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From: "H. Peter Anvin" <hpa@zytor.com>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@amd64.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	"H. Peter Anvin" <hpa@zytor.com>
Subject: [PATCH 2/5] x86: Add symbolic constant for exceptions with error code
Date: Wed, 18 Apr 2012 17:16:47 -0700	[thread overview]
Message-ID: <1334794610-5546-3-git-send-email-hpa@zytor.com> (raw)
In-Reply-To: <1334794610-5546-1-git-send-email-hpa@zytor.com>

From: "H. Peter Anvin" <hpa@zytor.com>

Add a symbolic constant for the bitmask which states which exceptions
carry an error code.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---
 arch/x86/include/asm/segment.h |    2 ++
 arch/x86/kernel/head_64.S      |    2 +-
 2 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/segment.h b/arch/x86/include/asm/segment.h
index 1654662..58c1e6c 100644
--- a/arch/x86/include/asm/segment.h
+++ b/arch/x86/include/asm/segment.h
@@ -205,6 +205,8 @@
 
 #define IDT_ENTRIES 256
 #define NUM_EXCEPTION_VECTORS 32
+/* Bitmask of exception vectors which push an error code on the stack */
+#define EXCEPTION_ERRCODE_MASK  0x00027d00
 #define GDT_SIZE (GDT_ENTRIES * 8)
 #define GDT_ENTRY_TLS_ENTRIES 3
 #define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 40f4eb3..adf52e8 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -295,7 +295,7 @@ ENTRY(early_idt_handler)
 	ja 0f
 	movl $1,%eax
 	salq %cl,%rax
-	testl $0x27d00,%eax
+	testl $EXCEPTION_ERRCODE_MASK,%eax
 	je 0f
 	popq %r8		# get error code
 0:	movq 0(%rsp),%rcx	# get ip
-- 
1.7.6.5


  parent reply	other threads:[~2012-04-19  0:17 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-19  0:16 [PATCH 0/5] RFC: x86: Early exception table support H. Peter Anvin
2012-04-19  0:16 ` [PATCH 1/5] x86, nop: Make the ASM_NOP* macros work from assembly H. Peter Anvin
2012-04-19  9:29   ` Borislav Petkov
2012-04-20  0:24   ` [tip:x86/extable] " tip-bot for H. Peter Anvin
2012-04-19  0:16 ` H. Peter Anvin [this message]
2012-04-19  9:30   ` [PATCH 2/5] x86: Add symbolic constant for exceptions with error code Borislav Petkov
2012-04-20  0:25   ` [tip:x86/extable] " tip-bot for H. Peter Anvin
2012-04-19  0:16 ` [PATCH 3/5] x86, paravirt: Replace GET_CR2_INTO_RCX with GET_CR2_INTO_RAX H. Peter Anvin
2012-04-20  0:26   ` [tip:x86/extable] " tip-bot for H. Peter Anvin
2012-04-19  0:16 ` [PATCH 4/5] x86-64: Handle exception table entries during early boot H. Peter Anvin
2012-04-19 13:02   ` Borislav Petkov
2012-04-19 16:59     ` H. Peter Anvin
2012-04-19 17:16       ` Borislav Petkov
2012-04-20  0:29         ` [tip:x86/extable] x86, doc: Revert "x86: Document rdmsr_safe restrictions" tip-bot for H. Peter Anvin
2012-04-20  0:28   ` [tip:x86/extable] x86-64: Handle exception table entries during early boot tip-bot for H. Peter Anvin
2012-04-19  0:16 ` [PATCH 5/5] x86-32: " H. Peter Anvin
2012-04-20  0:28   ` [tip:x86/extable] " tip-bot for H. Peter Anvin
2012-04-19  9:22 ` [PATCH 0/5] RFC: x86: Early exception table support Borislav Petkov
2012-04-19  9:24   ` [PATCH 1/3] x86, extable: Cleanup fixup_exception Borislav Petkov
2012-04-19  9:25   ` [PATCH 2/3] x86, extable: Carve out the main extable searching routine Borislav Petkov
2012-04-19  9:26   ` [PATCH 3/3] x86, extable: Handle early exceptions Borislav Petkov
2012-04-19 17:02     ` H. Peter Anvin
2012-04-19 17:27       ` Linus Torvalds
2012-04-19 17:38         ` Borislav Petkov
2012-04-19 17:59           ` H. Peter Anvin
2012-04-19 18:25             ` Linus Torvalds
2012-04-19 18:55               ` H. Peter Anvin
2012-04-19 20:17                 ` David Daney
2012-04-19 20:20                   ` H. Peter Anvin
2012-04-19 20:26                     ` H. Peter Anvin
2012-04-19 20:40                       ` David Daney
2012-04-19 21:47                       ` Linus Torvalds
2012-04-19 22:16                   ` H. Peter Anvin
2012-04-19 22:47                     ` Tony Luck
2012-04-19 22:58                       ` Linus Torvalds
2012-04-19 23:10                         ` H. Peter Anvin
2012-04-19 23:26                           ` Tony Luck
2012-04-19 23:35                             ` H. Peter Anvin
2012-04-20  8:26                             ` Andreas Schwab
2012-04-19 18:11           ` Linus Torvalds
2012-04-20  8:46             ` Borislav Petkov
2012-04-19 17:54       ` H. Peter Anvin
2012-04-20  0:27 ` [tip:x86/extable] x86, extable: Add early_fixup_exception() tip-bot for H. Peter Anvin

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