[mirror_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 "qemu/osdep.h"
#include "cpu.h"
#include "disas/disas.h"
#include "exec/exec-all.h"
#include "tcg.h"
#include "qemu/bitops.h"
#include "exec/cpu_ldst.h"
#include "translate-all.h"

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

//#define DEBUG_SIGNAL

/* exit the current TB from a signal handler. The host registers are
   restored in a state compatible with the CPU emulator
 */
static void cpu_exit_tb_from_sighandler(CPUState *cpu, sigset_t *old_set)
{
    /* XXX: use siglongjmp ? */
    sigprocmask(SIG_SETMASK, old_set, NULL);
    cpu_loop_exit_noexc(cpu);
}

/* '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)
{
    CPUState *cpu;
    CPUClass *cc;
    int ret;

#if defined(DEBUG_SIGNAL)
    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)) {
        switch (page_unprotect(h2g(address), pc)) {
        case 0:
            /* Fault not caused by a page marked unwritable to protect
             * cached translations, must be the guest binary's problem
             */
            break;
        case 1:
            /* Fault caused by protection of cached translation; TBs
             * invalidated, so resume execution
             */
            return 1;
        case 2:
            /* Fault caused by protection of cached translation, and the
             * currently executing TB was modified and must be exited
             * immediately.
             */
            cpu_exit_tb_from_sighandler(current_cpu, old_set);
            g_assert_not_reached();
        default:
            g_assert_not_reached();
        }
    }

    /* Convert forcefully to guest address space, invalid addresses
       are still valid segv ones */
    address = h2g_nocheck(address);

    cpu = current_cpu;
    cc = CPU_GET_CLASS(cpu);
    /* see if it is an MMU fault */
    g_assert(cc->handle_mmu_fault);
    ret = cc->handle_mmu_fault(cpu, 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.  Since this is the exact location of
     * the exception, we must undo the adjustment done by cpu_restore_state
     * for handling call return addresses.  */
    cpu_restore_state(cpu, pc + GETPC_ADJ);

    sigprocmask(SIG_SETMASK, old_set, NULL);
    cpu_loop_exit(cpu);

    /* never comes here */
    return 1;
}

#if defined(__i386__)

#if 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));
}

#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));
}

#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__ */

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);
}

#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);
}
#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;
#elif defined(__NetBSD__)
    ucontext_t *uc = puc;
    unsigned long pc = _UC_MACHINE_PC(uc);
    void *sigmask = (void *)&uc->uc_sigmask;
#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);
}

#elif defined(__arm__)

#if defined(__NetBSD__)
#include <ucontext.h>
#endif

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

#if defined(__NetBSD__)
    pc = uc->uc_mcontext.__gregs[_REG_R15];
#elif defined(__GLIBC__) && (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
    pc = uc->uc_mcontext.gregs[R15];
#else
    pc = uc->uc_mcontext.arm_pc;
#endif

    /* error_code is the FSR value, in which bit 11 is WnR (assuming a v6 or
     * later processor; on v5 we will always report this as a read).
     */
    is_write = extract32(uc->uc_mcontext.error_code, 11, 1);
    return handle_cpu_signal(pc, (unsigned long)info->si_addr,
                             is_write,
                             &uc->uc_sigmask);
}

#elif defined(__aarch64__)

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

    /* XXX: need kernel patch to get write flag faster.  */
    is_write = (   (insn & 0xbfff0000) == 0x0c000000   /* C3.3.1 */
                || (insn & 0xbfe00000) == 0x0c800000   /* C3.3.2 */
                || (insn & 0xbfdf0000) == 0x0d000000   /* C3.3.3 */
                || (insn & 0xbfc00000) == 0x0d800000   /* C3.3.4 */
                || (insn & 0x3f400000) == 0x08000000   /* C3.3.6 */
                || (insn & 0x3bc00000) == 0x39000000   /* C3.3.13 */
                || (insn & 0x3fc00000) == 0x3d800000   /* ... 128bit */
                /* Ingore bits 10, 11 & 21, controlling indexing.  */
                || (insn & 0x3bc00000) == 0x38000000   /* C3.3.8-12 */
                || (insn & 0x3fe00000) == 0x3c800000   /* ... 128bit */
                /* Ignore bits 23 & 24, controlling indexing.  */
                || (insn & 0x3a400000) == 0x28000000); /* C3.3.7,14-16 */

