[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 "disas/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(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

    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
    }
    env1->exception_index = -1;
    siglongjmp(env1->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)
{
    int ret;

#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(cpu_single_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 */
    cpu_restore_state(cpu_single_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(cpu_single_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 defined(__GLIBC__) && (__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)
{
    siginfo_t *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	20	#include "cpu.h"
76cad711	21	#include "disas/disas.h"
42a623c7 BS	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
9349b4f9	40	static void exception_action(CPUArchState *env1)
1162c041	41	{
42a623c7	42	#if defined(TARGET_I386)
77b2bc2c	43	raise_exception_err(env1, 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	*/
9349b4f9	52	void cpu_resume_from_signal(CPUArchState env1, void puc)
42a623c7 BS	53	{
	54	#ifdef __linux__
	55	struct ucontext *uc = puc;
	56	#elif defined(__OpenBSD__)
	57	struct sigcontext *uc = puc;
	58	#endif
	59
42a623c7 BS	60	if (puc) {
	61	/* XXX: use siglongjmp ? */
	62	#ifdef __linux__
	63	#ifdef __ia64
	64	sigprocmask(SIG_SETMASK, (sigset_t *)&uc->uc_sigmask, NULL);
	65	#else
	66	sigprocmask(SIG_SETMASK, &uc->uc_sigmask, NULL);
	67	#endif
	68	#elif defined(__OpenBSD__)
	69	sigprocmask(SIG_SETMASK, &uc->sc_mask, NULL);
	70	#endif
	71	}
1846ec2c	72	env1->exception_index = -1;
6ab7e546	73	siglongjmp(env1->jmp_env, 1);
42a623c7 BS	74	}
	75
	76	/* 'pc' is the host PC at which the exception was raised. 'address' is
	77	the effective address of the memory exception. 'is_write' is 1 if a
	78	write caused the exception and otherwise 0'. 'old_set' is the
	79	signal set which should be restored */
20503968	80	static inline int handle_cpu_signal(uintptr_t pc, unsigned long address,
42a623c7 BS	81	int is_write, sigset_t *old_set,
	82	void *puc)
	83	{
42a623c7 BS	84	int ret;
42a623c7 BS	85
42a623c7 BS	86	#if defined(DEBUG_SIGNAL)
	87	qemu_printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
	88	pc, address, is_write, (unsigned long )old_set);
	89	#endif
	90	/* XXX: locking issue */
c5954819 PM	91	if (is_write && h2g_valid(address)
c5954819 PM	92	&& page_unprotect(h2g(address), pc, puc)) {
42a623c7 BS	93	return 1;
	94	}
	95
	96	/* see if it is an MMU fault */
1846ec2c BS	97	ret = cpu_handle_mmu_fault(cpu_single_env, address, is_write,
1846ec2c BS	98	MMU_USER_IDX);
42a623c7 BS	99	if (ret < 0) {
	100	return 0; /* not an MMU fault */
	101	}
	102	if (ret == 0) {
	103	return 1; /* the MMU fault was handled without causing real CPU fault */
	104	}
	105	/* now we have a real cpu fault */
a8a826a3	106	cpu_restore_state(cpu_single_env, pc);
42a623c7 BS	107
	108	/* we restore the process signal mask as the sigreturn should
	109	do it (XXX: use sigsetjmp) */
	110	sigprocmask(SIG_SETMASK, old_set, NULL);
1846ec2c	111	exception_action(cpu_single_env);
42a623c7 BS	112
	113	/* never comes here */
	114	return 1;
	115	}
	116
	117	#if defined(__i386__)
	118
	119	#if defined(__APPLE__)
	120	#include <sys/ucontext.h>
	121
	122	#define EIP_sig(context) (((unsigned long )&(context)->uc_mcontext->ss.eip))
	123	#define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
	124	#define ERROR_sig(context) ((context)->uc_mcontext->es.err)
