREG_sig(fpscr, context))
317	/* Exception Registers access */
318	/* Fault registers for coredump */
319	#define DAR_sig(context) EXCEPREG_sig(dar, context)
320	#define DSISR_sig(context) EXCEPREG_sig(dsisr, context)
321	/* number of powerpc exception taken */
322	#define TRAP_sig(context) EXCEPREG_sig(exception, context)
323	#endif /* __APPLE__ */
324
325	int cpu_signal_handler(int host_signum, void *pinfo,
326	void *puc)
327	{
328	siginfo_t *info = pinfo;
329	#if defined(__FreeBSD__) \|\| defined(__FreeBSD_kernel__)
330	ucontext_t *uc = puc;
331	#else
332	struct ucontext *uc = puc;
333	#endif
334	unsigned long pc;
335	int is_write;
336
337	pc = IAR_sig(uc);
338	is_write = 0;
339	#if 0
340	/* ppc 4xx case */
341	if (DSISR_sig(uc) & 0x00800000) {
342	is_write = 1;
343	}
344	#else
345	if (TRAP_sig(uc) != 0x400 && (DSISR_sig(uc) & 0x02000000)) {
346	is_write = 1;
347	}
348	#endif
349	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
350	is_write, &uc->uc_sigmask, puc);
351	}
352
353	#elif defined(__alpha__)
354
355	int cpu_signal_handler(int host_signum, void *pinfo,
356	void *puc)
357	{
358	siginfo_t *info = pinfo;
359	struct ucontext *uc = puc;
360	uint32_t *pc = uc->uc_mcontext.sc_pc;
361	uint32_t insn = *pc;
362	int is_write = 0;
363
364	/* XXX: need kernel patch to get write flag faster */
365	switch (insn >> 26) {
366	case 0x0d: /* stw */
367	case 0x0e: /* stb */
368	case 0x0f: /* stq_u */
369	case 0x24: /* stf */
370	case 0x25: /* stg */
371	case 0x26: /* sts */
372	case 0x27: /* stt */
373	case 0x2c: /* stl */
374	case 0x2d: /* stq */
375	case 0x2e: /* stl_c */
376	case 0x2f: /* stq_c */
377	is_write = 1;
378	}
379
380	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
381	is_write, &uc->uc_sigmask, puc);
382	}
383	#elif defined(__sparc__)
384
385	int cpu_signal_handler(int host_signum, void *pinfo,
386	void *puc)
387	{
388	siginfo_t *info = pinfo;
389	int is_write;
390	uint32_t insn;
391	#if !defined(__arch64__) \|\| defined(CONFIG_SOLARIS)
392	uint32_t regs = (uint32_t )(info + 1);
393	void *sigmask = (regs + 20);
394	/* XXX: is there a standard glibc define ? */
395	unsigned long pc = regs[1];
396	#else
397	#ifdef __linux__
398	struct sigcontext *sc = puc;
399	unsigned long pc = sc->sigc_regs.tpc;
400	void sigmask = (void )sc->sigc_mask;
401	#elif defined(__OpenBSD__)
402	struct sigcontext *uc = puc;
403	unsigned long pc = uc->sc_pc;
404	void sigmask = (void )(long)uc->sc_mask;
405	#endif
406	#endif
407
408	/* XXX: need kernel patch to get write flag faster */
409	is_write = 0;
410	insn = (uint32_t )pc;
411	if ((insn >> 30) == 3) {
412	switch ((insn >> 19) & 0x3f) {
413	case 0x05: /* stb */
414	case 0x15: /* stba */
415	case 0x06: /* sth */
416	case 0x16: /* stha */
417	case 0x04: /* st */
418	case 0x14: /* sta */
419	case 0x07: /* std */
420	case 0x17: /* stda */
421	case 0x0e: /* stx */
422	case 0x1e: /* stxa */
423	case 0x24: /* stf */
424	case 0x34: /* stfa */
425	case 0x27: /* stdf */
426	case 0x37: /* stdfa */
427	case 0x26: /* stqf */
428	case 0x36: /* stqfa */
429	case 0x25: /* stfsr */
430	case 0x3c: /* casa */
431	case 0x3e: /* casxa */
432	is_write = 1;
433	break;
434	}
435	}
436	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
437	is_write, sigmask, NULL);
438	}
439
440	#elif defined(__arm__)
441
442	int cpu_signal_handler(int host_signum, void *pinfo,
443	void *puc)
444	{
445	siginfo_t *info = pinfo;
446	struct ucontext *uc = puc;
447	unsigned long pc;
448	int is_write;
449
450	#if (__GLIBC__ < 2 \|\| (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
451	pc = uc->uc_mcontext.gregs[R15];
452	#else
453	pc = uc->uc_mcontext.arm_pc;
454	#endif
455	/* XXX: compute is_write */
456	is_write = 0;
457	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
458	is_write,
459	&uc->uc_sigmask, puc);
460	}
461
462	#elif defined(__mc68000)
463
464	int cpu_signal_handler(int host_signum, void *pinfo,
465	void *puc)
466	{
467	siginfo_t *info = pinfo;
468	struct ucontext *uc = puc;
469	unsigned long pc;
470	int is_write;
471
472	pc = uc->uc_mcontext.gregs[16];
473	/* XXX: compute is_write */
474	is_write = 0;
475	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
476	is_write,
477	&uc->uc_sigmask, puc);
478	}
479
480	#elif defined(__ia64)
481
482	#ifndef __ISR_VALID
483	/* This ought to be in <bits/siginfo.h>... */
484	# define __ISR_VALID 1
485	#endif
486
487	int cpu_signal_handler(int host_signum, void pinfo, void puc)
488	{
489	siginfo_t *info = pinfo;
490	struct ucontext *uc = puc;
491	unsigned long ip;
492	int is_write = 0;
493
494	ip = uc->uc_mcontext.sc_ip;
495	switch (host_signum) {
496	case SIGILL:
497	case SIGFPE:
498	case SIGSEGV:
499	case SIGBUS:
500	case SIGTRAP:
501	if (info->si_code && (info->si_segvflags & __ISR_VALID)) {
502	/* ISR.W (write-access) is bit 33: */
503	is_write = (info->si_isr >> 33) & 1;
504	}
505	break;
506
507	default:
508	break;
509	}
510	return handle_cpu_signal(ip, (unsigned long)info->si_addr,
511	is_write,
512	(sigset_t *)&uc->uc_sigmask, puc);
513	}
514
515	#elif defined(__s390__)
516
517	int cpu_signal_handler(int host_signum, void *pinfo,
518	void *puc)
519	{
520	siginfo_t *info = pinfo;
521	struct ucontext *uc = puc;
522	unsigned long pc;
523	uint16_t *pinsn;
524	int is_write = 0;
525
526	pc = uc->uc_mcontext.psw.addr;
527
528	/* ??? On linux, the non-rt signal handler has 4 (!) arguments instead
529	of the normal 2 arguments. The 3rd argument contains the "int_code"
530	from the hardware which does in fact contain the is_write value.
