/* -*- mode: asm -*- */ /*- * SPDX-License-Identifier: BSD-3-Clause * * 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. * 3. 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. */ #ifndef _MACHINE_ASMACROS_H_ #define _MACHINE_ASMACROS_H_ #include /* 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 *__mcountp ; popl %ecx #define MCOUNT call *__mcountp #define MCOUNT_LABEL(name) GEN_ENTRY(name) ; nop ; ALIGN_TEXT #ifdef GUPROF #define MEXITCOUNT call *__mexitcountp #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 #define GSEL_KPL 0x0020 /* GSEL(GCODE_SEL, SEL_KPL) */ #define SEL_RPL_MASK 0x0003 /* * 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. */ .macro PUSH_FRAME2 pushal pushl $0 movw %ds,(%esp) pushl $0 movw %es,(%esp) pushl $0 movw %fs,(%esp) movl %esp,%ebp .endm .macro PUSH_FRAME pushl $0 /* dummy error code */ pushl $0 /* dummy trap type */ PUSH_FRAME2 .endm /* * 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. */ .macro SET_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 .endm .macro NMOVE_STACKS movl PCPU(KESP0), %edx movl $TF_SZ, %ecx testl $PSL_VM, TF_EFLAGS(%esp) jz .L\@.1 addl $VM86_STACK_SPACE, %ecx .L\@.1: subl %ecx, %edx movl %edx, %edi movl %esp, %esi rep; movsb movl %edx, %esp .endm .macro LOAD_KCR3 call .L\@.1 .L\@.1: popl %eax movl (tramp_idleptd - .L\@.1)(%eax), %eax movl %eax, %cr3 .endm .macro MOVE_STACKS LOAD_KCR3 NMOVE_STACKS .endm .macro KENTER testl $PSL_VM, TF_EFLAGS(%esp) jz .L\@.1 LOAD_KCR3 movl PCPU(CURPCB), %eax testl $PCB_VM86CALL, PCB_FLAGS(%eax) jnz .L\@.3 NMOVE_STACKS movl $handle_ibrs_entry,%edx call *%edx jmp .L\@.3 .L\@.1: testb $SEL_RPL_MASK, TF_CS(%esp) jz .L\@.3 .L\@.2: MOVE_STACKS movl $handle_ibrs_entry,%edx call *%edx .L\@.3: .endm #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 /* !_MACHINE_ASMACROS_H_ */