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Last change
on this file since 672 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.3 KB
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| 1 | /* crt0.S for the sparclet 701. |
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| 2 | |
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| 3 | At the moment, all the necessary syscalls are here. |
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| 4 | Convention has them in a separate file but libgloss is still in |
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| 5 | too much flux. */ |
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| 6 | |
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| 7 | .text |
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| 8 | |
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| 9 | .global start |
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| 10 | start: |
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| 11 | |
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| 12 | ! zero bss |
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| 13 | |
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| 14 | sethi %hi(_end), %o1 |
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| 15 | or %o1, %lo(_end), %o1 |
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| 16 | sethi %hi(_edata), %o0 |
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| 17 | or %o0, %lo (_edata), %o0 |
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| 18 | sub %o1, %o0, %o1 |
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| 19 | Lzero_bss: |
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| 20 | subcc %o1, 4, %o1 |
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| 21 | clr [%o0] |
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| 22 | bne Lzero_bss |
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| 23 | add %o0, 4, %o0 |
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| 24 | |
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| 25 | ! set up argc, argv, envp (?) |
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| 26 | |
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| 27 | ld [%sp+64], %o0 |
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| 28 | sll %o0, 2, %o2 |
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| 29 | add %o2, 4, %o2 |
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| 30 | add %sp, 68, %o1 |
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| 31 | add %o1, %o2, %o2 |
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| 32 | sethi %hi(_environ), %o3 |
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| 33 | st %o2, [%o3+%lo(_environ)] |
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| 34 | |
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| 35 | ! call main, exit |
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| 36 | |
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| 37 | call _main |
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| 38 | sub %sp, 32, %sp |
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| 39 | call _exit |
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| 40 | nop |
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| 41 | |
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| 42 | ! void _exit (int rc) |
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| 43 | |
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| 44 | .global __exit |
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| 45 | __exit: |
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| 46 | mov 1, %g1 |
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| 47 | ta 0 |
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| 48 | ! If that does not work, just loop forever. |
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| 49 | Lloop_forever: |
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| 50 | b Lloop_forever |
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| 51 | nop |
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| 52 | |
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| 53 | ! int _open (char *, int) |
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| 54 | |
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| 55 | .global _open |
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| 56 | _open: |
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| 57 | mov 5, %g1 |
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| 58 | ta 0 |
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| 59 | bcc Lnoerr |
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| 60 | nop |
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| 61 | b Lcerror |
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| 62 | nop |
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| 63 | |
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| 64 | ! int _close (int) |
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| 65 | |
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| 66 | .global _close |
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| 67 | _close: |
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| 68 | mov 6, %g1 |
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| 69 | ta 0 |
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| 70 | bcc Lnoerr |
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| 71 | nop |
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| 72 | b Lcerror |
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| 73 | nop |
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| 74 | |
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| 75 | ! int read (int, char *, int) |
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| 76 | |
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| 77 | .global _read |
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| 78 | _read: |
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| 79 | mov 3, %g1 |
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| 80 | ta 0 |
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| 81 | bcc Lnoerr |
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| 82 | nop |
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| 83 | b Lcerror |
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| 84 | nop |
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| 85 | |
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| 86 | ! int write (int, char *, int) |
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| 87 | |
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| 88 | .global _write |
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| 89 | _write: |
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| 90 | mov 4, %g1 |
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| 91 | ta 0 |
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| 92 | bcc Lnoerr |
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| 93 | nop |
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| 94 | b Lcerror |
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| 95 | nop |
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| 96 | |
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| 97 | Lnoerr: |
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| 98 | retl |
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| 99 | nop |
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| 100 | |
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| 101 | Lcerror: |
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| 102 | sethi %hi(__impure_ptr), %g1 |
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| 103 | st %o0, [%g1+%lo(__impure_ptr)] |
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| 104 | retl |
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| 105 | mov -1, %o0 |
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