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/*! @file CoverageReaderQEMU.cc
* @brief CoverageReaderQEMU Implementation
*
* This file contains the implementation of the functions supporting
* reading the QEMU coverage data files.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include "app_common.h"
#include "CoverageReaderQEMU.h"
#include "CoverageMap.h"
#include "ExecutableInfo.h"
#include "qemu-traces.h"
/* hack so this can compile on old Linux versions and FreeBSD */
#if (__GNUC__ <= 2) || defined(__FreeBSD__)
#define OPEN fopen
#else
#define OPEN fopen64
#endif
namespace Coverage {
CoverageReaderQEMU::CoverageReaderQEMU()
{
BranchInfoAvailable = true;
}
CoverageReaderQEMU::~CoverageReaderQEMU()
{
}
void CoverageReaderQEMU::processFile(
const char* const file,
ExecutableInfo* const executableInformation
)
{
struct trace_header header;
uintptr_t i;
int status;
FILE* traceFile;
uint8_t taken;
uint8_t notTaken;
uint8_t branchInfo;
taken = TargetInfo->qemuTakenBit();
notTaken = TargetInfo->qemuNotTakenBit();
branchInfo = taken | notTaken;
//
// Open the coverage file and read the header.
//
traceFile = OPEN( file, "r" );
if (!traceFile) {
fprintf(
stderr,
"ERROR: CoverageReaderQEMU::processFile - Unable to open %s\n",
file
);
exit( -1 );
}
status = fread( &header, sizeof(trace_header), 1, traceFile );
if (status != 1) {
fprintf(
stderr,
"ERROR: CoverageReaderQEMU::processFile - "
"Unable to read header from %s\n",
file
);
exit( -1 );
}
#if 0
fprintf(
stderr,
"magic = %s\n"
"version = %d\n"
"kind = %d\n"
"sizeof_target_pc = %d\n"
"big_endian = %d\n"
"machine = %02x:%02x\n",
header.magic,
header.version,
header.kind,
header.sizeof_target_pc,
header.big_endian,
header.machine[0], header.machine[1]
);
#endif
//
// Read ENTRIES number of trace entries.
//
#define ENTRIES 1024
while (1) {
CoverageMapBase *aCoverageMap = NULL;
struct trace_entry entries[ENTRIES];
struct trace_entry *entry;
int num_entries;
// Read and process each line of the coverage file.
num_entries = fread(
entries,
sizeof(struct trace_entry),
ENTRIES,
traceFile
);
if (num_entries == 0)
break;
// Get the coverage map for each entry. Note that the map is
// the same for each entry in the coverage map
for (int count=0; count<num_entries; count++) {
entry = &entries[count];
// Mark block as fully executed.
// Obtain the coverage map containing the specified address.
aCoverageMap = executableInformation->getCoverageMap( entry->pc );
// Ensure that coverage map exists.
if (!aCoverageMap)
continue;
// Set was executed for each TRACE_OP_BLOCK
if (entry->op & TRACE_OP_BLOCK) {
for (i=0; i<entry->size; i++) {
aCoverageMap->setWasExecuted( entry->pc + i );
}
}
// Determine if additional branch information is available.
if ( (entry->op & branchInfo) != 0 ) {
uint32_t offset_e, offset_a;
uint32_t a = entry->pc + entry->size - 1;
if ((aCoverageMap->determineOffset( a, &offset_a ) != true) ||
(aCoverageMap->determineOffset( entry->pc, &offset_e ) != true))
{
fprintf(
stderr,
"*** Trace block is inconsistent with coverage map\n"
"*** Trace block (0x%08x - 0x%08x) for %d bytes\n"
"*** Coverage map XXX \n",
entry->pc,
a,
entry->size
);
} else {
while (!aCoverageMap->isStartOfInstruction(a))
a--;
if (entry->op & taken) {
aCoverageMap->setWasTaken( a );
} else if (entry->op & notTaken) {
aCoverageMap->setWasNotTaken( a );
}
}
}
}
}
fclose( traceFile );
}
}
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