From bf126cb24e809f36067ce43f9186cbe53b906cad Mon Sep 17 00:00:00 2001
From: David McCullough <davidm@snapgear.com>
Date: Wed, 19 Dec 2001 03:43:54 +0000
Subject: merged the two startup files so that uClinux people always get the
 correct arg processing whether they are using PIC or not,  and vice-versa for
 the MMU folks.

---
 libc/sysdeps/linux/arm/Makefile  |  6 +---
 libc/sysdeps/linux/arm/crt0.S    | 30 +++++++++++++++++++
 libc/sysdeps/linux/arm/crt0pic.S | 65 ----------------------------------------
 3 files changed, 31 insertions(+), 70 deletions(-)
 delete mode 100644 libc/sysdeps/linux/arm/crt0pic.S

(limited to 'libc/sysdeps/linux/arm')

diff --git a/libc/sysdeps/linux/arm/Makefile b/libc/sysdeps/linux/arm/Makefile
index 009d7d8e1..1e08d094b 100644
--- a/libc/sysdeps/linux/arm/Makefile
+++ b/libc/sysdeps/linux/arm/Makefile
@@ -26,11 +26,7 @@ ASFLAGS=$(CFLAGS)
 
 TARGET_MACHINE_TYPE=$(shell $(CC) -dumpmachine)
 
-ifeq ($(DOPIC),true)
-    CRT0=crt0pic.S
-else
-    CRT0=crt0.S
-endif
+CRT0=crt0.S
 CRT0_OBJ=crt0.o
 
 SSRC=longjmp.S setjmp.S vfork.S
diff --git a/libc/sysdeps/linux/arm/crt0.S b/libc/sysdeps/linux/arm/crt0.S
index 65253881c..de7ef7848 100644
--- a/libc/sysdeps/linux/arm/crt0.S
+++ b/libc/sysdeps/linux/arm/crt0.S
@@ -6,6 +6,18 @@
 	NULL
         env[0...N]      environment variables (pointers)
         NULL
+
+   For uClinux it looks like this:
+
+        argc            argument counter (integer)
+        argv            char *argv[]
+        envp            char *envp[]
+        argv[0]         program name (pointer)
+        argv[1...N]     program args (pointers)
+        argv[argc-1]    end of args (integer)
+	NULL
+        env[0...N]      environment variables (pointers)
+        NULL
 	
    When we are done here, we want
 	a1=argc
@@ -34,6 +46,7 @@ ARM register quick reference:
     pc      r15          program counter
 */
 
+#include <features.h>
 
 .text
 	.global _start
@@ -44,10 +57,17 @@ ARM register quick reference:
 
 .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
 
+#ifdef __UCLIBC_HAS_MMU__
 	/* Load register r0 (argc) from the stack to its final resting place */
 	ldr     r0, [sp], #4
 
@@ -58,6 +78,16 @@ _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
+	 */
+	/* pull argc, argv and envp off the stack */
+	ldr r0,[sp, #0]
+	ldr r1,[sp, #4]
+	ldr r2,[sp, #8]
+#endif
 
 	/* Ok, now run uClibc's main() -- shouldn't return */
 	bl	__uClibc_main
diff --git a/libc/sysdeps/linux/arm/crt0pic.S b/libc/sysdeps/linux/arm/crt0pic.S
deleted file mode 100644
index 7cb26e80e..000000000
--- a/libc/sysdeps/linux/arm/crt0pic.S
+++ /dev/null
@@ -1,65 +0,0 @@
-/* When we enter this piece of code, the program stack looks like this:
-        argc            argument counter (integer)
-        argv[0]         program name (pointer)
-        argv[1...N]     program args (pointers)
-        argv[argc-1]    end of args (integer)
-	NULL
-        env[0...N]      environment variables (pointers)
-        NULL
-	
-   When we are done here, we want
-	a1=argc
-	a2=argv[0]
-	a3=argv[argc+1]
-
-ARM register quick reference:
-
-    Name    Number       ARM Procedure Calling Standard Role
-
-    a1      r0           argument 1 / integer result / scratch register / argc
-    a2      r1           argument 2 / scratch register / argv
-    a3      r2           argument 3 / scratch register / envp
-    a4      r3           argument 4 / scratch register
-    v1      r4           register variable
-    v2      r5           register variable
-    v3      r6           register variable
-    v4      r7           register variable
-    v5      r8           register variable
-    sb/v6   r9           static base / register variable
-    sl/v7   r10          stack limit / stack chunk handle / reg. variable
-    fp      r11          frame pointer
-    ip      r12          scratch register / new-sb in inter-link-unit calls
-    sp      r13          lower end of current stack frame
-    lr      r14          link address / scratch register
-    pc      r15          program counter
-*/
-
-.text
-	.global _start
-	.global __uClibc_main
-
-	.type   _start,%function
-	.type   __uClibc_main,%function
-
-
-@ r0 = argc
-@ r1 = argv
-@ r2 = envp
-@ sl = data segment
-#define BASEREG	    r9
-
-.text
-_start:
-	@ adjust the data segment base pointer
-	ldr r3,=__data_start
-	sub sl,sl,r3
-	mov BASEREG,sl
-
-	/* pull argc, argv and envp off the stack */
-	ldr r0,[sp, #0]
-	ldr r1,[sp, #4]
-	ldr r2,[sp, #8]
-
-	/* Ok, now run uClibc's main() -- shouldn't return */
-	bl	__uClibc_main
-
-- 
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