! gcrt1.s for Solaris 2, x86
|
! gcrt1.s for Solaris 2, x86
|
|
|
! Copyright (C) 1993 Free Software Foundation, Inc.
|
! Copyright (C) 1993 Free Software Foundation, Inc.
|
! Written By Fred Fish, Nov 1992
|
! Written By Fred Fish, Nov 1992
|
!
|
!
|
! This file is free software; you can redistribute it and/or modify it
|
! This file is free software; you can redistribute it and/or modify it
|
! under the terms of the GNU General Public License as published by the
|
! under the terms of the GNU General Public License as published by the
|
! Free Software Foundation; either version 2, or (at your option) any
|
! Free Software Foundation; either version 2, or (at your option) any
|
! later version.
|
! later version.
|
!
|
!
|
! In addition to the permissions in the GNU General Public License, the
|
! In addition to the permissions in the GNU General Public License, the
|
! Free Software Foundation gives you unlimited permission to link the
|
! Free Software Foundation gives you unlimited permission to link the
|
! compiled version of this file with other programs, and to distribute
|
! compiled version of this file with other programs, and to distribute
|
! those programs without any restriction coming from the use of this
|
! those programs without any restriction coming from the use of this
|
! file. (The General Public License restrictions do apply in other
|
! file. (The General Public License restrictions do apply in other
|
! respects; for example, they cover modification of the file, and
|
! respects; for example, they cover modification of the file, and
|
! distribution when not linked into another program.)
|
! distribution when not linked into another program.)
|
!
|
!
|
! This file is distributed in the hope that it will be useful, but
|
! This file is distributed in the hope that it will be useful, but
|
! WITHOUT ANY WARRANTY; without even the implied warranty of
|
! WITHOUT ANY WARRANTY; without even the implied warranty of
|
! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
! General Public License for more details.
|
! General Public License for more details.
|
!
|
!
|
! You should have received a copy of the GNU General Public License
|
! You should have received a copy of the GNU General Public License
|
! along with this program; see the file COPYING. If not, write to
|
! along with this program; see the file COPYING. If not, write to
|
! the Free Software Foundation, 51 Franklin Street, Fifth Floor,
|
! the Free Software Foundation, 51 Franklin Street, Fifth Floor,
|
! Boston, MA 02110-1301, USA.
|
! Boston, MA 02110-1301, USA.
|
!
|
!
|
! As a special exception, if you link this library with files
|
! As a special exception, if you link this library with files
|
! compiled with GCC to produce an executable, this does not cause
|
! compiled with GCC to produce an executable, this does not cause
|
! the resulting executable to be covered by the GNU General Public License.
|
! the resulting executable to be covered by the GNU General Public License.
|
! This exception does not however invalidate any other reasons why
|
! This exception does not however invalidate any other reasons why
|
! the executable file might be covered by the GNU General Public License.
|
! the executable file might be covered by the GNU General Public License.
|
!
|
!
|
|
|
! This file takes control of the process from the kernel, as specified
|
! This file takes control of the process from the kernel, as specified
|
! in section 3 of the System V Application Binary Interface, Intel386
|
! in section 3 of the System V Application Binary Interface, Intel386
|
! Processor Supplement. It has been constructed from information obtained
|
! Processor Supplement. It has been constructed from information obtained
|
! from the ABI, information obtained from single stepping existing
|
! from the ABI, information obtained from single stepping existing
|
! Solaris executables through their startup code with gdb, and from
|
! Solaris executables through their startup code with gdb, and from
|
! information obtained by single stepping executables on other i386 SVR4
|
! information obtained by single stepping executables on other i386 SVR4
|
! implementations. This file is the first thing linked into any executable.
|
! implementations. This file is the first thing linked into any executable.
|
|
|
! This is a modified crt1.s by J.W.Hawtin 15/8/96,
|
! This is a modified crt1.s by J.W.Hawtin 15/8/96,
|
! to allow program profiling, by calling monstartup on entry and _mcleanup
|
! to allow program profiling, by calling monstartup on entry and _mcleanup
|
! on exit
|
! on exit
|
|
|
.file "gcrt1.s"
|
.file "gcrt1.s"
|
.ident "GNU C gcrt1.s"
|
.ident "GNU C gcrt1.s"
|
.weak _DYNAMIC
|
.weak _DYNAMIC
|
.text
|
.text
|
|
|
! Start creating the initial frame by pushing a NULL value for the return
|
! Start creating the initial frame by pushing a NULL value for the return
|
! address of the initial frame, and mark the end of the stack frame chain
|
! address of the initial frame, and mark the end of the stack frame chain
|
! (the innermost stack frame) with a NULL value, per page 3-32 of the ABI.
|
! (the innermost stack frame) with a NULL value, per page 3-32 of the ABI.
|
! Initialize the first stack frame pointer in %ebp (the contents of which
|
! Initialize the first stack frame pointer in %ebp (the contents of which
|
! are unspecified at process initialization).
|
! are unspecified at process initialization).
|
|
|
.globl _start
|
.globl _start
|
_start:
|
_start:
|
pushl $0x0
|
pushl $0x0
|
pushl $0x0
|
pushl $0x0
|
movl %esp,%ebp
|
movl %esp,%ebp
|
|
|
! As specified per page 3-32 of the ABI, %edx contains a function
|
! As specified per page 3-32 of the ABI, %edx contains a function
|
! pointer that should be registered with atexit(), for proper
|
! pointer that should be registered with atexit(), for proper
|
! shared object termination. Just push it onto the stack for now
|
! shared object termination. Just push it onto the stack for now
|
! to preserve it. We want to register _cleanup() first.
|
! to preserve it. We want to register _cleanup() first.