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

#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);
}

#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);
}

#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);
}

#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	*/
d38ea87a	19	#include "qemu/osdep.h"
3e457172	20	#include "cpu.h"
76cad711	21	#include "disas/disas.h"
63c91552	22	#include "exec/exec-all.h"
42a623c7	23	#include "tcg.h"
023b0ae3	24	#include "qemu/bitops.h"
f08b6170	25	#include "exec/cpu_ldst.h"
1652b974	26	#include "translate-all.h"
42a623c7 BS	27
	28	#undef EAX
	29	#undef ECX
	30	#undef EDX
	31	#undef EBX
	32	#undef ESP
	33	#undef EBP
	34	#undef ESI
	35	#undef EDI
	36	#undef EIP
42a623c7 BS	37	#ifdef __linux__
	38	#include <sys/ucontext.h>
	39	#endif
	40
	41	//#define DEBUG_SIGNAL
	42
42a623c7 BS	43	/* exit the current TB from a signal handler. The host registers are
	44	restored in a state compatible with the CPU emulator
	45	*/
a5852dc5	46	static void cpu_exit_tb_from_sighandler(CPUState cpu, sigset_t old_set)
42a623c7	47	{
f213e72f	48	/* XXX: use siglongjmp ? */
a5852dc5	49	sigprocmask(SIG_SETMASK, old_set, NULL);
6886b980	50	cpu_loop_exit_noexc(cpu);
42a623c7 BS	51	}
	52
	53	/* 'pc' is the host PC at which the exception was raised. 'address' is
	54	the effective address of the memory exception. 'is_write' is 1 if a
	55	write caused the exception and otherwise 0'. 'old_set' is the
	56	signal set which should be restored */
20503968	57	static inline int handle_cpu_signal(uintptr_t pc, unsigned long address,
a5852dc5	58	int is_write, sigset_t *old_set)
42a623c7	59	{
7510454e AF	60	CPUState *cpu;
7510454e AF	61	CPUClass *cc;
42a623c7 BS	62	int ret;
42a623c7 BS	63
42a623c7	64	#if defined(DEBUG_SIGNAL)
71baf787 PM	65	printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
71baf787 PM	66	pc, address, is_write, (unsigned long )old_set);
42a623c7 BS	67	#endif
42a623c7 BS	68	/* XXX: locking issue */
f213e72f PM	69	if (is_write && h2g_valid(address)) {
	70	switch (page_unprotect(h2g(address), pc)) {
	71	case 0:
	72	/* Fault not caused by a page marked unwritable to protect
	73	* cached translations, must be the guest binary's problem
	74	*/
	75	break;
	76	case 1:
	77	/* Fault caused by protection of cached translation; TBs
	78	* invalidated, so resume execution
	79	*/
	80	return 1;
	81	case 2:
	82	/* Fault caused by protection of cached translation, and the
	83	* currently executing TB was modified and must be exited
	84	* immediately.
	85	*/
a5852dc5	86	cpu_exit_tb_from_sighandler(current_cpu, old_set);
f213e72f PM	87	g_assert_not_reached();
	88	default:
	89	g_assert_not_reached();
	90	}
42a623c7 BS	91	}
42a623c7 BS	92
732f9e89 AG	93	/* Convert forcefully to guest address space, invalid addresses
	94	are still valid segv ones */
	95	address = h2g_nocheck(address);
	96
7510454e AF	97	cpu = current_cpu;
7510454e AF	98	cc = CPU_GET_CLASS(cpu);
42a623c7	99	/* see if it is an MMU fault */
7510454e AF	100	g_assert(cc->handle_mmu_fault);
