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/******************************************************************************
* Copyright (c) 2013 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:
* Claudio Fontana (Linaro) - initial implementation
* based on Peter Maydell's risu_arm.c
*****************************************************************************/
#include <stdio.h>
#include <ucontext.h>
#include <string.h>
#include "risu.h"
#include "risu_reginfo_aarch64.h"
struct reginfo master_ri, apprentice_ri;
uint8_t apprentice_memblock[MEMBLOCKLEN];
static int mem_used = 0;
static int packet_mismatch = 0;
void advance_pc(void *vuc)
{
ucontext_t *uc = vuc;
uc->uc_mcontext.pc += 4;
}
static void set_x0(void *vuc, uint64_t x0)
{
ucontext_t *uc = vuc;
uc->uc_mcontext.regs[0] = x0;
}
static int get_risuop(uint32_t insn)
{
/* Return the risuop we have been asked to do
* (or -1 if this was a SIGILL for a non-risuop insn)
*/
uint32_t op = insn & 0xf;
uint32_t key = insn & ~0xf;
uint32_t risukey = 0x00005af0;
return (key != risukey) ? -1 : op;
}
int send_register_info(int sock, void *uc)
{
struct reginfo ri;
int op;
reginfo_init(&ri, uc);
op = get_risuop(ri.faulting_insn);
switch (op) {
case OP_COMPARE:
case OP_TESTEND:
default:
/* Do a simple register compare on (a) explicit request
* (b) end of test (c) a non-risuop UNDEF
*/
return send_data_pkt(sock, &ri, sizeof(ri));
case OP_SETMEMBLOCK:
memblock = (void *)ri.regs[0];
break;
case OP_GETMEMBLOCK:
set_x0(uc, ri.regs[0] + (uintptr_t)memblock);
break;
case OP_COMPAREMEM:
return send_data_pkt(sock, memblock, MEMBLOCKLEN);
break;
}
return 0;
}
/* 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.
*
* We don't have any kind of identifying info in the incoming data
* that says whether it is register or memory data, so if the two
* sides get out of sync then we will fail obscurely.
*/
int recv_and_compare_register_info(int sock, void *uc)
{
int resp = 0, op;
reginfo_init(&master_ri, uc);
op = get_risuop(master_ri.faulting_insn);
switch (op) {
case OP_COMPARE:
case OP_TESTEND:
default:
/* Do a simple register compare on (a) explicit request
* (b) end of test (c) a non-risuop UNDEF
*/
if (recv_data_pkt(sock, &apprentice_ri, sizeof(apprentice_ri))) {
packet_mismatch = 1;
resp = 2;
} else if (!reginfo_is_eq(&master_ri, &apprentice_ri)) {
/* register mismatch */
resp = 2;
} else if (op == OP_TESTEND) {
resp = 1;
}
send_response_byte(sock, resp);
break;
case OP_SETMEMBLOCK:
memblock = (void *)master_ri.regs[0];
break;
case OP_GETMEMBLOCK:
set_x0(uc, master_ri.regs[0] + (uintptr_t)memblock);
break;
case OP_COMPAREMEM:
mem_used = 1;
if (recv_data_pkt(sock, apprentice_memblock, MEMBLOCKLEN)) {
packet_mismatch = 1;
resp = 2;
} else if (memcmp(memblock, apprentice_memblock, MEMBLOCKLEN) != 0) {
/* memory mismatch */
resp = 2;
}
send_response_byte(sock, resp);
break;
}
return resp;
}
/* 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)
{
int resp = 0;
fprintf(stderr, "match status...\n");
if (packet_mismatch) {
fprintf(stderr, "packet mismatch (probably disagreement "
"about UNDEF on load/store)\n");
/* We don't have valid reginfo from the apprentice side
* so stop now rather than printing anything about it.
*/
fprintf(stderr, "master reginfo:\n");
reginfo_dump(&master_ri, stderr);
return 1;
}
if (memcmp(&master_ri, &apprentice_ri, sizeof(master_ri)) != 0)
{
fprintf(stderr, "mismatch on regs!\n");
resp = 1;
}
if (mem_used && memcmp(memblock, &apprentice_memblock, MEMBLOCKLEN) != 0) {
fprintf(stderr, "mismatch on memory!\n");
resp = 1;
}
if (!resp) {
fprintf(stderr, "match!\n");
return 0;
}
fprintf(stderr, "master reginfo:\n");
reginfo_dump(&master_ri, stderr);
fprintf(stderr, "apprentice reginfo:\n");
reginfo_dump(&apprentice_ri, stderr);
reginfo_dump_mismatch(&master_ri, &apprentice_ri, stderr);
return resp;
}
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