Alan Modra [Wed, 4 Jan 2023 11:13:54 +0000 (21:43 +1030)]
asan: segv in parse_module
* vms-alpha.c (parse_module): Ignore DST__K_SRC_SETFILE data
if out of range.
Alan Modra [Wed, 4 Jan 2023 11:09:54 +0000 (21:39 +1030)]
addr2line out of memory on fuzzed file
Another case of fuzzers finding the section size sanity checks are
avoided with SHT_NOBITS sections.
* dwarf2.c (read_section): Check that the DWARF section being
read has contents.
Andrew Burgess [Wed, 4 Jan 2023 11:36:57 +0000 (11:36 +0000)]
gdb: fix some #ifdef logic in bt-utils.h
In passing I spotted some incorrect #ifdef logic in bt-utils.h. The
logic in question has existed since the file was originally added in
commit:
commit
abbbd4a3e0ca51132e7fb31a43f896d29894dae0
Date: Wed Aug 11 13:24:33 2021 +0100
gdb: use libbacktrace to create a better backtrace for fatal signals
The code is trying to select between using libbacktrace or using the
execinfo supplied backtrace API.
First we check to see if we can use libbacktrace. If we can then we
include some header files, and then set some defines to indicate that
libbacktrace is being used.
Then we check if execinfo is available, if it is then we include
<execinfo.h> and set some alternative defines.
In theory the second block of logic should not trigger if the first
block (that uses libbacktrace) has also triggered, but we incorrectly
check the define 'PRINT_BACKTRACE_ON_FATAL_SIGNAL' instead of checking
for 'GDB_PRINT_INTERNAL_BACKTRACE_USING_LIBBACKTRACE', so the second
block triggers more than it should. The
'PRINT_BACKTRACE_ON_FATAL_SIGNAL' define is not defined anywhere, this
was a mistake in the original commit.
In reality this is harmless, we include <execinfo.h> when we don't
need too, but in by-utils.c the libbacktrace define is always checked
for before the execinfo define, so we never actually end up using the
execinfo path (when libbacktrace is available). But I figure its
still worth cleaning this up.
I've tested GDB in a "default" build where libbacktrace is used, and
when configuring with --disable-libbacktrace which causes the execinfo
backtrace API to be used instead, both still appear to work fine.
There should be no user visible changes after this commit.
Bruno Larsen [Thu, 3 Nov 2022 09:17:36 +0000 (10:17 +0100)]
gdb: add 'maintenance print record-instruction' command
While chasing some reverse debugging bugs, I found myself wondering what
was recorded by GDB to undo and redo a certain instruction. This commit
implements a simple way of printing that information.
If there isn't enough history to print the desired instruction (such as
when the user hasn't started recording yet or when they request 2
instructions back but only 1 was recorded), GDB warns the user like so:
(gdb) maint print record-instruction
Not enough recorded history
If there is enough, GDB prints the instruction like so:
(gdb) maint print record-instruction
4 bytes of memory at address 0x00007fffffffd5dc changed from: 01 00 00 00
Register eflags changed: [ IF ]
Register rip changed: (void (*)()) 0x401115 <main+15>
Approved-by: Eli Zaretskii <eliz@gnu.org>
Reviewed-by: Alexandra Hajkova <ahajkova@redhat.com>
Reviewed-by: Lancelot Six <lsix@lancelotsix.com>
Approved-by: Tom Tromey <tom@tromey.com>
Andreas K. Huettel [Wed, 4 Jan 2023 09:30:14 +0000 (09:30 +0000)]
Fix AArch64 linker testsuite failures trigeered by differences in build environments.
PR 29843
* testsuite/ld-aarch64/bti-plt-5.d: Relax regxps slightly to allow
for differences in build environments.
* testsuite/ld-aarch64/tls-relax-gdesc-le-now.d: Likewise.
Mark Harmstone [Sat, 31 Dec 2022 20:55:46 +0000 (20:55 +0000)]
Avoid unaligned pointer reads in PEP .idata section
This is something I discovered when working on aarch64, though it's
relevant to x86_64 too.
The PE32+ imports are located in the .idata section, which starts off
with a 20-byte structure for each DLL, containing offsets into the rest
of the section. This is the Import Directory Table in
https://learn.microsoft.com/en-us/windows/win32/debug/pe-format, which
is a concatenation of the .idata$2 sections. This is then followed by an
20 zero bytes generated by the linker script, which calls this .idata$3.
After this comes the .idata$4 entries for each function, which the
loader overwrites with the function pointers. Because there's no padding
between .idata$3 and .idata$4, this means that if there's an even number
of DLLs, the function pointers won't be aligned on an 8-byte boundary.
Misaligned reads are slower on x86_64, but this is more important on
aarch64, as the e.g. `ldr x0, [x0, :lo12:__imp__func]` the compiler
might generate requires __imp__func (the .idata$4 entry) to be aligned
to 8 bytes. Without this you get IMAGE_REL_ARM64_PAGEOFFSET_12L overflow
errors.
Alan Modra [Wed, 4 Jan 2023 02:52:55 +0000 (13:22 +1030)]
Merge config/picflag.m4 from gcc
and regen libiberty/configure
Tsukasa OI [Wed, 4 Jan 2023 01:38:30 +0000 (01:38 +0000)]
sim: Regenerate using the maintainer mode
Those files have changed by regenerating using the maintainer mode.
The first line of sim/ppc/pk.h have changed by an effect of the commit
319e41e83a40 ("sim: ppc: inline the sim-packages option").
GDB Administrator [Wed, 4 Jan 2023 00:00:12 +0000 (00:00 +0000)]
Automatic date update in version.in
Max Filippov [Tue, 3 Jan 2023 06:56:28 +0000 (22:56 -0800)]
opcodes: xtensa: fix jump visualization for FLIX
opcodes/
* xtensa-dis.c (print_insn_xtensa): Add local variables
insn_type, target and imm_pcrel to track control flow across
multiple slots.
Max Filippov [Tue, 3 Jan 2023 05:17:53 +0000 (21:17 -0800)]
opcodes: xtensa: implement styled disassembly
opcodes/
* xtensa-dis.c (print_xtensa_operand)
(print_insn_xtensa): Replace fprintf_func with
fprintf_styled_func.
