The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/asmacros.h

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    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  * $FreeBSD: src/sys/i386/include/asmacros.h,v 1.9.2.8 1999/09/05 08:11:38 peter Exp $
   34  */
   35 
   36 #ifndef _MACHINE_ASMACROS_H_
   37 #define _MACHINE_ASMACROS_H_
   38 
   39 #include <sys/cdefs.h>
   40 
   41 /* XXX too much duplication in various asm*.h's. */
   42 
   43 /*
   44  * CNAME and HIDENAME manage the relationship between symbol names in C
   45  * and the equivalent assembly language names.  CNAME is given a name as
   46  * it would be used in a C program.  It expands to the equivalent assembly
   47  * language name.  HIDENAME is given an assembly-language name, and expands
   48  * to a possibly-modified form that will be invisible to C programs.
   49  */
   50 #if defined(__ELF__)
   51 #define CNAME(csym)             csym
   52 #define HIDENAME(asmsym)        __CONCAT(.,asmsym)
   53 #else
   54 #define CNAME(csym)             __CONCAT(_,csym)
   55 #define HIDENAME(asmsym)        asmsym
   56 #endif
   57 
   58 #define ALIGN_DATA      .p2align 2      /* 4 byte alignment, zero filled */
   59 #ifdef GPROF
   60 #define ALIGN_TEXT      .p2align 4,0x90 /* 16-byte alignment, nop filled */
   61 #else
   62 #define ALIGN_TEXT      .p2align 2,0x90 /* 4-byte alignment, nop filled */
   63 #endif
   64 #define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
   65 
   66 #define GEN_ENTRY(name)         ALIGN_TEXT; .globl CNAME(name); \
   67                                 CNAME(name):
   68 #define NON_GPROF_ENTRY(name)   GEN_ENTRY(name)
   69 #define NON_GPROF_RET           .byte 0xc3      /* opcode for `ret' */
   70 
   71 #ifdef GPROF
   72 /*
   73  * __mcount is like mcount except that doesn't require its caller to set
   74  * up a frame pointer.  It must be called before pushing anything onto the
   75  * stack.  gcc should eventually generate code to call __mcount in most
   76  * cases.  This would make -pg in combination with -fomit-frame-pointer
   77  * useful.  gcc has a configuration variable PROFILE_BEFORE_PROLOGUE to
   78  * allow profiling before setting up the frame pointer, but this is
   79  * inadequate for good handling of special cases, e.g., -fpic works best
   80  * with profiling after the prologue.
   81  *
   82  * mexitcount is a new function to support non-statistical profiling if an
   83  * accurate clock is available.  For C sources, calls to it are generated
   84  * by the FreeBSD extension `-mprofiler-epilogue' to gcc.  It is best to
   85  * call mexitcount at the end of a function like the MEXITCOUNT macro does,
   86  * but gcc currently generates calls to it at the start of the epilogue to
   87  * avoid problems with -fpic.
   88  *
   89  * mcount and __mexitcount may clobber the call-used registers and %ef.
   90  * mexitcount may clobber %ecx and %ef.
   91  *
   92  * Cross-jumping makes non-statistical profiling timing more complicated.
   93  * It is handled in many cases by calling mexitcount before jumping.  It is
   94  * handled for conditional jumps using CROSSJUMP() and CROSSJUMP_LABEL().
   95  * It is handled for some fault-handling jumps by not sharing the exit
   96  * routine.
   97  *
   98  * ALTENTRY() must be before a corresponding ENTRY() so that it can jump to
   99  * the main entry point.  Note that alt entries are counted twice.  They
  100  * have to be counted as ordinary entries for gprof to get the call times
  101  * right for the ordinary entries.
  102  *
  103  * High local labels are used in macros to avoid clashes with local labels
  104  * in functions.
  105  *
  106  * Ordinary `ret' is used instead of a macro `RET' because there are a lot
  107  * of `ret's.  0xc3 is the opcode for `ret' (`#define ret ... ret' can't
  108  * be used because this file is sometimes preprocessed in traditional mode).
  109  * `ret' clobbers eflags but this doesn't matter.
  110  */
  111 #define ALTENTRY(name)          GEN_ENTRY(name) ; MCOUNT ; MEXITCOUNT ; jmp 9f
  112 #define CROSSJUMP(jtrue, label, jfalse) \
  113         jfalse 8f; MEXITCOUNT; jmp __CONCAT(to,label); 8:
  114 #define CROSSJUMPTARGET(label) \
  115         ALIGN_TEXT; __CONCAT(to,label): ; MCOUNT; jmp label
  116 #define ENTRY(name)             GEN_ENTRY(name) ; 9: ; MCOUNT
  117 #define FAKE_MCOUNT(caller)     pushl caller ; call __mcount ; popl %ecx
  118 #define MCOUNT                  call __mcount
  119 #define MCOUNT_LABEL(name)      GEN_ENTRY(name) ; nop ; ALIGN_TEXT
  120 #define MEXITCOUNT              call mexitcount
  121 #define ret                     MEXITCOUNT ; NON_GPROF_RET
  122 
  123 #else /* !GPROF */
  124 /*
  125  * ALTENTRY() has to align because it is before a corresponding ENTRY().
  126  * ENTRY() has to align to because there may be no ALTENTRY() before it.
  127  * If there is a previous ALTENTRY() then the alignment code for ENTRY()
  128  * is empty.
  129  */
  130 #define ALTENTRY(name)          GEN_ENTRY(name)
  131 #define CROSSJUMP(jtrue, label, jfalse) jtrue label
  132 #define CROSSJUMPTARGET(label)
  133 #define ENTRY(name)             GEN_ENTRY(name)
  134 #define FAKE_MCOUNT(caller)
  135 #define MCOUNT
  136 #define MCOUNT_LABEL(name)
  137 #define MEXITCOUNT
  138 #endif /* GPROF */
  139 
  140 #endif /* !_MACHINE_ASMACROS_H_ */

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