214 lines
7.6 KiB
C
214 lines
7.6 KiB
C
/*-
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* Copyright (c) 1993 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_ASMACROS_H_
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#define _MACHINE_ASMACROS_H_
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#ifdef KERNEL
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#include <sys/cdefs.h>
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/* XXX too much duplication in various asm*.h's. */
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#define ALIGN_DATA .align 2 /* 4 byte alignment, zero filled */
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#ifdef GPROF
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#define ALIGN_TEXT .align 4,0x90 /* 16-byte alignment, nop filled */
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#else
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#define ALIGN_TEXT .align 2,0x90 /* 4-byte alignment, nop filled */
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#endif
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#define SUPERALIGN_TEXT .align 4,0x90 /* 16-byte alignment, nop filled */
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#define GEN_ENTRY(name) ALIGN_TEXT; .globl __CONCAT(_,name); \
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__CONCAT(_,name):
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#define NON_GPROF_ENTRY(name) GEN_ENTRY(name)
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#define NON_GPROF_RET .byte 0xc3 /* opcode for `ret' */
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#ifdef GPROF
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/*
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* __mcount is like mcount except that doesn't require its caller to set
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* up a frame pointer. It must be called before pushing anything onto the
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* stack. gcc should eventually generate code to call __mcount in most
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* cases. This would make -pg in combination with -fomit-frame-pointer
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* useful. gcc has a configuration variable PROFILE_BEFORE_PROLOGUE to
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* allow profiling before setting up the frame pointer, but this is
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* inadequate for good handling of special cases, e.g., -fpic works best
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* with profiling after the prologue.
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*
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* mexitcount is a new function to support non-statistical profiling if an
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* accurate clock is available. For C sources, calls to it are generated
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* by the FreeBSD extension `-mprofiler-epilogue' to gcc. It is best to
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* call mexitcount at the end of a function like the MEXITCOUNT macro does,
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* but gcc currently generates calls to it at the start of the epilogue to
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* avoid problems with -fpic.
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*
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* mcount and __mexitcount may clobber the call-used registers and %ef.
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* mexitcount may clobber %ecx and %ef.
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*
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* Cross-jumping makes non-statistical profiling timing more complicated.
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* It is handled in many cases by calling mexitcount before jumping. It is
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* handled for conditional jumps using CROSSJUMP() and CROSSJUMP_LABEL().
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* It is handled for some fault-handling jumps by not sharing the exit
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* routine.
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*
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* ALTENTRY() must be before a corresponding ENTRY() so that it can jump to
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* the main entry point. Note that alt entries are counted twice. They
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* have to be counted as ordinary entries for gprof to get the call times
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* right for the ordinary entries.
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*
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* High local labels are used in macros to avoid clashes with local labels
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* in functions.
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*
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* Ordinary `ret' is used instead of a macro `RET' because there are a lot
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* of `ret's. 0xc3 is the opcode for `ret' (`#define ret ... ret' can't
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* be used because this file is sometimes preprocessed in traditional mode).
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* `ret' clobbers eflags but this doesn't matter.
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*/
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#define ALTENTRY(name) GEN_ENTRY(name) ; MCOUNT ; MEXITCOUNT ; jmp 9f
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#define CROSSJUMP(jtrue, label, jfalse) \
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jfalse 8f; MEXITCOUNT; jmp __CONCAT(to,label); 8:
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#define CROSSJUMPTARGET(label) \
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ALIGN_TEXT; __CONCAT(to,label): ; MCOUNT; jmp label
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#define ENTRY(name) GEN_ENTRY(name) ; 9: ; MCOUNT
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#define FAKE_MCOUNT(caller) pushl caller ; call __mcount ; popl %ecx
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#define MCOUNT call __mcount
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#define MCOUNT_LABEL(name) GEN_ENTRY(name) ; nop ; ALIGN_TEXT
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#define MEXITCOUNT call mexitcount
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#define ret MEXITCOUNT ; NON_GPROF_RET
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#else /* !GPROF */
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/*
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* ALTENTRY() has to align because it is before a corresponding ENTRY().
