|
Last change
on this file since 668 was
444,
checked in by satin@…, 6 years ago
|
|
add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
|
File size:
1.3 KB
|
| Rev | Line | |
|---|
| [444] | 1 | /* crt0.S for the sparclet 701. |
|---|
| 2 | |
|---|
| 3 | At the moment, all the necessary syscalls are here. |
|---|
| 4 | Convention has them in a separate file but libgloss is still in |
|---|
| 5 | too much flux. */ |
|---|
| 6 | |
|---|
| 7 | .text |
|---|
| 8 | |
|---|
| 9 | .global start |
|---|
| 10 | start: |
|---|
| 11 | |
|---|
| 12 | ! zero bss |
|---|
| 13 | |
|---|
| 14 | sethi %hi(_end), %o1 |
|---|
| 15 | or %o1, %lo(_end), %o1 |
|---|
| 16 | sethi %hi(_edata), %o0 |
|---|
| 17 | or %o0, %lo (_edata), %o0 |
|---|
| 18 | sub %o1, %o0, %o1 |
|---|
| 19 | Lzero_bss: |
|---|
| 20 | subcc %o1, 4, %o1 |
|---|
| 21 | clr [%o0] |
|---|
| 22 | bne Lzero_bss |
|---|
| 23 | add %o0, 4, %o0 |
|---|
| 24 | |
|---|
| 25 | ! set up argc, argv, envp (?) |
|---|
| 26 | |
|---|
| 27 | ld [%sp+64], %o0 |
|---|
| 28 | sll %o0, 2, %o2 |
|---|
| 29 | add %o2, 4, %o2 |
|---|
| 30 | add %sp, 68, %o1 |
|---|
| 31 | add %o1, %o2, %o2 |
|---|
| 32 | sethi %hi(_environ), %o3 |
|---|
| 33 | st %o2, [%o3+%lo(_environ)] |
|---|
| 34 | |
|---|
| 35 | ! call main, exit |
|---|
| 36 | |
|---|
| 37 | call _main |
|---|
| 38 | sub %sp, 32, %sp |
|---|
| 39 | call _exit |
|---|
| 40 | nop |
|---|
| 41 | |
|---|
| 42 | ! void _exit (int rc) |
|---|
| 43 | |
|---|
| 44 | .global __exit |
|---|
| 45 | __exit: |
|---|
| 46 | mov 1, %g1 |
|---|
| 47 | ta 0 |
|---|
| 48 | ! If that does not work, just loop forever. |
|---|
| 49 | Lloop_forever: |
|---|
| 50 | b Lloop_forever |
|---|
| 51 | nop |
|---|
| 52 | |
|---|
| 53 | ! int _open (char *, int) |
|---|
| 54 | |
|---|
| 55 | .global _open |
|---|
| 56 | _open: |
|---|
| 57 | mov 5, %g1 |
|---|
| 58 | ta 0 |
|---|
| 59 | bcc Lnoerr |
|---|
| 60 | nop |
|---|
| 61 | b Lcerror |
|---|
| 62 | nop |
|---|
| 63 | |
|---|
| 64 | ! int _close (int) |
|---|
| 65 | |
|---|
| 66 | .global _close |
|---|
| 67 | _close: |
|---|
| 68 | mov 6, %g1 |
|---|
| 69 | ta 0 |
|---|
| 70 | bcc Lnoerr |
|---|
| 71 | nop |
|---|
| 72 | b Lcerror |
|---|
| 73 | nop |
|---|
| 74 | |
|---|
| 75 | ! int read (int, char *, int) |
|---|
| 76 | |
|---|
| 77 | .global _read |
|---|
| 78 | _read: |
|---|
| 79 | mov 3, %g1 |
|---|
| 80 | ta 0 |
|---|
| 81 | bcc Lnoerr |
|---|
| 82 | nop |
|---|
| 83 | b Lcerror |
|---|
| 84 | nop |
|---|
| 85 | |
|---|
| 86 | ! int write (int, char *, int) |
|---|
| 87 | |
|---|
| 88 | .global _write |
|---|
| 89 | _write: |
|---|
| 90 | mov 4, %g1 |
|---|
| 91 | ta 0 |
|---|
| 92 | bcc Lnoerr |
|---|
| 93 | nop |
|---|
| 94 | b Lcerror |
|---|
| 95 | nop |
|---|
| 96 | |
|---|
| 97 | Lnoerr: |
|---|
| 98 | retl |
|---|
| 99 | nop |
|---|
| 100 | |
|---|
| 101 | Lcerror: |
|---|
| 102 | sethi %hi(__impure_ptr), %g1 |
|---|
| 103 | st %o0, [%g1+%lo(__impure_ptr)] |
|---|
| 104 | retl |
|---|
| 105 | mov -1, %o0 |
|---|
Note: See
TracBrowser
for help on using the repository browser.
