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 /*
  49  * Macros to generate condition code outputs from inline assembly,
  50  * The output operand must be type "bool".
  51  */
  52 #ifdef __GCC_ASM_FLAG_OUTPUTS__
  53 # define CC_SET(c) "\n\t/* output condition code " #c "*/\n"
  54 # define CC_OUT(c) "=@cc" #c
  55 #else
  56 # define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n"
  57 # define CC_OUT(c) [_cc_ ## c] "=qm"
  58 #endif
  59
  60 /* Exception table entry */
  61 #ifdef __ASSEMBLY__
  62 # define _ASM_EXTABLE_HANDLE(from, to, handler)                 \
  63         .pushsection "__ex_table","a" ;                         \
  64         .balign 4 ;                                             \
  65         .long (from) - . ;                                      \
  66         .long (to) - . ;                                        \
  67         .long (handler) - . ;                                   \
  68         .popsection
  69
  70 # define _ASM_EXTABLE(from, to)                                 \
  71         _ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
  72
  73 # define _ASM_EXTABLE_FAULT(from, to)                           \
  74         _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
  75
  76 # define _ASM_EXTABLE_EX(from, to)                              \
  77         _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
  78
  79 # define _ASM_EXTABLE_REFCOUNT(from, to)                        \
  80         _ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount)
  81
  82 # define _ASM_NOKPROBE(entry)                                   \
  83         .pushsection "_kprobe_blacklist","aw" ;                 \
  84         _ASM_ALIGN ;                                            \
  85         _ASM_PTR (entry);                                       \
  86         .popsection
  87
  88 .macro ALIGN_DESTINATION
  89         /* check for bad alignment of destination */
  90         movl %edi,%ecx
  91         andl $7,%ecx
  92         jz 102f                         /* already aligned */
  93         subl $8,%ecx
  94         negl %ecx
  95         subl %ecx,%edx
  96 100:    movb (%rsi),%al
  97 101:    movb %al,(%rdi)
  98         incq %rsi
  99         incq %rdi
 100         decl %ecx
 101         jnz 100b
 102 102:
 103         .section .fixup,"ax"
 104 103:    addl %ecx,%edx                  /* ecx is zerorest also */
 105         jmp copy_user_handle_tail
 106         .previous
 107
 108         _ASM_EXTABLE(100b,103b)
 109         _ASM_EXTABLE(101b,103b)
 110         .endm
 111
 112 #else
 113 # define _EXPAND_EXTABLE_HANDLE(x) #x
 114 # define _ASM_EXTABLE_HANDLE(from, to, handler)                 \
 115         " .pushsection \"__ex_table\",\"a\"\n"                  \
 116         " .balign 4\n"                                          \
 117         " .long (" #from ") - .\n"                              \
 118         " .long (" #to ") - .\n"                                \
 119         " .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n"    \
 120         " .popsection\n"
 121
 122 # define _ASM_EXTABLE(from, to)                                 \
 123         _ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
 124
 125 # define _ASM_EXTABLE_FAULT(from, to)                           \
 126         _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
 127
 128 # define _ASM_EXTABLE_EX(from, to)                              \
 129         _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
 130
 131 # define _ASM_EXTABLE_REFCOUNT(from, to)                        \
 132         _ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount)
 133
 134 /* For C file, we already have NOKPROBE_SYMBOL macro */
 135 #endif
 136
 137 #ifndef __ASSEMBLY__
 138 /*
 139  * This output constraint should be used for any inline asm which has a "call"
 140  * instruction.  Otherwise the asm may be inserted before the frame pointer
 141  * gets set up by the containing function.  If you forget to do this, objtool
 142  * may print a "call without frame pointer save/setup" warning.
 143  */
 144 register unsigned long current_stack_pointer asm(_ASM_SP);
 145 #define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
 146 #endif
 147
 148 #endif /* _ASM_X86_ASM_H */