|
|
|
pushl %edx
|
pushl %edx
|
|
|
! Check to see if there is an _cleanup() function linked in, and if
|
! Check to see if there is an _cleanup() function linked in, and if
|
! so, register it with atexit() as the last thing to be run by
|
! so, register it with atexit() as the last thing to be run by
|
! atexit().
|
! atexit().
|
|
|
movl $_mcleanup,%eax
|
movl $_mcleanup,%eax
|
testl %eax,%eax
|
testl %eax,%eax
|
je .L1
|
je .L1
|
pushl $_mcleanup
|
pushl $_mcleanup
|
call atexit
|
call atexit
|
addl $0x4,%esp
|
addl $0x4,%esp
|
.L1:
|
.L1:
|
|
|
! Now check to see if we have an _DYNAMIC table, and if so then
|
! Now check to see if we have an _DYNAMIC table, and if so then
|
! we need to register the function pointer previously in %edx, but
|
! we need to register the function pointer previously in %edx, but
|
! now conveniently saved on the stack as the argument to pass to
|
! now conveniently saved on the stack as the argument to pass to
|
! atexit().
|
! atexit().
|
|
|
movl $_DYNAMIC,%eax
|
movl $_DYNAMIC,%eax
|
testl %eax,%eax
|
testl %eax,%eax
|
je .L2
|
je .L2
|
call atexit
|
call atexit
|
.L2:
|
.L2:
|
|
|
! Register _fini() with atexit(). We will take care of calling _init()
|
! Register _fini() with atexit(). We will take care of calling _init()
|
! directly.
|
! directly.
|
|
|
pushl $_fini
|
pushl $_fini
|
call atexit
|
call atexit
|
|
|
! Start profiling
|
! Start profiling
|
|
|
pushl %ebp
|
pushl %ebp
|
movl %esp,%ebp
|
movl %esp,%ebp
|
pushl $_etext
|
pushl $_etext
|
pushl $_start
|
pushl $_start
|
call monstartup
|
call monstartup
|
addl $8,%esp
|
addl $8,%esp
|
popl %ebp
|
popl %ebp
|
|
|
! Compute the address of the environment vector on the stack and load
|
! Compute the address of the environment vector on the stack and load
|
! it into the global variable _environ. Currently argc is at 8 off
|
! it into the global variable _environ. Currently argc is at 8 off
|
! the frame pointer. Fetch the argument count into %eax, scale by the
|
! the frame pointer. Fetch the argument count into %eax, scale by the
|
! size of each arg (4 bytes) and compute the address of the environment
|
! size of each arg (4 bytes) and compute the address of the environment
|
! vector which is 16 bytes (the two zero words we pushed, plus argc,
|
! vector which is 16 bytes (the two zero words we pushed, plus argc,
|
! plus the null word terminating the arg vector) further up the stack,
|
! plus the null word terminating the arg vector) further up the stack,
|
! off the frame pointer (whew!).
|
! off the frame pointer (whew!).
|
|
|
movl 8(%ebp),%eax
|
movl 8(%ebp),%eax
|
leal 16(%ebp,%eax,4),%edx
|
leal 16(%ebp,%eax,4),%edx
|
movl %edx,_environ
|
movl %edx,_environ
|
|
|
! Push the environment vector pointer, the argument vector pointer,
|
! Push the environment vector pointer, the argument vector pointer,
|
! and the argument count on to the stack to set up the arguments
|
! and the argument count on to the stack to set up the arguments
|
! for _init(), _fpstart(), and main(). Note that the environment
|
! for _init(), _fpstart(), and main(). Note that the environment
|
! vector pointer and the arg count were previously loaded into
|
! vector pointer and the arg count were previously loaded into
|
! %edx and %eax respectively. The only new value we need to compute
|
! %edx and %eax respectively. The only new value we need to compute
|
! is the argument vector pointer, which is at a fixed address off
|
! is the argument vector pointer, which is at a fixed address off
|
! the initial frame pointer.
|
! the initial frame pointer.
|
|
|
!
|
!
|
! Make sure the stack is properly aligned.
|
! Make sure the stack is properly aligned.
|
!
|
!
|
andl $0xfffffff0,%esp
|
andl $0xfffffff0,%esp
|
subl $4,%esp
|
subl $4,%esp
|
|
|
pushl %edx
|
pushl %edx
|
leal 12(%ebp),%edx
|
leal 12(%ebp),%edx
|
pushl %edx
|
pushl %edx
|
pushl %eax
|
pushl %eax
|
|
|
! Call _init(argc, argv, environ), _fpstart(argc, argv, environ), and
|
! Call _init(argc, argv, environ), _fpstart(argc, argv, environ), and
|
! main(argc, argv, environ).
|
! main(argc, argv, environ).
|
|
|
call _init
|
call _init
|
call __fpstart
|
call __fpstart
|
call main
|
call main
|
|
|
! Pop the argc, argv, and environ arguments off the stack, push the
|
! Pop the argc, argv, and environ arguments off the stack, push the
|
! value returned from main(), and call exit().
|
! value returned from main(), and call exit().
|
|
|
addl $12,%esp
|
addl $12,%esp
|
pushl %eax
|
pushl %eax
|
call exit
|
call exit
|
|
|
! An inline equivalent of _exit, as specified in Figure 3-26 of the ABI.
|
! An inline equivalent of _exit, as specified in Figure 3-26 of the ABI.
|
|
|
pushl $0x0
|
pushl $0x0
|
movl $0x1,%eax
|
movl $0x1,%eax
|
lcall $7,$0
|
lcall $7,$0
|
|
|
! If all else fails, just try a halt!
|
! If all else fails, just try a halt!
|
|
|
hlt
|
hlt
|
.type _start,@function
|
.type _start,@function
|
.size _start,.-_start
|
.size _start,.-_start
|
|
|
