/* -*- mode: asm -*- */ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1993 The Regents of the University of California. * All rights reserved. * * Copyright (c) 2018 The FreeBSD Foundation * All rights reserved. * * Portions of this software were developed by * Konstantin Belousov under sponsorship from * the FreeBSD Foundation. * * 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. * * $FreeBSD$ */ #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 3 /* 8 byte alignment, zero filled */ #define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */ #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 ENTRY(name) GEN_ENTRY(name) #define ALTENTRY(name) GEN_ENTRY(name) #define END(name) .size name, . - name /* * Convenience for adding frame pointers to hand-coded ASM. Useful for * DTrace, HWPMC, and KDB. */ #define PUSH_FRAME_POINTER \ pushq %rbp ; \ movq %rsp, %rbp ; #define POP_FRAME_POINTER \ popq %rbp #ifdef LOCORE /* * Access per-CPU data. */ #define PCPU(member) %gs:PC_ ## member #define PCPU_ADDR(member, reg) \ movq %gs:PC_PRVSPACE, reg ; \ addq $PC_ ## member, reg /* * Convenience macro for declaring interrupt entry points. */ #define IDTVEC(name) ALIGN_TEXT; .globl __CONCAT(X,name); \ .type __CONCAT(X,name),@function; __CONCAT(X,name): .macro SAVE_SEGS movw %fs,TF_FS(%rsp) movw %gs,TF_GS(%rsp) movw %es,TF_ES(%rsp) movw %ds,TF_DS(%rsp) .endm .macro MOVE_STACKS qw .L.offset=0 .rept \qw movq .L.offset(%rsp),%rdx movq %rdx,.L.offset(%rax) .L.offset=.L.offset+8 .endr .endm .macro PTI_UUENTRY has_err movq PCPU(KCR3),%rax movq %rax,%cr3 movq PCPU(RSP0),%rax subq $PTI_SIZE - 8 * (1 - \has_err),%rax MOVE_STACKS ((PTI_SIZE / 8) - 1 + \has_err) movq %rax,%rsp popq %rdx popq %rax .endm .macro PTI_UENTRY has_err swapgs lfence cmpq $~0,PCPU(UCR3) je 1f pushq %rax pushq %rdx PTI_UUENTRY \has_err 1: .endm .macro PTI_ENTRY name, contk, contu, has_err=0 ALIGN_TEXT .globl X\name\()_pti .type X\name\()_pti,@function X\name\()_pti: /* %rax, %rdx, and possibly err are not yet pushed */ testb $SEL_RPL_MASK,PTI_CS-PTI_ERR-((1-\has_err)*8)(%rsp) jz \contk PTI_UENTRY \has_err jmp \contu .endm .macro PTI_INTRENTRY vec_name SUPERALIGN_TEXT .globl X\vec_name\()_pti .type X\vec_name\()_pti,@function X\vec_name\()_pti: testb $SEL_RPL_MASK,PTI_CS-3*8(%rsp) /* err, %rax, %rdx not pushed */ jz .L\vec_name\()_u PTI_UENTRY has_err=0 jmp .L\vec_name\()_u .endm .macro INTR_PUSH_FRAME vec_name SUPERALIGN_TEXT .globl X\vec_name .type X\vec_name,@function X\vec_name: testb $SEL_RPL_MASK,PTI_CS-3*8(%rsp) /* come from kernel? */ jz .L\vec_name\()_u /* Yes, dont swapgs again */ swapgs .L\vec_name\()_u: lfence subq $TF_RIP,%rsp /* skip dummy tf_err and tf_trapno */ movq %rdi,TF_RDI(%rsp) movq %rsi,TF_RSI(%rsp) movq %rdx,TF_RDX(%rsp) movq %rcx,TF_RCX(%rsp) movq %r8,TF_R8(%rsp) movq %r9,TF_R9(%rsp) movq %rax,TF_RAX(%rsp) movq %rbx,TF_RBX(%rsp) movq %rbp,TF_RBP(%rsp) movq %r10,TF_R10(%rsp) movq %r11,TF_R11(%rsp) movq %r12,TF_R12(%rsp) movq %r13,TF_R13(%rsp) movq %r14,TF_R14(%rsp) movq %r15,TF_R15(%rsp) SAVE_SEGS movl $TF_HASSEGS,TF_FLAGS(%rsp) pushfq andq $~(PSL_D|PSL_AC),(%rsp) popfq testb $SEL_RPL_MASK,TF_CS(%rsp) /* come from kernel ? */ jz 1f /* yes, leave PCB_FULL_IRET alone */ movq PCPU(CURPCB),%r8 andl $~PCB_FULL_IRET,PCB_FLAGS(%r8) call handle_ibrs_entry 1: .endm .macro INTR_HANDLER vec_name .text PTI_INTRENTRY \vec_name INTR_PUSH_FRAME \vec_name .endm .macro RESTORE_REGS movq TF_RDI(%rsp),%rdi movq TF_RSI(%rsp),%rsi movq TF_RDX(%rsp),%rdx movq TF_RCX(%rsp),%rcx movq TF_R8(%rsp),%r8 movq TF_R9(%rsp),%r9 movq TF_RAX(%rsp),%rax movq TF_RBX(%rsp),%rbx movq TF_RBP(%rsp),%rbp movq TF_R10(%rsp),%r10 movq TF_R11(%rsp),%r11 movq TF_R12(%rsp),%r12 movq TF_R13(%rsp),%r13 movq TF_R14(%rsp),%r14 movq TF_R15(%rsp),%r15 .endm #ifdef KMSAN /* * The KMSAN runtime relies on a TLS block to track initialization and origin * state for function parameters and return values. To keep this state * consistent in the face of asynchronous kernel-mode traps, the runtime * maintains a stack of blocks: when handling an exception or interrupt, * kmsan_intr_enter() pushes the new block to be used until the handler is * complete, at which point kmsan_intr_leave() restores the previous block. * * Thus, KMSAN_ENTER/LEAVE hooks are required only in handlers for events that * may have happened while in kernel-mode. In particular, they are not required * around amd64_syscall() or ast() calls. Otherwise, kmsan_intr_enter() can be * called unconditionally, without distinguishing between entry from user-mode * or kernel-mode. */ #define KMSAN_ENTER callq kmsan_intr_enter #define KMSAN_LEAVE callq kmsan_intr_leave #else #define KMSAN_ENTER #define KMSAN_LEAVE #endif #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_ */