From: Jurij Smakov <jurij@xxxxxxxxx> Date: Sat, 19 Nov 2011 13:40:57 +0000 > I'm debugging a problem for which kprobes may potentially provide > useful information, in particular I would like to examine local > registers at some point in the kernel code. Unfortunately, while > trying to accomplish that I ran into an issue I can't quite explain: > whenever I try to access %fp register (a.k.a. %i6) from kprobe using > regs->u_regs[UREG_FP], I get an unaligned value, which makes me think > that it's incorrect somehow. On 64-bit sparc, the stack is "biased" by 2047 bytes. This is so that more of the stack frame is reachable relative to %fp using 13-bit signed immediate offsets, which are usable with the address of load and store instructions. Grep for "STACK_BIAS" under arch/sparc -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
