patch-2.4.19 linux-2.4.19/arch/ppc/kernel/ptrace.c

• Lines: 97
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/arch/ppc/kernel/ptrace.c
• Orig date: Mon Nov 26 05:29:17 2001

diff -urN linux-2.4.18/arch/ppc/kernel/ptrace.c linux-2.4.19/arch/ppc/kernel/ptrace.c
@@ -1,5 +1,5 @@
 /*
- * BK Id: SCCS/s.ptrace.c 1.12 11/23/01 16:38:30 paulus
+ * BK Id: SCCS/s.ptrace.c 1.14 01/17/02 23:05:50 paulus
  */
 /*
  *  linux/arch/ppc/kernel/ptrace.c
@@ -71,6 +71,64 @@
 	return -EIO;
 }
 
+#ifdef CONFIG_ALTIVEC
+/*
+ * Get contents of AltiVec register state in task TASK
+ */
+static inline int get_vrregs(unsigned long *data, struct task_struct *task)
+{
+	int i, j;
+
+	if (!access_ok(VERIFY_WRITE, data, 133 * sizeof(unsigned long)))
+		return -EFAULT;
+
+	/* copy AltiVec registers VR[0] .. VR[31] */
+	for (i = 0; i < 32; i++)
+		for (j = 0; j < 4; j++, data++)
+			if (__put_user(task->thread.vr[i].u[j], data))
+				return -EFAULT;
+
+	/* copy VSCR */
+	for (i = 0; i < 4; i++, data++)
+		if (__put_user(task->thread.vscr.u[i], data))
+			return -EFAULT;
+
+        /* copy VRSAVE */
+	if (__put_user(task->thread.vrsave, 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 *data)
+{
+	int i, j;
+
+	if (!access_ok(VERIFY_READ, data, 133 * sizeof(unsigned long)))
+		return -EFAULT;
+
+	/* copy AltiVec registers VR[0] .. VR[31] */
+	for (i = 0; i < 32; i++)
+		for (j = 0; j < 4; j++, data++) 
+			if (__get_user(task->thread.vr[i].u[j], data))
+				return -EFAULT;
+
+	/* copy VSCR */
+	for (i = 0; i < 4; i++, data++) 
+		if (__get_user(task->thread.vscr.u[i], data))
+			return -EFAULT;
+
+	/* copy VRSAVE */
+	if (__get_user(task->thread.vrsave, data))
+		return -EFAULT;
+
+	return 0;
+}
+#endif
+
 static inline void
 set_single_step(struct task_struct *task)
 {
@@ -259,6 +317,24 @@
 		ret = ptrace_detach(child, data);
 		break;
 
+#ifdef CONFIG_ALTIVEC
+	case PTRACE_GETVRREGS:
+		/* Get the child altivec register state. */
+		if (child->thread.regs->msr & MSR_VEC)
+			giveup_altivec(child);
+		ret = get_vrregs((unsigned long *)data, child);
+		break;
+
+	case PTRACE_SETVRREGS:
+		/* Set the child altivec register state. */
+		/* this is to clear the MSR_VEC bit to force a reload
+		 * of register state from memory */
+		if (child->thread.regs->msr & MSR_VEC)
+			giveup_altivec(child);
+		ret = set_vrregs(child, (unsigned long *)data);
+		break;
+#endif
+
 	default:
 		ret = -EIO;
 		break;