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This commit improves GDB's handling of inline functions when there are
more than one inline function in a stack, so for example if we have a
stack like:
main -> aaa -> bbb -> ccc -> ddd
And aaa, bbb, and ccc are all inline within main GDB should (when
given sufficient debug information) be able to step from main through
aaa, bbb, and ccc. Unfortunately, this currently doesn't work, here's
an example session:
(gdb) start
Temporary breakpoint 1 at 0x4003b0: file test.c, line 38.
Starting program: /project/gdb/tests/inline/test
Temporary breakpoint 1, main () at test.c:38
38 global_var = 0;
(gdb) step
39 return aaa () + 1;
(gdb) step
aaa () at test.c:39
39 return aaa () + 1;
(gdb) step
bbb () at test.c:39
39 return aaa () + 1;
(gdb) step
ccc () at test.c:39
39 return aaa () + 1;
(gdb) step
ddd () at test.c:32
32 return global_var;
(gdb) bt
#0 ddd () at test.c:32
#1 0x00000000004003c1 in ccc () at test.c:39
#2 bbb () at test.c:26
#3 aaa () at test.c:14
#4 main () at test.c:39
Notice that once we get to line 39 in main, GDB keeps reporting line
39 in main as the location despite understanding that the inferior is
stepping through the nested inline functions with each use of step.
The problem is that as soon as the inferior stops we call
skip_inline_frames (from inline-frame.c) which calculates the
inferiors current state in relation to inline functions - it figures
out if we're in an inline function, and if we are counts how many
inline frames there are at the current location.
So, in our example above, when we step from line 38 in main to line 39
we stop at a location that is simultaneously in all of main, aaa, bbb,
and ccc. The block structure reflects the order in which the
functions would be called, with ccc being the most inner block and
main being the most outer block. When we stop GDB naturally finds the
block for ccc, however within skip_inline_frames we spot that bbb,
aaa, and main are super-blocks of the current location and that each
layer represents an inline function. The skip_inline_frames then
records the depth of inline functions (3 in this case for aaa, bbb,
and ccc) and also the symbol of the outermost inline function (in this
case 'aaa' as main isn't an inline function, it just has things inline
within it).
Now GDB understands the stack to be main -> aaa -> bbb -> ccc,
however, the state initialised in skip_inline_frames starts off
indicating that we should hide 3 frames from the user, so we report
that we're in main at line 39. The location of main, line 39 is
derived by asking the inline function state for the last symbol in the
stack (aaa in this case), and then asking for it's location - the
location of an inlined function symbol is its call site, so main, line
39 in this case.
If the user then asks GDB to step we don't actually move the inferior
at all, instead we spot that we are in an inline function stack,
lookup the inline state data, and reduce the skip depth by 1. We then
report to the user that GDB has stopped. GDB now understands that we
are in 'aaa'. In order to get the precise location we again ask GDB
for the last symbol from the inline data structure, and we are again
told 'aaa', we then get the location from 'aaa', and report that we
are in main, line 39.
Hopefully it's clear what the mistake here is, once we've reduced the
inline skip depth we should not be using 'aaa' to compute the precise
location, instead we should be using 'bbb'. That is what this patch
does.
Now, when we call skip_inline_frames instead of just recording the
last skipped symbol we now record all symbols in the inline frame
stack. When we ask GDB for the last skipped symbol we return a symbol
based on how many frames we are skipping, not just the last know
symbol.
With this fix in place, the same session as above now looks much
better:
(gdb) start
Temporary breakpoint 1 at 0x4003b0: file test.c, line 38.
Starting program: /project/gdb/tests/inline/test
Temporary breakpoint 1, main () at test.c:38
38 global_var = 0;
(gdb) s
39 return aaa () + 1;
(gdb) s
aaa () at test.c:14
14 return bbb () + 1;
(gdb) s
bbb () at test.c:26
26 return ccc () + 1;
(gdb) s
ccc () at test.c:20
20 return ddd () + 1;
(gdb) s
ddd () at test.c:32
32 return global_var;
(gdb) bt
#0 ddd () at test.c:32
#1 0x00000000004003c1 in ccc () at test.c:20
#2 bbb () at test.c:26
#3 aaa () at test.c:14
#4 main () at test.c:39
gdb/ChangeLog:
* frame.c (find_frame_sal): Move call to get_next_frame into more
inner scope.
* inline-frame.c (inilne_state) <inline_state>: Update argument
types.
(inilne_state) <skipped_symbol>: Rename to...
(inilne_state) <skipped_symbols>: ...this, and change to a vector.
(skip_inline_frames): Build vector of skipped symbols and use this
to reate the inline_state.
(inline_skipped_symbol): Add a comment and some assertions, fetch
skipped symbol from the list.
gdb/testsuite/ChangeLog:
* gdb.dwarf2/dw2-inline-many-frames.c: New file.
* gdb.dwarf2/dw2-inline-many-frames.exp: New file.
Change-Id: I99def5ffb44eb9e58cda4b449bf3d91ab0386c62
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Don't reorder line table entries for the same address when sorting the
line table, maintain the compiler given line order. Usually this will
reflect the order in which lines are conceptually encountered at a
given address.
Consider this example:
/* 1 */ volatile int global_var;
/* 2 */ int __attribute__ ((noinline))
/* 3 */ bar ()
/* 4 */ {
/* 5 */ return global_var;
/* 6 */ }
/* 7 */ static inline int __attribute__ ((always_inline))
/* 8 */ foo ()
/* 9 */ {
/* 10 */ return bar ();
/* 11 */ }
/* 12 */ int
/* 13 */ main ()
/* 14 */ {
/* 15 */ global_var = 0;
/* 16 */ return foo ();
/* 17 */ }
GCC 10 currently generates a line table like this (as shown by
objdump):
CU: ./test.c:
File name Line number Starting address
test.c 4 0x4004b0
test.c 5 0x4004b0
test.c 6 0x4004b6
test.c 6 0x4004b7
test.c 14 0x4003b0
test.c 15 0x4003b0
test.c 16 0x4003ba
test.c 10 0x4003ba
test.c 10 0x4003c1
The interesting entries are those for lines 16 and 10 at address
0x4003ba, these represent the call to foo and the inlined body of
foo.
With the current line table sorting GDB builds the line table like
this (as shown by 'maintenance info line-table'):
INDEX LINE ADDRESS
0 14 0x00000000004003b0
1 15 0x00000000004003b0
2 10 0x00000000004003ba
3 16 0x00000000004003ba
4 END 0x00000000004003c1
5 4 0x00000000004004b0
6 5 0x00000000004004b0
7 END 0x00000000004004b7
Notice that entries 2 and 3 for lines 10 and 16 are now in a different
order to the line table as given by the compiler. With this patch
applied the order is now:
INDEX LINE ADDRESS
0 14 0x00000000004003b0
1 15 0x00000000004003b0
2 16 0x00000000004003ba
3 10 0x00000000004003ba
4 END 0x00000000004003c1
5 4 0x00000000004004b0
6 5 0x00000000004004b0
7 END 0x00000000004004b7
Notice that entries 2 and 3 are now in their original order again.
