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6e64bc845f
osreldate.h and sys/param.h were manually adjusted to not __FreeBSD_version since it will be defined by the compiler.
270 lines
No EOL
7.9 KiB
C
Vendored
270 lines
No EOL
7.9 KiB
C
Vendored
/* -*- mode: asm -*- */
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/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1993 The Regents of the University of California.
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* All rights reserved.
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*
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* Copyright (c) 2018 The FreeBSD Foundation
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* All rights reserved.
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*
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* Portions of this software were developed by
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* Konstantin Belousov <kib@FreeBSD.org> under sponsorship from
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* the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(__i386__)
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#include <i386/asmacros.h>
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#else /* !__i386__ */
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#ifndef _MACHINE_ASMACROS_H_
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#define _MACHINE_ASMACROS_H_
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#include <sys/cdefs.h>
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/* XXX too much duplication in various asm*.h's. */
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/*
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* CNAME is used to manage the relationship between symbol names in C
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* and the equivalent assembly language names. CNAME is given a name as
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* it would be used in a C program. It expands to the equivalent assembly
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* language name.
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*/
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#define CNAME(csym) csym
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#define ALIGN_DATA .p2align 3 /* 8 byte alignment, zero filled */
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#define ALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
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#define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
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#define GEN_ENTRY(name) ALIGN_TEXT; .globl CNAME(name); \
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.type CNAME(name),@function; CNAME(name):
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#define ENTRY(name) GEN_ENTRY(name)
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#define ALTENTRY(name) GEN_ENTRY(name)
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#define END(name) .size name, . - name
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/*
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* Convenience for adding frame pointers to hand-coded ASM. Useful for
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* DTrace, HWPMC, and KDB.
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*/
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#define PUSH_FRAME_POINTER \
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pushq %rbp ; \
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movq %rsp, %rbp ;
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#define POP_FRAME_POINTER \
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popq %rbp
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#ifdef LOCORE
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/*
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* Access per-CPU data.
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*/
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#define PCPU(member) %gs:PC_ ## member
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#define PCPU_ADDR(member, reg) \
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movq %gs:PC_PRVSPACE, reg ; \
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addq $PC_ ## member, reg
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/*
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* Convenience macro for declaring interrupt entry points.
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*/
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#define IDTVEC(name) ALIGN_TEXT; .globl __CONCAT(X,name); \
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.type __CONCAT(X,name),@function; __CONCAT(X,name):
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.macro SAVE_SEGS
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movw %fs,TF_FS(%rsp)
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movw %gs,TF_GS(%rsp)
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movw %es,TF_ES(%rsp)
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movw %ds,TF_DS(%rsp)
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.endm
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.macro MOVE_STACKS qw
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.L.offset=0
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.rept \qw
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movq .L.offset(%rsp),%rdx
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movq %rdx,.L.offset(%rax)
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.L.offset=.L.offset+8
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.endr
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.endm
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.macro PTI_UUENTRY has_err
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movq PCPU(KCR3),%rax
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movq %rax,%cr3
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movq PCPU(RSP0),%rax
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subq $PTI_SIZE - 8 * (1 - \has_err),%rax
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MOVE_STACKS ((PTI_SIZE / 8) - 1 + \has_err)
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movq %rax,%rsp
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popq %rdx
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popq %rax
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.endm
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.macro PTI_UENTRY has_err
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swapgs
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lfence
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cmpq $~0,PCPU(UCR3)
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je 1f
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pushq %rax
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pushq %rdx
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PTI_UUENTRY \has_err
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1:
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.endm
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.macro PTI_ENTRY name, contk, contu, has_err=0
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ALIGN_TEXT
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.globl X\name\()_pti
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.type X\name\()_pti,@function
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X\name\()_pti:
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/* %rax, %rdx, and possibly err are not yet pushed */
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testb $SEL_RPL_MASK,PTI_CS-PTI_ERR-((1-\has_err)*8)(%rsp)
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jz \contk
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PTI_UENTRY \has_err
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jmp \contu
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.endm
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.macro PTI_INTRENTRY vec_name
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SUPERALIGN_TEXT
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.globl X\vec_name\()_pti
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.type X\vec_name\()_pti,@function
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X\vec_name\()_pti:
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testb $SEL_RPL_MASK,PTI_CS-3*8(%rsp) /* err, %rax, %rdx not pushed */
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jz .L\vec_name\()_u
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PTI_UENTRY has_err=0
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jmp .L\vec_name\()_u
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.endm
