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96 lines
3.2 KiB
ArmAsm
96 lines
3.2 KiB
ArmAsm
/* Startup code for programs linked with GNU libc.
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Copyright (C) 1998-2023 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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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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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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/* We do not want .eh_frame info for crt1.o since crt1.o is linked
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before crtbegin.o, the file defining __EH_FRAME_BEGIN__. */
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#undef cfi_startproc
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#define cfi_startproc
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#undef cfi_endproc
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#define cfi_endproc
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/* These are the various addresses we require. */
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#ifdef PIC
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.section ".data"
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#else
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.section ".rodata"
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#endif
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.align 2
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L(start_addresses):
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.long _SDA_BASE_
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.long main
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.long 0 /* Used to be init. */
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.long 0 /* Used to be fini. */
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ASM_SIZE_DIRECTIVE(L(start_addresses))
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.section ".text"
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ENTRY(_start)
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/* Save the stack pointer, in case we're statically linked under Linux. */
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mr r9,r1
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/* Set up an initial stack frame, and clear the LR. */
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clrrwi r1,r1,4
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#ifdef PIC
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SETUP_GOT_ACCESS(r13,got_label)
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li r0,0
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#else
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li r0,0
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#endif
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stwu r1,-16(r1)
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mtlr r0
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stw r0,0(r1)
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/* Set r13 to point at the 'small data area', and put the address of
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start_addresses in r8. Also load the GOT pointer so that new PLT
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calls work, like the one to __libc_start_main. */
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#ifdef PIC
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addis r30,r13,_GLOBAL_OFFSET_TABLE_-got_label@ha
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addis r8,r13,L(start_addresses)-got_label@ha
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addi r30,r30,_GLOBAL_OFFSET_TABLE_-got_label@l
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lwzu r13, L(start_addresses)-got_label@l(r8)
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#else
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lis r8,L(start_addresses)@ha
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lwzu r13,L(start_addresses)@l(r8)
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#endif
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/* and continue in libc-start, in glibc. */
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b JUMPTARGET(__libc_start_main)
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END(_start)
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/* Define a symbol for the first piece of initialized data. */
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.section ".data"
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.globl __data_start
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__data_start:
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.long 0
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weak_alias (__data_start, data_start)
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