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* ENTRY() has to align to because there may be no ALTENTRY() before it.
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* If there is a previous ALTENTRY() then the alignment code for ENTRY()
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* is empty.
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*/
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#define ALTENTRY(name) GEN_ENTRY(name)
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#define CROSSJUMP(jtrue, label, jfalse) jtrue label
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#define CROSSJUMPTARGET(label)
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#define ENTRY(name) GEN_ENTRY(name)
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#define FAKE_MCOUNT(caller)
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#define MCOUNT
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#define MCOUNT_LABEL(name)
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#define MEXITCOUNT
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#endif /* GPROF */
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#else /* !KERNEL */
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#include "/usr/src/lib/libc/i386/DEFS.h" /* XXX blech */
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/*
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* In the !KERNEL case, this header is only (ab)used in lib/msun/i387.
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* Use it to generate code to select between the generic math functions
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* and the i387 ones.
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*/
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#undef ENTRY
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#define ANAME(x) CNAME(__CONCAT(__i387_,x))
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#define ASELNAME(x) CNAME(__CONCAT(__arch_select_,x))
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#define AVECNAME(x) CNAME(__CONCAT(__arch_,x))
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#define GNAME(x) CNAME(__CONCAT(__generic_,x))
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/* Don't bother profiling this. */
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#ifdef PIC
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#define ARCH_DISPATCH(x) \
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_START_ENTRY; \
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.globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \
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PIC_PROLOGUE; \
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movl PIC_GOT(AVECNAME(x)),%eax; \
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PIC_EPILOGUE; \
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jmpl *(%eax)
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#define ARCH_SELECT(x) _START_ENTRY; \
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.type ASELNAME(x),@function; \
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ASELNAME(x): \
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PIC_PROLOGUE; \
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call PIC_PLT(CNAME(__get_hw_float)); \
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testl %eax,%eax; \
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movl PIC_GOT(ANAME(x)),%eax; \
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jne 8f; \
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movl PIC_GOT(GNAME(x)),%eax; \
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8: \
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movl PIC_GOT(AVECNAME(x)),%edx; \
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movl %eax,(%edx); \
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PIC_EPILOGUE; \
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jmpl *%eax
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#else /* !PIC */
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#define ARCH_DISPATCH(x) \
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_START_ENTRY; \
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.globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \
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jmpl *AVECNAME(x)
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#define ARCH_SELECT(x) _START_ENTRY; \
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.type ASELNAME(x),@function; \
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ASELNAME(x): \
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call CNAME(__get_hw_float); \
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testl %eax,%eax; \
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movl $ANAME(x),%eax; \
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jne 8f; \
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movl $GNAME(x),%eax; \
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8: \
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movl %eax,AVECNAME(x); \
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jmpl *%eax
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#endif /* PIC */
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#define ARCH_VECTOR(x) .data; .align 2; \
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.globl AVECNAME(x); \
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.type AVECNAME(x),@object; \
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.size AVECNAME(x),4; \
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AVECNAME(x): .long ASELNAME(x)
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#ifdef PROF
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#define ALTENTRY(x) ENTRY(x); jmp 9f
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#define ENTRY(x) ARCH_VECTOR(x); ARCH_SELECT(x); ARCH_DISPATCH(x); \
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_START_ENTRY; \
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.globl ANAME(x); .type ANAME(x),@function; ANAME(x):; \
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call HIDENAME(mcount); 9:
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#else /* !PROF */
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#define ALTENTRY(x) ENTRY(x)
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#define ENTRY(x) ARCH_VECTOR(x); ARCH_SELECT(x); ARCH_DISPATCH(x); \
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_START_ENTRY; \
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.globl ANAME(x); .type ANAME(x),@function; ANAME(x):
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#endif /* PROF */
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#ifndef RCSID
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#define RCSID(a)
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#endif
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#endif /* KERNEL */
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#endif /* !_MACHINE_ASMACROS_H_ */
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