| 1 | /* Startup code compliant to the ELF C-SKY ABIV2. |
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| 2 | Copyright (C) 2018-2024 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 | /* We need to call: |
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| 37 | __libc_start_main (int (*main) (int, char **, char **), int argc, |
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| 38 | char **argv, void (*init) (void), void (*fini) (void), |
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| 39 | void (*rtld_fini) (void), void *stack_end) |
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| 40 | */ |
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| 41 | |
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| 42 | #include <sysdep.h> |
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| 43 | |
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| 44 | .text |
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| 45 | .globl _start; |
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| 46 | .type _start,@function; |
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| 47 | .align 4; |
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| 48 | _start: |
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| 49 | cfi_startproc |
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| 50 | .cfi_label .Ldummy |
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| 51 | cfi_undefined (lr) |
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| 52 | subi sp, 8 |
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| 53 | /* Clear the link register since this is the outermost frame. */ |
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| 54 | movi lr, 0 |
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| 55 | /* Pop argc off the stack and save a pointer to argv. */ |
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| 56 | ldw a1, (sp, 8) /* Init argc for __libc_start_main. */ |
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| 57 | addi a2, sp, 12 /* Init argv for __libc_start_main. */ |
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| 58 | |
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| 59 | /* Push stack limit. */ |
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| 60 | stw a2, (sp, 8) |
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| 61 | /* Push rtld_fini. */ |
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| 62 | stw a0, (sp, 4) |
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| 63 | |
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| 64 | #ifdef SHARED |
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| 65 | grs t0, .Lgetpc |
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| 66 | .Lgetpc: |
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| 67 | lrw gb, .Lgetpc@GOTPC |
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| 68 | addu gb, t0 |
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| 69 | |
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| 70 | movi a3, 0 /* Used to be init. */ |
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| 71 | stw a3, (sp, 0) /* Used to be fini. */ |
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| 72 | |
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| 73 | lrw t0, main@GOT |
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| 74 | addu t0, gb |
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| 75 | ldw a0, (t0, 0) |
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| 76 | lrw t1, __libc_start_main@PLT |
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| 77 | ldr.w t1, (gb, t1 << 0) |
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| 78 | jsr t1 |
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| 79 | |
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| 80 | lrw t1, abort@PLT |
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| 81 | ldr.w t1, (gb, t1 << 0) |
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| 82 | jsr t1 |
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| 83 | #else |
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| 84 | movi a3, 0 /* Used to be init. */ |
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| 85 | stw a3, (sp, 0) /* Used to be fini. */ |
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| 86 | lrw a0, main |
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| 87 | /* Let the libc call main and exit with its return code. */ |
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| 88 | jsri __libc_start_main |
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| 89 | |
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| 90 | /* Should never get here. */ |
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| 91 | jsri abort |
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| 92 | #endif /* !SHARED */ |
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| 93 | cfi_endproc |
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| 94 | .size _start,.-_start |
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| 95 | |
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| 96 | |
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| 97 | /* Define a symbol for the first piece of initialized data. */ |
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| 98 | .data |
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| 99 | .globl __data_start |
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| 100 | __data_start: |
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| 101 | .long 0 |
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| 102 | .weak data_start |
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| 103 | data_start = __data_start |
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| 104 | |
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