Annotation of src/sys/arch/mips/include/asm.h, Revision 1.26
1.26 ! cgd 1: /* $NetBSD: asm.h,v 1.25 2000/07/25 17:56:05 jeffs Exp $ */
1.4 cgd 2:
1.1 deraadt 3: /*
1.2 glass 4: * Copyright (c) 1992, 1993
5: * The Regents of the University of California. All rights reserved.
1.1 deraadt 6: *
7: * This code is derived from software contributed to Berkeley by
8: * Ralph Campbell.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by the University of
21: * California, Berkeley and its contributors.
22: * 4. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: *
1.4 cgd 38: * @(#)machAsmDefs.h 8.1 (Berkeley) 6/10/93
1.1 deraadt 39: */
40:
41: /*
42: * machAsmDefs.h --
43: *
44: * Macros used when writing assembler programs.
45: *
46: * Copyright (C) 1989 Digital Equipment Corporation.
47: * Permission to use, copy, modify, and distribute this software and
48: * its documentation for any purpose and without fee is hereby granted,
49: * provided that the above copyright notice appears in all copies.
50: * Digital Equipment Corporation makes no representations about the
51: * suitability of this software for any purpose. It is provided "as is"
52: * without express or implied warranty.
53: *
54: * from: Header: /sprite/src/kernel/mach/ds3100.md/RCS/machAsmDefs.h,
1.2 glass 55: * v 1.2 89/08/15 18:28:24 rab Exp SPRITE (DECWRL)
1.1 deraadt 56: */
57:
1.8 jonathan 58: #ifndef _MIPS_ASM_H
59: #define _MIPS_ASM_H
1.1 deraadt 60:
1.21 soda 61: #include <mips/regdef.h>
1.1 deraadt 62:
63: /*
64: * Define -pg profile entry code.
1.23 castor 65: * Must always be noreorder, must never use a macro instruction
66: * Final addiu to t9 must always equal the size of this _KERN_MCOUNT
1.1 deraadt 67: */
1.23 castor 68: #define _KERN_MCOUNT \
69: .set push; \
70: .set noreorder; \
71: .set noat; \
72: sw t9,-4(sp); \
73: move AT,ra; \
74: lui t9,%hi(_mcount); \
75: addiu t9,t9,%lo(_mcount); \
76: jalr t9; \
77: subu sp,sp,16; \
78: lw t9,4(sp); \
79: addiu sp,sp,8; \
80: addiu t9,t9,36; \
81: .set pop;
1.13 jonathan 82:
1.11 jtc 83: #ifdef GPROF
1.23 castor 84: #define MCOUNT _KERN_MCOUNT
1.1 deraadt 85: #else
86: #define MCOUNT
1.2 glass 87: #endif
1.1 deraadt 88:
1.7 mellon 89: #ifdef __NO_LEADING_UNDERSCORES__
1.6 mycroft 90: # define _C_LABEL(x) x
91: #else
92: # ifdef __STDC__
93: # define _C_LABEL(x) _ ## x
94: # else
95: # define _C_LABEL(x) _/**/x
96: # endif
97: #endif
1.14 thorpej 98:
1.15 castor 99: #ifdef USE_AENT
100: #define AENT(x) \
101: .aent x, 0
102: #else
103: #define AENT(x)
1.24 kleink 104: #endif
105:
106: #ifdef __ELF__
107: #define WEAK_ALIAS(alias,sym) \
108: .weak alias; \
109: alias = sym
1.15 castor 110: #endif
111:
1.14 thorpej 112: /*
113: * WARN_REFERENCES: create a warning if the specified symbol is referenced
114: * (ELF only, and thus, no leading underscores).