Tom Tromey [Thu, 8 Sep 2022 16:35:09 +0000 (10:35 -0600)]
Add test case for "finish" with variably-sized types
This adds a test case for "finish" with variably-sized types, and for
inferior calls as well. This also extends the "runto" proc to handle
temporary breakpoints.
Tom Tromey [Wed, 7 Sep 2022 20:01:13 +0000 (14:01 -0600)]
Use value_at_non_lval in get_call_return_value
get_call_return_value can handle RETURN_VALUE_STRUCT_CONVENTION,
because the call is completely managed by gdb. However, it does not
handle variably-sized types correctly. The simplest way to fix this
is to use value_at_non_lval, which does type resolution.
Tom Tromey [Wed, 7 Sep 2022 15:52:44 +0000 (09:52 -0600)]
Fix inferior calls with variably-sized return type
This patch updates the gdbarch_return_value_as_value implementations
to work correctly with variably-sized return types.
Tom Tromey [Fri, 9 Sep 2022 12:39:56 +0000 (06:39 -0600)]
Convert selected architectures to gdbarch_return_value_as_value
This converts a few selected architectures to use
gdbarch_return_value_as_value rather than gdbarch_return_value. The
architectures are just the ones that I am able to test. This patch
should not introduce any behavior changes.
Tom Tromey [Thu, 15 Sep 2022 18:06:02 +0000 (12:06 -0600)]
Don't let property evaluation affect the current language
On PPC, we saw that calling an inferior function could sometimes
change the current language, because gdb would select the call dummy
frame -- associated with _start.
This patch changes gdb so that the current language is never affected
by DWARF property evaluation.
Tom Tromey [Fri, 9 Sep 2022 18:50:33 +0000 (12:50 -0600)]
Introduce value_at_non_lval
In some cases, while a value might be read from memory, gdb should not
record the value as being equivalent to that memory.
In Ada, the inferior call code will call ada_convert_actual -- and
here, if the argument is already in memory, that address will simply
be reused. However, for a call like "f(g())", the result of "g" might
be on the stack and thus overwritten by the call to "f".
This patch introduces a new function that is like value_at but that
ensures that the result is non-lvalue.
Tom Tromey [Wed, 7 Sep 2022 14:58:18 +0000 (08:58 -0600)]
Don't emit gdbarch_return_value
The previous patch introduced a new overload of gdbarch_return_value.
The intent here is that this new overload always be called by the core
of gdb -- the previous implementation is effectively deprecated,
because a call to the old-style method will not work with any
converted architectures (whereas calling the new-style method is will
delegate when needed).
This patch changes gdbarch.py so that the old gdbarch_return_value
wrapper function can be omitted. This will prevent any errors from
creeping in.
Tom Tromey [Wed, 7 Sep 2022 14:39:52 +0000 (08:39 -0600)]
Add new overload of gdbarch_return_value
The gdbarch "return_value" can't correctly handle variably-sized
types. The problem here is that the TYPE_LENGTH of such a type is 0,
until the type is resolved, which requires reading memory. However,
gdbarch_return_value only accepts a buffer as an out parameter.
Fixing this requires letting the implementation of the gdbarch method
resolve the type and return a value -- that is, both the contents and
the new type.
After an attempt at this, I realized I wouldn't be able to correctly
update all implementations (there are ~80) of this method. So,
instead, this patch adds a new method that falls back to the current
method, and it updates gdb to only call the new method. This way it's
possible to incrementally convert the architectures that I am able to
test.
Tom Tromey [Tue, 6 Sep 2022 14:44:52 +0000 (08:44 -0600)]
Fix crash in amd64-tdep.c
amd64-tdep.c could crash when 'finish'ing from a function whose return
type had variable length. In this situation, the value will be passed
by reference, and this patch avoids the crash.
(Note that this does not fully fix the bug reported, but it does fix
the crash, so it seems worthwhile to land independently.)
Tom de Vries [Tue, 3 Jan 2023 15:41:05 +0000 (16:41 +0100)]
[gdb/testsuite] Add xfail in gdb.arch/i386-pkru.exp
On a x86_64-linux machine with pkru register, I run into:
...
(gdb) PASS: gdb.arch/i386-pkru.exp: set pkru value
info register pkru^M
pkru 0x12345678
305419896^M
(gdb) FAIL: gdb.arch/i386-pkru.exp: read value after setting value
...
This is a regression due to kernel commit
e84ba47e313d ("x86/fpu: Hook up PKRU
onto ptrace()"). This is fixed by recent kernel commit
4a804c4f8356
("x86/fpu: Allow PKRU to be (once again) written by ptrace.").
The regression occurs for kernel versions v5.14-rc1 (the first tag containing
the regression) up to but excluding v6.2-rc1 (the first tag containing the fix).
Fix this by adding an xfail for the appropriate kernel versions.
Tested on x86_64-linux.
PR testsuite/29790
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29790
Tom Tromey [Tue, 3 Jan 2023 14:13:01 +0000 (07:13 -0700)]
Do not use PyObject_CallNoArgs
PyObject_CallNoArgs was introduced in Python 3.9, so avoid it in favor
of PyObject_CallObject.
Himal [Tue, 3 Jan 2023 12:07:16 +0000 (12:07 +0000)]
Fix a potential problem in the BFD library when accessing the Windows' nul device driver.
PR 29947
* bfdio.c (_bfd_real_fopen): Do not add a prefix to the Windows'
nul device filename.
Nick Clifton [Tue, 3 Jan 2023 12:03:02 +0000 (12:03 +0000)]
Fix a translation problem in the x86 assembler.
PR 29952
* config/tc-i386.c (md_assemble): Avoid constructing translatable
strings.
Nick Clifton [Tue, 3 Jan 2023 11:32:42 +0000 (11:32 +0000)]
Updated translations for various languages and sub-directories
Luis Machado [Tue, 3 Jan 2023 11:15:26 +0000 (11:15 +0000)]
Add new NT_ARM_ZA and NT_ARM_SSVE register set constants.
Andrew Burgess [Tue, 3 Jan 2023 09:18:48 +0000 (10:18 +0100)]
[gdb] Fix segfault during inferior call to ifunc
With a simple test-case:
...
$ cat test.c
char *p = "a";
int main (void) {
return strlen (p);
}
$ gcc -g test.c
...
we run into this segfault:
...