The consequence of the incorrect ordering is that when stepping
through inlined functions GDB will display the wrong line for the
inner most frame. Here's a GDB session before this patch is applied:
Starting program: /home/andrew/tmp/inline/test
Temporary breakpoint 1, main () at test.c:15
15 /* 15 */ global_var = 0;
(gdb) step
16 /* 16 */ return foo ();
(gdb) step
foo () at test.c:16
16 /* 16 */ return foo ();
(gdb) step
bar () at test.c:5
5 /* 5 */ return global_var;
The step from line 15 to 16 was fine, but the next step should have
taken us to line 10, instead we are left at line 16. The final step
to line 5 is as expected.
With this patch applied the session goes better:
Starting program: /home/andrew/tmp/inline/test
Temporary breakpoint 1, main () at test.c:15
15 /* 15 */ global_var = 0;
(gdb) step
16 /* 16 */ return foo ();
(gdb) step
foo () at test.c:10
10 /* 10 */ return bar ();
(gdb) step
bar () at test.c:5
5 /* 5 */ return global_var;
We now visit the lines as 15, 16, 10, 5 as we would like.
The reason for this issue is that the inline frame unwinder is
detecting that foo is inlined in main. When we stop at the shared
address 0x4003ba the inline frame unwinder first shows us the outer
frame, this information is extracted from the DWARF's
DW_TAG_inlined_subroutine entries and passed via GDB's block data.
When we step again the inlined frame unwinder moves us up the call
stack to the inner most frame at which point the frame is displayed as
normal, with the location for the address being looked up in the line
table.
As GDB uses the last line table entry for an address as "the" line to
report for that address it is critical that GDB maintain the order of
the line table entries. In the first case, by reordering the line
table we report the wrong location.
I had to make a small adjustment in find_pc_sect_line in order to
correctly find the previous line in the line table. In some line
tables I was seeing an actual line entry and an end of sequence marker
at the same address, before this commit these would reorder to move
the end of sequence marker before the line entry (end of sequence has
line number 0). Now the end of sequence marker remains in its correct
location, and in order to find a previous line we should step backward
over any end of sequence markers.
As an example, the binary:
gdb/testsuite/outputs/gdb.dwarf2/dw2-ranges-func/dw2-ranges-func-lo-cold
Has this line table before the patch:
INDEX LINE ADDRESS
0 48 0x0000000000400487
1 END 0x000000000040048e
2 52 0x000000000040048e
3 54 0x0000000000400492
4 56 0x0000000000400497
5 END 0x000000000040049a
6 62 0x000000000040049a
7 END 0x00000000004004a1
8 66 0x00000000004004a1
9 68 0x00000000004004a5
10 70 0x00000000004004aa
11 72 0x00000000004004b9
12 END 0x00000000004004bc
13 76 0x00000000004004bc
14 78 0x00000000004004c0
15 80 0x00000000004004c5
16 END 0x00000000004004cc
And after this patch:
INDEX LINE ADDRESS
0 48 0x0000000000400487
1 52 0x000000000040048e
2 END 0x000000000040048e
3 54 0x0000000000400492
4 56 0x0000000000400497
5 END 0x000000000040049a
6 62 0x000000000040049a
7 66 0x00000000004004a1
8 END 0x00000000004004a1
9 68 0x00000000004004a5
10 70 0x00000000004004aa
11 72 0x00000000004004b9
12 END 0x00000000004004bc
13 76 0x00000000004004bc
14 78 0x00000000004004c0
15 80 0x00000000004004c5
16 END 0x00000000004004cc
When calling find_pc_sect_line with the address 0x000000000040048e, in
both cases we find entry #3, we then try to find the previous entry,
which originally found this entry '2 52 0x000000000040048e',
after the patch it finds '2 END 0x000000000040048e', which
cases the lookup to fail.
By skipping the END marker after this patch we get back to the correct
entry, which is now #1: '1 52 0x000000000040048e', and
everything works again.
gdb/ChangeLog:
* buildsym.c (lte_is_less_than): Delete.
(buildsym_compunit::end_symtab_with_blockvector): Create local
lambda function to sort line table entries, and use
std::stable_sort instead of std::sort.
* symtab.c (find_pc_sect_line): Skip backward over end of sequence
markers when looking for a previous line.
gdb/testsuite/ChangeLog:
* gdb.dwarf2/dw2-inline-stepping.c: New file.
* gdb.dwarf2/dw2-inline-stepping.exp: New file.
Change-Id: Ia0309494be4cfd9dcc554f30209477f5f040b21b
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In this commit:
commit d9b3de22f33e400f7f409cce3acf6c7dab07dd79
Date: Wed May 27 14:44:29 2015 -0700
Add struct to record dwarf line number state machine.
I believe an unintended change was made to how we store the DWARF line
table, the end of sequence markers between sequences of lines were
lost from the line table.
This commit fixes this small oversight and restores the end of
sequence markers.
Given that we've survived this long without noticing is clearly an
indication that this isn't that serious, however, a later patch that I
am developing would benefit from having the markers in place, so I'd
like to restore them.
Having the markers also means that the output of 'maintenance info
line-table' now more closely reflects the DWARF line table.
I've taken this opportunity to improve how 'maintenance info
line-table' displays the end of sequence markers - it now uses the END
keyword, rather than just printing an entry with line number 0. So we
see this:
INDEX LINE ADDRESS
0 12 0x00000000004003b0
1 17 0x00000000004003b0
2 18 0x00000000004003b0
3 END 0x00000000004003b7
4 5 0x00000000004004a0
5 6 0x00000000004004a0
6 END 0x00000000004004a7
Instead of what we would have seen, which was this:
INDEX LINE ADDRESS
0 12 0x00000000004003b0
1 17 0x00000000004003b0
2 18 0x00000000004003b0
3 0 0x00000000004003b7
4 5 0x00000000004004a0
5 6 0x00000000004004a0
6 0 0x00000000004004a7
I've added a small test that uses 'maintenance info line-table' to
ensure that we don't regress this again.
gdb/ChangeLog:
* dwarf2read.c (lnp_state_machine::record_line): Include
end_sequence parameter in debug print out. Record the line if we
are at an end_sequence marker even if it's not the start of a
statement.
* symmisc.c (maintenance_print_one_line_table): Print end of
sequence markers with 'END' not '0'.
gdb/testsuite/ChangeLog:
* gdb.base/maint.exp: Update line table parsing test.
* gdb.dwarf2/dw2-ranges-base.exp: Add new line table parsing test.
Change-Id: I002f872248db82a1d4fefdc6b51ff5dbf932d8a8
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Looking at older versions of the patch, I confirmed that the odd comment
I referred to earlier was indeed from the removal of the sx support. It
also explains an oddly formatted switch statement. This patch fixes both
minor problems.
bfd/
* elfxx-riscv.c (riscv_get_prefix_class): Format s case like others.
(riscv_parse_prefixed_ext): Fix s extension comment and reword to
avoid over long line.