7510454e AF	101	ret = cc->handle_mmu_fault(cpu, address, is_write, MMU_USER_IDX);
42a623c7 BS	102	if (ret < 0) {
	103	return 0; /* not an MMU fault */
	104	}
	105	if (ret == 0) {
	106	return 1; /* the MMU fault was handled without causing real CPU fault */
	107	}
01ecaf43 RH	108
	109	/* Now we have a real cpu fault. Since this is the exact location of
	110	* the exception, we must undo the adjustment done by cpu_restore_state
	111	* for handling call return addresses. */
	112	cpu_restore_state(cpu, pc + GETPC_ADJ);
42a623c7	113
42a623c7	114	sigprocmask(SIG_SETMASK, old_set, NULL);
0c33682d	115	cpu_loop_exit(cpu);
42a623c7 BS	116
	117	/* never comes here */
	118	return 1;
	119	}
	120
	121	#if defined(__i386__)
	122
c5679026	123	#if defined(__NetBSD__)
42a623c7 BS	124	#include <ucontext.h>
	125
	126	#define EIP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EIP])
	127	#define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
	128	#define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
	129	#define MASK_sig(context) ((context)->uc_sigmask)
	130	#elif defined(__FreeBSD__) \|\| defined(__DragonFly__)
	131	#include <ucontext.h>
	132
	133	#define EIP_sig(context) (((unsigned long )&(context)->uc_mcontext.mc_eip))
	134	#define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
	135	#define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
	136	#define MASK_sig(context) ((context)->uc_sigmask)
	137	#elif defined(__OpenBSD__)
	138	#define EIP_sig(context) ((context)->sc_eip)
	139	#define TRAP_sig(context) ((context)->sc_trapno)
	140	#define ERROR_sig(context) ((context)->sc_err)
	141	#define MASK_sig(context) ((context)->sc_mask)
	142	#else
	143	#define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
	144	#define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
	145	#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
	146	#define MASK_sig(context) ((context)->uc_sigmask)
	147	#endif
	148
	149	int cpu_signal_handler(int host_signum, void *pinfo,
	150	void *puc)
	151	{
	152	siginfo_t *info = pinfo;
	153	#if defined(__NetBSD__) \|\| defined(__FreeBSD__) \|\| defined(__DragonFly__)
	154	ucontext_t *uc = puc;
	155	#elif defined(__OpenBSD__)
	156	struct sigcontext *uc = puc;
	157	#else
	158	struct ucontext *uc = puc;
	159	#endif
	160	unsigned long pc;
	161	int trapno;
	162
	163	#ifndef REG_EIP
	164	/* for glibc 2.1 */
	165	#define REG_EIP EIP
	166	#define REG_ERR ERR
	167	#define REG_TRAPNO TRAPNO
	168	#endif
	169	pc = EIP_sig(uc);
	170	trapno = TRAP_sig(uc);
	171	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
	172	trapno == 0xe ?
	173	(ERROR_sig(uc) >> 1) & 1 : 0,
a5852dc5	174	&MASK_sig(uc));
42a623c7 BS	175	}
	176
	177	#elif defined(__x86_64__)
	178
	179	#ifdef __NetBSD__
	180	#define PC_sig(context) _UC_MACHINE_PC(context)
	181	#define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
	182	#define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
	183	#define MASK_sig(context) ((context)->uc_sigmask)
	184	#elif defined(__OpenBSD__)
	185	#define PC_sig(context) ((context)->sc_rip)
