M8 android dump内存工具

#include <stdio.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <stdlib.h> #include <unistd.h> #include <sys/mman.h> unsigned long phystart, length, pagecnt, virtstart; volatile unsigned long *virtptr; char *ultoa(unsigned long num, char *str, int radix) { char sign = 0; char temp[33]; //an int can only be 32 bits long //at radix 2 (binary) the string //is at most 16 + 1 null long. int temp_loc = 0; int digit; int str_loc = 0; //save sign for radix 10 conversion if (radix == 10 && num < 0) { sign = 1; num = -num; } //construct a backward string of the number. do { digit = num % radix; if (digit < 10) temp[temp_loc++] = digit + '0'; else temp[temp_loc++] = digit - 10 + 'A'; num /= radix; } while (num > 0); //now add the sign for radix 10 if (radix == 10 && sign) { temp[temp_loc] = '-'; } else { temp_loc--; } //now reverse the string. while ( temp_loc >=0 ) {// while there are still chars str[str_loc++] = temp[temp_loc--]; } str[str_loc] = 0; // add null termination. return str; } int main(int argc, char *argv[]) { unsigned long physend, i, j; int fd; char buf1[33], buf2[33]; phystart = strtoul(argv[1], NULL, 16); length = strtoul(argv[2], NULL, 16); physend = phystart + length - 1; pagecnt = ((physend - phystart) >> 12) + 1; fd = open("/dev/mem", O_RDWR|O_SYNC); if(fd<0){ printf("Error open /dev/mem!"); return -1; } virtstart = (unsigned long)mmap(NULL, 4096 * pagecnt, PROT_READ, MAP_SHARED, fd, phystart&~0x00000fff); if(virtstart<0){ printf("Unable to mmap %08x!\n", phystart); return -1; } virtptr = (unsigned long*)(virtstart + (phystart&0x00000fff)); for (i=phystart; i<physend; i+=4) { printf("0x%08X(%08X) ", i, *virtptr); memset(buf2, 0, 33); ultoa(*virtptr, buf1, 2); memset(buf2, '0', 32 - strlen(buf1)); strcat(buf2, buf1); for (j=0; j<32; j+=4) { printf("%c%c%c%c ", buf2[j], buf2[j+1], buf2[j+2], buf2[j+3]); } printf("\n"); virtptr++; } munmap(virtstart, 4096 * pagecnt); close(fd); return 0; }