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authorAndi Kleen <ak@suse.de>2006-01-16 01:56:39 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-16 11:27:58 -0800
commit5f8efbb96f4b2679dcbd2c115380a47bd2089dcd (patch)
tree09b8c0684ee8e943d6199e2e4ebc21e5ce0062c9 /arch/x86_64/kernel/entry.S
parentaa41eb9915de74fc6935792973bac4bd777ce218 (diff)
[PATCH] x86_64: Allow nesting of int3 by default for kprobes
This unbreaks recursive kprobes which didn't work anymore due to an earlier patch which converted the debug entry point to use an IST. This also allows nesting of the debug entry point too. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64/kernel/entry.S')
-rw-r--r--arch/x86_64/kernel/entry.S12
1 files changed, 5 insertions, 7 deletions
diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S
index 632fc0f59fc..dbdba56e8fa 100644
--- a/arch/x86_64/kernel/entry.S
+++ b/arch/x86_64/kernel/entry.S
@@ -41,6 +41,7 @@
#include <asm/unistd.h>
#include <asm/thread_info.h>
#include <asm/hw_irq.h>
+#include <asm/page.h>
.code64
@@ -674,9 +675,6 @@ ENTRY(spurious_interrupt)
/* error code is on the stack already */
/* handle NMI like exceptions that can happen everywhere */
-#ifndef DEBUG_IST
-# define DEBUG_IST 0
-#endif
.macro paranoidentry sym, ist=0
SAVE_ALL
cld
@@ -695,11 +693,11 @@ ENTRY(spurious_interrupt)
movq ORIG_RAX(%rsp),%rsi
movq $-1,ORIG_RAX(%rsp)
.if \ist
- subq $EXCEPTION_STACK_SIZE, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp)
+ subq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp)
.endif
call \sym
.if \ist
- addq $EXCEPTION_STACK_SIZE, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp)
+ addq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp)
.endif
cli
.endm
@@ -918,7 +916,7 @@ KPROBE_ENTRY(debug)
INTR_FRAME
pushq $0
CFI_ADJUST_CFA_OFFSET 8
- paranoidentry do_debug, DEBUG_IST
+ paranoidentry do_debug, DEBUG_STACK
jmp paranoid_exit
CFI_ENDPROC
.previous .text
@@ -976,7 +974,7 @@ KPROBE_ENTRY(int3)
INTR_FRAME
pushq $0
CFI_ADJUST_CFA_OFFSET 8
- paranoidentry do_int3, DEBUG_IST
+ paranoidentry do_int3, DEBUG_STACK
jmp paranoid_exit
CFI_ENDPROC
.previous .text