$ gdb -q -batch a.out -ex start -ex "p strlen (p)"
Temporary breakpoint 1 at 0x1151: file test.c, line 4.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Temporary breakpoint 1, main () at test.c:4
4 return strlen (p);
Fatal signal: Segmentation fault
...
The strlen is an ifunc, and consequently during the call to
call_function_by_hand_dummy for "p strlen (p)" another call
to call_function_by_hand_dummy is used to resolve the ifunc.
This invalidates the get_current_frame () result in the outer call.
Fix this by using prepare_reinflate and reinflate.
Note that this series (
https://inbox.sourceware.org/gdb-patches/
20221214033441.499512-1-simon.marchi@polymtl.ca/ )
should address this problem, but this patch is a simpler fix which is easy to
backport.
Tested on x86_64-linux.
Co-Authored-By: Tom de Vries <tdevries@suse.de>
PR gdb/29941
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29941
Mike Frysinger [Tue, 3 Jan 2023 03:48:13 +0000 (22:48 -0500)]
sim: sh: move some generated source files to built sources
This should have been part of the previous commit
80636a54bcfa2bca3dc8f
("sim: build: move generated headers to built sources"), but they were
missed because they're .c files effectively treated as .h files.
Mike Frysinger [Tue, 3 Jan 2023 03:40:49 +0000 (22:40 -0500)]
sim: build: add var for tracking sim enable directly
Rather than rely on SIM_SUBDIRS being set, add a dedicated variable
to track whether to enable the sim. While the current code works
fine, it won't work as we remove the recursive make logic (i.e. the
SIM_SUBDIRS variable).
Mike Frysinger [Mon, 2 Jan 2023 19:17:56 +0000 (14:17 -0500)]
sim: common: drop libcommon.a linkage
All of these objects should be in libsim.a already, so don't link to
it too. In practice it never gets used, but no point in listing it.
Mike Frysinger [Tue, 3 Jan 2023 02:16:19 +0000 (21:16 -0500)]
sim: build: move generated headers to built sources
Automake's automatic header deptracking has a bootstrap problem where
it can't detect generated headers when compiling. We've been handling
that by adding a custom SIM_ALL_RECURSIVE_DEPS variable, but that only
works when building objects recursively in subdirs. As we move those
out to the top-level, we don't have any recursive steps anymore. The
Automake approach is to declare those headers in BUILT_SOURCES.
This isn't completely foolproof as the Automake manual documents: it
only activates for `make all`, not `make foo.o`, but that shouldn't be
a huge limitation as it only affects the initial compile. After that,
rebuilds should work fine.
Mike Frysinger [Mon, 2 Jan 2023 02:35:08 +0000 (21:35 -0500)]
sim: cgen: drop common subdir build rules
Now that everything has been hoisted to the top-level, we can delete
this unused logic.
Mike Frysinger [Mon, 2 Jan 2023 02:32:29 +0000 (21:32 -0500)]
sim: or1k: hoist cgen rules to top-level
Mike Frysinger [Mon, 2 Jan 2023 02:31:01 +0000 (21:31 -0500)]
sim: m32r: hoist cgen rules to top-level
Mike Frysinger [Mon, 2 Jan 2023 02:29:19 +0000 (21:29 -0500)]
sim: lm32: hoist cgen rules to top-level
Mike Frysinger [Mon, 2 Jan 2023 02:20:36 +0000 (21:20 -0500)]
sim: iq2000: hoist cgen rules to top-level
Mike Frysinger [Mon, 2 Jan 2023 02:18:50 +0000 (21:18 -0500)]
sim: frv: hoist cgen rules to top-level
Mike Frysinger [Mon, 2 Jan 2023 02:15:02 +0000 (21:15 -0500)]
sim: cris: hoist cgen rules to top-level
Mike Frysinger [Mon, 2 Jan 2023 02:00:12 +0000 (21:00 -0500)]
sim: bpf: hoist cgen rules to top-level
Mike Frysinger [Mon, 2 Jan 2023 01:11:01 +0000 (20:11 -0500)]
sim: cgen: hoist rules to the top-level build
The rules seem to generate the same output as existing subdir cgen
rules with cgen ports, so hopefully this should be correct. These
are the last set of codegen rules that we run in subdirs, so this
will help unblock killing off subdir builds entirely.
Mike Frysinger [Tue, 3 Jan 2023 00:30:22 +0000 (19:30 -0500)]
sim: build: use Automake include vars
Rather than define our own hack for emitting an include statement,
use the existing Automake include variables. These have the nice
side-effect of being more portable.
GDB Administrator [Tue, 3 Jan 2023 00:00:11 +0000 (00:00 +0000)]
Automatic date update in version.in
Tom Tromey [Mon, 2 Jan 2023 17:37:15 +0000 (10:37 -0700)]
Simplify debug_exp
debug_exp should call expression::dump rather than using the 'op'
member.
Tom Tromey [Thu, 23 Jun 2022 17:11:36 +0000 (11:11 -0600)]
Initial implementation of Debugger Adapter Protocol
The Debugger Adapter Protocol is a JSON-RPC protocol that IDEs can use
to communicate with debuggers. You can find more information here:
https://microsoft.github.io/debug-adapter-protocol/
Frequently this is implemented as a shim, but it seemed to me that GDB
could implement it directly, via the Python API. This patch is the
initial implementation.
DAP is implemented as a new "interp". This is slightly weird, because
it doesn't act like an ordinary interpreter -- for example it doesn't
implement a command syntax, and doesn't use GDB's ordinary event loop.
However, this seemed like the best approach overall.
To run GDB in this mode, use:
gdb -i=dap
The DAP code will accept JSON-RPC messages on stdin and print
responses to stdout. GDB redirects the inferior's stdout to a new
pipe so that output can be encapsulated by the protocol.
The Python code uses multiple threads to do its work. Separate
threads are used for reading JSON from the client and for writing JSON
to the client. All GDB work is done in the main thread. (The first
implementation used asyncio, but this had some limitations, and so I
rewrote it to use threads instead.)
This is not a complete implementation of the protocol, but it does
implement enough to demonstrate that the overall approach works.
There is a rudimentary test suite. It uses a JSON parser written in
pure Tcl. This parser is under the same license as Tcl itself, so I
felt it was acceptable to simply import it into the tree.
