| 1 | /* Startup code for ARC. |
| 2 | Copyright (C) 2020-2021 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library. If not, see |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #define __ASSEMBLY__ 1 |
| 20 | #include <entry.h> |
| 21 | #include <sysdep.h> |
| 22 | |
| 23 | #ifndef ENTRY_POINT |
| 24 | # error ENTRY_POINT needs to be defined for ARC |
| 25 | #endif |
| 26 | |
| 27 | /* When we enter this piece of code, the program stack looks like this: |
| 28 | argc argument counter (integer) |
| 29 | argv[0] program name (pointer) |
| 30 | argv[1...N] program args (pointers) |
| 31 | argv[argc-1] end of args (integer) |
| 32 | NULL |
| 33 | env[0...N] environment variables (pointers) |
| 34 | NULL. */ |
| 35 | |
| 36 | ENTRY (ENTRY_POINT) |
| 37 | |
| 38 | /* Needed to make gdb backtraces stop here. */ |
| 39 | .cfi_label .Ldummy |
| 40 | cfi_undefined (blink) |
| 41 | |
| 42 | mov fp, 0 |
| 43 | ld_s r1, [sp] /* argc. */ |
| 44 | |
| 45 | mov_s r5, r0 /* rltd_fini. */ |
| 46 | add_s r2, sp, 4 /* argv. */ |
| 47 | and sp, sp, -8 |
| 48 | mov r6, sp |
| 49 | |
| 50 | /* __libc_start_main (main, argc, argv, init, fini, rtld_fini, stack_end). */ |
| 51 | |
| 52 | #ifdef SHARED |
| 53 | ld r0, [pcl, @main@gotpc] |
| 54 | ld r3, [pcl, @__libc_csu_init@gotpc] |
| 55 | ld r4, [pcl, @__libc_csu_fini@gotpc] |
| 56 | bl __libc_start_main@plt |
| 57 | #else |
| 58 | mov_s r0, main |
| 59 | mov_s r3, __libc_csu_init |
| 60 | mov r4, __libc_csu_fini |
| 61 | bl __libc_start_main |
| 62 | #endif |
| 63 | |
| 64 | /* Should never get here. */ |
| 65 | flag 1 |
| 66 | END (ENTRY_POINT) |
| 67 | |
| 68 | /* Define a symbol for the first piece of initialized data. */ |
| 69 | .data |
| 70 | .globl __data_start |
| 71 | __data_start: |
| 72 | .long 0 |
| 73 | .weak data_start |
| 74 | data_start = __data_start |