	186	#define TRAP_sig(context) ((context)->sc_trapno)
	187	#define ERROR_sig(context) ((context)->sc_err)
	188	#define MASK_sig(context) ((context)->sc_mask)
	189	#elif defined(__FreeBSD__) \|\| defined(__DragonFly__)
	190	#include <ucontext.h>
	191
	192	#define PC_sig(context) (((unsigned long )&(context)->uc_mcontext.mc_rip))
	193	#define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
	194	#define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
	195	#define MASK_sig(context) ((context)->uc_sigmask)
	196	#else
	197	#define PC_sig(context) ((context)->uc_mcontext.gregs[REG_RIP])
	198	#define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
	199	#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
	200	#define MASK_sig(context) ((context)->uc_sigmask)
	201	#endif
	202
	203	int cpu_signal_handler(int host_signum, void *pinfo,
	204	void *puc)
	205	{
	206	siginfo_t *info = pinfo;
	207	unsigned long pc;
	208	#if defined(__NetBSD__) \|\| defined(__FreeBSD__) \|\| defined(__DragonFly__)
	209	ucontext_t *uc = puc;
	210	#elif defined(__OpenBSD__)
	211	struct sigcontext *uc = puc;
	212	#else
	213	struct ucontext *uc = puc;
	214	#endif
	215
	216	pc = PC_sig(uc);
	217	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
	218	TRAP_sig(uc) == 0xe ?
	219	(ERROR_sig(uc) >> 1) & 1 : 0,
a5852dc5	220	&MASK_sig(uc));
42a623c7 BS	221	}
	222
	223	#elif defined(_ARCH_PPC)
	224
	225	/***********************************************************************
	226	* signal context platform-specific definitions
	227	* From Wine
	228	*/
	229	#ifdef linux
	230	/* All Registers access - only for local access */
	231	#define REG_sig(reg_name, context) \
	232	((context)->uc_mcontext.regs->reg_name)
	233	/* Gpr Registers access */
	234	#define GPR_sig(reg_num, context) REG_sig(gpr[reg_num], context)
	235	/* Program counter */
	236	#define IAR_sig(context) REG_sig(nip, context)
	237	/* Machine State Register (Supervisor) */
	238	#define MSR_sig(context) REG_sig(msr, context)
	239	/* Count register */
	240	#define CTR_sig(context) REG_sig(ctr, context)
	241	/* User's integer exception register */
	242	#define XER_sig(context) REG_sig(xer, context)
	243	/* Link register */
	244	#define LR_sig(context) REG_sig(link, context)
	245	/* Condition register */
	246	#define CR_sig(context) REG_sig(ccr, context)
	247
	248	/* Float Registers access */
	249	#define FLOAT_sig(reg_num, context) \
	250	(((double )((char )((context)->uc_mcontext.regs + 48 * 4)))[reg_num])
	251	#define FPSCR_sig(context) \
	252	((int )((char )((context)->uc_mcontext.regs + (48 + 32 2) * 4)))
	253	/* Exception Registers access */
	254	#define DAR_sig(context) REG_sig(dar, context)
	255	#define DSISR_sig(context) REG_sig(dsisr, context)
	256	#define TRAP_sig(context) REG_sig(trap, context)
	257	#endif /* linux */
	258
	259	#if defined(__FreeBSD__) \|\| defined(__FreeBSD_kernel__)
	260	#include <ucontext.h>
	261	#define IAR_sig(context) ((context)->uc_mcontext.mc_srr0)
	262	#define MSR_sig(context) ((context)->uc_mcontext.mc_srr1)
