Date: Mon, 02 Feb 1998 18:31:43 +0100 From: "Helmut F. Wirth" <hfwirth@eunet.at> To: emulation@FreeBSD.ORG Subject: Cross debugging Linux binaries under FreeBSD, instructions Message-ID: <34D602FF.167EB0E7@eunet.at>
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Hello!
I promised detailed instructions to build gdb for ELF and for Linux.
Here we go:
1) Get binutils-2.8.1 and install them, where it is convinient for you.
You also need the ports linux-devel and linux-libs. Both are
binary only and are easy to install. You should now have
/compat/linux/... containing libraries, include files and cross
development tools.
2) We use the original FreeBSD-current sources of gdb:
cd to binutils-2.8.1; there are some subdirectories (binutils, bfd,
gas, ...). Make two new directories:
mkdir gdb buildgdb.
Now copy parts the systems gdb sources into these directories:
(cd /usr/src/contrib/gdb; tar cf -)|(cd
<wherever>/bintuils-2.8.1;
tar xf -)
This copies the basic sources to binutils-2.8.1/gdb. You need only
the subdirectory gdb from /usr/src/contrib/gdb! This leaves behind
the old bfd library and the rest. Important: After the copy
go to binutils-2.8.1/gdb and delete the configuration files:
configure, configure.in config.status config.log and config.cache.
*Do not remove* config.h and the subdir config. This step is
neccessary, because configure of the entire binutils tree would
generate some files in the subdirectory gdb (tm.h, nm.h and xm.h)
and this is unwanted. These files are in buildgdb and are the
original native files from FreeBSD.
Next step: Copy the native files and the Makefile, again we only
need the gdb subdirectory !
(cd /usr/src/gnu/usr.bin/gdb/gdb; tar cf - *) |
(cd<wherever>/binutils-2.8.1/buildgdb;tar xf -)
This brings the Makefile and the native sources to buildgdb.
3) Install patches to the following files in binutils-2.8.1/gdb (All
patches are included at the end of this mail as shell archive):
solib.c: -> patch with solib-patch
utils.c: -> patch with utils-patch
4) Install patches to the following files in binutils-2.8.1/buildgdb:
Makefile: -> patch with Makefile-patch
nm.h: -> patch with nm-patch
5) Now configure the binutils:
configure
-host=-host=i386-unknown-freebsd3.0-target=i386-unknown-freebsdelf
If you want to use them for the elfkit too, add the option
-prefix /usr/local/elf (See John Poltra's elfkit and the
instructions there. It is not neccessary to have the elfkit.
The configure configures the package for elf binaries.
6) In binutils-2.8.1 do a make. This should build the libraries, the
assembler, the linker and the tools. The assembler supports MMX, btw.
I am using it instead of the older assembler in the linux_devel, but
I am not sure if this works in all cases. This is more a cross tool,
not the old Linux assembler of the linux_devel port. I don't think
the linker will work in this configuration.
7) Now you have to build gdb, manually: cd to buildgdb. Have a look at
the Makefile. After the patch you will find a line:
#CFLAGS+=-DLINUX_CROSS_GDB
If you do not enable the line, gdb will build and it will even debug
Linux binaries, but only if they are statically linked. This version
of gdb is useful for elfkit: It is configured to debug FreeBSD native
programs, but as ELF binaries (I have not tested this well, yet).
If you enable the line, gdb is built for Linux cross debugging:
It should work with statically and dynamically linked Linux programs.
Don't forget branding the binaries using brandelf -t Linux xxx!!
If the Linux emulator is not loaded or you try to use an unbranded
binary, gdb won't recognize it as an executable!
8) Manually install gdb as linux-gdb into the /compat/linux tree.
9) If you want to try it, build without LINUX_CROSS_GDB and install this
as elf-gdb into the elfkit.
If somebody points me to a ftp server I will put the binary for gdb
onto it.
Helmut
--
Helmut F. Wirth
Email: hfwirth@ping.at
--------------794BDF32446B9B3D2781E494
Content-Type: application/x-shar; name="gdbpatch.shar"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="gdbpatch.shar"
