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author | Bruno Larsen <blarsen@redhat.com> | 2022-11-03 10:17:36 +0100 |
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committer | Bruno Larsen <blarsen@redhat.com> | 2023-01-04 11:21:57 +0100 |
commit | e24d337e219da287535eddc5c9918ac410d124be (patch) | |
tree | b13e90469ebd1690ffeb755eb1ccaab6471d2a60 /gdb/doc | |
parent | 502c7218da3c486e58d6ce039b36fb4fa62d3a92 (diff) | |
download | gdb-e24d337e219da287535eddc5c9918ac410d124be.zip gdb-e24d337e219da287535eddc5c9918ac410d124be.tar.gz gdb-e24d337e219da287535eddc5c9918ac410d124be.tar.bz2 |
gdb: add 'maintenance print record-instruction' command
While chasing some reverse debugging bugs, I found myself wondering what
was recorded by GDB to undo and redo a certain instruction. This commit
implements a simple way of printing that information.
If there isn't enough history to print the desired instruction (such as
when the user hasn't started recording yet or when they request 2
instructions back but only 1 was recorded), GDB warns the user like so:
(gdb) maint print record-instruction
Not enough recorded history
If there is enough, GDB prints the instruction like so:
(gdb) maint print record-instruction
4 bytes of memory at address 0x00007fffffffd5dc changed from: 01 00 00 00
Register eflags changed: [ IF ]
Register rip changed: (void (*)()) 0x401115 <main+15>
Approved-by: Eli Zaretskii <eliz@gnu.org>
Reviewed-by: Alexandra Hajkova <ahajkova@redhat.com>
Reviewed-by: Lancelot Six <lsix@lancelotsix.com>
Approved-by: Tom Tromey <tom@tromey.com>
Diffstat (limited to 'gdb/doc')
-rw-r--r-- | gdb/doc/gdb.texinfo | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo index ea54f25..dd8f8bc 100644 --- a/gdb/doc/gdb.texinfo +++ b/gdb/doc/gdb.texinfo @@ -40542,6 +40542,14 @@ that symbol is described. The type chain produced by this command is a recursive definition of the data type as stored in @value{GDBN}'s data structures, including its flags and contained types. +@kindex maint print record-instruction +@item maint print record-instruction +@itemx maint print record-instruction @var{N} +print how GDB recorded a given instruction. If @var{n} is not positive +number, it prints the values stored by the inferior before the @var{n}-th previous +instruction was exectued. If @var{n} is positive, print the values after the @var{n}-th +following instruction is executed. If @var{n} is not given, 0 is assumed. + @kindex maint selftest @cindex self tests @item maint selftest @r{[}-verbose@r{]} @r{[}@var{filter}@r{]} |