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/******************************************************************************
* Copyright (c) 2017 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 <string.h>
#include "risu.h"
struct reginfo master_ri, apprentice_ri;
uint8_t apprentice_memblock[MEMBLOCKLEN];
static int mem_used;
static int packet_mismatch;
int send_register_info(write_fn write_fn, void *uc)
{
struct reginfo ri;
trace_header_t header;
int op;
reginfo_init(&ri, uc);
op = get_risuop(&ri);
/* Write a header with PC/op to keep in sync */
header.pc = get_pc(&ri);
header.risu_op = op;
if (write_fn(&header, sizeof(header)) != 0) {
return -1;
}
switch (op) {
case OP_TESTEND:
write_fn(&ri, sizeof(ri));
/* if we are tracing write_fn will return 0 unlike a remote
end, hence we force return of 1 here */
return 1;
case OP_SETMEMBLOCK:
memblock = (void *)(uintptr_t)get_reginfo_paramreg(&ri);
break;
case OP_GETMEMBLOCK:
set_ucontext_paramreg(uc,
get_reginfo_paramreg(&ri) + (uintptr_t)memblock);
break;
case OP_COMPAREMEM:
return write_fn(memblock, MEMBLOCKLEN);
break;
case OP_COMPARE:
default:
/* Do a simple register compare on (a) explicit request
* (b) end of test (c) a non-risuop UNDEF
*/
return write_fn(&ri, sizeof(ri));
}
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(read_fn read_fn,
respond_fn resp_fn, void *uc)
{
int resp = 0, op;
trace_header_t header;
reginfo_init(&master_ri, uc);
op = get_risuop(&master_ri);
if (read_fn(&header, sizeof(header)) != 0) {
return -1;
}
if (header.risu_op != op) {
/* We are out of sync */
resp = 2;
resp_fn(resp);
return resp;
}
/* send OK for the header */
resp_fn(0);
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 (read_fn(&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;
}
resp_fn(resp);
break;
case OP_SETMEMBLOCK:
memblock = (void *)(uintptr_t)get_reginfo_paramreg(&master_ri);
break;
case OP_GETMEMBLOCK:
set_ucontext_paramreg(uc, get_reginfo_paramreg(&master_ri) +
(uintptr_t)memblock);
break;
case OP_COMPAREMEM:
mem_used = 1;
if (read_fn(apprentice_memblock, MEMBLOCKLEN)) {
packet_mismatch = 1;
resp = 2;
} else if (memcmp(memblock, apprentice_memblock, MEMBLOCKLEN) != 0) {
/* memory mismatch */
resp = 2;
}
resp_fn(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(int trace)
{
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, "%s reginfo:\n", trace ? "this" : "master");
reginfo_dump(&master_ri, stderr);
return 1;
}
if (!reginfo_is_eq(&master_ri, &apprentice_ri)) {
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, "%s reginfo:\n", trace ? "this" : "master");
reginfo_dump(&master_ri, stderr);
fprintf(stderr, "%s reginfo:\n", trace ? "trace" : "apprentice");
reginfo_dump(&apprentice_ri, stderr);
if (trace) {
reginfo_dump_mismatch(&apprentice_ri, &master_ri, stderr);
} else {
reginfo_dump_mismatch(&master_ri, &apprentice_ri, stderr);
}
return resp;
}
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