Messages in this thread Patch in this message | | | From | "H. Peter Anvin" <> | Subject | [PATCH 2/5] x86: Add symbolic constant for exceptions with error code | Date | Wed, 18 Apr 2012 17:16:47 -0700 |
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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
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