| /* Startup code compliant to the ELF RISC-V ABI. |
| Copyright (C) 1995-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| In addition to the permissions in the GNU Lesser General Public |
| License, the Free Software Foundation gives you unlimited |
| permission to link the compiled version of this file with other |
| programs, and to distribute those programs without any restriction |
| coming from the use of this file. (The GNU Lesser General Public |
| License restrictions do apply in other respects; for example, they |
| cover modification of the file, and distribution when not linked |
| into another program.) |
| |
| Note that people who make modified versions of this file are not |
| obligated to grant this special exception for their modified |
| versions; it is their choice whether to do so. The GNU Lesser |
| General Public License gives permission to release a modified |
| version without this exception; this exception also makes it |
| possible to release a modified version which carries forward this |
| exception. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #define __ASSEMBLY__ 1 |
| #include <entry.h> |
| #include <sysdep.h> |
| #include <sys/asm.h> |
| |
| /* The entry point's job is to call __libc_start_main. Per the ABI, |
| a0 contains the address of a function to be passed to atexit. |
| __libc_start_main wants this in a5. */ |
| |
| ENTRY (ENTRY_POINT) |
| call .Lload_gp |
| mv a5, a0 /* rtld_fini. */ |
| /* main may be in a shared library. */ |
| la a0, main |
| REG_L a1, 0(sp) /* argc. */ |
| addi a2, sp, SZREG /* argv. */ |
| andi sp, sp, ALMASK /* Align stack. */ |
| lla a3, __libc_csu_init |
| lla a4, __libc_csu_fini |
| mv a6, sp /* stack_end. */ |
| |
| tail __libc_start_main@plt |
| END (ENTRY_POINT) |
| |
| /* Dynamic links need the global pointer to be initialized prior to calling |
| any shared library's initializers, so we use preinit_array to load it. |
| This doesn't cut it for static links, though, since the global pointer |
| needs to be initialized before calling __libc_start_main in that case. |
| So we redundantly initialize it at the beginning of _start. */ |
| |
| .Lload_gp: |
| .option push |
| .option norelax |
| lla gp, __global_pointer$ |
| .option pop |
| ret |
| |
| .section .preinit_array,"aw" |
| .dc.a .Lload_gp |
| |
| /* Define a symbol for the first piece of initialized data. */ |
| .data |
| .globl __data_start |
| __data_start: |
| .weak data_start |
| data_start = __data_start |
