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2025-06-25gdb: styling fixes around and for the pagination promptAndrew Burgess3-4/+311
This commit fixes a couple of issues relating to the pagination prompt and styling. The pagination prompt is this one: --Type <RET> for more, q to quit, c to continue without paging-- I did try to split this into multiple patches, based on the three issues I describe below, but in the end, the fixes were all too interconnected, so it ended up as one patch that makes two related, but slightly different changes: 1. Within the pager_file class, relying on the m_applied_style attribute of the wrapped m_stream, as is done when calling m_stream->emit_style_escape, is not correct, so stop doing that, and 2. Failing to update m_applied_style within the pager_file class can leave that attribute out of date, which can then lead to styling errors later on, so ensure m_applied_style is always updated. The problems I have seen are: 1. After quitting from a pagination prompt, the next command can incorrectly style its output. This was reported as bug PR gdb/31033, and is fixed by this commit. 2. The pagination prompt itself could be styled. The pagination prompt should always be shown in the default style. 3. After continuing the output at a pagination prompt, GDB can fail to restore the default style the next time the output (within the same command) switches back to the default style. There are tests for all these issues as part of this patch. The pager_file class is a sub-class of wrapped_file, this means that a pager_file is itself a ui_file, while it also manages a pointer to a ui_file object (called m_stream). An instance of pager_file can be installed as the gdb_stdout ui_file object. Output sent to a pager_file is stored within an internal buffer (called m_wrap_buffer) until we have a complete line, when the content is flushed to the wrapped m_stream. If sufficient lines have been written out then the pager_file will present the pagination prompt and allow the user to continue viewing output, or quit the current command. As a pager_file is a ui_file, it has an m_applied_style member variable. The managed stream (m_stream) is also a ui_file, and so also has an m_applied_style member variable. In some places within the pager_file class we attempt to change the current style of the m_stream using calls like this: m_stream->emit_style_escape (style); See pager_file::emit_style_escape, pager_file::prompt_for_continue, and pager_file::puts. These calls will end up in ui_file::emit_style_escape, which tries to skip emitting unnecessary style escapes by checking if the requested style matches the current m_applied_style value. The m_applied_style value is updated by calls to the emit_style_escape function. The problem here is that most of the time pager_file doesn't change the style of m_stream by calling m_stream->emit_style_escape. Most of the time, style changes are performed by pager_file writing the escape sequence into m_wrap_buffer, and then later flushing this buffer to m_stream by calling m_stream->puts. It has to be done this way. Calling m_stream->emit_style_escape would, if it actually changed the style, immediately change the style by emitting an escape sequence. But pager_file doesn't want that, it wants the style change to happen later, when m_wrap_buffer is flushed. To avoid excessive style escape sequences being written into m_wrap_buffer, the pager_file::m_applied_style performs a function similar to the m_applied_style within m_stream, it tracks the current style for the end of m_wrap_buffer, and only allows style escape sequences to be emitted if the style is actually changing. However, a consequence of this is the m_applied_style within m_stream, is not updated, which means it will be out of sync with the actual current style of m_stream. If we then try to make a call to m_stream->emit_style_escape, if the style we are changing too happens to match the out of date style in m_stream->m_applied_style, then the style change will be ignored. And this is indeed what we see in pager_file::prompt_for_continue with the call: m_stream->emit_style_escape (ui_file_style ()); As m_stream->m_applied_style is not being updated, it will always be the default style, however m_stream itself might not actually be in the default style. This call then will not emit an escape sequence as the desired style matches the out of date m_applied_style. The fix in this case is to call m_stream->puts directly, passing in the escape sequence for the desired style. This will result in an immediate change of style for m_stream, which fixes some of the problems described above. In fact, given that m_stream's m_applied_style is always going to be out of sync, I think we should change all of the m_stream->emit_style_escape calls to instead call m_stream->puts. However, just changing to use puts doesn't fix all the problems. I found that, if I run 'apropos time', then quit at the first pagination prompt. If for the next command I run 'maintenance time' I see the expected output: "maintenance time" takes a numeric argument. However, everything after the first double quote is given the command name style rather than only styling the text between the double quotes. Here is GDB's stack while printing the above output: #2 0x0000000001050d56 in ui_out::vmessage (this=0x7fff1238a150, in_style=..., format=0x1c05af0 "", args=0x7fff1238a288) at ../../src/gdb/ui-out.c:754 #3 0x000000000104db88 in ui_file::vprintf (this=0x3f9edb0, format=0x1c05ad0 "\"%ps\" takes a numeric argument.\n", args=0x7fff1238a288) at ../../src/gdb/ui-file.c:73 #4 0x00000000010bc754 in gdb_vprintf (stream=0x3f9edb0, format=0x1c05ad0 "\"%ps\" takes a numeric argument.\n", args=0x7fff1238a288) at ../../src/gdb/utils.c:1905 #5 0x00000000010bca20 in gdb_printf (format=0x1c05ad0 "\"%ps\" takes a numeric argument.\n") at ../../src/gdb/utils.c:1945 #6 0x0000000000b6b29e in maintenance_time_display (args=0x0, from_tty=1) at ../../src/gdb/maint.c:128 The interesting frames here are #3, in here `this` is the pager_file for GDB's stdout, and this passes its m_applied_style to frame #2 as the `in_style` argument. If the m_applied_style is wrong, then frame #2 will believe that the wrong style is currently in use as the default style, and so, after printing 'maintenance time' GDB will switch back to the wrong style. So the question is, why is pager_file::m_applied_style wrong? In pager_file::prompt_for_continue, there is an attempt to switch back to the default style using: m_stream->emit_style_escape (ui_file_style ()); If this is changed to a puts call (see above) then this still leaves pager_file::m_applied_style out of date. The right fix in this case is, I think, to instead do this: this->emit_style_escape (ui_file_style ()); this will update pager_file::m_applied_style, and also send the default style to m_stream using a puts call. While writing the tests I noticed that I was getting unnecessary style reset sequences emitted. The problem is that, around pagination, we don't really know what style is