// agcc dump.c -o dump
// adb push dump /data/local/tmp/dump
// adb shell su -c '/data/local/tmp/dump' > dump.bin

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/mman.h>

#define SRAM_BASE 0x40000000
#define SRAM_SIZE 0x00100000

int main(int argc, char *argv) {
	int fd = open("/dev/mem", O_RDONLY);
	if (fd < 0) {
		perror("/dev/mem");
		exit(-1);
	}

	unsigned char *map_base;
	map_base = mmap(0, SRAM_SIZE, PROT_READ, MAP_SHARED, fd, (off_t)SRAM_BASE);
	if (map_base == MAP_FAILED) {
		perror("mmap failed");
		exit(-1);
	}

	write(1, map_base + 0x14000, 0x7000);

	munmap(map_base, SRAM_SIZE);
	close(fd);
	return 0;
}