Change-Id: I1cb62e4a16188270f029b6376e4b1684000d6c7a
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This fixes a latent bug exposed by the multi-target patch (5b6d1e4fa
"Multi-target support), and then fixes two other latent bugs exposed
by fixing that first latent bug.
The symptom described in the bug report is that starting a first
inferior, then trying to run a second (multi-threaded) inferior twice,
causes libthread_db to fail to load, along with other erratic
behavior:
(gdb) run
Starting program: /tmp/foo
warning: td_ta_new failed: generic error
Going a bit deeply, I found that if the two inferiors have different
symbols, we can see that just after inferior 2 exits, we are left with
inferior 2 selected, which is correct, but the symbols in scope belong
to inferior 1, which is obviously incorrect...
This problem is that there's a path in
scoped_restore_current_thread::restore() that switches to no thread
selected, and switches the current inferior, but leaves the current
program space as is, resulting in leaving the program space pointing
to the wrong program space (the one of the other inferior). This was
happening after handling TARGET_WAITKIND_NO_RESUMED, which is an event
that triggers after TARGET_WAITKIND_EXITED for the previous inferior
exit. Subsequent symbol lookups find the symbols of the wrong
inferior.
The fix is to use switch_to_inferior_no_thread in that problem spot.
This function was recently added along with the multi-target work
exactly for these situations.
As for testing, this patch adds a new testcase that tests symbol
printing just after inferior exit, which exercises the root cause of
the problem more directly. And then, to cover the use case described
in the bug too, it also exercises the lithread_db.so mis-loading, by
using TLS printing as a proxy for being sure that threaded debugging
was activated sucessfully. The testcase fails without the fix like
this, for the "print symbol just after exit" bits:
...
[Inferior 1 (process 8719) exited normally]
(gdb) PASS: gdb.multi/multi-re-run.exp: re_run_inf=1: iter=1: continue until exit
print re_run_var_1
No symbol "re_run_var_1" in current context.
(gdb) FAIL: gdb.multi/multi-re-run.exp: re_run_inf=1: iter=1: print re_run_var_1
...
And like this for the "libthread_db.so loading" bits:
(gdb) run
Starting program: /home/pedro/gdb/binutils-gdb/build/gdb/testsuite/outputs/gdb.multi/multi-re-run/multi-re-run
warning: td_ta_new failed: generic error
[New LWP 27001]
Thread 1.1 "multi-re-run" hit Breakpoint 3, all_started () at /home/pedro/gdb/binutils-gdb/build/../src/gdb/testsuite/gdb.multi/multi-re-run.c:44
44 }
(gdb) PASS: gdb.multi/multi-re-run.exp: re_run_inf=1: iter=2: running to all_started in runto
print tls_var
Cannot find thread-local storage for LWP 27000, executable file /home/pedro/gdb/binutils-gdb/build/gdb/testsuite/outputs/gdb.multi/multi-re-run/multi-re-run:
Cannot find thread-local variables on this target
(gdb) FAIL: gdb.multi/multi-re-run.exp: re_run_inf=1: iter=2: print tls_var
As mentioned, that fix above goes on to expose a couple other latent
bugs. This commit fixes those as well.
The first latent bug exposed is in
infrun.c:handle_vfork_child_exec_or_exit. The current code is leaving
inf->pspace == NULL while calling clone_program_space. The idea was
to make it so that the breakpoints module doesn't use this inferior's
pspace to set breakpoints. With that, any
scoped_restore_current_thread use from within clone_program_space
tries to restore a NULL program space, which hits an assertion:
Attaching after Thread 0x7ffff74b8700 (LWP 27276) vfork to child process 27277]
[New inferior 2 (process 27277)]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
/home/pedro/gdb/binutils-gdb/build/../src/gdb/progspace.c:243: internal-error: void set_current_program_space(program_space*): Assertion `pspace != NULL' faile
d.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) FAIL: gdb.threads/vfork-follow-child-exit.exp: detach-on-fork=off: continue (GDB internal error)
That NULL pspace idea was legitimate, but it's no longer necessary,
since commit b2e586e850db ("Defer breakpoint reset when cloning
progspace for fork child"). So the fix is to just set the inferior's
program space earlier.
The other latent bug exposed is in exec.c. When exec_close is called
from the program_space destructor, it is purposedly called with a
current program space that is not the current inferior's program
space. The problem is that the multi-target work added some code to
remove_target_sections that loops over all inferiors, and uses
scoped_restore_current_thread to save/restore the previous
thread/inferior/frame state. This makes it so that exec_close returns
with the current program space set to the current inferior's program
space, which is exactly what we did not want. Then the program_space
destructor continues into free_all_objfiles, but it is now running
that method on the wrong program space, resulting in:
Reading symbols from /home/pedro/gdb/binutils-gdb/build/gdb/testsuite/outputs/gdb.threads/fork-plus-threads/fork-plus-threads...
Reading symbols from /usr/lib/debug/usr/lib64/libpthread-2.26.so.debug...
Reading symbols from /usr/lib/debug/usr/lib64/libm-2.26.so.debug...
Reading symbols from /usr/lib/debug/usr/lib64/libc-2.26.so.debug...
Reading symbols from /usr/lib/debug/usr/lib64/ld-2.26.so.debug...
[Inferior 3 (process 9583) exited normally]
/home/pedro/gdb/binutils-gdb/build/../src/gdb/progspace.c:170: internal-error: void program_space::free_all_objfiles(): Assertion `so->objfile == NULL' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) FAIL: gdb.threads/fork-plus-threads.exp: detach-on-fork=off: inferior 1 exited (GDB internal error)
The fix is to use scoped_restore_current_pspace_and_thread instead of
scoped_restore_current_thread.
gdb/ChangeLog:
2020-01-24 Pedro Alves <palves@redhat.com>
PR gdb/25410
* thread.c (scoped_restore_current_thread::restore): Use
switch_to_inferior_no_thread.
* exec.c: Include "progspace-and-thread.h".
(add_target_sections, remove_target_sections):
scoped_restore_current_pspace_and_thread instead of
scoped_restore_current_thread.
* infrun.c (handle_vfork_child_exec_or_exit): Assign the pspace
and aspace to the inferior before calling clone_program_space.
Remove stale comment.
gdb/testsuite/ChangeLog:
2020-01-24 Pedro Alves <palves@redhat.com>
PR gdb/25410
* gdb.multi/multi-re-run-1.c: New.
* gdb.multi/multi-re-run-2.c: New.
* gdb.multi/multi-re-run.exp: New.
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So far this was only possible indirectly when invoked from the gdb directory.
This makes the install-strip target independent from gdb.
2020-01-24 Hannes Domani <ssbssa@yahoo.de>
* Makefile.in (install-strip): New target.
(install_sh, INSTALL_STRIP_PROGRAM, STRIP): New variables.
* aclocal.m4: Regenerate.
* configure: Regenerate.
* configure.ac: Add AM_PROG_INSTALL_STRIP.
