Commit 6d48583b authored by Harvey Harrison's avatar Harvey Harrison Committed by Ingo Molnar

x86: unify extable_{32|64}.c

Introduce fixup_exception() on 64-bit and use it in kprobes to
eliminate an #ifdef.

Only 64-bit needs search_extable() due to a stepping bug.
Signed-off-by: default avatarHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 46265df0
......@@ -904,19 +904,9 @@ int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
* In case the user-specified fault handler returned
* zero, try to fix up.
*/
#ifdef CONFIG_X86_64
{
const struct exception_table_entry *fixup;
fixup = search_exception_tables(regs->ip);
if (fixup) {
regs->ip = fixup->fixup;
return 1;
}
}
#else
if (fixup_exception(regs))
return 1;
#endif
/*
* fixup routine could not handle it,
* Let do_page_fault() fix it.
......
......@@ -2,7 +2,7 @@
# Makefile for the linux i386-specific parts of the memory manager.
#
obj-y := init_32.o pgtable_32.o fault_32.o ioremap_32.o extable_32.o pageattr_32.o mmap.o
obj-y := init_32.o pgtable_32.o fault_32.o ioremap_32.o extable.o pageattr_32.o mmap.o
obj-$(CONFIG_NUMA) += discontig_32.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
......
......@@ -2,7 +2,7 @@
# Makefile for the linux x86_64-specific parts of the memory manager.
#
obj-y := init_64.o fault_64.o ioremap_64.o extable_64.o pageattr_64.o mmap.o
obj-y := init_64.o fault_64.o ioremap_64.o extable.o pageattr_64.o mmap.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
obj-$(CONFIG_NUMA) += numa_64.o
obj-$(CONFIG_K8_NUMA) += k8topology_64.o
......
/*
* linux/arch/i386/mm/extable.c
*/
#include <linux/module.h>
#include <linux/spinlock.h>
#include <asm/uaccess.h>
int fixup_exception(struct pt_regs *regs)
{
const struct exception_table_entry *fixup;
#ifdef CONFIG_PNPBIOS
if (unlikely(SEGMENT_IS_PNP_CODE(regs->cs)))
{
if (unlikely(SEGMENT_IS_PNP_CODE(regs->cs))) {
extern u32 pnp_bios_fault_eip, pnp_bios_fault_esp;
extern u32 pnp_bios_is_utter_crap;
pnp_bios_is_utter_crap = 1;
......@@ -33,3 +29,34 @@ int fixup_exception(struct pt_regs *regs)
return 0;
}
#ifdef CONFIG_X86_64
/*
* Need to defined our own search_extable on X86_64 to work around
* a B stepping K8 bug.
*/
const struct exception_table_entry *
search_extable(const struct exception_table_entry *first,
const struct exception_table_entry *last,
unsigned long value)
{
/* B stepping K8 bug */
if ((value >> 32) == 0)
value |= 0xffffffffUL << 32;
while (first <= last) {
const struct exception_table_entry *mid;
long diff;
mid = (last - first) / 2 + first;
diff = mid->insn - value;
if (diff == 0)
return mid;
else if (diff < 0)
first = mid+1;
else
last = mid-1;
}
return NULL;
}
#endif
/*
* linux/arch/x86_64/mm/extable.c
*/
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <asm/uaccess.h>
/* Simple binary search */
const struct exception_table_entry *
search_extable(const struct exception_table_entry *first,
const struct exception_table_entry *last,
unsigned long value)
{
/* Work around a B stepping K8 bug */
if ((value >> 32) == 0)
value |= 0xffffffffUL << 32;
while (first <= last) {
const struct exception_table_entry *mid;
long diff;
mid = (last - first) / 2 + first;
diff = mid->insn - value;
if (diff == 0)
return mid;
else if (diff < 0)
first = mid+1;
else
last = mid-1;
}
return NULL;
}
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