1/* -*- mode: asm -*- */ 2/*- 3 * SPDX-License-Identifier: BSD-3-Clause 4 * 5 * Copyright (c) 1993 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD$ 33 */ 34 35#ifndef _MACHINE_ASMACROS_H_ 36#define _MACHINE_ASMACROS_H_ 37 38#include <sys/cdefs.h> 39 40/* XXX too much duplication in various asm*.h's. */ 41 42/* 43 * CNAME is used to manage the relationship between symbol names in C 44 * and the equivalent assembly language names. CNAME is given a name as 45 * it would be used in a C program. It expands to the equivalent assembly 46 * language name. 47 */ 48#define CNAME(csym) csym 49 50#define ALIGN_DATA .p2align 2 /* 4 byte alignment, zero filled */ 51#ifdef GPROF 52#define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */ 53#else 54#define ALIGN_TEXT .p2align 2,0x90 /* 4-byte alignment, nop filled */ 55#endif 56#define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */ 57 58#define GEN_ENTRY(name) ALIGN_TEXT; .globl CNAME(name); \ 59 .type CNAME(name),@function; CNAME(name): 60#define NON_GPROF_ENTRY(name) GEN_ENTRY(name) 61#define NON_GPROF_RET .byte 0xc3 /* opcode for `ret' */ 62 63#define END(name) .size name, . - name 64 65#ifdef GPROF 66/* 67 * __mcount is like [.]mcount except that doesn't require its caller to set 68 * up a frame pointer. It must be called before pushing anything onto the 69 * stack. gcc should eventually generate code to call __mcount in most 70 * cases. This would make -pg in combination with -fomit-frame-pointer 71 * useful. gcc has a configuration variable PROFILE_BEFORE_PROLOGUE to 72 * allow profiling before setting up the frame pointer, but this is 73 * inadequate for good handling of special cases, e.g., -fpic works best 74 * with profiling after the prologue. 75 * 76 * [.]mexitcount is a new function to support non-statistical profiling if an 77 * accurate clock is available. For C sources, calls to it are generated 78 * by the FreeBSD extension `-mprofiler-epilogue' to gcc. It is best to 79 * call [.]mexitcount at the end of a function like the MEXITCOUNT macro does, 80 * but gcc currently generates calls to it at the start of the epilogue to 81 * avoid problems with -fpic. 82 * 83 * [.]mcount and __mcount may clobber the call-used registers and %ef. 84 * [.]mexitcount may clobber %ecx and %ef. 85 * 86 * Cross-jumping makes non-statistical profiling timing more complicated. 87 * It is handled in many cases by calling [.]mexitcount before jumping. It 88 * is handled for conditional jumps using CROSSJUMP() and CROSSJUMP_LABEL(). 89 * It is handled for some fault-handling jumps by not sharing the exit 90 * routine. 91 * 92 * ALTENTRY() must be before a corresponding ENTRY() so that it can jump to 93 * the main entry point. Note that alt entries are counted twice. They 94 * have to be counted as ordinary entries for gprof to get the call times 95 * right for the ordinary entries. 96 * 97 * High local labels are used in macros to avoid clashes with local labels 98 * in functions. 99 * 100 * Ordinary `ret' is used instead of a macro `RET' because there are a lot 101 * of `ret's. 0xc3 is the opcode for `ret' (`#define ret ... ret' can't 102 * be used because this file is sometimes preprocessed in traditional mode). 103 * `ret' clobbers eflags but this doesn't matter. 