mirror of
https://codeberg.org/ziglang/zig.git
synced 2026-04-30 06:42:48 +03:00
Alex Rønne Petersen
66d97267c7
This excludes all headers in /usr/include/dev because that directory is bonkers huge (18M). We can add these on an as-needed basis.
196 lines
5.6 KiB
C
Vendored
196 lines
5.6 KiB
C
Vendored
/* $OpenBSD: asm.h,v 1.24 2023/04/17 00:02:14 deraadt Exp $ */
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/* $NetBSD: asm.h,v 1.2 2003/05/02 18:05:47 yamt Exp $ */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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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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* @(#)asm.h 5.5 (Berkeley) 5/7/91
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*/
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#ifndef _MACHINE_ASM_H_
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#define _MACHINE_ASM_H_
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#ifdef __PIC__
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#define PIC_PLT(x) x@PLT
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#define PIC_GOT(x) x@GOTPCREL(%rip)
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#else
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#define PIC_PLT(x) x
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#define PIC_GOT(x) x
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#endif
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# define _C_LABEL(x) x
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#define _ASM_LABEL(x) x
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#define CVAROFF(x,y) (x+y)(%rip)
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#ifdef __STDC__
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# define __CONCAT(x,y) x ## y
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# define __STRING(x) #x
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#else
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# define __CONCAT(x,y) x/**/y
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# define __STRING(x) "x"
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#endif
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/* let kernels and others override entrypoint alignment */
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#ifndef _ALIGN_TEXT
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#define _ALIGN_TEXT .align 16, 0x90
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#endif
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#define _ALIGN_TRAPS .align 16, 0xcc
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#define _FENTRY(x) .type x,@function; x:
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/* NB == No Binding: use .globl or .weak as necessary */
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#define NENTRY_NB(x) \
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.text; _ALIGN_TEXT; _FENTRY(x)
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#define _ENTRY_NB(x) \
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.text; _ALIGN_TRAPS; _FENTRY(x)
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#define _ENTRY(x) .globl x; _ENTRY_NB(x)
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#define _NENTRY(x) .globl x; NENTRY_NB(x)
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#ifdef _KERNEL
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#define KUTEXT .section .kutext, "ax", @progbits
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#define KUTEXT_PAGE_START .pushsection .kutext.page, "a", @progbits
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#define KTEXT_PAGE_START .pushsection .ktext.page, "ax", @progbits
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#define KUTEXT_PAGE_END .popsection
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#define KTEXT_PAGE_END .popsection
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#define IDTVEC(name) \
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KUTEXT; _ALIGN_TRAPS; IDTVEC_NOALIGN(name); endbr64
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#define GENTRY(x) .globl x; _FENTRY(x)
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#define IDTVEC_NOALIGN(name) GENTRY(X ## name)
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#define IDTVEC_ALIAS(alias,sym) \
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.global X ## alias; \
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X ## alias = X ## sym;
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#define KIDTVEC(name) \
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.text; _ALIGN_TRAPS; IDTVEC_NOALIGN(name); endbr64
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#define KIDTVEC_FALLTHROUGH(name) \
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_ALIGN_TEXT; IDTVEC_NOALIGN(name)
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#define KUENTRY(x) \
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KUTEXT; _ALIGN_TRAPS; GENTRY(x)
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/* Return stack refill, to prevent speculation attacks on natural returns */
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#define RET_STACK_REFILL_WITH_RCX \
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mov $8,%rcx ; \
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_ALIGN_TEXT ; \
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3: call 5f ; \
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4: pause ; \
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lfence ; \
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call 4b ; \
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_ALIGN_TRAPS ; \
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5: call 7f ; \
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6: pause ; \
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lfence ; \
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call 6b ; \
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_ALIGN_TRAPS ; \
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7: loop 3b ; \
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add $(16*8),%rsp
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#endif /* _KERNEL */
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#ifdef __STDC__
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#define CPUVAR(off) %gs:CPU_INFO_ ## off
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#else
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#define CPUVAR(off) %gs:CPU_INFO_/**/off
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#endif
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#if defined(PROF) || defined(GPROF)
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# define _PROF_PROLOGUE \
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pushq %rbp; leaq (%rsp),%rbp; call PIC_PLT(__mcount); popq %rbp
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#else
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# define _PROF_PROLOGUE
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#endif
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#if defined(_RET_PROTECTOR)
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# define RETGUARD_SETUP_OFF(x, reg, off) \
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RETGUARD_SYMBOL(x); \
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movq (__retguard_ ## x)(%rip), %reg; \
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xorq off(%rsp), %reg
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# define RETGUARD_SETUP(x, reg) \
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RETGUARD_SETUP_OFF(x, reg, 0)
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# define RETGUARD_CHECK(x, reg) \
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xorq (%rsp), %reg; \
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cmpq (__retguard_ ## x)(%rip), %reg; \
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je 66f; \
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int3; int3; \
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.zero (0xf - ((. + 3 - x) & 0xf)), 0xcc; \
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66:
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# define RETGUARD_PUSH(reg) \
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pushq %reg
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# define RETGUARD_POP(reg) \
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popq %reg
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# define RETGUARD_SYMBOL(x) \
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.ifndef __retguard_ ## x; \
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.hidden __retguard_ ## x; \
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.type __retguard_ ## x,@object; \
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.pushsection .openbsd.randomdata.retguard,"aw",@progbits; \
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.weak __retguard_ ## x; \
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.p2align 3; \
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__retguard_ ## x: ; \
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.quad 0; \
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.size __retguard_ ## x, 8; \
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.popsection; \
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.endif
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#else
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# define RETGUARD_SETUP_OFF(x, reg, off)
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# define RETGUARD_SETUP(x, reg)
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# define RETGUARD_CHECK(x, reg)
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# define RETGUARD_PUSH(reg)
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# define RETGUARD_POP(reg)
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# define RETGUARD_SYMBOL(x)
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#endif
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#define ENTRY(y) _ENTRY(y); endbr64; _PROF_PROLOGUE
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#define NENTRY(y) _NENTRY(y)
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#define ASENTRY(y) _NENTRY(y); endbr64; _PROF_PROLOGUE
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#define ENTRY_NB(y) _ENTRY_NB(y); endbr64; _PROF_PROLOGUE
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#define END(y) .size y, . - y
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#define STRONG_ALIAS(alias,sym) \
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.global alias; \
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alias = sym
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#define WEAK_ALIAS(alias,sym) \
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.weak alias; \
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alias = sym
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/* generic retpoline ("return trampoline") generator */
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#define JMP_RETPOLINE(reg) \
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call 69f ; \
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68: pause ; \
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lfence ; \
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jmp 68b ; \
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_ALIGN_TRAPS ; \
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69: mov %reg,(%rsp) ; \
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ret ; \
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lfence
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#endif /* !_MACHINE_ASM_H_ */ |