segatools/hooklib/spike.c

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#include <windows.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
#include "hook/pe.h"
#include "hooklib/spike.h"
#include "util/dprintf.h"
static void spike_hook_read_config(const wchar_t *spike_file);
/* Spike functions. Their "style" is named after the libc function they bear
the closest resemblance to. */
static void spike_fn_puts(const char *msg)
{
char line[512];
sprintf_s(line, _countof(line), "%s\n", msg);
OutputDebugStringA(line);
}
static void spike_fn_fputs(const char *msg)
{
OutputDebugStringA(msg);
}
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static void spike_fn_printf(const char *fmt, ...)
{
char line[512];
va_list ap;
va_start(ap, fmt);
vsprintf_s(line, _countof(line), fmt, ap);
strcat(line, "\n");
OutputDebugStringA(line);
}
static void spike_fn_vprintf(
const char *proc,
int line_no,
const char *fmt,
va_list ap)
{
char msg[512];
char line[512];
vsprintf_s(msg, _countof(msg), fmt, ap);
sprintf_s(line, _countof(line), "%s:%i: %s", proc, line_no, msg);
OutputDebugStringA(line);
}
static void spike_fn_vwprintf(
const wchar_t *proc,
int line_no,
const wchar_t *fmt,
va_list ap)
{
wchar_t msg[512];
wchar_t line[512];
vswprintf_s(msg, _countof(msg), fmt, ap);
swprintf_s(line, _countof(line), L"%s:%i: %s", proc, line_no, msg);
OutputDebugStringW(line);
}
static void spike_fn_perror(
int a1,
int a2,
int error,
const char *file,
int line_no,
const char *msg)
{
char line[512];
sprintf_s(
line,
_countof(line),
"%s:%i:%08x: %s\n",
file,
line_no,
error,
msg);
OutputDebugStringA(line);
}
/* Spike inserters */
static void spike_insert_jmp(ptrdiff_t rva, void *proc)
{
uint8_t *base;
uint8_t *target;
uint8_t *func_ptr;
uint32_t delta;
base = (uint8_t *) GetModuleHandleW(NULL);
target = base + rva;
func_ptr = proc;
delta = func_ptr - target - 4; /* -4: EIP delta, after end of target insn */
pe_patch(target, &delta, sizeof(delta));
}
static void spike_insert_ptr(ptrdiff_t rva, void *ptr)
{
uint8_t *base;
uint8_t *target;
base = (uint8_t *) GetModuleHandleW(NULL);
target = base + rva;
pe_patch(target, &ptr, sizeof(ptr));
}
static void spike_insert_log_levels(ptrdiff_t rva, size_t count)
{
uint8_t *base;
uint32_t *levels;
size_t i;
base = (uint8_t *) GetModuleHandleW(NULL);
levels = (uint32_t *) (base + rva);
for (i = 0 ; i < count ; i++) {
levels[i] = 255;
}
}
/* Config reader */
void spike_hook_init(const wchar_t *ini_file)
{
wchar_t module[MAX_PATH];
wchar_t path[MAX_PATH];
const wchar_t *basename;
const wchar_t *slash;
assert(ini_file != NULL);
/* Get the filename (strip path) of the host EXE */
GetModuleFileNameW(NULL, module, _countof(module));
slash = wcsrchr(module, L'\\');
if (slash != NULL) {
basename = slash + 1;
} else {
basename = module;
}
/* Check our INI file to see if any spikes are configured for this EXE.
Normally we separate out config reading into a separate module... */
GetPrivateProfileStringW(
L"spike",
basename,
L"",
path,
_countof(path),
ini_file);
if (path[0] != L'\0') {
dprintf("Spiking %S using config from %S\n", basename, path);
spike_hook_read_config(path);
}
}
static void spike_hook_read_config(const wchar_t *spike_file)
{
int match;
int count;
int rva;
char line[80];
char *ret;
FILE *f;
f = _wfopen(spike_file, L"r");
if (f == NULL) {
dprintf("Error opening spike file %S\n", spike_file);
return;
}
for (;;) {
ret = fgets(line, sizeof(line), f);
if (ret == NULL) {
break;
}
if (line[0] == '#' || line[0] == '\r' || line[0] == '\n') {
continue;
}
match = sscanf(line, "levels %i %i", &rva, &count);
if (match == 2) {
spike_insert_log_levels((ptrdiff_t) rva, count);
}
match = sscanf(line, "j_vprintf %i", &rva);
if (match == 1) {
spike_insert_jmp((ptrdiff_t) rva, spike_fn_vprintf);
}
match = sscanf(line, "j_vwprintf %i", &rva);
if (match == 1) {
spike_insert_jmp((ptrdiff_t) rva, spike_fn_vwprintf);
}
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match = sscanf(line, "j_printf %i", &rva);
if (match == 1) {
spike_insert_jmp((ptrdiff_t) rva, spike_fn_printf);
}
match = sscanf(line, "j_puts %i", &rva);
if (match == 1) {
spike_insert_jmp((ptrdiff_t) rva, spike_fn_puts);
}
match = sscanf(line, "j_perror %i", &rva);
if (match == 1) {
spike_insert_jmp((ptrdiff_t) rva, spike_fn_perror);
}
match = sscanf(line, "c_fputs %i", &rva); /* c == "callback" */
if (match == 1) {
spike_insert_ptr((ptrdiff_t) rva, spike_fn_fputs);
}
}
dprintf("Spike insertion complete\n");
fclose(f);
}