mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-18 11:00:07 +00:00
7752137a6a
* sysdeps/mach/hurd/mmap.c: Fix inverted test of MAP_FIXED. * stdio/vfscanf.c (number): Allow field width to inhibit first digit after base detection. * stdio/vfprintf.c (vfprintf: %s): Never search past the limit specified by the precision. * grp/grpread.c (__grpscan): New function. * grp/grp.h (__grpscan): Declare it. * grp/getgrgid.c: Use __grpscan. * grp/getgrnam.c: Likewise. * pwd/pwdread.c (__pwdscan): New function. * pwd/pwd.h (__pwdscan): Declare it. * pwd/getpwnam.c: Use __pwdscan. * pwd/getpwuid.c: Likewise. Thu Aug 24 16:29:40 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu> * sysdeps/mach/hurd/mmap.c: Treat (FLAGS & MAP_TYPE) == 0 like MAP_FILE. * hurd/thread-cancel.c: Return EINTR when called on self. * sysdeps/i386/elf/start.S (data_start): Define as weak alias for __data_start.
95 lines
3.3 KiB
ArmAsm
95 lines
3.3 KiB
ArmAsm
/* Startup code compliant to the ELF i386 ABI.
|
|
Copyright (C) 1995 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 Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
/* 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
|
|
*/
|
|
|
|
.text
|
|
.globl _start
|
|
_start:
|
|
/* Clear the frame pointer. The ABI suggests this be done, to mark
|
|
the outermost frame obviously. */
|
|
movl $0, %ebp
|
|
|
|
/* %edx contains the address of the shared library termination
|
|
function, which we will register with `atexit' to be called by
|
|
`exit'. I suspect that on some systems, and when statically
|
|
linked, this will not be set by anything to any function
|
|
pointer; hopefully it will be zero so we don't try to call
|
|
random pointers. */
|
|
testl %edx,%edx
|
|
jz nofini
|
|
pushl %edx
|
|
call atexit
|
|
addl $4, %esp
|
|
nofini:
|
|
|
|
/* Do essential libc initialization. In statically linked
|
|
programs under the GNU Hurd, this is what sets up the
|
|
arguments on the stack for the code below. */
|
|
call __libc_init_first
|
|
|
|
/* Extract the arguments and environment as encoded on the stack
|
|
and set up the arguments for `main': argc, argv, envp. */
|
|
popl %esi /* Pop the argument count. */
|
|
leal 4(%esp,%esi,4), %eax /* envp = &argv[argc + 1] */
|
|
movl %eax, _environ /* Store it in the global variable. */
|
|
pushl %eax /* Push third argument: envp. */
|
|
leal 4(%esp), %eax /* argv starts just above that word. */
|
|
pushl %eax /* Push second argument: argv. */
|
|
pushl %esi /* Push first argument: argc. */
|
|
|
|
/* Call `_init', which is the entry point to our own `.init'
|
|
section; and register with `atexit' to have `exit' call
|
|
`_fini', which is the entry point to our own `.fini' section. */
|
|
call _init
|
|
pushl $_fini
|
|
call atexit
|
|
addl $4, %esp
|
|
|
|
/* Call the user's main function, and exit with its value. */
|
|
call main
|
|
pushl %eax
|
|
call exit /* This should never return. */
|
|
hlt /* Crash if somehow it does return. */
|
|
|
|
/* 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
|