Peter Bergner [Mon, 11 May 2020 00:01:40 +0000 (09:31 +0930)]
Power10 byte reverse instructions
opcodes/
* ppc-opc.c (powerpc_opcodes) <brd, brh, brw>: New mnemonics.
gas/
* testsuite/gas/ppc/byte_rev.d,
* testsuite/gas/ppc/byte_rev.s: New test.
* testsuite/gas/ppc/ppc.exp: Run it.
Peter Bergner [Sun, 10 May 2020 23:57:48 +0000 (09:27 +0930)]
Power10 Add new L operand to the slbiag instruction
opcodes/
* ppc-opc.c (powerpc_opcodes) <slbiag>: Add variant with L operand.
gas/
* testsuite/gas/ppc/power10.s: New test.
* testsuite/gas/ppc/power10.d: Likewise.
* testsuite/gas/ppc/ppc.exp: Run it.
Alan Modra [Mon, 11 May 2020 08:30:31 +0000 (18:00 +0930)]
PR25961, buffer overflow in coff_swap_aux_in
PR 25961
* coffgen.c (coff_get_normalized_symtab): Check that buffer
contains required number of auxents before processing any auxent.
* coffswap.h (coff_swap_aux_in <C_FILE>): Only swap in extended
file name from auxents for PE.
Name of fortran main function for Flang compiler is MAIN_ while
for gfortran it is MAIN__ . In test cases MAIN__ is hardcoded for
the purpose of inserting breakpoint.
New proc is added to detect main function name depending on the
compiler used.
Fortran specific version of runto_main named fortran_runto_main
is added.
This commit adds support for Flang main function, there should be
no change for gfortran.
Tom de Vries [Sat, 9 May 2020 18:17:10 +0000 (20:17 +0200)]
[gdb] Fix catch throw regexp matching
When running test-case gdb.mi/mi-catch-cpp-exceptions.exp, we have:
...
FAIL: gdb.mi/mi-catch-cpp-exceptions.exp: all with invalid regexp: run until \
breakpoint in main (unknown output after running)
...
This is a regression since commit 596dc4adff "Speed up psymbol reading by
removing a copy".
Before that commit, we have:
...
$ gdb \
-batch \
./outputs/gdb.mi/mi-catch-cpp-exceptions/mi-catch-cpp-exceptions \
-ex "break 67" \
-ex "catch throw -r blahblah" \
-ex r
Breakpoint 1 at 0x4008e5: file mi-catch-cpp-exceptions.cc, line 67.
Catchpoint 2 (throw)
Breakpoint 1, main () at mi-catch-cpp-exceptions.cc:67
67 return 1; /* Stop here. */
...
In other words:
- we set a breakpoint somewhere in main,
- we set a catchpoint with a regexp that is intended to not match any
exception, and
- run to the breakpoint, without the catchpoint triggering.
After the commit, we have:
...
$ gdb \
-batch \
./outputs/gdb.mi/mi-catch-cpp-exceptions/mi-catch-cpp-exceptions \
-ex "break 67" \
-ex "catch throw -r blahblah" \
-ex r
Breakpoint 1 at 0x4008e5: file mi-catch-cpp-exceptions.cc, line 67.
Catchpoint 2 (throw)
Catchpoint 2 (exception thrown), 0x00007ffff7ab037e in __cxa_throw () from \
/usr/lib64/libstdc++.so.6
...
In other words, the catchpoint triggers.
This is caused by this bit of the commit:
...
type_name = cplus_typename_from_type_info (typeinfo_arg);
- if (!type_name.empty ())
+ if (name != nullptr)
{
- if (self->pattern->exec (type_name.c_str (), 0, NULL, 0) != 0)
+ if (self->pattern->exec (name, 0, NULL, 0) != 0)
...
Before the commit, we have:
- type_name == "my_exception"
- canon = ""
and the !type_name.empty () test succeeds, and gdb executes the
self->pattern->exec call.
After the commit, we have:
- type_name == "my_exception"
- canon == NULL
- name == NULL
and the name != nullptr test fails, and gdb doesn't execute the
self->pattern->exec call.
Fix this by inverting the condition for the calculation of name:
...
- name = (canon == nullptr
+ name = (canon != nullptr
...
Build and tested on x86_64-linux.
gdb/ChangeLog:
2020-05-09 Tom de Vries <tdevries@suse.de>
PR gdb/25955
* break-catch-throw.c (check_status_exception_catchpoint): Fix name
calculation.
nitachra [Sat, 9 May 2020 08:03:51 +0000 (10:03 +0200)]
Fix for the complaint observed when symbol reading due to unsupported .debug_names form
Following complaint is observed with the executable compiled with -gdwarf-5
and -gpubnames flags - "During symbol reading: Unsupported .debug_names form
DW_FORM_ref4". This is the form corresponding to DW_IDX_die_offset attribute.
This patch fixes this complaint. Tested with clang 10.0.0. Test case used -
int main()
{
int sum,a,b;
sum = a + b;
return sum;
}
Reading symbols from test.out...
During symbol reading: Unsupported .debug_names form DW_FORM_ref4 \
[in module test.out]
Temporary breakpoint 1 at 0x400484
Starting program: test.out
During symbol reading: Unsupported .debug_names form DW_FORM_ref4 \
[in module test.out]
During symbol reading: Unsupported .debug_names form DW_FORM_ref4 \
[in module test.out]
During symbol reading: Unsupported .debug_names form DW_FORM_ref4 \
[in module test.out]
gdb/dwarf2/ChangeLog:
2020-05-09 Nitika Achra <Nitika.Achra@amd.com>
PR symtab/25952
* read.c (dw2_debug_names_iterator::next): Handle DW_FORM_ref*
and DW_IDX_die_offset. If there is no compilation unit attribute in
the index entry, then there is a single CU. Return the CU at O index
of compilation unit vector.
