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/*
 * This test causes and handles access violations/bus errors in 
   instructions that use the ebx register implicitly.
   The relevant instructions are cmpxchg8b and xlat (which uses ebx as
   a base register)
 */

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <setjmp.h>
#include <signal.h>
#include <errno.h>
#include <iostream>
#include <sstream>
#include <iomanip>
#include <fstream>
#include <cstdlib>
#ifdef TARGET_ANDROID
#include "android_ucontext.h"
#endif
using namespace std;

extern "C" unsigned int GetInstructionLenAndDisasm (unsigned char *ip, string *str);
extern "C" int TestAccessViolations();
extern "C" void InitXed();
int numExceptions = 0;

void PrintSignalContext(int sig, const siginfo_t *info, void *vctxt)
{
    ucontext_t *ctxt = (ucontext_t *)vctxt;
    unsigned long rip;
    long int trapno;

#if defined(TARGET_LINUX) && defined(TARGET_IA32E)
    rip = (unsigned long)ctxt->uc_mcontext.gregs[REG_RIP];
    trapno = (long int)ctxt->uc_mcontext.gregs[REG_TRAPNO];
#elif defined(TARGET_LINUX) && defined(TARGET_IA32)
    rip = (unsigned long)ctxt->uc_mcontext.gregs[REG_EIP];
    trapno = (long int)ctxt->uc_mcontext.gregs[REG_TRAPNO];
#elif defined(TARGET_MAC) && defined(TARGET_IA32E)
    rip = (unsigned long)ctxt->uc_mcontext->__ss.__rip;
    trapno = (long int)ctxt->uc_mcontext->__es.__trapno;
#elif defined(TARGET_MAC) && defined(TARGET_IA32)
    rip = (unsigned long)ctxt->uc_mcontext->__ss.__eip;
    trapno = (long int)ctxt->uc_mcontext->__es.__trapno;
#endif

    fprintf(stderr, "  PrintSignal: sig %d, pc=0x%lx, si_errno=%d, trap_no=%ld",
        sig,
        rip,
        (int)info->si_errno,
        trapno);

    fprintf(stderr, "\n");
}

static void Handle(int sig, siginfo_t *info, void *v)
{
    fprintf (stderr, "Handle\n");
    fflush (stderr);

    ucontext_t *ctxt = (ucontext_t *)v;

    PrintSignalContext(sig, info, v);
    numExceptions++;

    unsigned int * ipToContinueAt = (unsigned int *)
#if defined(TARGET_LINUX) && defined(TARGET_IA32)
        ctxt->uc_mcontext.gregs[REG_EIP];
#elif defined(TARGET_LINUX) && defined(TARGET_IA32E)
        ctxt->uc_mcontext.gregs[REG_RIP];
#elif defined(TARGET_MAC) && defined(TARGET_IA32)
        ctxt->uc_mcontext->__ss.__eip;
#elif defined(TARGET_MAC) && defined(TARGET_IA32E)
        ctxt->uc_mcontext->__ss.__rip;
#else
#error "Undefined code"
#endif
    string str;
    unsigned int instructionLen = GetInstructionLenAndDisasm((unsigned char *)ipToContinueAt, &str);
    if (0 == instructionLen)
    {
        fprintf (stderr, "***Error 0 length instruction at ip %p\n", ipToContinueAt);
        exit (1);
    }
    fprintf (stderr,"segv at: %s\n", str.c_str());
    ipToContinueAt 
        = (unsigned int *)((unsigned char *)ipToContinueAt + instructionLen);
    fprintf (stderr, " setting resume ip to %p\n", ipToContinueAt);
    instructionLen = GetInstructionLenAndDisasm((unsigned char *)ipToContinueAt, &str);
    if (0 == instructionLen)
    {
        fprintf (stderr, "***Error 0 length instruction at ip %p\n", ipToContinueAt);
        exit (1);
    }
    fprintf (stderr,"  resume instruction is %s\n", str.c_str());
#if defined(TARGET_LINUX) && defined(TARGET_IA32)
        ctxt->uc_mcontext.gregs[REG_EIP] =
#elif defined(TARGET_LINUX) && defined(TARGET_IA32E)
        ctxt->uc_mcontext.gregs[REG_RIP] =
#elif defined(TARGET_MAC) && defined(TARGET_IA32)
        ctxt->uc_mcontext->__ss.__eip =
#elif defined(TARGET_MAC) && defined(TARGET_IA32E)
        ctxt->uc_mcontext->__ss.__rip =
#else
#error "Undefined code"
#endif
                (unsigned long)(ipToContinueAt);

}



int main(int argc, char **argv)
{
    struct sigaction sigact;
 
    InitXed();
    sigact.sa_sigaction = Handle;
    sigemptyset(&sigact.sa_mask);
    sigact.sa_flags = SA_SIGINFO;
    if (sigaction(SIGSEGV, &sigact, 0) == -1)
    {
        fprintf(stderr, "Unable handle SIGSEGV\n");
        return 1;
    }
    if (sigaction(SIGBUS, &sigact, 0) == -1)
    {
        fprintf(stderr, "Unable handle SIGBUS\n");
        return 1;
    }

    fprintf (stderr, "calling TestAccessViolations\n");
    int retVal = TestAccessViolations();

    if (!retVal || numExceptions!=3)
    {
        fprintf (stderr, "***Error\n");
        exit (1);
    }
    
}





