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/*******************************************************************************
* Copyright (c) 2010 Linaro Limited
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Peter Maydell (Linaro) - initial implementation
*******************************************************************************/
#include <stdio.h>
#include <ucontext.h>
#include <string.h>
#include "risu.h"
/* This is the data structure we pass over the socket.
* It is a simplified and reduced subset of what can
* be obtained with a ucontext_t*
*/
struct reginfo
{
uint32_t faulting_insn;
gregset_t gregs;
};
#ifndef REG_GS
/* Assume that either we get all these defines or none */
#define REG_GS 0
#define REG_FS 1
#define REG_ES 2
#define REG_DS 3
#define REG_ESP 7
#define REG_TRAPNO 12
#define REG_EIP 14
#define REG_EFL 16
#define REG_UESP 17
#endif
struct reginfo master_ri, apprentice_ri;
static int insn_is_ud2(uint32_t insn)
{
return ((insn & 0xffff) == 0x0b0f);
}
void advance_pc(void *vuc)
{
/* We assume that this is either UD1 or UD2.
* This would need tweaking if we want to test
* expected undefs on x86.
*/
ucontext_t *uc = vuc;
uc->uc_mcontext.gregs[REG_EIP] += 2;
}
static void fill_reginfo(struct reginfo *ri, ucontext_t *uc)
{
int i;
for (i = 0; i < NGREG; i++)
{
switch(i)
{
case REG_ESP:
case REG_UESP:
case REG_GS:
case REG_FS:
case REG_ES:
case REG_DS:
case REG_TRAPNO:
case REG_EFL:
/* Don't store these registers as it results in mismatches.
* In particular valgrind has different values for some
* segment registers, and they're boring anyway.
* We really shouldn't be ignoring EFL but valgrind doesn't
* seem to set it right and I don't care to investigate.
*/
ri->gregs[i] = 0xDEADBEEF;
break;
case REG_EIP:
/* Store the offset from the start of the test image */
ri->gregs[i] = uc->uc_mcontext.gregs[i] - image_start_address;
break;
default:
ri->gregs[i] = uc->uc_mcontext.gregs[i];
break;
}
}
/* x86 insns aren't 32 bit but we're not really testing x86 so
* this is just to distinguish 'do compare' from 'stop'
*/
ri->faulting_insn = *((uint32_t*)uc->uc_mcontext.gregs[REG_EIP]);
}
int send_register_info(int sock, void *uc)
{
struct reginfo ri;
fill_reginfo(&ri, uc);
return send_data_pkt(sock, &ri, sizeof(ri));
}
/* Read register info from the socket and compare it with that from the
* ucontext. Return 0 for match, 1 for end-of-test, 2 for mismatch.
* NB: called from a signal handler.
*/
int recv_and_compare_register_info(int sock, void *uc)
{
int resp;
fill_reginfo(&master_ri, uc);
recv_data_pkt(sock, &apprentice_ri, sizeof(apprentice_ri));
if (memcmp(&master_ri, &apprentice_ri, sizeof(master_ri)) != 0)
{
/* mismatch */
resp = 2;
}
else if (insn_is_ud2(master_ri.faulting_insn))
{
/* end of test */
resp = 1;
}
else
{
/* either successful match or expected undef */
resp = 0;
}
send_response_byte(sock, resp);
return resp;
}
static char *regname[] =
{
"GS", "FS", "ES" ,"DS", "EDI", "ESI", "EBP", "ESP",
"EBX", "EDX", "ECX", "EAX", "TRAPNO", "ERR", "EIP",
"CS", "EFL", "UESP", "SS", 0
};
static void dump_reginfo(struct reginfo *ri)
{
int i;
fprintf(stderr, " faulting insn %x\n", ri->faulting_insn);
for (i = 0; i < NGREG; i++)
{
fprintf(stderr, " %s: %x\n", regname[i] ? regname[i] : "???", ri->gregs[i]);
}
}
/* Print a useful report on the status of the last comparison
* done in recv_and_compare_register_info(). This is called on
* exit, so need not restrict itself to signal-safe functions.
* Should return 0 if it was a good match (ie end of test)
* and 1 for a mismatch.
*/
int report_match_status(void)
{
fprintf(stderr, "match status...\n");
fprintf(stderr, "master reginfo:\n");
dump_reginfo(&master_ri);
fprintf(stderr, "apprentice reginfo:\n");
dump_reginfo(&apprentice_ri);
if (memcmp(&master_ri, &apprentice_ri, sizeof(master_ri)) == 0)
{
fprintf(stderr, "match!\n");
return 0;
}
fprintf(stderr, "mismatch!\n");
return 1;
}
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