	125	#define MASK_sig(context) ((context)->uc_sigmask)
	126	#elif defined(__NetBSD__)
	127	#include <ucontext.h>
	128
	129	#define EIP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EIP])
	130	#define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
	131	#define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
	132	#define MASK_sig(context) ((context)->uc_sigmask)
	133	#elif defined(__FreeBSD__) \|\| defined(__DragonFly__)
	134	#include <ucontext.h>
	135
	136	#define EIP_sig(context) (((unsigned long )&(context)->uc_mcontext.mc_eip))
	137	#define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
	138	#define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
	139	#define MASK_sig(context) ((context)->uc_sigmask)
	140	#elif defined(__OpenBSD__)
	141	#define EIP_sig(context) ((context)->sc_eip)
	142	#define TRAP_sig(context) ((context)->sc_trapno)
	143	#define ERROR_sig(context) ((context)->sc_err)
	144	#define MASK_sig(context) ((context)->sc_mask)
	145	#else
	146	#define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
	147	#define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
	148	#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
	149	#define MASK_sig(context) ((context)->uc_sigmask)
	150	#endif
	151
	152	int cpu_signal_handler(int host_signum, void *pinfo,
	153	void *puc)
	154	{
	155	siginfo_t *info = pinfo;
	156	#if defined(__NetBSD__) \|\| defined(__FreeBSD__) \|\| defined(__DragonFly__)
	157	ucontext_t *uc = puc;
	158	#elif defined(__OpenBSD__)
	159	struct sigcontext *uc = puc;
	160	#else
	161	struct ucontext *uc = puc;
	162	#endif
	163	unsigned long pc;
	164	int trapno;
	165
	166	#ifndef REG_EIP
	167	/* for glibc 2.1 */
	168	#define REG_EIP EIP
	169	#define REG_ERR ERR
	170	#define REG_TRAPNO TRAPNO
	171	#endif
	172	pc = EIP_sig(uc);
	173	trapno = TRAP_sig(uc);
	174	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
	175	trapno == 0xe ?
176	(ERROR_sig(uc) >> 1) & 1 : 0,
177	&MASK_sig(uc), puc);
178	}
179
180	#elif defined(__x86_64__)
181
182	#ifdef __NetBSD__
183	#define PC_sig(context) _UC_MACHINE_PC(context)
184	#define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
185	#define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
186	#define MASK_sig(context) ((context)->uc_sigmask)
187	#elif defined(__OpenBSD__)
188	#define PC_sig(context) ((context)->sc_rip)
189	#define TRAP_sig(context) ((context)->sc_trapno)
190	#define ERROR_sig(context) ((context)->sc_err)
191	#define MASK_sig(context) ((context)->sc_mask)
192	#elif defined(__FreeBSD__) \|\| defined(__DragonFly__)
193	#include <ucontext.h>
194
195	#define PC_sig(context) (((unsigned long )&(context)->uc_mcontext.mc_rip))
196	#define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
197	#define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
198	#define MASK_sig(context) ((context)->uc_sigmask)
199	#else
200	#define PC_sig(context) ((context)->uc_mcontext.gregs[REG_RIP])
201	#define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
202	#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
203	#define MASK_sig(context) ((context)->uc_sigmask)
204	#endif
205
206	int cpu_signal_handler(int host_signum, void *pinfo,
207	void *puc)
208	{
209	siginfo_t *info = pinfo;
210	unsigned long pc;
211	#if defined(__NetBSD__) \|\| defined(__FreeBSD__) \|\| defined(__DragonFly__)
212	ucontext_t *uc = puc;
213	#elif defined(__OpenBSD__)
214	struct sigcontext *uc = puc;
215	#else
216	struct ucontext *uc = puc;
217	#endif
218
219	pc = PC_sig(uc);
