From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 12408 invoked by alias); 16 Nov 2015 10:57:42 -0000 Mailing-List: contact ecos-discuss-help@ecos.sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: ecos-discuss-owner@ecos.sourceware.org Received: (qmail 11434 invoked by uid 89); 16 Nov 2015 10:57:41 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=0.1 required=5.0 tests=AWL,BAYES_00,FREEMAIL_FROM,RCVD_IN_DNSWL_LOW,SPF_PASS autolearn=ham version=3.3.2 X-HELO: mail-io0-f194.google.com Received: from mail-io0-f194.google.com (HELO mail-io0-f194.google.com) (209.85.223.194) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES128-GCM-SHA256 encrypted) ESMTPS; Mon, 16 Nov 2015 10:57:40 +0000 Received: by ioc74 with SMTP id 74so16423468ioc.2 for ; Mon, 16 Nov 2015 02:57:38 -0800 (PST) MIME-Version: 1.0 X-Received: by 10.107.155.78 with SMTP id d75mr22917798ioe.94.1447671458657; Mon, 16 Nov 2015 02:57:38 -0800 (PST) Received: by 10.36.146.70 with HTTP; Mon, 16 Nov 2015 02:57:38 -0800 (PST) Date: Mon, 16 Nov 2015 10:57:00 -0000 Message-ID: From: Robert H To: ecos-discuss@ecos.sourceware.org Content-Type: text/plain; charset=UTF-8 X-IsSubscribed: yes Subject: [ECOS] ecos hal symbol table creation mechanism X-SW-Source: 2015-11/txt/msg00000.txt.bz2 Hello all, I have some questions concerning the ecos hal symbol table creation in hal_tables.h How is it possible to export a symbol which is in the ecos image into some object file for it being able to call it? I know that test_mods.c uses some defines the object file - that the application programer wants to load - uses some defines: e.g. CYG_LDR_TABLE_ENTRY(cyg_alarm_create_entry,"cyg_alarm_create",cyg_alarm_create); which then gets replaced by cyg_ldr_table_entry __name CYG_HAL_TABLE_ENTRY(ldr_table) = { __symbol_name, __handler }; // line 141 in objelf.h // with __name being a struct of // { char *__symbol_name , void *__handler }; // where is the definition of ldr_table? I can't seem to find it anywhere and then again gets replaced by cyg_ldr_table_entry __name __attribute__((section(".ecos.table.ldr_table.data")) = { __symbol_name , __handler }; // line 103 in hal_tables.h Does the section attribute here tell the compiler to put a struct cyg_ldr_tables_entry entry (in this example: {"cyg_alarm_create" , cyg_alarm_create} ) into the ecos image's section .ecos.table.ldr_table.data? Then again, I wonder then how the ecos is able to get the adress of the function/symbol cyg_alarm_create into the handler cyg_alarm_create. I would be very pleased to know more about how the mechanism to get ecos symbols works in hal_tables.h Thanks, Robert H. -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss