// vim:shiftwidth=2:expandtab
#include <stdio.h>
-#include <string.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <sys/mman.h>
-#include <unistd.h>
#include "header.h"
#include "sys_cacheflush.h"
-#define strace(...)
+#include "override.c"
+
+// note: first mask must be always full for search algo
+static const unsigned int sig_mask_all[] = {
+ 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff,
+ 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff
+};
static const unsigned int sig_open[] = {
0xe59cc000, 0xe33c0000, 0x1a000003, 0xef900005
};
+#define sig_mask_open sig_mask_all
static const unsigned int sig_mmap[] = {
0xe92d000f, 0xe1a0000d, 0xef90005a, 0xe28dd010
};
+#define sig_mask_mmap sig_mask_all
-static const unsigned int sig_mmap_[] = {
+static const unsigned int sig_mmap2[] = {
0xe52d5004, 0xe59d5008, 0xe52d4004, 0xe59d4008,
0xe1b0ca05, 0x1a000006, 0xe1a05625, 0xef9000c0
};
+#define sig_mask_mmap2 sig_mask_all
static const unsigned int sig_read[] = {
0xe59fc080, 0xe59cc000, 0xe33c0000, 0x1a000003, 0xef900003
};
+#define sig_mask_read sig_mask_all
-#define FAKE_DEVMEM_DEVICE 10001
-#define FAKE_DEVGPIO_DEVICE 10002
-
-static int w_open(const char *pathname, int flags, mode_t mode)
-{
- int ret;
- if (strcmp(pathname, "/dev/mem") == 0)
- ret = FAKE_DEVMEM_DEVICE;
- else if (strcmp(pathname, "/dev/GPIO") == 0)
- ret = FAKE_DEVGPIO_DEVICE;
- else
- ret = open(pathname, flags, mode);
-
- strace("open(%s) = %d\n", pathname, ret);
- return ret;
-}
-
-static void *w_mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
-{
- void *ret;
- if (fd != FAKE_DEVMEM_DEVICE)
- ret = mmap(addr, length, prot, flags, fd, offset);
- else
- ret = emu_mmap_dev(length, prot, flags, offset);
-
- strace("mmap(%p, %x, %x, %x, %d, %lx) = %p\n", addr, length, prot, flags, fd, (long)offset, ret);
- return ret;
-}
-#define w_mmap_ w_mmap
+static const unsigned int sig_ioctl[] = {
+ 0xef900036, 0xe3700a01, 0x312fff1e
+};
+#define sig_mask_ioctl sig_mask_all
-ssize_t w_read(int fd, void *buf, size_t count)
-{
- ssize_t ret;
- if (fd != FAKE_DEVGPIO_DEVICE)
- return read(fd, buf, count);
+static const unsigned int sig_sigaction[] = {
+ 0xe59f300c, 0xe3530000, 0x0a000000, 0xea000000, 0xea000000
+};
+static const unsigned int sig_mask_sigaction[] = {
+ 0xffffffff, 0xffffffff, 0xffffffff, 0xff000000, 0xff000000
+};
- ret = emu_read_gpiodev(buf, count);
- //printf("read(%d, %p, %d) = %d\n", fd, buf, count, ret);
- return ret;
-}
-#define PATCH(f) { sig_##f, ARRAY_SIZE(sig_##f), w_##f }
+#define PATCH(f) { sig_##f, sig_mask_##f, ARRAY_SIZE(sig_##f), w_##f }
static const struct {
const unsigned int *sig;
+ const unsigned int *sig_mask;
size_t sig_cnt;
void *func;
} patches[] = {
PATCH(open),
PATCH(mmap),
- PATCH(mmap_), // mmap using mmap2 syscall
+ PATCH(mmap2), // mmap2 syscall
PATCH(read),
+ PATCH(ioctl),
+ PATCH(sigaction),
};
void do_patches(void *ptr, unsigned int size)
for (i = 0; i < ARRAY_SIZE(patches); i++) {
const unsigned int *sig = patches[i].sig;
+ const unsigned int *sig_mask = patches[i].sig_mask;
unsigned int *seg = (void *)(((long)ptr + 3) & ~3);
unsigned int *seg_end = seg + size / 4;
unsigned int sig0 = sig[0];
continue;
for (s = 1; s < patches[i].sig_cnt; s++)
- if (seg[s] != sig[s])
+ if ((seg[s] ^ sig[s]) & sig_mask[s])
break;
if (s == patches[i].sig_cnt)
continue;
found:
- printf(" patch #%i @ %08x\n", i, (int)seg);
+ dbg(" patch #%i @ %08x\n", i, (int)seg);
seg[0] = 0xe59ff000; // ldr pc, [pc]
seg[1] = 0;
seg[2] = (unsigned int)patches[i].func;