public inbox for gdb-prs@sourceware.org
help / color / mirror / Atom feed
* [Bug gdb/29930] New: disassemble does not show symbol name sometimes
@ 2022-12-21 22:18 development at efficientek dot com
2023-02-10 18:44 ` [Bug gdb/29930] " tromey at sourceware dot org
0 siblings, 1 reply; 2+ messages in thread
From: development at efficientek dot com @ 2022-12-21 22:18 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=29930
Bug ID: 29930
Summary: disassemble does not show symbol name sometimes
Product: gdb
Version: 12.1
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gdb
Assignee: unassigned at sourceware dot org
Reporter: development at efficientek dot com
Target Milestone: ---
Here is the output of disassemble that shows this issue:
(gdb) disassemble
Dump of assembler code for function grub_cmd_read:
0x000000007bec6720 <+0>: push %r15
0x000000007bec6722 <+2>: push %r14
0x000000007bec6724 <+4>: push %r13
0x000000007bec6726 <+6>: push %r12
0x000000007bec6728 <+8>: mov %esi,%r12d
0x000000007bec672b <+11>: push %rbp
0x000000007bec672c <+12>: push %rbx
0x000000007bec672d <+13>: sub $0x18,%rsp
0x000000007bec6731 <+17>: mov 0x8(%rdi),%rax
=> 0x000000007bec6735 <+21>: mov $0x5,%edi
0x000000007bec673a <+26>: mov %rdx,0x8(%rsp)
0x000000007bec673f <+31>: mov (%rax),%r14d
0x000000007bec6742 <+34>: movabs $0x7da81596,%rax
0x000000007bec674c <+44>: call *%rax
0x000000007bec674e <+46>: test %rax,%rax
0x000000007bec6751 <+49>: je 0x7bec67f7 <grub_cmd_read+215>
0x000000007bec6757 <+55>: movabs $0x7da87eff,%r15
0x000000007bec6761 <+65>: mov %rax,%rbp
...
(gdb) info symbol 0x7da81596
grub_malloc in section .text of
/home/grub-tester/bootloader/build/obj-x86_64-efi/grub-core/kernel.exec
We can see here that gdb knows of symbol grub_malloc at 0x7da81596, however, in
the disassembly at the second line below the one starting with '=>', the value
$0x7da81596 is not substituted for "grub_malloc".
Perhaps this can be turned on by setting special flags to the disassembler, but
I've not encountered any. Nor have I seen any gdb settings that might turn this
on.
I believe this happens for all literals that are in instructions that do not
potentially change the instruction pointer, like movabs, whereas instructions
that do, like je, have the symbol.
--
You are receiving this mail because:
You are on the CC list for the bug.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug gdb/29930] disassemble does not show symbol name sometimes
2022-12-21 22:18 [Bug gdb/29930] New: disassemble does not show symbol name sometimes development at efficientek dot com
@ 2023-02-10 18:44 ` tromey at sourceware dot org
0 siblings, 0 replies; 2+ messages in thread
From: tromey at sourceware dot org @ 2023-02-10 18:44 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=29930
Tom Tromey <tromey at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tromey at sourceware dot org
Ever confirmed|0 |1
Last reconfirmed| |2023-02-10
Status|UNCONFIRMED |NEW
--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
Offhand I don't know whether this is a bug in gdb or in libopcodes.
--
You are receiving this mail because:
You are on the CC list for the bug.
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2023-02-10 18:44 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-12-21 22:18 [Bug gdb/29930] New: disassemble does not show symbol name sometimes development at efficientek dot com
2023-02-10 18:44 ` [Bug gdb/29930] " tromey at sourceware dot org
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).