There is also a bit of documentation -- just documenting the new
interpreter name.
Jonas Hoerberg [Thu, 22 Dec 2022 15:22:17 +0000 (15:22 +0000)]
Fix target remote pipe command for MinGW
The
cced7cacecad104fff0 ("gdb: preserve `|` in connection details string")
commit added '|' detection and removal to ser-pipe.c, but missed to add it
to ser-mingw.c.
This results in the error message below for MinGW hosts:
error starting child process '| <executable> <args>': CreateProcess: No such file or directory
This commit add the missing '|' detection and removal to ser-mingw.c.
Tom Tromey [Wed, 21 Dec 2022 20:57:45 +0000 (13:57 -0700)]
Remove target: prefix from gdb_sysroot in find_separate_debug_file
I noticed that, when using gdbserver, gdb might print:
Reading /usr/lib/debug/lib64//libcap.so.2.48-2.48-4.fc36.x86_64.debug from remote target...
Reading target:/usr/lib/debug/lib64//libcap.so.2.48-2.48-4.fc36.x86_64.debug from remote target...
The second line has the "target:" prefix, but from the code it's clear
that this string is being passed verbatim to gdbserver -- which seems
wrong.
I filed PR remote/29929 for this.
The problem here is that find_separate_debug_file uses gdb_sysroot
without checking to see if it starts with the "target:" prefix. This
patch changes this code to be a little more careful.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29929
Tom de Vries [Mon, 2 Jan 2023 10:59:17 +0000 (11:59 +0100)]
[gdb/testsuite] Fix gdb.python/py-breakpoint.exp with libstdc++ debug info
On x86_64-linux, I run into:
...
(gdb) python hbp1 = gdb.Breakpoint("add", type=gdb.BP_HARDWARE_BREAKPOINT)^M
Hardware assisted breakpoint 2 at 0x40072e: add. (7 locations)^M
(gdb) FAIL: gdb.python/py-breakpoint.exp: test_hardware_breakpoints: \
Set hardware breakpoint
...
due to libstdc++ debug info:
...
$ gdb -q -batch outputs/gdb.python/py-breakpoint/py-breakpoint \
-ex start \
-ex "b add" \
-ex "info break"
Temporary breakpoint 1 at 0x40076a: file py-breakpoint.c, line 50.
Temporary breakpoint 1, main (argc=1, argv=$hex) at py-breakpoint.c:50
50 int foo = 5;
Breakpoint 2 at 0x40072e: add. (7 locations)
Num Type Disp Enb Address What
2 breakpoint keep y <MULTIPLE>
2.1 y 0x000000000040072e in add(int) at \
py-breakpoint.c:39
2.2 y 0x00007ffff7b131de in \
(anonymous namespace)::fast_float::bigint::add at \
../../../../../libstdc++-v3/src/c++17/fast_float/fast_float.h:1815
...
2.7 y 0x00007ffff7b137e4 in \
(anonymous namespace)::fast_float::bigint::add at \
../../../../../libstdc++-v3/src/c++17/fast_float/fast_float.h:1815
...
Fix this by using qualified=True.
Tested on x86_64-linux.
PR testsuite/29910
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29910
Mike Frysinger [Sun, 1 Jan 2023 15:07:28 +0000 (10:07 -0500)]
sim: replace -I$srcroot/bfd include with -I$srcroot
Clean up includes a bit by making ports include bfd/ headers
explicitly. This matches other projects, and makes it more clear
where these headers are coming from.
Mike Frysinger [Sun, 1 Jan 2023 14:55:07 +0000 (09:55 -0500)]
sim: replace -I$srcroot/opcodes include with -I$srcroot
Clean up includes a bit by making ports include opcodes/ headers
explicitly. This matches other projects, and makes it more clear
where these headers are coming from.
Alan Modra [Fri, 23 Dec 2022 07:13:21 +0000 (17:43 +1030)]
obsolete target tidy
Delete a few files only used for obsolete targets, and tidy config,
xfails and other pieces of support specific to those targets. And
since I was editing target triplets in test files, fix the nm
alpha-linuxecoff fails.
GDB Administrator [Mon, 2 Jan 2023 00:00:08 +0000 (00:00 +0000)]
Automatic date update in version.in
Mike Frysinger [Sun, 1 Jan 2023 22:46:15 +0000 (17:46 -0500)]
sim: build: drop unused SIM_EXTRA_LIBS
Now that all run binaries are linked in the topdir, this subdir libs
variable isn't used anywhere, so punt it.
Mike Frysinger [Sun, 1 Jan 2023 22:43:25 +0000 (17:43 -0500)]
sim: erc32: drop -I$(srcroot)
Since the port doesn't actually use this include, drop it.
No other port is doing this either.
Mike Frysinger [Sun, 1 Jan 2023 22:35:16 +0000 (17:35 -0500)]
sim: drop mention of & support for subdir configure
Now that no ports use these common configure APIs, delete the logic
and remove it from the documentation.
Mike Frysinger [Sun, 1 Jan 2023 20:09:19 +0000 (15:09 -0500)]
sim: refresh copyright dates a bit
Update a few files that were missed, and revert the generated Automake
output that uses dates from Automake itself.
Mike Frysinger [Sun, 1 Jan 2023 19:40:03 +0000 (14:40 -0500)]
sim: or1k: drop unused rules
These rules are the same as the common ones, so drop them to simplify.
Mike Frysinger [Sun, 1 Jan 2023 19:05:57 +0000 (14:05 -0500)]
sim: iq2000: drop unused cpu define logic
These defines seem to have been added in anticipation of adding another
cpu port (IQ10BF?), but that was over 20 years ago, and that port has
yet to materialize. So drop these compile flags since they don't do
anything to the generated code. If another port ever shows up, it's
easy enough to readd things as needed.
Joel Brobecker [Sun, 1 Jan 2023 12:52:30 +0000 (16:52 +0400)]
manual copyright year range of various GDB files to add 2023
This commit updates the following file...
gdb/doc/gdb.texinfo
gdb/doc/refcard.tex
gdb/syscalls/update-netbsd.sh
... by hand as instructed by the gdb/copyright.py script.
The update by hand is needed because the copyright headers
to update are actually nested inside those files, rather
than located at the start of the file.