220	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
221	TRAP_sig(uc) == 0xe ?
222	(ERROR_sig(uc) >> 1) & 1 : 0,
223	&MASK_sig(uc), puc);
224	}
225
226	#elif defined(_ARCH_PPC)
227
228	/***********************************************************************
229	* signal context platform-specific definitions
230	* From Wine
231	*/
232	#ifdef linux
233	/* All Registers access - only for local access */
234	#define REG_sig(reg_name, context) \
235	((context)->uc_mcontext.regs->reg_name)
236	/* Gpr Registers access */
237	#define GPR_sig(reg_num, context) REG_sig(gpr[reg_num], context)
238	/* Program counter */
239	#define IAR_sig(context) REG_sig(nip, context)
240	/* Machine State Register (Supervisor) */
241	#define MSR_sig(context) REG_sig(msr, context)
242	/* Count register */
243	#define CTR_sig(context) REG_sig(ctr, context)
244	/* User's integer exception register */
245	#define XER_sig(context) REG_sig(xer, context)
246	/* Link register */
247	#define LR_sig(context) REG_sig(link, context)
248	/* Condition register */
249	#define CR_sig(context) REG_sig(ccr, context)
250
251	/* Float Registers access */
252	#define FLOAT_sig(reg_num, context) \
253	(((double )((char )((context)->uc_mcontext.regs + 48 * 4)))[reg_num])
254	#define FPSCR_sig(context) \
255	((int )((char )((context)->uc_mcontext.regs + (48 + 32 2) * 4)))
256	/* Exception Registers access */
257	#define DAR_sig(context) REG_sig(dar, context)
258	#define DSISR_sig(context) REG_sig(dsisr, context)
259	#define TRAP_sig(context) REG_sig(trap, context)
260	#endif /* linux */
261
262	#if defined(__FreeBSD__) \|\| defined(__FreeBSD_kernel__)
263	#include <ucontext.h>
264	#define IAR_sig(context) ((context)->uc_mcontext.mc_srr0)
265	#define MSR_sig(context) ((context)->uc_mcontext.mc_srr1)
266	#define CTR_sig(context) ((context)->uc_mcontext.mc_ctr)
267	#define XER_sig(context) ((context)->uc_mcontext.mc_xer)
268	#define LR_sig(context) ((context)->uc_mcontext.mc_lr)
269	#define CR_sig(context) ((context)->uc_mcontext.mc_cr)
270	/* Exception Registers access */
271	#define DAR_sig(context) ((context)->uc_mcontext.mc_dar)
272	#define DSISR_sig(context) ((context)->uc_mcontext.mc_dsisr)
273	#define TRAP_sig(context) ((context)->uc_mcontext.mc_exc)
274	#endif /* __FreeBSD__\|\| __FreeBSD_kernel__ */
275
276	#ifdef __APPLE__
277	#include <sys/ucontext.h>
278	typedef struct ucontext SIGCONTEXT;
279	/* All Registers access - only for local access */
280	#define REG_sig(reg_name, context) \
281	((context)->uc_mcontext->ss.reg_name)
282	#define FLOATREG_sig(reg_name, context) \
283	((context)->uc_mcontext->fs.reg_name)
284	#define EXCEPREG_sig(reg_name, context) \
285	((context)->uc_mcontext->es.reg_name)
286	#define VECREG_sig(reg_name, context) \
287	((context)->uc_mcontext->vs.reg_name)
288	/* Gpr Registers access */
289	#define GPR_sig(reg_num, context) REG_sig(r##reg_num, context)
290	/* Program counter */
291	#define IAR_sig(context) REG_sig(srr0, context)
292	/* Machine State Register (Supervisor) */
293	#define MSR_sig(context) REG_sig(srr1, context)
294	#define CTR_sig(context) REG_sig(ctr, context)
295	/* Link register */
296	#define XER_sig(context) REG_sig(xer, context)
297	/* User's integer exception register */
298	#define LR_sig(context) REG_sig(lr, context)
299	/* Condition register */
300	#define CR_sig(context) REG_sig(cr, context)
301	/* Float Registers access */
302	#define FLOAT_sig(reg_num, context) \
303	FLOATREG_sig(fpregs[reg_num], context)
304	#define FPSCR_sig(context) \
305	((double)FLOATREG_sig(fpscr, context))
306	/* Exception Registers access */
307	/* Fault registers for coredump */
308	#define DAR_sig(context) EXCEPREG_sig(dar, context)
309	#define DSISR_sig(context) EXCEPREG_sig(dsisr, context)
310	/* number of powerpc exception taken */
311	#define TRAP_sig(context) EXCEPREG_sig(exception, context)
312	#endif /* __APPLE__ */
313
314	int cpu_signal_handler(int host_signum, void *pinfo,
315	void *puc)
316	{
317	siginfo_t *info = pinfo;
318	#if defined(__FreeBSD__) \|\| defined(__FreeBSD_kernel__)
319	ucontext_t *uc = puc;
320	#else
321	struct ucontext *uc = puc;
322	#endif
323	unsigned long pc;
324	int is_write;
325
326	pc = IAR_sig(uc);
327	is_write = 0;
328	#if 0
329	/* ppc 4xx case */
330	if (DSISR_sig(uc) & 0x00800000) {
331	is_write = 1;
332	}
333	#else
334	if (TRAP_sig(uc) != 0x400 && (DSISR_sig(uc) & 0x02000000)) {
335	is_write = 1;
336	}
337	#endif
338	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
339	is_write, &uc->uc_sigmask, puc);
340	}
341
342	#elif defined(__alpha__)
343
