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Annotation of sys/arch/sparc/include/asm.h, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: asm.h,v 1.4 2003/06/04 22:08:17 deraadt Exp $ */
        !             2: /*     $NetBSD: asm.h,v 1.5 1997/07/16 15:16:43 christos Exp $ */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1994 Allen Briggs
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * Gleaned from locore.s and sun3 asm.h which had the following copyrights:
        !             9:  * locore.s:
        !            10:  * Copyright (c) 1988 University of Utah.
        !            11:  * Copyright (c) 1982, 1990 The Regents of the University of California.
        !            12:  * sun3/include/asm.h:
        !            13:  * Copyright (c) 1993 Adam Glass
        !            14:  * Copyright (c) 1990 The Regents of the University of California.
        !            15:  *
        !            16:  * Redistribution and use in source and binary forms, with or without
        !            17:  * modification, are permitted provided that the following conditions
        !            18:  * are met:
        !            19:  * 1. Redistributions of source code must retain the above copyright
        !            20:  *    notice, this list of conditions and the following disclaimer.
        !            21:  * 2. Redistributions in binary form must reproduce the above copyright
        !            22:  *    notice, this list of conditions and the following disclaimer in the
        !            23:  *    documentation and/or other materials provided with the distribution.
        !            24:  * 3. Neither the name of the University nor the names of its contributors
        !            25:  *    may be used to endorse or promote products derived from this software
        !            26:  *    without specific prior written permission.
        !            27:  *
        !            28:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            29:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            30:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            31:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            32:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            33:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            34:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            35:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            36:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            37:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            38:  * SUCH DAMAGE.
        !            39:  */
        !            40:
        !            41: #ifndef _ASM_H_
        !            42: #define _ASM_H_
        !            43:
        !            44: #ifdef __ELF__
        !            45: #define _C_LABEL(name)         name
        !            46: #else
        !            47: #ifdef __STDC__
        !            48: #define _C_LABEL(name)         _ ## name
        !            49: #else
        !            50: #define _C_LABEL(name)         _/**/name
        !            51: #endif
        !            52: #endif
        !            53: #define        _ASM_LABEL(name)        name
        !            54:
        !            55: /*
        !            56:  * WEAK_ALIAS: create a weak alias (ELF only)
        !            57:  */
        !            58: #ifdef __ELF__
        !            59: #define WEAK_ALIAS(alias,sym)          \
        !            60:        .weak alias;                    \
        !            61:        alias = sym
        !            62: #endif
        !            63:
        !            64: /*
        !            65:  * WARN_REFERENCES: create a warning if the specified symbol is referenced
        !            66:  * (ELF only).
        !            67:  */
        !            68: #ifdef __ELF__
        !            69: #define WARN_REFERENCES(_sym,_msg)     \
        !            70:        .section .gnu.warning. ## _sym ; .ascii _msg ; .text
        !            71: #endif /* __ELF__ */
        !            72:
        !            73:
        !            74: #ifdef PIC
        !            75: /*
        !            76:  * PIC_PROLOGUE() is akin to the compiler generated function prologue for
        !            77:  * PIC code. It leaves the address of the Global Offset Table in DEST,
        !            78:  * clobbering register TMP in the process. Using the temporary enables us
        !            79:  * to work without a stack frame (doing so requires saving %o7) .
        !            80:  */
        !            81: #define PIC_PROLOGUE(dest,tmp) \
        !            82:        mov %o7,tmp; 3: call 4f; nop; 4: \
        !            83:        sethi %hi(_C_LABEL(_GLOBAL_OFFSET_TABLE_)-(3b-.)),dest; \
        !            84:        or dest,%lo(_C_LABEL(_GLOBAL_OFFSET_TABLE_)-(3b-.)),dest; \
        !            85:        add dest,%o7,dest; mov tmp,%o7
        !            86:
        !            87: /*
        !            88:  * PICCY_SET() does the equivalent of a `set var, %dest' instruction in
        !            89:  * a PIC-like way, but without involving the Global Offset Table. This
        !            90:  * only works for VARs defined in the same file *and* in the text segment.
        !            91:  */
        !            92: #define PICCY_SET(var,dest,tmp) \
        !            93:        mov %o7,tmp; 3: call 4f; nop; 4: \
        !            94:        add %o7,(var-3b),dest; mov tmp,%o7
        !            95: #else
        !            96: #define PIC_PROLOGUE(dest,tmp)
        !            97: #define PICCY_OFFSET(var,dest,tmp)
        !            98: #endif
        !            99:
        !           100: #define FTYPE(x)               .type x,@function
        !           101: #define OTYPE(x)               .type x,@object
        !           102:
        !           103: #define        _ENTRY(name) \
        !           104:        .align 4; .globl name; .proc 1; FTYPE(name); name:
        !           105:
        !           106: #ifdef GPROF
        !           107: #define _PROF_PROLOGUE \
        !           108:        .data; .align 4; 1: .long 0; \
        !           109:        .text; save %sp,-96,%sp; sethi %hi(1b),%o0; call mcount; \
        !           110:        or %o0,%lo(1b),%o0; restore
        !           111: #else
        !           112: #define _PROF_PROLOGUE
        !           113: #endif
        !           114:
        !           115: #define ENTRY(name)            _ENTRY(_C_LABEL(name)); _PROF_PROLOGUE
        !           116: #define        ASENTRY(name)           _ENTRY(_ASM_LABEL(name)); _PROF_PROLOGUE
        !           117: #define        FUNC(name)              ASENTRY(name)
        !           118:
        !           119:
        !           120: #define ASMSTR                 .asciz
        !           121:
        !           122: #define RCSID(name)            .asciz name
        !           123:
        !           124: #endif /* _ASM_H_ */