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Fixes a compile error because the class is actually called
arm_netbsd_nat_target.
gdb/ChangeLog:
2020-01-24 Christian Biesinger <cbiesinger@google.com>
* arm-nbsd-nat.c (arm_nbsd_nat_target::fetch_registers): Rename to...
(arm_netbsd_nat_target::fetch_registers): ...this.
(arm_nbsd_nat_target::store_registers): Rename to...
(arm_netbsd_nat_target::store_registers): ...this.
Change-Id: Ibebfab9edeff48f54c32d0745afda1d74d31de92
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Fixes the below compile error on ARM NetBSD 9.0_RC1 (the only version I
tested). types.h does not define register_t by default.
We already use this define elsewhere, notably in bsd-kvm.c.
In file included from ../../gdb/arm-nbsd-nat.c:28:
/usr/include/machine/frame.h:54:2: error: unknown type name 'register_t'; did you mean '__register_t'?
register_t tf_spsr;
^
/usr/include/machine/types.h:77:14: note: '__register_t' declared here
typedef int __register_t;
^
There are other compile errors that this does not fix.
gdb/ChangeLog:
2020-01-24 Christian Biesinger <cbiesinger@google.com>
* arm-nbsd-nat.c: Define _KERNTYPES to get the declaration of
register_t.
Change-Id: I82c21d38189ee59ea0af2538ba84b771d268722e
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On NetBSD, pthread_setname_np takes a printf-style format string plus
one argument:
https://netbsd.gw.com/cgi-bin/man-cgi?pthread_setname_np++NetBSD-current
This patch makes thread-pool.c handle that.
gdbsupport/ChangeLog:
2020-01-24 Christian Biesinger <cbiesinger@google.com>
* thread-pool.c (set_thread_name): Add an overload for the NetBSD
version of pthread_setname_np.
Change-Id: I61e664a813eaa7f52b6811b1a43e08ac3082d8ef
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PR 25447
* coffgen.c (_bfd_coff_close_and_cleanup): Do not clear the keep
syms and keep strings flags as these may have been set in order to
prevent a bogus call to free.
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Fix a:
make: *** No rule to make target '.../gdb/gdbserver/arch/arm.c', needed by 'TAGS'. Stop.
error produced by `make TAGS' by making the list of sources processed
match actual file locations and by moving host-specific object files
listed in DEPFILES to nat/ or target/ subdirectories as appropriate so
that the location of the corresponding source file can be mechanically
determined.
gdb/gdbserver/
* Makefile.in (SFILES): Adjust paths to point to real files.
(OBS): Move waitstatus.o to target/waitstatus.o.
(TAGS): Transform paths appropriately.
(%.o): Rename to...
(nat/%.o): ... this pattern rule.
(%.o): Rename to...
(target/%.o): ... this pattern rule.
* configure.srv: Adjust paths throughout to include nat/ prefix
with the revant files.
* configure.ac: Add `nat' and `target' to CONFIG_SRC_SUBDIR.
* configure: Regenerate.
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Complement commit 7ea814144a31 ("Fully disentangle gdb and gdbserver"),
<https://sourceware.org/ml/gdb-patches/2002-02/msg00692.html> (from
2002!), and remove a recipe to include config files in `make TAGS',
which are no longer used by `gdbserver' as from that commit.
gdb/gdbserver/
* Makefile.in (TAGS): Remove config files from the recipe.
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* readelf.c (get_build_id): Fix warning messages about corrupt
notes.
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regset_from_core_section doesn't exist anymore; it has been replaced
by the iterate_over_regset_sections gdbarch method. Update comments
accordingly to not confuse readers.
gdb/ChangeLog:
2020-01-24 Christian Biesinger <cbiesinger@google.com>
* aarch64-fbsd-tdep.c (aarch64_fbsd_iterate_over_regset_sections):
Update comment.
* aarch64-linux-tdep.c (aarch64_linux_iterate_over_regset_sections):
Likewise.
* arm-fbsd-tdep.c (arm_fbsd_iterate_over_regset_sections): Likewise.
* gdbcore.h (deprecated_add_core_fns): Update comment to point to
the correct replacement (iterate_over_regset_sections).
* riscv-fbsd-tdep.c (riscv_fbsd_iterate_over_regset_sections):
Update comment.
Change-Id: I5eea4d18e15edae5d6dfd5d0d6241e5b2ae40daa
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This is an update of this patch:
https://sourceware.org/ml/gdb-patches/2018-09/msg00884.html
This patch attempts to address PR gdb/23718 by re-enabling stdin
whenever an exception is caught during gdb.execute().
When Python gdb.execute() is called, an exception could occur (e.g. the
target disappearing), which is then converted into a Python exception. If
stdin was disabled before the exception is caught, it is not re-enabled,
because the exception doesn't propagate to the top level of the event loop,
whose catch block would otherwise enable it.
The result is that when execution of a Python script completes, GDB does
not prompt or accept input, and is effectively hung.
This change rectifies the issue by re-enabling stdin in the catch block of
execute_gdb_command, prior to converting the exception to a Python
exception.
Since this patch was originally posted I've added a test, and also I
converted the code to re-enable stdin from this:
SWITCH_THRU_ALL_UIS ()
{
async_enable_stdin ();
}
to simply this:
async_enable_stdin ();
My reasoning is that we only need the SWITCH_THRU_ALL_UIS if, at the time
the exception is caught, the current_ui might be different than at the time
we called async_disable_stdin. Within python's execute_gdb_command I think
it should be impossible to switch current_ui, so the SWITCH_THRU_ALL_UIS
isn't needed.
gdb/ChangeLog:
PR gdb/23718
* gdb/python/python.c (execute_gdb_command): Call
async_enable_stdin in catch block.
gdb/testsuite/ChangeLog:
PR gdb/23718
* gdb.server/server-kill-python.exp: New file.
Change-Id: I1cfc36ee9f8484cc1ed82be9be338353db6bc080
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If we catch an exception in start_event_loop's call to
gdb_do_one_event, then it is possible that the current_ui has changed
since we called async_disable_stdin. If that's the case then calling
async_enable_stdin will be called on the wrong UI.
To solve this problem we wrap the call to async_enable_stdin with
SWITCH_THRU_ALL_UIS, this causes us to try and re-enable stdin for all
UIs, which will catch any for which we called async_disable_stdin.
gdb/ChangeLog:
* event-loop.c (start_event_loop): Wrap async_enable_stdin with
SWITCH_THRU_ALL_UIS.
gdb/testsuite/ChangeLog:
* gdb.server/multi-ui-errors.c: New file.
* gdb.server/multi-ui-errors.exp: New file.
Change-Id: I1e18deff2e6f4e17f7a13adce3553eb001cad93b
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This started as a patch to enable the asm window to handle attempts to
disassemble invalid memory, but it ended up expanding into a
significant rewrite of how the asm window handles scrolling. These
two things ended up being tied together as it was impossible to
correctly test scrolling into invalid memory when the asm window would
randomly behave weirdly while scrolling.
Things that should work nicely now; scrolling to the bottom or top of
the listing with PageUp, PageDown, Up Arrow, Down Arrow and we should
be able to scroll past small areas of memory that don't have symbols
associated with them. It should also be possible to scroll to the
start of a section even if there's no symbol at the start of the
section.
