LXR linux/arch/x86/include/asm/asm.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_X86_ASM_H
   3#define _ASM_X86_ASM_H
   4
   5#ifdef __ASSEMBLY__
   6# define __ASM_FORM(x, ...)             x,## __VA_ARGS__
   7# define __ASM_FORM_RAW(x, ...)         x,## __VA_ARGS__
   8# define __ASM_FORM_COMMA(x, ...)       x,## __VA_ARGS__,
   9#else
  10#include <linux/stringify.h>
  11# define __ASM_FORM(x, ...)             " " __stringify(x,##__VA_ARGS__) " "
  12# define __ASM_FORM_RAW(x, ...)             __stringify(x,##__VA_ARGS__)
  13# define __ASM_FORM_COMMA(x, ...)       " " __stringify(x,##__VA_ARGS__) ","
  14#endif
  15
  16#define _ASM_BYTES(x, ...)      __ASM_FORM(.byte x,##__VA_ARGS__ ;)
  17
  18#ifndef __x86_64__
  19/* 32 bit */
  20# define __ASM_SEL(a,b)         __ASM_FORM(a)
  21# define __ASM_SEL_RAW(a,b)     __ASM_FORM_RAW(a)
  22#else
  23/* 64 bit */
  24# define __ASM_SEL(a,b)         __ASM_FORM(b)
  25# define __ASM_SEL_RAW(a,b)     __ASM_FORM_RAW(b)
  26#endif
  27
  28#define __ASM_SIZE(inst, ...)   __ASM_SEL(inst##l##__VA_ARGS__, \
  29                                          inst##q##__VA_ARGS__)
  30#define __ASM_REG(reg)         __ASM_SEL_RAW(e##reg, r##reg)
  31
  32#define _ASM_PTR        __ASM_SEL(.long, .quad)
  33#define _ASM_ALIGN      __ASM_SEL(.balign 4, .balign 8)
  34
  35#define _ASM_MOV        __ASM_SIZE(mov)
  36#define _ASM_INC        __ASM_SIZE(inc)
  37#define _ASM_DEC        __ASM_SIZE(dec)
  38#define _ASM_ADD        __ASM_SIZE(add)
  39#define _ASM_SUB        __ASM_SIZE(sub)
  40#define _ASM_XADD       __ASM_SIZE(xadd)
  41#define _ASM_MUL        __ASM_SIZE(mul)
  42
  43#define _ASM_AX         __ASM_REG(ax)
  44#define _ASM_BX         __ASM_REG(bx)
  45#define _ASM_CX         __ASM_REG(cx)
  46#define _ASM_DX         __ASM_REG(dx)
  47#define _ASM_SP         __ASM_REG(sp)
  48#define _ASM_BP         __ASM_REG(bp)
  49#define _ASM_SI         __ASM_REG(si)
  50#define _ASM_DI         __ASM_REG(di)
  51
  52#ifndef __x86_64__
  53/* 32 bit */
  54
  55#define _ASM_ARG1       _ASM_AX
  56#define _ASM_ARG2       _ASM_DX
  57#define _ASM_ARG3       _ASM_CX
  58
  59#define _ASM_ARG1L      eax
  60#define _ASM_ARG2L      edx
  61#define _ASM_ARG3L      ecx
  62
  63#define _ASM_ARG1W      ax
  64#define _ASM_ARG2W      dx
  65#define _ASM_ARG3W      cx
  66
  67#define _ASM_ARG1B      al
  68#define _ASM_ARG2B      dl
  69#define _ASM_ARG3B      cl
  70
  71#else
  72/* 64 bit */
  73
  74#define _ASM_ARG1       _ASM_DI
  75#define _ASM_ARG2       _ASM_SI
  76#define _ASM_ARG3       _ASM_DX
  77#define _ASM_ARG4       _ASM_CX
  78#define _ASM_ARG5       r8
  79#define _ASM_ARG6       r9
  80
  81#define _ASM_ARG1Q      rdi
  82#define _ASM_ARG2Q      rsi
  83#define _ASM_ARG3Q      rdx
  84#define _ASM_ARG4Q      rcx
  85#define _ASM_ARG5Q      r8
  86#define _ASM_ARG6Q      r9
  87
  88#define _ASM_ARG1L      edi
  89#define _ASM_ARG2L      esi
  90#define _ASM_ARG3L      edx
  91#define _ASM_ARG4L      ecx
  92#define _ASM_ARG5L      r8d
  93#define _ASM_ARG6L      r9d
  94
  95#define _ASM_ARG1W      di
  96#define _ASM_ARG2W      si
  97#define _ASM_ARG3W      dx
  98#define _ASM_ARG4W      cx
  99#define _ASM_ARG5W      r8w
 100#define _ASM_ARG6W      r9w
 101
 102#define _ASM_ARG1B      dil
 103#define _ASM_ARG2B      sil
 104#define _ASM_ARG3B      dl
 105#define _ASM_ARG4B      cl
 106#define _ASM_ARG5B      r8b
 107#define _ASM_ARG6B      r9b
 108
 109#endif
 110
 111/*
 112 * Macros to generate condition code outputs from inline assembly,
 113 * The output operand must be type "bool".
