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diff --git a/sys/kern/sys_process.c b/sys/kern/sys_process.c
--- a/sys/kern/sys_process.c
+++ b/sys/kern/sys_process.c
@@ -190,8 +190,21 @@
if (regset == NULL)
return (EINVAL);
+ if (regset->get == NULL)
+ return (EINVAL);
+
+ size = regset->size;
+ /*
+ * The regset is dynamically sized, e.g. the size could change
+ * depending on the hardware, or may have a per-thread size.
+ */
+ if (size == 0) {
+ if (!regset->get(regset, td, NULL, &size))
+ return (EINVAL);
+ }
+
if (iov->iov_base == NULL) {
- iov->iov_len = regset->size;
+ iov->iov_len = size;
if (iov->iov_len == 0)
return (EINVAL);
@@ -199,14 +212,10 @@
}
/* The length is wrong, return an error */
- if (iov->iov_len != regset->size)
- return (EINVAL);
-
- if (regset->get == NULL)
+ if (iov->iov_len != size)
return (EINVAL);
error = 0;
- size = regset->size;
p = td->td_proc;
/* Drop the proc lock while allocating the temp buffer */
@@ -218,7 +227,7 @@
if (!regset->get(regset, td, buf, &size)) {
error = EINVAL;
} else {
- KASSERT(size == regset->size,
+ KASSERT(size == regset->size || regset->size == 0,
("%s: Getter function changed the size", __func__));
iov->iov_len = size;
@@ -245,14 +254,23 @@
if (regset == NULL)
return (EINVAL);
+ size = regset->size;
+ /*
+ * The regset is dynamically sized, e.g. the size could change
+ * depending on the hardware, or may have a per-thread size.
+ */
+ if (size == 0) {
+ if (!regset->get(regset, td, NULL, &size))
+ return (EINVAL);
+ }
+
/* The length is wrong, return an error */
- if (iov->iov_len != regset->size)
+ if (iov->iov_len != size)
return (EINVAL);
if (regset->set == NULL)
return (EINVAL);
- size = regset->size;
p = td->td_proc;
/* Drop the proc lock while allocating the temp buffer */

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