currently applied to m_stream. The pager_file::m_applied_style tracks the style at the end of m_wrap_buffer, but this can run ahead of the current m_stream style. For example, if the screen is currently full, such that the next character of output will trigger the pagination prompt, if the next call is actually to pager_file::emit_style_escape, then pager_file::m_applied_style will be updated, but the style of m_stream will remain unchanged. When the next character is written to pager_file::puts then the pagination prompt will be presented, and GDB will try to switch m_stream back to the default style. Whether an escape is emitted or not will depend on the m_applied_style value, which we know is different than the actual style of m_stream. It is, after all, only when m_wrap_buffer is flushed to m_stream that the style of m_stream actually change. And so, this commit also adds pager_file::m_stream_style. This new variable tracks the current style of m_stream. This really is a replacement for m_stream's ui_file::m_applied_style, which is not accessible from pager_file. When content is flushed from m_wrap_buffer to m_stream then the current value of pager_file::m_applied_style becomes the current style of m_stream. But, when m_wrap_buffer is filling up, but before it is flushed, then pager_file::m_applied_style can change, but m_stream_style will remain unchanged. Now in pager_file::emit_style_escape we are able to skip some of the direct calls to m_stream->puts() used to emit style escapes. After all this there are still a few calls to m_stream->emit_style_escape(). These are all in the wrap_here support code. I think that these calls are technically broken, but don't actually cause any issues due to the way styling works in GDB. I certainly haven't been able to trigger any bugs from these calls yet. I plan to "fix" these in the next commit just for completeness. Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31033 Approved-By: Tom Tromey <tom@tromey.com>
2025-06-25[gdb/testsuite] Fix gdb.python/py-warning.exp with python 3.6Tom de Vries1-3/+20
On openSUSE Tumbleweed (with python 3.13), I get: ... (gdb) PASS: gdb.python/py-warning.exp: python gdb.warning("") python gdb.warning()^M Python Exception <class 'TypeError'>: \ function missing required argument 'text' (pos 1)^M Error occurred in Python: function missing required argument 'text' (pos 1)^M (gdb) PASS: gdb.python/py-warning.exp: python gdb.warning() ... But on openSUSE Leap 15.6 (with python 3.6), I get instead: ... (gdb) PASS: gdb.python/py-warning.exp: python gdb.warning("") python gdb.warning()^M Python Exception <class 'TypeError'>: \ Required argument 'text' (pos 1) not found^M Error occurred in Python: Required argument 'text' (pos 1) not found^M (gdb) FAIL: gdb.python/py-warning.exp: python gdb.warning() ... Fix this by updating the regexp. Tested on x86_64-linux. PR testsuite/33104 Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=33104
2025-06-25[gdb/testsuite] Fix gdb.base/infcall-failure.exp on freebsdTom de Vries1-2/+14
On x86_64-freebsd with test-case gdb.base/infcall-failure.exp I get: ... (gdb) continue Continuing. Program received signal SIGSEGV, Segmentation fault. Address not mapped to object. 0x0000000000400522 in func_segfault () at infcall-failure.c:24 24 return *p; /* Segfault here. */ Error in testing condition for breakpoint 2: The program being debugged was signaled while in a function called from GDB. GDB remains in the frame where the signal was received. To change this behavior use "set unwind-on-signal on". Evaluation of the expression containing the function (func_segfault) will be abandoned. When the function is done executing, GDB will silently stop. (gdb) FAIL: $exp: target_async=on: target_non_stop=on: \ run_cond_hits_segfault_test: continue ... The problem is that the regexp in the test-case doesn't expect the "Address not mapped to object." bit. Fix this by updating the regexp. Approved-by: Kevin Buettner <kevinb@redhat.com> Tested on x86_64-freebsd and x86_64-linux.
2025-06-24[gdb/testsuite] Make gdb.dap/log-message.exp more robustTom de Vries1-0/+9
PR testsuite/31831 reports the following failure in the gdb.dap/log-message.exp test-case (formatted for readability): ... { "type": "event", "event": "output", "body": { "category": "stdout", "output": "Breakpoint 1 at 0x681: file log-message.c, line 23.\n" }, "seq": 13 } FAIL: $exp: logging output (checking body category) ... for a gdb 14.2 based package. The output event listed above is a result from the setBreakpoints request. The test-case issues the setBreakpoints request and waits for the corresponding response, but doesn't wait for the output event, and consequently the output event is read by: ... dap_wait_for_event_and_check "logging output" output \ {body category} console \ {body output} "got 23 - 23 = 0" ... which triggers the failure. I'm not able to reproduce this, but it looks worth fixing regardless. We're fixing this on trunk though, and the output event looks different, and there's one more output event: ... { "type": "event", "event": "output", "body": { "category": "stdout", "output": "No source file named log-message.c.\n" }, "seq": 4 } { "type": "event", "event": "output", "body": { "category": "stdout", "output": "Breakpoint 1 (-source log-message.c -line 23) pending.\n" }, "seq": 5 } ... Fix this by waiting for these two output events, making the test-case a bit more robust. It is possible that one or both of these output events will be read by dap_check_request_and_response "set breakpoint", and in that case restashing them (for which there's currently no infrastructure) would be an easy way of handling this. But I haven't been able to trigger that, so I'm leaving that for if and when it does. Tested on x86_64-linux. Approved-By: Tom Tromey <tom@tromey.com> Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31831
2025-06-24Allow DAP "threads" request when inferior is runningTom Tromey3-9/+162
A user pointed out that DAP allows the "threads" request to work when the inferior is running. This is documented in the overview, not the specification. While looking into this, I found a few other issues: * The _thread_name function was not marked @in_gdb_thread. This isn't very important but is still an oversight. * DAP requires all threads to have a name -- the field is not optional in the "Thread" type. * There was no test examining events resulting from the inferior printing to stdout. This patch fixes all these problems. Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=33080
2025-06-24Use "MS" for .debug_strTom Tromey5-5/+24
I changed my system linker to 'mold', but then I saw some gdb test failures. This patch fixes a subset of the failures. dw2-strp.exp was failing, and investigating showed that there were two .debug_str sections. I tracked this down to the .S file not using the correct section flags. This patch fixes this problem, plus the other instances I could find. (Strangely, these did not all cause problems, however.) I also changed the DWARF assembler to always use these flags for .debug_str.
