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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: releng/11.2/sys/i386/include/asmacros.h 331722 2018-03-29 02:50:57Z eadler $
   30  */
   31 
   32 #ifndef _MACHINE_ASMACROS_H_
   33 #define _MACHINE_ASMACROS_H_
   34 
   35 #include <sys/cdefs.h>
   36 
   37 /* XXX too much duplication in various asm*.h's. */
   38 
   39 /*
   40  * CNAME is used to manage the relationship between symbol names in C
   41  * and the equivalent assembly language names.  CNAME is given a name as
   42  * it would be used in a C program.  It expands to the equivalent assembly
   43  * language name.
   44  */
   45 #define CNAME(csym)             csym
   46 
   47 #define ALIGN_DATA      .p2align 2      /* 4 byte alignment, zero filled */
   48 #ifdef GPROF
   49 #define ALIGN_TEXT      .p2align 4,0x90 /* 16-byte alignment, nop filled */
   50 #else
   51 #define ALIGN_TEXT      .p2align 2,0x90 /* 4-byte alignment, nop filled */
   52 #endif
   53 #define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
   54 
   55 #define GEN_ENTRY(name)         ALIGN_TEXT; .globl CNAME(name); \
   56                                 .type CNAME(name),@function; CNAME(name):
   57 #define NON_GPROF_ENTRY(name)   GEN_ENTRY(name)
   58 #define NON_GPROF_RET           .byte 0xc3      /* opcode for `ret' */
   59 
   60 #define END(name)               .size name, . - name
   61 
   62 #ifdef GPROF
   63 /*
   64  * __mcount is like [.]mcount except that doesn't require its caller to set
   65  * up a frame pointer.  It must be called before pushing anything onto the
   66  * stack.  gcc should eventually generate code to call __mcount in most
   67  * cases.  This would make -pg in combination with -fomit-frame-pointer
   68  * useful.  gcc has a configuration variable PROFILE_BEFORE_PROLOGUE to
   69  * allow profiling before setting up the frame pointer, but this is
   70  * inadequate for good handling of special cases, e.g., -fpic works best
   71  * with profiling after the prologue.
   72  *
   73  * [.]mexitcount is a new function to support non-statistical profiling if an
   74  * accurate clock is available.  For C sources, calls to it are generated
   75  * by the FreeBSD extension `-mprofiler-epilogue' to gcc.  It is best to
   76  * call [.]mexitcount at the end of a function like the MEXITCOUNT macro does,
   77  * but gcc currently generates calls to it at the start of the epilogue to
   78  * avoid problems with -fpic.
   79  *
   80  * [.]mcount and __mcount may clobber the call-used registers and %ef.
   81  * [.]mexitcount may clobber %ecx and %ef.
   82  *
   83  * Cross-jumping makes non-statistical profiling timing more complicated.
   84  * It is handled in many cases by calling [.]mexitcount before jumping.  It
   85  * is handled for conditional jumps using CROSSJUMP() and CROSSJUMP_LABEL().
   86  * It is handled for some fault-handling jumps by not sharing the exit
   87  * routine.
   88  *
   89  * ALTENTRY() must be before a corresponding ENTRY() so that it can jump to
   90  * the main entry point.  Note that alt entries are counted twice.  They
   91  * have to be counted as ordinary entries for gprof to get the call times
   92  * right for the ordinary entries.
   93  *
   94  * High local labels are used in macros to avoid clashes with local labels
   95  * in functions.
   96  *
   97  * Ordinary `ret' is used instead of a macro `RET' because there are a lot
   98  * of `ret's.  0xc3 is the opcode for `ret' (`#define ret ... ret' can't
   99  * be used because this file is sometimes preprocessed in traditional mode).
  100  * `ret' clobbers eflags but this doesn't matter.
