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 33 #ifndef _MACHINE_ASMACROS_H_ 34 #define _MACHINE_ASMACROS_H_ 35 36 #include <sys/cdefs.h> 37 38 /* XXX too much duplication in various asm*.h's. */ 39 40 /* 41 * CNAME is used to manage the relationship between symbol names in C 42 * and the equivalent assembly language names. CNAME is given a name as 43 * it would be used in a C program. It expands to the equivalent assembly 44 * language name. 45 */ 46 #define CNAME(csym) csym 47 48 #define ALIGN_DATA .p2align 2 /* 4 byte alignment, zero filled */ 49 #define ALIGN_TEXT .p2align 2,0x90 /* 4-byte alignment, nop filled */ 50 #define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */ 51 52 #define GEN_ENTRY(name) ALIGN_TEXT; .globl CNAME(name); \ 53 .type CNAME(name),@function; CNAME(name): 54 #define ENTRY(name) GEN_ENTRY(name) 55 #define ALTENTRY(name) GEN_ENTRY(name) 56 #define END(name) .size name, . - name 57 58 #ifdef LOCORE 59 60 #define GSEL_KPL 0x0020 /* GSEL(GCODE_SEL, SEL_KPL) */ 61 #define SEL_RPL_MASK 0x0003 62 63 /* 64 * Convenience macro for declaring interrupt entry points. 65 */ 66 #define IDTVEC(name) ALIGN_TEXT; .globl __CONCAT(X,name); \ 67 .type __CONCAT(X,name),@function; __CONCAT(X,name): 68 69 /* 70 * Macros to create and destroy a trap frame. 71 */ 72 .macro PUSH_FRAME2 73 pushal 74 pushl $0 75 movw %ds,(%esp) 76 pushl $0 77 movw %es,(%esp) 78 pushl $0 79 movw %fs,(%esp) 80 movl %esp,%ebp 81 .endm 82 83 .macro PUSH_FRAME 84 pushl $0 /* dummy error code */ 85 pushl $0 /* dummy trap type */ 86 PUSH_FRAME2 87 .endm 88 89 /* 90 * Access per-CPU data. 91 */ 92 #define PCPU(member) %fs:PC_ ## member 93 94 #define PCPU_ADDR(member, reg) \ 95 movl %fs:PC_PRVSPACE, reg ; \ 96 addl $PC_ ## member, reg 97 98 /* 99 * Setup the kernel segment registers. 100 */ 101 .macro SET_KERNEL_SREGS 102 movl $KDSEL, %eax /* reload with kernel's data segment */ 103 movl %eax, %ds 104 movl %eax, %es 105 movl $KPSEL, %eax /* reload with per-CPU data segment */ 106 movl %eax, %fs 107 .endm 108 109 .macro NMOVE_STACKS 110 movl PCPU(KESP0), %edx 111 movl $TF_SZ, %ecx 112 testl $PSL_VM, TF_EFLAGS(%esp) 113 jz .L\@.1 114 addl $VM86_STACK_SPACE, %ecx 115 .L\@.1: subl %ecx, %edx 116 movl %edx, %edi 117 movl %esp, %esi 118 rep; movsb 119 movl %edx, %esp 120 .endm 121 122 .macro LOAD_KCR3 123 call .L\@.1 124 .L\@.1: popl %eax 125 movl (tramp_idleptd - .L\@.1)(%eax), %eax 126 movl %eax, %cr3 127 .endm 128 129 .macro MOVE_STACKS 130 LOAD_KCR3 131 NMOVE_STACKS 132 .endm 133 134 .macro KENTER 135 testl $PSL_VM, TF_EFLAGS(%esp) 136 jz .L\@.1 137 LOAD_KCR3 138 movl PCPU(CURPCB), %eax 139 testl $PCB_VM86CALL, PCB_FLAGS(%eax) 140 jnz .L\@.3 141 NMOVE_STACKS 142 movl $handle_ibrs_entry,%edx 143 call *%edx 144 jmp .L\@.3 145 .L\@.1: testb $SEL_RPL_MASK, TF_CS(%esp) 146 jz .L\@.3 147 .L\@.2: MOVE_STACKS 148 movl $handle_ibrs_entry,%edx 149 call *%edx 150 .L\@.3: 151 .endm 152 153 #endif /* LOCORE */ 154 155 #ifdef __STDC__ 156 #define ELFNOTE(name, type, desctype, descdata...) \ 157 .pushsection .note.name, "a", @note ; \ 158 .align 4 ; \ 159 .long 2f - 1f /* namesz */ ; \ 160 .long 4f - 3f /* descsz */ ; \ 161 .long type ; \ 162 1:.asciz #name ; \ 163 2:.align 4 ; \ 164 3:desctype descdata ; \ 165 4:.align 4 ; \ 166 .popsection 167 #else /* !__STDC__, i.e. -traditional */ 168 #define ELFNOTE(name, type, desctype, descdata) \ 169 .pushsection .note.name, "a", @note ; \ 170 .align 4 ; \ 171 .long 2f - 1f /* namesz */ ; \ 172 .long 4f - 3f /* descsz */ ; \ 173 .long type ; \ 174 1:.asciz "name" ; \ 175 2:.align 4 ; \ 176 3:desctype descdata ; \ 177 4:.align 4 ; \ 178 .popsection 179 #endif /* __STDC__ */ 180 181 #endif /* !_MACHINE_ASMACROS_H_ */ 182