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Message-ID: <20151002101921.GS8645@brightrain.aerifal.cx>
Date: Fri, 2 Oct 2015 06:19:21 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: [PATCH 3/3] Add script to add CFI directives to asm files
in debug builds of x86_64
On Fri, Oct 02, 2015 at 12:02:03PM +0200, Alex Dowad wrote:
> +# this does NOT exhaustively check for all possible instructions which could
> +# overwrite a register value inherited from the caller (just the common ones)
> +/mov.*,%r(ax|bx|cx|dx|si|di|bp|8|9|10|11|12|13|14|15)/ { trashed(get_reg2()) }
> +/(add|addl|sub|subl|and|or|xor|lea|sal|sar|shl|shr) %r(ax|bx|cx|dx|si|di|bp|8|9|10|11|12|13|14|15),/ {
> + trashed(get_reg1())
> +}
This looks wrong but maybe it's already wrong in existing code. Why
are you marking the first operand as trashed rather than the second?
Rich
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