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 # define __ASM_FORM(x) " " #x " " 11 # define __ASM_FORM_RAW(x) #x 12 # define __ASM_FORM_COMMA(x) " " #x "," 13 #endif 14 15 #ifndef __x86_64__ 16 /* 32 bit */ 17 # define __ASM_SEL(a,b) __ASM_FORM(a) 18 # define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a) 19 #else 20 /* 64 bit */ 21 # define __ASM_SEL(a,b) __ASM_FORM(b) 22 # define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b) 23 #endif 24 25 #define __ASM_SIZE(inst, ...) __ASM_SEL(inst##l##__VA_ARGS__, \ 26 inst##q##__VA_ARGS__) 27 #define __ASM_REG(reg) __ASM_SEL_RAW(e##reg, r##reg) 28 29 #define _ASM_PTR __ASM_SEL(.long, .quad) 30 #define _ASM_ALIGN __ASM_SEL(.balign 4, .balign 8) 31 32 #define _ASM_MOV __ASM_SIZE(mov) 33 #define _ASM_INC __ASM_SIZE(inc) 34 #define _ASM_DEC __ASM_SIZE(dec) 35 #define _ASM_ADD __ASM_SIZE(add) 36 #define _ASM_SUB __ASM_SIZE(sub) 37 #define _ASM_XADD __ASM_SIZE(xadd) 38 #define _ASM_MUL __ASM_SIZE(mul) 39 40 #define _ASM_AX __ASM_REG(ax) 41 #define _ASM_BX __ASM_REG(bx) 42 #define _ASM_CX __ASM_REG(cx) 43 #define _ASM_DX __ASM_REG(dx) 44 #define _ASM_SP __ASM_REG(sp) 45 #define _ASM_BP __ASM_REG(bp) 46 #define _ASM_SI __ASM_REG(si) 47 #define _ASM_DI __ASM_REG(di) 48 49 #ifndef __x86_64__ 50 /* 32 bit */ 51 52 #define _ASM_ARG1 _ASM_AX 53 #define _ASM_ARG2 _ASM_DX 54 #define _ASM_ARG3 _ASM_CX 55 56 #define _ASM_ARG1L eax 57 #define _ASM_ARG2L edx 58 #define _ASM_ARG3L ecx 59 60 #define _ASM_ARG1W ax 61 #define _ASM_ARG2W dx 62 #define _ASM_ARG3W cx 63 64 #define _ASM_ARG1B al 65 #define _ASM_ARG2B dl 66 #define _ASM_ARG3B cl 67 68 #else 69 /* 64 bit */ 70 71 #define _ASM_ARG1 _ASM_DI 72 #define _ASM_ARG2 _ASM_SI 73 #define _ASM_ARG3 _ASM_DX 74 #define _ASM_ARG4 _ASM_CX 75 #define _ASM_ARG5 r8 76 #define _ASM_ARG6 r9 77 78 #define _ASM_ARG1Q rdi 79 #define _ASM_ARG2Q rsi 80 #define _ASM_ARG3Q rdx 81 #define _ASM_ARG4Q rcx 82 #define _ASM_ARG5Q r8 83 #define _ASM_ARG6Q r9 84 85 #define _ASM_ARG1L edi 86 #define _ASM_ARG2L esi 87 #define _ASM_ARG3L edx 88 #define _ASM_ARG4L ecx 89 #define _ASM_ARG5L r8d 90 #define _ASM_ARG6L r9d 91 92 #define _ASM_ARG1W di 93 #define _ASM_ARG2W si 94 #define _ASM_ARG3W dx 95 #define _ASM_ARG4W cx 96 #define _ASM_ARG5W r8w 97 #define _ASM_ARG6W r9w 98 99 #define _ASM_ARG1B dil 100 #define _ASM_ARG2B sil 101 #define _ASM_ARG3B dl 102 #define _ASM_ARG4B cl 103 #define _ASM_ARG5B r8b 104 #define _ASM_ARG6B r9b 105 106 #endif 107 108 /* 109 * Macros to generate condition code outputs from inline assembly, 110 * The output operand must be type "bool". 