1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)DEFS.h 5.1 (Berkeley) 4/23/90 37 * $FreeBSD$ 38 */ 39 40 #ifndef _MACHINE_ASM_H_ 41 #define _MACHINE_ASM_H_ 42 43 #include <sys/cdefs.h> 44 45 #ifdef PIC 46 #define PIC_PLT(x) x@PLT 47 #define PIC_GOT(x) x@GOTPCREL(%rip) 48 #else 49 #define PIC_PLT(x) x 50 #define PIC_GOT(x) x 51 #endif 52 53 /* 54 * CNAME and HIDENAME manage the relationship between symbol names in C 55 * and the equivalent assembly language names. CNAME is given a name as 56 * it would be used in a C program. It expands to the equivalent assembly 57 * language name. HIDENAME is given an assembly-language name, and expands 58 * to a possibly-modified form that will be invisible to C programs. 59 */ 60 #define CNAME(csym) csym 61 #define HIDENAME(asmsym) __CONCAT(.,asmsym) 62 63 /* XXX should use .p2align 4,0x90 for -m486. */ 64 #define _START_ENTRY .text; .p2align 2,0x90 65 66 #define _ENTRY(x) _START_ENTRY; \ 67 .globl CNAME(x); .type CNAME(x),@function; CNAME(x): 68 69 #ifdef PROF 70 #define ALTENTRY(x) _ENTRY(x); \ 71 pushl %rbp; movl %rsp,%rbp; \ 72 call PIC_PLT(HIDENAME(mcount)); \ 73 popl %rbp; \ 74 jmp 9f 75 #define ENTRY(x) _ENTRY(x); \ 76 pushl %rbp; movl %rsp,%rbp; \ 77 call PIC_PLT(HIDENAME(mcount)); \ 78 popl %rbp; \ 79 9: 80 #else 81 #define ALTENTRY(x) _ENTRY(x) 82 #define ENTRY(x) _ENTRY(x) 83 #endif 84 85 #define RCSID(x) .text; .asciz x 86 87 #undef __FBSDID 88 #if !defined(lint) && !defined(STRIP_FBSDID) 89 #define __FBSDID(s) .ident s 90 #else 91 #define __FBSDID(s) /* nothing */ 92 #endif /* not lint and not STRIP_FBSDID */ 93 94 #ifdef _ARCH_INDIRECT 95 /* 96 * Generate code to select between the generic functions and _ARCH_INDIRECT 97 * specific ones. 98 * XXX nested __CONCATs don't work with non-ANSI cpp's. 99 */ 100 #define ANAME(x) CNAME(__CONCAT(__CONCAT(__,_ARCH_INDIRECT),x)) 101 #define ASELNAME(x) CNAME(__CONCAT(__arch_select_,x)) 102 #define AVECNAME(x) CNAME(__CONCAT(__arch_,x)) 103 #define GNAME(x) CNAME(__CONCAT(__generic_,x)) 104 105 /* Don't bother profiling this. */ 106 #ifdef PIC 107 #define ARCH_DISPATCH(x) \ 108 _START_ENTRY; \ 109 .globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \ 110 movq PIC_GOT(AVECNAME(x)),%rax; \ 111 jmpq *(%rax) 112 113 #define ARCH_SELECT(x) _START_ENTRY; \ 114 .type ASELNAME(x),@function; \ 115 ASELNAME(x): \ 116 call PIC_PLT(CNAME(__get_hw_float)); \ 117 testq %rax,%rax; \ 118 movq PIC_GOT(ANAME(x)),%rax; \ 119 jne 8f; \ 120 movq PIC_GOT(GNAME(x)),%rax; \ 121 8: \ 122 movq PIC_GOT(AVECNAME(x)),%rdx; \ 123 movq %rax,(%rdx); \ 124 jmpq *%rax 125 #else /* !PIC */ 126 #define ARCH_DISPATCH(x) \ 127 _START_ENTRY; \ 128 .globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \ 129 jmpw *AVECNAME(x) 130 131 #define ARCH_SELECT(x) _START_ENTRY; \ 132 .type ASELNAME(x),@function; \ 133 ASELNAME(x): \ 134 call CNAME(__get_hw_float); \ 135 testw %rax,%rax; \ 136 movw $ANAME(x),%rax; \ 137 jne 8f; \ 138 movw $GNAME(x),%rax; \ 139 8: \ 140 movw %rax,AVECNAME(x); \ 141 jmpw *%rax 142 #endif /* PIC */ 143 144 #define ARCH_VECTOR(x) .data; .p2align 2; \ 145 .globl AVECNAME(x); \ 146 .type AVECNAME(x),@object; \ 147 .size AVECNAME(x),4; \ 148 AVECNAME(x): .long ASELNAME(x) 149 150 #undef _ENTRY 151 #define _ENTRY(x) ARCH_VECTOR(x); ARCH_SELECT(x); ARCH_DISPATCH(x); \ 152 _START_ENTRY; \ 153 .globl ANAME(x); .type ANAME(x),@function; ANAME(x): 154 155 #endif /* _ARCH_INDIRECT */ 156 157 #endif /* !_MACHINE_ASM_H_ */ 158