From mboxrd@z Thu Jan 1 00:00:00 1970 Received: (from majordomo@localhost) by oss.sgi.com (8.11.2/8.11.3) id fA115Hh25884 for linux-mips-outgoing; Wed, 31 Oct 2001 17:05:17 -0800 Received: from smtp.huawei.com ([61.144.161.21]) by oss.sgi.com (8.11.2/8.11.3) with SMTP id fA1157025874; Wed, 31 Oct 2001 17:05:08 -0800 Received: from hcdong11752a ([10.105.30.0]) by smtp.huawei.com (Netscape Messaging Server 4.15) with SMTP id GM3K8M00.E62; Thu, 1 Nov 2001 09:02:46 +0800 Message-ID: <000f01c16271$8013eae0$001e690a@huawei.com> From: "machael" To: Cc: "Ralf Baechle" Subject: KSEG0 and KSEG2 ... Date: Thu, 1 Nov 2001 09:06:55 +0800 MIME-Version: 1.0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200 Sender: owner-linux-mips@oss.sgi.com Precedence: bulk Hello,ralf: I use linux-2.4.5 and have some questions to need your help. I try to replace some kernel functions with my own implementations.I will explain it in the following: Let's say: void (*my_func)(void)=func1; where "my_func" is a function pointer defined in kernel, and "func1" is a function(void func1(void)) implemented in kernel.And "my_func" is an EXPORTED SYMBOL in mips_ksyms.c. Now I want to replace "func1" with my own "func2" in a module my_module.o: extern void (*my_func)(void); my_func = func2; where "func2" is a function (void fun2(void)) implemented in "my_module.o". If I do "insmod my_module.o", the kernel should run OK. In fact, it is often met an "unhandled kernel unaligned access" or "do_page_fault" exception and then panics. We know "func1" should be in KSEG0(unmapped , cached) since it is implemented in kernel space.So it's address should be 0x8XXXXXXX.And "my_func" should also pointed to this same address before inserting my_module.o. And "func2" should be in KSEG2(mapped, cached) since it is implemented in module, So it's address should be 0xCXXXXXXX.After inserting my_module.o, "my_func" should be changed to pointed to this new address in KSEG2. My question is : When "my_func" changes from KSEG0 from KSEG2, Can it cause some problems? Thank you very much. machael From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <000f01c16271$8013eae0$001e690a@huawei.com> From: "machael" Subject: KSEG0 and KSEG2 ... Date: Thu, 1 Nov 2001 09:06:55 +0800 MIME-Version: 1.0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: 7bit Sender: owner-linux-mips@oss.sgi.com To: linux-mips@oss.sgi.com Cc: Ralf Baechle Message-ID: <20011101010655.3Xv1gZ690sZr7dWS5JCNwrM0xuLNwAmdzcKXGco0LIY@z> Hello,ralf: I use linux-2.4.5 and have some questions to need your help. I try to replace some kernel functions with my own implementations.I will explain it in the following: Let's say: void (*my_func)(void)=func1; where "my_func" is a function pointer defined in kernel, and "func1" is a function(void func1(void)) implemented in kernel.And "my_func" is an EXPORTED SYMBOL in mips_ksyms.c. Now I want to replace "func1" with my own "func2" in a module my_module.o: extern void (*my_func)(void); my_func = func2; where "func2" is a function (void fun2(void)) implemented in "my_module.o". If I do "insmod my_module.o", the kernel should run OK. In fact, it is often met an "unhandled kernel unaligned access" or "do_page_fault" exception and then panics. We know "func1" should be in KSEG0(unmapped , cached) since it is implemented in kernel space.So it's address should be 0x8XXXXXXX.And "my_func" should also pointed to this same address before inserting my_module.o. And "func2" should be in KSEG2(mapped, cached) since it is implemented in module, So it's address should be 0xCXXXXXXX.After inserting my_module.o, "my_func" should be changed to pointed to this new address in KSEG2. My question is : When "my_func" changes from KSEG0 from KSEG2, Can it cause some problems? Thank you very much. machael