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 ASM_EXTABLE_HANDLE from to handler 124 125 .macro ASM_EXTABLE_HANDLE from:req to:req handler:req 126 .pushsection "__ex_table","a" 127 .balign 4 128 .long (\from) - . 129 .long (\to) - . 130 .long (\handler) - . 131 .popsection 132 .endm 133 #else /* __ASSEMBLY__ */ 134 135 # define _ASM_EXTABLE_HANDLE(from, to, handler) \ 136 "ASM_EXTABLE_HANDLE from=" #from " to=" #to \ 137 " handler=\"" #handler "\"\n\t" 138 139 /* For C file, we already have NOKPROBE_SYMBOL macro */ 140 141 #endif /* __ASSEMBLY__ */ 142 143 # define _ASM_EXTABLE(from, to) \ 144 _ASM_EXTABLE_HANDLE(from, to, ex_handler_default) 145 146 # define _ASM_EXTABLE_UA(from, to) \ 147 _ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess) 148 149 # define _ASM_EXTABLE_FAULT(from, to) \ 150 _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault) 151 152 # define _ASM_EXTABLE_EX(from, to) \ 153 _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext) 154 155 # define _ASM_EXTABLE_REFCOUNT(from, to) \ 156 _ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount) 157 158 # define _ASM_NOKPROBE(entry) \ 159 .pushsection "_kprobe_blacklist","aw" ; \ 160 _ASM_ALIGN ; \ 161 _ASM_PTR (entry); \ 162 .popsection 163 164 #ifdef __ASSEMBLY__ 165 .macro ALIGN_DESTINATION 166 /* check for bad alignment of destination */ 167 movl %edi,%ecx 168 andl $7,%ecx 169 jz 102f /* already aligned */ 170 subl $8,%ecx 171 negl %ecx 172 subl %ecx,%edx 173 100: movb (%rsi),%al 174 101: movb %al,(%rdi) 175 incq %rsi 176 incq %rdi 177 decl %ecx 178 jnz 100b 179 102: 180 .section .fixup,"ax" 181 103: addl %ecx,%edx /* ecx is zerorest also */ 182 jmp copy_user_handle_tail 183 .previous 184 185 _ASM_EXTABLE_UA(100b, 103b) 186 _ASM_EXTABLE_UA(101b, 103b) 187 .endm 188 #endif /* __ASSEMBLY__ */ 189 190 #ifndef __ASSEMBLY__ 191 /* 192 * This output constraint should be used for any inline asm which has a "call" 193 * instruction. Otherwise the asm may be inserted before the frame pointer 194 * gets set up by the containing function. If you forget to do this, objtool 195 * may print a "call without frame pointer save/setup" warning. 196 */ 197 register unsigned long current_stack_pointer asm(_ASM_SP); 198 #define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer) 199 #endif 200 201 #endif /* _ASM_X86_ASM_H */ 202