asmacros.h revision 1817
1/*- 2 * Copyright (c) 1993 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $Id$ 34 */ 35 36#define ALIGN_DATA .align 2 /* 4 byte alignment, zero filled */ 37#define ALIGN_TEXT .align 2,0x90 /* 4-byte alignment, nop filled */ 38#define SUPERALIGN_TEXT .align 4,0x90 /* 16-byte alignment (better for 486), nop filled */ 39 40#define GEN_ENTRY(name) ALIGN_TEXT; .globl name; name: 41#define NON_GPROF_ENTRY(name) GEN_ENTRY(_/**/name) 42 43/* These three are place holders for future changes to the profiling code */ 44#define MCOUNT_LABEL(name) 45#define MEXITCOUNT 46#define FAKE_MCOUNT(caller) 47 48#ifdef GPROF 49/* 50 * ALTENTRY() must be before a corresponding ENTRY() so that it can jump 51 * over the mcounting. 52 */ 53#define ALTENTRY(name) GEN_ENTRY(_/**/name); MCOUNT; jmp 2f 54#define ENTRY(name) GEN_ENTRY(_/**/name); MCOUNT; 2: 55/* 56 * The call to mcount supports the usual (bad) conventions. We allocate 57 * some data and pass a pointer to it although the FreeBSD doesn't use 58 * the data. We set up a frame before calling mcount because that is 59 * the standard convention although it makes work for both mcount and 60 * callers. 61 */ 62#define MCOUNT .data; ALIGN_DATA; 1:; .long 0; .text; \ 63 pushl %ebp; movl %esp,%ebp; \ 64 movl $1b,%eax; call mcount; popl %ebp 65#else 66/* 67 * ALTENTRY() has to align because it is before a corresponding ENTRY(). 68 * ENTRY() has to align to because there may be no ALTENTRY() before it. 69 * If there is a previous ALTENTRY() then the alignment code is empty. 70 */ 71#define ALTENTRY(name) GEN_ENTRY(_/**/name) 72#define ENTRY(name) GEN_ENTRY(_/**/name) 73#define MCOUNT 74 75#endif 76 77#ifdef DUMMY_NOPS /* this will break some older machines */ 78#define FASTER_NOP 79#define NOP 80#else 81#define FASTER_NOP pushl %eax ; inb $0x84,%al ; popl %eax 82#define NOP pushl %eax ; inb $0x84,%al ; inb $0x84,%al ; popl %eax 83#endif 84 85