Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 18 Mar 2002 16:45:36 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 18 Mar 2002 16:45:22 -0500 Received: from hq.fsmlabs.com ([209.155.42.197]:26887 "EHLO hq.fsmlabs.com") by vger.kernel.org with ESMTP id ; Mon, 18 Mar 2002 16:45:08 -0500 From: Cort Dougan Date: Mon, 18 Mar 2002 14:43:32 -0700 To: linux-kernel@vger.kernel.org Subject: Print symbolic address of kernel and modules without extra data Message-ID: <20020318144332.F4783@host110.fsmlabs.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org I just added this to the PPC debugger and the strongARM panic code when I realized that I'm going to have to add this to MIPS, too. Rather than that, I'll send it here with the hope that someone finds it useful. Consider this my contribution at the kernel-debugger and other dangerous technologies altar. Given an address, it prints out the symbolic name for it by digging through the module symbol table rather than stuffing gobs of system.map data into the kernel image. It'll only pick up on EXPORT_SYMBOL() symbols but it's a lot better than having to figure out what has happened in a module that I've loaded on an embedded board with now r/w filesystem. #if defined(CONFIG_MODULES) #include static void lookup_print_addr(unsigned long addr) { extern unsigned long *_end; unsigned long best_match = 0; /* so far */ char best_match_string[60] = {0, }; /* so far */ #if defined(CONFIG_MODULES) struct module *mod; struct module_symbol *sym; int j; #endif /* user addresses - just print user and return -- Cort */ if ( addr < PAGE_OFFSET ) { printk("(user)"); return; } for (mod = module_list; mod; mod = mod->next) { for ( j = 0, sym = mod->syms; j < mod->nsyms; ++j, ++sym) { /* is this a better match than what we've * found so far? -- Cort */ if ( (sym->value < addr) && ((addr - sym->value) < (addr - best_match)) ) { best_match = sym->value; /* kernelmodule.name is "" so we * have a special case -- Cort */ if ( mod->name[0] == 0 ) sprintf(best_match_string, "%s", sym->name); else sprintf(best_match_string, "%s:%s", sym->name, mod->name); } } } if ( best_match ) printk("(%s + 0x%x)", best_match_string, addr - best_match); else printk("(???)"); } #endif /* CONFIG_MODULES */ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/