mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Tony Luck](/assets/img/avatar_default.png)
Avoid a proliferation of ex_has_*_handler() functions by having just one function that returns the type of the handler (if any). Drop the __visible attribute for this function. It is not called from assembler so the attribute is not necessary. Signed-off-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20201006210910.21062-3-tony.luck@intel.com
45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_X86_EXTABLE_H
|
|
#define _ASM_X86_EXTABLE_H
|
|
/*
|
|
* The exception table consists of triples of addresses relative to the
|
|
* exception table entry itself. The first address is of an instruction
|
|
* that is allowed to fault, the second is the target at which the program
|
|
* should continue. The third is a handler function to deal with the fault
|
|
* caused by the instruction in the first field.
|
|
*
|
|
* 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, handler;
|
|
};
|
|
struct pt_regs;
|
|
|
|
#define ARCH_HAS_RELATIVE_EXTABLE
|
|
|
|
#define swap_ex_entry_fixup(a, b, tmp, delta) \
|
|
do { \
|
|
(a)->fixup = (b)->fixup + (delta); \
|
|
(b)->fixup = (tmp).fixup - (delta); \
|
|
(a)->handler = (b)->handler + (delta); \
|
|
(b)->handler = (tmp).handler - (delta); \
|
|
} while (0)
|
|
|
|
enum handler_type {
|
|
EX_HANDLER_NONE,
|
|
EX_HANDLER_FAULT,
|
|
EX_HANDLER_UACCESS,
|
|
EX_HANDLER_OTHER
|
|
};
|
|
|
|
extern int fixup_exception(struct pt_regs *regs, int trapnr,
|
|
unsigned long error_code, unsigned long fault_addr);
|
|
extern int fixup_bug(struct pt_regs *regs, int trapnr);
|
|
extern enum handler_type ex_get_fault_handler_type(unsigned long ip);
|
|
extern void early_fixup_exception(struct pt_regs *regs, int trapnr);
|
|
|
|
#endif
|