Tom Tromey [Fri, 8 May 2020 20:26:11 +0000 (14:26 -0600)]
Don't re-process a DIE in read_lexical_block_scope
A customer reported a crash in the DWARF reader.
Investigation showed that the crash occurred in an unusual scenario: a
function was lexically scoped within some other function -- but the
inner function inlined the outer function and referred to its DIE via
DW_AT_abstract_origin. With the executable in question,
inherit_abstract_dies could eventually call read_lexical_block_scope,
which in turn could recurse into process_die, to process a DIE that
was already being read, triggering an assert.
However, in this case, I don't have an easy way to reproduce. So,
there is no test case.
I did experiment with the failing executable. This patch fixes the
bug and doesn't seem to cause other issues. For example, I can still
set breakpoints on the relevant functions.
gdb/ChangeLog
2020-05-08 Tom Tromey <tromey@adacore.com>
* dwarf2/read.c (read_lexical_block_scope): Don't process a DIE
already being processed.
Tom Tromey [Fri, 8 May 2020 20:21:22 +0000 (14:21 -0600)]
More C++-ification for struct display
This changes displays to have a constructor, use bool and std::string,
and to be stored using std::vector. The ALL_DISPLAYS and
ALL_DISPLAYS_SAFE macros are removed. While internal iteration is
still done via map_display_numbers, this is updated to use a
function_view. These changes simplify the code somewhat; for example,
free_display can now be removed in favor of ordinary destruction.
gdb/ChangeLog
2020-05-08 Tom Tromey <tom@tromey.com>
* printcmd.c (struct display) <next>: Remove.
<display>: New constructor.
<exp_string>: Now a std::string.
<enabled_p>: Now a bool.
(display_number): Move definition earlier.
(displays): Rename from display_chain. Now a std::vector.
(ALL_DISPLAYS, ALL_DISPLAYS_SAFE): Remove.
(display_command): Update.
(do_one_display, disable_display)
(enable_disable_display_command, do_enable_disable_display):
Update.
(free_display): Remove.
(clear_displays): Rewrite.
(delete_display): Update.
(map_display_numbers): Use function_view. Remove "data"
parameter. Update.
(do_delete_display): Remove.
(undisplay_command): Update.
(do_one_display, do_displays, disable_display)
(info_display_command): Update.
(do_enable_disable_display): Remove.
(enable_disable_display_command)
(clear_dangling_display_expressions): Update.
Tom Tromey [Fri, 8 May 2020 20:21:22 +0000 (14:21 -0600)]
Remove ALL_PSPACES
This removes the ALL_PSPACES macro. In this case it seemed cleanest
to change how program spaces are stored -- instead of using a linked
list, they are now stored in a std::vector.
gdb/ChangeLog
2020-05-08 Tom Tromey <tom@tromey.com>
Tom Tromey [Fri, 8 May 2020 20:21:22 +0000 (14:21 -0600)]
Remove ALL_SO_LIBS and so_list_head
This patch started as an attempt to replace ALL_SO_LIBS with an
ordinary C++ iterator. However, then I tripped over the so_list_head
define again, and decided to remove it as well.
gdb/ChangeLog
2020-05-08 Tom Tromey <tom@tromey.com>
Tom Tromey [Fri, 8 May 2020 20:21:22 +0000 (14:21 -0600)]
Remove ALL_EXTENSION_LANGUAGES and ALL_ENABLED_EXTENSION_LANGUAGES
This removes the ALL_EXTENSION_LANGUAGES and
ALL_ENABLED_EXTENSION_LANGUAGES macros, in favor of ordinary
iterators. For ALL_ENABLED_EXTENSION_LANGUAGES, I chose to simply
inline the check, as that seemed simpler than trying to make
filtered_iterator work for std::array. (As an aside, this sort of
thing will be easier once we can use the ranges library...)
gdb/ChangeLog
2020-05-08 Tom Tromey <tom@tromey.com>
Tom Tromey [Fri, 8 May 2020 20:14:05 +0000 (14:14 -0600)]
Speed up psymbol reading by removing a copy
I noticed that cp_canonicalize_string and friends copy a
unique_xmalloc_ptr to a std::string. However, this copy isn't
genuinely needed anywhere, and it serves to slow down DWARF psymbol
reading.
This patch removes the copy and updates the callers to adapt.
This speeds up the reader from 1.906 seconds (mean of 10 runs, of gdb
on a copy of itself) to 1.888 seconds (mean of 10 runs, on the same
copy as the first trial).
gdb/ChangeLog
2020-05-08 Tom Tromey <tom@tromey.com>
Tom de Vries [Fri, 8 May 2020 15:26:32 +0000 (17:26 +0200)]
[gdb] Fix stepping over fork with follow-fork-mode child and gcc-8
When running test-case gdb.threads/fork-child-threads.exp with gcc-8 instead
of gcc-7, we have:
...
