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arm64: add extable.h

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-12-25 14:00:03 -05:00
parent d597580d37
commit 46583939b9
2 changed files with 26 additions and 22 deletions
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25
arch/arm64/include/asm/extable.h Normal file
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@ -0,0 +1,25 @@
#ifndef __ASM_EXTABLE_H
#define __ASM_EXTABLE_H
/*
* The exception table consists of pairs of relative offsets: the first
* is the relative offset to an instruction that is allowed to fault,
* and the second is the relative offset at which the program should
* continue. No registers are modified, so it is entirely up to the
* continuation code to figure out what to do.
*
* All the routines below use bits of fixup code that are out of line
* with the main instruction path. This means when everything is well,
* we don't even have to jump over them. Further, they do not intrude
* on our cache or tlb entries.
*/
struct exception_table_entry
{
int insn, fixup;
};
#define ARCH_HAS_RELATIVE_EXTABLE
extern int fixup_exception(struct pt_regs *regs);
#endif

23
arch/arm64/include/asm/uaccess.h
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@ -33,28 +33,7 @@
#include <asm/ptrace.h>
#include <asm/memory.h>
#include <asm/compiler.h>
/*
* The exception table consists of pairs of relative offsets: the first
* is the relative offset to an instruction that is allowed to fault,
* and the second is the relative offset at which the program should
* continue. No registers are modified, so it is entirely up to the
* continuation code to figure out what to do.
*
* All the routines below use bits of fixup code that are out of line
* with the main instruction path. This means when everything is well,
* we don't even have to jump over them. Further, they do not intrude
* on our cache or tlb entries.
*/
struct exception_table_entry
{
int insn, fixup;
};
#define ARCH_HAS_RELATIVE_EXTABLE
extern int fixup_exception(struct pt_regs *regs);
#include <asm/extable.h>
#define KERNEL_DS (-1UL)
#define get_ds() (KERNEL_DS)