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Full Discussion: Search the symbol table of a child process
Top Forums Programming Search the symbol table of a child process Post 303034403 by alphakili on Wednesday 24th of April 2019 05:56:20 PM
Old 04-24-2019
Well, essentially I wanted to expand my debugger for AmigaOS to work on other platforms. I could do just a libgdb wrapper, but I thought it would be more interesting to do it manually and figure out, how these things work on other OS'es. Which means mainly linux at the time.

Obviously I got stuck just trying to find the address of a simple symbol. I came across this: GitHub - TartanLlama/minidbg: A mini x86 linux debugger for teaching purposes But he has the same problem: There is no symbol relocation done, so he doesn't know the actual placement of the symbols in the executable.

I am going to look into if shared memory of the /proc handler can help me. If not, I am probably going to do some libgdb wrapper for my app and focus on getting that to work and other platforms.
 

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LEARN ABOUT HPUX

vparreloc

vparreloc(1M)															     vparreloc(1M)

NAME

       vparreloc  -  relocate  the  load address of a vmunix file, determine if a vmunix file is relocatable, or promote the scope of symbols in a
       relocatable vmunix file

SYNOPSIS

       target-load-address source-vmunix-file target-vmunix-file]

       global-symbol-vmunix-file source-vmunix-file target-vmunix-file]

       symbol-name source-vmunix-file target-vmunix-file]

       source-vmunix-file

DESCRIPTION

       There are four forms of this command.  Each form requests that one of four supported operations be performed.  The four forms  are  distin-
       guished based on whether they contain a or none of these options.

       If  the fourth form of the command is used, then the source file is checked to determine if it is relocatable.  The remaining three command
       forms are described below.

       The command is allowed on Itanium(R)-based platforms for compatibility.	No action is taken for this command.

   Options
       recognizes the following command-line options:

       Specifies that kernel relocation is requested.
		 The source file is relocated to the load address specified in the target load address option, and the result is  written  to  the
		 target file.  This option needs to be used when kernel relocation is required.

       The file specified by this option is the source
		 file for the requested operation.  The requested operation will be performed on this file, and the result will be placed into the
		 target file.  This is a required option for all four forms of this command.

       Specifies that global symbol promotion has been requested on a single symbol.
		 The symbol matching the symbol name specified is promoted to global scope, and the resulting file is written to the target  file.
		 Note that only one option may be specified.  All subsequent attempts to use this option will be ignored.

		 This  option  is  useful  when  a very small number of symbols need to be promoted to global scope.  There is no need to create a
		 global symbol file for this option.

       Specifies that global symbol promotion has been requested.
		 All symbols in the source file which match a symbol with global scope in the global symbol  file  are	promoted  to  have  global
		 scope.  The result is written to the target file.

		 The global symbol file can be created in one of two ways: it should either be a non-relocatable file, or a relocatable file which
		 has already been run through vparreloc using the option.

		 This option is useful when a tool expects certain symbols to be of global scope.  The	creation  of  a  relocatable  kernel  file
		 changes the scope of all symbols in that file to be local.

       Suppress the most common messages.
		 Note  that error messages regarding an invalid file will still be printed.  This option is only available with the fourth form of
		 this command.

		 This option is useful when used in a script which examines the return value of this command, and has no  need	for  the  informa-
		 tional messages.

       The result of the requested operation will be placed into the target
		 file.	 The first three forms of this command utilize the target file option.	If no target file option is specified, the default
		 becomes If the fourth form specifies a target file option, it will be ignored.

       Note that the and options cannot be combined in a single invocation of the command.

EXAMPLES

       To determine if a file is relocatable:

       To relocate a file to be loaded at address 0x04000000, and place the resulting file into

       To promote all symbols that should have global scope in a file that has been linked utilizing the kernel relocation options:

RETURN VALUE

       The command exits with one of the following values:

	      Successful completion.
	      Bad options.
	      Can not open a file.
	      Error reading from or writing to a file, or allocating memory.
	      Invalid
		   kernel file.
	      File is not relocatable.

AUTHOR

       was developed by the Hewlett-Packard Company.

SEE ALSO

       vparextract(1M).

																     vparreloc(1M)
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