1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_ASM_H 3 #define _ASM_X86_ASM_H 4 5 #include <linux/annotate.h> 6 7 #ifdef __ASSEMBLER__ 8 # define __ASM_FORM(x, ...) x,## __VA_ARGS__ 9 # define __ASM_FORM_RAW(x, ...) x,## __VA_ARGS__ 10 # define __ASM_FORM_COMMA(x, ...) x,## __VA_ARGS__, 11 # define __ASM_REGPFX % 12 #else 13 #include <linux/stringify.h> 14 # define __ASM_FORM(x, ...) " " __stringify(x,##__VA_ARGS__) " " 15 # define __ASM_FORM_RAW(x, ...) __stringify(x,##__VA_ARGS__) 16 # define __ASM_FORM_COMMA(x, ...) " " __stringify(x,##__VA_ARGS__) "," 17 # define __ASM_REGPFX %% 18 #endif 19 20 #define _ASM_BYTES(x, ...) __ASM_FORM(.byte x,##__VA_ARGS__ ;) 21 22 #ifndef __x86_64__ 23 /* 32 bit */ 24 # define __ASM_SEL(a,b) __ASM_FORM(a) 25 # define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a) 26 #else 27 /* 64 bit */ 28 # define __ASM_SEL(a,b) __ASM_FORM(b) 29 # define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b) 30 #endif 31 32 #define __ASM_SIZE(inst, ...) __ASM_SEL(inst##l##__VA_ARGS__, \ 33 inst##q##__VA_ARGS__) 34 #define __ASM_REG(reg) __ASM_SEL_RAW(e##reg, r##reg) 35 36 #define _ASM_PTR __ASM_SEL(.long, .quad) 37 #define _ASM_ALIGN __ASM_SEL(.balign 4, .balign 8) 38 39 #define _ASM_MOV __ASM_SIZE(mov) 40 #define _ASM_INC __ASM_SIZE(inc) 41 #define _ASM_DEC __ASM_SIZE(dec) 42 #define _ASM_ADD __ASM_SIZE(add) 43 #define _ASM_SUB __ASM_SIZE(sub) 44 #define _ASM_XADD __ASM_SIZE(xadd) 45 #define _ASM_MUL __ASM_SIZE(mul) 46 47 #define _ASM_AX __ASM_REG(ax) 48 #define _ASM_BX __ASM_REG(bx) 49 #define _ASM_CX __ASM_REG(cx) 50 #define _ASM_DX __ASM_REG(dx) 51 #define _ASM_SP __ASM_REG(sp) 52 #define _ASM_BP __ASM_REG(bp) 53 #define _ASM_SI __ASM_REG(si) 54 #define _ASM_DI __ASM_REG(di) 55 56 /* Adds a (%rip) suffix on 64 bits only; for immediate memory references */ 57 #define _ASM_RIP(x) __ASM_SEL_RAW(x, x (__ASM_REGPFX rip)) 58 59 #ifndef __x86_64__ 60 /* 32 bit */ 61 62 #define _ASM_ARG1 _ASM_AX 63 #define _ASM_ARG2 _ASM_DX 64 #define _ASM_ARG3 _ASM_CX 65 66 #define _ASM_ARG1L eax 67 #define _ASM_ARG2L edx 68 #define _ASM_ARG3L ecx 69 70 #define _ASM_ARG1W ax 71 #define _ASM_ARG2W dx 72 #define _ASM_ARG3W cx 73 74 #define _ASM_ARG1B al 75 #define _ASM_ARG2B dl 76 #define _ASM_ARG3B cl 77 78 #else 79 /* 64 bit */ 80 81 #define _ASM_ARG1 _ASM_DI 82 #define _ASM_ARG2 _ASM_SI 83 #define _ASM_ARG3 _ASM_DX 84 #define _ASM_ARG4 _ASM_CX 85 #define _ASM_ARG5 r8 86 #define _ASM_ARG6 r9 87 88 #define _ASM_ARG1Q rdi 89 #define _ASM_ARG2Q rsi 90 #define _ASM_ARG3Q rdx 91 #define _ASM_ARG4Q rcx 92 #define _ASM_ARG5Q r8 93 #define _ASM_ARG6Q r9 94 95 #define _ASM_ARG1L edi 96 #define _ASM_ARG2L esi 97 #define _ASM_ARG3L edx 98 #define _ASM_ARG4L ecx 99 #define _ASM_ARG5L r8d 100 #define _ASM_ARG6L r9d 101 102 #define _ASM_ARG1W di 103 #define _ASM_ARG2W si 104 #define _ASM_ARG3W dx 105 #define _ASM_ARG4W cx 106 #define _ASM_ARG5W r8w 107 #define _ASM_ARG6W r9w 108 109 #define _ASM_ARG1B dil 110 #define _ASM_ARG2B sil 111 #define _ASM_ARG3B dl 112 #define _ASM_ARG4B cl 113 #define _ASM_ARG5B r8b 114 #define _ASM_ARG6B r9b 115 116 #endif 117 118 #ifndef __ASSEMBLER__ 119 static __always_inline __pure void *rip_rel_ptr(void *p) 120 { 121 asm("leaq %c1(%%rip), %0" : "=r"(p) : "i"(p)); 122 123 return p; 124 } 125 #endif 126 127 #ifdef __KERNEL__ 128 129 # include <asm/extable_fixup_types.h> 130 131 /* Exception table entry */ 132 #ifdef __ASSEMBLER__ 133 134 # define _ASM_EXTABLE_TYPE(from, to, type) \ 135 .pushsection "__ex_table","a" ; \ 136 .balign 4 ; \ 137 ANNOTATE_DATA_SPECIAL ; \ 138 .long (from) - . ; \ 139 .long (to) - . ; \ 140 .long type ; \ 141 .popsection 142 143 # ifdef CONFIG_KPROBES 144 # define _ASM_NOKPROBE(entry) \ 145 .pushsection "_kprobe_blacklist","aw" ; \ 146 _ASM_ALIGN ; \ 147 _ASM_PTR (entry); \ 148 .popsection 149 # else 150 # define _ASM_NOKPROBE(entry) 151 # endif 152 153 #else /* ! __ASSEMBLER__ */ 154 155 # define DEFINE_EXTABLE_TYPE_REG \ 156 ".macro extable_type_reg type:req reg:req\n" \ 157 ".set .Lfound, 0\n" \ 158 ".set .Lregnr, 0\n" \ 159 ".irp rs,rax,rcx,rdx,rbx,rsp,rbp,rsi,rdi,r8,r9,r10,r11,r12,r13,r14,r15\n" \ 160 ".ifc \\reg, %%\\rs\n" \ 161 ".set .Lfound, .Lfound+1\n" \ 162 ".long \\type + (.Lregnr << 8)\n" \ 163 ".endif\n" \ 164 ".set .Lregnr, .Lregnr+1\n" \ 165 ".endr\n" \ 166 ".set .Lregnr, 0\n" \ 167 ".irp rs,eax,ecx,edx,ebx,esp,ebp,esi,edi,r8d,r9d,r10d,r11d,r12d,r13d,r14d,r15d\n" \ 168 ".ifc \\reg, %%\\rs\n" \ 169 ".set .Lfound, .Lfound+1\n" \ 170 ".long \\type + (.Lregnr << 8)\n" \ 171 ".endif\n" \ 172 ".set .Lregnr, .Lregnr+1\n" \ 173 ".endr\n" \ 174 ".if (.Lfound != 1)\n" \ 175 ".error \"extable_type_reg: bad register argument\"\n" \ 176 ".endif\n" \ 177 ".endm\n" 178 179 # define UNDEFINE_EXTABLE_TYPE_REG \ 180 ".purgem extable_type_reg\n" 181 182 # define _ASM_EXTABLE_TYPE(from, to, type) \ 183 " .pushsection \"__ex_table\",\"a\"\n" \ 184 " .balign 4\n" \ 185 ANNOTATE_DATA_SPECIAL \ 186 " .long (" #from ") - .\n" \ 187 " .long (" #to ") - .\n" \ 188 " .long " __stringify(type) " \n" \ 189 " .popsection\n" 190 191 # define _ASM_EXTABLE_TYPE_REG(from, to, type, reg) \ 192 " .pushsection \"__ex_table\",\"a\"\n" \ 193 " .balign 4\n" \ 194 ANNOTATE_DATA_SPECIAL \ 195 " .long (" #from ") - .\n" \ 196 " .long (" #to ") - .\n" \ 197 DEFINE_EXTABLE_TYPE_REG \ 198 "extable_type_reg reg=" __stringify(reg) ", type=" __stringify(type) " \n"\ 199 UNDEFINE_EXTABLE_TYPE_REG \ 200 " .popsection\n" 201 202 /* For C file, we already have NOKPROBE_SYMBOL macro */ 203 204 /* Insert a comma if args are non-empty */ 205 #define COMMA(x...) __COMMA(x) 206 #define __COMMA(...) , ##__VA_ARGS__ 207 208 /* 209 * Combine multiple asm inline constraint args into a single arg for passing to 210 * another macro. 211 */ 212 #define ASM_OUTPUT(x...) x 213 #define ASM_INPUT(x...) x 214 215 /* 216 * This output constraint should be used for any inline asm which has a "call" 217 * instruction. Otherwise the asm may be inserted before the frame pointer 218 * gets set up by the containing function. If you forget to do this, objtool 219 * may print a "call without frame pointer save/setup" warning. 220 */ 221 register unsigned long current_stack_pointer asm(_ASM_SP); 222 #define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer) 223 #endif /* __ASSEMBLER__ */ 224 225 #define _ASM_EXTABLE(from, to) \ 226 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_DEFAULT) 227 228 #define _ASM_EXTABLE_UA(from, to) \ 229 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_UACCESS) 230 231 #define _ASM_EXTABLE_FAULT(from, to) \ 232 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_FAULT) 233 234 /* 235 * Both i386 and x86_64 returns 64-bit values in edx:eax for certain 236 * instructions, but GCC's "A" constraint has different meanings. 237 * For i386, "A" means exactly edx:eax, while for x86_64 it 238 * means rax *or* rdx. 239 * 240 * These helpers wrapping these semantic differences save one instruction 241 * clearing the high half of 'low': 242 */ 243 #ifdef CONFIG_X86_64 244 # define EAX_EDX_DECLARE_ARGS(val, low, high) unsigned long low, high 245 # define EAX_EDX_VAL(val, low, high) ((low) | (high) << 32) 246 # define EAX_EDX_RET(val, low, high) "=a" (low), "=d" (high) 247 #else 248 # define EAX_EDX_DECLARE_ARGS(val, low, high) u64 val 249 # define EAX_EDX_VAL(val, low, high) (val) 250 # define EAX_EDX_RET(val, low, high) "=A" (val) 251 #endif 252 253 #endif /* __KERNEL__ */ 254 #endif /* _ASM_X86_ASM_H */ 255