From: "Jan Beulich" <JBeulich@suse.com>
To: <mingo@elte.hu>, <tglx@linutronix.de>, <hpa@zytor.com>
Cc: <linux-kernel@vger.kernel.org>
Subject: [PATCH] x86-64/asm: use negative immediates for stack adjustments
Date: Mon, 01 Jun 2015 13:02:55 +0100 [thread overview]
Message-ID: <556C660F020000780007FB60@mail.emea.novell.com> (raw)
Doing so allows adjustments by 128 bytes (occurring for
REMOVE_PT_GPREGS_FROM_STACK 8 uses) to be expressed with a single byte
immediate.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
---
arch/x86/include/asm/calling.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- 4.1-rc6/arch/x86/include/asm/calling.h
+++ 4.1-rc6-x86_64-invert-stack-adjust/arch/x86/include/asm/calling.h
@@ -91,7 +91,7 @@ For 32-bit we have the following convent
#define SIZEOF_PTREGS 21*8
.macro ALLOC_PT_GPREGS_ON_STACK addskip=0
- subq $15*8+\addskip, %rsp
+ addq $-(15*8+\addskip), %rsp
CFI_ADJUST_CFA_OFFSET 15*8+\addskip
.endm
@@ -204,7 +204,7 @@ For 32-bit we have the following convent
.endm
.macro REMOVE_PT_GPREGS_FROM_STACK addskip=0
- addq $15*8+\addskip, %rsp
+ subq $-(15*8+\addskip), %rsp
CFI_ADJUST_CFA_OFFSET -(15*8+\addskip)
.endm
next reply other threads:[~2015-06-01 12:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-01 12:02 Jan Beulich [this message]
2015-06-02 8:24 ` [tip:x86/asm] x86/asm/entry/64: Use " tip-bot for Jan Beulich
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