111 */ 112 #ifdef __GCC_ASM_FLAG_OUTPUTS__ 113 # define CC_SET(c) "\n\t/* output condition code " #c "*/\n" 114 # define CC_OUT(c) "=@cc" #c 115 #else 116 # define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n" 117 # define CC_OUT(c) [_cc_ ## c] "=qm" 118 #endif 119 120 /* Exception table entry */ 121 #ifdef __ASSEMBLY__ 122 # define _ASM_EXTABLE_HANDLE(from, to, handler) \ 123 .pushsection "__ex_table","a" ; \ 124 .balign 4 ; \ 125 .long (from) - . ; \ 126 .long (to) - . ; \ 127 .long (handler) - . ; \ 128 .popsection 129 130 # define _ASM_EXTABLE(from, to) \ 131 _ASM_EXTABLE_HANDLE(from, to, ex_handler_default) 132 133 # define _ASM_EXTABLE_UA(from, to) \ 134 _ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess) 135 136 # define _ASM_EXTABLE_FAULT(from, to) \ 137 _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault) 138 139 # define _ASM_EXTABLE_EX(from, to) \ 140 _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext) 141 142 # define _ASM_EXTABLE_REFCOUNT(from, to) \ 143 _ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount) 144 145 # define _ASM_NOKPROBE(entry) \ 146 .pushsection "_kprobe_blacklist","aw" ; \ 147 _ASM_ALIGN ; \ 148 _ASM_PTR (entry); \ 149 .popsection 150 151 .macro ALIGN_DESTINATION 152 /* check for bad alignment of destination */ 153 movl %edi,%ecx 154 andl $7,%ecx 155 jz 102f /* already aligned */ 156 subl $8,%ecx 157 negl %ecx 158 subl %ecx,%edx 159 100: movb (%rsi),%al 160 101: movb %al,(%rdi) 161 incq %rsi 162 incq %rdi 163 decl %ecx 164 jnz 100b 165 102: 166 .section .fixup,"ax" 167 103: addl %ecx,%edx /* ecx is zerorest also */ 168 jmp copy_user_handle_tail 169 .previous 170 171 _ASM_EXTABLE_UA(100b, 103b) 172 _ASM_EXTABLE_UA(101b, 103b) 173 .endm 174 175 #else 176 # define _EXPAND_EXTABLE_HANDLE(x) #x 177 # define _ASM_EXTABLE_HANDLE(from, to, handler) \ 178 " .pushsection \"__ex_table\",\"a\"\n" \ 179 " .balign 4\n" \ 180 " .long (" #from ") - .\n" \ 181 " .long (" #to ") - .\n" \ 182 " .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n" \ 183 " .popsection\n" 184 185 # define _ASM_EXTABLE(from, to) \ 186 _ASM_EXTABLE_HANDLE(from, to, ex_handler_default) 187 188 # define _ASM_EXTABLE_UA(from, to) \ 189 _ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess) 190 191 # define _ASM_EXTABLE_FAULT(from, to) \ 192 _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault) 193 194 # define _ASM_EXTABLE_EX(from, to) \ 195 _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext) 196 197 # define _ASM_EXTABLE_REFCOUNT(from, to) \ 198 _ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount) 199 200 /* For C file, we already have NOKPROBE_SYMBOL macro */ 201 #endif 202 203 #ifndef __ASSEMBLY__ 204 /* 205 * This output constraint should be used for any inline asm which has a "call" 206 * instruction. Otherwise the asm may be inserted before the frame pointer 207 * gets set up by the containing function. If you forget to do this, objtool 208 * may print a "call without frame pointer save/setup" warning. 209 */ 210 register unsigned long current_stack_pointer asm(_ASM_SP); 211 #define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer) 212 #endif 213 214 #endif /* _ASM_X86_ASM_H */ 215