Adding tests for this scrolling was a little bit of a problem. First
I would have liked to add tests for PageUp / PageDown, but the tuiterm
library we use doesn't support these commands right now due to only
emulating a basic ascii terminal. Changing this to emulate a more
complex terminal would require adding support for more escape sequence
control codes, so I've not tried to tackle that in this patch.
Next, I would have liked to test scrolling to the start or end of the
assembler listing and then trying to scroll even more, however, this
is a problem because in a well behaving GDB a scroll at the start/end
has no effect. What we need to do is:
- Move to start of assembler listing,
- Send scroll up command,
- Wait for all curses output,
- Ensure the assembler listing is unchanged, we're still at the
start of the listing.
The problem is that there is no curses output, so how long do we wait
at step 3? The same problem exists for scrolling to the bottom of the
assembler listing. However, when scrolling down you can at least see
the end coming, so I added a test for this case, however, this feels
like an area of code that is massively under tested.
gdb/ChangeLog:
PR tui/9765
* minsyms.c (lookup_minimal_symbol_by_pc_section): Update header
comment, add extra parameter, and update to store previous symbol
when appropriate.
* minsyms.h (lookup_minimal_symbol_by_pc_section): Update comment,
add extra parameter.
* tui/tui-disasm.c (tui_disassemble): Update header comment,
remove unneeded parameter, add try/catch around gdb_print_insn,
rewrite to add items to asm_lines vector.
(tui_find_backward_disassembly_start_address): New function.
(tui_find_disassembly_address): Updated throughout.
(tui_disasm_window::set_contents): Update for changes to
tui_disassemble.
(tui_disasm_window::do_scroll_vertical): No need to adjust the
number of lines to scroll.
gdb/testsuite/ChangeLog:
PR tui/9765
* gdb.tui/tui-layout-asm.exp: Add scrolling test for asm window.
Change-Id: I323987c8fd316962c937e73c17d952ccd3cfa66c
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This is triggered by simply scrolling off the end of the dissasembly
window. This commit doesn't fix the actual exception that is being
thrown, which will still need to be fixed, but makes sure that we
don't ever throw an exception out to readline.
gdb/ChangeLog:
yyyy-mm-dd Pedro Alves <palves@redhat.com>
PR tui/9765
* tui/tui-io.c (tui_getc): Rename to ...
(tui_getc_1): ... this.
(tui_get): New, reimplent as try/catch wrapper around tui_getc_1.
Change-Id: I2e32a401ab34404b2132ec82a3e1c17b9b723e41
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The pattern
objfile->section_offsets[SECT_OFF_TEXT (objfile)]
... appears very often, to get the offset of the text section of an
objfile. I thought it would be more readable to write it as:
objfile->text_section_offset ()
... so I added this method and used it where possible. I also added
data_section_offset, although it is not used as much.
gdb/ChangeLog:
* objfiles.h (ALL_OBJFILE_OSECTIONS): Move up.
(SECT_OFF_DATA): Likewise.
(SECT_OFF_RODATA): Likewise.
(SECT_OFF_TEXT): Likewise.
(SECT_OFF_BSS): Likewise.
(struct objfile) <text_section_offset, data_section_offset>: New
methods.
* amd64-windows-tdep.c (amd64_windows_find_unwind_info): Use
objfile::text_section_offset.
* coff-pe-read.c (add_pe_forwarded_sym): Likewise.
* coffread.c (coff_symtab_read): Likewise.
(enter_linenos): Likewise.
(process_coff_symbol): Likewise.
* ctfread.c (get_objfile_text_range): Likewise.
* dtrace-probe.c (dtrace_probe::get_relocated_address):
Use objfile::data_section_offset.
* dwarf2-frame.c (execute_cfa_program): Use
objfile::text_section_offset.
(dwarf2_frame_find_fde): Likewise.
* dwarf2read.c (create_addrmap_from_index): Likewise.
(create_addrmap_from_aranges): Likewise.
(dw2_find_pc_sect_compunit_symtab): Likewise.
(process_psymtab_comp_unit_reader): Likewise.
(add_partial_symbol): Likewise.
(add_partial_subprogram): Likewise.
(process_full_comp_unit): Likewise.
(read_file_scope): Likewise.
(read_func_scope): Likewise.
(read_lexical_block_scope): Likewise.
(read_call_site_scope): Likewise.
(dwarf2_rnglists_process): Likewise.
(dwarf2_ranges_process): Likewise.
(dwarf2_ranges_read): Likewise.
(dwarf_decode_lines_1): Likewise.
(new_symbol): Likewise.
(dwarf2_fetch_die_loc_sect_off): Likewise.
(dwarf2_per_cu_text_offset): Likewise.
* hppa-bsd-tdep.c (hppabsd_find_global_pointer): Likewise.
* hppa-tdep.c (read_unwind_info): Likewise.
* ia64-tdep.c (ia64_find_unwind_table): Likewise.
* psympriv.h (struct partial_symtab): Likewise.
* psymtab.c (find_pc_sect_psymtab): Likewise.
* solib-svr4.c (enable_break): Likewise.
* stap-probe.c (relocate_address): Use
objfile::data_section_offset.
* xcoffread.c (enter_line_range): Use
objfile::text_section_offset.
(read_xcoff_symtab): Likewise.
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We encounter this error when building on macOS with GCC.
CXX darwin-nat.o
/src-local/binutils-gdb/gdb/darwin-nat.c: In member function 'ptid_t darwin_nat_target::wait_1(ptid_t, target_waitstatus*)':
/src-local/binutils-gdb/gdb/darwin-nat.c:1264:18: error: declaration of 'inf' shadows a previous local [-Werror=shadow=compatible-local]
for (inferior *inf : all_inferiors (this))
^~~
/src-local/binutils-gdb/gdb/darwin-nat.c:1205:20: note: shadowed declaration is here
struct inferior *inf;
^~~
Fix it by moving the declaration of `inf` in the specific scopes that
need it. I think it's clearer this way anyway, as it shows that it's
not the same `inf` that is used in these different scopes.
Thanks to Iain Sandoe for reporting this. I did not see this error at
first, because I compile with the default system compiler on macOS,
which is clang. The compiler flag we try to enable for this is
`-Wshadow=local`, which is not one recognized by clang. I checked to
see if there would a version of the -Wshadow* warnings [1] we could
enable for clang, that would catch this, but the only one that would is
`-Wshadow` itself, and this is too invasive for us (which is why we
enabled just -Wshadow=local in the first place).
[1] https://clang.llvm.org/docs/DiagnosticsReference.html#wshadow
gdb/ChangeLog:
* darwin-nat.c (darwin_nat_target::wait_1): Move `inf`
declaration to narrower scopes.
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The darwin-nat.c file doesn't build since the multi-target changes
(5b6d1e4f, "Multi-target support"). This patch makes it build. I have
access to a macOS vm, so I am able to build it, but I wasn't able to
successfully codesign it and try to actually debug something, so I don't
know if it works. I don't have much more time to put on this to figure
it out, so I thought I'd sent the patch anyway, as it's at least a step
in the right direction.