(gdb) next^M
[Attaching after Thread 0x7ffff7fae740 (LWP 27574) fork to child process \
27578]^M
[New inferior 2 (process 27578)]^M
[Detaching after fork from parent process 27574]^M
[Inferior 1 (process 27574) detached]^M
[Thread debugging using libthread_db enabled]^M
Using host libthread_db library "/lib64/libthread_db.so.1".^M
[Switching to Thread 0x7ffff7fae740 (LWP 27578)]^M
-main () at src/gdb/testsuite/gdb.threads/fork-child-threads.c:41^M
+main () at src/gdb/testsuite/gdb.threads/fork-child-threads.c:34^M
-41 i = pthread_create (&thread, NULL, start, NULL);^M
+34 switch (fork ())^M
-(gdb) PASS: gdb.threads/fork-child-threads.exp: next over fork
+(gdb) FAIL: gdb.threads/fork-child-threads.exp: next over fork
...
This is due to the fact that gcc-8 generates more precise line info, making
the instruction after the call to fork a "recommended breakpoint location".
However, it is a bug because next is supposed to move to the next source
line.
The problem is that in process_event_stop_test we hit this code:
...
if ((ecs->event_thread->suspend.stop_pc == stop_pc_sal.pc)
&& (ecs->event_thread->current_line != stop_pc_sal.line
|| ecs->event_thread->current_symtab != stop_pc_sal.symtab))
{
if (stop_pc_sal.is_stmt)
{
/* We are at the start of a different line. So stop. Note that
we don't stop if we step into the middle of a different line.
That is said to make things like for (;;) statements work
better. */
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: stepped to a different line\n");
end_stepping_range (ecs);
return;
}
...
because current_line and current_symtab have initial values:
...
(gdb) p ecs->event_thread->current_line
$8 = 0
(gdb) p ecs->event_thread->current_symtab
$9 = (symtab *) 0x0
...
Fix this in follow_fork by copying current_line and current_symtab from
parent thread to child thread.
Tested on x86_64-linux, with gcc 7.5.0 and gcc 10.0.1.
gdb/ChangeLog:
2020-05-08 Tom de Vries <tdevries@suse.de>
* infrun.c (follow_fork): Copy current_line and current_symtab to
child thread.
Add test-case with .debug_names section using DW_FORM_ref4.
There's currently no support for .debug_names in the dwarf assembler, so we
use plain _emit rather than something more structured.
Consequently, we cannot use regular declare_labels-generated labels to refer
from .debug_names to .debug_info. Instead, we use labels with a
predefined name, which we generate using _compute_label, and then define using
define_label.
This is the test-case for PR25952, so kfail the corresponding test.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2020-05-08 Tom de Vries <tdevries@suse.de>
* gdb.dwarf2/clang-debug-names.c: New test.
* gdb.dwarf2/clang-debug-names.exp: New file.
Simon Marchi [Thu, 7 May 2020 15:18:42 +0000 (11:18 -0400)]
gdb: remove TYPE_DYN_PROP_LIST macro
Remove this macro, which abstracts how to obtain the dyn_prop_list of a
given type. We could replace it with a method on `struct type`, but I
don't think it's needed, as the only code that accesses the dynamic prop
list directly is internal gdbtypes.c code (that can be seen as code
internal to `struct type`). So it can just refer to the field directly.
gdb/ChangeLog:
* gdbtypes.h (TYPE_DYN_PROP_LIST): Remove. Update all users
access thistype->main_type->dyn_prop_list directly.
Andrew Burgess [Tue, 5 May 2020 14:48:13 +0000 (15:48 +0100)]
objcopy: Mention 'entry address' in description
The ELF header contains a start address, which is also sometimes
called the entry address. The 'objdump -x' output calls this field
the 'start address', while readelf calls it 'entry point address'.
The linker talks about setting the 'entry' point in its manual.
I've always thought of this field as the 'entry address', and so when
I recently wanted to know if objcopy could adjust this field I opened
up the manual and searched for 'entry', which found no hits.
I thought it would be useful (for people like me) if the description
of 'set-start' and 'adjust-start' in the objcopy manual mentioned the
word 'entry' to make it easier to find.
binutils/ChangeLog:
* doc/binutils.texi: Mention 'entry address' in the set-start and
adjust-start options descriptions.
Simon Marchi [Wed, 6 May 2020 16:01:37 +0000 (12:01 -0400)]
gdb: handle endbr64 instruction in amd64_analyze_prologue
v2:
- test: build full executable instead of object
- test: add and use supports_fcf_protection
- test: use gdb_test_multiple's -wrap option
- test: don't execute gdb_assert if failed to get breakpoint address
Some GCCs now enable -fcf-protection by default. This is the case, for
example, with GCC 9.3.0 on Ubuntu 20.04. Enabling it causes the
`endbr64` instruction to be inserted at the beginning of all functions
and that breaks GDB's prologue analysis.
I noticed this because it gives many failures in gdb.base/break.exp.
But let's take this dummy program and put a breakpoint on main:
int main(void)
{
return 0;
}
Without -fcf-protection, the breakpoint is correctly put after the prologue:
$ gcc test.c -g3 -O0 -fcf-protection=none
$ ./gdb -q -nx --data-directory=data-directory a.out
Reading symbols from a.out...
(gdb) disassemble main
Dump of assembler code for function main:
0x0000000000001129 <+0>: push %rbp
0x000000000000112a <+1>: mov %rsp,%rbp
0x000000000000112d <+4>: mov $0x0,%eax
0x0000000000001132 <+9>: pop %rbp
0x0000000000001133 <+10>: retq
End of assembler dump.
(gdb) b main
Breakpoint 1 at 0x112d: file test.c, line 3.
