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  */
 187 register 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 */