arch/x86/include/asm/unwind_hints.h

   1 #ifndef _ASM_X86_UNWIND_HINTS_H
   2 #define _ASM_X86_UNWIND_HINTS_H
   3
   4 #include <linux/objtool.h>
   5
   6 #include "orc_types.h"
   7
   8 #ifdef __ASSEMBLY__
   9
  10 .macro UNWIND_HINT_EMPTY
  11         UNWIND_HINT sp_reg=ORC_REG_UNDEFINED type=UNWIND_HINT_TYPE_CALL end=1
  12 .endm
  13
  14 .macro UNWIND_HINT_REGS base=%rsp offset=0 indirect=0 extra=1 partial=0
  15         .if \base == %rsp
  16                 .if \indirect
  17                         .set sp_reg, ORC_REG_SP_INDIRECT
  18                 .else
  19                         .set sp_reg, ORC_REG_SP
  20                 .endif
  21         .elseif \base == %rbp
  22                 .set sp_reg, ORC_REG_BP
  23         .elseif \base == %rdi
  24                 .set sp_reg, ORC_REG_DI
  25         .elseif \base == %rdx
  26                 .set sp_reg, ORC_REG_DX
  27         .elseif \base == %r10
  28                 .set sp_reg, ORC_REG_R10
  29         .else
  30                 .error "UNWIND_HINT_REGS: bad base register"
  31         .endif
  32
  33         .set sp_offset, \offset
  34
  35         .if \partial
  36                 .set type, UNWIND_HINT_TYPE_REGS_PARTIAL
  37         .elseif \extra == 0
  38                 .set type, UNWIND_HINT_TYPE_REGS_PARTIAL
  39                 .set sp_offset, \offset + (16*8)
  40         .else
  41                 .set type, UNWIND_HINT_TYPE_REGS
  42         .endif
  43
  44         UNWIND_HINT sp_reg=sp_reg sp_offset=sp_offset type=type
  45 .endm
  46
  47 .macro UNWIND_HINT_IRET_REGS base=%rsp offset=0
  48         UNWIND_HINT_REGS base=\base offset=\offset partial=1
  49 .endm
  50
  51 .macro UNWIND_HINT_FUNC sp_offset=8
  52         UNWIND_HINT sp_reg=ORC_REG_SP sp_offset=\sp_offset type=UNWIND_HINT_TYPE_CALL
  53 .endm
  54
  55 /*
  56  * RET_OFFSET: Used on instructions that terminate a function; mostly RETURN
  57  * and sibling calls. On these, sp_offset denotes the expected offset from
  58  * initial_func_cfi.
  59  */
  60 .macro UNWIND_HINT_RET_OFFSET sp_offset=8
  61         UNWIND_HINT sp_reg=ORC_REG_SP type=UNWIND_HINT_TYPE_RET_OFFSET sp_offset=\sp_offset
  62 .endm
  63
  64 #endif /* __ASSEMBLY__ */
  65
  66 #endif /* _ASM_X86_UNWIND_HINTS_H */