	263	#define CTR_sig(context) ((context)->uc_mcontext.mc_ctr)
	264	#define XER_sig(context) ((context)->uc_mcontext.mc_xer)
	265	#define LR_sig(context) ((context)->uc_mcontext.mc_lr)
	266	#define CR_sig(context) ((context)->uc_mcontext.mc_cr)
	267	/* Exception Registers access */
	268	#define DAR_sig(context) ((context)->uc_mcontext.mc_dar)
	269	#define DSISR_sig(context) ((context)->uc_mcontext.mc_dsisr)
	270	#define TRAP_sig(context) ((context)->uc_mcontext.mc_exc)
	271	#endif /* __FreeBSD__\|\| __FreeBSD_kernel__ */
	272
42a623c7 BS	273	int cpu_signal_handler(int host_signum, void *pinfo,
	274	void *puc)
	275	{
	276	siginfo_t *info = pinfo;
	277	#if defined(__FreeBSD__) \|\| defined(__FreeBSD_kernel__)
	278	ucontext_t *uc = puc;
	279	#else
	280	struct ucontext *uc = puc;
	281	#endif
	282	unsigned long pc;
	283	int is_write;
	284
	285	pc = IAR_sig(uc);
	286	is_write = 0;
	287	#if 0
	288	/* ppc 4xx case */
	289	if (DSISR_sig(uc) & 0x00800000) {
	290	is_write = 1;
	291	}
	292	#else
	293	if (TRAP_sig(uc) != 0x400 && (DSISR_sig(uc) & 0x02000000)) {
	294	is_write = 1;
	295	}
	296	#endif
	297	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
a5852dc5	298	is_write, &uc->uc_sigmask);
42a623c7 BS	299	}
	300
	301	#elif defined(__alpha__)
	302
	303	int cpu_signal_handler(int host_signum, void *pinfo,
	304	void *puc)
	305	{
	306	siginfo_t *info = pinfo;
	307	struct ucontext *uc = puc;
	308	uint32_t *pc = uc->uc_mcontext.sc_pc;
	309	uint32_t insn = *pc;
	310	int is_write = 0;
	311
	312	/* XXX: need kernel patch to get write flag faster */
	313	switch (insn >> 26) {
	314	case 0x0d: /* stw */
	315	case 0x0e: /* stb */
	316	case 0x0f: /* stq_u */
	317	case 0x24: /* stf */
	318	case 0x25: /* stg */
	319	case 0x26: /* sts */
	320	case 0x27: /* stt */
	321	case 0x2c: /* stl */
	322	case 0x2d: /* stq */
	323	case 0x2e: /* stl_c */
	324	case 0x2f: /* stq_c */
	325	is_write = 1;
	326	}
	327
	328	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
a5852dc5	329	is_write, &uc->uc_sigmask);
42a623c7 BS	330	}
	331	#elif defined(__sparc__)
	332
	333	int cpu_signal_handler(int host_signum, void *pinfo,
	334	void *puc)
	335	{
	336	siginfo_t *info = pinfo;
	337	int is_write;
	338	uint32_t insn;
	339	#if !defined(__arch64__) \|\| defined(CONFIG_SOLARIS)
	340	uint32_t regs = (uint32_t )(info + 1);
	341	void *sigmask = (regs + 20);
	342	/* XXX: is there a standard glibc define ? */
	343	unsigned long pc = regs[1];
	344	#else
	345	#ifdef __linux__
	346	struct sigcontext *sc = puc;
	347	unsigned long pc = sc->sigc_regs.tpc;
	348	void sigmask = (void )sc->sigc_mask;
	349	#elif defined(__OpenBSD__)
	350	struct sigcontext *uc = puc;
	351	unsigned long pc = uc->sc_pc;
	352	void sigmask = (void )(long)uc->sc_mask;
7ccfb495 TN	353	#elif defined(__NetBSD__)
	354	ucontext_t *uc = puc;
	355	unsigned long pc = _UC_MACHINE_PC(uc);
	356	void sigmask = (void )&uc->uc_sigmask;
42a623c7 BS	357	#endif
	358	#endif
	359
	360	/* XXX: need kernel patch to get write flag faster */
	361	is_write = 0;
