Re: [Detaolb-devel] [Qemu-devel] ANN: DetaolB v0.4 is released
On 7/11/07, Blue Swirl [EMAIL PROTECTED] wrote: It's entirely possibly that qemu and real sparc hardware are behaving differently, but I'm not seeing this bus error under qemu. (I haven't got real sparc hardware, so I can only debug against qemu...) Right. Debugging the problem I found out that in Qemu, 64-bit loads and stores to unaligned addresses do not trigger any traps as they should. I'll commit a fix soon. The problem is in uClibc ldso, there is this kind of store. Running the program on qemu-sparc reveals another problem, probably because of these definitions in ldso/ldso/sparc/dl-sysdep.h: /* 4096 bytes alignment */ /* ...but 8192 is required for mmap() on sparc64 kernel */ #define PAGE_ALIGN 0xe000 #define ADDR_ALIGN 0x1fff #define OFFS_ALIGN 0x7fffe000 On Sparc32 the correct page alignment is still 4096. Because of these definitions, some code apparently tries to clear a 8k page, but only 4k of memory is mapped. I just managed a compilation of bash-3.2 using ncurses-5.6 and uClibc-0.9.29 inside a qemu-system-sparc (native compilation, no cross compilation). ldd ./bash points naturally to libdl.so.0, libc.so.0, ld-uClibc.so.0 ./bash Segmentation fault I do not have gdb compiled yet... I'll check soon with busybox ash, since I recompiled uClibc with the sched_affinity patch. -- Christian -- http://detaolb.sourceforge.net/, a linux distribution for Qemu
Re: [Detaolb-devel] [Qemu-devel] ANN: DetaolB v0.4 is released
On 7/11/07, Christian MICHON [EMAIL PROTECTED] wrote: I just managed a compilation of bash-3.2 using ncurses-5.6 and uClibc-0.9.29 inside a qemu-system-sparc (native compilation, no cross compilation). ldd ./bash points naturally to libdl.so.0, libc.so.0, ld-uClibc.so.0 ./bash Segmentation fault I do not have gdb compiled yet... I'll check soon with busybox ash, since I recompiled uClibc with the sched_affinity patch. busybox-1.6.0 does segfault here too. I had to remove taskset as apparently the sched_affinity patch did not fix the linking step. is there a repository of sparc/uclibc patches somewhere ? Blue mentionned he'll have a fix for uclibc ldso. I'll try it using this dev environment as soon as it'll be out. -- Christian -- http://detaolb.sourceforge.net/, a linux distribution for Qemu
Re: [Detaolb-devel] [Qemu-devel] ANN: DetaolB v0.4 is released
On Wednesday 11 July 2007 9:34:17 am Christian MICHON wrote: I just managed a compilation of bash-3.2 using ncurses-5.6 and uClibc-0.9.29 inside a qemu-system-sparc (native compilation, no cross compilation). ldd ./bash points naturally to libdl.so.0, libc.so.0, ld-uClibc.so.0 ./bash Segmentation fault When you get that kind of segmentation fault, see if hello world segfaults too. (In general, when building with a new toolchain, new C library, new kernel, new root filesystem packaging method, or a new system in general, if anything goes wrong back up a few steps and make sure hello world works before trying to debug anything fancier.) I do not have gdb compiled yet... I'll check soon with busybox ash, since I recompiled uClibc with the sched_affinity patch. Rob -- One of my most productive days was throwing away 1000 lines of code. - Ken Thompson.
Re: [Detaolb-devel] [Qemu-devel] ANN: DetaolB v0.4 is released
On 7/11/07, Rob Landley [EMAIL PROTECTED] wrote: When you get that kind of segmentation fault, see if hello world segfaults too. (In general, when building with a new toolchain, new C library, new kernel, new root filesystem packaging method, or a new system in general, if anything goes wrong back up a few steps and make sure hello world works before trying to debug anything fancier.) I was not clear then. I've binutils already compiled versus uClibc for sparc, and it works. Some of those binaries from binutils are bigger than the expected size of final uclibc dynamic busybox. of course, as soon as I got uclibc compiled, hello world comes first to my mind, and it was working. -- Christian -- http://detaolb.sourceforge.net/, a linux distribution for Qemu
Re: [Detaolb-devel] [Qemu-devel] ANN: DetaolB v0.4 is released
On 7/11/07, Rob Landley [EMAIL PROTECTED] wrote: I look forward to a fix. It would be nice to add sparc to the actually works list. :) that's 2 persons looking forward to it. ;-) today's results: - uclibc ok (minus the segfaults coming from it) - conf from busybox segfaults - bash segfaults - busybox segfaults - gcc does not build without bash (I'll replace with ash tomorrow) - binutils ok - ncurses ok (I need to look at uclibc' conf now) - make ok - bzip2 ok - coreutils ok - findutils ok Blue swirl, please note that the porting of DetaolB to sparc32 will take more time than scheduled, once the segfault issues are covered. I'd like to spend some time testing firmware and cross compilation :) -- Christian -- http://detaolb.sourceforge.net/, a linux distribution for Qemu