2025-06-23gdb: return after stack alignment skip if current_pc is reachedPawel Kupczak1-0/+3
Make sure we bail out early from amd64_analyze_prologue if CURRENT_PC is reached to avoid unnecessary call to amd64_analyze_frame_setup. Approved-By: Andrew Burgess <aburgess@redhat.com>
2025-06-23gdb: correct endbr64 instruction handling in amd64_analyze_prologuePawel Kupczak3-27/+79
Compilers can put a sequence aligning the stack at the entry of a function. However with -fcf-protection enabled, "endbr64" is generated before. Current implementation of amd64 prologue analyzer first checks for stack alignment and then for "endbr64", which is not correct. This behavior was introduced with patch "gdb: handle endbr64 instruction in amd64_analyze_prologue". In case both are generated, prologue will not be skipped. This patch swaps the order so that "endbr64" is checked first and adds a regression test. i386-tdep implementation also already had those checked in the correct order, that is stack alignment is after endbr64. Given such source compiled with gcc 11.4.0 via: gcc -O0 main.c -o main ``` #include <alloca.h> void foo (int id) { volatile __attribute__ ((__aligned__ (64))) int a; volatile char *p = (char *) alloca (id * 12); p[2] = 'b'; } int main (int argc, char **argv) { foo (argc + 1); return 1; } ``` we get such function entry for foo (generated with objdump -d): ``` 0000000000001149 <foo>: 1149: f3 0f 1e fa endbr64 114d: 4c 8d 54 24 08 lea 0x8(%rsp),%r10 1152: 48 83 e4 c0 and $0xffffffffffffffc0,%rsp 1156: 41 ff 72 f8 push -0x8(%r10) 115a: 55 push %rbp 115b: 48 89 e5 mov %rsp,%rbp 115e: 41 52 push %r10 1160: 48 81 ec a8 00 00 00 sub $0xa8,%rsp 1167: 89 7d 8c mov %edi,-0x74(%rbp) ... ``` The 3 instructions following endbr64 align the stack. If we were to set a breakpoint on foo, gdb would set it at function's entry: ``` (gdb) b foo Breakpoint 1 at 0x1149 (gdb) r ... Breakpoint 1, 0x0000555555555149 in foo () (gdb) disassemble Dump of assembler code for function foo: => 0x0000555555555149 <+0>: endbr64 0x000055555555514d <+4>: lea 0x8(%rsp),%r10 0x0000555555555152 <+9>: and $0xffffffffffffffc0,%rsp 0x0000555555555156 <+13>: push -0x8(%r10) 0x000055555555515a <+17>: push %rbp 0x000055555555515b <+18>: mov %rsp,%rbp 0x000055555555515e <+21>: push %r10 0x0000555555555160 <+23>: sub $0xa8,%rsp 0x0000555555555167 <+30>: mov %edi,-0x74(%rbp) ... ``` With this patch fixing the order of checked instructions, gdb can properly analyze the prologue: ``` (gdb) b foo Breakpoint 1 at 0x115e (gdb) r ... Breakpoint 1, 0x000055555555515e in foo () (gdb) disassemble Dump of assembler code for function foo: 0x0000555555555149 <+0>: endbr64 0x000055555555514d <+4>: lea 0x8(%rsp),%r10 0x0000555555555152 <+9>: and $0xffffffffffffffc0,%rsp 0x0000555555555156 <+13>: push -0x8(%r10) 0x000055555555515a <+17>: push %rbp 0x000055555555515b <+18>: mov %rsp,%rbp => 0x000055555555515e <+21>: push %r10 0x0000555555555160 <+23>: sub $0xa8,%rsp 0x0000555555555167 <+30>: mov %edi,-0x74(%rbp) ... ``` Approved-By: Andrew Burgess <aburgess@redhat.com>
2025-06-23gdb: refactor amd64_analyze_prologuePawel Kupczak1-51/+75
Refactor amd64_analyze_prologue so it clearly reflects what is the order of operations in the prologue that we expect to encounter, as is the case for i386's implementation. Approved-By: Andrew Burgess <aburgess@redhat.com>
2025-06-23gdb/testsuite: use TESTS from make-check-all.shAndrew Burgess1-2/+2
Update the make-check-all.sh script to use TESTS rather than passing the test names within RUNTESTFLAGS. This addresses the following issue: I was running some tests like this: make -C gdb check-all-boards TESTS="gdb.base/break*.exp" And I was finding that I would get lots of DUPLICATE test results, which is not what I expected. What's happening here is that the 'make check-all-boards' rule runs the 'make-check-all.sh' script, which then runs 'make check' with various board files. However, passing TESTS=... to the initial 'make check-all-boards' command invocation automatically causes the TESTS value to be added to the MAKEFLAGS environment variable, this is then picked up by the later calls to 'make check'. Now, in GDB's testfile/Makefile, we check for TESTS, and if this is set, we expand the value and set `expanded_tests_or_none`. Otherwise, if TESTS is not set, expanded_tests_or_none is left empty. Finally, when handling 'make check', the value of `expanded_tests_or_none` is passed through to dejagnu, along with the RUNTESTFLAGS value. What this means is that, when make-check-all.sh passes the test names in the RUNTESTFLAGS, then dejagnu ends up seeing the list of tests twice, once from RUNTESTFLAGS, and once from expanded_tests_or_none, and this is why I was seeing duplicate testnames. The easiest fix for the above is to have make-check-all.sh pass the test names using TESTS="...", this will override the TESTS="..." value already present in MAKEFLAGS, and means dejagnu will see the test names just once. Additionally, this is a start towards allowing parallel test running from the make-check-all.sh script. Parallel test running only works if the test names are passed in TESTS, and not in RUNTESTFLAGS. Currently, in testsuite/Makefile, if RUNTESTFLAGS is not empty, then we force single threaded test running. But with this change, at least for the `local` board, we can now benefit from multi-threaded test running, as this board has an empty RUNTESTFLAGS now. For the other boards we'd need to set FORCE_PARALLEL in order to benefit from parallel test running, but we'll need to double check that all the board files actually support parallel test running first, so I'm leaving that for another day.
2025-06-23gdb: filename completion for pipe command -- the shell command bitAndrew Burgess2-3/+27
This commit adds filename completion for the shell command part of the pipe command. This is a follow on from this commit: commit 036e5c0c9121d0ac691dbf408a3bdf2bf3501d0f Date: Mon May 19 20:54:54 2025 +0100 gdb: use quoted filename completion for the shell command which fixed the completion for the 'shell' command itself. Like with the 'shell' command, we don't offer completions of command names pulled from $PATH, we just offer filename completion, which is often useful for arguments being passed to commands. Maybe in the future we could add completion for command names too (for both 'pipe' and the 'shell' command), but that is left for a future commit. There's some additional testing.