115: */
116: #ifdef __ELF__
117: #ifdef __STDC__
118: #define WARN_REFERENCES(_sym,_msg) \
119: .section .gnu.warning. ## _sym ; .ascii _msg ; .text
120: #else
121: #define WARN_REFERENCES(_sym,_msg) \
122: .section .gnu.warning./**/_sym ; .ascii _msg ; .text
123: #endif /* __STDC__ */
124: #endif /* __ELF__ */
1.6 mycroft 125:
1.1 deraadt 126: /*
1.15 castor 127: * LEAF
128: * A leaf routine does
129: * - call no other function,
130: * - never use any register that callee-saved (S0-S8), and
131: * - not use any local stack storage.
132: */
133: #define LEAF(x) \
134: .globl _C_LABEL(x); \
135: .ent _C_LABEL(x), 0; \
136: _C_LABEL(x): ; \
137: .frame sp, 0, ra; \
1.1 deraadt 138: MCOUNT
139:
140: /*
1.15 castor 141: * LEAF_NOPROFILE
142: * No profilable leaf routine.
1.1 deraadt 143: */
1.15 castor 144: #define LEAF_NOPROFILE(x) \
145: .globl _C_LABEL(x); \
146: .ent _C_LABEL(x), 0; \
147: _C_LABEL(x): ; \
148: .frame sp, 0, ra
149:
150: /*
151: * XLEAF
152: * declare alternate entry to leaf routine
153: */
154: #define XLEAF(x) \
155: .globl _C_LABEL(x); \
1.20 soda 156: AENT (_C_LABEL(x)); \
1.15 castor 157: _C_LABEL(x):
158:
159: /*
160: * NESTED
161: * A function calls other functions and needs
162: * therefore stack space to save/restore registers.
163: */
164: #define NESTED(x, fsize, retpc) \
165: .globl _C_LABEL(x); \
166: .ent _C_LABEL(x), 0; \
167: _C_LABEL(x): ; \
168: .frame sp, fsize, retpc; \
169: MCOUNT
1.1 deraadt 170:
171: /*
1.15 castor 172: * NESTED_NOPROFILE(x)
173: * No profilable nested routine.
1.1 deraadt 174: */
1.15 castor 175: #define NESTED_NOPROFILE(x, fsize, retpc) \
176: .globl _C_LABEL(x); \
177: .ent _C_LABEL(x), 0; \
178: _C_LABEL(x): ; \
179: .frame sp, fsize, retpc
180:
181: /*
182: * XNESTED
183: * declare alternate entry point to nested routine.
184: */
185: #define XNESTED(x) \
186: .globl _C_LABEL(x); \
1.20 soda 187: AENT (_C_LABEL(x)); \
1.6 mycroft 188: _C_LABEL(x):
1.1 deraadt 189:
190: /*
1.15 castor 191: * END
192: * Mark end of a procedure.
1.1 deraadt 193: */
1.15 castor 194: #define END(x) \
195: .end _C_LABEL(x)
1.2 glass 196:
197: /*
1.15 castor 198: * IMPORT -- import external symbol
1.2 glass 199: */
1.15 castor 200: #define IMPORT(sym, size) \
1.20 soda 201: .extern _C_LABEL(sym),size
1.1 deraadt 202:
203: /*
1.15 castor 204: * EXPORT -- export definition of symbol
1.1 deraadt 205: */
1.15 castor 206: #define EXPORT(x) \
207: .globl _C_LABEL(x); \
208: _C_LABEL(x):
1.1 deraadt 209:
1.15 castor 210: /*
1.17 jonathan 211: * VECTOR
212: * exception vector entrypoint
1.20 soda 213: * XXX: regmask should be used to generate .mask
1.17 jonathan 214: */
215: #define VECTOR(x, regmask) \
216: .ent _C_LABEL(x),0; \
217: EXPORT(x); \
218:
1.19 soda 219: #ifdef __STDC__
220: #define VECTOR_END(x) \
1.20 soda 221: EXPORT(x ## End); \
222: END(x)
1.19 soda 223: #else
1.17 jonathan 224: #define VECTOR_END(x) \
1.20 soda 225: EXPORT(x/**/End); \
226: END(x)
1.19 soda 227: #endif
1.1 deraadt 228:
229: /*
1.10 christos 230: * Macros to panic and printf from assembly language.
