diff options
| author | Jan Beulich <jbeulich@novell.com> | 2006-01-11 22:43:00 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-11 19:01:13 -0800 |
| commit | b556b35e98ad2b9174a7a623d152cdf412d1a999 (patch) | |
| tree | 10f99d70e719fba811dee85d2f3a82b26d7a4ce8 /include/asm-x86_64/pda.h | |
| parent | ed8388a5d9db0445322f86ee8381b0f04a2057ee (diff) | |
[PATCH] x86_64: Move int 3 handler to debug stack and allow to increase it.
This
- switches the INT3 handler to run on an IST stack (to cope with
breakpoints set by a kernel debugger on places where the kernel's
%gs base hasn't been set up, yet); the IST stack used is shared with
the INT1 handler's
[AK: this also allows setting a kprobe on the interrupt/exception entry
points]
- allows nesting of INT1/INT3 handlers so that one can, with a kernel
debugger, debug (at least) the user-mode portions of the INT1/INT3
handling; the nesting isn't actively enabled here since a kernel-
debugger-free kernel doesn't need it
Signed-Off-By: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64/pda.h')
| -rw-r--r-- | include/asm-x86_64/pda.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/include/asm-x86_64/pda.h b/include/asm-x86_64/pda.h index 8733ccfa442..431a909fbec 100644 --- a/include/asm-x86_64/pda.h +++ b/include/asm-x86_64/pda.h @@ -5,6 +5,7 @@ #include <linux/stddef.h> #include <linux/types.h> #include <linux/cache.h> +#include <asm/page.h> /* Per processor datastructure. %gs points to it while the kernel runs */ struct x8664_pda { @@ -12,6 +13,9 @@ struct x8664_pda { unsigned long data_offset; /* Per cpu data offset from linker address */ unsigned long kernelstack; /* top of kernel stack for current */ unsigned long oldrsp; /* user rsp for system call */ +#if DEBUG_STKSZ > EXCEPTION_STKSZ + unsigned long debugstack; /* #DB/#BP stack. */ +#endif int irqcount; /* Irq nesting counter. Starts with -1 */ int cpunumber; /* Logical CPU number */ char *irqstackptr; /* top of irqstack */ @@ -23,10 +27,6 @@ struct x8664_pda { unsigned apic_timer_irqs; } ____cacheline_aligned_in_smp; - -#define IRQSTACK_ORDER 2 -#define IRQSTACKSIZE (PAGE_SIZE << IRQSTACK_ORDER) - extern struct x8664_pda cpu_pda[]; /* |