Joel Brobecker [Sun, 1 Jan 2023 12:49:04 +0000 (16:49 +0400)]
Update copyright year range in header of all files managed by GDB
This commit is the result of running the gdb/copyright.py script,
which automated the update of the copyright year range for all
source files managed by the GDB project to be updated to include
year 2023.
Joel Brobecker [Sun, 1 Jan 2023 12:47:26 +0000 (16:47 +0400)]
gdb/copyright.py: Adjust following rename of sim/ppc/ppc-instructions...
... to sim/ppc/powerpc.igen
This file is in the NOT_FSF_LIST because this file has a copyright
which is not assigned to the FSF. Since the file got renamed,
the corresponding entry in NOT_FSF_LIST needs to be renamed as well.
Joel Brobecker [Sun, 1 Jan 2023 12:43:39 +0000 (16:43 +0400)]
Update copyright year in help message of gdb, gdbserver, gdbreplay
This commit updates the copyright year displayed by gdb, gdbserver
and gdbreplay's help message from 2022 to 2023, as per our Start
of New Year procedure. The corresponding source files' copyright
header are also updated accordingly.
Alan Modra [Sun, 1 Jan 2023 12:31:20 +0000 (23:01 +1030)]
Update year range in gprofng copyright notices
This adds 'Innovative Computing Labs' as an external author to
update-copyright.py, to cover the copyright notice in
gprofng/common/opteron_pcbe.c, and uses that plus another external
author 'Oracle and' to update gprofng copyright dates. I'm not going
to commit 'Oracle and' as an accepted author, but that covers the
string "Copyright (c) 2006, 2012, Oracle and/or its affiliates. All
rights reserved." found in gprofng/testsuite/gprofng.display/jsynprog
files.
Alan Modra [Sun, 1 Jan 2023 06:08:42 +0000 (16:38 +1030)]
Update year range in copyright notice of binutils files
The newer update-copyright.py fixes file encoding too, removing cr/lf
on binutils/bfdtest2.c and ld/testsuite/ld-cygwin/exe-export.exp, and
embedded cr in binutils/testsuite/binutils-all/ar.exp string match.
Alan Modra [Sun, 1 Jan 2023 06:03:14 +0000 (16:33 +1030)]
Update etc/update-copyright.py
This picks up some improvements from gcc/contrib. exceptions must
derive from BaseException, port to python3, retain original file mode,
fix name of script in examples.
Adds libsframe to list of default dirs. I would have added gprofng
too but there are some files claiming copyright by authors other than
the Free Software Foundation.
GDB Administrator [Sun, 1 Jan 2023 00:00:10 +0000 (00:00 +0000)]
Automatic date update in version.in
Nick Clifton [Sat, 31 Dec 2022 13:01:40 +0000 (13:01 +0000)]
Update version numbers in howto-make-a-release document
Nick Clifton [Sat, 31 Dec 2022 12:23:00 +0000 (12:23 +0000)]
Update version number and regenerate files
Nick Clifton [Sat, 31 Dec 2022 12:05:28 +0000 (12:05 +0000)]
Add markers for 2.40 branch
Nick Clifton [Sat, 31 Dec 2022 12:03:16 +0000 (12:03 +0000)]
sync libiberty sources with gcc mainline
Tom de Vries [Sat, 31 Dec 2022 09:23:06 +0000 (10:23 +0100)]
[gdb/cli] Add maintenance ignore-probes
There's a command "disable probes", but SystemTap probes, for instance
libc:longjmp cannot be disabled:
...
$ gdb -q -batch a.out -ex start -ex "disable probes libc ^longjmp$"
...
Probe libc:longjmp cannot be disabled.
Probe libc:longjmp cannot be disabled.
Probe libc:longjmp cannot be disabled.
...
Add a command "maintenance ignore-probes" that ignores probes during
get_probes, such that we can easily pretend to use a libc without the
libc:longjmp probe:
...
(gdb) maint ignore-probes -verbose libc ^longjmp$
ignore-probes filter has been set to:
PROVIDER: 'libc'
PROBE_NAME: '^longjmp$'
OBJNAME: ''
(gdb) start ^M
...
Ignoring SystemTap probe libc longjmp in /lib64/libc.so.6.^M
Ignoring SystemTap probe libc longjmp in /lib64/libc.so.6.^M
Ignoring SystemTap probe libc longjmp in /lib64/libc.so.6.^M
...
The "Ignoring ..." messages can be suppressed by not using -verbose.
Note that as with "disable probes", running simply "maint ignore-probes"
ignores all probes.
The ignore-probes filter can be reset by using:
...
(gdb) maint ignore-probes -reset
ignore-probes filter has been reset
...
For now, the command is only supported for SystemTap probes.
PR cli/27159
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=27159
Mark Harmstone [Mon, 26 Dec 2022 20:47:51 +0000 (20:47 +0000)]
ld/testsuite: Don't add index to sizes in pdb.exp
Mark Harmstone [Mon, 26 Dec 2022 20:47:50 +0000 (20:47 +0000)]
ld: Handle LF_VFTABLE types in PDBs
Mark Harmstone [Mon, 26 Dec 2022 20:47:49 +0000 (20:47 +0000)]
ld: Handle extended-length data structures in PDB types
A few fixes to minor issues I've discovered in my PDB patches.
* If sizes or offsets are greater than 0x8000, they get encoded as
extended values in the same way as for enum values - e.g. a LF_ULONG
.short followed by a .long.
* I've managed to coax MSVC to produce another type, LF_VFTABLE, which
is seen when dealing with COM. I don't think LLVM emits this. Note that
we can't just implement everything in Microsoft's header files, as most
of it is obsolete.
* Fixes a stupid bug in the test program, where I was adding an index to
a size. The index was hard-coded to 0, so this didn't cause any actual
issues.
Nick Clifton [Sat, 31 Dec 2022 08:55:31 +0000 (08:55 +0000)]
Updated Romanian translation for the binutils sub-directory
Tom de Vries [Sat, 31 Dec 2022 07:51:40 +0000 (08:51 +0100)]
[gdb/python] Fix gdb.python/py-finish-breakpoint2.exp for -m32
[ Partial resubmission of an earlier submission by Andrew (
https://sourceware.org/pipermail/gdb-patches/2012-September/096347.html ), so
listing him as co-author. ]
With x86_64-linux and target board unix/-m32, we have:
...
