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 #ifndef __x86_64__
  15 /* 32 bit */
  16 # define __ASM_SEL(a,b) __ASM_FORM(a)
  17 # define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a)
  18 #else
  19 /* 64 bit */
  20 # define __ASM_SEL(a,b) __ASM_FORM(b)
  21 # define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b)
  22 #endif
  23
  24 #define __ASM_SIZE(inst, ...)   __ASM_SEL(inst##l##__VA_ARGS__, \
  25                                           inst##q##__VA_ARGS__)
  26 #define __ASM_REG(reg)         __ASM_SEL_RAW(e##reg, r##reg)
  27
  28 #define _ASM_PTR        __ASM_SEL(.long, .quad)
  29 #define _ASM_ALIGN      __ASM_SEL(.balign 4, .balign 8)
  30
  31 #define _ASM_MOV        __ASM_SIZE(mov)
  32 #define _ASM_INC        __ASM_SIZE(inc)
  33 #define _ASM_DEC        __ASM_SIZE(dec)
  34 #define _ASM_ADD        __ASM_SIZE(add)
  35 #define _ASM_SUB        __ASM_SIZE(sub)
  36 #define _ASM_XADD       __ASM_SIZE(xadd)
  37 #define _ASM_MUL        __ASM_SIZE(mul)
  38
  39 #define _ASM_AX         __ASM_REG(ax)
  40 #define _ASM_BX         __ASM_REG(bx)
  41 #define _ASM_CX         __ASM_REG(cx)
  42 #define _ASM_DX         __ASM_REG(dx)
  43 #define _ASM_SP         __ASM_REG(sp)
  44 #define _ASM_BP         __ASM_REG(bp)
  45 #define _ASM_SI         __ASM_REG(si)
  46 #define _ASM_DI         __ASM_REG(di)
  47
  48 #ifndef __x86_64__
  49 /* 32 bit */
  50
  51 #define _ASM_ARG1       _ASM_AX
  52 #define _ASM_ARG2       _ASM_DX
  53 #define _ASM_ARG3       _ASM_CX
  54
  55 #define _ASM_ARG1L      eax
  56 #define _ASM_ARG2L      edx
  57 #define _ASM_ARG3L      ecx
  58
  59 #define _ASM_ARG1W      ax
  60 #define _ASM_ARG2W      dx
  61 #define _ASM_ARG3W      cx
  62
  63 #define _ASM_ARG1B      al
  64 #define _ASM_ARG2B      dl
  65 #define _ASM_ARG3B      cl
  66
  67 #else
  68 /* 64 bit */
  69
  70 #define _ASM_ARG1       _ASM_DI
  71 #define _ASM_ARG2       _ASM_SI
  72 #define _ASM_ARG3       _ASM_DX
  73 #define _ASM_ARG4       _ASM_CX
  74 #define _ASM_ARG5       r8
  75 #define _ASM_ARG6       r9
  76
  77 #define _ASM_ARG1Q      rdi
  78 #define _ASM_ARG2Q      rsi
  79 #define _ASM_ARG3Q      rdx
  80 #define _ASM_ARG4Q      rcx
  81 #define _ASM_ARG5Q      r8
  82 #define _ASM_ARG6Q      r9
  83
  84 #define _ASM_ARG1L      edi
  85 #define _ASM_ARG2L      esi
  86 #define _ASM_ARG3L      edx
  87 #define _ASM_ARG4L      ecx
  88 #define _ASM_ARG5L      r8d
  89 #define _ASM_ARG6L      r9d
  90
  91 #define _ASM_ARG1W      di
  92 #define _ASM_ARG2W      si
  93 #define _ASM_ARG3W      dx
  94 #define _ASM_ARG4W      cx
  95 #define _ASM_ARG5W      r8w
  96 #define _ASM_ARG6W      r9w
  97
  98 #define _ASM_ARG1B      dil
  99 #define _ASM_ARG2B      sil
 100 #define _ASM_ARG3B      dl
 101 #define _ASM_ARG4B      cl
 102 #define _ASM_ARG5B      r8b
 103 #define _ASM_ARG6B      r9b
 104
 105 #endif
 106
 107 /* Exception table entry */
 108 #ifdef __ASSEMBLY__
 109 # define _ASM_EXTABLE(from,to)                                  \
 110         .pushsection "__ex_table","a" ;                         \
 111         .balign 8 ;                                             \
 112         .long (from) - . ;                                      \
 113         .long (to) - . ;                                        \
 114         .popsection
 115
 116 # define _ASM_EXTABLE_EX(from,to)                               \
 117         .pushsection "__ex_table","a" ;                         \
 118         .balign 8 ;                                             \
 119         .long (from) - . ;                                      \
 120         .long (to) - . + 0x7ffffff0 ;                           \
 121         .popsection
 122
 123 # define _ASM_NOKPROBE(entry)                                   \
 124         .pushsection "_kprobe_blacklist","aw" ;                 \
 125         _ASM_ALIGN ;                                            \
 126         _ASM_PTR (entry);                                       \
 127         .popsection
 128
 129 .macro ALIGN_DESTINATION
 130         /* check for bad alignment of destination */
 131         movl %edi,%ecx
 132         andl $7,%ecx
 133         jz 102f                         /* already aligned */
 134         subl $8,%ecx
 135         negl %ecx
 136         subl %ecx,%edx
 137 100:    movb (%rsi),%al
 138 101:    movb %al,(%rdi)
 139         incq %rsi
 140         incq %rdi
 141         decl %ecx
 142         jnz 100b
 143 102:
 144         .section .fixup,"ax"
 145 103:    addl %ecx,%edx                  /* ecx is zerorest also */
 146         jmp copy_user_handle_tail
 147         .previous
 148
 149         _ASM_EXTABLE(100b,103b)
 150         _ASM_EXTABLE(101b,103b)
 151         .endm
 152
 153 #else
 154 # define _ASM_EXTABLE(from,to)                                  \
 155         " .pushsection \"__ex_table\",\"a\"\n"                  \
 156         " .balign 8\n"                                          \
 157         " .long (" #from ") - .\n"                              \
 158         " .long (" #to ") - .\n"                                \
 159         " .popsection\n"
 160
 161 # define _ASM_EXTABLE_EX(from,to)                               \
 162         " .pushsection \"__ex_table\",\"a\"\n"                  \
 163         " .balign 8\n"                                          \
 164         " .long (" #from ") - .\n"                              \
 165         " .long (" #to ") - . + 0x7ffffff0\n"                   \
 166         " .popsection\n"
 167 /* For C file, we already have NOKPROBE_SYMBOL macro */
 168 #endif
 169
 170 #ifndef __ASSEMBLY__
 171 /*
 172  * This output constraint should be used for any inline asm which has a "call"
 173  * instruction.  Otherwise the asm may be inserted before the frame pointer
 174  * gets set up by the containing function.  If you forget to do this, objtool
 175  * may print a "call without frame pointer save/setup" warning.
 176  */
 177 register unsigned long current_stack_pointer asm(_ASM_SP);
 178 #define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
 179 #endif
 180
 181 #endif /* _ASM_X86_ASM_H */