Adapt startup code in x86 and PPC to almost match glibc. _init vs. __libc_csu_init and

_fini vs. __libc_csu_fini remains to do.

libc/misc/internals/__uClibc_main.c

@@ -164,10 +164,11 @@ void attribute_hidden (*__rtld_fini)(void) = NULL;
  * are initialized, just before we call the application's main function.
  */
 void __attribute__ ((__noreturn__))
-__uClibc_start_main(int argc, char **argv, char **envp,
+__uClibc_start_main(int (*main)(int argc, char **argv, char **envp),
+		    int argc, char **argv, char **envp,
 		    void (*app_init)(void), void (*app_fini)(void),
-		    int  (*main)(int argc, char **argv, char **envp),
-		    void (*rtld_fini)(void))
+		    void (*rtld_fini)(void),
+		    void *stack_end)
 {
 #ifdef __ARCH_HAS_MMU__
     unsigned long *aux_dat;

libc/sysdeps/linux/i386/crt1.S

@@ -38,8 +38,9 @@ Cambridge, MA 02139, USA.  */
 
 	.global	_start
 	.type	_start,%function
-	.weak	_init
-	.weak	_fini
+	.type	_init,%function
+	.type	_fini,%function
+	.type	main,%function
 	.type	__uClibc_start_main,%function
 
 _start:
@@ -69,7 +70,6 @@ _start:
 	/* Push NULL to make sure stack ptr
 	   is 16 byte aligned when calling __uClibc_start_main */
 	pushl %ebp
-	pushl %ebp
 	
 	/* Set up an invalid (NULL return address, NULL frame pointer)
 	   callers stack frame so anybody unrolling the stack knows where
@@ -85,15 +85,14 @@ _start:
 	pop %edx
 	addl $_GLOBAL_OFFSET_TABLE_+[.-.L0],%edx
 #endif
+	pushl %esp	/* push stack ptr */
 	pushl %esi	/* Push FINI pointer */
 
 	/* Push apps .init, .fini and main arguments to __uClibc_start_main() on the stack */
 #ifdef L_Scrt1
-	pushl main@GOT(%edx)
 	pushl _fini@GOT(%edx)
 	pushl _init@GOT(%edx)
 #else
-	pushl $main
 	pushl $_fini
 	pushl $_init
 #endif
@@ -105,8 +104,10 @@ _start:
 
 	/* Ok, now run uClibc's main() -- shouldn't return */
 #ifdef L_Scrt1
+	pushl main@GOT(%edx)
 	call *__uClibc_start_main@GOT(%edx)
 #else
+	pushl $main
 	call __uClibc_start_main
 #endif
 

libc/sysdeps/linux/powerpc/crt1.S

@@ -27,60 +27,56 @@
 #define r7      7
 #define r8      8
 #define r9      9
+#define r10     10
 #define r13     13
 #define r31     31
 
 #include <features.h>
 
-	.section ".text"
+.text
 	.globl	_start
-	.type	_start,@function
-	.weak	_init
-	.weak	_fini
-	.type	__uClibc_start_main,%function
-
-/* 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
+	.type	_init,%function
+	.type	_fini,%function
 	.type	main,%function
+	.type	__uClibc_start_main,%function
 
 _start:
-	/* Save the stack pointer, in case we're statically linked under Linux.  */
-	mr	r9,r1
+	mr	r9,r1 	/* Save the stack pointer */
+	clrrwi	r1,r1,4	/* Align stack ptr to 16 bytes */
+	mr	r10,r1 	/* Pass aligned stack ptr */
 #if defined L_Scrt1
 	bl	_GLOBAL_OFFSET_TABLE_-4@local
 	mflr	r31
 #endif
 	/* 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)
-
 	/* find argc from the stack pointer */
-	lwz	r3,0(r9)
+	lwz	r4,0(r9)
 	/* find argv one word offset from the stack pointer */
-	addi	r4,r9,4
+	addi	r5,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
-	mr	r9,r7 /* Pass _dl_fini from ldso */
+	lwz	r6,0(r9)
+	addi	r6,r6,1
+	rlwinm	r6,r6,2,0,29
+	add	r6,r6,r5
+	mr	r9,r7 /* Pass _dl_fini from ldso or NULL if statically linked */
 	/* Ok, now run uClibc's main() -- shouldn't return */
 # ifdef L_Scrt1
 	lwz	r6,_init@got(r31)
 	lwz	r7,_fini@got(r31)
-	lwz	r8,main@got(r31)
+	lwz	r3,main@got(r31)
 	b	__uClibc_start_main@plt
 # 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
+	lis     r7,_fini@ha	# load top 16 bits
 	addi    r7,r7,_fini@l	# load bottom 16 bits
-	lis     r8,main@ha	# load top 16 bits of &msg
-	addi    r8,r8,main@l	# load bottom 16 bits
+	lis     r3,main@ha	# load top 16 bits
+	addi    r3,r3,main@l	# load bottom 16 bits
 	b	__uClibc_start_main
 # endif
 .size _start,.-_start