elf: add ELF_CORE_COPY_KERNEL_REGS()

ELF core dump is used for both user land core dump and kernel crash
dump.  Depending on architecture, register might need to be accessed
differently for userland and kernel.  Allow architectures to define
ELF_CORE_COPY_KERNEL_REGS() and use different operation for kernel
register dump.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/include/linux/elfcore.h b/include/linux/elfcore.h
index 5ca54d77079f1dd14b713d54e5f4566f01da59dd..7605c5e9589f4cc9d08c4aca7ccebd3f707fb710 100644 (file)
--- a/include/linux/elfcore.h
+++ b/include/linux/elfcore.h
@@ -111,6 +111,15 @@ static inline void elf_core_copy_regs(elf_gregset_t *elfregs, struct pt_regs *re
 #endif
 }
 
+static inline void elf_core_copy_kernel_regs(elf_gregset_t *elfregs, struct pt_regs *regs)
+{
+#ifdef ELF_CORE_COPY_KERNEL_REGS
+       ELF_CORE_COPY_KERNEL_REGS((*elfregs), regs);
+#else
+       elf_core_copy_regs(elfregs, regs);
+#endif
+}
+
 static inline int elf_core_copy_task_regs(struct task_struct *t, elf_gregset_t* elfregs)
 {
 #ifdef ELF_CORE_COPY_TASK_REGS

diff --git a/kernel/kexec.c b/kernel/kexec.c
index 8a6d7b08864ea199108cae686adbe1a8886a56a5..795e7b67a2282d774a393bc93888539c775fc1cb 100644 (file)
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1130,7 +1130,7 @@ void crash_save_cpu(struct pt_regs *regs, int cpu)
                return;
        memset(&prstatus, 0, sizeof(prstatus));
        prstatus.pr_pid = current->pid;
-       elf_core_copy_regs(&prstatus.pr_reg, regs);
+       elf_core_copy_kernel_regs(&prstatus.pr_reg, regs);
        buf = append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS,
                              &prstatus, sizeof(prstatus));
        final_note(buf);