| /*- |
| * 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: src/sys/i386/include/asmacros.h,v 1.31.2.1.2.1 2009/10/25 01:10:29 kensmith Exp $ |
| */ |
| |
| #ifndef _BSD_MACHINE_ASMACROS_H_ |
| #define _BSD_MACHINE_ASMACROS_H_ |
| |
| #include <sys/bsd_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 %ds ; /* save data and extra segments ... */ \ |
| pushl %es ; \ |
| pushl %fs |
| |
| #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_FREEBSD_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 |
| |
| #ifdef XEN |
| #define LOAD_CR3(reg) \ |
| movl reg,PCPU(CR3); \ |
| pushl %ecx ; \ |
| pushl %edx ; \ |
| pushl %esi ; \ |
| pushl reg ; \ |
| call xen_load_cr3 ; \ |
| addl $4,%esp ; \ |
| popl %esi ; \ |
| popl %edx ; \ |
| popl %ecx ; \ |
| |
| #define READ_CR3(reg) movl PCPU(CR3),reg; |
| #define LLDT(arg) \ |
| pushl %edx ; \ |
| pushl %eax ; \ |
| xorl %eax,%eax ; \ |
| movl %eax,%gs ; \ |
| call i386_reset_ldt ; \ |
| popl %eax ; \ |
| popl %edx |
| #define CLI call ni_cli |
| #else |
| #define LOAD_CR3(reg) movl reg,%cr3; |
| #define READ_CR3(reg) movl %cr3,reg; |
| #define LLDT(arg) lldt arg; |
| #define CLI cli |
| #endif /* !XEN */ |
| |
| |
| #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 /* !_BSD_MACHINE_ASMACROS_H_ */ |