The bulk of the patch is to change a bunch of functions to be methods of
the darwin_nat_target object, so that this can pass `this` to
find_inferior_ptid and other functions that now require a
process_stratum_target pointer.
The darwin_ptrace_him function (renamed to darwin_nat_target::ptrace_him
in this patch) is passed to fork_inferior as the `init_trace_fun`
parameter. Since the method can't be passed as a plain function pointer
(we need the `this` pointer), I changed the `init_trace_fun` parameter
of fork_inferior to be a gdb::function_view, so we can pass a lambda and
capture `this`.
The changes in darwin-nat.h are only to move definition higher in the
file, so that forward declarations are not needed.
gdb/ChangeLog:
* darwin-nat.h (struct darwin_exception_msg, enum
darwin_msg_state, struct darwin_thread_info, darwin_thread_t):
Move up.
(class darwin_nat_target) <wait_1, check_new_threads,
decode_exception_message, decode_message, stop_inferior,
init_thread_list, ptrace_him, cancel_breakpoint>: Declare.
* darwin-nat.c (darwin_check_new_threads): Rename to...
(darwin_nat_target::check_new_threads): ... this.
(darwin_suspend_inferior_it): Remove.
(darwin_decode_exception_message): Rename to...
(darwin_nat_target::decode_exception_message): ... this.
(darwin_nat_target::resume): Pass target to find_inferior_ptid.
(darwin_decode_message): Rename to...
(darwin_nat_target::decode_message): ... this.
(cancel_breakpoint): Rename to...
(darwin_nat_target::cancel_breakpoint): ... this.
(darwin_wait): Rename to...
(darwin_nat_target::wait_1): ... this. Use range-based for loop
instead of iterate_over_inferiors.
(darwin_nat_target::wait): Call wait_1 instead of darwin_wait.
(darwin_stop_inferior): Rename to...
(darwin_nat_target::stop_inferior): ... this.
(darwin_nat_target::kill): Call wait_1 instead of darwin_wait.
(darwin_init_thread_list): Rename to...
(darwin_nat_target::init_thread_list): ... this.
(darwin_ptrace_him): Rename to...
(darwin_nat_target::ptrace_him): ... this.
(darwin_nat_target::create_inferior): Pass lambda function to
fork_inferior.
(darwin_nat_target::detach): Call stop_inferior instead of
darwin_stop_inferior.
* fork-inferior.h (fork_inferior): Change init_trace_fun
parameter to gdb::function_view.
* fork-inferior.c (fork_inferior): Likewise.
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Each time a dll is loaded, update_solib_list is called.
This in turn calls deep down xfer_partial -> windows_xfer_shared_libraries,
which calls windows_xfer_shared_library for each loaded dll,
and pe_text_section_offset reads the dll for the text section offset.
Also if the data provided by xfer_partial is bigger than 4K,
then all of this is done for each 4K chunk (see target_read_alloc_1).
Caching of the text section offset improves the startup time of
an application with >300 dynamically loaded plugins from 2m10s to 10s.
And the shutdown time improves from 2m to 2s.
gdb/ChangeLog:
2020-01-23 Hannes Domani <ssbssa@yahoo.de>
* i386-cygwin-tdep.c (core_process_module_section): Update.
* windows-nat.c (struct lm_info_windows): Add text_offset.
(windows_xfer_shared_libraries): Update.
* windows-tdep.c (windows_xfer_shared_library):
Add text_offset_cached argument.
* windows-tdep.h (windows_xfer_shared_library): Update.
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|
|
PR 25444
* elf.c (assign_file_positions_for_load_sections): Avoid divide
by zero when p_align is zero.
|
|
bfd/
2020-01-22 Maxim Blinov <maxim.blinov@embecosm.com>
* bfd/elfnn-riscv.c (riscv_skip_prefix): New.
(riscv_prefix_cmp): Likewise.
(riscv_non_std_ext_p): Deleted.
(riscv_std_sv_ext_p): Likewise.
(riscv_non_std_sv_ext_p): Likewise.
(riscv_merge_non_std_and_sv_ext): Rename to...
(riscv_merge_multi_letter_ext): and modified to use riscv_prefix_cmp.
(riscv_merge_arch_attr_info): Replace 3 calls to
riscv_merge_non_std_and_sv_ext with single call to
riscv_merge_multi_letter_ext.
* bfd/elfxx-riscv.c (riscv_parse_std_ext): Break if we
encounter a 'z' prefix.
(riscv_get_prefix_class): New function, return prefix class based
on first few characters of input string.
(riscv_parse_config): New structure to factor out minor differences
in extension class parsing behaviour.
(riscv_parse_sv_or_non_std_ext): Rename to...
(riscv_parse_prefixed_ext): and parameterise with
riscv_parse_config.
(riscv_std_z_ext_strtab, riscv_std_s_ext_strtab): New.
(riscv_multi_letter_ext_valid_p): New.
(riscv_ext_x_valid_p, riscv_ext_z_valid_p, riscv_ext_s_valid_p): New.
(riscv_parse_subset): Delegate all non-single-letter parsing work
to riscv_parse_prefixed_ext.
* bfd/elfxx-riscv.h (riscv_isa_ext_class): New type.
(riscv_get_prefix_class): Declare.
gas/
2020-01-22 Maxim Blinov <maxim.blinov@embecosm.com>
* testsuite/gas/riscv/march-ok-s.d: sx is no longer valid and
s exts must be known, so rename *ok* to *fail*.
* testsuite/gas/riscv/march-ok-sx.d: Likewise.
* testsuite/gas/riscv/march-ok-s-with-version: Likewise.
* testsuite/gas/riscv/march-fail-s.l: Expected error messages for
above change.
* testsuite/gas/riscv/march-fail-sx.l: Likewise.
* testsuite/gas/riscv/march-fail-sx-with-version.l: Likewise.
Change-Id: Ic4d91a13d055a10d30ab28752a380a669b59f29c
|
|
|
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The MSP430X RRUX instruction (unsigned right shift) is synthesized as
the RRC (rotate right through carry) instruction, but with the ZC
(zero carry) bit of the opcode extention word set.