2025-06-23gdb: linux-namespaces: enter user namespace when appropriateBenjamin Berg3-1/+194
The use of user namespaces is required for normal users to use mount namespaces. Consider trying this as an unprivileged user: $ unshare --mount /bin/true unshare: unshare failed: Operation not permitted The problem here is that an unprivileged user doesn't have the required permissions to create a new mount namespace. If, instead, we do this: $ unshare --mount --map-root-user /bin/true then this will succeed. The new option causes unshare to create a user namespace in which the unprivileged user is mapped to UID/GID 0, and so gains all privileges (inside the namespace), the user is then able to create the mount namespace as required. So, how does this relate to GDB? When a user attaches to a process running in a separate mount namespace, GDB makes use of a separate helper process (see linux_mntns_get_helper in nat/linux-namespaces.c), which will then use the `setns` function to enter (or try to enter) the mount namespace of the process GDB is attaching too. The helper process will then handle file I/O requests received from GDB, and return the results back to GDB, this allows GDB to access files within the mount namespace. The problem here is that, switching to a mount namespace requires that a process hold CAP_SYS_CHROOT and CAP_SYS_ADMIN capabilities within its user namespace (actually it's a little more complex, see 'man 2 setns'). Assuming GDB is running as an unprivileged user, then GDB will not have the required permissions. However, if GDB enters the user namespace that the `unshare` process created, then the current user will be mapped to UID/GID 0, and will have the required permissions. And so, this patch extends linux_mntns_access_fs (in nat/linux-namespace.c) to first try and switch to the user namespace of the inferior before trying to switch to the mount namespace. If the inferior does have a user namespace, and does have elevated privileges within that namespace, then this first switch by GDB will mean that the second step, into the mount namespace, will succeed. If there is no user namespace, or the inferior doesn't have elevated privileges within the user namespace, then the switch into the mount namespace will fail, just as it currently does, and the user will need to give elevated privileges to GDB via some other mechanism (e.g. run as root). This work was originally posted here: https://inbox.sourceware.org/gdb-patches/20230321120126.1418012-1-benjamin@sipsolutions.net I (Andrew Burgess) have made some cleanups to the code to comply with GDB's coding standard, and the test is entirely mine. This commit message is also entirely mine -- the original message was very terse and required the reader to understand how the various namespaces work and interact. The above is my attempt to document what I now understand about the problem being fixed. I've left the original author in place as the core of the GDB change itself is largely as originally presented, but any inaccuracies in the commit message, or problems with the test, are all mine. Co-Authored-by: Andrew Burgess <aburgess@redhat.com>
2025-06-23gdb: only use /proc/PID/exe for local f/s with no sysrootAndrew Burgess4-8/+91
This commit works around a problem introduced by commit: commit e58beedf2c8a1e0c78e0f57aeab3934de9416bfc Date: Tue Jan 23 16:00:59 2024 +0000 gdb: attach to a process when the executable has been deleted The above commit extended GDB for Linux, so that, of the executable for a process had been deleted, GDB would instead try to use /proc/PID/exe as the executable. This worked by updating linux_proc_pid_to_exec_file to introduce the /proc/PID/exe fallback. However, the result of linux_proc_pid_to_exec_file is then passed to exec_file_find to actually find the executable, and exec_file_find, will take into account the sysroot. In addition, if GDB is attaching to a process in a different MNT and/or PID namespace then the executable lookup is done within that namespace. This all means two things: 1. Just because linux_proc_pid_to_exec_file cannot see the executable doesn't mean that GDB is actually going to fail to find the executable, and 2. returning /proc/PID/exe isn't useful if we know GDB is then going to look for this within a sysroot, or within some other namespace (where PIDs might be different). There was an initial attempt to fix this issue here: https://inbox.sourceware.org/gdb-patches/20250511141517.2455092-4-kilger@sec.in.tum.de/ This proposal addresses the issue in PR gdb/32955, which is all about the namespace side of the problem. The fix in this original proposal is to check the MNT namespace inside linux_proc_pid_to_exec_file, and for the namespace problem this is fine. But we should also consider the sysroot problem. And for the sysroot problem, the fix cannot fully live inside linux_proc_pid_to_exec_file, as linux_proc_pid_to_exec_file is shared between GDB and gdbserver, and gdbserver has no sysroot. And so, I propose a slightly bigger change. Now, linux_proc_pid_to_exec_file takes a flag which indicates if GDB (or gdbserver) will look for the inferior executable in the local file system, where local means the same file system as GDB (or gdbserver) is running in. This local file system check is true if: 1. The MNT namespace of the inferior is the same as for GDB, and 2. for GDB only, the sysroot must either be empty, or 'target:'. If the local file system check is false then GDB (or gdbserver) is going to look elsewhere for the inferior executable, and so, falling back to /proc/PID/exe should not be done, as GDB will end up looking for this file in the sysroot, or within the alternative MNT namespace (which in also likely to be a different PID namespace). Now this is all a bit of a shame really. It would be nice if linux_proc_pid_to_exec_file could return /proc/PID/exe in such a way that exec_file_find would know that the file should NOT be looked for in the sysroot, or in the alternative namespace. But fixing that problem would be a much bigger change, so for now lets just disable the /proc/PID/exe fallback for cases where it might not work. For testing, the sysroot case is now tested. I don't believe we have any alternative namespace testing. It would certainly be interesting to add some, but I'm not proposing any with this patch, so the code for checking the MNT namespace has been tested manually by me, but isn't covered by a new test I'm adding here. Author of the original fix is listed as co-author here. Credit for identifying the original problem, and proposing a solution belongs to them. Co-Authored-By: Fabian Kilger <kilger@sec.in.tum.de> Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=32955
2025-06-23gdb: better warning when attaching, and executable is unknownAndrew Burgess1-0/+8
Currently, when attaching to a process, if the user hasn't told GDB which executable they are going to be debugging, GDB will try to figure out the executable from the running process. There are two (for this patch) interesting places where this can fail, both in exec_file_locate_attach. First GDB calls target_pid_to_exec_file, this does target specific "stuff" to find the name of the executable file. If this returns NULL then GDB will give a warning and return. After this we need to "find" the executable. This is where we apply things like the sysroot in order to transform the executable path. This is done by calling exec_file_find, and this too can return NULL to indicate that the executable couldn't be found. Currently, if exec_file_find returns NULL then GDB doesn't give a warning, instead we push on and call try_open_exec_file passing in the NULL pointer as the filename string. This has the effect of removing the current executable from the current program space. However, exec_file_locate_attach already checks there is no executable attached to the current program space. If there was, then there would be no need to try and lookup the executable from the running process. So calling try_open_exec_file with a NULL string is, I claim, pointless. But worse, calling try_open_exec_file with a NULL string means that GDB prints the message: "No executable file now.", which, while correct, isn't (I think) very helpful. To me this message indicates that we've moved from a state of having an executable to a state of not having one, which isn't correct. I think we should introduce a new warning in exec_file_locate_attach, which is printed if the executable cannot be found. So, before this patch GDB's output looked like this: (gdb) attach 12345 Attaching to process 12345 No executable file now. warning: Could not load vsyscall page because no executable was specified 0x00007f0978b94557 in ?? () (gdb) After this patch the output now looks like this: (gdb) attach 12345 Attaching to process 12345 No executable has been specified, and target executable /tmp/my-exec (deleted) could not be found. Try using the "file" command. warning: Could not load vsyscall page because no executable was specified 0x00007f0978b94557 in ?? () (gdb) This warning includes the name of the file that GDB was looking for, and gives a hint that the 'file' command should be used to tell GDB which executable is being debugged. Much better. There's no test for this change in this commit. The next commit fixes another (semi-related) bug, and includes a test that checks for this warning string.