  101  */
  102 #define ALTENTRY(name)          GEN_ENTRY(name) ; MCOUNT ; MEXITCOUNT ; jmp 9f
  103 #define CROSSJUMP(jtrue, label, jfalse) \
  104         jfalse 8f; MEXITCOUNT; jmp __CONCAT(to,label); 8:
  105 #define CROSSJUMPTARGET(label) \
  106         ALIGN_TEXT; __CONCAT(to,label): ; MCOUNT; jmp label
  107 #define ENTRY(name)             GEN_ENTRY(name) ; 9: ; MCOUNT
  108 #define FAKE_MCOUNT(caller)     pushl caller ; call __mcount ; popl %ecx
  109 #define MCOUNT                  call __mcount
  110 #define MCOUNT_LABEL(name)      GEN_ENTRY(name) ; nop ; ALIGN_TEXT
  111 #ifdef GUPROF
  112 #define MEXITCOUNT              call .mexitcount
  113 #define ret                     MEXITCOUNT ; NON_GPROF_RET
  114 #else
  115 #define MEXITCOUNT
  116 #endif
  117 
  118 #else /* !GPROF */
  119 /*
  120  * ALTENTRY() has to align because it is before a corresponding ENTRY().
  121  * ENTRY() has to align to because there may be no ALTENTRY() before it.
  122  * If there is a previous ALTENTRY() then the alignment code for ENTRY()
  123  * is empty.
  124  */
  125 #define ALTENTRY(name)          GEN_ENTRY(name)
  126 #define CROSSJUMP(jtrue, label, jfalse) jtrue label
  127 #define CROSSJUMPTARGET(label)
  128 #define ENTRY(name)             GEN_ENTRY(name)
  129 #define FAKE_MCOUNT(caller)
  130 #define MCOUNT
  131 #define MCOUNT_LABEL(name)
  132 #define MEXITCOUNT
  133 #endif /* GPROF */
  134 
  135 #ifdef LOCORE
  136 /*
  137  * Convenience macro for declaring interrupt entry points.
  138  */
  139 #define IDTVEC(name)    ALIGN_TEXT; .globl __CONCAT(X,name); \
  140                         .type __CONCAT(X,name),@function; __CONCAT(X,name):
  141 
  142 /*
  143  * Macros to create and destroy a trap frame.
  144  */
  145 #define PUSH_FRAME                                                      \
  146         pushl   $0 ;            /* dummy error code */                  \
  147         pushl   $0 ;            /* dummy trap type */                   \
  148         pushal ;                /* 8 ints */                            \
  149         pushl   $0 ;            /* save data and extra segments ... */  \
  150         movw    %ds,(%esp) ;                                            \
  151         pushl   $0 ;                                                    \
  152         movw    %es,(%esp) ;                                            \
  153         pushl   $0 ;                                                    \
  154         movw    %fs,(%esp)
  155         
  156 /*
  157  * Access per-CPU data.
  158  */
  159 #define PCPU(member)    %fs:PC_ ## member
  160 
  161 #define PCPU_ADDR(member, reg)                                          \
  162         movl %fs:PC_PRVSPACE, reg ;                                     \
  163         addl $PC_ ## member, reg
  164 
  165 /*
  166  * Setup the kernel segment registers.
  167  */
  168 #define SET_KERNEL_SREGS                                                \
  169         movl    $KDSEL, %eax ;  /* reload with kernel's data segment */ \
  170         movl    %eax, %ds ;                                             \
  171         movl    %eax, %es ;                                             \
  172         movl    $KPSEL, %eax ;  /* reload with per-CPU data segment */  \
  173         movl    %eax, %fs
  174 
  175 #endif /* LOCORE */
  176 
  177 #ifdef __STDC__
  178 #define ELFNOTE(name, type, desctype, descdata...) \
  179 .pushsection .note.name                 ;       \
  180   .align 4                              ;       \
  181   .long 2f - 1f         /* namesz */    ;       \
  182   .long 4f - 3f         /* descsz */    ;       \
  183   .long type                            ;       \
  184 1:.asciz #name                          ;       \
  185 2:.align 4                              ;       \
  186 3:desctype descdata                     ;       \
  187 4:.align 4                              ;       \
  188 .popsection
  189 #else /* !__STDC__, i.e. -traditional */
  190 #define ELFNOTE(name, type, desctype, descdata) \
  191 .pushsection .note.name                 ;       \
  192   .align 4                              ;       \
  193   .long 2f - 1f         /* namesz */    ;       \
  194   .long 4f - 3f         /* descsz */    ;       \
  195   .long type                            ;       \
  196 1:.asciz "name"                         ;       \
  197 2:.align 4                              ;       \
  198 3:desctype descdata                     ;       \
  199 4:.align 4                              ;       \
  200 .popsection
  201 #endif /* __STDC__ */
  202 
  203 #endif /* !_MACHINE_ASMACROS_H_ */

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