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 movl %esp,%ebp 161 .endm 162 163 .macro PUSH_FRAME 164 pushl $0 /* dummy error code */ 165 pushl $0 /* dummy trap type */ 166 PUSH_FRAME2 167 .endm 168 169 /* 170 * Access per-CPU data. 171 */ 172 #define PCPU(member) %fs:PC_ ## member 173 174 #define PCPU_ADDR(member, reg) \ 175 movl %fs:PC_PRVSPACE, reg ; \ 176 addl $PC_ ## member, reg 177 178 /* 179 * Setup the kernel segment registers. 180 */ 181 .macro SET_KERNEL_SREGS 182 movl $KDSEL, %eax /* reload with kernel's data segment */ 183 movl %eax, %ds 184 movl %eax, %es 185 movl $KPSEL, %eax /* reload with per-CPU data segment */ 186 movl %eax, %fs 187 .endm 188 189 .macro NMOVE_STACKS 190 movl PCPU(KESP0), %edx 191 movl $TF_SZ, %ecx 192 testl $PSL_VM, TF_EFLAGS(%esp) 193 jz .L\@.1 194 addl $VM86_STACK_SPACE, %ecx 195 .L\@.1: subl %ecx, %edx 196 movl %edx, %edi 197 movl %esp, %esi 198 rep; movsb 199 movl %edx, %esp 200 .endm 201 202 .macro LOAD_KCR3 203 call .L\@.1 204 .L\@.1: popl %eax 205 movl (tramp_idleptd - .L\@.1)(%eax), %eax 206 movl %eax, %cr3 207 .endm 208 209 .macro MOVE_STACKS 210 LOAD_KCR3 211 NMOVE_STACKS 212 .endm 213 214 .macro KENTER 215 testl $PSL_VM, TF_EFLAGS(%esp) 216 jz .L\@.1 217 LOAD_KCR3 218 movl PCPU(CURPCB), %eax 219 testl $PCB_VM86CALL, PCB_FLAGS(%eax) 220 jnz .L\@.3 221 NMOVE_STACKS 222 movl $handle_ibrs_entry,%edx 223 call *%edx 224 jmp .L\@.3 225 .L\@.1: testb $SEL_RPL_MASK, TF_CS(%esp) 226 jz .L\@.3 227 .L\@.2: MOVE_STACKS 228 movl $handle_ibrs_entry,%edx 229 call *%edx 230 .L\@.3: 231 .endm 232 233 #endif /* LOCORE */ 234 235 #ifdef __STDC__ 236 #define ELFNOTE(name, type, desctype, descdata...) \ 237 .pushsection .note.name ; \ 238 .align 4 ; \ 239 .long 2f - 1f /* namesz */ ; \ 240 .long 4f - 3f /* descsz */ ; \ 241 .long type ; \ 242 1:.asciz #name ; \ 243 2:.align 4 ; \ 244 3:desctype descdata ; \ 245 4:.align 4 ; \ 246 .popsection 247 #else /* !__STDC__, i.e. -traditional */ 248 #define ELFNOTE(name, type, desctype, descdata) \ 249 .pushsection .note.name ; \ 250 .align 4 ; \ 251 .long 2f - 1f /* namesz */ ; \ 252 .long 4f - 3f /* descsz */ ; \ 253 .long type ; \ 254 1:.asciz "name" ; \ 255 2:.align 4 ; \ 256 3:desctype descdata ; \ 257 4:.align 4 ; \ 258 .popsection 259 #endif /* __STDC__ */ 260 261 #endif /* !_MACHINE_ASMACROS_H_ */ 262