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82 lines
2.6 KiB
ArmAsm
82 lines
2.6 KiB
ArmAsm
/* Startup code compliant to the ELF MN10300 ABI.
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Copyright (C) 1995,1996,1997,1998,2000,2001 Free Software Foundation, Inc.
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Contributed by Alexandre Oliva <aoliva@redhat.com>
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Based on ../../i386/elf/start.S.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* This is the canonical entry point, usually the first thing in the text
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segment. The SVR4/i386 ABI (pages 3-31, 3-32) says that when the entry
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point runs, most registers' values are unspecified, except for:
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a0 Contains a function pointer to be registered with `atexit'.
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This is how the dynamic linker arranges to have DT_FINI
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functions called for shared libraries that have been loaded
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before this code runs.
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sp The stack contains the arguments and environment:
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(4,sp) argc
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(8,sp) argv[0]
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...
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(4*(argc+1),sp) NULL
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(4*(argc+2),sp) envp[0]
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...
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NULL
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*/
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#include "bp-sym.h"
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.text
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.globl _start
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.type _start,@function
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_start:
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/* Extract the arguments as encoded on the stack and set up
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the arguments for `main': argc, argv. envp will be determined
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later in __libc_start_main. */
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mov sp,a3
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add -32,sp
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mov a3,(28,sp) /* stack_end. */
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mov d0,(24,sp) /* rtld_fini. */
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mov _fini, d3
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mov d3,(20,sp) /* fini. */
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mov _init, d2
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mov d2,(16,sp) /* init. */
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inc4 a3
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mov a3,(12,sp) /* argv. */
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/* Set the initial frame pointer as 0, so that the bottom of
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the stack is clearly marked. */
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mov 0,a3
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mov (32,sp), d1 /* argc. */
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mov BP_SYM (main), d0 /* main. */
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/* Call the user's main function, and exit with its value.
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But let the libc call main. */
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call BP_SYM (__libc_start_main),[],0
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call BP_SYM (abort),[],0 /* Crash if somehow `exit' does return. */
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/* Define a symbol for the first piece of initialized data. */
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.data
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.globl __data_start
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__data_start:
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.long 0
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.weak data_start
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data_start = __data_start
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