2025-06-20gdb: Remove redundant null checkAleksandar Rikalo1-8/+2
This patch simplifies the code at two points by removing redundant null checks. There is no functional impact. Reviewed-By: Keith Seitz <keiths@redhat.com> Approved-By: Pedro Alves <pedro@palves.net> Change-Id: I76e1c7fad00e8fcb24ced7bfd75d19cdd6266c32
2025-06-20gdbserver: Update require_int function to parse offset for pread packetKirill Radkin2-0/+78
Currently gdbserver uses the require_int() function to parse the requested offset (in vFile::pread packet and the like). This function allows integers up to 0x7fffffff (to fit in 32-bit int), however the offset (for the pread system call) has an off_t type which can be larger than 32-bit. This patch allows require_int() function to parse offset up to the maximum value implied by the off_t type. Approved-By: Pedro Alves <pedro@palves.net> Change-Id: I3691bcc1ab1838c0db7f8b82d297d276a5419c8c
2025-06-19gdb/testsuite: run isort on gdb.server/fileio-packets.pySimon Marchi1-1/+2
`pre-commit run --all-files` found this. Change-Id: I8db09b12cf184d32351ff2c579bdaa8cf6f80ac3
2025-06-19gdb/dwarf: change CUs -> units in print_statsSimon Marchi2-4/+4
Change the messages to reflect that these numbers includes type units, not only compile units. Change-Id: Id2f511d4666e5cf92112be917d72ff76791b7e1d Approved-by: Kevin Buettner <kevinb@redhat.com>
2025-06-19gdb/python: introduce gdb.warning() functionAndrew Burgess5-0/+101
This commit adds a new gdb.warning() function. This function takes a string and then calls GDB's internal warning() function. This will display the string as a warning. Using gdb.warning() means that the message will get the new emoji prefix if the user has that feature turned on. Also, the message will be sent to gdb.STDERR without the user having to remember to print to the correct stream. Reviewed-By: Eli Zaretskii <eliz@gnu.org> Approved-By: Tom Tromey <tom@tromey.com>
2025-06-17gdb: query inferior's filesystem for build-id debug filesFabian Kilger1-2/+4
This fixes a bug related to build-id files with linux namespaces. Specifically, we expect the debug files to be present inside the container, thus the container filesystem should be queried if the program is running inside one. Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=32956 Approved-By: Andrew Burgess <aburgess@redhat.com>
2025-06-17gdb: implement linux namespace support for fileio_lstat and vFile::lstatFabian Kilger4-0/+91
The new algorithm to look for a build-id-based debug file (introduced by commit 22836ca88591ac7efacf06d5b6db191763fd8aba) makes use of fileio_lstat. As lstat was not supported by linux-namespace.c, all lstat calls would be performed on the host and not inside the namespace. Fixed by adding namespace lstat support. Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=32956 Approved-By: Andrew Burgess <aburgess@redhat.com>
2025-06-17gdbserver: fix vFile:stat to actually use 'stat'Andrew Burgess4-7/+60
This commit continues the work of the previous two commits. In the following commits I added the target_fileio_stat function, and the target_ops::fileio_stat member function: * 08a115cc1c4 gdb: add target_fileio_stat, but no implementations yet * 3055e3d2f13 gdb: add GDB side target_ops::fileio_stat implementation * 6d45af96ea5 gdbserver: add gdbserver support for vFile::stat packet * 22836ca8859 gdb: check for multiple matching build-id files Unfortunately I messed up, despite being called 'stat' these function actually performed an 'lstat'. The 'lstat' is the correct (required) implementation, it's the naming that is wrong. Additionally, to support remote targets, these commit added the vFile::stat packet, which again, performed an 'lstat'. In the previous two commits I changed the GDB code to replace 'stat' with 'lstat' in the fileio function names. I then added a new vFile:lstat packet which GDB now uses instead of vFile:stat. And that just leaves the vFile:stat packet which is, right now, performing an 'lstat'. Now, clearly when I wrote this code I fully intended for this packet to perform an lstat, it's the lstat that I needed. But now, I think, we should "fix" vFile:stat to actually perform a 'stat'. This is risky. This is a change in remote protocol behaviour. Reasons why this might be OK: - vFile:stat was only added in GDB 16, so it's not been "in the wild" for too long yet. If we're quick, we might be able to "fix" this before anyone realises I messed up. - The documentation for vFile:stat is pretty vague. It certainly doesn't explicitly say "this does an lstat". Most implementers would (I think), given the name, start by assuming this should be a 'stat' (given the name). Only if they ran the full GDB testsuite, or examined GDB's implementation, would they know to use lstat. Reasons why this might not be OK: - Some other debug client could be connecting to gdbserver, sending vFile:stat and expecting to get lstat behaviour. This would break after this patch. - Some other remote server might have implemented vFile:stat support, and either figured out, or copied, the lstat behaviour from gdbserver. This remote server would technically be wrong after this commit, but as GDB no longer uses vFile:stat, then this will only become a problem if/when GDB or some other client starts to use vFile:stat in the future. Given the vague documentation for vFile:stat, and that it was only added in GDB 16, I think we should fix it now to perform a 'stat', and that is what this commit does. The change in behaviour is documented in the NEWS file. I've improved the vFile:stat documentation in the manual to better explain what is expected from this packet, and I've extended the existing test to cover vFile:stat. Reviewed-By: Eli Zaretskii <eliz@gnu.org> Approved-By: Tom Tromey <tom@tromey.com>
2025-06-17gdbserver: add vFile:lstat packet supportAndrew Burgess6-5/+258
