* Dave Johnson <firstname.lastname@example.org> [2005-08-22 17:08]:
> I've been trying to fix core file support for 64bit kernel with o32
> userspace (working against 2.6.12 cvs tag).
> After applying the patch posted on 13 Feb 2005 from Daniel Jacobowitz
> to fix binfmt_elfo32.c (any reason this didn't make it into CVS?),
> I still ran into trouble with gdb not understanding the NT_PRSTATUS
> header in the core file.
> While Dan's fix makes the kernel use elf32 definitions, gdb was still
> getting confused by pr_reg contained in the core file.
> Dan's definition of ELF_CORE_COPY_REGS in binfmt_elfo32.c is copying
> the registers using EF_R0 as 0 not 6 producing results into offset 0
> through 37 not 6 through 43 as gdb expects for 32bit core files.
> Below patch (applied after Dan's patch) writes the registers at offset
> 6 making gdb much happier.
* Daniel Jacobowitz <email@example.com> [2005-08-28 11:45]:
> > Below patch (applied after Dan's patch) writes the registers at offset
> > 6 making gdb much happier.
> FYI, this has all been rearranged since - it did this correctly at the
> time. I don't know why the patch was dropped.
Can this be applied?
> Fix o32 core files under 64bit kernel to use correct register
> offset in NT_PRSTATUS
> Signed-off-by: Dave Johnson <firstname.lastname@example.org>
> ===== arch/mips/kernel/binfmt_elfo32.c 1.7 vs edited =====
> --- 1.7/arch/mips/kernel/binfmt_elfo32.c 2005-08-20 12:30:12 -04:00
> +++ edited/arch/mips/kernel/binfmt_elfo32.c 2005-08-22 16:09:59 -04:00
> @@ -51,6 +51,7 @@
> #define TASK32_SIZE 0x7fff8000UL
> #undef ELF_ET_DYN_BASE
> #define ELF_ET_DYN_BASE (TASK32_SIZE / 3 * 2)
> +#define WANT_COMPAT_REG_H
> #include <asm/processor.h>
> #include <linux/module.h>
> ===== include/asm-mips/reg.h 1.1 vs edited =====
> --- 1.1/include/asm-mips/reg.h 2005-02-02 11:39:14 -05:00
> +++ edited/include/asm-mips/reg.h 2005-08-22 15:55:04 -04:00
> @@ -70,7 +70,7 @@
> -#if CONFIG_MIPS64
> +#if defined(CONFIG_MIPS64) && !defined(WANT_COMPAT_REG_H)
> #define EF_R0 0
> #define EF_R1 1