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- /* Startup code compliant to the ELF RISC-V ABI.
- Copyright (C) 1995-2018 Free Software Foundation, Inc.
- 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 <sysdep.h>
- #include <sys/asm.h>
- /* The entry point's job is to call __uClibc_main. Per the ABI,
- a0 contains the address of a function to be passed to atexit.
- __uClibc_main wants this in a5. */
- .text
- .globl _start
- .type _start,%function
- _start:
- 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. */
- mv a6, sp /* stack_end. */
- tail __uClibc_main@plt
- .size _start,.-_start
- /* 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
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