/*- * Copyright (c) 1993 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $Id: asmacros.h,v 1.7 1996/03/31 04:17:25 bde Exp $ */ #ifndef _MACHINE_ASMACROS_H_ #define _MACHINE_ASMACROS_H_ #ifdef KERNEL #include /* XXX too much duplication in various asm*.h's and gprof.h's */ #define ALIGN_DATA .align 2 /* 4 byte alignment, zero filled */ #define ALIGN_TEXT .align 2,0x90 /* 4-byte alignment, nop filled */ #define SUPERALIGN_TEXT .align 4,0x90 /* 16-byte alignment (better for 486), nop filled */ #define GEN_ENTRY(name) ALIGN_TEXT; .globl __CONCAT(_,name); __CONCAT(_,name): #define NON_GPROF_ENTRY(name) GEN_ENTRY(name) #ifdef GPROF /* * __mcount is like mcount except that doesn't require its caller to set * up a frame pointer. It must be called before pushing anything onto the * stack. gcc should eventually generate code to call __mcount in most * cases. This would make -pg in combination with -fomit-frame-pointer * useful. gcc has a configuration variable PROFILE_BEFORE_PROLOGUE to * allow profiling before setting up the frame pointer, but this is * inadequate for good handling of special cases, e.g., -fpic works best * with profiling after the prologue. * * Neither __mcount nor mcount requires %eax to point to 4 bytes of data, * so don't waste space allocating the data or time setting it up. Changes * to avoid the wastage in gcc-2.4.5-compiled code are available. * * mexitcount is a new profiling feature to allow accurate timing of all * functions if an accurate clock is available. Changes to gcc-2.4.5 to * support it are are available. The changes currently don't allow not * generating mexitcounts for non-kernel code. It is best to call * mexitcount right at the end of a function like the MEXITCOUNT macro * does, but the changes to gcc only implement calling it as the first * thing in the epilogue to avoid problems with -fpic. * * mcount and __mexitcount may clobber the call-used registers and %ef. * mexitcount may clobber %ecx and %ef. * * Cross-jumping makes accurate timing more difficult. It is handled in * many cases by calling mexitcount before jumping. It is not handled * for some conditional jumps (e.g., in bcopyx) or for some fault-handling * jumps. It is handled for some fault-handling jumps by not sharing the * exit routine. * * ALTENTRY() must be before a corresponding ENTRY() so that it can jump to * the main entry point. Note that alt entries are counted twice. They * have to be counted as ordinary entries for gprof to get the call times * right for the ordinary entries. * * High local labels are used in macros to avoid clashes with local labels * in functions. * * "ret" is used instead of "RET" because there are a lot of "ret"s. * 0xc3 is the opcode for "ret" (#define ret ... ret fails because this * file is preprocessed in traditional mode). "ret" clobbers eflags * but this doesn't matter. */ #define ALTENTRY(name) GEN_ENTRY(name) ; MCOUNT ; MEXITCOUNT ; jmp 9f #define ENTRY(name) GEN_ENTRY(name) ; 9: ; MCOUNT #define FAKE_MCOUNT(caller) pushl caller ; call __mcount ; popl %ecx #define MCOUNT call __mcount #define MCOUNT_LABEL(name) GEN_ENTRY(name) ; nop ; ALIGN_TEXT #define MEXITCOUNT call mexitcount #define ret MEXITCOUNT ; .byte 0xc3 #else /* not GPROF */ /* * ALTENTRY() has to align because it is before a corresponding ENTRY(). * ENTRY() has to align to because there may be no ALTENTRY() before it. * If there is a previous ALTENTRY() then the alignment code for ENTRY() * is empty. */ #define ALTENTRY(name) GEN_ENTRY(name) #define ENTRY(name) GEN_ENTRY(name) #define FAKE_MCOUNT(caller) #define MCOUNT #define MCOUNT_LABEL(name) #define MEXITCOUNT #endif /* GPROF */ #else /* !KERNEL */ #include "/usr/src/lib/libc/i386/DEFS.h" /* XXX blech */ #ifndef RCSID #define RCSID(a) #endif #endif /* KERNEL */ #endif /* !_MACHINE_ASMACROS_H_ */