Removed some garbage (genassym(8) and its infrastructure).
This commit is contained in:
Bruce Evans
parent
7ee0d89c3e
commit
58445af0f8
@ -610,7 +610,7 @@ _perl= gnu/usr.bin/perl/libperl gnu/usr.bin/perl/miniperl
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.endif
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cross-tools:
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.for _tool in ${_btxld} ${_elf2exe} ${_perl} usr.bin/genassym \
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.for _tool in ${_btxld} ${_elf2exe} ${_perl} \
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usr.bin/gensetdefs gnu/usr.bin/binutils usr.bin/objformat gnu/usr.bin/cc
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cd ${.CURDIR}/${_tool}; \
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${MAKE} obj; \
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@ -51,7 +51,6 @@ SUBDIR= apply \
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fstat \
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fsync \
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ftp \
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genassym \
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gencat \
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gensetdefs \
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getconf \
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@ -1,9 +0,0 @@
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# $FreeBSD$
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TARGET_ARCH?= ${MACHINE_ARCH}
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PROG= genassym
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MAN8= genassym.8
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CFLAGS+= -Wall -Darch_${TARGET_ARCH}
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.include <bsd.prog.mk>
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@ -1,76 +0,0 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd December 20, 1999
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.Dt GENASSYM 8
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.Os
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.Sh NAME
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.Nm genassym
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.Nd generate assembler symbols from C
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.Sh SYNOPSIS
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.Nm
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.Op Fl o Ar outfile
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.Ar objfile
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.Sh DESCRIPTION
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The
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.Nm
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command is a special-purpose program to generate assembler
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symbols from C code and is used to interface the low-level
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assembly code with the C code.
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This, for example, is used
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to build a
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.Fx
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kernel or module.
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Its
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.Ar objfile
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argument is the name of an ELF object file that holds the
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symbol definitions.
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These definitions are extracted from
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the object file and written to standard output or to the
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file specified with
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.Ar outfile ,
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suitable for inclusion in assembler source files.
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.Pp
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The
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.Nm
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command only extracts symbols from the object file if they
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are prefixed by
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.Nm assym_
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and are global data types, whose value is the value given
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to the symbol.
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The following C declaration
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.Bd -literal -offset indent -compact
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int assym_MY_SYMBOL = 3;
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.Ed
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is used to create the following assembler symbol.
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.Bd -literal -offset indent -compact
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#define MY_SYMBOL 0x3
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.Ed
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Note that the size of the symbol is extracted from the
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object file, which means that the symbol may have any type
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that is wide enough to hold the value.
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.Sh SEE ALSO
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.Xr config 8
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.Xr gensetdefs 8
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.Sh AUTHORS
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The
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.Nm
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command was written by
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.An Marcel Moolenaar Aq marcel@FreeBSD.org
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and was based on the
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.Dv gensetdefs
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command.
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.Sh BUGS
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Not all linkers store the size of the symbol in the ELF
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object file.
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The GNU linker for Alpha has this bug for
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example (binutils 2.9.1). In those cases the size of the
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symbol is assumed to be equal to the word size of the ELF
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object file.
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For Alpha this is 64 bits and for i386 this
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is 32 bits.
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.Sh HISTORY
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The
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.Nm
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command first appeared in
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.Fx 4.0 .
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@ -1,271 +0,0 @@
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/*-
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* Copyright (c) 1999 Marcel Moolenaar
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* All rights reserved.
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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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* in this position and unchanged.
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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. The name of the author may not be used to endorse or promote products
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* derived from this software withough specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#if defined(arch_i386)
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#include <sys/elf32.h>
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#define __ELF_WORD_SIZE 32
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#elif defined(arch_alpha) || defined(arch_sparc64)
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#include <sys/elf64.h>
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#define __ELF_WORD_SIZE 64
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#else
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#error unknown or missing architecture
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#endif
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#include <sys/elf_generic.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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const char s_data[] = ".data";
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const char s_strtab[] = ".strtab";
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const char s_symtab[] = ".symtab";
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const char assym[] = "assym_";
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int fd;
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char *objfile;
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Elf_Ehdr ehdr;
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Elf_Shdr *shdr;
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char *shstr;
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int
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my_byte_order(void)
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{
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static unsigned short s = 0xbbaa;
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int byte0;
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byte0 = *(unsigned char *)&s;
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if (byte0 == 0xaa)
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return (ELFDATA2LSB);
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else if (byte0 == 0xbb)
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return (ELFDATA2MSB);
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return (ELFDATANONE);
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}
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void *
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read_section(int index)
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{
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void *buf;
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size_t size;
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ssize_t bytes;
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size = shdr[index].sh_size;
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buf = malloc(size);
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if (buf == NULL)
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return (NULL);
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if (lseek(fd, shdr[index].sh_offset, SEEK_SET) == -1)
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return (NULL);
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bytes = read(fd, buf, size);
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if (bytes == -1)
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return (NULL);
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if (bytes != size)
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warnx("%s: section %d partially read", objfile, index);
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return (buf);
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}
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int section_index(const char *section)