In the following commits I added the target_fileio_stat function, and the target_ops::fileio_stat member function: * 08a115cc1c4 gdb: add target_fileio_stat, but no implementations yet * 3055e3d2f13 gdb: add GDB side target_ops::fileio_stat implementation * 6d45af96ea5 gdbserver: add gdbserver support for vFile::stat packet * 22836ca8859 gdb: check for multiple matching build-id files Unfortunately I messed up, despite being called 'stat' these function actually performed an 'lstat'. The 'lstat' is the correct (required) implementation, it's the naming that is wrong. In the previous commit I fixed the naming within GDB, renaming 'stat' to 'lstat' throughout. However, in order to support target_fileio_stat (as was) on remote targets, the above patches added the vFile:stat packet, which actually performed an 'lstat' call. This is really quite unfortunate, and I'd like to do as much as I can to try and clean up this mess. But I'm mindful that changing packets is not really the done thing. So, this commit doesn't change anything. Instead, this commit adds vFile:lstat as a new packet. Currently, this packet is handled identically as vFile:stat, the packet performs an 'lstat' call. I then update GDB to send the new vFile:lstat instead of vFile:stat for the remote_target::fileio_lstat implementation. After this commit GDB will never send the vFile:stat packet. However, I have retained the 'set remote hostio-stat-packet' control flag, just in case someone was trying to set this somewhere. Then there's one test in the testsuite which used to disable the vFile:stat packet, that test is updated to now disable vFile:lstat. There's a new test that does a more direct test of vFile:lstat. This new test can be extended to also test vFile:stat, but that is left for the next commit. And so, after this commit, GDB sends the new vFile:lstat packet in order to implement target_ops::fileio_lstat. The new packet is more clearly documented than vFile:stat is. But critically, this change doesn't risk breaking any other clients or servers that implement GDB's remote protocol. Reviewed-By: Eli Zaretskii <eliz@gnu.org> Approved-By: Tom Tromey <tom@tromey.com>
2025-06-17gdb: rename target_fileio_stat to target_fileio_lstatAndrew Burgess6-31/+31
In the following commits I added the target_fileio_stat function, and the target_ops::fileio_stat member function: * 08a115cc1c4 gdb: add target_fileio_stat, but no implementations yet * 3055e3d2f13 gdb: add GDB side target_ops::fileio_stat implementation * 6d45af96ea5 gdbserver: add gdbserver support for vFile::stat packet * 22836ca8859 gdb: check for multiple matching build-id files Unfortunately, I messed up when adding this API. The actual underlying call is lstat, not stat. This commit tries to clear up some of the confusion by renaming things to target_fileio_lstat and target_ops::fileio_lstat. After this change the function names now match the underlying implementation. One problem remains though. In order to support target_fileio_stat for remote target the above patches added the vFile:stat packet to GDB and gdbserver. The implementation of this packet still does an lstat though, which is a bit of a shame. I'm going to try and fix that in later commits. This commit is just a rename within GDB, there should be no user visible changes. Approved-By: Tom Tromey <tom@tromey.com>
2025-06-17gdb/dwarf: rename get_cu -> get_unitSimon Marchi4-15/+15
This method returns type units too, so "get_unit" is a better name. Change-Id: I6ec9de3f783637a3e206bcaaec96a4e00b4b7d31 Approved-By: Tom Tromey <tom@tromey.com>
2025-06-17gdb/dap: allow more requests when the process is runningoltolm1-3/+3
Makes it possible to set and remove other types of breakpoints while the process is running. Makes debugging more convenient. Approved-By: Tom Tromey <tom@tromey.com>
2025-06-17gdb/record: Support csrrci instruction in risc-vTimur1-1/+1
During testing csr instructions in risc-v, it occurs that instruction csrrci is unsupported for recording process and there is such warning: 'warning: Currently this instruction with len 4(100174f3) is unsupported', so recording failed. This patch fixes this error.
2025-06-17gdb: add Timur Golubovich to gdb/MAINTAINERStimurgol0071-0/+1
2025-06-17[gdb/testsuite] Set interactive-mode to onTom de Vries1-0/+3
With MSYS2 and test-case gdb.ada/assign_1.exp, we get: ... (gdb) dir^M Reinitialize source path to empty? (y or n) \ [answered Y; input not from terminal]^M^M Source directories searched: $cdir;$cwd^M^M (gdb) ... GDB automatically answers the query, because interactive-mode is off: ... (gdb) show interactive-mode^M Debugger's interactive mode is auto (currently off).^M^M ... The correct value is on, because GDB was started in a terminal. For some reason, the auto value of interactive-mode is off instead. According to this patch [1], gdb doesn't recognize the pipes used by DejaGnu testsuite as an interactive setup. Fix this by adding "set interactive-mode on" to INTERNAL_GDBFLAGS, such that we get: ... (gdb) dir^M Reinitialize source path to empty? (y or n) y^M Source directories searched: $cdir;$cwd^M^M (gdb) ... and no longer need fixes like commit be740e7cc62 ("testsuite: skip confirmation in 'gdb_reinitialize_dir'") The fix is essentially the same as in aforementioned patch. For consistency, we apply the fix for all platforms. Co-Authored-By: Pierre Muller <muller@sourceware.org> Approved-By: Tom Tromey <tom@tromey.com> [1] https://sourceware.org/legacy-ml/gdb-patches/2013-09/msg00940.html
2025-06-17[gdb/testsuite] Set TERM to dumb by defaultTom de Vries1-0/+27
With MSYS2 and default TERM=xterm-256color (as well as with xterm and ansi), I get: ... builtin_spawn gdb -q ... ^[[6n(gdb) ERROR: GDB never initialized. ... This is not specific to gdb, other tools produce the same CSI sequence, and consequently we run into trouble in other places (like get_compiler_info). Fix this by default-setting TERM to dumb. We do this for all platforms, to avoid test-cases passing on one platform but failing on another. For test-cases that set TERM to something other than dumb, handle the CSI sequence in default_gdb_start. Approved-By: Tom Tromey <tom@tromey.com> PR testsuite/33072 Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=33072
2025-06-16gdb/doc: Explain linker namespacesGuinevere Larsen1-8/+15
Recent GDB commits added more features related to linker namespaces and documented them on the manual, but did not add a convenient way for a user to understand what they are. This commit adds a quick explanation of what they are. It also fixes the inconsistency of using "linker namespaces" and "linkage namespaces", by always using the first form to avoid user confusion. Approved-By: Eli Zaretskii <eliz@gnu.org>
2025-06-16gdb/doc: remove stray comma from gdb.flush descriptionAndrew Burgess1-1/+1
Remove comma from: gdb.flush([, stream]) . I suspect this was a copy and paste from gdb.write(string [, stream]) where the comma is correct.
