ARM/AT91 build failure: Error: symbol *ABS* is in a different section

ARM/AT91 build failure: Error: symbol *ABS* is in a different section

[Thomas Petazzoni]

Hello,

In barebox 2010.05, the at91sam9263ek defconfig was building properly
with my 2009q1 CodeSourcery ARM toolchain. Barebox 2010.06 no longer
builds with the same defconfig/toolchain. The build failure is:

  CC      arch/arm/cpu/start.o
{standard input}: Assembler messages:
{standard input}:37: Error: symbol *ABS* is in a different section

The commit that introduced the regression is
78104ae181f78d83664fdc7522eb632d9c3b2ec9 (i.e "arm: reimplement startup
code in C").

The part causing the problem is in board_init_lowlevel_return(), more
precisely

    /* Get runtime address of this function */
    __asm__ __volatile__("adr %0, 0":"=r"(r));

I have investigated further for the moment.

Best regards,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

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Re: ARM/AT91 build failure: Error: symbol *ABS* is in a different section

[Sascha Hauer]

Hi Thomas,

On Sat, Jun 12, 2010 at 03:51:21PM +0200, Thomas Petazzoni wrote:
> Hello,
> 
> In barebox 2010.05, the at91sam9263ek defconfig was building properly
> with my 2009q1 CodeSourcery ARM toolchain. Barebox 2010.06 no longer
> builds with the same defconfig/toolchain. The build failure is:
> 
>   CC      arch/arm/cpu/start.o
> {standard input}: Assembler messages:
> {standard input}:37: Error: symbol *ABS* is in a different section
> 
> The commit that introduced the regression is
> 78104ae181f78d83664fdc7522eb632d9c3b2ec9 (i.e "arm: reimplement startup
> code in C").
> 
> The part causing the problem is in board_init_lowlevel_return(), more
> precisely
> 
>     /* Get runtime address of this function */
>     __asm__ __volatile__("adr %0, 0":"=r"(r));
> 
> I have investigated further for the moment.

This was mentioned before and the result was the following patch. Sorry,
somehow I forgot to check it in. It's now in the master branch.

Sascha

commit c21a7fb9f15ee1fb213e22c0e7a9d0f53b274cb2
Author: Sascha Hauer <s.hauer@pengutronix.de>
Date:   Wed May 19 13:23:43 2010 +0200

    arm start.c: Make runtime function address calculation tolerant for more compilers
    
    Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

diff --git a/arch/arm/cpu/start.c b/arch/arm/cpu/start.c
index 67d54a6..eea7dcf 100644
--- a/arch/arm/cpu/start.c
+++ b/arch/arm/cpu/start.c
@@ -81,21 +81,24 @@ void __naked __bare_init reset(void)
  */
 void __naked __bare_init board_init_lowlevel_return(void)
 {
-	uint32_t r;
+	uint32_t r, addr;
+
+	/*
+	 * Get runtime address of this function. Do not
+	 * put any code above this.
+	 */
+	__asm__ __volatile__("1: adr %0, 1b":"=r"(addr));
 
 	/* Setup the stack */
 	r = STACK_BASE + STACK_SIZE - 16;
 	__asm__ __volatile__("mov sp, %0" : : "r"(r));
 
-	/* Get runtime address of this function */
-	__asm__ __volatile__("adr %0, 0":"=r"(r));
-
 	/* Get start of binary image */
-	r -= (uint32_t)&board_init_lowlevel_return - TEXT_BASE;
+	addr -= (uint32_t)&board_init_lowlevel_return - TEXT_BASE;
 
 	/* relocate to link address if necessary */
-	if (r != TEXT_BASE)
-		memcpy((void *)TEXT_BASE, (void *)r,
+	if (addr != TEXT_BASE)
+		memcpy((void *)TEXT_BASE, (void *)addr,
 				(unsigned int)&__bss_start - TEXT_BASE);
 
 	/* clear bss */

-- 
Pengutronix e.K.                           |                             |
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