mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-01 06:33:07 +00:00
b735bd3e68
The ORC metadata generated for UNWIND_HINT_FUNC isn't actually very func-like. With certain usages it can cause stack state mismatches because it doesn't set the return address (CFI_RA). Also, users of UNWIND_HINT_RET_OFFSET no longer need to set a custom return stack offset. Instead they just need to specify a func-like situation, so the current ret_offset code is hacky for no good reason. Solve both problems by simplifying the RET_OFFSET handling and converting it into a more useful UNWIND_HINT_FUNC. If we end up needing the old 'ret_offset' functionality again in the future, we should be able to support it pretty easily with the addition of a custom 'sp_offset' in UNWIND_HINT_FUNC. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Link: https://lore.kernel.org/r/db9d1f5d79dddfbb3725ef6d8ec3477ad199948d.1611263462.git.jpoimboe@redhat.com
57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
#ifndef _ASM_X86_UNWIND_HINTS_H
|
|
#define _ASM_X86_UNWIND_HINTS_H
|
|
|
|
#include <linux/objtool.h>
|
|
|
|
#include "orc_types.h"
|
|
|
|
#ifdef __ASSEMBLY__
|
|
|
|
.macro UNWIND_HINT_EMPTY
|
|
UNWIND_HINT sp_reg=ORC_REG_UNDEFINED type=UNWIND_HINT_TYPE_CALL end=1
|
|
.endm
|
|
|
|
.macro UNWIND_HINT_REGS base=%rsp offset=0 indirect=0 extra=1 partial=0
|
|
.if \base == %rsp
|
|
.if \indirect
|
|
.set sp_reg, ORC_REG_SP_INDIRECT
|
|
.else
|
|
.set sp_reg, ORC_REG_SP
|
|
.endif
|
|
.elseif \base == %rbp
|
|
.set sp_reg, ORC_REG_BP
|
|
.elseif \base == %rdi
|
|
.set sp_reg, ORC_REG_DI
|
|
.elseif \base == %rdx
|
|
.set sp_reg, ORC_REG_DX
|
|
.elseif \base == %r10
|
|
.set sp_reg, ORC_REG_R10
|
|
.else
|
|
.error "UNWIND_HINT_REGS: bad base register"
|
|
.endif
|
|
|
|
.set sp_offset, \offset
|
|
|
|
.if \partial
|
|
.set type, UNWIND_HINT_TYPE_REGS_PARTIAL
|
|
.elseif \extra == 0
|
|
.set type, UNWIND_HINT_TYPE_REGS_PARTIAL
|
|
.set sp_offset, \offset + (16*8)
|
|
.else
|
|
.set type, UNWIND_HINT_TYPE_REGS
|
|
.endif
|
|
|
|
UNWIND_HINT sp_reg=sp_reg sp_offset=sp_offset type=type
|
|
.endm
|
|
|
|
.macro UNWIND_HINT_IRET_REGS base=%rsp offset=0
|
|
UNWIND_HINT_REGS base=\base offset=\offset partial=1
|
|
.endm
|
|
|
|
.macro UNWIND_HINT_FUNC
|
|
UNWIND_HINT sp_reg=ORC_REG_SP sp_offset=8 type=UNWIND_HINT_TYPE_FUNC
|
|
.endm
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#endif /* _ASM_X86_UNWIND_HINTS_H */
|