344	int cpu_signal_handler(int host_signum, void *pinfo,
345	void *puc)
346	{
347	siginfo_t *info = pinfo;
348	struct ucontext *uc = puc;
349	uint32_t *pc = uc->uc_mcontext.sc_pc;
350	uint32_t insn = *pc;
351	int is_write = 0;
352
353	/* XXX: need kernel patch to get write flag faster */
354	switch (insn >> 26) {
355	case 0x0d: /* stw */
356	case 0x0e: /* stb */
357	case 0x0f: /* stq_u */
358	case 0x24: /* stf */
359	case 0x25: /* stg */
360	case 0x26: /* sts */
361	case 0x27: /* stt */
362	case 0x2c: /* stl */
363	case 0x2d: /* stq */
364	case 0x2e: /* stl_c */
365	case 0x2f: /* stq_c */
366	is_write = 1;
367	}
368
369	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
370	is_write, &uc->uc_sigmask, puc);
371	}
372	#elif defined(__sparc__)
373
374	int cpu_signal_handler(int host_signum, void *pinfo,
375	void *puc)
376	{
377	siginfo_t *info = pinfo;
378	int is_write;
379	uint32_t insn;
380	#if !defined(__arch64__) \|\| defined(CONFIG_SOLARIS)
381	uint32_t regs = (uint32_t )(info + 1);
382	void *sigmask = (regs + 20);
383	/* XXX: is there a standard glibc define ? */
384	unsigned long pc = regs[1];
385	#else
386	#ifdef __linux__
387	struct sigcontext *sc = puc;
388	unsigned long pc = sc->sigc_regs.tpc;
389	void sigmask = (void )sc->sigc_mask;
390	#elif defined(__OpenBSD__)
391	struct sigcontext *uc = puc;
392	unsigned long pc = uc->sc_pc;
393	void sigmask = (void )(long)uc->sc_mask;
394	#endif
395	#endif
396
397	/* XXX: need kernel patch to get write flag faster */
398	is_write = 0;
399	insn = (uint32_t )pc;
400	if ((insn >> 30) == 3) {
401	switch ((insn >> 19) & 0x3f) {
402	case 0x05: /* stb */
403	case 0x15: /* stba */
404	case 0x06: /* sth */
405	case 0x16: /* stha */
406	case 0x04: /* st */
407	case 0x14: /* sta */
408	case 0x07: /* std */
409	case 0x17: /* stda */
410	case 0x0e: /* stx */
411	case 0x1e: /* stxa */
412	case 0x24: /* stf */
413	case 0x34: /* stfa */
414	case 0x27: /* stdf */
415	case 0x37: /* stdfa */
416	case 0x26: /* stqf */
417	case 0x36: /* stqfa */
418	case 0x25: /* stfsr */
419	case 0x3c: /* casa */
420	case 0x3e: /* casxa */
421	is_write = 1;
422	break;
423	}
424	}
425	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
426	is_write, sigmask, NULL);
427	}
428
429	#elif defined(__arm__)
430
431	int cpu_signal_handler(int host_signum, void *pinfo,
432	void *puc)
433	{
434	siginfo_t *info = pinfo;
435	struct ucontext *uc = puc;
436	unsigned long pc;
437	int is_write;
438
e12cdb1b	439	#if defined(__GLIBC__) && (__GLIBC__ < 2 \|\| (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
42a623c7 BS	440	pc = uc->uc_mcontext.gregs[R15];
	441	#else
	442	pc = uc->uc_mcontext.arm_pc;
	443	#endif
	444	/* XXX: compute is_write */
	445	is_write = 0;
	446	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
	447	is_write,
	448	&uc->uc_sigmask, puc);
	449	}
	450
	451	#elif defined(__mc68000)
	452
	453	int cpu_signal_handler(int host_signum, void *pinfo,
	454	void *puc)
	455	{
	456	siginfo_t *info = pinfo;
	457	struct ucontext *uc = puc;
	458	unsigned long pc;
	459	int is_write;
	460
	461	pc = uc->uc_mcontext.gregs[16];
	462	/* XXX: compute is_write */
	463	is_write = 0;
	464	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
	465	is_write,
	466	&uc->uc_sigmask, puc);
	467	}
	468
	469	#elif defined(__ia64)
	470
	471	#ifndef __ISR_VALID
	472	/* This ought to be in <bits/siginfo.h>... */
	473	# define __ISR_VALID 1
	474	#endif
	475
	476	int cpu_signal_handler(int host_signum, void pinfo, void puc)
	477	{
	478	siginfo_t *info = pinfo;
	479	struct ucontext *uc = puc;
	480	unsigned long ip;
	481	int is_write = 0;
	482
	483	ip = uc->uc_mcontext.sc_ip;
	484	switch (host_signum) {
	485	case SIGILL:
	486	case SIGFPE:
	487	case SIGSEGV:
	488	case SIGBUS:
	489	case SIGTRAP:
	490	if (info->si_code && (info->si_segvflags & __ISR_VALID)) {
	491	/* ISR.W (write-access) is bit 33: */
	492	is_write = (info->si_isr >> 33) & 1;
	493	}
	494	break;
	495
	496	default:
	497	break;
	498	}
	499	return handle_cpu_signal(ip, (unsigned long)info->si_addr,
	500	is_write,
	501	(sigset_t *)&uc->uc_sigmask, puc);
	502	}
	503
504	#elif defined(__s390__)
505
506	int cpu_signal_handler(int host_signum, void *pinfo,
507	void *puc)
508	{
509	siginfo_t *info = pinfo;
510	struct ucontext *uc = puc;
511	unsigned long pc;
512	uint16_t *pinsn;
513	int is_write = 0;
514
515	pc = uc->uc_mcontext.psw.addr;
516
517	/* ??? On linux, the non-rt signal handler has 4 (!) arguments instead
518	of the normal 2 arguments. The 3rd argument contains the "int_code"
519	from the hardware which does in fact contain the is_write value.