2025-06-16gdb/amd-dbgapi: disable forward progress requirement in ↵Simon Marchi3-0/+160
amd_dbgapi_target_breakpoint::check_status ROCgdb handles target events very slowly when running a test case like this, where a breakpoint is preset on HipTest::vectorADD: for (int i=0; i < numDevices; ++i) { HIPCHECK(hipSetDevice(i)); hipLaunchKernelGGL(HipTest::vectorADD, dim3(blocks), dim3(threadsPerBlock), 0, stream[i], static_cast<const int*>(A_d[i]), static_cast<const int*>(B_d[i]), C_d[i], N); } What happens is: - A kernel is launched - The internal runtime breakpoint is hit during the second hipLaunchKernelGGL call, which causes amd_dbgapi_target_breakpoint::check_status to be called - Meanwhile, all waves of the kernel hit the breakpoint on vectorADD - amd_dbgapi_target_breakpoint::check_status calls process_event_queue, which pulls the thousand of breakpoint hit events from the kernel - As part of handling the breakpoint hit events, we write the PC of the waves that stopped to decrement it. Because the forward progress requirement is not disabled, this causes a suspend/resume of the queue each time, which is time-consuming. The stack trace where this all happens is: #32 0x00007ffff6b9abda in amd_dbgapi_write_register (wave_id=..., register_id=..., offset=0, value_size=8, value=0x7fffea9fdcc0) at /home/smarchi/src/amd-dbgapi/src/register.cpp:587 #33 0x00005555588c0bed in amd_dbgapi_target::store_registers (this=0x55555c7b1d20 <the_amd_dbgapi_target>, regcache=0x507000002240, regno=470) at /home/smarchi/src/wt/amd/gdb/amd-dbgapi-target.c:2504 #34 0x000055555a5186a1 in target_store_registers (regcache=0x507000002240, regno=470) at /home/smarchi/src/wt/amd/gdb/target.c:3973 #35 0x0000555559fab831 in regcache::raw_write (this=0x507000002240, regnum=470, src=...) at /home/smarchi/src/wt/amd/gdb/regcache.c:890 #36 0x0000555559fabd2b in regcache::cooked_write (this=0x507000002240, regnum=470, src=...) at /home/smarchi/src/wt/amd/gdb/regcache.c:915 #37 0x0000555559fc3ca5 in regcache::cooked_write<unsigned long, void> (this=0x507000002240, regnum=470, val=140737323456768) at /home/smarchi/src/wt/amd/gdb/regcache.c:850 #38 0x0000555559fab09a in regcache_cooked_write_unsigned (regcache=0x507000002240, regnum=470, val=140737323456768) at /home/smarchi/src/wt/amd/gdb/regcache.c:858 #39 0x0000555559fb0678 in regcache_write_pc (regcache=0x507000002240, pc=0x7ffff62bd900) at /home/smarchi/src/wt/amd/gdb/regcache.c:1460 #40 0x00005555588bb37d in process_one_event (event_id=..., event_kind=AMD_DBGAPI_EVENT_KIND_WAVE_STOP) at /home/smarchi/src/wt/amd/gdb/amd-dbgapi-target.c:1873 #41 0x00005555588bbf7b in process_event_queue (process_id=..., until_event_kind=AMD_DBGAPI_EVENT_KIND_BREAKPOINT_RESUME) at /home/smarchi/src/wt/amd/gdb/amd-dbgapi-target.c:2006 #42 0x00005555588b1aca in amd_dbgapi_target_breakpoint::check_status (this=0x511000140900, bs=0x50600014ed00) at /home/smarchi/src/wt/amd/gdb/amd-dbgapi-target.c:890 #43 0x0000555558c50080 in bpstat_stop_status (aspace=0x5070000061b0, bp_addr=0x7fffed0b9ab0, thread=0x518000026c80, ws=..., stop_chain=0x50600014ed00) at /home/smarchi/src/wt/amd/gdb/breakpoint.c:6126 #44 0x000055555984f4ff in handle_signal_stop (ecs=0x7fffeaa40ef0) at /home/smarchi/src/wt/amd/gdb/infrun.c:7169 #45 0x000055555984b889 in handle_inferior_event (ecs=0x7fffeaa40ef0) at /home/smarchi/src/wt/amd/gdb/infrun.c:6621 #46 0x000055555983eab6 in fetch_inferior_event () at /home/smarchi/src/wt/amd/gdb/infrun.c:4750 #47 0x00005555597caa5f in inferior_event_handler (event_type=INF_REG_EVENT) at /home/smarchi/src/wt/amd/gdb/inf-loop.c:42 #48 0x00005555588b838e in handle_target_event (client_data=0x0) at /home/smarchi/src/wt/amd/gdb/amd-dbgapi-target.c:1513 Fix that performance problem by disabling the forward progress requirement in amd_dbgapi_target_breakpoint::check_status, before calling process_event_queue, so that we can process all events efficiently. Since the same performance problem could theoritically happen any time process_event_queue is called with forward progress requirement enabled, add an assert to ensure that forward progress requirement is disabled when process_event_queue is invoked. This makes it necessary to add a require_forward_progress call to amd_dbgapi_finalize_core_attach. It looks a bit strange, since core files don't have execution, but it doesn't hurt. Add a test that replicates this scenario. The test launches a kernel that hits a breakpoint (with an always false condition) repeatedly. Meanwhile, the host process loads an unloads a code object, causing check_status to be called. Bug: SWDEV-482511 Change-Id: Ida86340d679e6bd8462712953458c07ba3fd49ec Approved-by: Lancelot Six <lancelot.six@amd.com>
2025-06-16gdb/amd-dbgapi: factor out require_forward_progress overload to target one ↵Simon Marchi1-20/+27
inferior A following patch will want to call require_forward_progress for a given inferior. Extract a new require_forward_progress overload from the existing require_forward_progress function that targets a specific inferior. Change-Id: I54f42b83eb8443d4d91747ffbc86eaeb017f1e49 Approved-by: Lancelot Six <lancelot.six@amd.com>
2025-06-16gdb/amd-dbgapi: pass amd_dbgapi_inferior_info to process_one_eventSimon Marchi1-36/+19
Pass the amd_dbgapi_inferior_info object from process_event_queue to process_one_event. Since process_event_queue pulls events for one specific inferior, we know for which inferior the event is. This removes the need for process_one_event to do two dbgapi calls to get the relevant pid. If also removes one inferior lookup. Change-Id: I22927e4b6251513eb3be95785082058aa3d09954 Approved-by: Lancelot Six <lancelot.six@amd.com>
2025-06-16gdb/amd-dbgapi: pass amd_dbgapi_inferior_info to process_event_queueSimon Marchi1-16/+9
A following patch will make process_event_queue access a field of amd_dbgapi_inferior_info. Prepare for this by making process_event_queue accept an amd_dbgapi_inferior_info object, instead of a process id. Change-Id: I9adc491dd1ff64ff74c40aa7662fffb11bd8332b Approved-by: Lancelot Six <lancelot.six@amd.com>
2025-06-16gdb/amd-dbgapi: add assert in require_forward_progressSimon Marchi1-0/+6
I didn't have a problem in this area, but it seems to me that this pre-condition should always hold. We should only disable forward progress requirement if the target says it's ok to do so. Otherwise, we could get in a situation where we wait for events from amd-dbgapi, which will never arrive, because amd-dbgapi didn't actually resume things. Change-Id: Ifc49f55c7874924b7c47888b8391a07a01d960fc Approved-by: Lancelot Six <lancelot.six@amd.com>
2025-06-16gdb/amd-dbgapi: remove unnecessary AMD_DBGAPI_EVENT_KIND_NONE argumentSimon Marchi1-1/+1
Rely on the default value. Change-Id: I08c683de005806c5c5d29ed7f9b0c6de81b49a01 Approved-By: Lancelot Six <lancelot.six@amd.com>
2025-06-16[gdb/testsuite] Fix gdb.python/py-source-styling-2.exp with TERM=dumbTom de Vries1-12/+12
When running test-case gdb.python/py-source-styling-2.exp with TERM=dumb, I get: ... (gdb) set style enabled on^M warning: The current terminal doesn't support styling. \ Styled output might not appear as expected.^M (gdb) FAIL: $exp: set style enabled on ... Fix this by using with_ansi_styling_terminal on clean_restart. Tested on x86_64-linux.