(gdb) continue^M
Continuing.^M
Exception #10^M
^M
Breakpoint 3, throw_exception_1 (e=10) at py-finish-breakpoint2.cc:23^M
23 throw new int (e);^M
(gdb) FAIL: gdb.python/py-finish-breakpoint2.exp: \
check FinishBreakpoint in catch()
...
The following scenario happens:
- set breakpoint in throw_exception_1, a function that throws an exception
- continue
- hit breakpoint, with call stack main.c:38 -> throw_exception_1
- set a finish breakpoint
- continue
- hit the breakpoint again, with call stack main.c:48 -> throw_exception
-> throw_exception_1
Due to the exception, the function call did not properly terminate, and the
finish breakpoint didn't trigger. This is expected behaviour.
However, the intention is that gdb detects this situation at the next stop
and calls the out_of_scope callback, which would result here in this test-case
in a rather confusing "exception did not finish" message. So the problem is
that this message doesn't show up, in other words, the out_of_scope callback
is not called.
[ Note that the fact that the situation is detected only at the next stop
(wherever that happens to be) could be improved upon, and the earlier
submission did that by setting a longjmp breakpoint. But I'm considering this
problem out-of-scope for this patch. ]
Note that the message does show up later, at thread exit:
...
[Inferior 1 (process 20046) exited with code 0236]^M
exception did not finish ...^M
...
The decision on whether to call the out_of_scope call back is taken in
bpfinishpy_detect_out_scope_cb, and the interesting bit is here:
...
if (b->pspace == current_inferior ()->pspace
&& (!target_has_registers ()
|| frame_find_by_id (b->frame_id) == NULL))
bpfinishpy_out_of_scope (finish_bp);
...
In the case of the thread exit, the callback triggers because
target_has_registers () == 0.
So why doesn't the callback trigger in the case of the breakpoint?
Well, the b->frame_id is the frame_id of the frame of main (the frame
in which the finish breakpoint is supposed to trigger), so AFAIU
frame_find_by_id (b->frame_id) == NULL will only be true once we've
left main, at which point I guess we don't stop till thread exit.
Fix this by saving the frame in which the finish breakpoint was created, and
using frame_find_by_id () == NULL on that frame instead, such that we have:
...
(gdb) continue^M
Continuing.^M
Exception #10^M
^M
Breakpoint 3, throw_exception_1 (e=10) at py-finish-breakpoint2.cc:23^M
23 throw new int (e);^M
exception did not finish ...^M
(gdb) FAIL: gdb.python/py-finish-breakpoint2.exp: \
check FinishBreakpoint in catch()
...
Still, the test-case is failing because it's setup to match the behaviour that
we get on x86_64-linux with target board unix/-m64:
...
(gdb) continue^M
Continuing.^M
Exception #10^M
stopped at ExceptionFinishBreakpoint^M
(gdb) PASS: gdb.python/py-finish-breakpoint2.exp: \
check FinishBreakpoint in catch()
...
So what happens here? Again, due to the exception, the function call did not
properly terminate, but the finish breakpoint still triggers. This is somewhat
unexpected. This happens because it just so happens to be that the frame
return address at which the breakpoint is set, is also the first instruction
after the exception has been handled. This is a know problem, filed as
PR29909, so KFAIL it, and modify the test-case to expect the out_of_scope
callback.
Also add a breakpoint after setting the finish breakpoint but before throwing
the exception, to check that we don't call the out_of_scope callback too early.
Tested on x86_64-linux, with target boards unix/-m32.
Co-Authored-By: Andrew Burgess <aburgess@redhat.com>
PR python/27247
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=27247
Tom de Vries [Sat, 31 Dec 2022 06:35:56 +0000 (07:35 +0100)]
[gdb/testsuite] Fix gdb.base/print-symbol-loading.exp on ubuntu 22.04.1
On ubuntu 22.04.1 x86_64, I run into:
...
(gdb) PASS: gdb.base/print-symbol-loading.exp: shlib off: \
set print symbol-loading off
sharedlibrary .*^M
Symbols already loaded for /lib/x86_64-linux-gnu/libc.so.6^M
Symbols already loaded for /lib/x86_64-linux-gnu/libpthread.so.0^M
(gdb) FAIL: gdb.base/print-symbol-loading.exp: shlib off: load shared-lib
...
The test-case expects the libc.so line, but not the libpthread.so line.
However, we have:
...
$ ldd /lib/x86_64-linux-gnu/libc.so.6
linux-vdso.so.1 (0x00007ffd7f7e7000)
libgtk3-nocsd.so.0 => /lib/x86_64-linux-gnu/libgtk3-nocsd.so.0 (0x00007f4468c00000)
/lib64/ld-linux-x86-64.so.2 (0x00007f4469193000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f4468f3e000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f4468f39000)
...
so it's not unexpected that libpthread.so is loaded if libc.so is loaded.
Fix this by accepting the libpthread.so line.
Tested on x86_64-linux.
PR testsuite/29919
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29919
Tom de Vries [Sat, 31 Dec 2022 06:31:17 +0000 (07:31 +0100)]
[gdb/testsuite] Replace deprecated pthread_yield in gdb.threads/watchpoint-fork.exp
On Ubuntu 22.04.1 x86_64, with glibc 2.35 I run into:
...
watchpoint-fork-mt.c: In function 'start':^M
watchpoint-fork-mt.c:67:7: warning: 'pthread_yield' is deprecated: \
pthread_yield is deprecated, use sched_yield instead \
[-Wdeprecated-declarations]^M
67 | i = pthread_yield ();^M
| ^^M
...
Fix this as suggested, by using sched_yield instead.
Tested on x86_64-linux.
Tom de Vries [Sat, 31 Dec 2022 06:26:53 +0000 (07:26 +0100)]
[gdb/testsuite] Fix gdb.base/corefile.exp with glibc 2.35
On Ubuntu 22.04.1 x86_64 (with glibc 2.35), I run into:
...
