Loading...
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/*
117 * Macros to generate condition code outputs from inline assembly,
118 * The output operand must be type "bool".
119 */
120#ifdef __GCC_ASM_FLAG_OUTPUTS__
121# define CC_SET(c) "\n\t/* output condition code " #c "*/\n"
122# define CC_OUT(c) "=@cc" #c
123#else
124# define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n"
125# define CC_OUT(c) [_cc_ ## c] "=qm"
126#endif
127
128#ifdef __KERNEL__
129
130# include <asm/extable_fixup_types.h>
131
132/* Exception table entry */
133#ifdef __ASSEMBLY__
134
135# define _ASM_EXTABLE_TYPE(from, to, type) \
136 .pushsection "__ex_table","a" ; \
137 .balign 4 ; \
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 /* ! __ASSEMBLY__ */
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 " .long (" #from ") - .\n" \
186 " .long (" #to ") - .\n" \
187 " .long " __stringify(type) " \n" \
188 " .popsection\n"
189
190# define _ASM_EXTABLE_TYPE_REG(from, to, type, reg) \
191 " .pushsection \"__ex_table\",\"a\"\n" \
192 " .balign 4\n" \
193 " .long (" #from ") - .\n" \
194 " .long (" #to ") - .\n" \
195 DEFINE_EXTABLE_TYPE_REG \
196 "extable_type_reg reg=" __stringify(reg) ", type=" __stringify(type) " \n"\
197 UNDEFINE_EXTABLE_TYPE_REG \
198 " .popsection\n"
199
200/* For C file, we already have NOKPROBE_SYMBOL macro */
201
202/*
203 * This output constraint should be used for any inline asm which has a "call"
204 * instruction. Otherwise the asm may be inserted before the frame pointer
205 * gets set up by the containing function. If you forget to do this, objtool
206 * may print a "call without frame pointer save/setup" warning.
207 */
208register unsigned long current_stack_pointer asm(_ASM_SP);
209#define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
210#endif /* __ASSEMBLY__ */
211
212#define _ASM_EXTABLE(from, to) \
213 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_DEFAULT)
214
215#define _ASM_EXTABLE_UA(from, to) \
216 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_UACCESS)
217
218#define _ASM_EXTABLE_CPY(from, to) \
219 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_COPY)
220
221#define _ASM_EXTABLE_FAULT(from, to) \
222 _ASM_EXTABLE_TYPE(from, to, EX_TYPE_FAULT)
223
224#endif /* __KERNEL__ */
225#endif /* _ASM_X86_ASM_H */
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#ifdef CONFIG_X86_32
15# define __ASM_SEL(a,b) __ASM_FORM(a)
16# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a)
17#else
18# define __ASM_SEL(a,b) __ASM_FORM(b)
19# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b)
20#endif
21
22#define __ASM_SIZE(inst, ...) __ASM_SEL(inst##l##__VA_ARGS__, \
23 inst##q##__VA_ARGS__)
24#define __ASM_REG(reg) __ASM_SEL_RAW(e##reg, r##reg)
25
26#define _ASM_PTR __ASM_SEL(.long, .quad)
27#define _ASM_ALIGN __ASM_SEL(.balign 4, .balign 8)
28
29#define _ASM_MOV __ASM_SIZE(mov)
30#define _ASM_INC __ASM_SIZE(inc)
31#define _ASM_DEC __ASM_SIZE(dec)
32#define _ASM_ADD __ASM_SIZE(add)
33#define _ASM_SUB __ASM_SIZE(sub)
34#define _ASM_XADD __ASM_SIZE(xadd)
35
36#define _ASM_AX __ASM_REG(ax)
37#define _ASM_BX __ASM_REG(bx)
38#define _ASM_CX __ASM_REG(cx)
39#define _ASM_DX __ASM_REG(dx)
40#define _ASM_SP __ASM_REG(sp)
41#define _ASM_BP __ASM_REG(bp)
42#define _ASM_SI __ASM_REG(si)
43#define _ASM_DI __ASM_REG(di)
44
45/* Exception table entry */
46#ifdef __ASSEMBLY__
47# define _ASM_EXTABLE_HANDLE(from, to, handler) \
48 .pushsection "__ex_table","a" ; \
49 .balign 4 ; \
50 .long (from) - . ; \
51 .long (to) - . ; \
52 .long (handler) - . ; \
53 .popsection
54
55# define _ASM_EXTABLE(from, to) \
56 _ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
57
58# define _ASM_EXTABLE_FAULT(from, to) \
59 _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
60
61# define _ASM_EXTABLE_EX(from, to) \
62 _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
63
64# define _ASM_NOKPROBE(entry) \
65 .pushsection "_kprobe_blacklist","aw" ; \
66 _ASM_ALIGN ; \
67 _ASM_PTR (entry); \
68 .popsection
69
70.macro ALIGN_DESTINATION
71 /* check for bad alignment of destination */
72 movl %edi,%ecx
73 andl $7,%ecx
74 jz 102f /* already aligned */
75 subl $8,%ecx
76 negl %ecx
77 subl %ecx,%edx
78100: movb (%rsi),%al
79101: movb %al,(%rdi)
80 incq %rsi
81 incq %rdi
82 decl %ecx
83 jnz 100b
84102:
85 .section .fixup,"ax"
86103: addl %ecx,%edx /* ecx is zerorest also */
87 jmp copy_user_handle_tail
88 .previous
89
90 _ASM_EXTABLE(100b,103b)
91 _ASM_EXTABLE(101b,103b)
92 .endm
93
94#else
95# define _EXPAND_EXTABLE_HANDLE(x) #x
96# define _ASM_EXTABLE_HANDLE(from, to, handler) \
97 " .pushsection \"__ex_table\",\"a\"\n" \
98 " .balign 4\n" \
99 " .long (" #from ") - .\n" \
100 " .long (" #to ") - .\n" \
101 " .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n" \
102 " .popsection\n"
103
104# define _ASM_EXTABLE(from, to) \
105 _ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
106
107# define _ASM_EXTABLE_FAULT(from, to) \
108 _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
109
110# define _ASM_EXTABLE_EX(from, to) \
111 _ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
112
113/* For C file, we already have NOKPROBE_SYMBOL macro */
114#endif
115
116#endif /* _ASM_X86_ASM_H */