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authorEric Andersen <andersen@codepoet.org>2003-01-23 13:10:30 +0000
committerEric Andersen <andersen@codepoet.org>2003-01-23 13:10:30 +0000
commitfc0f3ff28e91d51179ba46f2f83108f08eb6af96 (patch)
tree8b44e153cb02c328939c70201b7daf5e431bb3e4 /libc/sysdeps/linux/powerpc/crt0.S
parenta5ccd4df72ddc8a76ee662de645ca85d0d30052f (diff)
Rewrite powerpc crt0.S for proper ctor/dtor handling
Diffstat (limited to 'libc/sysdeps/linux/powerpc/crt0.S')
-rw-r--r--libc/sysdeps/linux/powerpc/crt0.S94
1 files changed, 58 insertions, 36 deletions
diff --git a/libc/sysdeps/linux/powerpc/crt0.S b/libc/sysdeps/linux/powerpc/crt0.S
index 11738ad5b..ec3fbd4ae 100644
--- a/libc/sysdeps/linux/powerpc/crt0.S
+++ b/libc/sysdeps/linux/powerpc/crt0.S
@@ -1,9 +1,5 @@
/*
- * uC-libc/sysdeps/linux/powerpc/crt0.S
- * process init code for powerpc
- *
- * Copyright (C) 2001 by Lineo, Inc.
- * Author: David A. Schleef <ds@schleef.org>
+ * Copyright (C) 2003 by Erik Andersen
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Library General Public License as published by
@@ -18,46 +14,72 @@
* You should have received a copy of the GNU Library General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
-
-/*
- _start is called with the following registers initialized:
-
- r1 null stack frame
- r3 argc
- r4 argv
- r5 envp
- r6 auxiliary vector. ignored.
- r7 function pointer to jump to when main() exits. If
- this is non-zero, it should be registered with atexit().
- Linux always (?) sets r7 to NULL, so it is not implemented
- here.
*/
+/* Integer registers. */
+#define r0 0
+#define r1 1
+#define r2 2
+#define r3 3
+#define r4 4
+#define r5 5
+#define r6 6
+#define r7 7
+#define r8 8
+#define r9 9
+#define r13 13
+#define r31 31
-.text
- .global _start
- .global __uClibc_main
+#include <features.h>
- .type _start,%function
+ .section ".text"
+ .globl _start
+ .type main,%function
+#if defined L_crt0 || ! defined __UCLIBC_CTOR_DTOR__
.type __uClibc_main,%function
+#else
+ .weak _init
+ .weak _fini
+ .type __uClibc_start_main,%function
+#endif
+/* Stick in a dummy reference to main(), so that if an application
+ * is linking when the main() function is in a static library (.a)
+ * we can be sure that main() actually gets linked in */
+ .type _start,@function
_start:
- /* create 2 empty stack frames */
- stwu 1,-32(1)
+ /* Save the stack pointer, in case we're statically linked under Linux. */
+ mr r9,r1
+ /* Set up an initial stack frame, and clear the LR. */
+ clrrwi r1,r1,4
+ li r0,0
+ stwu r1,-16(r1)
+ mtlr r0
+ stw r0,0(r1)
- lwz 3,32(1)
- addi 4,1,36
- addi 5,1,40
- rlwinm 0,3,2,0,29
- add 5,5,0
+ /* find argc from the stack pointer */
+ lwz r3,0(r9)
+ /* find argv one word offset from the stack pointer */
+ addi r4,r9,4
+ /* find environment pointer (argv+argc+1) */
+ lwz r5,0(r9)
+ addi r5,r5,1
+ rlwinm r5,r5,2,0,29
+ add r5,r5,r4
+ /* Ok, now run uClibc's main() -- shouldn't return */
+#if defined L_crt0 || ! defined __UCLIBC_CTOR_DTOR__
bl __uClibc_main
+#else
+ lis r6,_init@ha # load top 16 bits
+ addi r6,r6,_init@l # load bottom 16 bits
+ lis r7,_fini@ha # load top 16 bits of &msg
+ addi r7,r7,_fini@l # load bottom 16 bits
+ bl __uClibc_start_main
+#endif
+.size _start,.-_start
-/* Stick in a dummy reference to main(), so that if an application
- * is linking when the main() function is in a static library (.a)
- * we can be sure that main() actually gets linked in */
-L_dummy_main_reference:
- .long main
+ .section ".data"
+ .globl __data_start
+__data_start: