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Annotation of sys/arch/sparc/include/asm.h, Revision 1.1.1.1

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_ */