520	The rt signal handler, as far as I can tell, does not give this value
521	at all. Not that we could get to it from here even if it were. */
522	/* ??? This is not even close to complete, since it ignores all
523	of the read-modify-write instructions. */
524	pinsn = (uint16_t *)pc;
525	switch (pinsn[0] >> 8) {
526	case 0x50: /* ST */
527	case 0x42: /* STC */
528	case 0x40: /* STH */
529	is_write = 1;
530	break;
531	case 0xc4: /* RIL format insns */
532	switch (pinsn[0] & 0xf) {
533	case 0xf: /* STRL */
534	case 0xb: /* STGRL */
535	case 0x7: /* STHRL */
536	is_write = 1;
537	}
538	break;
539	case 0xe3: /* RXY format insns */
540	switch (pinsn[2] & 0xff) {
541	case 0x50: /* STY */
542	case 0x24: /* STG */
543	case 0x72: /* STCY */
544	case 0x70: /* STHY */
545	case 0x8e: /* STPQ */
546	case 0x3f: /* STRVH */
547	case 0x3e: /* STRV */
548	case 0x2f: /* STRVG */
549	is_write = 1;
550	}
551	break;
552	}
553	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
554	is_write, &uc->uc_sigmask, puc);
555	}
556
557	#elif defined(__mips__)
558
559	int cpu_signal_handler(int host_signum, void *pinfo,
560	void *puc)
561	{
562	siginfo_t *info = pinfo;
563	struct ucontext *uc = puc;
564	greg_t pc = uc->uc_mcontext.pc;
565	int is_write;
566
567	/* XXX: compute is_write */
568	is_write = 0;
569	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
570	is_write, &uc->uc_sigmask, puc);
571	}
572
573	#elif defined(__hppa__)
574
575	int cpu_signal_handler(int host_signum, void *pinfo,
576	void *puc)
577	{
02d2bd5d	578	siginfo_t *info = pinfo;
42a623c7 BS	579	struct ucontext *uc = puc;
	580	unsigned long pc = uc->uc_mcontext.sc_iaoq[0];
	581	uint32_t insn = (uint32_t )pc;
	582	int is_write = 0;
	583
	584	/* XXX: need kernel patch to get write flag faster. */
	585	switch (insn >> 26) {
	586	case 0x1a: /* STW */
	587	case 0x19: /* STH */
	588	case 0x18: /* STB */
	589	case 0x1b: /* STWM */
	590	is_write = 1;
	591	break;
	592
	593	case 0x09: /* CSTWX, FSTWX, FSTWS */
	594	case 0x0b: /* CSTDX, FSTDX, FSTDS */
	595	/* Distinguish from coprocessor load ... */
	596	is_write = (insn >> 9) & 1;
	597	break;
	598
	599	case 0x03:
	600	switch ((insn >> 6) & 15) {
	601	case 0xa: /* STWS */
	602	case 0x9: /* STHS */
	603	case 0x8: /* STBS */
	604	case 0xe: /* STWAS */
	605	case 0xc: /* STBYS */
	606	is_write = 1;
	607	}
	608	break;
	609	}
	610
	611	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
	612	is_write, &uc->uc_sigmask, puc);
	613	}
	614
	615	#else
	616
	617	#error host CPU specific signal handler needed
	618
	619	#endif