With -fcf-protection, the breakpoint is incorrectly put on the first
byte of the function:
$ gcc test.c -g3 -O0 -fcf-protection=full
$ ./gdb -q -nx --data-directory=data-directory a.out
Reading symbols from a.out...
(gdb) disassemble main
Dump of assembler code for function main:
0x0000000000001129 <+0>: endbr64
0x000000000000112d <+4>: push %rbp
0x000000000000112e <+5>: mov %rsp,%rbp
0x0000000000001131 <+8>: mov $0x0,%eax
0x0000000000001136 <+13>: pop %rbp
0x0000000000001137 <+14>: retq
End of assembler dump.
(gdb) b main
Breakpoint 1 at 0x1129: file test.c, line 2.
Stepping in amd64_skip_prologue, we can see that the prologue analysis,
for GCC-compiled programs, is done in amd64_analyze_prologue by decoding
the instructions and looking for typical patterns. This patch changes
the analysis to check for a prologue starting with the `endbr64`
instruction, and skip it if it's there.
gdb/ChangeLog:
* amd64-tdep.c (amd64_analyze_prologue): Check for `endbr64`
instruction, skip it if it's there.
gdb/testsuite/ChangeLog:
* gdb.arch/amd64-prologue-skip-cf-protection.exp: New file.
* gdb.arch/amd64-prologue-skip-cf-protection.c: New file.
Tom de Vries [Wed, 6 May 2020 12:48:50 +0000 (14:48 +0200)]
[gdb/testsuite] Fix gdb.reverse/consecutive-{precsave,reverse}.exp with gcc-8
When running test-cases gdb.reverse/consecutive-precsave.exp and
gdb.reverse/consecutive-reverse.exp with gcc-8, we get:
...
FAIL: gdb.reverse/consecutive-precsave.exp: stopped at bp, 2nd instr
FAIL: gdb.reverse/consecutive-reverse.exp: stopped at bp, 2nd instr
...
These FAILs are duplicates of the FAILs fixed in commit 7c99e7e2b08
"[gdb/testsuite] Fix gdb.base/consecutive.exp with gcc-8".
Fix these in the same manner.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2020-05-06 Tom de Vries <tdevries@suse.de>
* gdb.reverse/consecutive-precsave.exp: Handle if instruction after
breakpoint is at a "recommended breakpoint location".
* gdb.reverse/consecutive-reverse.exp: Same.
Tom de Vries [Wed, 6 May 2020 12:27:36 +0000 (14:27 +0200)]
[gdb/testsuite] Fix gdb.base/watchpoint-reuse-slot.exp with gcc-8
When running test-case gdb.base/watchpoint-reuse-slot.exp with gcc-8 instead
of gcc-7, we have:
...
(gdb) PASS: $conf: watch *(buf.byte + 0 + 0)@1
stepi^M
-0x00000000004004b9 34 for (i = 0; i < 100000; i++);^M
+34 for (i = 0; i < 100000; i++);^M
-(gdb) PASS: $conf: stepi advanced
+(gdb) FAIL: $conf: stepi advanced
...
where $conf is "gdb.base/watchpoint-reuse-slot.exp: hw-watch: always-inserted
off: watch x watch: : width 1, iter 0: base + 0".
This is due to the fact that gcc-8 generates more precise line info, making
the instruction at 0x4004b9 a "recommended breakpoint location", such that gdb
no longer prints the instruction address.
Fix this by getting the instruction address by printing $pc.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2020-05-06 Tom de Vries <tdevries@suse.de>
* gdb.base/watchpoint-reuse-slot.exp (stepi): Print $pc to get current
address.
Tom de Vries [Wed, 6 May 2020 12:13:02 +0000 (14:13 +0200)]
[gdb/testsuite] Fix cur_addr update in gdb.base/watchpoint-reuse-slot.exp
I noticed this code in gdb.base/watchpoint-reuse-slot.exp, proc stepi:
...
gdb_test_multiple "stepi" $test {
-re "($hex).*[string_to_regexp $srcline]\r\n$gdb_prompt $" {
set addr $expect_out(1,string)
if {$addr != $cur_addr} {
pass $test
} else {
fail $test
}
set cur_addr addr
}
}
...
The variable cur_addr is documented as:
...
# The address the program is stopped at currently.
set cur_addr ""
...
but in the gdb_test_multiple clause we assign the string "addr" to cur_addr,
while $addr contains the current address.
Tom de Vries [Wed, 6 May 2020 09:50:52 +0000 (11:50 +0200)]
[gdb/testsuite] Fix gdb.base/shlib-call.exp with gcc-8
When running test-case gdb.base/shlib-call.exp with gcc-8 instead of gcc-7, we
have:
...
(gdb) step^M
-main () at /data/gdb_versions/devel/src/gdb/testsuite/gdb.base/shmain.c:42^M
-42 g = mainshr1(g);^M
-(gdb) PASS: gdb.base/shlib-call.exp: step out of shr2 epilogue to main
+main () at /data/gdb_versions/devel/src/gdb/testsuite/gdb.base/shmain.c:41^M
+41 g = shr2(g);^M
+(gdb) FAIL: gdb.base/shlib-call.exp: step out of shr2 epilogue to main
...
This is due to the fact that gcc-8 generates more precise line info, making
the instruction after the call to shr2 at 0x4008f1:
...
