| 1 | #include <stdio.h> |
| 2 | #include <stdlib.h> |
| 3 | #include <time.h> |
| 4 | |
| 5 | |
| 6 | static FILE *f; |
| 7 | |
| 8 | #define bswap16(x) (x=(unsigned short)((x<<8)|(x>>8))) |
| 9 | #define bswap32(x) (x=((x<<24)|((x<<8)&0xff0000)|((x>>8)&0x00ff00)|((unsigned)x>>24))) |
| 10 | |
| 11 | static void write_op(unsigned short op, unsigned short word0, unsigned short word1, unsigned short word2) |
| 12 | { |
| 13 | bswap16(op); |
| 14 | bswap16(word0); |
| 15 | bswap16(word1); |
| 16 | bswap16(word2); |
| 17 | |
| 18 | fwrite(&op, 1, sizeof(op), f); |
| 19 | fwrite(&word0, 1, sizeof(word0), f); |
| 20 | fwrite(&word1, 1, sizeof(word1), f); |
| 21 | fwrite(&word2, 1, sizeof(word2), f); |
| 22 | } |
| 23 | |
| 24 | static void write32(unsigned int a) |
| 25 | { |
| 26 | bswap32(a); |
| 27 | fwrite(&a, 1, sizeof(a), f); |
| 28 | } |
| 29 | |
| 30 | static int op_check(unsigned short op) |
| 31 | { |
| 32 | if ((op&0xf000) == 0x6000) return 0; // Bxx |
| 33 | if ((op&0xf0f8) == 0x50c8) return 0; // DBxx |
| 34 | if ((op&0xff80) == 0x4e80) return 0; // Jsr |
| 35 | if ((op&0xf000) == 0xa000) return 0; // a-line |
| 36 | if ((op&0xf000) == 0xf000) return 0; // f-line |
| 37 | if ((op&0xfff8)==0x4e70&&op!=0x4e71&&op!=0x4e76) return 0; // reset, rte, rts |
| 38 | |
| 39 | if ((op&0x3f) >= 0x28) op = (op&~0x3f) | (rand() % 0x28); |
| 40 | return 1; |
| 41 | } |
| 42 | |
| 43 | static unsigned short safe_rand(void) |
| 44 | { |
| 45 | unsigned short op; |
| 46 | |
| 47 | /* avoid branch opcodes */ |
| 48 | do |
| 49 | { |
| 50 | op = rand(); |
| 51 | } |
| 52 | while (!op_check(op)); |
| 53 | |
| 54 | return op; |
| 55 | } |
| 56 | |
| 57 | int main() |
| 58 | { |
| 59 | int i, op; |
| 60 | |
| 61 | srand(time(0)); |
| 62 | |
| 63 | f = fopen("test_misc2.bin", "wb"); |
| 64 | if (!f) return 1; |
| 65 | |
| 66 | write32(0x00ff8000); // stack |
| 67 | write32(0x300); // IP |
| 68 | |
| 69 | for (i=0x100/4-2; i; i--) |
| 70 | { |
| 71 | write32(0x200+i*4); // exception vectors |
| 72 | } |
| 73 | |
| 74 | for (i=0x100/4; i; i--) |
| 75 | { |
| 76 | write32(0); // pad |
| 77 | } |
| 78 | |
| 79 | for (i=0x100/4; i; i--) |
| 80 | { |
| 81 | write32(0x4e734e73); // fill with rte instructions |
| 82 | } |
| 83 | |
| 84 | for (op = 0; op < 0x10000; op++) |
| 85 | { |
| 86 | if ((op&0xf000) == 0x6000) // Bxx |
| 87 | { |
| 88 | if ((op&0x00ff) == 0) |
| 89 | write_op(op, 6, 0, 0); |
| 90 | } |
| 91 | else if ((op&0xf0f8)==0x50c8) // DBxx |
| 92 | { |
| 93 | write_op(op, 6, 0, 0); |
| 94 | } |
| 95 | else if ((op&0xff80)==0x4e80) // Jsr |
| 96 | { |
| 97 | int addr = 0x300 + op*8 + 8; |
| 98 | if ((op&0x3f) == 0x39) |
| 99 | write_op(op, addr >> 16, addr & 0xffff, 0); |
| 100 | } |
| 101 | else if ((op&0xf000)==0xa000 || (op&0xf000)==0xf000) // a-line, f-line |
| 102 | { |
| 103 | if (op != 0xa000 && op != 0xf000) continue; |
| 104 | } |
| 105 | else if ((op&0xfff8)==0x4e70&&op!=0x4e71&&op!=0x4e76); // rte, rts, stop, reset |
| 106 | else |
| 107 | { |
| 108 | write_op(op, safe_rand(), safe_rand(), safe_rand()); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | // jump to the beginning |
| 113 | write_op(0x4ef8, 0x300, 0x4ef8, 0x300); |
| 114 | write_op(0x4ef8, 0x300, 0x4ef8, 0x300); |
| 115 | |
| 116 | fclose(f); |
| 117 | return 0; |
| 118 | } |
| 119 | |