531	The rt signal handler, as far as I can tell, does not give this value
532	at all. Not that we could get to it from here even if it were. */
533	/* ??? This is not even close to complete, since it ignores all
534	of the read-modify-write instructions. */
535	pinsn = (uint16_t *)pc;
536	switch (pinsn[0] >> 8) {
537	case 0x50: /* ST */
538	case 0x42: /* STC */
539	case 0x40: /* STH */
540	is_write = 1;
541	break;
542	case 0xc4: /* RIL format insns */
543	switch (pinsn[0] & 0xf) {
544	case 0xf: /* STRL */
545	case 0xb: /* STGRL */
546	case 0x7: /* STHRL */
547	is_write = 1;
548	}
549	break;
550	case 0xe3: /* RXY format insns */
551	switch (pinsn[2] & 0xff) {
552	case 0x50: /* STY */
553	case 0x24: /* STG */
554	case 0x72: /* STCY */
555	case 0x70: /* STHY */
556	case 0x8e: /* STPQ */
557	case 0x3f: /* STRVH */
558	case 0x3e: /* STRV */
559	case 0x2f: /* STRVG */
560	is_write = 1;
561	}
562	break;
563	}
564	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
565	is_write, &uc->uc_sigmask, puc);
566	}
567
568	#elif defined(__mips__)
569
570	int cpu_signal_handler(int host_signum, void *pinfo,
571	void *puc)
572	{
573	siginfo_t *info = pinfo;
574	struct ucontext *uc = puc;
575	greg_t pc = uc->uc_mcontext.pc;
576	int is_write;
577
578	/* XXX: compute is_write */
579	is_write = 0;
580	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
581	is_write, &uc->uc_sigmask, puc);
582	}
583
584	#elif defined(__hppa__)
585
586	int cpu_signal_handler(int host_signum, void *pinfo,
587	void *puc)
588	{
589	struct siginfo *info = pinfo;
590	struct ucontext *uc = puc;
591	unsigned long pc = uc->uc_mcontext.sc_iaoq[0];
592	uint32_t insn = (uint32_t )pc;
593	int is_write = 0;
594
595	/* XXX: need kernel patch to get write flag faster. */
596	switch (insn >> 26) {
597	case 0x1a: /* STW */
598	case 0x19: /* STH */
599	case 0x18: /* STB */
600	case 0x1b: /* STWM */
601	is_write = 1;
602	break;
603
604	case 0x09: /* CSTWX, FSTWX, FSTWS */
605	case 0x0b: /* CSTDX, FSTDX, FSTDS */
606	/* Distinguish from coprocessor load ... */
607	is_write = (insn >> 9) & 1;
608	break;
609
610	case 0x03:
611	switch ((insn >> 6) & 15) {
612	case 0xa: /* STWS */
613	case 0x9: /* STHS */
614	case 0x8: /* STBS */
615	case 0xe: /* STWAS */
616	case 0xc: /* STBYS */
617	is_write = 1;
618	}
619	break;
620	}
621
622	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
623	is_write, &uc->uc_sigmask, puc);
624	}
625
626	#else
627
628	#error host CPU specific signal handler needed
629
630	#endif
631
632	#if defined(TARGET_I386)
633
634	void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector)
635	{
636	CPUX86State *saved_env;
637
638	saved_env = env;
639	env = s;
640	if (!(env->cr[0] & CR0_PE_MASK) \|\| (env->eflags & VM_MASK)) {
641	selector &= 0xffff;
642	cpu_x86_load_seg_cache(env, seg_reg, selector,
643	(selector << 4), 0xffff, 0);
644	} else {
645	helper_load_seg(seg_reg, selector);
646	}
647	env = saved_env;
648	}
649
650	void cpu_x86_fsave(CPUX86State *s, target_ulong ptr, int data32)
651	{
652	CPUX86State *saved_env;
653
654	saved_env = env;
655	env = s;
656
657	helper_fsave(ptr, data32);
658
659	env = saved_env;
660	}
661
662	void cpu_x86_frstor(CPUX86State *s, target_ulong ptr, int data32)
663	{
664	CPUX86State *saved_env;
665
666	saved_env = env;
667	env = s;
668
669	helper_frstor(ptr, data32);
670
671	env = saved_env;
672	}
673
674	#endif /* TARGET_I386 */