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authorJan Beulich <jbeulich@novell.com>2006-01-11 22:43:00 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-11 19:01:13 -0800
commitb556b35e98ad2b9174a7a623d152cdf412d1a999 (patch)
tree10f99d70e719fba811dee85d2f3a82b26d7a4ce8 /include/asm-x86_64/page.h
parented8388a5d9db0445322f86ee8381b0f04a2057ee (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/page.h')
-rw-r--r--include/asm-x86_64/page.h15
1 files changed, 10 insertions, 5 deletions
diff --git a/include/asm-x86_64/page.h b/include/asm-x86_64/page.h
index 06e489f3247..dcbb4fcd9a1 100644
--- a/include/asm-x86_64/page.h
+++ b/include/asm-x86_64/page.h
@@ -14,13 +14,18 @@
#define PHYSICAL_PAGE_MASK (~(PAGE_SIZE-1) & __PHYSICAL_MASK)
#define THREAD_ORDER 1
-#ifdef __ASSEMBLY__
-#define THREAD_SIZE (1 << (PAGE_SHIFT + THREAD_ORDER))
-#else
-#define THREAD_SIZE (1UL << (PAGE_SHIFT + THREAD_ORDER))
-#endif
+#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
#define CURRENT_MASK (~(THREAD_SIZE-1))
+#define EXCEPTION_STACK_ORDER 0
+#define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)
+
+#define DEBUG_STACK_ORDER EXCEPTION_STACK_ORDER
+#define DEBUG_STKSZ (PAGE_SIZE << DEBUG_STACK_ORDER)
+
+#define IRQSTACK_ORDER 2
+#define IRQSTACKSIZE (PAGE_SIZE << IRQSTACK_ORDER)
+
#define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
#define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)