This implements user_regset-style accessors for the powerpc SPE data,
and rewrites the existing ptrace code in terms of those calls.
Signed-off-by: Roland McGrath <[email protected]>
---
arch/powerpc/kernel/ptrace.c | 90 ++++++++++++++++++++++++++---------------
1 files changed, 57 insertions(+), 33 deletions(-)
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index 7cdf35a..8c25b00 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -272,55 +272,79 @@ static int set_vrregs(struct task_struct *task, unsigned long __user *data)
* }
*/
-/*
- * Get contents of SPE register state in task TASK.
- */
-static int get_evrregs(unsigned long *data, struct task_struct *task)
+static int evr_active(struct task_struct *target,
+ const struct user_regset *regset)
{
- int i;
+ flush_spe_to_thread(target);
+ return target->thread.used_spe ? regset->n : 0;
+}
- if (!access_ok(VERIFY_WRITE, data, 35 * sizeof(unsigned long)))
- return -EFAULT;
+static int evr_get(struct task_struct *target, const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ int ret;
- /* copy SPEFSCR */
- if (__put_user(task->thread.spefscr, &data[34]))
- return -EFAULT;
+ flush_spe_to_thread(target);
- /* copy SPE registers EVR[0] .. EVR[31] */
- for (i = 0; i < 32; i++, data++)
- if (__put_user(task->thread.evr[i], data))
- return -EFAULT;
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &target->thread.evr,
+ 0, sizeof(target->thread.evr));
- /* copy ACC */
- if (__put_user64(task->thread.acc, (unsigned long long *)data))
- return -EFAULT;
+ BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
+ offsetof(struct thread_struct, spefscr));
- return 0;
+ if (!ret)
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &target->thread.acc,
+ sizeof(target->thread.evr), -1);
+
+ return ret;
+}
+
+static int evr_set(struct task_struct *target, const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ int ret;
+
+ flush_spe_to_thread(target);
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &target->thread.evr,
+ 0, sizeof(target->thread.evr));
+
+ BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
+ offsetof(struct thread_struct, spefscr));
+
+ if (!ret)
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &target->thread.acc,
+ sizeof(target->thread.evr), -1);
+
+ return ret;
}
/*
- * Write contents of SPE register state into task TASK.
+ * Get contents of SPE register state in task TASK.
*/
-static int set_evrregs(struct task_struct *task, unsigned long *data)
+static int get_evrregs(unsigned long __user *data, struct task_struct *task)
{
- int i;
-
- if (!access_ok(VERIFY_READ, data, 35 * sizeof(unsigned long)))
+ if (!access_ok(VERIFY_WRITE, data, 35 * sizeof(u32)))
return -EFAULT;
- /* copy SPEFSCR */
- if (__get_user(task->thread.spefscr, &data[34]))
- return -EFAULT;
+ return evr_get(task, NULL, 0, 35 * sizeof(u32), NULL, data);
+}
- /* copy SPE registers EVR[0] .. EVR[31] */
- for (i = 0; i < 32; i++, data++)
- if (__get_user(task->thread.evr[i], data))
- return -EFAULT;
- /* copy ACC */
- if (__get_user64(task->thread.acc, (unsigned long long*)data))
+/*
+ * Write contents of SPE register state into task TASK.
+ */
+static int set_evrregs(struct task_struct *task, unsigned long *data)
+{
+ if (!access_ok(VERIFY_READ, data, 35 * sizeof(u32)))
return -EFAULT;
- return 0;
+ return evr_set(task, NULL, 0, 35 * sizeof(u32), NULL, data);
}
#endif /* CONFIG_SPE */
--
1.5.3.6
--
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