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| author | Andi Kleen <ak@suse.de> | 2006-01-16 01:56:39 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-16 11:27:58 -0800 |
| commit | 5f8efbb96f4b2679dcbd2c115380a47bd2089dcd (patch) | |
| tree | 09b8c0684ee8e943d6199e2e4ebc21e5ce0062c9 /arch/x86_64/kernel | |
| parent | aa41eb9915de74fc6935792973bac4bd777ce218 (diff) | |
| download | blackbird-op-linux-5f8efbb96f4b2679dcbd2c115380a47bd2089dcd.tar.gz blackbird-op-linux-5f8efbb96f4b2679dcbd2c115380a47bd2089dcd.zip | |
[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')
| -rw-r--r-- | arch/x86_64/kernel/asm-offsets.c | 5 | ||||
| -rw-r--r-- | arch/x86_64/kernel/entry.S | 12 |
2 files changed, 7 insertions, 10 deletions
diff --git a/arch/x86_64/kernel/asm-offsets.c b/arch/x86_64/kernel/asm-offsets.c index cfb4f9cebea4..38834bbbae11 100644 --- a/arch/x86_64/kernel/asm-offsets.c +++ b/arch/x86_64/kernel/asm-offsets.c @@ -43,6 +43,7 @@ int main(void) ENTRY(irqcount); ENTRY(cpunumber); ENTRY(irqstackptr); + ENTRY(data_offset); BLANK(); #undef ENTRY #ifdef CONFIG_IA32_EMULATION @@ -66,8 +67,6 @@ int main(void) DEFINE(pbe_orig_address, offsetof(struct pbe, orig_address)); DEFINE(pbe_next, offsetof(struct pbe, next)); BLANK(); -#if DEBUG_STKSZ > EXCEPTION_STKSZ - DEFINE(DEBUG_IST, DEBUG_STACK); -#endif + DEFINE(TSS_ist, offsetof(struct tss_struct, ist)); return 0; } diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S index 632fc0f59fcc..dbdba56e8faa 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 |
