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From: Segher Boessenkool <>
To: Christophe Leroy <>
Cc: Benjamin Herrenschmidt <>,
	Paul Mackerras <>,
	Michael Ellerman <>,,
Subject: Re: [PATCH] powerpc/booke: Avoid link stack corruption in several places
Date: Mon, 23 Aug 2021 10:58:37 -0500	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Mon, Aug 23, 2021 at 07:53:01AM +0000, Christophe Leroy wrote:
>  /* Be careful, this will clobber the lr register. */
>  #define LOAD_REG_ADDR_PIC(reg, name)		\
> -	bl	0f;				\
> +	bcl	20,31,0f			\
>  0:	mflr	reg;				\
>  	addis	reg,reg,(name - 0b)@ha;		\
>  	addi	reg,reg,(name - 0b)@l;

The code ended each line with a semicolon before, for absolutely no
reason that I can see, but still.  Fixing that would be nice, but only
doing it on one line isn't good.

Btw.  Both the 7450 and the modern cores implementing this really need
this to be $+4, so it is a lot clearer to write that instead of 1f or
a named label.


  reply	other threads:[~2021-08-23 16:04 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-23  7:53 Christophe Leroy
2021-08-23 15:58 ` Segher Boessenkool [this message]
2021-08-23 17:05   ` Christophe Leroy
2021-08-23 20:12     ` Segher Boessenkool

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