(gdb) PASS: gdb.base/corefile.exp: $_exitcode is void
bt^M
#0 __pthread_kill_implementation (...) at ./nptl/pthread_kill.c:44^M
#1 __pthread_kill_internal (...) at ./nptl/pthread_kill.c:78^M
#2 __GI___pthread_kill (...) at ./nptl/pthread_kill.c:89^M
#3 0x00007f4985e1a476 in __GI_raise (...) at ../sysdeps/posix/raise.c:26^M
#4 0x00007f4985e007f3 in __GI_abort () at ./stdlib/abort.c:79^M
#5 0x0000556b4ea4b504 in func2 () at gdb.base/coremaker.c:153^M
#6 0x0000556b4ea4b516 in func1 () at gdb.base/coremaker.c:159^M
#7 0x0000556b4ea4b578 in main (...) at gdb.base/coremaker.c:171^M
(gdb) PASS: gdb.base/corefile.exp: backtrace
up^M
#1 __pthread_kill_internal (...) at ./nptl/pthread_kill.c:78^M
78 in ./nptl/pthread_kill.c^M
(gdb) FAIL: gdb.base/corefile.exp: up
...
The problem is that the regexp used here:
...
gdb_test "up" "#\[0-9\]* *\[0-9xa-fH'\]* in .* \\(.*\\).*" "up"
...
does not fit the __pthread_kill_internal line which lacks the instruction
address due to inlining.
Fix this by making the regexp less strict.
Tested on x86_64-linux.
GDB Administrator [Sat, 31 Dec 2022 00:00:10 +0000 (00:00 +0000)]
Automatic date update in version.in
Tom de Vries [Fri, 30 Dec 2022 15:53:51 +0000 (16:53 +0100)]
[gdb/testsuite] Fix gdb.threads/dlopen-libpthread.exp for upstream glibc
On ubuntu 22.04.1 x86_64, I run into:
...
(gdb) info probes all rtld rtld_map_complete^M
No probes matched.^M
(gdb) XFAIL: gdb.threads/dlopen-libpthread.exp: info probes all rtld rtld_map_complete
UNTESTED: gdb.threads/dlopen-libpthread.exp: no matching probes
...
This has been filed as PR testsuite/17016.
The problem is that the name rtld_map_complete is used, which was only
available in Fedora 17, and upstream the name map_complete was used.
In the email thread discussing a proposed patch (
https://sourceware.org/legacy-ml/gdb-patches/2014-09/msg00712.html ) it was
suggested to make the test-case handle both names.
So, handle both names: map_complete and rtld_map_complete.
This exposes the following FAIL:
...
(gdb) info sharedlibrary^M
From To Syms Read Shared Object Library^M
$hex $hex Yes /lib64/ld-linux-x86-64.so.2^M
$hex $hex Yes (*) /lib/x86_64-linux-gnu/libgtk3-nocsd.so.0^M
$hex $hex Yes /lib/x86_64-linux-gnu/libc.so.6^M
$hex $hex Yes /lib/x86_64-linux-gnu/libdl.so.2^M
$hex $hex Yes /lib/x86_64-linux-gnu/libpthread.so.0^M
(*): Shared library is missing debugging information.^M
(gdb) FAIL: gdb.threads/dlopen-libpthread.exp: libpthread.so not found
...
due to using a glibc (v2.35) that has libpthread integrated into libc.
Fix this by changing the FAIL into UNSUPPORTED.
Tested on x86_64-linux.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=17016
Tom de Vries [Fri, 30 Dec 2022 15:48:07 +0000 (16:48 +0100)]
[gdb/testsuite] Fix gdb.reverse/step-indirect-call-thunk.exp with -fcf-protection
On Ubuntu 22.04.1 x86_64, I run into:
...
gdb.reverse/step-indirect-call-thunk.c: In function 'inc':^M
gdb.reverse/step-indirect-call-thunk.c:22:1: error: '-mindirect-branch' and \
'-fcf-protection' are not compatible^M
22 | { /* inc.1 */^M
| ^^M
...
Fix this by forcing -fcf-protection=none, if supported.
Tested on x86_64-linux.
Tom de Vries [Fri, 30 Dec 2022 13:00:39 +0000 (14:00 +0100)]
[gdb/testsuite] Fix gdb.cp/step-and-next-inline.exp with -fcf-protection
On Ubuntu 22.04.1 x86_64, I run into:
...
(gdb) PASS: gdb.cp/step-and-next-inline.exp: no_header: not in inline 1
next^M
51 if (t != NULL^M
(gdb) FAIL: gdb.cp/step-and-next-inline.exp: no_header: next step 1
...
This is due to -fcf-protection, which adds the endbr64 at the start of get_alias_set:
...
0000000000001180 <_Z13get_alias_setP4tree>:
1180: f3 0f 1e fa endbr64
1184: 48 85 ff test %rdi,%rdi
...
so the extra insn gets an is-stmt line number entry:
...
INDEX LINE ADDRESS IS-STMT PROLOGUE-END
...
11 50 0x0000000000001180 Y
12 50 0x0000000000001180
13 51 0x0000000000001184 Y
14 54 0x0000000000001184
...
and when stepping into get_alias_set we step to line 50:
...
(gdb) PASS: gdb.cp/step-and-next-inline.exp: no_header: in main
step^M
get_alias_set (t=t@entry=0x555555558018 <xx>) at step-and-next-inline.cc:50^M
50 {^M
...
In contrast, with -fcf-protection=none, we get:
...
0000000000001170 <_Z13get_alias_setP4tree>:
1170: 48 85 ff test %rdi,%rdi
...
and:
...
INDEX LINE ADDRESS IS-STMT PROLOGUE-END
...
11 50 0x0000000000001170 Y
12 51 0x0000000000001170 Y
13 54 0x0000000000001170
...
so when stepping into get_alias_set we step to line 51:
...
(gdb) PASS: gdb.cp/step-and-next-inline.exp: no_header: in main
step^M
get_alias_set (t=t@entry=0x555555558018 <xx>) at step-and-next-inline.cc:51^M
51 if (t != NULL^M
...
Fix this by rewriting the gdb_test issuing the step command to check which
line the step lands on, and issuing an extra next if needed.
Tested on x86_64-linux, both with and without -fcf-protection=none.
PR testsuite/29920
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29920
Tom de Vries [Fri, 30 Dec 2022 12:55:22 +0000 (13:55 +0100)]
[gdb/symtab] Make comp_unit_head.length private
Make comp_unit_head.length private, to enforce using accessor functions.
