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 # define __ASM_REGPFX % 10 #else 11 #include <linux/stringify.h> 12 # define __ASM_FORM(x, ...) " " __stringify(x,##__VA_ARGS__) " " 13 # define __ASM_FORM_RAW(x, ...) __stringify(x,##__VA_ARGS__) 14 # define __ASM_FORM_COMMA(x, ...) " " __stringify(x,##__VA_ARGS__) "," 15 # define __ASM_REGPFX %% 16 #endif 17 18 #define _ASM_BYTES(x, ...) __ASM_FORM(.byte x,##__VA_ARGS__ ;) 19 20 #ifndef __x86_64__ 21 /* 32 bit */ 22 # define __ASM_SEL(a,b) __ASM_FORM(a) 23 # define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a) 24 #else 25 /* 64 bit */ 26 # define __ASM_SEL(a,b) __ASM_FORM(b) 27 # define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b) 28 #endif 29 30 #define __ASM_SIZE(inst, ...) __ASM_SEL(inst##l##__VA_ARGS__, \ 31 inst##q##__VA_ARGS__) 32 #define __ASM_REG(reg) __ASM_SEL_RAW(e##reg, r##reg) 33 34 #define _ASM_PTR __ASM_SEL(.long, .quad) 35 #define _ASM_ALIGN __ASM_SEL(.balign 4, .balign 8) 36 37 #define _ASM_MOV __ASM_SIZE(mov) 38 #define _ASM_INC __ASM_SIZE(inc) 39 #define _ASM_DEC __ASM_SIZE(dec) 40 #define _ASM_ADD __ASM_SIZE(add) 41 #define _ASM_SUB __ASM_SIZE(sub) 42 #define _ASM_XADD __ASM_SIZE(xadd) 43 #define _ASM_MUL __ASM_SIZE(mul) 44 45 #define _ASM_AX __ASM_REG(ax) 46 #define _ASM_BX __ASM_REG(bx) 47 #define _ASM_CX __ASM_REG(cx) 48 #define _ASM_DX __ASM_REG(dx) 49 #define _ASM_SP __ASM_REG(sp) 50 #define _ASM_BP __ASM_REG(bp) 51 #define _ASM_SI __ASM_REG(si) 52 #define _ASM_DI __ASM_REG(di) 53 54 /* Adds a (%rip) suffix on 64 bits only; for immediate memory references */ 55 #define _ASM_RIP(x) __ASM_SEL_RAW(x, x (__ASM_REGPFX rip)) 56 57 #ifndef __x86_64__ 58 /* 32 bit */ 59 60 #define _ASM_ARG1 _ASM_AX 61 #define _ASM_ARG2 _ASM_DX 62 #define _ASM_ARG3 _ASM_CX 63 64 #define _ASM_ARG1L eax 65 #define _ASM_ARG2L edx 66 #define _ASM_ARG3L ecx 67 68 #define _ASM_ARG1W ax 69 #define _ASM_ARG2W dx 70 #define _ASM_ARG3W cx 71 72 #define _ASM_ARG1B al 73 #define _ASM_ARG2B dl 74 #define _ASM_ARG3B cl 75 76 #else 77 /* 64 bit */ 78 79 #define _ASM_ARG1 _ASM_DI 80 #define _ASM_ARG2 _ASM_SI 81 #define _ASM_ARG3 _ASM_DX 82 #define _ASM_ARG4 _ASM_CX 83 #define _ASM_ARG5 r8 84 #define _ASM_ARG6 r9 85 86 #define _ASM_ARG1Q rdi 87 #define _ASM_ARG2Q rsi 88 #define _ASM_ARG3Q rdx 89 #define _ASM_ARG4Q rcx 90 #define _ASM_ARG5Q r8 91 #define _ASM_ARG6Q r9 92 93 #define _ASM_ARG1L edi 94 #define _ASM_ARG2L esi 95 #define _ASM_ARG3L edx 96 #define _ASM_ARG4L ecx 97 #define _ASM_ARG5L r8d 98 #define _ASM_ARG6L r9d 99 100 #define _ASM_ARG1W di 101 #define _ASM_ARG2W si 102 #define _ASM_ARG3W dx 103 #define _ASM_ARG4W cx 104 #define _ASM_ARG5W r8w 105 #define _ASM_ARG6W r9w 106 107 #define _ASM_ARG1B dil 108 #define _ASM_ARG2B sil 109 #define _ASM_ARG3B dl 110 #define _ASM_ARG4B cl 111 #define _ASM_ARG5B r8b 112 #define _ASM_ARG6B r9b 113 114 #endif 115 116 #ifndef __ASSEMBLY__ 117 #ifndef __pic__ 118 static __always_inline __pure void *rip_rel_ptr(void *p) 119 { 120 asm("leaq %c1(%%rip), %0" : "=r"(p) : "i"(p)); 121 122 return p; 123 } 124 #define RIP_REL_REF(var) (*(typeof(&(var)))rip_rel_ptr(&(var))) 125 #else 126 #define RIP_REL_REF(var) (var) 127 #endif 128 #endif 129 130 /* 131 * Macros to generate condition code outputs from inline assembly, 132 * The output operand must be type "bool". 