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 #define _ASM_MUL        __ASM_SIZE(mul)
  36
  37 #define _ASM_AX         __ASM_REG(ax)
  38 #define _ASM_BX         __ASM_REG(bx)
  39 #define _ASM_CX         __ASM_REG(cx)
  40 #define _ASM_DX         __ASM_REG(dx)
  41 #define _ASM_SP         __ASM_REG(sp)
  42 #define _ASM_BP         __ASM_REG(bp)
  43 #define _ASM_SI         __ASM_REG(si)
  44 #define _ASM_DI         __ASM_REG(di)
  45
  46 /*
  47  * Macros to generate condition code outputs from inline assembly,
  48  * The output operand must be type "bool".
  49  */
  50 #ifdef __GCC_ASM_FLAG_OUTPUTS__
  51 # define CC_SET(c) "\n\t/* output condition code " #c "*/\n"
  52 # define CC_OUT(c) "=@cc" #c
  53 #else
  54 # define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n"
  55 # define CC_OUT(c) [_cc_ ## c] "=qm"
  56 #endif
  57
  58 /* Exception table entry */
  59 #ifdef __ASSEMBLY__
  60 # define _ASM_EXTABLE_HANDLE(from, to, handler)                 \
  61         .pushsection "__ex_table","a" ;                         \
  62         .balign 4 ;                                             \
  63         .long (from) - . ;                                      \
  64         .long (to) - . ;                                        \
  65         .long (handler) - . ;                                   \
  66         .popsection
  67
  68 # define _ASM_EXTABLE(from, to)                                 \
  69         _ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
  70
  71 # define _ASM_EXTABLE_FAULT(from, to)                           \
  72         _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
  73
  74 # define _ASM_EXTABLE_EX(from, to)                              \
  75         _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
  76
  77 # define _ASM_EXTABLE_REFCOUNT(from, to)                        \
  78         _ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount)
  79
  80 # define _ASM_NOKPROBE(entry)                                   \
  81         .pushsection "_kprobe_blacklist","aw" ;                 \
  82         _ASM_ALIGN ;                                            \
  83         _ASM_PTR (entry);                                       \
  84         .popsection
  85
  86 .macro ALIGN_DESTINATION
  87         /* check for bad alignment of destination */
  88         movl %edi,%ecx
  89         andl $7,%ecx
  90         jz 102f                         /* already aligned */
  91         subl $8,%ecx
  92         negl %ecx
  93         subl %ecx,%edx
  94 100:    movb (%rsi),%al
  95 101:    movb %al,(%rdi)
  96         incq %rsi
  97         incq %rdi
  98         decl %ecx
  99         jnz 100b
 100 102:
 101         .section .fixup,"ax"
 102 103:    addl %ecx,%edx                  /* ecx is zerorest also */
 103         jmp copy_user_handle_tail
 104         .previous
 105
 106         _ASM_EXTABLE(100b,103b)
 107         _ASM_EXTABLE(101b,103b)
 108         .endm
 109
 110 #else
 111 # define _EXPAND_EXTABLE_HANDLE(x) #x
 112 # define _ASM_EXTABLE_HANDLE(from, to, handler)                 \
 113         " .pushsection \"__ex_table\",\"a\"\n"                  \
 114         " .balign 4\n"                                          \
 115         " .long (" #from ") - .\n"                              \
 116         " .long (" #to ") - .\n"                                \
 117         " .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n"    \
 118         " .popsection\n"
 119
 120 # define _ASM_EXTABLE(from, to)                                 \
 121         _ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
 122
 123 # define _ASM_EXTABLE_FAULT(from, to)                           \
 124         _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
 125
 126 # define _ASM_EXTABLE_EX(from, to)                              \
 127         _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
 128
 129 # define _ASM_EXTABLE_REFCOUNT(from, to)                        \
 130         _ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount)
 131
 132 /* For C file, we already have NOKPROBE_SYMBOL macro */
 133 #endif
 134
 135 #ifndef __ASSEMBLY__
 136 /*
 137  * This output constraint should be used for any inline asm which has a "call"
 138  * instruction.  Otherwise the asm may be inserted before the frame pointer
 139  * gets set up by the containing function.  If you forget to do this, objtool
 140  * may print a "call without frame pointer save/setup" warning.
 141  */
 142 register unsigned int __asm_call_sp asm("esp");
 143 #define ASM_CALL_CONSTRAINT "+r" (__asm_call_sp)
 144 #endif
 145
 146 #endif /* _ASM_X86_ASM_H */