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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
parented8388a5d9db0445322f86ee8381b0f04a2057ee (diff)
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[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')
-rw-r--r--include/asm-x86_64/desc.h5
-rw-r--r--include/asm-x86_64/page.h15
-rw-r--r--include/asm-x86_64/pda.h8
-rw-r--r--include/asm-x86_64/processor.h2
4 files changed, 19 insertions, 11 deletions
diff --git a/include/asm-x86_64/desc.h b/include/asm-x86_64/desc.h
index 3376486..5ce0e34 100644
--- a/include/asm-x86_64/desc.h
+++ b/include/asm-x86_64/desc.h
@@ -114,6 +114,11 @@ static inline void set_system_gate(int nr, void *func)
_set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, 0);
}
+static inline void set_system_gate_ist(int nr, void *func, unsigned ist)
+{
+ _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, ist);
+}
+
static inline void set_tssldt_descriptor(void *ptr, unsigned long tss, unsigned type,
unsigned size)
{
diff --git a/include/asm-x86_64/page.h b/include/asm-x86_64/page.h
index 06e489f..dcbb4fc 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)
diff --git a/include/asm-x86_64/pda.h b/include/asm-x86_64/pda.h
index 8733ccf..431a909 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[];
/*
diff --git a/include/asm-x86_64/processor.h b/include/asm-x86_64/processor.h
index 4861246..5cb1515 100644
--- a/include/asm-x86_64/processor.h
+++ b/include/asm-x86_64/processor.h
@@ -273,8 +273,6 @@ struct thread_struct {
#define DEBUG_STACK 4
#define MCE_STACK 5
#define N_EXCEPTION_STACKS 5 /* hw limit: 7 */
-#define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)
-#define EXCEPTION_STACK_ORDER 0
#define start_thread(regs,new_rip,new_rsp) do { \
asm volatile("movl %0,%%fs; movl %0,%%es; movl %0,%%ds": :"r" (0)); \