x86: kdump failure

kdump needs ELF_CORE_COPY_REGS in crash_save_cpu().
This lack of the macro causes the following BUG.

 SysRq : Trigger a crashdump
 ------------[ cut here ]------------
 kernel BUG at include/linux/elfcore.h:105!
 invalid opcode: 0000 [1] PREEMPT SMP

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 62 insertions, 0 deletions

diff --git a/include/asm-x86/elf.h b/include/asm-x86/elf.h
index dab4744f9586..d9c94e707289 100644
--- a/include/asm-x86/elf.h
+++ b/include/asm-x86/elf.h
@@ -106,6 +106,31 @@ extern unsigned int vdso_enabled;
         _r->ax = 0; \
 } while (0)
 
+/*
+ * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
+ * now struct_user_regs, they are different)
+ */
+
+#define ELF_CORE_COPY_REGS(pr_reg, regs) do {           \
+        pr_reg[0] = regs->bx;                           \
+        pr_reg[1] = regs->cx;                           \
+        pr_reg[2] = regs->dx;                           \
+        pr_reg[3] = regs->si;                           \
+        pr_reg[4] = regs->di;                           \
+        pr_reg[5] = regs->bp;                           \
+        pr_reg[6] = regs->ax;                           \
+        pr_reg[7] = regs->ds & 0xffff;                  \
+        pr_reg[8] = regs->es & 0xffff;                  \
+        pr_reg[9] = regs->fs & 0xffff;                  \
+        savesegment(gs, pr_reg[10]);                    \
+        pr_reg[11] = regs->orig_ax;                     \
+        pr_reg[12] = regs->ip;                          \
+        pr_reg[13] = regs->cs & 0xffff;                 \
+        pr_reg[14] = regs->flags;                       \
+        pr_reg[15] = regs->sp;                          \
+        pr_reg[16] = regs->ss & 0xffff;                 \
+} while (0);
+
 #define ELF_PLATFORM    (utsname()->machine)
 #define set_personality_64bit() do { } while (0)
 
@@ -165,6 +190,43 @@ static inline void elf_common_init(struct thread_struct *t,
         } while (0)
 #define COMPAT_ELF_PLATFORM                     ("i686")
 
+/*
+ * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
+ * now struct_user_regs, they are different). Assumes current is the process
+ * getting dumped.
+ */
+
+#define ELF_CORE_COPY_REGS(pr_reg, regs)  do {                  \
+        unsigned v;                                             \
+        (pr_reg)[0] = (regs)->r15;                              \
+        (pr_reg)[1] = (regs)->r14;                              \
+        (pr_reg)[2] = (regs)->r13;                              \
+        (pr_reg)[3] = (regs)->r12;                              \
+        (pr_reg)[4] = (regs)->bp;                               \
+        (pr_reg)[5] = (regs)->bx;                               \
+        (pr_reg)[6] = (regs)->r11;                              \
+        (pr_reg)[7] = (regs)->r10;                              \
+        (pr_reg)[8] = (regs)->r9;                               \
+        (pr_reg)[9] = (regs)->r8;                               \
+        (pr_reg)[10] = (regs)->ax;                              \
+        (pr_reg)[11] = (regs)->cx;                              \
+        (pr_reg)[12] = (regs)->dx;                              \
+        (pr_reg)[13] = (regs)->si;                              \
+        (pr_reg)[14] = (regs)->di;                              \
+        (pr_reg)[15] = (regs)->orig_ax;                         \
+        (pr_reg)[16] = (regs)->ip;                              \
+        (pr_reg)[17] = (regs)->cs;                              \
+        (pr_reg)[18] = (regs)->flags;                           \
+        (pr_reg)[19] = (regs)->sp;                              \
+        (pr_reg)[20] = (regs)->ss;                              \
+        (pr_reg)[21] = current->thread.fs;                      \
+        (pr_reg)[22] = current->thread.gs;                      \
+        asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v;       \
+        asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v;       \
+        asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v;       \
+        asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v;       \
+} while (0);
+
 /* I'm not sure if we can use '-' here */
 #define ELF_PLATFORM       ("x86_64")
 extern void set_personality_64bit(void);