4008e4: 8b 05 aa 07 20 00 mov 0x2007aa(%rip),%eax # 601094 <g>
4008ea: 89 c7 mov %eax,%edi
4008ec: e8 1f fe ff ff callq 400710 <shr2@plt>
4008f1: 89 05 9d 07 20 00 mov %eax,0x20079d(%rip) # 601094 <g>
...
a "recommended breakpoint location":
...
[0x00000287] Special opcode 187: advance Address by 13 to 0x4008f1 and \
Line by 0 to 41
...
so when stepping out of shr2, gdb steps back onto line 41, the line containing
the call to shr2.
Fix this by detecting this situation and adding an extra step to reach
line 42.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2020-05-06 Tom de Vries <tdevries@suse.de>
* gdb.base/shlib-call.exp: Add extra step to reach shmain.c:42, if
necessary.
When running test-case gdb.base/shlib-call.exp with clang, we get:
...
gdb compile failed, In file included from shmain.c:6:
unbuffer_output.c:39:1: warning:
control reaches end of non-void function [-Wreturn-type]
}
^
1 warning generated.
...
Fix this by changing the return-type to void.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2020-05-06 Tom de Vries <tdevries@suse.de>
* lib/unbuffer_output.c (gdb_unbuffer_output): Change return type to
void.
Tom de Vries [Wed, 6 May 2020 05:07:47 +0000 (07:07 +0200)]
[gdb/testsuite] Fix gdb.base/consecutive.exp with gcc-8
When running test-case gdb.base/consecutive.exp with gcc-8 instead of gcc-7,
we get:
...
(gdb) step^M
^M
-Breakpoint 3, 0x00000000004004b1 in foo () at consecutive.c:10^M
+Breakpoint 3, foo () at consecutive.c:10^M
10 return a[0] + a[1] + a[2] + a[3] + a[4] + a[5] + a[6];^M
-(gdb) PASS: gdb.base/consecutive.exp: stopped at bp, 2nd instr
+(gdb) FAIL: gdb.base/consecutive.exp: stopped at bp, 2nd instr
...
This is due to the fact that gcc-8 generates more precise line info, making
the breakpoint address a "recommended breakpoint location", and consequently
gdb doesn't print the address prefix anymore.
Fix the FAIL by checking in the test-case whether the breakpoint address is at
"recommended breakpoint location" or not.
gdb/testsuite/ChangeLog:
2020-05-06 Tom de Vries <tdevries@suse.de>
* lib/gdb.exp (is_stmt_addresses, hex_in_list): New proc, factored out
of ...
* gdb.base/async.exp: ... here.
* gdb.base/consecutive.exp: Handle if 2nd breakpoint is at a
"recommended breakpoint location".
Tom de Vries [Wed, 6 May 2020 03:27:48 +0000 (05:27 +0200)]
[gdb/testsuite] Compile compile-ifunc.c with -Wno-attribute-alias
Consider the following test-case:
...
$ cat 1.c
typedef int (*final_t) (int arg);
int final (int arg)
{ return arg + 1; }
final_t gnu_ifunc (void)
{ return final; }
int gnu_ifunc_alias (int) __attribute__ ((ifunc ("gnu_ifunc")));
int main (void)
{ return gnu_ifunc_alias (10); }
...
with result:
...
$ gcc 1.c
$ ./a.out; echo $?
11
...
The test-case uses the ifunc attribute, but there's another solution using
%gnu_indirect_function. Consider 2.c and 3.c:
...
$ cat 2.c
typedef int (*final_t) (int arg);
int final (int arg)
{ return arg + 1; }
asm (".type gnu_ifunc, %gnu_indirect_function");
final_t gnu_ifunc (void)
{ return final; }
$ cat 3.c
extern int gnu_ifunc (int);
int main (void)
{ return gnu_ifunc (10); }
...
However, it can be inconvenient to have seperate files for the incompatible
decls of gnu_ifunc, so we can use this in a single file like this:
...
$ cat 4.c
typedef int (*final_t) (int arg);
int final (int arg)
{ return arg + 1; }
asm (".type gnu_ifunc, %gnu_indirect_function");
final_t gnu_ifunc (void)
{ return final; }
extern int gnu_ifunc_alias (int arg) __attribute__ ((alias ("gnu_ifunc")));
int main (void)
{ return gnu_ifunc_alias (10); }
...
This alias trick works ok at -O0, but not at -O2:
...
$ gcc 4.c
$ ./a.out; echo $?
11
$ gcc 4.c
$ ./a.out; echo $?
176
...
and produces a warning with gcc-8 and later:
...
$ gcc-8 4.c
4.c:7:12: warning: 'gnu_ifunc_alias' alias between functions of incompatible \
types 'int(int)' and 'int (*(void))(int)' [-Wattribute-alias]
extern int gnu_ifunc_alias (int arg) __attribute__ ((alias ("gnu_ifunc")));
^~~~~~~~~~~~~~~
4.c:5:9: note: aliased declaration here
final_t gnu_ifunc (void)
^~~~~~~~~
...
The warning is correct, but the mismatch is intentional.
The last variant (%gnu_indirect_function + alias) is used in
gdb.compile/compile-ifunc.c, so we run into the warning with recent gcc.
Fix the warning by compiling with -Wno-attribute-alias.
Tested the test-case on x86_64-linux with gcc-10, and observed I no longer see
the warning:
...
Running src/gdb/testsuite/gdb.compile/compile-ifunc.exp ...
=== gdb Summary ===
nr of untested testcases 1
...
gdb/testsuite/ChangeLog:
2020-05-06 Tom de Vries <tdevries@suse.de>
* gdb.compile/compile-ifunc.exp: Use -Wno-attribute-alias.
