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"
#include "qemu/bitops.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)
{
    CPUState *cpu = ENV_GET_CPU(env1);

#if defined(TARGET_I386)
    raise_exception_err(env1, cpu->exception_index, env1->error_code);
#else
    cpu_loop_exit(cpu);
#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 *cpu, 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
    }
    cpu->exception_index = -1;
    siglongjmp(cpu->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)
{
    CPUState *cpu;
    CPUClass *cc;
    CPUArchState *env;
    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;
    }

    /* 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);
    env = cpu->env_ptr;
    /* 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 */
    cpu_restore_state(cpu, 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 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, puc);
}

#elif defined(__aarch64__)

int cpu_signal_handler(int host_signum, void *pinfo,
                       void *puc)
{
    siginfo_t *info = pinfo;
    struct ucontext *uc = puc;
    uint64_t pc;
    int is_write = 0; /* XXX how to determine? */

    pc = uc->uc_mcontext.pc;
    return handle_cpu_signal(pc, (uint64_t)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