1 /* $NetBSD: asm.h,v 1.5 2003/08/07 16:26:53 agc Exp $ */
4 * Copyright (c) 1990 The Regents of the University of California.
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34 * from: @(#)asm.h 5.5 (Berkeley) 5/7/91
39 #ifndef _MACHINE_ASM_H_
40 #define _MACHINE_ASM_H_
41 #include <sys/cdefs.h>
42 #include <machine/sysreg.h>
45 #define _ASM_LABEL(x) x
48 # define _ALIGN_TEXT .align 2
52 #define STOP_UNWINDING .cantunwind
53 #define _FNSTART .fnstart
55 #define _SAVE(...) .save __VA_ARGS__
57 #define STOP_UNWINDING
64 * gas/arm uses @ as a single comment character and thus cannot be used here.
65 * It recognises the # instead of an @ symbol in .type directives.
67 #define _ASM_TYPE_FUNCTION #function
68 #define _ASM_TYPE_OBJECT #object
70 /* XXX Is this still the right prologue for profiling? */
72 #define _PROF_PROLOGUE \
76 #define _PROF_PROLOGUE
80 * EENTRY()/EEND() mark "extra" entry/exit points from a function.
81 * LEENTRY()/LEEND() are the same for local symbols.
82 * The unwind info cannot handle the concept of a nested function, or a function
83 * with multiple .fnstart directives, but some of our assembler code is written
84 * with multiple labels to allow entry at several points. The EENTRY() macro
85 * defines such an extra entry point without a new .fnstart, so that it's
86 * basically just a label that you can jump to. The EEND() macro does nothing
87 * at all, except document the exit point associated with the same-named entry.
89 #define GLOBAL(x) .global x
92 #define _FUNC_MODE .code 16; .thumb_func
94 #define _FUNC_MODE .code 32
97 #define _LEENTRY(x) .type x,_ASM_TYPE_FUNCTION; _FUNC_MODE; x:
98 #define _LEEND(x) /* nothing */
99 #define _EENTRY(x) GLOBAL(x); _LEENTRY(x)
100 #define _EEND(x) _LEEND(x)
102 #define _LENTRY(x) .text; _ALIGN_TEXT; _LEENTRY(x); _FNSTART
103 #define _LEND(x) .size x, . - x; _FNEND
104 #define _ENTRY(x) .text; _ALIGN_TEXT; _EENTRY(x); _FNSTART
105 #define _END(x) _LEND(x)
107 #define ENTRY(y) _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
108 #define EENTRY(y) _EENTRY(_C_LABEL(y));
109 #define ENTRY_NP(y) _ENTRY(_C_LABEL(y))
110 #define EENTRY_NP(y) _EENTRY(_C_LABEL(y))
111 #define END(y) _END(_C_LABEL(y))
112 #define EEND(y) _EEND(_C_LABEL(y))
113 #define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
114 #define ASLENTRY(y) _LENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
115 #define ASEENTRY(y) _EENTRY(_ASM_LABEL(y));
116 #define ASLEENTRY(y) _LEENTRY(_ASM_LABEL(y));
117 #define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y))
118 #define ASLENTRY_NP(y) _LENTRY(_ASM_LABEL(y))
119 #define ASEENTRY_NP(y) _EENTRY(_ASM_LABEL(y))
120 #define ASLEENTRY_NP(y) _LEENTRY(_ASM_LABEL(y))
121 #define ASEND(y) _END(_ASM_LABEL(y))
122 #define ASLEND(y) _LEND(_ASM_LABEL(y))
123 #define ASEEND(y) _EEND(_ASM_LABEL(y))
124 #define ASLEEND(y) _LEEND(_ASM_LABEL(y))
126 #define ASMSTR .asciz
129 #define PLT_SYM(x) PIC_SYM(x, PLT)
130 #define GOT_SYM(x) PIC_SYM(x, GOT)