Nick Clifton [Tue, 5 May 2020 15:16:03 +0000 (16:16 +0100)]
Restore readelf's warnings that describe real problems with the file being examined. Fix bug displaying empty file name tables.
binutils* dwarf.c (do_checks): New global variable.
(display_formatted_table): Warn about an unexpected number of
columns in the table, if checks are enabled. Do not complain
about the lack of data following the number of entries in the
table if the table is empty.
(display_debug_lines_decoded): Only warn about an unexpected
number of columns in a table if checks are enabled.
* dwarf.h (do_checks): Add a prototype.
* elfcomm.c (error): Remove weak attribute.
(warn): Likewise.
* readelf.c (do_checks): Delete.
(warn): Delete.
(process_section_headers): Only warn about empty sections if
checks are enabled.
gas * dwarf2dbg.c (out_dir_and_file_list): Add comments describing the
construction of a DWARF-5 directory name table.
* testsuite/gas/elf/pr25917.d: Update expected output.
Gunther Nikl [Mon, 4 May 2020 15:07:26 +0000 (16:07 +0100)]
[PATCH] bfd: tweak SET_ARCH_MACH of aout-cris.c
* aout-cris.c (DEFAULT_ARCH): Delete define.
(MY_set_arch_mach): Likewise.
(SET_ARCH_MACH): Use bfd_set_arch_mach with an explicit architecture
of bfd_arch_cris.
(swap_ext_reloc_in): Add casts to r_index extraction. Mask valid bits
of r_type before the shift.
PR ld/25665
* bfd/elfnn-aarch64.c (group_sections): Copy implementation
from elf32-arm.c.
* testsuite/ld-aarch64/aarch64-elf.exp: Add new test.
* testsuite/ld-aarch64/farcall-group.s: New large group test.
* testsuite/ld-aarch64/farcall-group.d: Likewise.
Nick Clifton [Mon, 4 May 2020 12:50:05 +0000 (13:50 +0100)]
GAS: Do not create an entry for the default directory if the directory table is empty. Improve readelf's decoding of empty directory and file name tables.
PR 25917
* dwarf.c (display_debug_lines_decoded): Warn if encountering a
supicious number of entries for DWARF-5 format directory and file
name tables. Do not display file name table header if the table
is empty. Do not allocate space for empty tables.
gas: PR 25863: Fix scalar vmul inside it block when assembling for MVE
This fixes PR 25863 by fixing the condition in the parsing of vmul in
do_mve_vmull. It also simplifies the code in there fixing latent issues that
would lead to NEON code being accepted when it shouldn't.
gas/ChangeLog:
2020-05-04 Andre Vieira <andre.simoesdiasvieira@arm.com>
PR gas/25863
* config/tc-arm.c (do_mve_vmull): Fix scalar and NEON parsing of vmul.
* testsuite/gas/arm/mve-scalar-vmult-it.d: New test.
* testsuite/gas/arm/mve-scalar-vmult-it.s: New test.
Nick Clifton [Mon, 4 May 2020 09:19:38 +0000 (10:19 +0100)]
Fix an illegal memory access in the assembler when generating a DWARF5 file/directory table with no entries.
PR 25917
* dwarf2dbg.c (out_dir_and_file_list): Check for the directory
table's existence before looking at its entries.
* testsuite/gas/elf/pr25917.s: New test source file.
* testsuite/gas/elf/pr25917.d: New test driver.
* testsuite/gas/elf/elf.exp (run_elf_list_test): Run the new test.
Tom de Vries [Mon, 4 May 2020 06:40:38 +0000 (08:40 +0200)]
[gdb/testsuite] Fix gdb.base/async.exp with gcc-8
When running test-case gdb.base/async.exp with gcc-8, we run into:
...
FAIL: gdb.base/async.exp: stepi&
...
The problem is that with gcc-8, the instruction address is no longer printed:
...
stepi&
-(gdb) 0x00000000004004b2 9 x = 5; x = 5; x = 5;
+(gdb) 9 x = 5; x = 5; x = 5;
completed.
-PASS: gdb.base/async.exp: stepi&
+FAIL: gdb.base/async.exp: stepi&
...
This is due to the fact that gcc-8 contains more precise line info, making the
address being stepped to a "recommended breakpoint location", and consequently
gdb doesn't print the address prefix anymore.
Given that:
- we step through statements on the same line, and
- there's no addres prefix anymore,
this gives the impression of lack of progress, which could be improved upon,
filed as enhancement PR25911 - "Show column when stepping through line".
Fix the FAIL by checking in the test-case whether addresses are at
"recommended breakpoint location" or not.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2020-05-04 Tom de Vries <tdevries@suse.de>
* gdb.base/async.exp: Check whether instruction addresses are a
"recommended breakpoint location".
Tom Tromey [Sun, 3 May 2020 17:31:19 +0000 (11:31 -0600)]
Update more calls to add_prefix_cmd
I looked at all the calls to add_prefix_cmd, and replaced them with
calls to add_basic_prefix_cmd or add_show_prefix_cmd when appropriate.
This makes gdb's command language a bit more regular. I don't think
there's a significant downside.
Note that this patch removes a couple of tests. The removed ones are
completely redundant.
gdb/ChangeLog
2020-05-03 Tom Tromey <tom@tromey.com>
* breakpoint.c (catch_command, tcatch_command): Remove.
