tools/build: Provide sys/linker_set.h when cross-building
This is needed for kldxref, which will shortly become a bootstrap tool. Linux can use the same one as FreeBSD (provided the cross-building sys/cdefs.h is augmented appropriately), whilst macOS needs its own Mach-O-specific implementation. Reviewed by: brooks Differential Revision: https://reviews.freebsd.org/D43049
This commit is contained in:
Jessica Clarke
parent
1fead66b64
commit
881ec81372
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@ -216,6 +216,10 @@ SRCS+= progname.c
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# Stub implementations of fflagstostr/strtofflags
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SRCS+= fflags.c
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# macOS has a standalone cross-build implementation, but Linux can use the same
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# ELF one as FreeBSD
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SYSINCS+= ${SRCTOP}/sys/sys/linker_set.h
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.endif # ${MAKE.OS} == "Linux"
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.if ${.MAKE.OS} == "Darwin"
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@ -121,6 +121,12 @@
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#endif
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#endif
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#ifndef __WEAK
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#ifdef __ELF__
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#define __WEAK(sym) __asm__(".weak " __XSTRING(sym))
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#endif
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#endif
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/* Some files built as part of the bootstrap libegacy use these macros, but
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* since we aren't actually building libc.so, we can defined them to be empty */
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#ifndef __sym_compat
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@ -249,6 +255,13 @@
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#define __DEQUALIFY(type, var) ((type)(__uintptr_t)(const volatile void *)(var))
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#endif
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#ifndef __nosanitizeaddress
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#if __has_attribute(no_sanitize) && defined(__clang__)
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#define __nosanitizeaddress __attribute__((no_sanitize("address")))
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#else
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#define __nosanitizeaddress
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#endif
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#endif
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/* Expose all declarations when using FreeBSD headers */
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#define __POSIX_VISIBLE 200809
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@ -0,0 +1,140 @@
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/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 1999 John D. Polstra
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* Copyright (c) 1999,2001 Peter Wemm <peter@FreeBSD.org>
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* All rights reserved.
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* Copyright (c) 2023 Jessica Clarke <jrtc27@FreeBSD.org>
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#ifndef _SYS_LINKER_SET_H_
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#define _SYS_LINKER_SET_H_
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#include <mach-o/dyld.h>
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#include <mach-o/getsect.h>
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/*
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* The following macros are used to declare global sets of objects, which
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* are collected by the linker into a `linker_set' as defined below.
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* For Mach-O, this is done by constructing a separate section for each set.
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*/
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#define __MAKE_SET_CONST const
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/*
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* Private macros, not to be used outside this header file.
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*/
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/*
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* The userspace address sanitizer inserts redzones around global variables,
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* violating the assumption that linker set elements are packed.
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*/
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#define __NOASAN __nosanitizeaddress
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#define __MAKE_SET_QV(set, sym, qv) \
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static void const * qv \
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__NOASAN \
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__set_##set##_sym_##sym __section("__DATA,set_" #set) \
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__used = &(sym)
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#define __MAKE_SET(set, sym) __MAKE_SET_QV(set, sym, __MAKE_SET_CONST)
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static inline __pure2 uint8_t *
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__set_getsectiondata(const char *segname, const char *sectname,
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unsigned long *size)
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{
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uint32_t image_count, image_index;
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const struct mach_header *mh;
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uint8_t *ret;
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image_count = _dyld_image_count();
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for (image_index = 0; image_index < image_count; ++image_index) {
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mh = _dyld_get_image_header(image_index);
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if (mh == NULL)
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continue;
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ret = getsectiondata((const struct mach_header_64 *)mh,
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segname, sectname, size);
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if (ret != NULL)
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return (ret);
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}
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return (NULL);
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}
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#define __SET_RANGE(set) ({ \
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unsigned long __set_size; \
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char *__set_data; \
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__set_data = __set_getsectiondata("__DATA", \
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"set_" #set, &__set_size); \
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(struct { \
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__CONCAT(__typeof_set_,set) **begin; \
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__CONCAT(__typeof_set_,set) **limit; \
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}){ \
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.begin = (__CONCAT(__typeof_set_,set) **)__set_data, \
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.limit = (__CONCAT(__typeof_set_,set) **)(__set_data + \
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__set_size) \
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}; \
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})
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/*
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* Public macros.
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*/
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#define TEXT_SET(set, sym) __MAKE_SET(set, sym)
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#define DATA_SET(set, sym) __MAKE_SET(set, sym)
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#define DATA_WSET(set, sym) __MAKE_SET_QV(set, sym, )
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#define BSS_SET(set, sym) __MAKE_SET(set, sym)
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#define ABS_SET(set, sym) __MAKE_SET(set, sym)
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#define SET_ENTRY(set, sym) __MAKE_SET(set, sym)
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/*
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* Initialize before referring to a given linker set.
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*/
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#define SET_DECLARE(set, ptype) \
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typedef ptype __CONCAT(__typeof_set_,set)
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#define SET_BEGIN(set) \
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(__SET_RANGE(set).begin)
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#define SET_LIMIT(set) \
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(__SET_RANGE(set).limit)
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/*
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* Iterate over all the elements of a set.
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*
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* Sets always contain addresses of things, and "pvar" points to words
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* containing those addresses. Thus is must be declared as "type **pvar",
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* and the address of each set item is obtained inside the loop by "*pvar".
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*/
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#define SET_FOREACH(pvar, set) \
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for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++)
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#define SET_ITEM(set, i) \
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((SET_BEGIN(set))[i])
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/*
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* Provide a count of the items in a set.
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*/
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#define SET_COUNT(set) \
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(SET_LIMIT(set) - SET_BEGIN(set))
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#endif /* _SYS_LINKER_SET_H_ */
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