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- #include <stdio.h>
- #include <stdlib.h>
- #include <time.h>
- static FILE *f;
- #define bswap16(x) (x=(unsigned short)((x<<8)|(x>>8)))
- #define bswap32(x) (x=((x<<24)|((x<<8)&0xff0000)|((x>>8)&0x00ff00)|((unsigned)x>>24)))
- static void write_op(unsigned short op, unsigned short word0, unsigned short word1, unsigned short word2)
- {
- bswap16(op);
- bswap16(word0);
- bswap16(word1);
- bswap16(word2);
- fwrite(&op, 1, sizeof(op), f);
- fwrite(&word0, 1, sizeof(word0), f);
- fwrite(&word1, 1, sizeof(word1), f);
- fwrite(&word2, 1, sizeof(word2), f);
- }
- static void write32(unsigned int a)
- {
- bswap32(a);
- fwrite(&a, 1, sizeof(a), f);
- }
- static int op_check(unsigned short op)
- {
- if ((op&0xf000) == 0x6000) return 0; // Bxx
- if ((op&0xf0f8) == 0x50c8) return 0; // DBxx
- if ((op&0xff80) == 0x4e80) return 0; // Jsr
- if ((op&0xf000) == 0xa000) return 0; // a-line
- if ((op&0xf000) == 0xf000) return 0; // f-line
- if ((op&0xfff8)==0x4e70&&op!=0x4e71&&op!=0x4e76) return 0; // reset, rte, rts
- if ((op&0x3f) >= 0x28) op = (op&~0x3f) | (rand() % 0x28);
- return 1;
- }
- static unsigned short safe_rand(void)
- {
- unsigned short op;
- /* avoid branch opcodes */
- do
- {
- op = rand();
- }
- while (!op_check(op));
- return op;
- }
- int main()
- {
- int i, op;
- srand(time(0));
- f = fopen("test_misc2.bin", "wb");
- if (!f) return 1;
- write32(0x00ff8000); // stack
- write32(0x300); // IP
- for (i=0x100/4-2; i; i--)
- {
- write32(0x200+i*4); // exception vectors
- }
- for (i=0x100/4; i; i--)
- {
- write32(0); // pad
- }
- for (i=0x100/4; i; i--)
- {
- write32(0x4e734e73); // fill with rte instructions
- }
- for (op = 0; op < 0x10000; op++)
- {
- if ((op&0xf000) == 0x6000) // Bxx
- {
- if ((op&0x00ff) == 0)
- write_op(op, 6, 0, 0);
- }
- else if ((op&0xf0f8)==0x50c8) // DBxx
- {
- write_op(op, 6, 0, 0);
- }
- else if ((op&0xff80)==0x4e80) // Jsr
- {
- int addr = 0x300 + op*8 + 8;
- if ((op&0x3f) == 0x39)
- write_op(op, addr >> 16, addr & 0xffff, 0);
- }
- else if ((op&0xf000)==0xa000 || (op&0xf000)==0xf000) // a-line, f-line
- {
- if (op != 0xa000 && op != 0xf000) continue;
- }
- else if ((op&0xfff8)==0x4e70&&op!=0x4e71&&op!=0x4e76); // rte, rts, stop, reset
- else
- {
- write_op(op, safe_rand(), safe_rand(), safe_rand());
- }
- }
- // jump to the beginning
- write_op(0x4ef8, 0x300, 0x4ef8, 0x300);
- write_op(0x4ef8, 0x300, 0x4ef8, 0x300);
- fclose(f);
- return 0;
- }
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