ARM: 6117/1: kdump: implement crash_setup_regs()

Implement machine specific function crash_setup_regs() which is
responsible for storing machine state when crash occured.

Signed-off-by: Mika Westerberg <ext-mika.1.westerberg@nokia.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/include/asm/kexec.h b/arch/arm/include/asm/kexec.h
index df15a0dc228e23da027667d3a992658daadf2305..8ec9ef5c3c7be25a2705451e8aab0a8205a47e67 100644 (file)
--- a/arch/arm/include/asm/kexec.h
+++ b/arch/arm/include/asm/kexec.h
@@ -19,10 +19,26 @@
 
 #ifndef __ASSEMBLY__
 
-struct kimage;
-/* Provide a dummy definition to avoid build failures. */
+/**
+ * crash_setup_regs() - save registers for the panic kernel
+ * @newregs: registers are saved here
+ * @oldregs: registers to be saved (may be %NULL)
+ *
+ * Function copies machine registers from @oldregs to @newregs. If @oldregs is
+ * %NULL then current registers are stored there.
+ */
 static inline void crash_setup_regs(struct pt_regs *newregs,
-                                        struct pt_regs *oldregs) { }
+                                   struct pt_regs *oldregs)
+{
+       if (oldregs) {
+               memcpy(newregs, oldregs, sizeof(*newregs));
+       } else {
+               __asm__ __volatile__ ("stmia %0, {r0 - r15}"
+                                     : : "r" (&newregs->ARM_r0));
+               __asm__ __volatile__ ("mrs %0, cpsr"
+                                     : "=r" (newregs->ARM_cpsr));
+       }
+}
 
 #endif /* __ASSEMBLY__ */