	362	insn = (uint32_t )pc;
	363	if ((insn >> 30) == 3) {
	364	switch ((insn >> 19) & 0x3f) {
	365	case 0x05: /* stb */
	366	case 0x15: /* stba */
	367	case 0x06: /* sth */
	368	case 0x16: /* stha */
	369	case 0x04: /* st */
	370	case 0x14: /* sta */
	371	case 0x07: /* std */
	372	case 0x17: /* stda */
	373	case 0x0e: /* stx */
	374	case 0x1e: /* stxa */
	375	case 0x24: /* stf */
	376	case 0x34: /* stfa */
	377	case 0x27: /* stdf */
	378	case 0x37: /* stdfa */
	379	case 0x26: /* stqf */
	380	case 0x36: /* stqfa */
	381	case 0x25: /* stfsr */
	382	case 0x3c: /* casa */
	383	case 0x3e: /* casxa */
	384	is_write = 1;
	385	break;
	386	}
	387	}
	388	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
a5852dc5	389	is_write, sigmask);
42a623c7 BS	390	}
	391
	392	#elif defined(__arm__)
	393
7ccfb495 TN	394	#if defined(__NetBSD__)
	395	#include <ucontext.h>
	396	#endif
	397
42a623c7 BS	398	int cpu_signal_handler(int host_signum, void *pinfo,
	399	void *puc)
	400	{
	401	siginfo_t *info = pinfo;
7ccfb495 TN	402	#if defined(__NetBSD__)
	403	ucontext_t *uc = puc;
	404	#else
42a623c7	405	struct ucontext *uc = puc;
7ccfb495	406	#endif
42a623c7 BS	407	unsigned long pc;
	408	int is_write;
	409
7ccfb495 TN	410	#if defined(__NetBSD__)
	411	pc = uc->uc_mcontext.__gregs[_REG_R15];
	412	#elif defined(__GLIBC__) && (__GLIBC__ < 2 \|\| (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
42a623c7 BS	413	pc = uc->uc_mcontext.gregs[R15];
	414	#else
	415	pc = uc->uc_mcontext.arm_pc;
	416	#endif
023b0ae3 PM	417
	418	/* error_code is the FSR value, in which bit 11 is WnR (assuming a v6 or
	419	* later processor; on v5 we will always report this as a read).
	420	*/
	421	is_write = extract32(uc->uc_mcontext.error_code, 11, 1);
42a623c7 BS	422	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
42a623c7 BS	423	is_write,
a5852dc5	424	&uc->uc_sigmask);
42a623c7 BS	425	}
42a623c7 BS	426
f129061c CF	427	#elif defined(__aarch64__)
f129061c CF	428
661f7fa4	429	int cpu_signal_handler(int host_signum, void pinfo, void puc)
f129061c CF	430	{
	431	siginfo_t *info = pinfo;
	432	struct ucontext *uc = puc;
661f7fa4 RH	433	uintptr_t pc = uc->uc_mcontext.pc;
	434	uint32_t insn = (uint32_t )pc;
	435	bool is_write;
	436
	437	/* XXX: need kernel patch to get write flag faster. */
	438	is_write = ( (insn & 0xbfff0000) == 0x0c000000 /* C3.3.1 */
	439	\|\| (insn & 0xbfe00000) == 0x0c800000 /* C3.3.2 */
	440	\|\| (insn & 0xbfdf0000) == 0x0d000000 /* C3.3.3 */
	441	\|\| (insn & 0xbfc00000) == 0x0d800000 /* C3.3.4 */
	442	\|\| (insn & 0x3f400000) == 0x08000000 /* C3.3.6 */
	443	\|\| (insn & 0x3bc00000) == 0x39000000 /* C3.3.13 */
	444	\|\| (insn & 0x3fc00000) == 0x3d800000 /* ... 128bit */
	445	/* Ingore bits 10, 11 & 21, controlling indexing. */
	446	\|\| (insn & 0x3bc00000) == 0x38000000 /* C3.3.8-12 */
	447	\|\| (insn & 0x3fe00000) == 0x3c800000 /* ... 128bit */
	448	/* Ignore bits 23 & 24, controlling indexing. */
	449	\|\| (insn & 0x3a400000) == 0x28000000); /* C3.3.7,14-16 */
	450
	451	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
