From: Peter Zijlstra <peterz@infradead.org>
To: Sathvika Vasireddy <sv@linux.ibm.com>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>,
christophe.leroy@csgroup.eu, npiggin@gmail.com,
maddy@linux.ibm.com, linux-kernel@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, llvm@lists.linux.dev
Subject: Re: [RFC PATCH] objtool: Skip unannotated intra-function call warning for bl+mflr pattern
Date: Mon, 24 Feb 2025 13:35:34 +0100 [thread overview]
Message-ID: <20250224123534.GB17456@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <4bea75bc-d3f6-4972-b644-f9b5a4e8bb77@linux.ibm.com>
On Fri, Feb 21, 2025 at 02:20:41PM +0530, Sathvika Vasireddy wrote:
> Also, just out of curiosity, how does x86 do it? Does it not use a branch to
> next instruction approach?
x86_64 can use LEA like:
#define _THIS_IP_ ({ unsigned long __here; asm ("lea 0(%%rip), %0" : "=r" (__here)); __here; })
32bit needs to call a function, read the stack value and return.
next prev parent reply other threads:[~2025-02-24 12:35 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-19 16:20 [RFC PATCH] objtool: Skip unannotated intra-function call warning for bl+mflr pattern Sathvika Vasireddy
2025-02-20 19:59 ` Josh Poimboeuf
2025-02-21 8:50 ` Sathvika Vasireddy
2025-02-24 10:36 ` Christophe Leroy
2025-02-24 12:35 ` Peter Zijlstra [this message]
2025-02-24 16:25 ` Peter Zijlstra
2025-02-24 17:54 ` Christophe Leroy
2025-02-24 7:15 ` Christophe Leroy
2025-02-24 10:33 ` Christophe Leroy
2025-02-24 13:19 ` Christophe Leroy
2025-02-24 17:09 ` Nathan Chancellor
2025-02-25 7:35 ` Christophe Leroy
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