1 #ifndef _ASM_X86_ASM_H 2 #define _ASM_X86_ASM_H 3 4 #ifdef __ASSEMBLY__ 5 # define __ASM_FORM(x) x 6 # define __ASM_FORM_RAW(x) x 7 # define __ASM_FORM_COMMA(x) x, 8 #else 9 # define __ASM_FORM(x) " " #x " " 10 # define __ASM_FORM_RAW(x) #x 11 # define __ASM_FORM_COMMA(x) " " #x "," 12 #endif 13 14 #ifndef __x86_64__ 15 /* 32 bit */ 16 # define __ASM_SEL(a,b) __ASM_FORM(a) 17 # define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a) 18 #else 19 /* 64 bit */ 20 # define __ASM_SEL(a,b) __ASM_FORM(b) 21 # define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b) 22 #endif 23 24 #define __ASM_SIZE(inst, ...) __ASM_SEL(inst##l##__VA_ARGS__, \ 25 inst##q##__VA_ARGS__) 26 #define __ASM_REG(reg) __ASM_SEL_RAW(e##reg, r##reg) 27 28 #define _ASM_PTR __ASM_SEL(.long, .quad) 29 #define _ASM_ALIGN __ASM_SEL(.balign 4, .balign 8) 30 31 #define _ASM_MOV __ASM_SIZE(mov) 32 #define _ASM_INC __ASM_SIZE(inc) 33 #define _ASM_DEC __ASM_SIZE(dec) 34 #define _ASM_ADD __ASM_SIZE(add) 35 #define _ASM_SUB __ASM_SIZE(sub) 36 #define _ASM_XADD __ASM_SIZE(xadd) 37 #define _ASM_MUL __ASM_SIZE(mul) 38 39 #define _ASM_AX __ASM_REG(ax) 40 #define _ASM_BX __ASM_REG(bx) 41 #define _ASM_CX __ASM_REG(cx) 42 #define _ASM_DX __ASM_REG(dx) 43 #define _ASM_SP __ASM_REG(sp) 44 #define _ASM_BP __ASM_REG(bp) 45 #define _ASM_SI __ASM_REG(si) 46 #define _ASM_DI __ASM_REG(di) 47 48 /* 49 * Macros to generate condition code outputs from inline assembly, 50 * The output operand must be type "bool". 51 */ 52 #ifdef __GCC_ASM_FLAG_OUTPUTS__ 53 # define CC_SET(c) "\n\t/* output condition code " #c "*/\n" 54 # define CC_OUT(c) "=@cc" #c 55 #else 56 # define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n" 57 # define CC_OUT(c) [_cc_ ## c] "=qm" 58 #endif 59 60 /* Exception table entry */ 61 #ifdef __ASSEMBLY__ 62 # define _ASM_EXTABLE_HANDLE(from, to, handler) \ 63 .pushsection "__ex_table","a" ; \ 64 .balign 4 ; \ 65 .long (from) - . ; \ 66 .long (to) - . ; \ 67 .long (handler) - . ; \ 68 .popsection 69 70 # define _ASM_EXTABLE(from, to) \ 71 _ASM_EXTABLE_HANDLE(from, to, ex_handler_default) 72 73 # define _ASM_EXTABLE_FAULT(from, to) \ 74 _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault) 75 76 # define _ASM_EXTABLE_EX(from, to) \ 77 _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext) 78 79 # define _ASM_EXTABLE_REFCOUNT(from, to) \ 80 _ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount) 81 82 # define _ASM_NOKPROBE(entry) \ 83 .pushsection "_kprobe_blacklist","aw" ; \ 84 _ASM_ALIGN ; \ 85 _ASM_PTR (entry); \ 86 .popsection 87 88 .macro ALIGN_DESTINATION 89 /* check for bad alignment of destination */ 90 movl %edi,%ecx 91 andl $7,%ecx 92 jz 102f /* already aligned */ 93 subl $8,%ecx 94 negl %ecx 95 subl %ecx,%edx 96 100: movb (%rsi),%al 97 101: movb %al,(%rdi) 98 incq %rsi 99 incq %rdi 100 decl %ecx 101 jnz 100b 102 102: 103 .section .fixup,"ax" 104 103: addl %ecx,%edx /* ecx is zerorest also */ 105 jmp copy_user_handle_tail 106 .previous 107 108 _ASM_EXTABLE(100b,103b) 109 _ASM_EXTABLE(101b,103b) 110 .endm 111 112 #else 113 # define _EXPAND_EXTABLE_HANDLE(x) #x 114 # define _ASM_EXTABLE_HANDLE(from, to, handler) \ 115 " .pushsection \"__ex_table\",\"a\"\n" \ 116 " .balign 4\n" \ 117 " .long (" #from ") - .\n" \ 118 " .long (" #to ") - .\n" \ 119 " .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n" \ 120 " .popsection\n" 121 122 # define _ASM_EXTABLE(from, to) \ 123 _ASM_EXTABLE_HANDLE(from, to, ex_handler_default) 124 125 # define _ASM_EXTABLE_FAULT(from, to) \ 126 _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault) 127 128 # define _ASM_EXTABLE_EX(from, to) \ 129 _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext) 130 131 # define _ASM_EXTABLE_REFCOUNT(from, to) \ 132 _ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount) 133 134 /* For C file, we already have NOKPROBE_SYMBOL macro */ 135 #endif 136 137 #ifndef __ASSEMBLY__ 138 /* 139 * This output constraint should be used for any inline asm which has a "call" 140 * instruction. Otherwise the asm may be inserted before the frame pointer 141 * gets set up by the containing function. If you forget to do this, objtool 142 * may print a "call without frame pointer save/setup" warning. 143 */ 144 register unsigned long current_stack_pointer asm(_ASM_SP); 145 #define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer) 146 #endif 147 148 #endif /* _ASM_X86_ASM_H */ 149