(_initialize_breakpoint): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
(set_breakpoint_cmd, show_breakpoint_cmd): Remove
* utils.c (set_internal_problem_cmd, show_internal_problem_cmd):
Remove.
(add_internal_problem_command): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* mips-tdep.c (set_mipsfpu_command): Remove.
(_initialize_mips_tdep): Use add_basic_prefix_cmd.
* dwarf2/index-cache.c (set_index_cache_command): Remove.
(_initialize_index_cache): Use add_basic_prefix_cmd.
* memattr.c (dummy_cmd): Remove.
(_initialize_mem): Use add_basic_prefix_cmd, add_show_prefix_cmd.
* tui/tui-win.c (set_tui_cmd, show_tui_cmd): Remove.
(_initialize_tui_win): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* cli/cli-logging.c (set_logging_command): Remove.
(_initialize_cli_logging): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
(show_logging_command): Remove.
* target.c (target_command): Remove.
(add_target): Use add_basic_prefix_cmd.
gdb/testsuite/ChangeLog
2020-05-03 Tom Tromey <tom@tromey.com>
When running test-case gdb.arch/i386-mpx.exp with gcc-10, we get:
...
Running src/gdb/testsuite/gdb.arch/i386-mpx.exp ...
gdb compile failed, xgcc: warning: switch '-mmpx' is no longer supported
xgcc: warning: switch '-fcheck-pointer-bounds' is no longer supported
...
The test-case uses a combination of options, -mmpx and -fcheck-pointer-bounds.
The -fcheck-pointer-bounds option requires the -mmpx option:
...
$ gcc -fcheck-pointer-bounds ~/hello.c
hello.c:1:0: warning: Pointer Checker requires MPX support on this target. \
Use -mmpx options to enable MPX.
#include <stdio.h>
cc1: error: ‘-fcheck-pointer-bounds’ is not supported for this target
...
Both options is no longer supported in gcc-9.
Fix the warnings by testing if the option combination is supported.
Tested on x86_64-linux, with gcc-7.5.0 and gcc-10.0.1.
gdb/testsuite/ChangeLog:
2020-05-02 Tom de Vries <tdevries@suse.de>
* lib/gdb.exp (supports_mpx_check_pointer_bounds): New proc.
* gdb.arch/i386-mpx-call.exp: Use supports_mpx_check_pointer_bounds.
* gdb.arch/i386-mpx-map.exp: Same.
* gdb.arch/i386-mpx-sigsegv.exp: Same.
* gdb.arch/i386-mpx-simple_segv.exp: Same.
* gdb.arch/i386-mpx.exp: Same.
Tom de Vries [Sat, 2 May 2020 07:50:50 +0000 (09:50 +0200)]
[gdb/testsuite] Update psym-external-decl.exp for gcc-10/clang
When running test-case gdb.base/psym-external-decl.exp with gcc-10, we have:
...
(gdb) print aaa^M
'aaa' has unknown type; cast it to its declared type^M
(gdb) FAIL: gdb.base/psym-external-decl.exp: print aaa
...
With an an earlier version, gcc still emits the debug info for the
declaration of aaa:
...
<0><d2>: Abbrev Number: 1 (DW_TAG_compile_unit)
<d8> DW_AT_name : psym-external-decl.c
<1><f4>: Abbrev Number: 2 (DW_TAG_variable)
<f5> DW_AT_name : aaa
<ff> DW_AT_external : 1
<ff> DW_AT_declaration : 1
...
but with gcc-10 that's no longer the case.
Fix the test-case by adding a use of aaa in psym-external-decl.c.
That still doesn't work for clang, so skip test in that case.
Tested with x86_64-linux, with gcc 7.5.0, gcc 10.0.0 and clang 5.0.2.
Also tested by reverting corresponding fix and ensuring test-case still
fails.
gdb/testsuite/ChangeLog:
2020-05-02 Tom de Vries <tdevries@suse.de>
* gdb.base/psym-external-decl.c (main): Add use of variable aaa.
The first FAIL is because two breakpoint locations are expected, but there are
more than 2:
...
(gdb) break "+"
Breakpoint 2 at 0x402c3c: "+". (6 locations)
(gdb) info break
Num Type Disp Enb Address What
2 breakpoint keep y <MULTIPLE>
2.1 y 0x0000000000402c3c in ops."+"
at operator_bp/ops.adb:25
2.2 y 0x0000000000402e5b in ops."+"
at operator_bp/ops.adb:119
2.3 y 0x0000000000414207 in
system.storage_elements."+" at s-stoele.adb:82
2.4 y 0x0000000000414404 in
system.storage_elements."+" at s-stoele.adb:87
2.5 y 0x0000000000414413 in
system.storage_elements."+" at s-stoele.adb:87
2.6 y 0x0000000000414430 in
system.storage_elements."+" at s-stoele.adb:81
...
This can be traced back to a extra debug info in the executable:
...
$ readelf -w ops_test | grep system__storage_elements__Oadd
<28104> DW_AT_name : system__storage_elements__Oadd__2
<2812e> DW_AT_name : system__storage_elements__Oadd
...
Fix the FAILs by allowing more than the required amount of breakpoint
locations.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2020-05-01 Tom de Vries <tdevries@suse.de>
* gdb.ada/operator_bp.exp: Allow more than required amount of
breakpoint.
Remove gdb-gdb.gdb breakpoint on disappeared function info_command.
The function info_command has disappeared, so this breakpoint does not
work anymore.
"info_command" was a function for the prefix command "info",
giving the list of "info" subcommands.
