From: "Paweł Sikora" <pluto@pld-linux.org>
To: linux-kernel@vger.kernel.org
Subject: [PATCH] [i386] current_stack_pointer()
Date: Thu, 14 Oct 2004 07:24:43 +0200 [thread overview]
Message-ID: <200410140724.44408.pluto@pld-linux.org> (raw)
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Hi,
This trivial fix simplifies the output code.
testcase).
volatile unsigned long tmp = current_stack_pointer
without fix).
#APP
movl %esp, %eax # ti
#NO_APP
movl %eax, tmp # ti, tmp
with fix).
movl %esp, tmp # __esp, tmp
--
/* Copyright (C) 2003, SCO, Inc. This is valuable Intellectual Property. */
#define say(x) lie(x)
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[-- Type: text/x-diff, Size: 1581 bytes --]
diff -uNr linux-2.6.9-rc4.orig/arch/i386/kernel/irq.c linux-2.6.9-rc4/arch/i386/kernel/irq.c
--- linux-2.6.9-rc4.orig/arch/i386/kernel/irq.c 2004-10-11 04:57:02.000000000 +0200
+++ linux-2.6.9-rc4/arch/i386/kernel/irq.c 2004-10-12 18:35:56.734235704 +0200
@@ -515,7 +515,7 @@
/* build the stack frame on the IRQ stack */
isp = (u32*) ((char*)irqctx + sizeof(*irqctx));
irqctx->tinfo.task = curctx->tinfo.task;
- irqctx->tinfo.previous_esp = current_stack_pointer();
+ irqctx->tinfo.previous_esp = current_stack_pointer;
*--isp = (u32) action;
*--isp = (u32) ®s;
@@ -1135,7 +1135,7 @@
curctx = current_thread_info();
irqctx = softirq_ctx[smp_processor_id()];
irqctx->tinfo.task = curctx->task;
- irqctx->tinfo.previous_esp = current_stack_pointer();
+ irqctx->tinfo.previous_esp = current_stack_pointer;
/* build the stack frame on the softirq stack */
isp = (u32*) ((char*)irqctx + sizeof(*irqctx));
diff -uNr linux-2.6.9-rc4.orig/include/asm-i386/thread_info.h linux-2.6.9-rc4/include/asm-i386/thread_info.h
--- linux-2.6.9-rc4.orig/include/asm-i386/thread_info.h 2004-10-11 04:57:04.000000000 +0200
+++ linux-2.6.9-rc4/include/asm-i386/thread_info.h 2004-10-12 18:35:41.420563736 +0200
@@ -92,12 +92,7 @@
}
/* how to get the current stack pointer from C */
-static inline unsigned long current_stack_pointer(void)
-{
- unsigned long ti;
- __asm__("movl %%esp,%0; ":"=r" (ti) : );
- return ti;
-}
+register unsigned long current_stack_pointer asm ("esp");
/* thread information allocation */
#ifdef CONFIG_DEBUG_STACK_USAGE
reply other threads:[~2004-10-14 5:24 UTC|newest]
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