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 /* 50 * Macros to generate condition code outputs from inline assembly, 51 * The output operand must be type "bool". 52 */ 53 #ifdef __GCC_ASM_FLAG_OUTPUTS__ 54 # define CC_SET(c) "\n\t/* output condition code " #c "*/\n" 55 # define CC_OUT(c) "=@cc" #c 56 #else 57 # define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n" 58 # define CC_OUT(c) [_cc_ ## c] "=qm" 59 #endif 60 61 /* Exception table entry */ 62 #ifdef __ASSEMBLY__ 63 # define _ASM_EXTABLE_HANDLE(from, to, handler) \ 64 .pushsection "__ex_table","a" ; \ 65 .balign 4 ; \ 66 .long (from) - . ; \ 67 .long (to) - . ; \ 68 .long (handler) - . ; \ 69 .popsection 70 71 # define _ASM_EXTABLE(from, to) \ 72 _ASM_EXTABLE_HANDLE(from, to, ex_handler_default) 73 74 # define _ASM_EXTABLE_FAULT(from, to) \ 75 _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault) 76 77 # define _ASM_EXTABLE_EX(from, to) \ 78 _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext) 79 80 # define _ASM_EXTABLE_REFCOUNT(from, to) \ 81 _ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount) 82 83 # define _ASM_NOKPROBE(entry) \ 84 .pushsection "_kprobe_blacklist","aw" ; \ 85 _ASM_ALIGN ; \ 86 _ASM_PTR (entry); \ 87 .popsection 88 89 .macro ALIGN_DESTINATION 90 /* check for bad alignment of destination */ 91 movl %edi,%ecx 92 andl $7,%ecx 93 jz 102f /* already aligned */ 94 subl $8,%ecx 95 negl %ecx 96 subl %ecx,%edx 97 100: movb (%rsi),%al 98 101: movb %al,(%rdi) 99 incq %rsi 100 incq %rdi 101 decl %ecx 102 jnz 100b 103 102: 104 .section .fixup,"ax" 105 103: addl %ecx,%edx /* ecx is zerorest also */ 106 jmp copy_user_handle_tail 107 .previous 108 109 _ASM_EXTABLE(100b,103b) 110 _ASM_EXTABLE(101b,103b) 111 .endm 112 113 #else 114 # define _EXPAND_EXTABLE_HANDLE(x) #x 115 # define _ASM_EXTABLE_HANDLE(from, to, handler) \ 116 " .pushsection \"__ex_table\",\"a\"\n" \ 117 " .balign 4\n" \ 118 " .long (" #from ") - .\n" \ 119 " .long (" #to ") - .\n" \ 120 " .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n" \ 121 " .popsection\n" 122 123 # define _ASM_EXTABLE(from, to) \ 124 _ASM_EXTABLE_HANDLE(from, to, ex_handler_default) 125 126 # define _ASM_EXTABLE_FAULT(from, to) \ 127 _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault) 128 129 # define _ASM_EXTABLE_EX(from, to) \ 130 _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext) 131 132 # define _ASM_EXTABLE_REFCOUNT(from, to) \ 133 _ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount) 134 135 /* For C file, we already have NOKPROBE_SYMBOL macro */ 136 #endif 137 138 #ifndef __ASSEMBLY__ 139 #ifndef __BPF__ 140 /* 141 * This output constraint should be used for any inline asm which has a "call" 142 * instruction. Otherwise the asm may be inserted before the frame pointer 143 * gets set up by the containing function. If you forget to do this, objtool 144 * may print a "call without frame pointer save/setup" warning. 145 */ 146 register unsigned long current_stack_pointer asm(_ASM_SP); 147 #define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer) 148 #endif 149 #endif 150 151 #endif /* _ASM_X86_ASM_H */ 152