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-/* Startup code compliant to the ELF m68k ABI.
- Copyright (C) 1996, 1997, 1998, 2001, 2002 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, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-/* This is the canonical entry point, usually the first thing in the text
- segment. The SVR4/m68k ABI says that when the entry point runs,
- most registers' values are unspecified, except for:
-
- %a1 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.
-
- %sp The stack contains the arguments and environment:
- 0(%sp) argc
- 4(%sp) argv[0]
- ...
- (4*argc)(%sp) NULL
- (4*(argc+1))(%sp) envp[0]
- ...
- NULL
-*/
-
- .text
- .globl _start
- .type _start,@function
-_start:
- /* Clear the frame pointer. The ABI suggests this be done, to mark
- the outermost frame obviously. */
- sub.l %fp, %fp
-
- /* 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. */
- move.l (%sp)+, %d0 /* Pop the argument count. */
- move.l %sp, %a0 /* The argument vector starts just at the
- current stack top. */
-
- /* Provide the highest stack address to the user code (for stacks
- which grow downward). */
- pea (%sp)
-
- pea (%a1) /* Push address of the shared library
- termination function. */
-
- /* Push the address of our own entry points to `.fini' and
- `.init'. */
- pea __libc_csu_fini
- pea __libc_csu_init
-
- pea (%a0) /* Push second argument: argv. */
- move.l %d0, -(%sp) /* Push first argument: argc. */
-
- pea main
-
- /* Call the user's main function, and exit with its value. But
- let the libc call main. */
- jbsr __libc_start_main
-
- illegal /* Crash if somehow `exit' 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