a5852dc5	452	is_write, &uc->uc_sigmask);
f129061c CF	453	}
f129061c CF	454
42a623c7 BS	455	#elif defined(__ia64)
	456
	457	#ifndef __ISR_VALID
	458	/* This ought to be in <bits/siginfo.h>... */
	459	# define __ISR_VALID 1
	460	#endif
	461
	462	int cpu_signal_handler(int host_signum, void pinfo, void puc)
	463	{
	464	siginfo_t *info = pinfo;
	465	struct ucontext *uc = puc;
	466	unsigned long ip;
	467	int is_write = 0;
	468
	469	ip = uc->uc_mcontext.sc_ip;
	470	switch (host_signum) {
	471	case SIGILL:
	472	case SIGFPE:
	473	case SIGSEGV:
	474	case SIGBUS:
	475	case SIGTRAP:
	476	if (info->si_code && (info->si_segvflags & __ISR_VALID)) {
	477	/* ISR.W (write-access) is bit 33: */
	478	is_write = (info->si_isr >> 33) & 1;
	479	}
	480	break;
	481
	482	default:
	483	break;
	484	}
	485	return handle_cpu_signal(ip, (unsigned long)info->si_addr,
	486	is_write,
a5852dc5	487	(sigset_t *)&uc->uc_sigmask);
42a623c7 BS	488	}
	489
	490	#elif defined(__s390__)
	491
	492	int cpu_signal_handler(int host_signum, void *pinfo,
	493	void *puc)
	494	{
	495	siginfo_t *info = pinfo;
	496	struct ucontext *uc = puc;
	497	unsigned long pc;
	498	uint16_t *pinsn;
	499	int is_write = 0;
	500
	501	pc = uc->uc_mcontext.psw.addr;
	502
	503	/* ??? On linux, the non-rt signal handler has 4 (!) arguments instead
	504	of the normal 2 arguments. The 3rd argument contains the "int_code"
	505	from the hardware which does in fact contain the is_write value.
	506	The rt signal handler, as far as I can tell, does not give this value
	507	at all. Not that we could get to it from here even if it were. */
	508	/* ??? This is not even close to complete, since it ignores all
	509	of the read-modify-write instructions. */
	510	pinsn = (uint16_t *)pc;
	511	switch (pinsn[0] >> 8) {
	512	case 0x50: /* ST */
	513	case 0x42: /* STC */
	514	case 0x40: /* STH */
	515	is_write = 1;
	516	break;
	517	case 0xc4: /* RIL format insns */
	518	switch (pinsn[0] & 0xf) {
	519	case 0xf: /* STRL */
	520	case 0xb: /* STGRL */
	521	case 0x7: /* STHRL */
	522	is_write = 1;
	523	}
	524	break;
	525	case 0xe3: /* RXY format insns */
	526	switch (pinsn[2] & 0xff) {
	527	case 0x50: /* STY */
	528	case 0x24: /* STG */
	529	case 0x72: /* STCY */
	530	case 0x70: /* STHY */
	531	case 0x8e: /* STPQ */
	532	case 0x3f: /* STRVH */
	533	case 0x3e: /* STRV */
	534	case 0x2f: /* STRVG */
	535	is_write = 1;
	536	}
	537	break;
	538	}
	539	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
a5852dc5	540	is_write, &uc->uc_sigmask);
42a623c7 BS	541	}
	542
	543	#elif defined(__mips__)
	544
	545	int cpu_signal_handler(int host_signum, void *pinfo,
	546	void *puc)
	547	{
	548	siginfo_t *info = pinfo;
	549	struct ucontext *uc = puc;
	550	greg_t pc = uc->uc_mcontext.pc;
	551	int is_write;
	552
	553	/* XXX: compute is_write */
	554	is_write = 0;
	555	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
a5852dc5	556	is_write, &uc->uc_sigmask);
42a623c7 BS	557	}
42a623c7 BS	558
42a623c7 BS	559	#else
	560
	561	#error host CPU specific signal handler needed
	562
	563	#endif