Reconstructed from http://lists.arm.linux.org.uk/pipermail/linux-arm-kernel/2003-December/018647.html
See also http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=1540

Message-ID: <DDA001.8070502@de.bosch.com>
Subject: Help cross compiling the kernel for arm.
From: dirk.behme at de.bosch.com

Aitor Garcia wrote:
> Hello everybody,
> 
> I am having problems cross compiling the kernel for arm.
> 
> This is the error message I get:
> 
> blkpg.c: In function `blk_ioctl':
> blkpg.c:252: error: asm-specifier for variable `__r1' conflicts with asm clobber list
> blkpg.c:252: confused by earlier errors, bailing out make[3]: *** [blkpg.o] Error 1
> make[3]: Leaving directory `/root/toolchain/kernel-arm/linux-2.4.21/drivers/block'
> make[2]: *** [first_rule] Error 2
> make[2]: Leaving directory `/root/toolchain/kernel-arm/linux-2.4.21/drivers/block'
> make[1]: *** [_subdir_block] Error 2
> make[1]: Leaving directory `/root/toolchain/kernel-arm/linux-2.4.21/drivers'
> make: *** [_dir_drivers] Error 2
> 
> These are the toolchain versions I am using:
>  host=i686-pc-linux-gnu
>  binutils_version=2.14           
>  gcc_version=3.3.2                
>  glibc_version=2.3.2             
>  kernel_version=2.4.21  
> and applied the kernel patch for arm. 2.4.21-rmk1.
> ... 
> I have also seen references to this bug in ARM linux
> Developer. Patch Number = 1540. But this patch is
> classified as discarded.

You need something like 1540 to compile 2.4.21 with gcc 3.3.2. 1540 was 
discarded because of AFLAGS change.

Try the attachment.

Dirk
-------------- next part --------------
--- linux/arch/arm/lib/getuser.S.orig	Mon Nov 17 07:41:51 2003
+++ linux/arch/arm/lib/getuser.S	Mon Nov 17 07:43:16 2003
@@ -17,7 +17,7 @@
  *
  * Inputs:	r0 contains the address
  * Outputs:	r0 is the error code
- *		r1, r2 contains the zero-extended value
+ *		r1, ip contains the zero-extended value
  *		lr corrupted
  *
  * No other registers must be altered.  (see include/asm-arm/uaccess.h
@@ -42,14 +42,14 @@ __get_user_1:
 
 	.global	__get_user_2
 __get_user_2:
-	bic	r2, sp, #0x1f00
-	bic	r2, r2, #0x00ff
-	ldr	r2, [r2, #TSK_ADDR_LIMIT]
-	sub	r2, r2, #2
-	cmp	r0, r2
+	bic	ip, sp, #0x1f00
+	bic	ip, ip, #0x00ff
+	ldr	ip, [ip, #TSK_ADDR_LIMIT]
+	sub	ip, ip, #2
+	cmp	r0, ip
 2:	ldrlsbt	r1, [r0], #1
-3:	ldrlsbt	r2, [r0]
-	orrls	r1, r1, r2, lsl #8
+3:	ldrlsbt	ip, [r0]
+	orrls	r1, r1, ip, lsl #8
 	movls	r0, #0
 	movls	pc, lr
 	b	__get_user_bad
@@ -68,20 +68,20 @@ __get_user_4:
 
 	.global	__get_user_8
 __get_user_8:
-	bic	r2, sp, #0x1f00
-	bic	r2, r2, #0x00ff
-	ldr	r2, [r2, #TSK_ADDR_LIMIT]
-	sub	r2, r2, #8
-	cmp	r0, r2
+	bic	ip, sp, #0x1f00
+	bic	ip, ip, #0x00ff
+	ldr	ip, [ip, #TSK_ADDR_LIMIT]
+	sub	ip, ip, #8
+	cmp	r0, ip
 5:	ldrlst	r1, [r0], #4
-6:	ldrlst	r2, [r0]
+6:	ldrlst	ip, [r0]
 	movls	r0, #0
 	movls	pc, lr
 
