c0bd4173aa
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26893 a1c6a512-1295-4272-9138-f99709370657
132 lines
3.3 KiB
C
132 lines
3.3 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdint.h>
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#define ULONG uint32_t
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#define USHORT uint16_t
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#define UCHAR uint8_t
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ULONG isdata[1000000]; /* each bit defines one byte as: code=0, data=1 */
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extern void dis_asm(ULONG off, ULONG val, char *stg);
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int static inline le2int(unsigned char* buf)
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{
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int32_t res = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
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return res;
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}
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int main(int argc, char **argv)
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{
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FILE *in, *out;
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char *ptr, stg[256];
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unsigned char buf[4];
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ULONG pos, sz, val, loop;
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int offset, offset1;
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USHORT regid;
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if(argc == 1 || strcmp(argv[1], "--help") == 0)
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{ printf("Usage: arm_disass [input file]\n");
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printf(" disassembles input file to 'disasm.txt'\n");
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exit(-1);
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}
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in = fopen(argv[1], "rb");
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if(in == NULL)
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{ printf("Cannot open %s", argv[1]);
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exit(-1);
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}
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out = fopen("disasm.txt", "w");
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if(out == NULL) exit(-1);
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fseek(in, 0, SEEK_END);
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sz = ftell(in);
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/* first loop only sets data/code tags */
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for(loop=0; loop<2; loop++)
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{
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for(pos=0; pos<sz; pos+=4)
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{
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/* clear disassembler string start */
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memset(stg, 0, 40);
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/* read next code dword */
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fseek(in, pos, SEEK_SET);
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fread(buf, 1, 4, in);
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val = le2int(buf);
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/* check for data tag set: if 1 byte out of 4 is marked => assume data */
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if((isdata[pos>>5] & (0xf << (pos & 31))) || (val & 0xffff0000) == 0)
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{
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sprintf(stg, "%6x: %08x", pos, val);
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}
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else
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{
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dis_asm(pos, val, stg);
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/* check for instant mov operation */
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if(memcmp(stg+17, "mov ", 4) == 0 && (ptr=strstr(stg, "0x")) != NULL)
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{
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regid = *(USHORT*)(stg+22);
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sscanf(ptr+2, "%x", &offset);
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if(ptr[-1] == '-')
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offset = -offset;
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}
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else
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/* check for add/sub operation */
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if((ptr=strstr(stg, "0x")) != NULL
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&& (memcmp(stg+17, "add ", 4) == 0 || memcmp(stg+17, "sub ", 4) == 0))
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{
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if(regid == *(USHORT*)(stg+22) && regid == *(USHORT*)(stg+26))
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{
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sscanf(ptr+2, "%x", &offset1);
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if(ptr[-1] == '-')
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offset1 = -offset1;
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if(memcmp(stg+17, "add ", 4) == 0) offset += offset1;
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else offset -= offset1;
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/* add result to disassembler string */
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sprintf(stg+strlen(stg), " <- 0x%x", offset);
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}
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else
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regid = 0;
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}
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else
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regid = 0;
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/* check for const data */
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if(memcmp(stg+26, "[pc, ", 5) == 0 && (ptr=strstr(stg, "0x")) != NULL)
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{
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sscanf(ptr+2, "%x", &offset);
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if(ptr[-1] == '-')
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offset = -offset;
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/* add data tag */
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isdata[(pos+offset+8)>>5] |= 1 << ((pos+offset+8) & 31);
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/* add const data to disassembler string */
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fseek(in, pos+offset+8, SEEK_SET);
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fread(&buf, 1, 4, in);
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offset = le2int(buf);
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sprintf(stg+strlen(stg), " <- 0x%x", offset);
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}
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}
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/* remove trailing spaces */
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while(stg[strlen(stg)-1] == 32)
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stg[strlen(stg)-1] = 0;
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if(loop == 1)
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fprintf(out, "%s\n", stg);
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}
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}
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fclose(in);
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return 0;
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}
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