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{
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int i;
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for (i = 1; i < ehdr.e_shnum; i++)
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if (!strcmp(section, shstr + shdr[i].sh_name))
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return (i);
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return (-1);
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}
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char *
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filter(char *name)
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{
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char *dot;
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name += sizeof(assym) - 1;
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dot = strchr(name, '.');
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if (dot != NULL)
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*dot = '\0';
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return (name);
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}
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void usage(void)
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{
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fprintf(stderr, "usage: genassym [-o outfile] objfile\n");
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exit(1);
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/* NOT REACHED */
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}
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int
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main(int argc, char *argv[])
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{
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Elf_Sym *sym;
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char *data, *name, *symbols;
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char *outfile;
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void *valp;
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size_t size;
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ssize_t bytes;
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int ch, i, numsym, warn_ld_bug;
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int si_data, si_strtab, si_symtab;
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u_int64_t value;
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outfile = NULL;
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warn_ld_bug = 1;
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while ((ch = getopt(argc, argv, "o:")) != -1) {
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switch (ch) {
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case 'o':
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outfile = optarg;
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break;
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default:
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usage();
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/* NOT REACHED */
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}
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}
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argc -= optind;
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argv += optind;
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if (argc == 0) {
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usage();
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/* NOT REACHED */
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}
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if (argc > 1)
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warnx("ignoring trailing arguments");
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objfile = argv[0];
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fd = open(objfile, O_RDONLY);
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if (fd == -1)
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err(1, "%s", objfile);
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bytes = read(fd, &ehdr, sizeof(ehdr));
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if (bytes == -1)
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err(1, "%s", objfile);
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if (bytes != sizeof(ehdr) ||
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ehdr.e_ident[EI_MAG0] != ELFMAG0 ||
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ehdr.e_ident[EI_MAG1] != ELFMAG1 ||
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ehdr.e_ident[EI_MAG2] != ELFMAG2 ||
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ehdr.e_ident[EI_MAG3] != ELFMAG3)
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errx(1, "%s: not an ELF file", objfile);
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if (ehdr.e_ident[EI_VERSION] != EV_CURRENT)
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errx(1, "%s: unsupported ELF version", objfile);
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if (ehdr.e_ident[EI_DATA] != my_byte_order())
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errx(1, "%s: unsupported byte order", objfile);
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if (ehdr.e_shoff == 0)
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errx(1, "%s: no section table", objfile);
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if (ehdr.e_shstrndx == SHN_UNDEF)
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errx(1, "%s: no section name string table", objfile);
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size = sizeof(*shdr) * ehdr.e_shnum;
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shdr = malloc(size);
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if (shdr == NULL)
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err(1, "malloc");
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if (lseek(fd, ehdr.e_shoff, SEEK_SET) == -1)
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err(1, "%s", objfile);
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bytes = read(fd, shdr, size);
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if (bytes == -1)
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err(1, "%s", objfile);
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if (bytes != size)
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errx(1, "%s: truncated section table", objfile);
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shstr = read_section(ehdr.e_shstrndx);
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if (shstr == NULL)
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err(1, "%s[%d]", objfile, ehdr.e_shstrndx);
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si_data = section_index(s_data);
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if (si_data == -1)
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errx(1, "%s: section %s not present", objfile, s_data);
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data = read_section(si_data);
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if (data == NULL)
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err(1, "%s[%d]", objfile, si_data);
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si_strtab = section_index(s_strtab);
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if (si_strtab == -1)
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errx(1, "%s: section %s not present", objfile, s_strtab);
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symbols = read_section(si_strtab);
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if (symbols == NULL)
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err(1, "%s[%d]", objfile, si_strtab);
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si_symtab = section_index(s_symtab);
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if (si_symtab == -1)
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errx(1, "%s: section %s not present", objfile, s_symtab);
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sym = read_section(si_symtab);
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if (sym == NULL)
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err(1, "%s[%d]", objfile, si_symtab);
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numsym = shdr[si_symtab].sh_size / sizeof(*sym);
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if (outfile != NULL)
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freopen(outfile, "w", stdout);
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for (i = 0; i < numsym; i++) {
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name = symbols + sym[i].st_name;
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if (sym[i].st_shndx == si_data &&
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!strncmp(name, assym, sizeof(assym) - 1)) {
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valp = (void*)(data + sym[i].st_value);
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/*
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* XXX - ld(1) on Alpha doesn't store the size of
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* the symbol in the object file. The following
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* fix handles this case quite genericly. It
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* assumes that the symbols have the same size as
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* a word on that architecture, determined by the
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* word size in the ELF object file.
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*/
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if (sym[i].st_size == 0) {
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sym[i].st_size = __ELF_WORD_SIZE >> 3;
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if (warn_ld_bug) {
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warnx("%s: symbol sizes not properly"
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" set", objfile);
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warn_ld_bug = 0;
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}
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}
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switch (sym[i].st_size) {
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case 1:
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value = *(u_int8_t*)valp;
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break;
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case 2:
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value = *(u_int16_t*)valp;
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break;
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case 4:
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value = *(u_int32_t*)valp;
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break;
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case 8:
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value = *(u_int64_t*)valp;
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break;
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default:
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warnx("unsupported size (%lld) for symbol %s",
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(long long)sym[i].st_size, filter(name));
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continue;
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}
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fprintf(stdout, "#define\t%s 0x%llx\n", filter(name),
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(long long)value);
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}
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}
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return (0);
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}
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