# This is a shell archive. Save it in a file, remove anything before
# this line, and then unpack it by entering "sh file". Note, it may
# create directories; files and directories will be owned by you and
# have default permissions.
#
# This archive contains:
#
# Makefile-patch
# nm-patch
# solib-patch
# utils-patch
#
echo x - Makefile-patch
sed 's/^X//' >Makefile-patch << 'END-of-Makefile-patch'
Xdiff -c --recursive /usr/src/gnu/usr.bin/gdb/gdb/Makefile ./Makefile
X*** /usr/src/gnu/usr.bin/gdb/gdb/Makefile Sun Feb 1 23:41:10 1998
X--- ./Makefile Mon Feb 2 17:09:48 1998
X***************
X*** 2,10 ****
X
X PROG = gdb
X
X! GDBDIR= ${.CURDIR}/../../../../contrib/gdb
X! .PATH: ${GDBDIR}/gdb
X! .PATH: ${GDBDIR}/opcodes
X
X BINDIR= /usr/bin
X XSRCS = annotate.c blockframe.c breakpoint.c buildsym.c c-lang.c \
X--- 2,10 ----
X
X PROG = gdb
X
X! GDBDIR= ${.CURDIR}/../gdb
X! .PATH: ${GDBDIR}
X! .PATH: ${.CURDIR}/../opcodes
X
X BINDIR= /usr/bin
X XSRCS = annotate.c blockframe.c breakpoint.c buildsym.c c-lang.c \
X***************
X*** 32,42 ****
X XSRCS+= i386-dis.c dis-buf.c disassemble.c
X SRCS= init.c ${XSRCS}
X
X! CFLAGS+= -g -I$(.CURDIR) -I${DESTDIR}/usr/include/readline -I$(.CURDIR)/../bfd
X # use phkmalloc
X CFLAGS+= -DNO_MMALLOC
X # uncomment the next line if you want to debug gdb
X #CFLAGS+= -g
X
X CLEANFILES+= c-exp.c f-exp.c m2-exp.c init.c y.tab.h init.c-tmp
X #beforedepend: c-exp.c f-exp.c m2-exp.c init.c
X--- 32,44 ----
X XSRCS+= i386-dis.c dis-buf.c disassemble.c
X SRCS= init.c ${XSRCS}
X
X! CFLAGS+= -I$(GDBDIR) -I${DESTDIR}/usr/include/readline -I$(.CURDIR)/../bfd
X! CFLAGS+= -I$(.CURDIR)/../include -I$(GDBDIR)/config -I$(.CURDIR)
X # use phkmalloc
X CFLAGS+= -DNO_MMALLOC
X # uncomment the next line if you want to debug gdb
X #CFLAGS+= -g
X+ #CFLAGS+= -DLINUX_CROSS_GDB
X
X CLEANFILES+= c-exp.c f-exp.c m2-exp.c init.c y.tab.h init.c-tmp
X #beforedepend: c-exp.c f-exp.c m2-exp.c init.c
END-of-Makefile-patch
echo x - nm-patch
sed 's/^X//' >nm-patch << 'END-of-nm-patch'
Xdiff -c --recursive /usr/src/gnu/usr.bin/gdb/gdb/nm.h ./nm.h
X*** /usr/src/gnu/usr.bin/gdb/gdb/nm.h Fri Aug 22 20:16:01 1997
X--- ./nm.h Mon Feb 2 16:32:59 1998
X***************
X*** 23,29 ****
X--- 23,33 ----
X #define ATTACH_DETACH
X
X /* Be shared lib aware */
X+ /* For Linux debugging under FreeBSD we use SVR4 shared libs */
X #include "solib.h"
X+ #ifdef LINUX_CROSS_GDB
X+ #define SVR4_SHARED_LIBS
X+ #endif
X
X /* This is the amount to subtract from u.u_ar0
X to get the offset in the core file of the register values. */
X***************
X*** 42,47 ****
X--- 46,52 ----
X
X #define PTRACE_ARG3_TYPE char*
X
X+ #ifndef LINUX_CROSS_GDB
X /* make structure definitions match up with those expected in solib.c */
X #define link_object sod
X #define lo_name sod_name
X***************
X*** 94,99 ****
X--- 99,105 ----
X #define ldd d_debug
X #define ld_un d_un
X #define ld_2 d_sdt
X+ #endif /* ! LINUX_CROSS_GDB */
X
X /* Return sizeof user struct to callers in less machine dependent routines */
X
END-of-nm-patch
echo x - solib-patch
sed 's/^X//' >solib-patch << 'END-of-solib-patch'
Xdiff -c --recursive /usr/src/contrib/gdb/gdb/solib.c ./solib.c
X*** /usr/src/contrib/gdb/gdb/solib.c Fri Aug 22 20:13:12 1997
X--- ./solib.c Mon Feb 2 16:35:11 1998
X***************
X*** 39,45 ****
X--- 39,49 ----
X #include "elf/external.h"
X #endif
X
X+ #ifdef LINUX_CROSS_GDB
X+ #include "/compat/linux/usr/include/link.h"
X+ #else
X #include <link.h>
X+ #endif
X
X #include "symtab.h"
X #include "bfd.h"
X***************
X*** 70,75 ****
X--- 74,80 ----
X "r_debug_state",
X "_r_debug_state",
X "_dl_debug_state",
X+ "_dl_debug_addr",
X NULL
X };
X #endif
X
END-of-solib-patch
echo x - utils-patch
sed 's/^X//' >utils-patch << 'END-of-utils-patch'
Xdiff -c --recursive /usr/src/contrib/gdb/gdb/utils.c ./utils.c
X*** /usr/src/contrib/gdb/gdb/utils.c Fri Aug 22 20:13:12 1997
X--- ./utils.c Sun Feb 1 23:50:57 1998
X***************
X*** 772,778 ****
X
X PTR
X xmalloc (size)
X! long size;
X {
X return (xmmalloc ((PTR) NULL, size));
X }
X--- 772,778 ----
X
X PTR
X xmalloc (size)
X! size_t size;
X {
X return (xmmalloc ((PTR) NULL, size));
X }
X***************
X*** 782,788 ****
X PTR
X xrealloc (ptr, size)
X PTR ptr;
X! long size;
X {
X return (xmrealloc ((PTR) NULL, ptr, size));
X }
X--- 782,788 ----
X PTR
X xrealloc (ptr, size)
X PTR ptr;
X! size_t size;
X {
X return (xmrealloc ((PTR) NULL, ptr, size));
X }
END-of-utils-patch
exit
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