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Last change
on this file since 467 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:
1.5 KB
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| [444] | 1 | /* linux-crt0 -- Startup routines for the Linux BSP. |
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| 2 | * |
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| 3 | * Copyright (c) 2011 Edgar E. Iglesias |
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| 4 | * |
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| 5 | * The authors hereby grant permission to use, copy, modify, distribute, |
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| 6 | * and license this software and its documentation for any purpose, provided |
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| 7 | * that existing copyright notices are retained in all copies and that this |
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| 8 | * notice is included verbatim in any distributions. No written agreement, |
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| 9 | * license, or royalty fee is required for any of the authorized uses. |
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| 10 | * Modifications to this software may be copyrighted by their authors |
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| 11 | * and need not follow the licensing terms described here, provided that |
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| 12 | * the new terms are clearly indicated on the first page of each file where |
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| 13 | * they apply. |
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| 14 | */ |
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| 15 | |
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| 16 | .section .text |
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| 17 | .globl _start |
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| 18 | .ent _start |
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| 19 | .type _start, @function |
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| 20 | _start: |
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| 21 | la r13, r0, _SDA_BASE_ |
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| 22 | la r2, r0, _SDA2_BASE_ |
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| 23 | |
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| 24 | brlid r15, __init |
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| 25 | nop |
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| 26 | |
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| 27 | lwi r5, r1, 0 |
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| 28 | addik r6, r1, 4 |
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| 29 | |
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| 30 | # Add argc * 4. |
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| 31 | addk r7, r5, r5 |
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| 32 | addk r7, r7, r7 |
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| 33 | |
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| 34 | brlid r15, main |
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| 35 | # Now add 4 + r1 (i.e r6) in the delayslot. |
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| 36 | addk r7, r7, r6 |
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| 37 | |
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| 38 | brlid r15, exit |
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| 39 | addik r5, r3, 0 |
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| 40 | .size _start, . - _start |
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| 41 | .end _start |
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| 42 | |
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| 43 | /* Replacement for the GCC provided crti.S. This one avoids the |
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| 44 | setup of stack protection regs (which result in privilieged |
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| 45 | insn exceptions when running in user-space). */ |
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| 46 | .section .init, "ax" |
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| 47 | .global __init |
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| 48 | .align 2 |
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| 49 | __init: |
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| 50 | addik r1, r1, -8 |
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| 51 | sw r15, r0, r1 |
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| 52 | |
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| 53 | .section .fini, "ax" |
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| 54 | .global __fini |
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| 55 | .align 2 |
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| 56 | __fini: |
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| 57 | addik r1, r1, -8 |
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| 58 | sw r15, r0, r1 |
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