It is not very clear what the removed breakpoint and its associated
command list was supposed to do.
Removed and pushed as obvious, after discussion with Tom.
Hannes Domani [Fri, 1 May 2020 12:01:02 +0000 (14:01 +0200)]
Fix size recalculation of fortran arrays
My recent change regarding size calculation of arrays of stubbed types
didn't take array strides and associated/allocated type properties into
account, which basically broke fortran arrays.
Fixed by refactoring the array size calculation of
create_array_type_with_stride into a new function, and also use it for
the stubbed array size recalculation.
gdb/ChangeLog:
2020-05-01 Hannes Domani <ssbssa@yahoo.de>
* gdbtypes.c (update_static_array_size): New function.
(create_array_type_with_stride): Use update_static_array_size.
(check_typedef): Likewise.
Tom de Vries [Fri, 1 May 2020 09:04:22 +0000 (11:04 +0200)]
[gdb/testsuite] Fix Wunused-result warning in until-reverse.c
When running test-case gdb.reverse/until-reverse.exp or
gdb.reverse/until-precsave.exp with gcc-10, we run into a Wunused-result
warning:
...
gdb compile failed, gdb.reverse/until-reverse.c: In function 'main':
gdb.reverse/until-reverse.c:40:14: warning: ignoring return value of \
'malloc' declared with attribute 'warn_unused_result' [-Wunused-result]
40 | (void) malloc (1);
| ^~~~~~~~~~
...
Fix this by using the result of malloc as argument to a free call.
Alan Modra [Fri, 1 May 2020 06:02:00 +0000 (15:32 +0930)]
PR25900, RISC-V: null pointer dereference
PR 25900
* elfnn-riscv.c (_bfd_riscv_relax_section): Check root.type before
accessing root.u.def of symbols. Also check root.u.def.section
is non-NULL. Reverse tests so as to make the logic positive.
Alan Modra [Fri, 1 May 2020 06:00:12 +0000 (15:30 +0930)]
objdump: long run time when using -D -z
The zero scan is silly when the result isn't used.
* objdump.c (disassemble_bytes): Don't scan for zeros when
disassembling zeros. Translate "resuming at file offset" message.
Formatting. Replace some signed variables with unsigned.
Alan Modra [Fri, 1 May 2020 05:53:17 +0000 (15:23 +0930)]
PR25882, .gnu.attributes are not checked for shared libraries
This allows backend merge_private_bfd_data to examine shared library
e_flags and/or .gnu.attributes. ARM and PowerPC have done so when
using ld.gold for a long time.
(The tic6x change below is dead code due to the earlier FIXME,
but this is probably one of the changes needed there.)
PR 25882
bfd/
* elf32-tic6x.c (elf32_tic6x_merge_attributes): Don't transfer
Tag_ABI_PIC or Tag_ABI_PID from dynamic objects to the output.
ld/
* ldlang.c (lang_check): Call bfd_merge_private_bfd_data for
shared libraries.
Alan Modra [Fri, 1 May 2020 05:50:14 +0000 (15:20 +0930)]
FIXME for merging of e_flags and .gnu.attributes
Code in the linker, present before the addition of .gnu.attributes
support, results in shared libraries not being considered by BFD when
merging e_flags and .gnu.attributes from input files to the output.
That doesn't seem correct to me, but I don't know enough about all the
various ABIs to change the behaviour with any confidence. So this
patch merely punts on dynamic objects in merge_private_bfd_data target
functions, with a FIXME for maintainer attention.
I haven't excluded shared libraries from being considered where the
target merge_private_bfd_data (a) already has code dealing with shared
libraries, or (b) where that function just sets the output to the most
constraining arch/mach combination and other fairly trivial merges, or
(c) when the target has no shared library linker support.
Hannes Domani [Mon, 27 Apr 2020 11:14:24 +0000 (13:14 +0200)]
Calculate size of array of stubbed type
Sizes of stubbed types are calculated on demand in check_typedef, so the
same must also be done for arrays of stubbed types.
A stubbed type is usually a structure that has only been forward declared,
but can also happen if the structure has a virtual function that's not
inline in the class definition.
For these stubbed types, the size must be recalculated once the full
definition is available.
gdb/ChangeLog:
2020-04-30 Hannes Domani <ssbssa@yahoo.de>
PR gdb/18706
* gdbtypes.c (check_typedef): Calculate size of array of
stubbed type.
gdb/testsuite/ChangeLog:
2020-04-30 Hannes Domani <ssbssa@yahoo.de>
PR gdb/18706
* gdb.cp/stub-array-size.cc: New test.
* gdb.cp/stub-array-size.exp: New file.
* gdb.cp/stub-array-size.h: New test.
* gdb.cp/stub-array-size2.cc: New test.
Alex Coplan [Thu, 30 Apr 2020 14:47:30 +0000 (15:47 +0100)]
AArch64: add GAS support for UDF instruction
binutils * testsuite/binutils-all/aarch64/in-order-all.d: Update to use new
disassembly.
* testsuite/binutils-all/aarch64/out-of-order-all.d: Likewise.
ld/ * testsuite/ld-aarch64/erratum843419_tls_ie.d: Use udf in disassembly.
* testsuite/ld-aarch64/farcall-b-section.d: Likewise.
* testsuite/ld-aarch64/farcall-back.d: Likewise.
* testsuite/ld-aarch64/farcall-bl-section.d: Likewise.
projects / thirdparty / binutils-gdb.git / log