133 */ 134 #ifdef __GCC_ASM_FLAG_OUTPUTS__ 135 # define CC_SET(c) "\n\t/* output condition code " #c "*/\n" 136 # define CC_OUT(c) "=@cc" #c 137 #else 138 # define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n" 139 # define CC_OUT(c) [_cc_ ## c] "=qm" 140 #endif 141 142 #ifdef __KERNEL__ 143 144 # include <asm/extable_fixup_types.h> 145 146 /* Exception table entry */ 147 #ifdef __ASSEMBLY__ 148 149 # define _ASM_EXTABLE_TYPE(from, to, type) \ 150 .pushsection "__ex_table","a" ; \ 151 .balign 4 ; \ 152 .long (from) - . ; \ 153 .long (to) - . ; \ 154 .long type ; \ 155 .popsection 156 157 # ifdef CONFIG_KPROBES 158 # define _ASM_NOKPROBE(entry) \ 159 .pushsection "_kprobe_blacklist","aw" ; \ 160 _ASM_ALIGN ; \ 161 _ASM_PTR (entry); \ 162 .popsection 163 # else 164 # define _ASM_NOKPROBE(entry) 165 # endif 166 167 #else /* ! __ASSEMBLY__ */ 168 169 # define DEFINE_EXTABLE_TYPE_REG \ 170 ".macro extable_type_reg type:req reg:req\n" \ 171 ".set .Lfound, 0\n" \ 172 ".set .Lregnr, 0\n" \ 173 ".irp rs,rax,rcx,rdx,rbx,rsp,rbp,rsi,rdi,r8,r9,r10,r11,r12,r13,r14,r15\n" \ 174 ".ifc \\reg, %%\\rs\n" \ 175 ".set .Lfound, .Lfound+1\n" \ 176 ".long \\type + (.Lregnr << 8)\n" \ 177 ".endif\n" \ 178 ".set .Lregnr, .Lregnr+1\n" \ 179 ".endr\n" \ 180 ".set .Lregnr, 0\n" \ 181 ".irp rs,eax,ecx,edx,ebx,esp,ebp,esi,edi,r8d,r9d,r10d,r11d,r12d,r13d,r14d,r15d\n" \ 182 ".ifc \\reg, %%\\rs\n" \ 183 ".set .Lfound, .Lfound+1\n" \ 184 ".long \\type + (.Lregnr << 8)\n" \ 185 ".endif\n" \ 186 ".set .Lregnr, .Lregnr+1\n" \ 187 ".endr\n" \ 188 ".if (.Lfound != 1)\n" \ 189 ".error \"extable_type_reg: bad register argument\"\n" \ 190 ".endif\n" \ 191 ".endm\n" 192 193 # define UNDEFINE_EXTABLE_TYPE_REG \ 194 ".purgem extable_type_reg\n" 195 196 # define _ASM_EXTABLE_TYPE(from, to, type) \ 197 " .pushsection \"__ex_table\",\"a\"\n" \ 198 " .balign 4\n" \ 199 " .long (" #from ") - .\n" \ 200 " .long (" #to ") - .\n" \ 201 " .long " __stringify(type) " \n" \ 202 " .popsection\n" 203 204 # define _ASM_EXTABLE_TYPE_REG(from, to, type, reg) \ 205 " .pushsection \"__ex_table\",\"a\"\n" \ 206 " .balign 4\n" \ 207 " .long (" #from ") - .\n" \ 208 " .long (" #to ") - .\n" \ 209 DEFINE_EXTABLE_TYPE_REG \ 210 "extable_type_reg reg=" __stringify(reg) ", type=" __stringify(type) " \n"\ 211 UNDEFINE_EXTABLE_TYPE_REG \ 212 " .popsection\n" 213 214 /* For C file, we already have NOKPROBE_SYMBOL macro */ 215 216 /* 217 * This output constraint should be used for any inline asm which has a "call" 218 * instruction. Otherwise the asm may be inserted before the frame pointer 219 * gets set up by the containing function. If you forget to do this, objtool 220 * may print a "call without frame pointer save/setup" warning. 221 */ 222 register unsigned long current_stack_pointer asm(_ASM_SP); 223 #define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer) 224 #endif /* __ASSEMBLY__ */ 225 226 #define _ASM_EXTABLE(from, to) \ 227 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_DEFAULT) 228 229 #define _ASM_EXTABLE_UA(from, to) \ 230 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_UACCESS) 231 232 #define _ASM_EXTABLE_CPY(from, to) \ 233 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_COPY) 234 235 #define _ASM_EXTABLE_FAULT(from, to) \ 236 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_FAULT) 237 238 #endif /* __KERNEL__ */ 239 #endif /* _ASM_X86_ASM_H */ 240