uml: fix x86_64 core dump crash

[pandora-kernel.git] / arch / um / os-Linux / sys-x86_64 / registers.c

diff --git a/arch/um/os-Linux/sys-x86_64/registers.c b/arch/um/os-Linux/sys-x86_64/registers.c
index a2d7e0c..9467315 100644 (file)
--- a/arch/um/os-Linux/sys-x86_64/registers.c
+++ b/arch/um/os-Linux/sys-x86_64/registers.c
@@ -4,6 +4,7 @@
  */
 
 #include <errno.h>
+#include <sys/ptrace.h>
 #include <string.h>
 #include "ptrace_user.h"
 #include "uml-config.h"
@@ -14,9 +15,23 @@
 
 /* These are set once at boot time and not changed thereafter */
 
-static unsigned long exec_regs[HOST_FRAME_SIZE];
+static unsigned long exec_regs[MAX_REG_NR];
 static unsigned long exec_fp_regs[HOST_FP_SIZE];
 
+int save_fp_registers(int pid, unsigned long *fp_regs)
+{
+       if(ptrace(PTRACE_GETFPREGS, pid, 0, fp_regs) < 0)
+               return -errno;
+       return 0;
+}
+
+int restore_fp_registers(int pid, unsigned long *fp_regs)
+{
+       if(ptrace(PTRACE_SETFPREGS, pid, 0, fp_regs) < 0)
+               return -errno;
+       return 0;
+}
+
 void init_thread_registers(union uml_pt_regs *to)
 {
        memcpy(to->skas.regs, exec_regs, sizeof(to->skas.regs));
@@ -72,7 +87,7 @@ void init_registers(int pid)
 
 void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
 {
-       memcpy(regs, exec_regs, HOST_FRAME_SIZE * sizeof(unsigned long));
+       memcpy(regs, exec_regs, sizeof(exec_regs));
        if(fp_regs != NULL)
                memcpy(fp_regs, exec_fp_regs,
                       HOST_FP_SIZE * sizeof(unsigned long));