1.1 deraadt 231: */
1.15 castor 232: #define PANIC(msg) \
233: la a0, 9f; \
234: jal _C_LABEL(panic); \
1.26 ! cgd 235: nop; \
1.1 deraadt 236: MSG(msg)
237:
1.15 castor 238: #define PRINTF(msg) \
239: la a0, 9f; \
240: jal _C_LABEL(printf); \
1.26 ! cgd 241: nop; \
1.1 deraadt 242: MSG(msg)
243:
1.15 castor 244: #define MSG(msg) \
245: .rdata; \
246: 9: .asciiz msg; \
1.1 deraadt 247: .text
248:
1.15 castor 249: #define ASMSTR(str) \
250: .asciiz str; \
1.12 jonathan 251: .align 3
1.15 castor 252:
253: /*
254: * XXX retain dialects XXX
255: */
1.19 soda 256: #define ALEAF(x) XLEAF(x)
257: #define NLEAF(x) LEAF_NOPROFILE(x)
258: #define NON_LEAF(x, fsize, retpc) NESTED(x, fsize, retpc)
259: #define NNON_LEAF(x, fsize, retpc) NESTED_NOPROFILE(x, fsize, retpc)
1.15 castor 260:
1.22 simonb 261: /*
1.16 castor 262: * standard callframe {
263: * register_t cf_args[4]; arg0 - arg3
264: * register_t cf_sp; frame pointer
265: * register_t cf_ra; return address
266: * };
267: */
268: #define CALLFRAME_SIZ (4 * (4 + 2))
269: #define CALLFRAME_SP (4 * 4)
270: #define CALLFRAME_RA (4 * 5)
271:
1.15 castor 272: /*
1.22 simonb 273: * While it would be nice to be compatible with the SGI
1.15 castor 274: * REG_L and REG_S macros, because they do not take parameters, it
275: * is impossible to use them with the _MIPS_SIM_ABIX32 model.
276: *
1.22 simonb 277: * These macros hide the use of mips3 instructions from the
1.15 castor 278: * assembler to prevent the assembler from generating 64-bit style
279: * ABI calls.
280: */
281:
1.16 castor 282: #if !defined(_MIPS_BSD_API) || _MIPS_BSD_API == _MIPS_BSD_API_LP32
283: #define REG_L lw
284: #define REG_S sw
285: #define REG_LI li
1.22 simonb 286: #define REG_PROLOGUE .set push
1.16 castor 287: #define REG_EPILOGUE .set pop
288: #define SZREG 4
289: #else
1.15 castor 290: #define REG_L ld
291: #define REG_S sd
292: #define REG_LI dli
293: #define REG_PROLOGUE .set push ; .set mips3
294: #define REG_EPILOGUE .set pop
295: #define SZREG 8
1.16 castor 296: #endif /* _MIPS_BSD_API */
1.25 jeffs 297:
298: /*
299: * The DYNAMIC_STATUS_MASK option adds an additional masking operation
300: * when updating the hardware interrupt mask in the status register.
301: *
302: * This is useful for platforms that need to at run-time mask
303: * interrupts based on motherboard configuration or to handle
304: * slowly clearing interrupts.
305: *
306: * XXX this is only currently implemented for mips3.
307: */
308: #ifdef MIPS_DYNAMIC_STATUS_MASK
309: #define DYNAMIC_STATUS_MASK(sr,scratch) \
310: lw scratch, mips_dynamic_status_mask; \
311: and sr, sr, scratch
312: #else
313: #define DYNAMIC_STATUS_MASK(sr,scratch)
314: #endif
1.1 deraadt 315:
1.8 jonathan 316: #endif /* _MIPS_ASM_H */
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