131 #define GOT_GET(x,got,sym) \
134 #define GOT_INIT(got,gotsym,pclabel) \
138 #define GOT_INITSYM(gotsym,pclabel) \
140 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4)
142 #define GOT_INITSYM(gotsym,pclabel) \
144 gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+8)
148 #define PIC_SYM(x,y) x ## ( ## y ## )
150 #define PIC_SYM(x,y) x/**/(/**/y/**/)
156 #define GOT_GET(x,got,sym) \
158 #define GOT_INIT(got,gotsym,pclabel)
159 #define GOT_INITSYM(gotsym,pclabel)
160 #define PIC_SYM(x,y) x
164 #if !defined(lint) && !defined(STRIP_FBSDID)
165 #define __FBSDID(s) .ident s
167 #define __FBSDID(s) /* nothing */
171 #define WEAK_ALIAS(alias,sym) \
176 #define WARN_REFERENCES(sym,msg) \
177 .stabs msg ## ,30,0,0,0 ; \
178 .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0
180 #define WARN_REFERENCES(sym,msg) \
181 .stabs msg,30,0,0,0 ; \
182 .stabs __STRING(sym),1,0,0,0
183 #endif /* __STDC__ */
185 /* Exactly one of the __ARM_ARCH_*__ macros will be defined by the compiler. */
186 /* The _ARM_ARCH_* macros are deprecated and will be removed soon. */
187 /* This should be moved into another header so it can be used in
188 * both asm and C code. machine/asm.h cannot be included in C code. */
189 #if defined (__ARM_ARCH_7__) || defined (__ARM_ARCH_7A__)
191 #define _HAVE_ARMv7_INSTRUCTIONS 1
194 #if defined (_HAVE_ARMv7_INSTRUCTIONS) || defined (__ARM_ARCH_6__) || \
195 defined (__ARM_ARCH_6J__) || defined (__ARM_ARCH_6K__) || \
196 defined (__ARM_ARCH_6Z__) || defined (__ARM_ARCH_6ZK__)
198 #define _HAVE_ARMv6_INSTRUCTIONS 1
201 #if defined (_HAVE_ARMv6_INSTRUCTIONS) || defined (__ARM_ARCH_5TE__) || \
202 defined (__ARM_ARCH_5TEJ__) || defined (__ARM_ARCH_5E__)
204 #define _HAVE_ARMv5E_INSTRUCTIONS 1
207 #if defined (_HAVE_ARMv5E_INSTRUCTIONS) || defined (__ARM_ARCH_5__) || \
208 defined (__ARM_ARCH_5T__)
210 #define _HAVE_ARMv5_INSTRUCTIONS 1
213 #if defined (_HAVE_ARMv5_INSTRUCTIONS) || defined (__ARM_ARCH_4T__)
215 #define _HAVE_ARMv4T_INSTRUCTIONS 1
218 /* FreeBSD requires ARMv4, so this is always set. */
219 #define _HAVE_ARMv4_INSTRUCTIONS 1
221 #if defined (_HAVE_ARMv4T_INSTRUCTIONS)
223 # define RETeq bxeq lr
224 # define RETne bxne lr
225 # define RETc(c) bx##c lr
227 # define RET mov pc, lr
228 # define RETeq moveq pc, lr
229 # define RETne movne pc, lr
230 # define RETc(c) mov##c pc, lr
239 #if defined(__ARM_ARCH_7VE__) || defined(__clang__)
240 #define MSR_ELR_HYP(regnum) msr elr_hyp, lr
243 #define MSR_ELR_HYP(regnum) .word (0xe12ef300 | regnum)
244 #define ERET .word 0xe160006e
247 #elif __ARM_ARCH == 6
248 #define ISB mcr CP15_CP15ISB
249 #define DSB mcr CP15_CP15DSB
250 #define DMB mcr CP15_CP15DMB
251 #define WFI mcr CP15_CP15WFI
253 #define ISB mcr CP15_CP15ISB
254 #define DSB mcr CP15_CP15DSB /* DSB and DMB are the */
255 #define DMB mcr CP15_CP15DSB /* same prior to v6.*/
256 /* No form of WFI available on v4, define nothing to get an error on use. */
259 #endif /* !_MACHINE_ASM_H_ */