linux-kernel - [PATCH] x86-64: add unwind annotations to early_idt

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Date:	Thu, 12 Mar 2009 10:36:02 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:	"Andi Kleen" <andi@...stfloor.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86-64: add unwind annotations to early_idt_handler

Signed-off-by: Jan Beulich <jbeulich@...ell.com>
Cc: Andi Kleen <andi@...stfloor.org>

---
 arch/x86/kernel/head_64.S |   13 +++++++++++++
 1 file changed, 13 insertions(+)

--- linux-2.6.29-rc7/arch/x86/kernel/head_64.S	2009-03-11 17:52:10.000000000 +0100
+++ 2.6.29-rc7-x86_64-unwind-early_idt_handler/arch/x86/kernel/head_64.S	2009-02-18 13:38:09.000000000 +0100
@@ -280,6 +280,8 @@ early_idt_handlers:
 
 ENTRY(early_idt_handler)
 #ifdef CONFIG_EARLY_PRINTK
+#include <asm/calling.h>
+#include <asm/dwarf2.h>
 	cmpl $2,early_recursion_flag(%rip)
 	jz  1f
 	incl early_recursion_flag(%rip)
@@ -295,6 +297,16 @@ ENTRY(early_idt_handler)
 	testl $0x27d00,%eax
 	je 0f
 	popq %r8		# get error code
+
+	CFI_STARTPROC	simple
+	CFI_SIGNAL_FRAME
+	CFI_DEF_CFA	rsp, SS+8-RIP
+#	CFI_REL_OFFSET	ss, SS-RIP
+	CFI_REL_OFFSET	rsp, RSP-RIP
+#	CFI_REL_OFFSET	rflags, EFLAGS-RIP
+#	CFI_REL_OFFSET	cs, CS-RIP
+	CFI_REL_OFFSET	rip, RIP-RIP
+
 0:	movq 0(%rsp),%rcx	# get ip
 	movq 8(%rsp),%rdx	# get cs
 	xorl %eax,%eax
@@ -308,6 +320,7 @@ ENTRY(early_idt_handler)
 	movq 0(%rsp),%rsi	# get rip again
 	call __print_symbol
 #endif
+	CFI_ENDPROC
 #endif /* EARLY_PRINTK */
 1:	hlt
 	jmp 1b



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