Replace accessor function get_length with get_length_with_initial and
get_length_without_initial, to make it explicit which variant we're using.
Tested on x86_64-linux.
PR symtab/29343
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29343
Alan Modra [Fri, 30 Dec 2022 01:11:16 +0000 (11:41 +1030)]
PR29948, heap-buffer-overflow in display_debug_lines_decoded
This fixes a couple of places in display_debug_lines_decoded that were
off by one in checking DWARF5 .debug_line directory indices. It also
displays the DWARF5 entry 0 for the program current directory rather
than "." as is done for pre-DWARF5. I decided against displaying
DW_AT_comp_dir for pre-DWARF5 since I figure it is better for readelf
to minimally interpret debug info.
binutils/
PR 29948
* dwarf.c (display_debug_lines_decoded): Display the given
directory entry 0 for DWARF5. Properly check directory index
against number of entries in the table. Revert to using
unsigned int for n_directories and associated variables.
Correct warning messages.
gas/
* testsuite/gas/elf/dwarf-5-loc0.d: Update.
GDB Administrator [Fri, 30 Dec 2022 00:00:09 +0000 (00:00 +0000)]
Automatic date update in version.in
Tsukasa OI [Tue, 27 Dec 2022 03:31:19 +0000 (03:31 +0000)]
RISC-V: Simplify riscv_csr_address logic on state enable extensions
This commit makes CSR class handling for 'Smstateen' and 'Ssstateen'
extensions simpler using fall-throughs (as used in CSR_CLASS_I{,_32}).
gas/ChangeLog:
* config/tc-riscv.c (riscv_csr_address): Simplify the logic for
'Smstateen' and 'Ssstateen' extensions.
GDB Administrator [Thu, 29 Dec 2022 00:00:12 +0000 (00:00 +0000)]
Automatic date update in version.in
Tom Tromey [Wed, 28 Dec 2022 17:07:45 +0000 (10:07 -0700)]
Use $decimal in timestamp.exp
This patch fixes a review comment by Tom de Vries. He pointed out
that the new timestamp.exp should use the $decimal convenience regexp.
Tom Tromey [Tue, 27 Dec 2022 23:34:44 +0000 (16:34 -0700)]
Fix "set debug timestamp"
PR cli/29945 points out that "set debug timestamp 1" stopped working
-- this is a regression due to commit
b8043d27 ("Remove a ui-related
memory leak").
This patch fixes the bug and adds a regression test.
I think this should probably be backported to the gdb 13 branch.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29945
GDB Administrator [Wed, 28 Dec 2022 00:00:08 +0000 (00:00 +0000)]
Automatic date update in version.in
H.J. Lu [Tue, 27 Dec 2022 19:41:11 +0000 (11:41 -0800)]
x86-64: Allocate input section memory if needed
When --no-keep-memory is used, the input section memory may not be cached.
Allocate input section memory for -z pack-relative-relocs if needed.
bfd/
PR ld/29939
* elfxx-x86.c (elf_x86_size_or_finish_relative_reloc): Allocate
input section memory if needed.
ld/
PR ld/29939
* testsuite/ld-elf/dt-relr-2i.d: New test.
Christoph Müllner [Fri, 16 Dec 2022 18:44:07 +0000 (19:44 +0100)]
RISC-V: Fix T-Head Fmv vendor extension encoding
A recent change in the XTheadFmv spec fixed an encoding bug in the
document. This patch changes the code to follow this bugfix.
Spec patch can be found here:
https://github.com/T-head-Semi/thead-extension-spec/pull/11
Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>
Tom Tromey [Thu, 15 Dec 2022 21:12:05 +0000 (14:12 -0700)]
Handle SIGSEGV in gdb selftests
The gdb.gdb self-tests were timing out for me, which turned out to be
PR testsuite/29325. Looking into it, the problem is that the version
of the Boehm GC that is used by Guile on my machine causes a SEGV
during stack probing. This unexpected stop confuses the tests and
causes repeated timeouts.
This patch adapts the two failing tests. This makes them work for me,
and reduces the running time of gdb.gdb from 20 minutes to about 11
seconds.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29325
Mike Frysinger [Sun, 25 Dec 2022 18:46:30 +0000 (13:46 -0500)]
sim: build: clean up unused codegen logic
Now that all igen ports are in the top-level makefile, we don't need
this logic in any subdirs anymore, so clean it up.
Mike Frysinger [Sun, 25 Dec 2022 08:13:24 +0000 (03:13 -0500)]
sim: mips: hoist "multi" igen rules up to common builds
Since these are the last mips igen rules, we can clean up a number of
bits in the local Makefile.in.
Mike Frysinger [Sun, 25 Dec 2022 07:50:07 +0000 (02:50 -0500)]
sim: mips: hoist "m16" igen rules up to common builds
Mike Frysinger [Sun, 25 Dec 2022 07:48:36 +0000 (02:48 -0500)]
sim: mips: hoist "single" igen rules up to common builds
Mike Frysinger [Sun, 25 Dec 2022 07:37:10 +0000 (02:37 -0500)]
sim: mips: rename "igen" generation mode to "single"
The naming in here has grown organically and is confusing to follow.
Originally there was only one set of rules for generating code from
the igen sources, so calling it "tmp-igen" and such made sense. But
when other multigen modes were added ("m16" & "multi") which also
used igen, it's not clear what's common igen and what's specific to
this generation mode. So rename the set of rules from "igen" to
"single" so it's easier to follow.
Mike Frysinger [Sun, 25 Dec 2022 07:25:47 +0000 (02:25 -0500)]
sim: mips: hoist itable igen rules up to common builds
Since this rule is pretty simple, hoist it up to the common build.
Mike Frysinger [Sun, 25 Dec 2022 06:48:01 +0000 (01:48 -0500)]
sim: mips: unify itable generation (a bit)
The m16 & multi targets generate itable once even when all the other
modules are generated multiple times. The default igen target will
generate itable with everything else out of convenience. This means
flags are passed which don't affect the generated itable there.
We can unify the itable generation by making sure the right -F/-M
filter variables are passed down. Since there's already a dedicated
rule & variable in the multi build mode, generalize that and switch
the m16 & igen builds over too.
I spent a lot of time staring at this code, building for diff mips
targets, and exploring all the shell code paths. I think this is
safe, but only time (and users) will really tell.