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-rw-r--r--kernel/regset.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/kernel/regset.c b/kernel/regset.c
new file mode 100644
index 000000000000..6b39fa0993ec
--- /dev/null
+++ b/kernel/regset.c
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/export.h>
+#include <linux/slab.h>
+#include <linux/regset.h>
+
+static int __regset_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int size,
+ void **data)
+{
+ void *p = *data, *to_free = NULL;
+ int res;
+
+ if (!regset->get)
+ return -EOPNOTSUPP;
+ if (size > regset->n * regset->size)
+ size = regset->n * regset->size;
+ if (!p) {
+ to_free = p = kzalloc(size, GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+ }
+ res = regset->get(target, regset, 0, size, p, NULL);
+ if (unlikely(res < 0)) {
+ kfree(to_free);
+ return res;
+ }
+ *data = p;
+ if (regset->get_size) { // arm64-only kludge, will go away
+ unsigned max_size = regset->get_size(target, regset);
+ if (size > max_size)
+ size = max_size;
+ }
+ return size;
+}
+
+int regset_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int size,
+ void *data)
+{
+ return __regset_get(target, regset, size, &data);
+}
+EXPORT_SYMBOL(regset_get);
+
+int regset_get_alloc(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int size,
+ void **data)
+{
+ *data = NULL;
+ return __regset_get(target, regset, size, data);
+}
+EXPORT_SYMBOL(regset_get_alloc);