| 1 | /* |
|---|
| 2 | * This is based on the file srt0.s provided with the binary |
|---|
| 3 | * distribution of the SPARC Instruction Simulator (SIS) found |
|---|
| 4 | * at ftp://ftp.estec.esa.nl/pub/ws/wsd/erc32. |
|---|
| 5 | */ |
|---|
| 6 | |
|---|
| 7 | #include "asm.h" |
|---|
| 8 | |
|---|
| 9 | .register %g2, #scratch |
|---|
| 10 | .register %g3, #scratch |
|---|
| 11 | |
|---|
| 12 | .data |
|---|
| 13 | .align 8 |
|---|
| 14 | SYM(environ): |
|---|
| 15 | .long 0 |
|---|
| 16 | |
|---|
| 17 | .text |
|---|
| 18 | |
|---|
| 19 | .globl SYM(start) |
|---|
| 20 | SYM(start): |
|---|
| 21 | sethi %hi(__stack), %g1 |
|---|
| 22 | or %g1,%lo(__stack),%g1 |
|---|
| 23 | mov %g1, %sp ! set the stack pointer |
|---|
| 24 | mov %sp, %fp |
|---|
| 25 | |
|---|
| 26 | /* clear the bss */ |
|---|
| 27 | sethi %hi(__bss_start),%g2 |
|---|
| 28 | or %g2,%lo(__bss_start),%g2 ! start of bss |
|---|
| 29 | sethi %hi(_end),%g3 |
|---|
| 30 | or %g3,%lo(_end),%g3 ! end of bss |
|---|
| 31 | mov %g0,%g1 ! so std has two zeros |
|---|
| 32 | zerobss: |
|---|
| 33 | std %g0,[%g2] |
|---|
| 34 | add %g2,8,%g2 |
|---|
| 35 | cmp %g2,%g3 |
|---|
| 36 | bleu,a zerobss |
|---|
| 37 | nop |
|---|
| 38 | |
|---|
| 39 | /* move data segment to proper location */ |
|---|
| 40 | |
|---|
| 41 | #if 0 |
|---|
| 42 | relocd: |
|---|
| 43 | set (_endtext),%g2 ! g2 = start of data in aout file |
|---|
| 44 | set (_environ),%g4 ! g4 = start of where data should go |
|---|
| 45 | set (_edata),%g3 ! g3 = end of where data should go |
|---|
| 46 | subcc %g3, %g4, %g5 ! g5 = length of data |
|---|
| 47 | |
|---|
| 48 | subcc %g4, %g2, %g0 ! need to relocate data ? |
|---|
| 49 | ble initok |
|---|
| 50 | ld [%g4], %g6 |
|---|
| 51 | subcc %g6, 1, %g0 |
|---|
| 52 | be initok |
|---|
| 53 | mvdata: |
|---|
| 54 | subcc %g5, 8, %g5 |
|---|
| 55 | ldd [%g2 + %g5], %g6 |
|---|
| 56 | bg mvdata |
|---|
| 57 | std %g6, [%g4 + %g5] |
|---|
| 58 | |
|---|
| 59 | initok: |
|---|
| 60 | #endif |
|---|
| 61 | |
|---|
| 62 | call SYM(__fix_ctors) |
|---|
| 63 | nop |
|---|
| 64 | call SYM(main) |
|---|
| 65 | nop |
|---|
| 66 | |
|---|
| 67 | /* call exit from the C library so atexit gets called, and the |
|---|
| 68 | * C++ destructors get run. This calls our exit routine below * when it's done. |
|---|
| 69 | */ |
|---|
| 70 | call SYM(exit) |
|---|
| 71 | nop |
|---|
| 72 | |
|---|
| 73 | .globl SYM(_exit) |
|---|
| 74 | SYM(_exit): |
|---|
| 75 | set 0xdeadd00d, %o1 ! Magic number for simulator. |
|---|
| 76 | ta 0 ! Halt if _main returns ... |
|---|
| 77 | nop |
|---|
| 78 | |
|---|
