Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/asmacros.h
Version:
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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 #define ALIGN_TEXT .p2align 2,0x90 /* 4-byte alignment, nop filled */ 52 #define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */ 53 54 #define GEN_ENTRY(name) ALIGN_TEXT; .globl CNAME(name); \ 55 .type CNAME(name),@function; CNAME(name): 56 #define ENTRY(name) GEN_ENTRY(name) 57 #define ALTENTRY(name) GEN_ENTRY(name) 58 #define END(name) .size name, . - name 59 60 #ifdef LOCORE 61 62 #define GSEL_KPL 0x0020 /* GSEL(GCODE_SEL, SEL_KPL) */ 63 #define SEL_RPL_MASK 0x0003 64 65 /* 66 * Convenience macro for declaring interrupt entry points. 67 */ 68 #define IDTVEC(name) ALIGN_TEXT; .globl __CONCAT(X,name); \ 69 .type __CONCAT(X,name),@function; __CONCAT(X,name): 70 71 /* 72 * Macros to create and destroy a trap frame. 73 */ 74 .macro PUSH_FRAME2 75 pushal 76 pushl $0 77 movw %ds,(%esp) 78 pushl $0 79 movw %es,(%esp) 80 pushl $0 81 movw %fs,(%esp) 82 movl %esp,%ebp 83 .endm 84 85 .macro PUSH_FRAME 86 pushl $0 /* dummy error code */ 87 pushl $0 /* dummy trap type */ 88 PUSH_FRAME2 89 .endm 90 91 /* 92 * Access per-CPU data. 93 */ 94 #define PCPU(member) %fs:PC_ ## member 95 96 #define PCPU_ADDR(member, reg) \ 97 movl %fs:PC_PRVSPACE, reg ; \ 98 addl $PC_ ## member, reg 99 100 /* 101 * Setup the kernel segment registers. 102 */ 103 .macro SET_KERNEL_SREGS 104 movl $KDSEL, %eax /* reload with kernel's data segment */ 105 movl %eax, %ds 106 movl %eax, %es 107 movl $KPSEL, %eax /* reload with per-CPU data segment */ 108 movl %eax, %fs 109 .endm 110 111 .macro NMOVE_STACKS 112 movl PCPU(KESP0), %edx 113 movl $TF_SZ, %ecx 114 testl $PSL_VM, TF_EFLAGS(%esp) 115 jz .L\@.1 116 addl $VM86_STACK_SPACE, %ecx 117 .L\@.1: subl %ecx, %edx 118 movl %edx, %edi 119 movl %esp, %esi 120 rep; movsb 121 movl %edx, %esp 122 .endm 123 124 .macro LOAD_KCR3 125 call .L\@.1 126 .L\@.1: popl %eax 127 movl (tramp_idleptd - .L\@.1)(%eax), %eax 128 movl %eax, %cr3 129 .endm 130 131 .macro MOVE_STACKS 132 LOAD_KCR3 133 NMOVE_STACKS 134 .endm 135 136 .macro KENTER 137 testl $PSL_VM, TF_EFLAGS(%esp) 138 jz .L\@.1 139 LOAD_KCR3 140 movl PCPU(CURPCB), %eax 141 testl $PCB_VM86CALL, PCB_FLAGS(%eax) 142 jnz .L\@.3 143 NMOVE_STACKS 144 movl $handle_ibrs_entry,%edx 145 call *%edx 146 jmp .L\@.3 147 .L\@.1: testb $SEL_RPL_MASK, TF_CS(%esp) 148 jz .L\@.3 149 .L\@.2: MOVE_STACKS 150 movl $handle_ibrs_entry,%edx 151 call *%edx 152 .L\@.3: 153 .endm 154 155 #endif /* LOCORE */ 156 157 #ifdef __STDC__ 158 #define ELFNOTE(name, type, desctype, descdata...) \ 159 .pushsection .note.name, "a", @note ; \ 160 .align 4 ; \ 161 .long 2f - 1f /* namesz */ ; \ 162 .long 4f - 3f /* descsz */ ; \ 163 .long type ; \ 164 1:.asciz #name ; \ 165 2:.align 4 ; \ 166 3:desctype descdata ; \ 167 4:.align 4 ; \ 168 .popsection 169 #else /* !__STDC__, i.e. -traditional */ 170 #define ELFNOTE(name, type, desctype, descdata) \ 171 .pushsection .note.name, "a", @note ; \ 172 .align 4 ; \ 173 .long 2f - 1f /* namesz */ ; \ 174 .long 4f - 3f /* descsz */ ; \ 175 .long type ; \ 176 1:.asciz "name" ; \ 177 2:.align 4 ; \ 178 3:desctype descdata ; \ 179 4:.align 4 ; \ 180 .popsection 181 #endif /* __STDC__ */ 182 183 #endif /* !_MACHINE_ASMACROS_H_ */
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