On Wed, 13 Jun 2001 14:05:51 +0200, Ralf Baechle <ralf@oss.sgi.com> wrote: >On Wed, Jun 13, 2001 at 09:34:18PM +1000, Keith Owens wrote: >> Looks like I need to add a new option to ksymoops. -T <bits>, truncate >> all addresses to this bit size. Added to my list for the next ksymoops >> release. > >That can be done automatically. For 32-bit ELF files mips*-linux binutils >dump some of the addresses as 32-bit addresses, some as sign-extended (!) >64-bit addresses. So ksymops should just sign extend any 32-bit addresses >to 64-bit and then work on full lenght addresses. Some utilities extend with leading 0, some with leading 1, some with special values (alpha). It is safer to truncate everything to the specified width instead of guessing what the extension value is. >Is ksymoops able to handle 64-bit addresses when running on a 32-bit host? >That is a common case for many people when decoding their MIPS oopses. Yes and no. The framework is there to handle 32/64 splits, sparc already uses it. mips does not currently use the framework because the oops report does not identify the machine type 32/64, MSB/LSB. We discussed this in January and I asked for a small change to mips64 oops output (below), was that ever done? ------ From: Keith Owens <kaos@ocs.com.au> To: Ralf Baechle <ralf@uni-koblenz.de> Subject: Re: ksymoops on origin Date: Sat, 06 Jan 2001 18:21:35 +1100 ksymoops is designed to run on any build arch and debug an oops report from any other target arch, as long as binutils supports the target arch. The presence or absence of __MIPSEL__ or __MIPSEB__ on the build system says nothing about the type of the failing target, ksymoops relies on text in the oops report to determine special cases like 32 bit userland and 64 bit kernel. The best option is for a mips64 kernel to indicate that it is 64 bit and its endianess. Instead of printing "epc : %016lx\n" print "epc : %016lx (64 " #ifdef __MIPSEL__ "LSB" #else "MSB" #endif ")\n" If you make that change to arch/mips64/mm/andes.c, arch/mips64/mm/r4xx0.c and any other places that print epc on mips64 then I will change ksymoops to look for (64 [LM]SB) on the epc line and decode accordingly. While we are on the topic of 32 bit userland and 64 bit kernel, how does mips64 handle modules? modutils 2.4.0 has no support for mips64, do you have any code? Also I assume that you will want the same ability as sparc, to compile modutils as a 32 bit program which can handle both 32 and 64 bit modules.
