kernel/arch/x86/include/asm/asm.h

   1 #ifndef _ASM_X86_ASM_H
   2 #define _ASM_X86_ASM_H
   3
   4 #ifdef __ASSEMBLY__
   5 # define __ASM_FORM(x)  x
   6 # define __ASM_FORM_RAW(x)     x
   7 # define __ASM_FORM_COMMA(x) x,
   8 #else
   9 # define __ASM_FORM(x)  " " #x " "
  10 # define __ASM_FORM_RAW(x)     #x
  11 # define __ASM_FORM_COMMA(x) " " #x ","
  12 #endif
  13
  14 #ifdef CONFIG_X86_32
  15 # define __ASM_SEL(a,b) __ASM_FORM(a)
  16 # define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a)
  17 #else
  18 # define __ASM_SEL(a,b) __ASM_FORM(b)
  19 # define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b)
  20 #endif
  21
  22 #define __ASM_SIZE(inst, ...)   __ASM_SEL(inst##l##__VA_ARGS__, \
  23                                           inst##q##__VA_ARGS__)
  24 #define __ASM_REG(reg)         __ASM_SEL_RAW(e##reg, r##reg)
  25
  26 #define _ASM_PTR        __ASM_SEL(.long, .quad)
  27 #define _ASM_ALIGN      __ASM_SEL(.balign 4, .balign 8)
  28
  29 #define _ASM_MOV        __ASM_SIZE(mov)
  30 #define _ASM_INC        __ASM_SIZE(inc)
  31 #define _ASM_DEC        __ASM_SIZE(dec)
  32 #define _ASM_ADD        __ASM_SIZE(add)
  33 #define _ASM_SUB        __ASM_SIZE(sub)
  34 #define _ASM_XADD       __ASM_SIZE(xadd)
  35
  36 #define _ASM_AX         __ASM_REG(ax)
  37 #define _ASM_BX         __ASM_REG(bx)
  38 #define _ASM_CX         __ASM_REG(cx)
  39 #define _ASM_DX         __ASM_REG(dx)
  40 #define _ASM_SP         __ASM_REG(sp)
  41 #define _ASM_BP         __ASM_REG(bp)
  42 #define _ASM_SI         __ASM_REG(si)
  43 #define _ASM_DI         __ASM_REG(di)
  44
  45 /* Exception table entry */
  46 #ifdef __ASSEMBLY__
  47 # define _ASM_EXTABLE(from,to)                                  \
  48         .pushsection "__ex_table","a" ;                         \
  49         .balign 8 ;                                             \
  50         .long (from) - . ;                                      \
  51         .long (to) - . ;                                        \
  52         .popsection
  53
  54 # define _ASM_EXTABLE_EX(from,to)                               \
  55         .pushsection "__ex_table","a" ;                         \
  56         .balign 8 ;                                             \
  57         .long (from) - . ;                                      \
  58         .long (to) - . + 0x7ffffff0 ;                           \
  59         .popsection
  60
  61 # define _ASM_NOKPROBE(entry)                                   \
  62         .pushsection "_kprobe_blacklist","aw" ;                 \
  63         _ASM_ALIGN ;                                            \
  64         _ASM_PTR (entry);                                       \
  65         .popsection
  66
  67 .macro ALIGN_DESTINATION
  68         /* check for bad alignment of destination */
  69         movl %edi,%ecx
  70         andl $7,%ecx
  71         jz 102f                         /* already aligned */
  72         subl $8,%ecx
  73         negl %ecx
  74         subl %ecx,%edx
  75 100:    movb (%rsi),%al
  76 101:    movb %al,(%rdi)
  77         incq %rsi
  78         incq %rdi
  79         decl %ecx
  80         jnz 100b
  81 102:
  82         .section .fixup,"ax"
  83 103:    addl %ecx,%edx                  /* ecx is zerorest also */
  84         jmp copy_user_handle_tail
  85         .previous
  86
  87         _ASM_EXTABLE(100b,103b)
  88         _ASM_EXTABLE(101b,103b)
  89         .endm
  90
  91 #else
  92 # define _ASM_EXTABLE(from,to)                                  \
  93         " .pushsection \"__ex_table\",\"a\"\n"                  \
  94         " .balign 8\n"                                          \
  95         " .long (" #from ") - .\n"                              \
  96         " .long (" #to ") - .\n"                                \
  97         " .popsection\n"
  98
  99 # define _ASM_EXTABLE_EX(from,to)                               \
 100         " .pushsection \"__ex_table\",\"a\"\n"                  \
 101         " .balign 8\n"                                          \
 102         " .long (" #from ") - .\n"                              \
 103         " .long (" #to ") - . + 0x7ffffff0\n"                   \
 104         " .popsection\n"
 105 /* For C file, we already have NOKPROBE_SYMBOL macro */
 106 #endif
 107
 108 #endif /* _ASM_X86_ASM_H */