1 files changed, 36 insertions, 0 deletions

diff --git a/include/asm-x86_64/kexec.h b/include/asm-x86_64/kexec.h
index cea78543a574..ae28cd44bcd3 100644
--- a/include/asm-x86_64/kexec.h
+++ b/include/asm-x86_64/kexec.h
@@ -3,6 +3,7 @@
 
 #include <asm/page.h>
 #include <asm/proto.h>
+#include <asm/ptrace.h>
 
 /*
  * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
@@ -27,4 +28,39 @@
 
 #define MAX_NOTE_BYTES 1024
 
+/*
+ * Saving the registers of the cpu on which panic occured in
+ * crash_kexec to save a valid sp. The registers of other cpus
+ * will be saved in machine_crash_shutdown while shooting down them.
+ */
+
+static inline void crash_setup_regs(struct pt_regs *newregs,
+                                                struct pt_regs *oldregs)
+{
+        if (oldregs)
+                memcpy(newregs, oldregs, sizeof(*newregs));
+        else {
+                __asm__ __volatile__("movq %%rbx,%0" : "=m"(newregs->rbx));
+                __asm__ __volatile__("movq %%rcx,%0" : "=m"(newregs->rcx));
+                __asm__ __volatile__("movq %%rdx,%0" : "=m"(newregs->rdx));
+                __asm__ __volatile__("movq %%rsi,%0" : "=m"(newregs->rsi));
+                __asm__ __volatile__("movq %%rdi,%0" : "=m"(newregs->rdi));
+                __asm__ __volatile__("movq %%rbp,%0" : "=m"(newregs->rbp));
+                __asm__ __volatile__("movq %%rax,%0" : "=m"(newregs->rax));
+                __asm__ __volatile__("movq %%rsp,%0" : "=m"(newregs->rsp));
+                __asm__ __volatile__("movq %%r8,%0" : "=m"(newregs->r8));
+                __asm__ __volatile__("movq %%r9,%0" : "=m"(newregs->r9));
+                __asm__ __volatile__("movq %%r10,%0" : "=m"(newregs->r10));
+                __asm__ __volatile__("movq %%r11,%0" : "=m"(newregs->r11));
+                __asm__ __volatile__("movq %%r12,%0" : "=m"(newregs->r12));
+                __asm__ __volatile__("movq %%r13,%0" : "=m"(newregs->r13));
+                __asm__ __volatile__("movq %%r14,%0" : "=m"(newregs->r14));
+                __asm__ __volatile__("movq %%r15,%0" : "=m"(newregs->r15));
+                __asm__ __volatile__("movl %%ss, %%eax;" :"=a"(newregs->ss));
+                __asm__ __volatile__("movl %%cs, %%eax;" :"=a"(newregs->cs));
+                __asm__ __volatile__("pushfq; popq %0" :"=m"(newregs->eflags));
+
+                newregs->rip = (unsigned long)current_text_addr();
+        }
+}
 #endif /* _X86_64_KEXEC_H */