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.macro INTR_PUSH_FRAME vec_name
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SUPERALIGN_TEXT
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.globl X\vec_name
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.type X\vec_name,@function
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X\vec_name:
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testb $SEL_RPL_MASK,PTI_CS-3*8(%rsp) /* come from kernel? */
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jz .L\vec_name\()_u /* Yes, dont swapgs again */
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swapgs
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.L\vec_name\()_u:
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lfence
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subq $TF_RIP,%rsp /* skip dummy tf_err and tf_trapno */
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movq %rdi,TF_RDI(%rsp)
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movq %rsi,TF_RSI(%rsp)
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movq %rdx,TF_RDX(%rsp)
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movq %rcx,TF_RCX(%rsp)
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movq %r8,TF_R8(%rsp)
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movq %r9,TF_R9(%rsp)
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movq %rax,TF_RAX(%rsp)
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movq %rbx,TF_RBX(%rsp)
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movq %rbp,TF_RBP(%rsp)
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movq %r10,TF_R10(%rsp)
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movq %r11,TF_R11(%rsp)
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movq %r12,TF_R12(%rsp)
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movq %r13,TF_R13(%rsp)
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movq %r14,TF_R14(%rsp)
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movq %r15,TF_R15(%rsp)
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SAVE_SEGS
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movl $TF_HASSEGS,TF_FLAGS(%rsp)
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pushfq
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andq $~(PSL_D|PSL_AC),(%rsp)
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popfq
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testb $SEL_RPL_MASK,TF_CS(%rsp) /* come from kernel ? */
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jz 1f /* yes, leave PCB_FULL_IRET alone */
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movq PCPU(CURPCB),%r8
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andl $~PCB_FULL_IRET,PCB_FLAGS(%r8)
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call handle_ibrs_entry
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1:
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.endm
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.macro INTR_HANDLER vec_name
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.text
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PTI_INTRENTRY \vec_name
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INTR_PUSH_FRAME \vec_name
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.endm
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.macro RESTORE_REGS
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movq TF_RDI(%rsp),%rdi
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movq TF_RSI(%rsp),%rsi
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movq TF_RDX(%rsp),%rdx
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movq TF_RCX(%rsp),%rcx
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movq TF_R8(%rsp),%r8
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movq TF_R9(%rsp),%r9
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movq TF_RAX(%rsp),%rax
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movq TF_RBX(%rsp),%rbx
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movq TF_RBP(%rsp),%rbp
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movq TF_R10(%rsp),%r10
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movq TF_R11(%rsp),%r11
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movq TF_R12(%rsp),%r12
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movq TF_R13(%rsp),%r13
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movq TF_R14(%rsp),%r14
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movq TF_R15(%rsp),%r15
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.endm
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#ifdef KMSAN
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/*
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* The KMSAN runtime relies on a TLS block to track initialization and origin
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* state for function parameters and return values. To keep this state
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* consistent in the face of asynchronous kernel-mode traps, the runtime
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* maintains a stack of blocks: when handling an exception or interrupt,
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* kmsan_intr_enter() pushes the new block to be used until the handler is
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* complete, at which point kmsan_intr_leave() restores the previous block.
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*
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* Thus, KMSAN_ENTER/LEAVE hooks are required only in handlers for events that
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* may have happened while in kernel-mode. In particular, they are not required
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* around amd64_syscall() or ast() calls. Otherwise, kmsan_intr_enter() can be
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* called unconditionally, without distinguishing between entry from user-mode
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* or kernel-mode.
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*/
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#define KMSAN_ENTER callq kmsan_intr_enter
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#define KMSAN_LEAVE callq kmsan_intr_leave
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#else
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#define KMSAN_ENTER
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#define KMSAN_LEAVE
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#endif
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#endif /* LOCORE */
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#ifdef __STDC__
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#define ELFNOTE(name, type, desctype, descdata...) \
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.pushsection .note.name, "a", @note ; \
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.align 4 ; \
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.long 2f - 1f /* namesz */ ; \
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.long 4f - 3f /* descsz */ ; \
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.long type ; \
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1:.asciz #name ; \
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2:.align 4 ; \
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3:desctype descdata ; \
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4:.align 4 ; \
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.popsection
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#else /* !__STDC__, i.e. -traditional */
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#define ELFNOTE(name, type, desctype, descdata) \
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.pushsection .note.name, "a", @note ; \
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.align 4 ; \
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.long 2f - 1f /* namesz */ ; \
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.long 4f - 3f /* descsz */ ; \
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.long type ; \
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1:.asciz "name" ; \
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2:.align 4 ; \
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3:desctype descdata ; \
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4:.align 4 ; \
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.popsection
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#endif /* __STDC__ */
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#endif /* !_MACHINE_ASMACROS_H_ */
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#endif /* __i386__ */ |