Annotation of sys/arch/m68k/include/asm.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: asm.h,v 1.7 2007/05/15 13:46:22 martin Exp $ */
! 2: /* $NetBSD: asm.h,v 1.13 1997/04/24 22:49:39 thorpej Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1997 Jason R. Thorpe. All rights reserved.
! 6: * Copyright (c) 1994 Allen Briggs
! 7: * All rights reserved.
! 8: *
! 9: * Gleaned from locore.s and sun3 asm.h which had the following copyrights:
! 10: * locore.s:
! 11: * Copyright (c) 1988 University of Utah.
! 12: * Copyright (c) 1982, 1990 The Regents of the University of California.
! 13: * sun3/include/asm.h:
! 14: * Copyright (c) 1993 Adam Glass
! 15: * Copyright (c) 1990 The Regents of the University of California.
! 16: *
! 17: * Redistribution and use in source and binary forms, with or without
! 18: * modification, are permitted provided that the following conditions
! 19: * are met:
! 20: * 1. Redistributions of source code must retain the above copyright
! 21: * notice, this list of conditions and the following disclaimer.
! 22: * 2. Redistributions in binary form must reproduce the above copyright
! 23: * notice, this list of conditions and the following disclaimer in the
! 24: * documentation and/or other materials provided with the distribution.
! 25: * 3. Neither the name of the University nor the names of its contributors
! 26: * may be used to endorse or promote products derived from this software
! 27: * without specific prior written permission.
! 28: *
! 29: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 30: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 31: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 32: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 33: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 34: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 35: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 36: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 37: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 38: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 39: * SUCH DAMAGE.
! 40: */
! 41:
! 42: #ifndef _ASM_H_
! 43: #define _ASM_H_
! 44:
! 45: #ifdef __ELF__
! 46: #define _C_LABEL(name) name
! 47: #else
! 48: #ifdef __STDC__
! 49: #define _C_LABEL(name) _ ## name
! 50: #else
! 51: #define _C_LABEL(name) _/**/name
! 52: #endif /* __STDC__ */
! 53: #endif
! 54:
! 55: #define _ASM_LABEL(name) name
! 56:
! 57: #ifndef _KERNEL
! 58: #define _ENTRY(name) \
! 59: .text; .even; .globl name; .type name,@function; name:
! 60: #else
! 61: #define _ENTRY(name) \
! 62: .text; .even; .globl name; name:
! 63: #endif
! 64:
! 65: #ifdef GPROF
! 66: #define _PROF_PROLOG link a6,#0; jbsr mcount; unlk a6
! 67: #else
! 68: #define _PROF_PROLOG
! 69: #endif
! 70:
! 71: #define ENTRY(name) _ENTRY(_C_LABEL(name)) _PROF_PROLOG
! 72: #define ASENTRY(name) _ENTRY(_ASM_LABEL(name)) _PROF_PROLOG
! 73:
! 74: #define ENTRY_NOPROFILE(name) _ENTRY(_C_LABEL(name))
! 75: #define ASENTRY_NOPROFILE(name) _ENTRY(_ASM_LABEL(name))
! 76:
! 77: /*
! 78: * The m68k ALTENTRY macro is very different than the traditional
! 79: * implementation used by other OpenBSD ports. Usually ALTENTRY
! 80: * simply provides an alternate function entry point. The m68k
! 81: * definition takes a second argument and jumps inside the second
! 82: * function when profiling is enabled.
! 83: *
! 84: * The m68k behavior is similar to the ENTRY2 macro found in
! 85: * solaris' asm_linkage.h.
! 86: *
! 87: * Providing ENTRY2 and changing all the code that uses ALTENTRY
! 88: * to use it would be a desirable change.
! 89: */
! 90: #ifdef PROF
! 91: #define ALTENTRY(name, rname) ENTRY(name); jra rname+12
! 92: #else
! 93: #define ALTENTRY(name, rname) _ENTRY(_C_LABEL(name))
! 94: #endif
! 95:
! 96: #define RCSID(x) .text ; \
! 97: .asciz x ; \
! 98: .even
! 99:
! 100: #ifdef __ELF__
! 101: #define WEAK_ALIAS(alias,sym) \
! 102: .weak alias; \
! 103: alias = sym
! 104: #else
! 105: #ifdef __STDC__
! 106: #define WEAK_ALIAS(alias,sym) \
! 107: .weak _##alias; \
! 108: _##alias = _##sym
! 109: #else
! 110: #define WEAK_ALIAS(alias,sym) \
! 111: .weak _/**/alias; \
! 112: _/**/alias = _/**/sym
! 113: #endif
! 114: #endif
! 115:
! 116: /*
! 117: * Global variables of whatever sort.
! 118: */
! 119: #define GLOBAL(x) \
! 120: .globl _C_LABEL(x) ; \
! 121: _C_LABEL(x):
! 122:
! 123: #define ASGLOBAL(x) \
! 124: .globl _ASM_LABEL(x) ; \
! 125: _ASM_LABEL(x):
! 126:
! 127: /*
! 128: * ...and local variables.
! 129: */
! 130: #define LOCAL(x) \
! 131: _C_LABEL(x):
! 132:
! 133: #define ASLOCAL(x) \
! 134: _ASM_LABEL(x):
! 135:
! 136: /*
! 137: * Items in the BSS segment.
! 138: */
! 139: #define BSS(name, size) \
! 140: .comm _C_LABEL(name),size
! 141:
! 142: #define ASBSS(name, size) \
! 143: .comm _ASM_LABEL(name),size
! 144:
! 145: #ifdef _KERNEL
! 146: /*
! 147: * Shorthand for calling panic().
! 148: * Note the side-effect: it uses up the 9: label, so be careful!
! 149: */
! 150: #define PANIC(x) \
! 151: pea 9f ; \
! 152: jbsr _C_LABEL(panic) ; \
! 153: 9: .asciz x ; \
! 154: .even
! 155:
! 156: /*
! 157: * Shorthand for defining vectors for the vector table.
! 158: */
! 159: #define VECTOR(x) \
! 160: .long _C_LABEL(x)
! 161:
! 162: #define ASVECTOR(x) \
! 163: .long _ASM_LABEL(x)
! 164:
! 165: #define VECTOR_UNUSED \
! 166: .long 0
! 167:
! 168: #define CURPROC _C_LABEL(cpu_info_store) + CI_CURPROC
! 169:
! 170: #endif /* _KERNEL */
! 171:
! 172: #endif /* _ASM_H_ */
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