Re: x86 inline assembler to stop in debugger

• Subject: Re: x86 inline assembler to stop in debugger
• From: Eric Albert <email@hidden>
• Date: Mon, 30 Jan 2006 06:55:37 -0800
• Delivered-to: email@hidden
• Delivered-to: email@hidden

Thanks, however on PPC, it seems that the inline assembler I found doesn't actually do what I want.  When running under Xcode, it seems to cause an EXC_SOFTWARE, which Xcode seems to treat as fatal.

Is there any way to make my DebugBreak() macro cause Xcode to stop in the debugger as if a breakpoint was set?

Thanks.


On Jan 29, 2006, at 5:23 PM, Eric Albert wrote:

On Jan 29, 2006, at 10:19 AM, Dave McCaldon wrote:

Technical Q&A QA1361 shows how to detect if you are running under the debugger, somewhere I found a snippet of inline assembler that uses this to trap into the debugger (useful for ASSERTs etc).

#define DebugBreak() __asm__ volatile ("twnei %0,0" : : "r" (AmIBeingDebugged()))

Can anyone confirm what the x86 version of this is? I'm guessing something along the lines of:

#define DebugBreak() if (AmIBeingDebugged()) { __asm__ volatile ("int 3"); }

It's more common to use "int3" as the instruction rather than "int $3", but either will work.

Hope this helps,
Eric

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