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authorEric Andersen <andersen@codepoet.org>2002-10-01 05:30:25 +0000
committerEric Andersen <andersen@codepoet.org>2002-10-01 05:30:25 +0000
commitb58a631942341b6ccb62ab400e862f404e22dbbf (patch)
tree0c6e622729b6c98417a15c0b7c10279c17ca0038 /libc/sysdeps/linux/arm
parent351c1d9029844a97d2771da883fc2b432d5e1bd4 (diff)
This commit contains a patch from Stefan Allius <allius@atecom.com> to change
how uClibc handles _init and _fini, allowing shared lib constructors and destructors to initialize things in the correct sequence. Stefan ported the SH architecture. I then ported x86, arm, and mips. x86 and arm are working fine, but I don't think I quite got things correct for mips.
Diffstat (limited to 'libc/sysdeps/linux/arm')
-rw-r--r--libc/sysdeps/linux/arm/crt0.S28
1 files changed, 15 insertions, 13 deletions
diff --git a/libc/sysdeps/linux/arm/crt0.S b/libc/sysdeps/linux/arm/crt0.S
index 442c9e84b..dc0ec87d8 100644
--- a/libc/sysdeps/linux/arm/crt0.S
+++ b/libc/sysdeps/linux/arm/crt0.S
@@ -50,20 +50,10 @@ ARM register quick reference:
.text
.global _start
- .global __uClibc_main
-
.type _start,%function
- .type __uClibc_main,%function
.text
_start:
-#if 0 /* some old code the I feel should not be here - davidm */
- @ adjust the data segment base pointer
- ldr r3,=__data_start
- sub sl,sl,r3
- mov BASEREG,sl
-#endif
-
/* clear the frame pointer */
mov fp, #0
@@ -78,10 +68,11 @@ _start:
we find there (hopefully the environment) in r2 */
add r2, r1, r0, lsl #2
add r2, r2, #4
+
#else
/*
- * uClinux stacks look a little different to MMU stacks
- * for no good reason
+ * uClinux stacks look a little different from normal
+ * MMU-full Linux stacks (for no good reason)
*/
/* pull argc, argv and envp off the stack */
ldr r0,[sp, #0]
@@ -89,8 +80,19 @@ _start:
ldr r2,[sp, #8]
#endif
+ /* Store the address of _init in r3 as an argument to main() */
+ ldr r3, =_init
+
+ /* Push _fini onto the stack as the final argument to main() */
+ stmfd sp!, {r0}
+ ldr a1, =_fini
+ stmfd sp!, {r0}
+
/* Ok, now run uClibc's main() -- shouldn't return */
- bl __uClibc_main
+ bl __uClibc_start_main
+
+ /* Crash if somehow `exit' returns anyways. */
+ bl abort
/* Stick in a dummy reference to main(), so that if an application
* is linking when the main() function is in a static library (.a)