mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-26 04:05:18 +07:00
81fd9c1844
This is preparation for looking at trap number and fault address in the handlers for uaccess errors. No functional change. Signed-off-by: Jann Horn <jannh@google.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Kees Cook <keescook@chromium.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: kernel-hardening@lists.openwall.com Cc: linux-kernel@vger.kernel.org Cc: dvyukov@google.com Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Cc: Borislav Petkov <bp@alien8.de> Link: https://lkml.kernel.org/r/20180828201421.157735-6-jannh@google.com
39 lines
1.3 KiB
C
39 lines
1.3 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)
|
|
|
|
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 bool ex_has_fault_handler(unsigned long ip);
|
|
extern void early_fixup_exception(struct pt_regs *regs, int trapnr);
|
|
|
|
#endif
|