Ensure the carry flag is ignored when the ZC bit is set.
sim/msp430/ChangeLog:
2020-01-22 Jozef Lawrynowicz <jozef.l@mittosystems.com>
* msp430-sim.c (msp430_step_once): Ignore the carry flag when executing
an RRC instruction, if the ZC bit of the extension word is set.
sim/testsuite/sim/msp430/ChangeLog:
2020-01-22 Jozef Lawrynowicz <jozef.l@mittosystems.com>
* rrux.s: New test.
|
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In 64-bit mode, double word suffix in mnemonic with word general register
is disallowed. Otherwise, assembler gives a warning:
$ cat /tmp/x.s
movl %ax, %bx
movl %ds, %ax
movl %ax, %cs
$ gcc -c /tmp/x.s
/tmp/x.s: Assembler messages:
/tmp/x.s:1: Error: incorrect register `%bx' used with `l' suffix
/tmp/x.s:2: Error: incorrect register `%ax' used with `l' suffix
/tmp/x.s:3: Error: incorrect register `%ax' used with `l' suffix
$ gcc -c /tmp/x.s -m32
/tmp/x.s: Assembler messages:
/tmp/x.s: Assembler messages:
/tmp/x.s:1: Warning: using `%ebx' instead of `%bx' due to `l' suffix
/tmp/x.s:1: Warning: using `%eax' instead of `%ax' due to `l' suffix
/tmp/x.s:2: Warning: using `%eax' instead of `%ax' due to `l' suffix
/tmp/x.s:3: Warning: using `%eax' instead of `%ax' due to `l' suffix
This patch makes it a hard error in all modes. Now we get:
$ gcc -c /tmp/x.s -m32
/tmp/x.s: Assembler messages:
/tmp/x.s:1: Error: incorrect register `%bx' used with `l' suffix
/tmp/x.s:2: Error: incorrect register `%ax' used with `l' suffix
/tmp/x.s:3: Error: incorrect register `%ax' used with `l' suffix
PR gas/25438
* config/tc-i386.c (check_long_reg): Always disallow double word
suffix in mnemonic with word general register.
* testsuite/gas/i386/general.s: Replace word general register
with double word general register for movl.
* testsuite/gas/i386/inval.s: Add tests for movl with word general
register.
* testsuite/gas/i386/general.l: Updated.
* testsuite/gas/i386/inval.l: Likewise.
|
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After fixing:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93319
https://sourceware.org/bugzilla/show_bug.cgi?id=25416
-mtls-dialect=gnu2 is working for x32 with GCC 10. Skip GNU2 TLS tests
only if compiler doesn't support it.
PR ld/25416
* testsuite/ld-x86-64/tls.exp: Skip GNU2 TLS tests only without
compiler support.
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This provides a linker generated __tls_get_addr_desc wrapper function
preserving registers around a __tls_get_addr call. The idea being to
support __tls_get_addr_desc without requiring a glibc update.
bfd/
* elf64-ppc.c (struct ppc_link_hash_table): Add tga_group.
(ppc64_elf_archive_symbol_lookup): Extract __tls_get_addr_opt for
__tls_get_addr_desc.
(ppc64_elf_size_stubs): Add section for linker generated
__tls_get_addr_desc wrapper function. Loop at least once if
generating this function.
(emit_tga_desc, emit_tga_desc_eh_frame): New functions.
(ppc64_elf_build_stubs): Generate __tls_get_addr_desc.
ld/
* testsuite/ld-powerpc/tlsdesc3.d,
* testsuite/ld-powerpc/tlsdesc3.wf,
* testsuite/ld-powerpc/tlsdesc4.d,
* testsuite/ld-powerpc/tlsdesc4.s,
* testsuite/ld-powerpc/tlsdesc4.wf: New tests.
* testsuite/ld-powerpc/powerpc.exp: Run them.
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|
This implements register saving and restoring in the __tls_get_addr
call stub, so that when glibc supports the optimized tls call stub gcc
can generate code that assumes only r0, r12 and of course r3 are
changed on a __tls_get_addr call. When gcc expects __tls_get_addr
calls to preserve registers the call will be to __tls_get_addr_desc,
which will be translated by the linker to a call to __tls_get_addr_opt.
bfd/
* elf64-ppc.h (struct ppc64_elf_params): Add no_tls_get_addr_regsave.
* elf64-ppc.c (struct ppc_link_hash_table): Add tga_desc and
tga_desc_fd.
(is_tls_get_addr): Match tga_desc and tga_desc_df too.
(STDU_R1_0R1, ADDI_R1_R1): Define.
(tls_get_addr_prologue, tls_get_addr_epilogue): New functions.
(ppc64_elf_tls_setup): Set up tga_desc and tga_desc_fd. Indirect
tga_desc_fd to opt_fd, and tga_desc to opt. Set
no_tls_get_addr_regsave.
(branch_reloc_hash_match): Add hash3 and hash4.
(ppc64_elf_tls_optimize): Handle tga_desc_fd and tga_desc too.
(ppc64_elf_size_dynamic_sections): Likewise.
(ppc64_elf_relocate_section): Likewise.
(plt_stub_size, build_plt_stub): Likewise. Size regsave
__tls_get_addr stub.
(build_tls_get_addr_stub): Build regsave __tls_get_addr stub and
eh_frame.
(ppc_size_one_stub): Handle tga_desc_fd and tga_desc too. Size
eh_frame for regsave __tls_get_addr.
gas/
* config/tc-ppc.c (parse_tls_arg): Handle tls arg for
__tls_get_addr_desc and __tls_get_addr_opt.
ld/
* emultempl/ppc64elf.em (ppc64_opt, PARSE_AND_LIST_LONGOPTS),
(PARSE_AND_LIST_OPTIONS, PARSE_AND_LIST_ARGS_CASES): Support
--tls-get-addr-regsave and --no-tls-get-addr-regsave.
(params): Init new field.
* ld.texi (--tls-get-addr-regsave, --no-tls-get-addr-regsave):
Document.
* testsuite/ld-powerpc/tlsdesc.s,
* testsuite/ld-powerpc/tlsdesc.d,
* testsuite/ld-powerpc/tlsdesc.wf,
* testsuite/ld-powerpc/tlsdesc2.d,
* testsuite/ld-powerpc/tlsdesc2.wf,
* testsuite/ld-powerpc/tlsexenors.d,
* testsuite/ld-powerpc/tlsexenors.r,
* testsuite/ld-powerpc/tlsexers.d,
* testsuite/ld-powerpc/tlsexers.r,
* testsuite/ld-powerpc/tlsexetocnors.d,
* testsuite/ld-powerpc/tlsexetocrs.d,
* testsuite/ld-powerpc/tlsexetocrs.r,
* testsuite/ld-powerpc/tlsopt6.d,
* testsuite/ld-powerpc/tlsopt6.wf: New.
* testsuite/ld-powerpc/powerpc.exp: Run new tests.
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When linking with --no-tls-optimize the linker doesn't generate a call
or long branch stub to __tls_get_addr in some circumstances, giving:
relocation truncated to fit: R_PPC64_REL24 against symbol `__tls_get_addr'
* elf64-ppc.c (ppc64_elf_size_stubs): Correct condition under
which __tls_get_addr calls will be eliminated.
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PR 25417
binutils/
* readelf.c (get_alpha_symbol_other): Fix error message typo.
ld/
* ldlang.c (ldlang_open_ctf): Fix error message typo.
* emultempl/z80elf.em (z80_elf_after_open): Likewise.
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Linux program headers may look like
Section to Segment mapping:
Segment Sections...
00 .note.gnu.property .text
01 .note.gnu.property
02 .note.gnu.property
or
Section to Segment mapping:
Segment Sections...
00 .note.gnu.property
01 .text
02 .note.gnu.property
03 .note.gnu.property
Update pr23900-1.d to accept both.
