On Thu, Nov 08, 2007 at 02:03:22PM -0800, Andrew Sharp wrote:
> The gdb from debian etch (6.4.90-debian) doesn't like core files
> produced by 64-bit kernel it seems. I've got this patch which seems
> to do the job, but I'm unclear on what other implications it might have,
> if any.
> diff --git a/arch/mips/kernel/binfmt_elfo32.c b/arch/mips/kernel/binfmt_elfo32.c
> index 993f7ec..58533dc 100644
> --- a/arch/mips/kernel/binfmt_elfo32.c
> +++ b/arch/mips/kernel/binfmt_elfo32.c
> @@ -54,9 +54,13 @@ typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
>
> #include <asm/processor.h>
> #include <linux/module.h>
> -#include <linux/elfcore.h>
> #include <linux/compat.h>
>
> +void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs);
> +#undef ELF_CORE_COPY_REGS
> +#define ELF_CORE_COPY_REGS(_dest,_regs) elf32_core_copy_regs(_dest,_regs);
> +#include <linux/elfcore.h>
> +
> #define elf_prstatus elf_prstatus32
> struct elf_prstatus32
> {
> @@ -109,9 +113,6 @@ jiffies_to_compat_timeval(unsigned long jiffies, struct comp
> value->tv_usec = rem / NSEC_PER_USEC;
> }
>
> -#undef ELF_CORE_COPY_REGS
> -#define ELF_CORE_COPY_REGS(_dest,_regs) elf32_core_copy_regs(_dest,_regs);
> -
> void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)
> {
> int i;
Looks like it's a larger change than needed.
> diff --git a/include/asm-mips/reg.h b/include/asm-mips/reg.h
> index 634b55d..b44b308 100644
> --- a/include/asm-mips/reg.h
> +++ b/include/asm-mips/reg.h
> @@ -12,7 +12,7 @@
> #ifndef __ASM_MIPS_REG_H
> #define __ASM_MIPS_REG_H
>
> -
> +#define WANT_COMPAT_REG_H
> #if defined(CONFIG_32BIT) || defined(WANT_COMPAT_REG_H)
>
> #define EF_R0 6
> @@ -69,7 +69,7 @@
>
> #endif
>
> -#ifdef CONFIG_64BIT
> +#if defined(CONFIG_64BIT) && !defined(WANT_COMPAT_REG_H)
>
> #define EF_R0 0
> #define EF_R1 1
This change breaks the native 64-bit and N32 ptrace and core dumpers.
I suggest something more minimal like the below patch. Does that one do
the trick for you?
Ralf
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
arch/mips/kernel/ptrace32.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/arch/mips/kernel/ptrace32.c b/arch/mips/kernel/ptrace32.c
index 76818be..44109fb 100644
--- a/arch/mips/kernel/ptrace32.c
+++ b/arch/mips/kernel/ptrace32.c
@@ -14,6 +14,9 @@
* At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit
* binaries.
*/
+
+#define WANT_COMPAT_REG_H
+
#include <linux/compiler.h>
#include <linux/kernel.h>
#include <linux/sched.h>
