[PATCH] ppc64: Add PTRACE_{GET|SET}VRREGS

[pandora-kernel.git] / include / asm-ppc64 / ptrace-common.h

diff --git a/include/asm-ppc64/ptrace-common.h b/include/asm-ppc64/ptrace-common.h
index af03547..bd0f84c 100644 (file)
--- a/include/asm-ppc64/ptrace-common.h
+++ b/include/asm-ppc64/ptrace-common.h
@@ -11,6 +11,9 @@
 
 #ifndef _PPC64_PTRACE_COMMON_H
 #define _PPC64_PTRACE_COMMON_H
+
+#include <linux/config.h>
+
 /*
  * Set of msr bits that gdb can change on behalf of a process.
  */
@@ -69,4 +72,73 @@ static inline void clear_single_step(struct task_struct *task)
        clear_ti_thread_flag(task->thread_info, TIF_SINGLESTEP);
 }
 
+#ifdef CONFIG_ALTIVEC
+/*
+ * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
+ * The transfer totals 34 quadword.  Quadwords 0-31 contain the
+ * corresponding vector registers.  Quadword 32 contains the vscr as the
+ * last word (offset 12) within that quadword.  Quadword 33 contains the
+ * vrsave as the first word (offset 0) within the quadword.
+ *
+ * This definition of the VMX state is compatible with the current PPC32
+ * ptrace interface.  This allows signal handling and ptrace to use the
+ * same structures.  This also simplifies the implementation of a bi-arch
+ * (combined (32- and 64-bit) gdb.
+ */
+
+/*
+ * Get contents of AltiVec register state in task TASK
+ */
+static inline int get_vrregs(unsigned long __user *data,
+                            struct task_struct *task)
+{
+       unsigned long regsize;
+
+       /* copy AltiVec registers VR[0] .. VR[31] */
+       regsize = 32 * sizeof(vector128);
+       if (copy_to_user(data, task->thread.vr, regsize))
+               return -EFAULT;
+       data += (regsize / sizeof(unsigned long));
+
+       /* copy VSCR */
+       regsize = 1 * sizeof(vector128);
+       if (copy_to_user(data, &task->thread.vscr, regsize))
+               return -EFAULT;
+       data += (regsize / sizeof(unsigned long));
+
+       /* copy VRSAVE */
+       if (put_user(task->thread.vrsave, (u32 __user *)data))
+               return -EFAULT;
+
+       return 0;
+}
+
+/*
+ * Write contents of AltiVec register state into task TASK.
+ */
+static inline int set_vrregs(struct task_struct *task,
+                            unsigned long __user *data)
+{
+       unsigned long regsize;
+
+       /* copy AltiVec registers VR[0] .. VR[31] */
+       regsize = 32 * sizeof(vector128);
+       if (copy_from_user(task->thread.vr, data, regsize))
+               return -EFAULT;
+       data += (regsize / sizeof(unsigned long));
+
+       /* copy VSCR */
+       regsize = 1 * sizeof(vector128);
+       if (copy_from_user(&task->thread.vscr, data, regsize))
+               return -EFAULT;
+       data += (regsize / sizeof(unsigned long));
+
+       /* copy VRSAVE */
+       if (get_user(task->thread.vrsave, (u32 __user *)data))
+               return -EFAULT;
+
+       return 0;
+}
+#endif
+
 #endif /* _PPC64_PTRACE_COMMON_H */