[uClibc] Single-step into uClibc got 'Cannot access memory at address 0xa646c72'

[Jason Huang]

Hello,

On ARM 925t, I am unable to single-step into _memcpy.S, line 373:

367:.Lmemcpy_bl32:
368:	cmn	r2, #0x10            
369:	ldmgedb	r1!, {r3, r4, r12, lr}	/* blat a remaining 16 bytes */
370:	stmgedb	r0!, {r3, r4, r12, lr}
371:	subge	r2, r2, #0x10         
372:	adds	r2, r2, #0x14         
373:	ldmgedb	r1!, {r3, r12, lr}	/* blat a remaining 12 bytes */
374:	stmgedb	r0!, {r3, r12, lr}
375:	subge	r2, r2, #0x0c         
376:	ldmia	sp!, {r4, lr}

If I did not step into library functions, there was no problem.

My test program is very simple:

int main(int argc, char *argv[])
{
	char buffer[80];
	memcpy(&buffer[0],"Hello world\n",13);
	return EXIT_SUCCESS;
}

I did set solib-absolute-prefix to my toolchain /opt/omap/arm-uclibc-3.4.2/lib.
I tried the prebuilt ARM toolchain from uclibc.org, with the same problem.

Was it caused by MMU paging? 
Or, did I miss something?

Best regards.

Jason Huang