2025-06-14* gdb/doc/gdb.texinfo (Emacs): Refer to Emacs manualJeremy Bryant1-130/+5
The manual section on using GDB under Emacs is out-of-date and duplicates existing and comprehensive documentation in the Emacs manual. Replace the section by a short introduction and reference. Approved-By: Eli Zaretskii <eliz@gnu.org>
2025-06-13gdbsupport: make gdb::parallel_for_each's n parameter a template parameterSimon Marchi2-3/+3
This value will likely never change at runtime, so we might as well make it a template parameter. This has the "advantage" of being able to remove the unnecessary param from gdb::sequential_for_each. Change-Id: Ia172ab8e08964e30d4e3378a95ccfa782abce674 Approved-By: Tom Tromey <tom@tromey.com>
2025-06-13gdb: re-work parallel-for-selftests.cSimon Marchi1-81/+56
I find this file difficult to work with and modify, due to how it uses the preprocessor to include itself, to generate variations of the test functions. Change it to something a bit more C++-y, with a test function that accepts a callback to invoke the foreach function under test. Change-Id: Ibf1e2907380a88a4f8e4b4b88df2b0dfd0e9b6c8
2025-06-13gdb/dwarf: make cooked_index_flag's to_string handle IS_SYNTHESIZEDSimon Marchi1-0/+1
Change-Id: Iaac252aa2abbe169153e79b84f956cda172c69d1
2025-06-12Minor grammar fix in DAP commentTom Tromey1-1/+1
I noticed a minor grammer issue in a comment in DAP.
2025-06-12gdb, linespec: avoid multiple locations with same PCKlaus Gerlicher3-0/+14
Setting a BP on a line like this would incorrectly yield two BP locations: 01 void two () { {int var = 0;} } (gdb) break 1 Breakpoint 1 at 0x1164: main.cpp:1. (2 locations) (gdb) info breakpoints Num Type Disp Enb Address What 1 breakpoint keep y <MULTIPLE> 1.1 y 0x0000000000001164 in two() at main.cpp:1 1.2 y 0x0000000000001164 in two() at main.cpp:1 In this case decode_digits_ordinary () returns two SALs, exactly matching the requested line. One for the entry PC and one for the prologue end PC. This was tested with GCC, CLANG and ICPX. Subsequent code tries to skip the prologue on these PCs, which in turn makes them the same. To fix this, ignore SALs with the same PC and program space when adding to the list of SALs. This will then properly set only one location: (gdb) break 1 Breakpoint 1 at 0x1164: file main.cpp, line 1 (gdb) info breakpoints Num Type Disp Enb Address What 1 breakpoint keep y 0x0000000000001164 in two() at main.cpp:1 Approved-By: Simon Marchi <simon.marchi@efficios.com>
2025-06-12gdb: convert linux-namespaces debug to the new(er) debug schemeAndrew Burgess2-39/+41
Convert 'set debug linux-namespaces' to the new(er) debug scheme. As part of this change I converted the mnsh_debug_print_message function, which previously printed its output, to instead return a std::string, this string is then printed using linux_namespaces_debug_printf. The mnsh_debug_print_message function is only used as part of the debug output. I also updated one place in the code where debug_linux_namespaces, the debug control variable, which is a boolean, was assigned an integer. When debug is turned on then clearly the output is now different, but in all other cases, there should be no user visible change in GDB after this commit. Approved-By: Tom Tromey <tom@tromey.com>
2025-06-11gdb: fix size of z80 "add ii,rr" and "ld (ii+d),n" instructionsAaron Griffith1-3/+3
The tables in z80-tdep.c previously either gave these instructions the wrong size, or failed to recognize them by using the wrong masks, or both. The fixed instructions alongside their representation in octal are: * add ii,rr: [0335] 00r1 (where r & 1 == 1) [0375] 00r1 * ld (ii+d,n): [0335] 0066 <d> <n> [0375] 0066 <d> <n> Prefix bytes inside [] do not count towards instruction length in these tables. Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=33066 Approved-By: Tom Tromey <tom@tromey.com>
2025-06-11GDB: doc: Improve AArch64 subsubsection titles and index entries in gdb.texinfoThiago Jung Bauermann1-14/+15
Remove period from subsubsection titles in the AArch64 configuration-specific subsection, and expand acronyms. Regarding @cindex entries, remove periods and standardise their order and the position of "AArch64" to make it easier to find them by using the index-searching commands of Info readers that offer TAB completion. Approved-By: Eli Zaretskii <eliz@gnu.org>
2025-06-11gdb testsuite: Introduce allow_multi_inferior_tests and use it throughoutPedro Alves25-45/+116
The Windows port does not support multi-process debugging. Testcases that want to exercise multi-process currently FAIL and some hit cascading timeouts. Add a new allow_multi_inferior_tests procedure, meant to be used with require, and sprinkle it throughout testcases as needed. Approved-by: Kevin Buettner <kevinb@redhat.com> Change-Id: I4a10d8f04f9fa10f4b751f140ad0a6d31fbd9dfb
2025-06-11gdb testsuite: Introduce allow_fork_tests and use it throughoutPedro Alves37-29/+78
Cygwin debugging does not support follow fork. There is currently no interface between the debugger and the Cygwin runtime to be able to intercept forks and execs. Consequently, testcases that try to exercise fork/exec all FAIL, and several hit long cascading timeouts. Add a new allow_fork_tests procedure, meant to be used with require, and sprinkle it throughout testcases that exercise fork. Note that some tests currently are skipped on targets other than Linux, with something like: # Until "set follow-fork-mode" and "catch vfork" are implemented on # other targets... # if {![istarget "*-linux*"]} { continue } However, some BSD ports also support fork debugging nowadays, and the testcases were never adjusted... That is why the new allow_fork_tests procedure doesn't look for linux. With this patch, on Cygwin, I get this: $ make check TESTS="*/*fork*.exp" ... === gdb Summary === # of expected passes 6 # of untested testcases 1 # of unsupported tests 31 Reviewed-By: Keith Seitz <keiths@redhat.com> Change-Id: I0c5e8c574d1f61b28d370c22a0b0b6bc3efaf978