2022-07-19 01:20:46 +00:00
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/* Startup code compliant to the ELF LoongArch ABI.
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Copyright (C) 2022 Free Software Foundation, Inc.
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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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2022-08-22 13:21:53 +00:00
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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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2022-07-19 01:20:46 +00:00
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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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2022-08-22 13:21:53 +00:00
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License along with the GNU C Library; if not, see
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2022-07-19 01:20:46 +00:00
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<https://www.gnu.org/licenses/>. */
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#define __ASSEMBLY__ 1
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#include <entry.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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/*
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int
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__libc_start_main (int (*main) (int, char **, char **),
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int argc,
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char **argv,
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__typeof (main) init,
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void (*fini) (void),
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void (*rtld_fini) (void),
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void *stack_end);
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*/
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ENTRY (ENTRY_POINT)
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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 (1)
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or a5, a0, zero /* rtld_fini */
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/* We must get symbol main through GOT table, since main may not be local.
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For instance: googletest defines main in dynamic library. */
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la.got a0, t0, main
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REG_L a1, sp, 0
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ADDI a2, sp, SZREG
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/* Adjust $sp for 16-aligned */
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BSTRINS sp, zero, 3, 0
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move a3, zero /* used to be init */
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move a4, zero /* used to be fini */
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or a6, sp, zero /* stack_end */
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la.got ra, t0, __libc_start_main
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jirl ra, ra, 0
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la.got ra, t0, abort
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jirl ra, ra, 0
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END (ENTRY_POINT)
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