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Unwind hints are useful to provide objtool with information about stack states in non-standard functions/code. While the type of information being provided might be very arch specific, the mechanism to provide the information can be useful for other architectures. Move the relevant unwint hint definitions for all architectures to see. [ jpoimboe: REGS_IRET -> REGS_PARTIAL ] Signed-off-by: Julien Thierry <jthierry@redhat.com> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
#ifndef _ASM_X86_UNWIND_HINTS_H
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#define _ASM_X86_UNWIND_HINTS_H
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#include <linux/objtool.h>
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#include "orc_types.h"
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#ifdef __ASSEMBLY__
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.macro UNWIND_HINT_EMPTY
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UNWIND_HINT sp_reg=ORC_REG_UNDEFINED type=UNWIND_HINT_TYPE_CALL end=1
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.endm
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.macro UNWIND_HINT_REGS base=%rsp offset=0 indirect=0 extra=1 partial=0
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.if \base == %rsp
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.if \indirect
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.set sp_reg, ORC_REG_SP_INDIRECT
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.else
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.set sp_reg, ORC_REG_SP
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.endif
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.elseif \base == %rbp
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.set sp_reg, ORC_REG_BP
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.elseif \base == %rdi
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.set sp_reg, ORC_REG_DI
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.elseif \base == %rdx
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.set sp_reg, ORC_REG_DX
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.elseif \base == %r10
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.set sp_reg, ORC_REG_R10
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.else
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.error "UNWIND_HINT_REGS: bad base register"
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.endif
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.set sp_offset, \offset
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.if \partial
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.set type, UNWIND_HINT_TYPE_REGS_PARTIAL
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.elseif \extra == 0
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.set type, UNWIND_HINT_TYPE_REGS_PARTIAL
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.set sp_offset, \offset + (16*8)
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.else
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.set type, UNWIND_HINT_TYPE_REGS
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.endif
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UNWIND_HINT sp_reg=sp_reg sp_offset=sp_offset type=type
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.endm
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.macro UNWIND_HINT_IRET_REGS base=%rsp offset=0
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UNWIND_HINT_REGS base=\base offset=\offset partial=1
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.endm
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.macro UNWIND_HINT_FUNC sp_offset=8
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UNWIND_HINT sp_reg=ORC_REG_SP sp_offset=\sp_offset type=UNWIND_HINT_TYPE_CALL
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.endm
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/*
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* RET_OFFSET: Used on instructions that terminate a function; mostly RETURN
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* and sibling calls. On these, sp_offset denotes the expected offset from
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* initial_func_cfi.
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*/
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.macro UNWIND_HINT_RET_OFFSET sp_offset=8
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UNWIND_HINT sp_reg=ORC_REG_SP type=UNWIND_HINT_TYPE_RET_OFFSET sp_offset=\sp_offset
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.endm
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_X86_UNWIND_HINTS_H */
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