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[PATCH v3 12/15] gdb: Allow user defined "onload_<modname>" command to b
From: |
Glenn Washburn |
Subject: |
[PATCH v3 12/15] gdb: Allow user defined "onload_<modname>" command to be run when module is loaded |
Date: |
Thu, 15 Dec 2022 01:07:47 -0600 |
When debugging a module it can be desirable to set break points on code
in the module. This is difficult in GRUB because, at GDB start, the
module is not loaded and on EFI platforms its not known ahead of time
where the module will be loaded. So allow users to create an
"onload_<modname>" command which will be run when the module with name
"modname" is loaded.
Create new command "is_user_command" which sets $ret to true value if
the first argument is the name of a user-defined command.
Signed-off-by: Glenn Washburn <development@efficientek.com>
---
grub-core/gdb_grub.in | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/grub-core/gdb_grub.in b/grub-core/gdb_grub.in
index f4243bb718..57152b718f 100644
--- a/grub-core/gdb_grub.in
+++ b/grub-core/gdb_grub.in
@@ -9,6 +9,20 @@
### Lubomir Kundrak <lkudrak@skosi.org>
###
+define is_user_command
+ eval "pipe help user-defined | grep -q '%s'", $arg0
+ set $ret = ! $_shell_exitcode
+end
+document is_user_command
+ Set $ret to true value if first argument is the name of a user-defined
+ command.
+end
+
+define is_onload_command
+ eval "set $is_onload_command_name = \"onload_%s\"", $arg0
+ is_user_command $is_onload_command_name
+end
+
define dynamic_load_kernel_exec_symbols
shell rm -f .remove-kernel.exec.symfile.gdb
shell sh gdb_helper.sh gen_kernel_exec_loadsym $arg0
>.kernel.exec.loadsym.gdb
@@ -76,8 +90,18 @@ end
###
define load_module
+ set $load_module_onload_cmd = ""
+ is_onload_command $arg0->name
+ if $ret
+ eval "set $load_module_onload_cmd = \"onload_%s
(grub_dl_t)%p\"", $arg0->name, $arg0
+ end
+
dump_module_sections $arg0
match_and_load_symbols
+
+ if ! $_streq($load_module_onload_cmd, "")
+ eval "%s", $load_module_onload_cmd
+ end
end
document load_module
Load debugging information for module given as argument.
--
2.34.1
- [PATCH v3 02/15] gdb: Prevent wrapping when writing to .segments.tmp, (continued)
- [PATCH v3 02/15] gdb: Prevent wrapping when writing to .segments.tmp, Glenn Washburn, 2022/12/15
- [PATCH v3 03/15] gdb: If no modules have been loaded, do not try to load module symbols, Glenn Washburn, 2022/12/15
- [PATCH v3 04/15] gdb: Move runtime module loading into runtime_load_module, Glenn Washburn, 2022/12/15
- [PATCH v3 05/15] gdb: Get correct mod variable value, Glenn Washburn, 2022/12/15
- [PATCH v3 06/15] gdb: Do not run load_module if module has already been loaded, Glenn Washburn, 2022/12/15
- [PATCH v3 07/15] gdb: Add functions to make loading from dynamically positioned targets easier, Glenn Washburn, 2022/12/15
- [PATCH v3 08/15] gdb: Remove Perl dependency for GRUB GDB script, Glenn Washburn, 2022/12/15
- [PATCH v3 09/15] gdb: If enabled, print line used to load EFI kernel symbols when using gdb_grub script, Glenn Washburn, 2022/12/15
- [PATCH v3 10/15] gdb: Conditionally run GDB script logic for dynamically or statically positioned GRUB, Glenn Washburn, 2022/12/15
- [PATCH v3 11/15] gdb: Only connect to remote target once when first sourced, Glenn Washburn, 2022/12/15
- [PATCH v3 12/15] gdb: Allow user defined "onload_<modname>" command to be run when module is loaded,
Glenn Washburn <=
- [PATCH v3 13/15] gdb: Allow running user-defined commands at GRUB start, Glenn Washburn, 2022/12/15
- [PATCH v3 14/15] gdb: Add ability to turn on shell tracing for gdb helper script, Glenn Washburn, 2022/12/15
- [PATCH v3 15/15] docs: Add debugging chapter to development documentation, Glenn Washburn, 2022/12/15