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authorEric Andersen <andersen@codepoet.org>2001-02-21 18:58:30 +0000
committerEric Andersen <andersen@codepoet.org>2001-02-21 18:58:30 +0000
commit36970cc69149ef3a3f32d57663a14adedaebcbb9 (patch)
treea82e8df0bf9a6771c4b27f9f15c5a2844e8f81ea /libc/sysdeps/linux/sh/crt0.S
parent93ccb0356b10af44f620ec035fb76fa8a1165c22 (diff)
Add an SH port done by Jean-Yves Avenard of Hewlett-Packard - Embedded
and Personal Systems. Thanks! -Erik
Diffstat (limited to 'libc/sysdeps/linux/sh/crt0.S')
-rw-r--r--libc/sysdeps/linux/sh/crt0.S81
1 files changed, 81 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/sh/crt0.S b/libc/sysdeps/linux/sh/crt0.S
new file mode 100644
index 000000000..7808ffd34
--- /dev/null
+++ b/libc/sysdeps/linux/sh/crt0.S
@@ -0,0 +1,81 @@
+/* Startup code for SH & ELF.
+ Copyright (C) 1999 Free Software Foundation, Inc.
+ Copyright (C) 2001 Hewlett-Packard Australia
+
+ 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. 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.
+
+ At this entry point, most registers' values are unspecified, except:
+
+ r4 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.
+ WARNING: At that stage only static linker is supported. For
+ uCLinux we won't bother with r4.
+
+ 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
+
+_start:
+ /* Clear the frame pointer since this is the outermost frame. */
+ mov #0, r14
+
+ /* Pop argc off the stack and save a pointer to argv */
+ mov.l @r15+,r4
+ mov r15, r5
+
+ /* set up the value for the environment pointer
+ r6 = (argc+1)*4+argv
+ */
+ mov r4,r6
+ add #1,r6
+ shll2 r6
+ add r5,r6
+
+ /* call main */
+ mov.l L_main,r1
+ jsr @r1
+ nop
+
+ /* should never get here....*/
+ mov.l L_abort,r1
+ jsr @r1
+ nop
+
+ .align 2
+
+L_main:
+ .long __uClibc_main
+
+L_abort:
+ .long abort
+
+ .data