linux-kernel - Re: [PATCH] kgdbts: unify/generalize gdb breakpoint adjustment

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Date:	Thu, 4 Jun 2009 20:55:40 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	jason.wessel@...driver.com, kgdb-bugreport@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kgdbts: unify/generalize gdb breakpoint adjustment

On Thu, Jun 4, 2009 at 20:50, Andrew Morton wrote:
> On Tue,  2 Jun 2009 03:17:30 -0400
> Mike Frysinger <vapier@...too.org> wrote:
>
>> +     instruction_pointer(&kgdbts_regs) += offset;
>
> instruction_pointer() cannot be used as an lvalue, thankfully.
>
> x86_64:
>
> drivers/misc/kgdbts.c: In function 'check_and_rewind_pc':
> drivers/misc/kgdbts.c:306: error: invalid lvalue in assignment

should be easy to fix:
--- a/arch/x86/include/asm/ptrace.h
+++ b/arch/x86/include/asm/ptrace.h
@@ -236,10 +236,7 @@
 #endif
 }

-static inline unsigned long instruction_pointer(struct pt_regs *regs)
-{
-   return regs->ip;
-}
+#define instruction_pointer(regs) ((regs)->ip)

 static inline unsigned long frame_pointer(struct pt_regs *regs)
 {
-mike
--
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