2017-12-27 04:51:24 +00:00
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/* Startup code compliant to the ELF RISC-V ABI.
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2020-01-01 00:14:33 +00:00
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Copyright (C) 1995-2020 Free Software Foundation, Inc.
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2017-12-27 04:51:24 +00:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU Lesser General Public
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License, the Free Software Foundation gives you unlimited
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permission to link the compiled version of this file with other
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programs, and to distribute those programs without any restriction
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coming from the use of this file. (The GNU Lesser General Public
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License restrictions do apply in other respects; for example, they
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cover modification of the file, and distribution when not linked
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into another program.)
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Note that people who make modified versions of this file are not
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obligated to grant this special exception for their modified
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versions; it is their choice whether to do so. The GNU Lesser
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General Public License gives permission to release a modified
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version without this exception; this exception also makes it
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possible to release a modified version which carries forward this
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exception.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
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<https://www.gnu.org/licenses/>. */
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2017-12-27 04:51:24 +00:00
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#define __ASSEMBLY__ 1
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#include <entry.h>
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#include <sysdep.h>
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#include <sys/asm.h>
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/* The entry point's job is to call __libc_start_main. Per the ABI,
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a0 contains the address of a function to be passed to atexit.
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__libc_start_main wants this in a5. */
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ENTRY (ENTRY_POINT)
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2018-09-25 09:11:27 +00:00
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/* Terminate call stack by noting ra is undefined. Use a dummy
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.cfi_label to force starting the FDE. */
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.cfi_label .Ldummy
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cfi_undefined (ra)
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2019-08-12 09:29:29 +00:00
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call load_gp
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2017-12-27 04:51:24 +00:00
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mv a5, a0 /* rtld_fini. */
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/* main may be in a shared library. */
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la a0, main
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REG_L a1, 0(sp) /* argc. */
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addi a2, sp, SZREG /* argv. */
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andi sp, sp, ALMASK /* Align stack. */
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lla a3, __libc_csu_init
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lla a4, __libc_csu_fini
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mv a6, sp /* stack_end. */
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2018-09-25 09:11:27 +00:00
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call __libc_start_main@plt
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ebreak
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2017-12-27 04:51:24 +00:00
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END (ENTRY_POINT)
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/* Dynamic links need the global pointer to be initialized prior to calling
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any shared library's initializers, so we use preinit_array to load it.
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This doesn't cut it for static links, though, since the global pointer
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needs to be initialized before calling __libc_start_main in that case.
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So we redundantly initialize it at the beginning of _start. */
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2019-08-12 09:29:29 +00:00
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load_gp:
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2017-12-27 04:51:24 +00:00
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.option push
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.option norelax
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lla gp, __global_pointer$
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.option pop
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ret
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.section .preinit_array,"aw"
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2019-08-12 09:29:29 +00:00
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.dc.a load_gp
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2017-12-27 04:51:24 +00:00
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/* Define a symbol for the first piece of initialized data. */
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.data
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.globl __data_start
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__data_start:
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.weak data_start
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data_start = __data_start
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