mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-13 23:00:22 +00:00
25f1e16ef0
CET is only support for x86_64, this patch reverts: -faaee1f07e
x86: Support shadow stack pointer in setjmp/longjmp. -be9ccd27c0
i386: Add _CET_ENDBR to indirect jump targets in add_n.S/sub_n.S -c02695d776
x86/CET: Update vfork to prevent child return -5d844e1b72
i386: Enable CET support in ucontext functions -124bcde683
x86: Add _CET_ENDBR to functions in crti.S -562837c002
x86: Add _CET_ENDBR to functions in dl-tlsdesc.S -f753fa7dea
x86: Support IBT and SHSTK in Intel CET [BZ #21598] -825b58f3fb
i386-mcount.S: Add _CET_ENDBR to _mcount and __fentry__ -7e119cd582
i386: Use _CET_NOTRACK in i686/memcmp.S -177824e232
i386: Use _CET_NOTRACK in memcmp-sse4.S -0a899af097
i386: Use _CET_NOTRACK in memcpy-ssse3-rep.S -7fb613361c
i386: Use _CET_NOTRACK in memcpy-ssse3.S -77a8ae0948
i386: Use _CET_NOTRACK in memset-sse2-rep.S -00e7b76a8f
i386: Use _CET_NOTRACK in memset-sse2.S -90d15dc577
i386: Use _CET_NOTRACK in strcat-sse2.S -f1574581c7
i386: Use _CET_NOTRACK in strcpy-sse2.S -4031d7484a
i386/sub_n.S: Add a missing _CET_ENDBR to indirect jump - target - Checked on i686-linux-gnu.
154 lines
4.9 KiB
ArmAsm
154 lines
4.9 KiB
ArmAsm
/* Startup code compliant to the ELF i386 ABI.
|
|
Copyright (C) 1995-2024 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
/* This is the canonical entry point, usually the first thing in the text
|
|
segment. The SVR4/i386 ABI (pages 3-31, 3-32) says that when the entry
|
|
point runs, most registers' values are unspecified, except for:
|
|
|
|
%edx Contains a function pointer to be registered with `atexit'.
|
|
This is how the dynamic linker arranges to have DT_FINI
|
|
functions called for shared libraries that have been loaded
|
|
before this code runs.
|
|
|
|
%esp The stack contains the arguments and environment:
|
|
0(%esp) argc
|
|
4(%esp) argv[0]
|
|
...
|
|
(4*argc)(%esp) NULL
|
|
(4*(argc+1))(%esp) envp[0]
|
|
...
|
|
NULL
|
|
*/
|
|
|
|
#include <sysdep.h>
|
|
|
|
ENTRY (_start)
|
|
/* Clearing frame pointer is insufficient, use CFI. */
|
|
cfi_undefined (eip)
|
|
/* Clear the frame pointer. The ABI suggests this be done, to mark
|
|
the outermost frame obviously. */
|
|
xorl %ebp, %ebp
|
|
|
|
/* Extract the arguments as encoded on the stack and set up
|
|
the arguments for `main': argc, argv. envp will be determined
|
|
later in __libc_start_main. */
|
|
popl %esi /* Pop the argument count. */
|
|
movl %esp, %ecx /* argv starts just at the current stack top.*/
|
|
|
|
/* Before pushing the arguments align the stack to a 16-byte
|
|
(SSE needs 16-byte alignment) boundary to avoid penalties from
|
|
misaligned accesses. Thanks to Edward Seidl <seidl@janed.com>
|
|
for pointing this out. */
|
|
andl $0xfffffff0, %esp
|
|
pushl %eax /* Push garbage because we allocate
|
|
28 more bytes. */
|
|
|
|
/* Provide the highest stack address to the user code (for stacks
|
|
which grow downwards). */
|
|
pushl %esp
|
|
|
|
pushl %edx /* Push address of the shared library
|
|
termination function. */
|
|
|
|
#ifdef PIC
|
|
/* Load PIC register. */
|
|
call 1f
|
|
addl $_GLOBAL_OFFSET_TABLE_, %ebx
|
|
|
|
/* This used to be the addresses of .fini and .init. */
|
|
pushl $0
|
|
pushl $0
|
|
|
|
pushl %ecx /* Push second argument: argv. */
|
|
pushl %esi /* Push first argument: argc. */
|
|
|
|
# ifdef SHARED
|
|
pushl main@GOT(%ebx)
|
|
# else
|
|
/* Avoid relocation in static PIE since _start is called before
|
|
it is relocated. This also avoid rely on linker optimization to
|
|
transform 'movl main@GOT(%ebx), %eax' to 'leal main@GOTOFF(%ebx)'
|
|
if main is defined locally. */
|
|
leal __wrap_main@GOTOFF(%ebx), %eax
|
|
pushl %eax
|
|
# endif
|
|
|
|
/* Call the user's main function, and exit with its value.
|
|
But let the libc call main. */
|
|
call __libc_start_main@PLT
|
|
#else
|
|
/* This used to be the addresses of .fini and .init. */
|
|
pushl $0
|
|
pushl $0
|
|
|
|
pushl %ecx /* Push second argument: argv. */
|
|
pushl %esi /* Push first argument: argc. */
|
|
|
|
pushl $main
|
|
|
|
/* Call the user's main function, and exit with its value.
|
|
But let the libc call main. */
|
|
call __libc_start_main
|
|
#endif
|
|
|
|
hlt /* Crash if somehow `exit' does return. */
|
|
|
|
#ifdef PIC
|
|
1: movl (%esp), %ebx
|
|
ret
|
|
#endif
|
|
|
|
#if defined PIC && !defined SHARED
|
|
__wrap_main:
|
|
jmp main@PLT
|
|
#endif
|
|
END (_start)
|
|
|
|
/* To fulfill the System V/i386 ABI we need this symbol. Yuck, it's so
|
|
meaningless since we don't support machines < 80386. */
|
|
.section .rodata
|
|
.globl _fp_hw
|
|
_fp_hw: .long 3
|
|
.size _fp_hw, 4
|
|
.type _fp_hw,@object
|
|
|
|
/* Define a symbol for the first piece of initialized data. */
|
|
.data
|
|
.globl __data_start
|
|
__data_start:
|
|
.long 0
|
|
.weak data_start
|
|
data_start = __data_start
|