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+! gcrt1.s for Solaris 2, x86
+
+! Copyright (C) 1993, 2008, 2009 Free Software Foundation, Inc.
+! Written By Fred Fish, Nov 1992
+!
+! 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
+! Free Software Foundation; either version 3, or (at your option) any
+! later version.
+!
+! This file 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
+! General Public License for more details.
+!
+! Under Section 7 of GPL version 3, you are granted additional
+! permissions described in the GCC Runtime Library Exception, version
+! 3.1, as published by the Free Software Foundation.
+!
+! You should have received a copy of the GNU General Public License and
+! a copy of the GCC Runtime Library Exception along with this program;
+! see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+! <http://www.gnu.org/licenses/>.
+
+
+! This file takes control of the process from the kernel, as specified
+! in section 3 of the System V Application Binary Interface, Intel386
+! Processor Supplement. It has been constructed from information obtained
+! from the ABI, information obtained from single stepping existing
+! Solaris executables through their startup code with gdb, and from
+! information obtained by single stepping executables on other i386 SVR4
+! implementations. This file is the first thing linked into any executable.
+
+! This is a modified crt1.s by J.W.Hawtin <oolon@ankh.org> 15/8/96,
+! to allow program profiling, by calling monstartup on entry and _mcleanup
+! on exit
+
+ .ident "GNU C gcrt1.s"
+ .weak _DYNAMIC
+ .text
+
+! 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
+! (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
+! are unspecified at process initialization).
+
+ .globl _start
+_start:
+ pushl $0x0
+ pushl $0x0
+ movl %esp,%ebp
+
+! As specified per page 3-32 of the ABI, %edx contains a function
+! pointer that should be registered with atexit(), for proper
+! shared object termination. Just push it onto the stack for now
+! to preserve it. We want to register _cleanup() first.
+
+ pushl %edx
+
+! 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
+! atexit().
+
+ movl $_mcleanup,%eax
+ testl %eax,%eax
+ je .L1
+ pushl $_mcleanup
+ call atexit
+ addl $0x4,%esp
+.L1:
+
+! 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
+! now conveniently saved on the stack as the argument to pass to
+! atexit().
+
+ movl $_DYNAMIC,%eax
+ testl %eax,%eax
+ je .L2
+ call atexit
+.L2:
+
+! Register _fini() with atexit(). We will take care of calling _init()
+! directly.
+
+ pushl $_fini
+ call atexit
+
+! Start profiling
+
+ pushl %ebp
+ movl %esp,%ebp
+ pushl $_etext
+ pushl $_start
+ call monstartup
+ addl $8,%esp
+ popl %ebp
+
+! Compute the address of the environment vector on the stack and load
+! it into the global variable _environ. Currently argc is at 8 off
+! 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
+! 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,
+! off the frame pointer (whew!).
+
+ movl 8(%ebp),%eax
+ leal 16(%ebp,%eax,4),%edx
+ movl %edx,_environ
+
+! Push the environment vector pointer, the argument vector pointer,
+! and the argument count on to the stack to set up the arguments
+! for _init(), _fpstart(), and main(). Note that the environment
+! vector pointer and the arg count were previously loaded into
+! %edx and %eax respectively. The only new value we need to compute
+! is the argument vector pointer, which is at a fixed address off
+! the initial frame pointer.
+
+!
+! Make sure the stack is properly aligned.
+!
+ andl $0xfffffff0,%esp
+ subl $4,%esp
+
+ pushl %edx
+ leal 12(%ebp),%edx
+ pushl %edx
+ pushl %eax
+
+! Call _init(argc, argv, environ), _fpstart(argc, argv, environ), and
+! main(argc, argv, environ).
+
+ call _init
+ call __fpstart
+ call main
+
+! Pop the argc, argv, and environ arguments off the stack, push the
+! value returned from main(), and call exit().
+
+ addl $12,%esp
+ pushl %eax
+ call exit
+
+! An inline equivalent of _exit, as specified in Figure 3-26 of the ABI.
+
+ pushl $0x0
+ movl $0x1,%eax
+ lcall $7,$0
+
+! If all else fails, just try a halt!
+
+ hlt
+ .type _start,@function
+ .size _start,.-_start