239 lines
8.7 KiB
C
239 lines
8.7 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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* 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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#include <sys/cdefs.h>
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/* XXX too much duplication in various asm*.h's. */
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/*
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* CNAME is used to manage the relationship between symbol names in C
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* and the equivalent assembly language names. CNAME is given a name as
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* it would be used in a C program. It expands to the equivalent assembly
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* language name.
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*/
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#define CNAME(csym) csym
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#define ALIGN_DATA .p2align 2 /* 4 byte alignment, zero filled */
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#ifdef GPROF
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#define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
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#else
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#define ALIGN_TEXT .p2align 2,0x90 /* 4-byte alignment, nop filled */
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#endif
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#define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
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#define GEN_ENTRY(name) ALIGN_TEXT; .globl CNAME(name); \
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.type CNAME(name),@function; CNAME(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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#define END(name) .size name, . - name
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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 __mcount 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
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* is 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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#ifdef GUPROF
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#define MEXITCOUNT call .mexitcount
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#define ret MEXITCOUNT ; NON_GPROF_RET
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#else
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#define MEXITCOUNT
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#endif
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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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#ifdef LOCORE
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/*
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* Convenience macro for declaring interrupt entry points.
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*/
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#define IDTVEC(name) ALIGN_TEXT; .globl __CONCAT(X,name); \
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.type __CONCAT(X,name),@function; __CONCAT(X,name):
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/*
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* Macros to create and destroy a trap frame.
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*/
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#define PUSH_FRAME \
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pushl $0 ; /* dummy error code */ \
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pushl $0 ; /* dummy trap type */ \
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pushal ; /* 8 ints */ \
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pushl %ds ; /* save data and extra segments ... */ \
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pushl %es ; \
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pushl %fs
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#define POP_FRAME \
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popl %fs ; \
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popl %es ; \
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popl %ds ; \
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popal ; \
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addl $4+4,%esp
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/*
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* Access per-CPU data.
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*/
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#define PCPU(member) %fs:PC_ ## member
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#define PCPU_ADDR(member, reg) \
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movl %fs:PC_PRVSPACE, reg ; \
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addl $PC_ ## member, reg
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/*
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* Setup the kernel segment registers.
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*/
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#define SET_KERNEL_SREGS \
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movl $KDSEL, %eax ; /* reload with kernel's data segment */ \
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movl %eax, %ds ; \
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movl %eax, %es ; \
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movl $KPSEL, %eax ; /* reload with per-CPU data segment */ \
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movl %eax, %fs
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#ifdef XEN
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#define LOAD_CR3(reg) \
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movl reg,PCPU(CR3); \
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pushl %ecx ; \
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pushl %edx ; \
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pushl %esi ; \
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pushl reg ; \
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call xen_load_cr3 ; \
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addl $4,%esp ; \
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popl %esi ; \
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popl %edx ; \
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popl %ecx ; \
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#define READ_CR3(reg) movl PCPU(CR3),reg;
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#define LLDT(arg) \
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pushl %edx ; \
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pushl %eax ; \
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xorl %eax,%eax ; \
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movl %eax,%gs ; \
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call i386_reset_ldt ; \
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popl %eax ; \
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popl %edx
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#define CLI call ni_cli
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#else
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#define LOAD_CR3(reg) movl reg,%cr3;
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#define READ_CR3(reg) movl %cr3,reg;
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#define LLDT(arg) lldt arg;
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#define CLI cli
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#endif /* !XEN */
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#endif /* LOCORE */
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#ifdef __STDC__
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#define ELFNOTE(name, type, desctype, descdata...) \
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.pushsection .note.name ; \
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.align 4 ; \
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.long 2f - 1f /* namesz */ ; \
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.long 4f - 3f /* descsz */ ; \
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.long type ; \
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1:.asciz #name ; \
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2:.align 4 ; \
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3:desctype descdata ; \
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4:.align 4 ; \
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.popsection
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#else /* !__STDC__, i.e. -traditional */
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#define ELFNOTE(name, type, desctype, descdata) \
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.pushsection .note.name ; \
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.align 4 ; \
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.long 2f - 1f /* namesz */ ; \
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.long 4f - 3f /* descsz */ ; \
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.long type ; \
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1:.asciz "name" ; \
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2:.align 4 ; \
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3:desctype descdata ; \
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4:.align 4 ; \
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.popsection
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#endif /* __STDC__ */
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#endif /* !_MACHINE_ASMACROS_H_ */
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