104 */ 105#define ALTENTRY(name) GEN_ENTRY(name) ; MCOUNT ; MEXITCOUNT ; jmp 9f 106#define CROSSJUMP(jtrue, label, jfalse) \ 107 jfalse 8f; MEXITCOUNT; jmp __CONCAT(to,label); 8: 108#define CROSSJUMPTARGET(label) \ 109 ALIGN_TEXT; __CONCAT(to,label): ; MCOUNT; jmp label 110#define ENTRY(name) GEN_ENTRY(name) ; 9: ; MCOUNT 111#define FAKE_MCOUNT(caller) pushl caller ; call *__mcountp ; popl %ecx 112#define MCOUNT call *__mcountp 113#define MCOUNT_LABEL(name) GEN_ENTRY(name) ; nop ; ALIGN_TEXT 114#ifdef GUPROF 115#define MEXITCOUNT call *__mexitcountp 116#define ret MEXITCOUNT ; NON_GPROF_RET 117#else 118#define MEXITCOUNT 119#endif 120 121#else /* !GPROF */ 122/* 123 * ALTENTRY() has to align because it is before a corresponding ENTRY(). 124 * ENTRY() has to align to because there may be no ALTENTRY() before it. 125 * If there is a previous ALTENTRY() then the alignment code for ENTRY() 126 * is empty. 127 */ 128#define ALTENTRY(name) GEN_ENTRY(name) 129#define CROSSJUMP(jtrue, label, jfalse) jtrue label 130#define CROSSJUMPTARGET(label) 131#define ENTRY(name) GEN_ENTRY(name) 132#define FAKE_MCOUNT(caller) 133#define MCOUNT 134#define MCOUNT_LABEL(name) 135#define MEXITCOUNT 136#endif /* GPROF */ 137 138#ifdef LOCORE 139 140#define GSEL_KPL 0x0020 /* GSEL(GCODE_SEL, SEL_KPL) */ 141#define SEL_RPL_MASK 0x0003 142 143/* 144 * Convenience macro for declaring interrupt entry points. 145 */ 146#define IDTVEC(name) ALIGN_TEXT; .globl __CONCAT(X,name); \ 147 .type __CONCAT(X,name),@function; __CONCAT(X,name): 148 149/* 150 * Macros to create and destroy a trap frame. 151 */ 152 .macro PUSH_FRAME2 153 pushal 154 pushl $0 155 movw %ds,(%esp) 156 pushl $0 157 movw %es,(%esp) 158 pushl $0 159 movw %fs,(%esp) 160 .endm 161 162 .macro PUSH_FRAME 163 pushl $0 /* dummy error code */ 164 pushl $0 /* dummy trap type */ 165 PUSH_FRAME2 166 .endm 167 168/* 169 * Access per-CPU data. 170 */ 171#define PCPU(member) %fs:PC_ ## member 172 173#define PCPU_ADDR(member, reg) \ 174 movl %fs:PC_PRVSPACE, reg ; \ 175 addl $PC_ ## member, reg 176 177/* 178 * Setup the kernel segment registers. 179 */ 180 .macro SET_KERNEL_SREGS 181 movl $KDSEL, %eax /* reload with kernel's data segment */ 182 movl %eax, %ds 183 movl %eax, %es 184 movl $KPSEL, %eax /* reload with per-CPU data segment */ 185 movl %eax, %fs 186 .endm 187 188 .macro NMOVE_STACKS 189 movl PCPU(KESP0), %edx 190 movl $TF_SZ, %ecx 191 testl $PSL_VM, TF_EFLAGS(%esp) 192 jz .L\@.1 193 addl $VM86_STACK_SPACE, %ecx 194.L\@.1: subl %ecx, %edx 195 movl %edx, %edi 196 movl %esp, %esi 197 rep; movsb 198 movl %edx, %esp 199 .endm 200 201 .macro LOAD_KCR3 202 call .L\@.1 203.L\@.1: popl %eax 204 movl (tramp_idleptd - .L\@.1)(%eax), %eax 205 movl %eax, %cr3 206 .endm 207 208 .macro MOVE_STACKS 209 LOAD_KCR3 210 NMOVE_STACKS 211 .endm 212 213 .macro KENTER 214 testl $PSL_VM, TF_EFLAGS(%esp) 215 jz .L\@.1 216 LOAD_KCR3 217 movl PCPU(CURPCB), %eax 218 testl $PCB_VM86CALL, PCB_FLAGS(%eax) 219 jnz .L\@.3 220 NMOVE_STACKS 221 movl $handle_ibrs_entry,%edx 222 call *%edx 223 jmp .L\@.3 224.L\@.1: testb $SEL_RPL_MASK, TF_CS(%esp) 225 jz .L\@.3 226.L\@.2: MOVE_STACKS 227 movl $handle_ibrs_entry,%edx 228 call *%edx 229.L\@.3: 230 .endm 231 232#endif /* LOCORE */ 233 234#ifdef __STDC__ 235#define ELFNOTE(name, type, desctype, descdata...) \ 236.pushsection .note.name ; \ 237 .align 4 ; \ 238 .long 2f - 1f /* namesz */ ; \ 239 .long 4f - 3f /* descsz */ ; \ 240 .long type ; \ 2411:.asciz #name ; \ 2422:.align 4 ; \ 2433:desctype descdata ; \ 2444:.align 4 ; \ 245.popsection 246#else /* !__STDC__, i.e. -traditional */ 247#define ELFNOTE(name, type, desctype, descdata) \ 248.pushsection .note.name ; \ 249 .align 4 ; \ 250 .long 2f - 1f /* namesz */ ; \ 251 .long 4f - 3f /* descsz */ ; \ 252 .long type ; \ 2531:.asciz "name" ; \ 2542:.align 4 ; \ 2553:desctype descdata ; \ 2564:.align 4 ; \ 257.popsection 258#endif /* __STDC__ */ 259 260#endif /* !_MACHINE_ASMACROS_H_ */ 261