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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
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2.7 KiB
Groff
90 lines
2.7 KiB
Groff
.\" $NetBSD: __builtin_object_size.3,v 1.8 2010/12/19 09:33:52 jruoho Exp $
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.\"
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.\" Copyright (c) 2007 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Christos Zoulas.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\"
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.Dd December 19, 2010
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.Dt __BUILTIN_OBJECT_SIZE 3
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.Os
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.Sh NAME
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.Nm __builtin_object_size
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.Nd return the size of the given object
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.Sh SYNOPSIS
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.Ft size_t
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.Fn __builtin_object_size "void *ptr" "int type"
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.Sh DESCRIPTION
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The
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.Fn __builtin_object_size
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function is a
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.Xr gcc 1
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built-in function that returns the size of the
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.Fa ptr
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object if known at compile time and the object does not have any side
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effects.
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.Sh RETURN VALUES
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If the size of the object is not known or it has side effects the
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.Fn __builtin_object_size
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function returns:
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.Bl -tag -width (size_t)-1 -offset indent
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.It Dv (size_t)-1
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for
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.Fa type
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.Dv 0
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and
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.Dv 1 .
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.It Dv (size_t)0
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for
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.Fa type
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.Dv 2
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and
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.Dv 3 .
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.El
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.Pp
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If the size of the object is known, then the
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.Fn __builtin_object_size
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function returns the maximum size of all the objects that the compiler
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knows that they can be pointed to by
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.Fa ptr
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when
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.Fa type
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.Dv \*[Am] 2 == 0 ,
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and the minimum size when
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.Fa type
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.Dv \*[Am] 2 != 0 .
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.Sh SEE ALSO
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.Xr gcc 1 ,
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.Xr __builtin_return_address 3 ,
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.Xr attribute 3 ,
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.Xr ssp 3
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.Sh HISTORY
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The
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.Fn __builtin_object_size
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appeared in
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.Tn GCC 4.1 .
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.Sh CAVEATS
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This is a non-standard, compiler-specific extension.
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