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Message-ID: <20150417055500.GW6817@brightrain.aerifal.cx>
Date: Fri, 17 Apr 2015 01:55:00 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: [PATCH] replace 'hlt' by 'ud2' in i386/x32/x86_64 a_crash
implementations
On Thu, Apr 16, 2015 at 08:58:59PM +0300, Alexander Monakov wrote:
> ---
> ud2 is also what GCC and Clang use to implement __builtin_trap()
>
> ud2 causes SIGILL rather than SIGSEGV; SIGSEGV is more likely to have a custom
> signal handler installed
I've pondered instead using:
push $-1
mov $175,%eax
xor %ebx,%ebx
mov %esp,%ecx
int $128
hlt // or ud2?
This should be uncatchable but it's moderately larger.
Rich
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