| 1 | /* ELF startup code for HPPA. |
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| 2 | Copyright (C) 2002-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | In addition to the permissions in the GNU Lesser General Public |
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| 11 | License, the Free Software Foundation gives you unlimited |
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| 12 | permission to link the compiled version of this file with other |
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| 13 | programs, and to distribute those programs without any restriction |
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| 14 | coming from the use of this file. (The GNU Lesser General Public |
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| 15 | License restrictions do apply in other respects; for example, they |
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| 16 | cover modification of the file, and distribution when not linked |
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| 17 | into another program.) |
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| 18 | |
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| 19 | Note that people who make modified versions of this file are not |
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| 20 | obligated to grant this special exception for their modified |
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| 21 | versions; it is their choice whether to do so. The GNU Lesser |
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| 22 | General Public License gives permission to release a modified |
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| 23 | version without this exception; this exception also makes it |
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| 24 | possible to release a modified version which carries forward this |
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| 25 | exception. |
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| 26 | |
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| 27 | The GNU C Library is distributed in the hope that it will be useful, |
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| 28 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 29 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 30 | Lesser General Public License for more details. |
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| 31 | |
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| 32 | You should have received a copy of the GNU Lesser General Public |
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| 33 | License along with the GNU C Library. If not, see |
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| 34 | <https://www.gnu.org/licenses/>. */ |
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| 35 | |
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| 36 | .import main, code |
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| 37 | .import $global$, data |
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| 38 | .import __libc_start_main, code |
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| 39 | |
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| 40 | /* Have the linker create plabel words so we get PLABEL32 |
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| 41 | relocs and not 21/14. The use of 21/14 relocs is only |
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| 42 | supported in the latest dynamic linker. */ |
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| 43 | #ifdef PIC |
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| 44 | .section .data.rel.ro,"aw" ,@progbits |
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| 45 | #else |
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| 46 | .section .rodata,"a" ,@progbits |
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| 47 | #endif |
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| 48 | .align 4 |
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| 49 | .Lpmain: |
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| 50 | .word P%main |
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| 51 | .Lp__libc_start_main: |
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| 52 | .word P%__libc_start_main |
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| 53 | |
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| 54 | .text |
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| 55 | .align 4 |
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| 56 | .globl _start |
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| 57 | .export _start, ENTRY |
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| 58 | .type _start,@function |
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| 59 | _start: |
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| 60 | /* At entry to the function we have: |
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| 61 | |
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| 62 | r26 - Unused |
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| 63 | r25 - argc |
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| 64 | r24 - argv |
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| 65 | r23 - False _dl_fini plabel address |
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| 66 | |
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| 67 | This function is called from the lower half of RTLD_START. |
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| 68 | |
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| 69 | The call to __libc_start_main expects: |
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| 70 | |
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| 71 | 1. r26 - Application main |
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| 72 | 2. r25 - argc |
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| 73 | 3. r24 - argv |
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| 74 | 4. r23 - init (unused) |
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| 75 | 5. sp-52 - fini (unused) |
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| 76 | 6. sp-56 - rtld_fini |
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| 77 | 7. sp-60 - stackend */ |
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| 78 | |
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| 79 | .proc |
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| 80 | .callinfo |
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| 81 | /* Clear previous-sp. */ |
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| 82 | stw %r0, -4(%sp) |
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| 83 | /* Setup the stack and frame. */ |
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| 84 | stw %rp, -20(%sp) |
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| 85 | ldo 64(%sp), %sp |
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| 86 | stw %sp, -4(%sp) |
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| 87 | stw %r19, -32(%sp) |
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| 88 | |
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| 89 | /* argc and argv should be in 25 and 24 (2nd and 3rd argument) */ |
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| 90 | /* void (*rtld_fini) (void) (6th argument) */ |
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| 91 | stw %r23, -56(%sp) |
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| 92 | |
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| 93 | /* Need to setup 1, 4, 5, and 7th arguments */ |
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| 94 | |
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| 95 | #ifdef PIC |
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| 96 | /* Load $global$ address into %dp */ |
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| 97 | bl .+8, %dp |
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| 98 | addil L'$global$-$PIC_pcrel$0+1, %dp |
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| 99 | ldo R'$global$-$PIC_pcrel$0+5(%r1), %dp |
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| 100 | |
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| 101 | /* load main (1st argument) */ |
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| 102 | addil LT'.Lpmain, %r19 |
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| 103 | ldw RT'.Lpmain(%r1), %r26 |
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| 104 | ldw 0(%r26),%r26 |
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| 105 | #else |
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| 106 | /* Load $global$ address into %dp */ |
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| 107 | ldil L%$global$, %dp |
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| 108 | ldo R%$global$(%dp), %dp |
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| 109 | |
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| 110 | /* load main (1st argument) */ |
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| 111 | ldil LR'.Lpmain, %r26 |
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| 112 | ldw RR'.Lpmain(%r26), %r26 |
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| 113 | #endif |
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| 114 | ldi 0,%r23 /* Used to be init. */ |
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| 115 | ldi 0,%r22 /* Used to be fini. */ |
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| 116 | /* Store 5th argument */ |
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| 117 | stw %r22, -52(%sp) |
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| 118 | /* void *stack_end (7th argument) */ |
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| 119 | stw %sp, -60(%sp) |
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| 120 | bl __libc_start_main,%r2 |
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| 121 | nop |
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| 122 | /* die horribly if it returned (it shouldn't) */ |
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| 123 | iitlbp %r0,(%sr0,%r0) |
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| 124 | nop |
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| 125 | |
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| 126 | .procend |
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| 127 | |
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| 128 | /* Define a symbol for the first piece of initialized data. */ |
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| 129 | .data |
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| 130 | .globl __data_start |
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| 131 | __data_start: |
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| 132 | .long 0 |
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| 133 | .weak data_start |
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| 134 | data_start = __data_start |
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| 135 | |
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