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1.1 nbrk 1: /* $OpenBSD: asm.h,v 1.1.1.1 2006/10/06 21:02:55 miod Exp $ */
2: /* $NetBSD: asm.h,v 1.25 2006/01/20 22:02:40 christos Exp $ */
3:
4: /*-
5: * Copyright (c) 1990 The Regents of the University of California.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * William Jolitz.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: *
35: * @(#)asm.h 5.5 (Berkeley) 5/7/91
36: */
37:
38: #ifndef _SH_ASM_H_
39: #define _SH_ASM_H_
40:
41: #ifdef __ELF__
42: # define _C_LABEL(x) x
43: #else
44: #ifdef __STDC__
45: # define _C_LABEL(x) _ ## x
46: #else
47: # define _C_LABEL(x) _/**/x
48: #endif
49: #endif
50: #define _ASM_LABEL(x) x
51:
52: #ifdef __STDC__
53: # define __CONCAT(x,y) x ## y
54: # define __STRING(x) #x
55: #else
56: # define __CONCAT(x,y) x/**/y
57: # define __STRING(x) "x"
58: #endif
59:
60: /* let kernels and others override entrypoint alignment */
61: #ifndef _ALIGN_TEXT
62: # define _ALIGN_TEXT .align 2
63: #endif
64:
65: #ifdef __ELF__
66: #define _ENTRY(x) \
67: .text ;\
68: _ALIGN_TEXT ;\
69: .globl x ;\
70: .type x,@function ;\
71: x:
72: #else /* !__ELF__ */
73: #define _ENTRY(x) \
74: .text ;\
75: _ALIGN_TEXT ;\
76: .globl x ;\
77: x:
78: #endif /* !__ELF__ */
79:
80: #ifdef GPROF
81: #define _PROF_PROLOGUE \
82: mov.l 1f,r1 ; \
83: mova 2f,r0 ; \
84: jmp @r1 ; \
85: nop ; \
86: .align 2 ; \
87: 1: .long __mcount ; \
88: 2:
89: #else /* !GPROF */
90: #define _PROF_PROLOGUE
91: #endif /* !GPROF */
92:
93: #define ENTRY(y) _ENTRY(_C_LABEL(y)) _PROF_PROLOGUE
94: #define NENTRY(y) _ENTRY(_C_LABEL(y))
95: #define ASENTRY(y) _ENTRY(_ASM_LABEL(y)) _PROF_PROLOGUE
96:
97: #define SET_ENTRY_SIZE(y) \
98: .size _C_LABEL(y), . - _C_LABEL(y)
99:
100: #define SET_ASENTRY_SIZE(y) \
101: .size _ASM_LABEL(y), . - _ASM_LABEL(y)
102:
103: #ifdef __ELF__
104: #define ALTENTRY(name) \
105: .globl _C_LABEL(name) ;\
106: .type _C_LABEL(name),@function ;\
107: _C_LABEL(name):
108: #else
109: #define ALTENTRY(name) \
110: .globl _C_LABEL(name) ;\
111: _C_LABEL(name):
112: #endif
113:
114:
115: /*
116: * Hide the gory details of PIC calls vs. normal calls. Use as in the
117: * following example:
118: *
119: * sts.l pr, @-sp
120: * PIC_PROLOGUE(.L_got, r0) ! saves old r12 on stack
121: * ...
122: * mov.l .L_function_1, r0
123: * 1: CALL r0 ! each call site needs a label
124: * nop
125: * ...
126: * mov.l .L_function_2, r0
127: * 2: CALL r0
128: * nop
129: * ...
130: * PIC_EPILOGUE ! restores r12 from stack
131: * lds.l @sp+, pr ! so call in right order
132: * rts
133: * nop
134: *
135: * .align 2
136: * .L_got:
137: * PIC_GOT_DATUM
138: * .L_function_1: ! if you call the same function twice
139: * CALL_DATUM(function, 1b) ! provide call datum for each call
140: * .L_function_2:
141: * CALL_DATUM(function, 2b)
142: */
143:
144: #ifdef PIC
145:
146: #define PIC_PLT(x) x@PLT
147: #define PIC_GOT(x) x@GOT
148: #define PIC_GOTOFF(x) x@GOTOFF
149:
150: #define PIC_PROLOGUE(got) \
151: mov.l r12, @-sp; \
152: PIC_PROLOGUE_NOSAVE(got)
153:
154: /*
155: * Functions that do non local jumps don't need to preserve r12,
156: * so we can shave off two instructions to save/restore it.
157: */
158: #define PIC_PROLOGUE_NOSAVE(got) \
159: mov.l got, r12; \
160: mova got, r0; \
161: add r0, r12
162:
163: #define PIC_EPILOGUE \
164: mov.l @sp+, r12
165:
166: #define PIC_EPILOGUE_SLOT \
167: PIC_EPILOGUE
168:
169: #define PIC_GOT_DATUM \
170: .long _GLOBAL_OFFSET_TABLE_
171:
172: #define CALL bsrf
173: #define JUMP braf
174:
175: #define CALL_DATUM(function, lpcs) \
176: .long PIC_PLT(function) - ((lpcs) + 4 - (.))
177:
178: /*
179: * This will result in text relocations in the shared library,
180: * unless the function is local or has hidden or protected visibility.
181: * Does not require PIC prologue.
182: */
183: #define CALL_DATUM_LOCAL(function, lpcs) \
184: .long function - ((lpcs) + 4)
185:
186: #else /* !PIC */
187:
188: #define PIC_PROLOGUE(label)
189: #define PIC_PROLOGUE_NOSAVE(label)
190: #define PIC_EPILOGUE
191: #define PIC_EPILOGUE_SLOT nop
192: #define PIC_GOT_DATUM
193:
194: #define CALL jsr @
195: #define JUMP jmp @
196:
197: #define CALL_DATUM(function, lpcs) \
198: .long function
199:
200: #define CALL_DATUM_LOCAL(function, lpcs) \
201: .long function
202:
203: #endif /* !PIC */
204:
205:
206: #define ASMSTR .asciz
207:
208: #ifdef __ELF__
209: #define WEAK_ALIAS(alias,sym) \
210: .weak _C_LABEL(alias); \
211: _C_LABEL(alias) = _C_LABEL(sym)
212: #endif
213:
214: #define WARN_REFERENCES(_sym,_msg) \
215: .section .gnu.warning._sym; .ascii _msg; .previous
216:
217: #endif /* !_SH_ASM_H_ */