 	/* fall through */
 
 __get_user_bad_8:
-	mov	r2, #0
+	mov	ip, #0
 __get_user_bad:
 	mov	r1, #0
 	mov	r0, #-14
--- linux/arch/arm/lib/putuser.S.orig	Mon Nov 17 07:41:57 2003
+++ linux/arch/arm/lib/putuser.S	Mon Nov 17 07:42:26 2003
@@ -16,7 +16,7 @@
  * __put_user_X
  *
  * Inputs:	r0 contains the address
- *		r1, r2 contains the value
+ *		r1, ip contains the value
  * Outputs:	r0 is the error code
  *		lr corrupted
  *
@@ -30,11 +30,11 @@
 
 	.global	__put_user_1
 __put_user_1:
-	bic	r2, sp, #0x1f00
-	bic	r2, r2, #0x00ff
-	ldr	r2, [r2, #TSK_ADDR_LIMIT]
-	sub	r2, r2, #1
-	cmp	r0, r2
+	bic	ip, sp, #0x1f00
+	bic	ip, ip, #0x00ff
+	ldr	ip, [ip, #TSK_ADDR_LIMIT]
+	sub	ip, ip, #1
+	cmp	r0, ip
 1:	strlsbt	r1, [r0]
 	movls	r0, #0
 	movls	pc, lr
@@ -42,11 +42,11 @@ __put_user_1:
 
 	.global	__put_user_2
 __put_user_2:
-	bic	r2, sp, #0x1f00
-	bic	r2, r2, #0x00ff
-	ldr	r2, [r2, #TSK_ADDR_LIMIT]
-	sub	r2, r2, #2
-	cmp	r0, r2
+	bic	ip, sp, #0x1f00
+	bic	ip, ip, #0x00ff
+	ldr	ip, [ip, #TSK_ADDR_LIMIT]
+	sub	ip, ip, #2
+	cmp	r0, ip
 2:	strlsbt	r1, [r0], #1
 	movls	r1, r1, lsr #8
 3:	strlsbt	r1, [r0]
@@ -56,11 +56,11 @@ __put_user_2:
 
 	.global	__put_user_4
 __put_user_4:
-	bic	r2, sp, #0x1f00
-	bic	r2, r2, #0x00ff
-	ldr	r2, [r2, #TSK_ADDR_LIMIT]
-	sub	r2, r2, #4
-	cmp	r0, r2
+	bic	ip, sp, #0x1f00
+	bic	ip, ip, #0x00ff
+	ldr	ip, [ip, #TSK_ADDR_LIMIT]
+	sub	ip, ip, #4
+	cmp	r0, ip
 4:	strlst	r1, [r0]
 	movls	r0, #0
 	movls	pc, lr
@@ -74,7 +74,7 @@ __put_user_8:
 	sub	ip, ip, #8
 	cmp	r0, ip
 5:	strlst	r1, [r0], #4
-6:	strlst	r2, [r0]
+6:	strlst	ip, [r0]
 	movls	r0, #0
 	movls	pc, lr
 
--- linux/include/asm-arm/uaccess.h.orig	Mon Nov 17 07:41:04 2003
+++ linux/include/asm-arm/uaccess.h	Mon Nov 17 07:41:37 2003
@@ -86,7 +86,7 @@ extern int __get_user_bad(void);
 			__get_user_x(__r1, __p, __e, 1, "lr");		\
 	       		break;						\
 		case 2:							\
-			__get_user_x(__r1, __p, __e, 2, "r2", "lr");	\
+			__get_user_x(__r1, __p, __e, 2, "ip", "lr");	\
 			break;						\
 		case 4:							\
 	       		__get_user_x(__r1, __p, __e, 4, "lr");		\
@@ -122,13 +122,13 @@ extern int __put_user_bad(void);
 		register int __e asm("r0");				\
 		switch (sizeof(*(p))) {					\
 		case 1:							\
-			__put_user_x(__r1, __p, __e, 1, "r2", "lr");	\
+			__put_user_x(__r1, __p, __e, 1, "ip", "lr");	\
 			break;						\
 		case 2:							\
-			__put_user_x(__r1, __p, __e, 2, "r2", "lr");	\
+			__put_user_x(__r1, __p, __e, 2, "ip", "lr");	\
 			break;						\
 		case 4:							\
-			__put_user_x(__r1, __p, __e, 4, "r2", "lr");	\
+			__put_user_x(__r1, __p, __e, 4, "ip", "lr");	\
 			break;						\
 		case 8:							\
 			__put_user_x(__r1, __p, __e, 8, "ip", "lr");	\