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 */ 194