| 1 | /* |
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| 2 | * C startup code for the Fujitsu SPARClite demo board |
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| 3 | * |
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| 4 | * Copyright (c) 1995, 1996 Cygnus Support |
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| 5 | * |
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| 6 | * The authors hereby grant permission to use, copy, modify, distribute, |
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| 7 | * and license this software and its documentation for any purpose, provided |
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| 8 | * that existing copyright notices are retained in all copies and that this |
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| 9 | * notice is included verbatim in any distributions. No written agreement, |
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| 10 | * license, or royalty fee is required for any of the authorized uses. |
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| 11 | * Modifications to this software may be copyrighted by their authors |
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| 12 | * and need not follow the licensing terms described here, provided that |
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| 13 | * the new terms are clearly indicated on the first page of each file where |
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| 14 | * they apply. |
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| 15 | */ |
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| 16 | #include "asm.h" |
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| 17 | |
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| 18 | #ifdef TARGET_CPU_SPARC64 |
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| 19 | #define STACK_BIAS 2047 |
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| 20 | #define SAVE_SIZE -128 |
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| 21 | #else |
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| 22 | #define SAVE_SIZE -64 |
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| 23 | #endif |
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| 24 | |
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| 25 | .register %g2, #scratch |
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| 26 | .register %g3, #scratch |
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| 27 | |
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| 28 | .data |
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| 29 | .align 8 |
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| 30 | SYM(environ): ! this is the first address in the data section |
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| 31 | .long 0 |
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| 32 | |
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| 33 | SYM(argc): |
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| 34 | .long 0 |
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| 35 | |
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| 36 | .text |
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| 37 | .align 8 |
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| 38 | |
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| 39 | .globl SYM(start) |
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| 40 | .globl start |
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| 41 | SYM(start): |
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| 42 | start: |
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| 43 | /* see if the stack is already setup. if not, then default |
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| 44 | * to using the value of %sp as set by the ROM monitor |
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| 45 | */ |
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| 46 | sethi %hi(__stack), %g1 |
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| 47 | or %g1,%lo(__stack),%g1 |
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| 48 | cmp %g0,%g1 |
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| 49 | be 1f |
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| 50 | nop |
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| 51 | #ifdef STACK_BIAS |
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| 52 | sub %g1, STACK_BIAS, %g1 |
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| 53 | #endif |
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| 54 | mov %g1, %sp ! set the stack pointer |
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| 55 | mov 0, %fp |
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| 56 | 1: |
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| 57 | |
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| 58 | /* zero the bss section */ |
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| 59 | sethi %hi(__bss_start),%g2 |
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| 60 | or %g2,%lo(__bss_start),%g2 ! start of bss |
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| 61 | sethi %hi(_end),%g3 |
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| 62 | or %g3,%lo(_end),%g3 ! end of bss |
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| 63 | mov %g0,%g1 ! so std has two zeros |
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| 64 | zerobss: |
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| 65 | std %g0,[%g2] |
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| 66 | add %g2,8,%g2 |
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| 67 | cmp %g2,%g3 |
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| 68 | bleu,a zerobss |
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| 69 | nop |
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| 70 | |
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| 71 | /* |
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| 72 | * initialize target specific stuff. Only execute these |
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| 73 | * functions it they exist. |
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| 74 | */ |
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| 75 | init: |
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| 76 | sethi %hi(SYM(hardware_init_hook)), %g1 |
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| 77 | or %g1,%lo(SYM(hardware_init_hook)),%g1 |
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| 78 | cmp %g0,%g1 |
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| 79 | be 1f |
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| 80 | nop |
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| 81 | call SYM(hardware_init_hook) |
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| 82 | nop |
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| 83 | |
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| 84 | 1: |
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| 85 | sethi %hi(SYM(software_init_hook)), %g1 |
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| 86 | or %g1,%lo(SYM(software_init_hook)),%g1 |
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| 87 | cmp %g0,%g1 |
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| 88 | be 2f |
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| 89 | nop |
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| 90 | call SYM(software_init_hook) |
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| 91 | nop |
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| 92 | 2: |
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| 93 | set SYM(__sigtramp), %o0 |
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| 94 | call SYM(__install_signal_handler) |
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| 95 | nop |
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| 96 | |
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| 97 | set do_dtors,%o0 |
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| 98 | call SYM(atexit) |
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| 99 | nop |
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| 100 | |
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| 101 | call do_ctors |
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| 102 | nop |
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| 103 | |
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| 104 | set SYM(argc), %o0 |
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| 105 | call SYM(__getProgramArgs) |
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| 106 | nop |
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| 107 | |
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| 108 | mov %o0, %o1 |
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| 109 | set SYM(argc), %o0 |
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| 110 | ld [%o0], %o0 |
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| 111 | call SYM(main) |
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| 112 | nop |
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| 113 | |
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| 114 | /* call exit from the C library so atexit gets called, and the |
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| 115 | * C++ destructors get run. This calls our exit routine below |
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| 116 | * when it's done. |
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| 117 | */ |
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| 118 | call SYM(exit) |
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| 119 | nop |
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| 120 | |
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| 121 | do_ctors: |
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| 122 | save %sp,SAVE_SIZE,%sp |
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| 123 | set __CTOR_LIST__,%l0 |
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| 124 | our_entry: |
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| 125 | ld [%l0],%l1 |
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| 126 | add %l0,4,%l0 |
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| 127 | tst %l1 |
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| 128 | 1: |
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| 129 | beq 2f |
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| 130 | nop |
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| 131 | ld [%l0],%l2 |
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| 132 | add %l0,4,%l0 |
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| 133 | |
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| 134 | call %l2 |
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| 135 | nop |
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| 136 | deccc %l1 |
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| 137 | b 1b |
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| 138 | nop |
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| 139 | 2: |
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| 140 | ret |
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| 141 | restore |
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| 142 | |
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| 143 | do_dtors: |
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| 144 | save %sp,SAVE_SIZE,%sp |
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| 145 | set __DTOR_LIST__,%l0 |
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| 146 | b our_entry |
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| 147 | nop |
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