Andrew,
I found EmulatorPkg is using <Module>.dll as the debug symbol by sourcing
Build/Emulator/DEBUG_GCC46/X64/Host.gdb as the GDB script. Actually
<Module>.debug should be used. Because Conf/build_rule.txt strips the debug
information out of the <ModuleName>.dll and creates a separate debug symbol
file <Module>.debug to store all the .debug_xxx sections.
So I think we may need to change the EmulatorPkg/Unix/Host/Host.c to generate
the correct Host.gdb by using <Module>.debug.
Another issue I observed only happens in Fedora. Even I changed Host.c to use
<Module>.debug as the symbol file. I still find the output of GDB "bt" command
cannot display the parameter value correctly. The output of GDB looks like this:
...
#17 0x0000000044f616a8 in PlatformBdsEnterFrontPage (TimeoutDefault=can't
compute CFA for this frame)
At /home/ray/work/edk2/IntelFrameworkModulePkg/Universal/BdsDxe/FrontPage.c:1117
#18 0x0000000043d786da in PlatformBdsPolicyBehavior (DriverOptionList=can't
compute CFA for this frame)
At
/home/ray/work/edk2/IntelFrameworkModulePkg/Universal/BdsDxe/BdsPlatform.c:413
...
I found it's due to the missing of .eh_frame section which is removed by ld
because of the --gc-sections flag. If I remove the --gc-sections flag and
modify the Conf/build_rule.txt to keep .eh_frame section, the issue was gone.
<Command.GCC>
$(OBJCOPY) -only-keep-debug $(src) $(DEBUG_DIR)(+)$(MODULE_NAME).debug
$(OBJCOPY) --strip-unneeded $(src)
to
<Command.GCC>
$(CP) ${src} $(DEBUG_DIR)(+)$(MODULE_NAME).debug
$(OBJCOPY) --strip-unneeded $(src)
But I don't think what the root cause is. Do you have any suggestion on this?
Regards,
Ray
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