 114 */
 115#ifdef __GCC_ASM_FLAG_OUTPUTS__
 116# define CC_SET(c) "\n\t/* output condition code " #c "*/\n"
 117# define CC_OUT(c) "=@cc" #c
 118#else
 119# define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n"
 120# define CC_OUT(c) [_cc_ ## c] "=qm"
 121#endif
 122
 123#ifdef __KERNEL__
 124
 125/* Exception table entry */
 126#ifdef __ASSEMBLY__
 127# define _ASM_EXTABLE_HANDLE(from, to, handler)                 \
 128        .pushsection "__ex_table","a" ;                         \
 129        .balign 4 ;                                             \
 130        .long (from) - . ;                                      \
 131        .long (to) - . ;                                        \
 132        .long (handler) - . ;                                   \
 133        .popsection
 134
 135# define _ASM_EXTABLE(from, to)                                 \
 136        _ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
 137
 138# define _ASM_EXTABLE_UA(from, to)                              \
 139        _ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess)
 140
 141# define _ASM_EXTABLE_CPY(from, to)                             \
 142        _ASM_EXTABLE_HANDLE(from, to, ex_handler_copy)
 143
 144# define _ASM_EXTABLE_FAULT(from, to)                           \
 145        _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
 146
 147# ifdef CONFIG_KPROBES
 148#  define _ASM_NOKPROBE(entry)                                  \
 149        .pushsection "_kprobe_blacklist","aw" ;                 \
 150        _ASM_ALIGN ;                                            \
 151        _ASM_PTR (entry);                                       \
 152        .popsection
 153# else
 154#  define _ASM_NOKPROBE(entry)
 155# endif
 156
 157#else /* ! __ASSEMBLY__ */
 158# define _EXPAND_EXTABLE_HANDLE(x) #x
 159# define _ASM_EXTABLE_HANDLE(from, to, handler)                 \
 160        " .pushsection \"__ex_table\",\"a\"\n"                  \
 161        " .balign 4\n"                                          \
 162        " .long (" #from ") - .\n"                              \
 163        " .long (" #to ") - .\n"                                \
 164        " .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n"    \
 165        " .popsection\n"
 166
 167# define _ASM_EXTABLE(from, to)                                 \
 168        _ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
 169
 170# define _ASM_EXTABLE_UA(from, to)                              \
 171        _ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess)
 172
 173# define _ASM_EXTABLE_CPY(from, to)                             \
 174        _ASM_EXTABLE_HANDLE(from, to, ex_handler_copy)
 175
 176# define _ASM_EXTABLE_FAULT(from, to)                           \
 177        _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
 178
 179/* For C file, we already have NOKPROBE_SYMBOL macro */
 180
 181/*
 182 * This output constraint should be used for any inline asm which has a "call"
 183 * instruction.  Otherwise the asm may be inserted before the frame pointer
 184 * gets set up by the containing function.  If you forget to do this, objtool
 185 * may print a "call without frame pointer save/setup" warning.
 186 */
 187register unsigned long current_stack_pointer asm(_ASM_SP);
 188#define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
 189#endif /* __ASSEMBLY__ */
 190
 191#endif /* __KERNEL__ */
 192
 193#endif /* _ASM_X86_ASM_H */
 194