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GDB that can debug Mach-Os on Linux
90ad5e1d4f
Ref: https://sourceware.org/ml/gdb-patches/2015-03/msg00060.html The record-btrace target can hit an assertion here: Breakpoint 1, record_btrace_fetch_registers (ops=0x974bfc0 <record_btrace_ops>, regcache=0x9a0a798, regno=8) at gdb/record-btrace.c:1202 1202 gdb_assert (tp != NULL); (gdb) p regcache->ptid $3 = {pid = 23856, lwp = 0, tid = 0} The problem is that the linux-nat layer converts the ptid to a single-process ptid before passing the request down to the inf-ptrace layer, which loses information, and then record-btrace can't find the corresponding thread in GDB's thread list: (gdb) bt #0 record_btrace_fetch_registers (ops=0x974bfc0 <record_btrace_ops>, regcache=0x9a0a798, regno=8) at gdb/record-btrace.c:1202 #1 0x083f4ee2 in delegate_fetch_registers (self=0x974bfc0 <record_btrace_ops>, arg1=0x9a0a798, arg2=8) at gdb/target-delegates.c:149 #2 0x08406562 in target_fetch_registers (regcache=0x9a0a798, regno=8) at gdb/target.c:3279 #3 0x08355255 in regcache_raw_read (regcache=0x9a0a798, regnum=8, buf=0xbfffe6c0 "¨\003\222\tÀ8kIøæÿ¿HO5\b\035]") at gdb/regcache.c:643 #4 0x083558a7 in regcache_cooked_read (regcache=0x9a0a798, regnum=8, buf=0xbfffe6c0 "¨\003\222\tÀ8kIøæÿ¿HO5\b\035]") at gdb/regcache.c:734 #5 0x08355de3 in regcache_cooked_read_unsigned (regcache=0x9a0a798, regnum=8, val=0xbfffe738) at gdb/regcache.c:838 #6 0x0827a106 in i386_linux_resume (ops=0x9737ca0 <linux_ops_saved>, ptid=..., step=1, signal=GDB_SIGNAL_0) at gdb/i386-linux-nat.c:670 #7 0x08280c12 in linux_resume_one_lwp (lp=0x9a0a5b8, step=1, signo=GDB_SIGNAL_0) at gdb/linux-nat.c:1529 #8 0x08281281 in linux_nat_resume (ops=0x98da608, ptid=..., step=1, signo=GDB_SIGNAL_0) at gdb/linux-nat.c:1708 #9 0x0850738e in record_btrace_resume (ops=0x98da608, ptid=..., step=1, signal=GDB_SIGNAL_0) at gdb/record-btrace.c:1760 ... The fix is just to not lose information, and let the intact ptid reach record-btrace.c. Tested on x86-64 Fedora 20, -m32. gdb/ChangeLog: 2015-03-03 Pedro Alves <palves@redhat.com> * i386-linux-nat.c (i386_linux_resume): Get the ptrace PID out of the lwp field of ptid. Pass the full ptid to get_thread_regcache. * inf-ptrace.c (get_ptrace_pid): New function. (inf_ptrace_resume): Use it. * linux-nat.c (linux_resume_one_lwp): Pass the LWP's ptid ummodified to the lower layer. |
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bfd | ||
binutils | ||
config | ||
cpu | ||
elfcpp | ||
etc | ||
gas | ||
gdb | ||
gold | ||
gprof | ||
include | ||
intl | ||
ld | ||
libdecnumber | ||
libiberty | ||
opcodes | ||
readline | ||
sim | ||
texinfo | ||
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.gitattributes | ||
.gitignore | ||
ChangeLog | ||
compile | ||
config-ml.in | ||
config.guess | ||
config.rpath | ||
config.sub | ||
configure | ||
configure.ac | ||
COPYING | ||
COPYING3 | ||
COPYING3.LIB | ||
COPYING.LIB | ||
COPYING.LIBGLOSS | ||
COPYING.NEWLIB | ||
depcomp | ||
djunpack.bat | ||
install-sh | ||
libtool.m4 | ||
lt~obsolete.m4 | ||
ltgcc.m4 | ||
ltmain.sh | ||
ltoptions.m4 | ||
ltsugar.m4 | ||
ltversion.m4 | ||
MAINTAINERS | ||
Makefile.def | ||
Makefile.in | ||
Makefile.tpl | ||
makefile.vms | ||
missing | ||
mkdep | ||
mkinstalldirs | ||
move-if-change | ||
README | ||
README-maintainer-mode | ||
setup.com | ||
src-release.sh | ||
symlink-tree | ||
ylwrap |
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.