9f9d9cf33e
trapframes are cleared by explicitly pushing a zero and then moving the segment register into the low 16 bits. Certain Intel processors treat a push of a segment register as a move of the segment register into the low 16 bits leaving the upper 16 bits of the word in the stack unchanged. Reviewed by: kib MFC after: 1 month
211 lines
7.8 KiB
C
211 lines
7.8 KiB
C
/*-
|
|
* 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.
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _MACHINE_ASMACROS_H_
|
|
#define _MACHINE_ASMACROS_H_
|
|
|
|
#include <sys/cdefs.h>
|
|
|
|
/* XXX too much duplication in various asm*.h's. */
|
|
|
|
/*
|
|
* CNAME is used to manage the relationship between symbol names in C
|
|
* and the equivalent assembly language names. CNAME is given a name as
|
|
* it would be used in a C program. It expands to the equivalent assembly
|
|
* language name.
|
|
*/
|
|
#define CNAME(csym) csym
|
|
|
|
#define ALIGN_DATA .p2align 2 /* 4 byte alignment, zero filled */
|
|
#ifdef GPROF
|
|
#define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
|
|
#else
|
|
#define ALIGN_TEXT .p2align 2,0x90 /* 4-byte alignment, nop filled */
|
|
#endif
|
|
#define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
|
|
|
|
#define GEN_ENTRY(name) ALIGN_TEXT; .globl CNAME(name); \
|
|
.type CNAME(name),@function; CNAME(name):
|
|
#define NON_GPROF_ENTRY(name) GEN_ENTRY(name)
|
|
#define NON_GPROF_RET .byte 0xc3 /* opcode for `ret' */
|
|
|
|
#define END(name) .size name, . - 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.
|
|
*
|
|
* [.]mexitcount is a new function to support non-statistical profiling if an
|
|
* accurate clock is available. For C sources, calls to it are generated
|
|
* by the FreeBSD extension `-mprofiler-epilogue' to gcc. It is best to
|
|
* call [.]mexitcount at the end of a function like the MEXITCOUNT macro does,
|
|
* but gcc currently generates calls to it at the start of the epilogue to
|
|
* avoid problems with -fpic.
|
|
*
|
|
* [.]mcount and __mcount may clobber the call-used registers and %ef.
|
|
* [.]mexitcount may clobber %ecx and %ef.
|
|
*
|
|
* Cross-jumping makes non-statistical profiling timing more complicated.
|
|
* It is handled in many cases by calling [.]mexitcount before jumping. It
|
|
* is handled for conditional jumps using CROSSJUMP() and CROSSJUMP_LABEL().
|
|
* 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.
|
|
*
|
|
* Ordinary `ret' is used instead of a macro `RET' because there are a lot
|
|
* of `ret's. 0xc3 is the opcode for `ret' (`#define ret ... ret' can't
|
|
* be used because this file is sometimes preprocessed in traditional mode).
|
|
* `ret' clobbers eflags but this doesn't matter.
|
|
*/
|
|
#define ALTENTRY(name) GEN_ENTRY(name) ; MCOUNT ; MEXITCOUNT ; jmp 9f
|
|
#define CROSSJUMP(jtrue, label, jfalse) \
|
|
jfalse 8f; MEXITCOUNT; jmp __CONCAT(to,label); 8:
|
|
#define CROSSJUMPTARGET(label) \
|
|
ALIGN_TEXT; __CONCAT(to,label): ; MCOUNT; jmp label
|
|
#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
|
|
#ifdef GUPROF
|
|
#define MEXITCOUNT call .mexitcount
|
|
#define ret MEXITCOUNT ; NON_GPROF_RET
|
|
#else
|
|
#define MEXITCOUNT
|
|
#endif
|
|
|
|
#else /* !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 CROSSJUMP(jtrue, label, jfalse) jtrue label
|
|
#define CROSSJUMPTARGET(label)
|
|
#define ENTRY(name) GEN_ENTRY(name)
|
|
#define FAKE_MCOUNT(caller)
|
|
#define MCOUNT
|
|
#define MCOUNT_LABEL(name)
|
|
#define MEXITCOUNT
|
|
#endif /* GPROF */
|
|
|
|
#ifdef LOCORE
|
|
/*
|
|
* Convenience macro for declaring interrupt entry points.
|
|
*/
|
|
#define IDTVEC(name) ALIGN_TEXT; .globl __CONCAT(X,name); \
|
|
.type __CONCAT(X,name),@function; __CONCAT(X,name):
|
|
|
|
/*
|
|
* Macros to create and destroy a trap frame.
|
|
*/
|
|
#define PUSH_FRAME \
|
|
pushl $0 ; /* dummy error code */ \
|
|
pushl $0 ; /* dummy trap type */ \
|
|
pushal ; /* 8 ints */ \
|
|
pushl $0 ; /* save data and extra segments ... */ \
|
|
mov %ds,(%esp) ; \
|
|
pushl $0 ; \
|
|
mov %es,(%esp) ; \
|
|
pushl $0 ; \
|
|
mov %fs,(%esp)
|
|
|
|
#define POP_FRAME \
|
|
popl %fs ; \
|
|
popl %es ; \
|
|
popl %ds ; \
|
|
popal ; \
|
|
addl $4+4,%esp
|
|
|
|
/*
|
|
* Access per-CPU data.
|
|
*/
|
|
#define PCPU(member) %fs:PC_ ## member
|
|
|
|
#define PCPU_ADDR(member, reg) \
|
|
movl %fs:PC_PRVSPACE, reg ; \
|
|
addl $PC_ ## member, reg
|
|
|
|
/*
|
|
* Setup the kernel segment registers.
|
|
*/
|
|
#define SET_KERNEL_SREGS \
|
|
movl $KDSEL, %eax ; /* reload with kernel's data segment */ \
|
|
movl %eax, %ds ; \
|
|
movl %eax, %es ; \
|
|
movl $KPSEL, %eax ; /* reload with per-CPU data segment */ \
|
|
movl %eax, %fs
|
|
|
|
#endif /* LOCORE */
|
|
|
|
#ifdef __STDC__
|
|
#define ELFNOTE(name, type, desctype, descdata...) \
|
|
.pushsection .note.name ; \
|
|
.align 4 ; \
|
|
.long 2f - 1f /* namesz */ ; \
|
|
.long 4f - 3f /* descsz */ ; \
|
|
.long type ; \
|
|
1:.asciz #name ; \
|
|
2:.align 4 ; \
|
|
3:desctype descdata ; \
|
|
4:.align 4 ; \
|
|
.popsection
|
|
#else /* !__STDC__, i.e. -traditional */
|
|
#define ELFNOTE(name, type, desctype, descdata) \
|
|
.pushsection .note.name ; \
|
|
.align 4 ; \
|
|
.long 2f - 1f /* namesz */ ; \
|
|
.long 4f - 3f /* descsz */ ; \
|
|
.long type ; \
|
|
1:.asciz "name" ; \
|
|
2:.align 4 ; \
|
|
3:desctype descdata ; \
|
|
4:.align 4 ; \
|
|
.popsection
|
|
#endif /* __STDC__ */
|
|
|
|
#endif /* !_MACHINE_ASMACROS_H_ */
|