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/* Startup code compliant to the ELF Mips ABI.
Copyright (C) 1995, 1997, 2000, 2001, 2002, 2003, 2004
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. */
#include <features.h>
#include <sys/regdef.h>
/* This is the canonical entry point, usually the first thing in the text
segment. The SVR4/Mips ABI (pages 3-31, 3-32) says that when the entry
point runs, most registers' values are unspecified, except for:
v0 ($2) 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 ($29) 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
ra ($31) The return address register is set to zero so that programs
that search backword through stack frames recognize the last
stack frame.
*/
/* We need to call:
__uClibc_start_main (int (*main) (int, char **, char **), int argc,
char **argv, void (*init) (void), void (*fini) (void),
void (*rtld_fini) (void), void *stack_end)
*/
.text
.global __start
.type __start,%function
.type _init,%function
.type _fini,%function
.type main,%function
.type __uClibc_start_main,%function
__start:
#ifdef __PIC__
.set noreorder
move $0, $31 /* Save old ra. */
bal 10f /* Find addr of cpload. */
nop
10:
.cpload $31;
move $31, $0;
.set reorder
#else
la $28, _gp /* Setup GP correctly if we're non-PIC. */
move $31, $0
#endif
la $4, main /* main */
lw $5, 0($29) /* argc */
addiu $6, $29, 4 /* argv */
/* Allocate space on the stack for seven arguments (o32 only)
and make sure the stack is aligned to double words (8 bytes)
on o32 and quad words (16 bytes) on n32 and n64. */
and $29, -2 * 4
subu $29, 32
la $7, _init /* init */
la $8, _fini
sw $8, 16($29) /* fini */
sw $2, 20($29) /* rtld_fini */
sw $29, 24($29) /* stack_end */
jal __uClibc_start_main
hlt:
/* Crash if somehow `__uClibc_start_main' returns anyway. */
b hlt
/* 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
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