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/* -*- mode: C; c-basic-offset: 3; -*- */
/*
This file is part of MemCheck, a heavyweight Valgrind tool for
detecting memory errors.
Copyright (C) 2012-2017 Florian Krohm
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
The GNU General Public License is contained in the file COPYING.
*/
#include <assert.h>
#include "memcheck.h" // VALGRIND_SET_VBITS
#include "vtest.h"
/* Return a completely initialised control block */
IRICB
new_iricb(const irop_t *op, test_data_t *data)
{
IRICB cb;
cb.op = op->op;
cb.result = (HWord)&data->result.value;
cb.opnd1 = (HWord)&data->opnds[0].value;
cb.opnd2 = (HWord)&data->opnds[1].value;
cb.opnd3 = (HWord)&data->opnds[2].value;
cb.opnd4 = (HWord)&data->opnds[3].value;
cb.t_result = data->result.type;
cb.t_opnd1 = data->opnds[0].type;
cb.t_opnd2 = data->opnds[1].type;
cb.t_opnd3 = data->opnds[2].type;
cb.t_opnd4 = data->opnds[3].type;
cb.rounding_mode = data->rounding_mode;
cb.num_operands = get_num_operands(op->op);
cb.immediate_index = op->immediate_index;
cb.immediate_type = op->immediate_type;
return cb;
}
/* Ity_I1 values cannot be stored or loaded. So vex_inject_ir will load/store
such a value from/to a 4-byte container. It uses 32to1 and 1Uto32,
respectively. */
static void
valgrind_set_vbits(opnd_t *opnd)
{
unsigned rc, num_bytes;
/* 1-bit wide values cannot be read. So we read a 4 bytes here */
num_bytes = opnd->type == Ity_I1 ? 4 : sizeof_irtype(opnd->type);
rc = VALGRIND_SET_VBITS(&opnd->value, &opnd->vbits.bits, num_bytes);
assert(rc == 1);
// Make sure the v-bits were set correctly
vbits_t actual = { .num_bits = opnd->vbits.num_bits };
rc = VALGRIND_GET_VBITS(&opnd->value, &actual.bits, num_bytes);
assert(rc == 1);
assert(equal_vbits(opnd->vbits, actual));
}
static void
valgrind_get_vbits(opnd_t *opnd)
{
unsigned rc, num_bytes;
/* 1-bit wide values cannot be stored. So we store them by writing a
single byte */
num_bytes = opnd->type == Ity_I1 ? 4 : sizeof_irtype(opnd->type);
opnd->vbits.num_bits = bitsof_irtype(opnd->type);
rc = VALGRIND_GET_VBITS(&opnd->value, &opnd->vbits.bits, num_bytes);
assert(rc == 1);
}
/* Insert a client request that will initialize VEX for IR injection */
void
valgrind_vex_init_for_iri(IRICB *cb)
{
VALGRIND_DO_CLIENT_REQUEST_STMT(VG_USERREQ__VEX_INIT_FOR_IRI, cb, 0,0,0,0);
}
/* Insert a special opcode that will cause VEX to inject an IR stmt based
on the information passed in the IRICB (in valgrind_vex_init_for_iri). */
static void
valgrind_vex_inject_ir(void)
{
VALGRIND_VEX_INJECT_IR();
}
/* Execute the test under valgrind. Well, yes, we're not really executing
it here, just preparing for it... */
void
valgrind_execute_test(const irop_t *op, test_data_t *data)
{
unsigned i, num_operands;
if (verbose > 2) printf("---------- Running a test\n");
num_operands = get_num_operands(op->op);
for (i = 0; i < num_operands; ++i) {
valgrind_set_vbits(&data->opnds[i]);
if (verbose > 2) {
printf("opnd #%u: ", i);
print_opnd(stdout, &data->opnds[i]);
printf("\n");
}
}
if (verbose > 2)
if (data->rounding_mode != NO_ROUNDING_MODE)
printf("rounding mode %u\n", data->rounding_mode);
valgrind_vex_inject_ir();
valgrind_get_vbits(&data->result);
if (verbose > 2) {
printf("result: ");
print_opnd(stdout, &data->result);
printf("\n");
}
// Now that we have the vbits recorded, clear all the vbits.
for (i = 0; i < num_operands; ++i) {
VALGRIND_MAKE_MEM_DEFINED(&data->opnds[i].value, sizeof(data->opnds[i].value));
}
}
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