* testsuite/ld-elf/pr23900-1.d: Adjusted.
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In commit
gdb: add back declarations for _initialize functions
6c2659886f7018fcca26ee0fc813bc9748fb8513
I wrongfully edited gdbarch.c, instead of editing gdbarch.sh and
re-generating gdbarch.c. This patch fixes gdbarch.sh to add a
declaration for _initialize_gdbarch. gdbarch.c is not changed, as the
output of gdbarch.sh now matches the current state of gdbarch.c.
gdb/ChangeLog:
* gdbarch.sh: Add declaration for _initialize_gdbarch.
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This removes the two uses of iterate_over_inferiors, in favor of
range-based loops.
gdb/ChangeLog:
* remote-sim.c (check_for_duplicate_sim_descriptor): Remove.
(get_sim_inferior_data): Remove use of iterate_over_inferiors,
replace with range-based for.
(gdbsim_interrupt_inferior): Remove.
(gdbsim_target::interrupt): Replace iterate_over_inferiors use
with a range-based for. Inline code from
gdbsim_interrupt_inferior.
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I noticed the indentation there was off, this patch fixes it.
gdb/ChangeLog:
* infrun.c (proceed): Fix indentation.
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While GNU Source Highlight is good, it's also difficult to build and
distribute. For one thing, it needs Boost. For another, it has an
unusual configuration and installation setup.
Pygments, a Python library, doesn't suffer from these issues, and so I
thought it would be a reasonable fallback.
This patch implements this idea. GNU Source Highlight is preferred,
but if it is unavailable (or fails), the extension languages are
tried. This patch also implements support for Pygments.
Something similar could be done for Guile, using:
https://dthompson.us/projects/guile-syntax-highlight.html
However, I don't know enough about Guile internals to make this
happen, so I have not done it here.
gdb/ChangeLog
2020-01-21 Tom Tromey <tromey@adacore.com>
* source-cache.c (source_cache::ensure): Call ext_lang_colorize.
* python/python.c (python_extension_ops): Update.
(gdbpy_colorize): New function.
* python/lib/gdb/__init__.py (colorize): New function.
* extension.h (ext_lang_colorize): Declare.
* extension.c (ext_lang_colorize): New function.
* extension-priv.h (struct extension_language_ops) <colorize>: New
member.
* cli/cli-style.c (_initialize_cli_style): Update help text.
Change-Id: I5e21623ee05f1f66baaa6deaeca78b578c031bf4
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Also pass -l to readelf to check PT_GNU_PROPERTY program header.
PR ld/23900
* testsuite/ld-elf/pr23900-1.d: Also pass -l to readelf.
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The odd behavior of certain COFF/PE targets makes necessary some
mechanical adjustments.
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As suggested, the cond variable is really supposed to be a bool. So,
make it so.
gdb/ChangeLog:
2020-01-21 Luis Machado <luis.machado@linaro.org>
* aarch64-tdep.c (struct aarch64_displaced_step_closure)
<cond>: Change type to bool.
(aarch64_displaced_step_b_cond): Update cond to use bool type.
(aarch64_displaced_step_cb): Likewise.
(aarch64_displaced_step_tb): Likewise.
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While debugging the step-over-syscall problem, i wanted to see a bit more
debugging output to try to determine the root cause.
This patch does this.
gdb/ChangeLog:
2020-01-21 Luis Machado <luis.machado@linaro.org>
* aarch64-tdep.c (aarch64_displaced_step_fixup): Add more debugging
output.
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In particular, this one:
FAIL: gdb.base/step-over-syscall.exp: fork: displaced=on: check_pc_after_cross_syscall: single step over fork final pc
When ptrace fork event reporting is enabled, GDB gets a PTRACE_EVENT_FORK
event whenever the inferior executes the fork syscall.
Then the logic is that GDB needs to step the inferior yet again in order to
receive a predetermined SIGTRAP, but no execution takes place because the
signal was already queued for delivery. That means the PC should stay the same.
I noticed the aarch64 code is currently adjusting the PC in this situation,
making the inferior skip an instruction without executing it.
The following change checks if we did not execute the instruction
(pc - to == 0), making proper adjustments for such case.
Regression tested on aarch64-linux-gnu on the tryserver.
gdb/ChangeLog:
2020-01-21 Luis Machado <luis.machado@linaro.org>
* aarch64-tdep.c (struct aarch64_displaced_step_closure )
<pc_adjust>: Adjust the documentation.
(aarch64_displaced_step_fixup): Check if PC really moved before
adjusting it.
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There's no need (anymore?) to heavily special case this - just make
generic logic consider only its first operand, and deal with the case
of an 'l' suffix not being allowed in a pattern.
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Commit b76bc5d54e ("x86: don't default variable shift count insns to
8-bit operand size") pointed out a very bad case, but the underlying
problem is, as mentioned on various occasions, much larger: Silently
selecting a (nowhere documented afaict) certain default operand size
when there's no "sizing" suffix and no suitable register operand(s) is
simply dangerous (for the programmer to make mistakes).
While in Intel syntax mode such mistakes already lead to an error (which
is going to remain that way), AT&T syntax mode now gains warnings in
such cases by default, which can be suppressed or promoted to an error
if so desired by the programmer. Furthermore at least general purpose
insns now consistently have a default applied (alongside the warning
emission), rather than accepting some and refusing others.
No warnings are (as before) to be generated for "DefaultSize" insns as
well as ones acting on selector and other fixed-width values. For
SYSRET, however, the DefaultSize needs to be dropped - it had been
wrongly put there in the first place, as it's unrelated to .code16gcc
(no stack accesses involved).
As set forth as a prereq when I first mentioned this intended change a
few years back, Linux as well as gcc have meanwhile been patched to
avoid (emission of) ambiguous operands (and hence triggering of the new
warning).
Note that I think that in 64-bit mode IRET and far RET would better get
a diagnostic too, as it's reasonably likely that a suffix-less instance
really is meant to be a 64-bit one. But I guess I better make this a
separate follow-on patch.
Note further that floating point operations with integer operands are an
exception for now: They continue to use short (16-bit) operands by
default even in 32- and 64-bit modes.
Finally note that while {,V}PCMPESTR{I,M} would, strictly speaking, also
need to be diagnosed, with their 64-bit forms not being very useful I
think it is better to continue to avoid warning about them (by way of
them carrying IgnoreSize attributes).
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Just like other VCVT*{X,Y} templates do, and to allow the programmer
flexibility (might be relevant in particular when heavily macro-izing
code), the two templates should also have Broadcast set, just like their
X/Y-suffix-less counterparts. This in turn requires them to also have
* Dword set on their memory operands, to cover the logic added to
i386gen by 4a1b91eabbe7 ("x86: Expand Broadcast to 3 bits"),
* RegXMM/RegYMM set on their source operands, to satisfy broadcast
sizing logic in gas itself.
Otherwise ATTSyntax templates wouldn't need such operand size attributes.
While extending the test cases, also add Intel syntax broadcast forms
without explicit size specifiers.
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