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minix/include/sys/cdefs_elf.h
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify. 
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

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/* $NetBSD: cdefs_elf.h,v 1.34 2010/12/08 01:18:55 joerg Exp $ */
/*
* Copyright (c) 1995, 1996 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#ifndef _SYS_CDEFS_ELF_H_
#define _SYS_CDEFS_ELF_H_
#ifdef __LEADING_UNDERSCORE
#define _C_LABEL(x) __CONCAT(_,x)
#define _C_LABEL_STRING(x) "_"x
#else
#define _C_LABEL(x) x
#define _C_LABEL_STRING(x) x
#endif
#if __STDC__
#define ___RENAME(x) __asm(___STRING(_C_LABEL(x)))
#else
#ifdef __LEADING_UNDERSCORE
#define ___RENAME(x) ____RENAME(_/**/x)
#define ____RENAME(x) __asm(___STRING(x))
#else
#define ___RENAME(x) __asm(___STRING(x))
#endif
#endif
#define __indr_reference(sym,alias) /* nada, since we do weak refs */
#if __STDC__
#define __strong_alias(alias,sym) \
__asm(".global " _C_LABEL_STRING(#alias) "\n" \
_C_LABEL_STRING(#alias) " = " _C_LABEL_STRING(#sym));
#define __weak_alias(alias,sym) \
__asm(".weak " _C_LABEL_STRING(#alias) "\n" \
_C_LABEL_STRING(#alias) " = " _C_LABEL_STRING(#sym));
/* Do not use __weak_extern, use __weak_reference instead */
#define __weak_extern(sym) \
__asm(".weak " _C_LABEL_STRING(#sym));
#if __GNUC_PREREQ__(4, 0) && !defined(__minix)
#define __weak_reference(sym) __attribute__((__weakref__))
#else
#define __weak_reference(sym) ; __asm(".weak " _C_LABEL_STRING(#sym))
#endif
#if defined(__clang__)
#define __warn_references(sym,msg) \
static __attribute__((__used__, __section__(".gnu.warning." #sym))) \
const char ___CONCAT(__warn_reference_##sym,__COUNTER__)[] = msg;
#else
#define __warn_references(sym,msg) \
__asm(".pushsection .gnu.warning." #sym "\n" \
".ascii \"" msg "\"\n" \
".popsection");
#endif
#else /* !__STDC__ */
#ifdef __LEADING_UNDERSCORE
#define __weak_alias(alias,sym) ___weak_alias(_/**/alias,_/**/sym)
#define ___weak_alias(alias,sym) \
__asm(".weak alias\nalias = sym");
#else
#define __weak_alias(alias,sym) \
__asm(".weak alias\nalias = sym");
#endif
#ifdef __LEADING_UNDERSCORE
#define __weak_extern(sym) ___weak_extern(_/**/sym)
#define ___weak_extern(sym) \
__asm(".weak sym");
#else
#define __weak_extern(sym) \
__asm(".weak sym");
#endif
#define __warn_references(sym,msg) \
__asm(".pushsection .gnu.warning.sym\n" \
".ascii \"" msg "\"\n" \
".popsection");
#endif /* !__STDC__ */
#if defined(__clang__)
#define __SECTIONSTRING(_sec, _str) \
static __attribute__((__used__, __section__(#_sec))) const char \
___CONCAT(__sectstr,__COUNTER__)[] = _str
#elif __STDC__
#define __SECTIONSTRING(_sec, _str) \
__asm(".pushsection " #_sec "\n" \
".asciz \"" _str "\"\n" \
".popsection")
#else
#define __SECTIONSTRING(_sec, _str) \
__asm(".pushsection _sec\n" \
".asciz \"" _str "\"\n" \
".popsection")
#endif
#define __IDSTRING(_n,_s) __SECTIONSTRING(.ident,_s)
#define __RCSID(_s) __IDSTRING(rcsid,_s)
#define __SCCSID(_s)
#define __SCCSID2(_s)
#define __COPYRIGHT(_s) __SECTIONSTRING(.copyright,_s)
#define __KERNEL_RCSID(_n, _s) __RCSID(_s)
#define __KERNEL_SCCSID(_n, _s)
#define __KERNEL_COPYRIGHT(_n, _s) __COPYRIGHT(_s)
#ifndef __lint__
#define __link_set_make_entry(set, sym) \
static void const * const __link_set_##set##_sym_##sym \
__section("link_set_" #set) __used = &sym
#define __link_set_make_entry2(set, sym, n) \
static void const * const __link_set_##set##_sym_##sym##_##n \
__section("link_set_" #set) __used = &sym[n]
#else
#define __link_set_make_entry(set, sym) \
extern void const * const __link_set_##set##_sym_##sym
#define __link_set_make_entry2(set, sym, n) \
extern void const * const __link_set_##set##_sym_##sym##_##n
#endif /* __lint__ */
#define __link_set_add_text(set, sym) __link_set_make_entry(set, sym)
#define __link_set_add_rodata(set, sym) __link_set_make_entry(set, sym)
#define __link_set_add_data(set, sym) __link_set_make_entry(set, sym)
#define __link_set_add_bss(set, sym) __link_set_make_entry(set, sym)
#define __link_set_add_text2(set, sym, n) __link_set_make_entry2(set, sym, n)
#define __link_set_add_rodata2(set, sym, n) __link_set_make_entry2(set, sym, n)
#define __link_set_add_data2(set, sym, n) __link_set_make_entry2(set, sym, n)
#define __link_set_add_bss2(set, sym, n) __link_set_make_entry2(set, sym, n)
#define __link_set_decl(set, ptype) \
extern ptype * const __start_link_set_##set[]; \
extern ptype * const __stop_link_set_##set[] \
#define __link_set_start(set) (__start_link_set_##set)
#define __link_set_end(set) (__stop_link_set_##set)
#define __link_set_count(set) \
(__link_set_end(set) - __link_set_start(set))
#ifdef _KERNEL
/*
* On multiprocessor systems we can gain an improvement in performance
* by being mindful of which cachelines data is placed in.
*
* __read_mostly:
*
* It makes sense to ensure that rarely modified data is not
* placed in the same cacheline as frequently modified data.
* To mitigate the phenomenon known as "false-sharing" we
* can annotate rarely modified variables with __read_mostly.
* All such variables are placed into the .data.read_mostly
* section in the kernel ELF.
*
* Prime candidates for __read_mostly annotation are variables
* which are hardly ever modified and which are used in code
* hot-paths, e.g. pmap_initialized.
*
* __cacheline_aligned:
*
* Some data structures (mainly locks) benefit from being aligned
* on a cacheline boundary, and having a cacheline to themselves.
* This way, the modification of other data items cannot adversely
* affect the lock and vice versa.
*
* Any variables annotated with __cacheline_aligned will be
* placed into the .data.cacheline_aligned ELF section.
*/
#define __read_mostly \
__attribute__((__section__(".data.read_mostly")))
#define __cacheline_aligned \
__attribute__((__aligned__(COHERENCY_UNIT) \
__section__(".data.cacheline_aligned")))
#endif /* _KERNEL */
#endif /* !_SYS_CDEFS_ELF_H_ */
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