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