| 1 | struct exec { /* a.out header */ |
| 2 | int a_magic; /* magic number */ |
| 3 | unsigned a_text; /* size of text segment */ |
| 4 | unsigned a_data; /* size of initialized data */ |
| 5 | unsigned a_bss; /* size of unitialized data */ |
| 6 | unsigned a_syms; /* size of symbol table */ |
| 7 | unsigned a_entry; /* entry point */ |
| 8 | unsigned a_unused; /* not used */ |
| 9 | unsigned a_flag; /* relocation info stripped */ |
| 10 | }; |
| 11 | |
| 12 | #define A_MAGIC1 0407 /* normal */ |
| 13 | #define A_MAGIC2 0410 /* read-only text */ |
| 14 | #define A_MAGIC3 0411 /* separated I&D */ |
| 15 | #define A_MAGIC4 0405 /* overlay */ |
| 16 | |
| 17 | struct nlist { /* symbol table entry */ |
| 18 | char n_name[8]; /* symbol name */ |
| 19 | int n_type; /* type flag */ |
| 20 | unsigned n_value; /* value */ |
| 21 | }; |
| 22 | |
| 23 | /* values for type flag */ |
| 24 | #define N_UNDF 0 /* undefined */ |
| 25 | #define N_ABS 01 /* absolute */ |
| 26 | #define N_TEXT 02 /* text symbol */ |
| 27 | #define N_DATA 03 /* data symbol */ |
| 28 | #define N_BSS 04 /* bss symbol */ |
| 29 | #define N_TYPE 037 |
| 30 | #define N_REG 024 /* register name */ |
| 31 | #define N_FN 037 /* file name symbol */ |
| 32 | #define N_EXT 040 /* external bit, or'ed in */ |
| 33 | #define FORMAT "%06o" /* to print a value */ |