ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/arch/sparc/mm/extable.c b/marvell/linux/arch/sparc/mm/extable.c
new file mode 100644
index 0000000..241b406
--- /dev/null
+++ b/marvell/linux/arch/sparc/mm/extable.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/arch/sparc/mm/extable.c
+ */
+
+#include <linux/module.h>
+#include <linux/extable.h>
+#include <linux/uaccess.h>
+
+void sort_extable(struct exception_table_entry *start,
+ struct exception_table_entry *finish)
+{
+}
+
+/* Caller knows they are in a range if ret->fixup == 0 */
+const struct exception_table_entry *
+search_extable(const struct exception_table_entry *base,
+ const size_t num,
+ unsigned long value)
+{
+ int i;
+
+ /* Single insn entries are encoded as:
+ * word 1: insn address
+ * word 2: fixup code address
+ *
+ * Range entries are encoded as:
+ * word 1: first insn address
+ * word 2: 0
+ * word 3: last insn address + 4 bytes
+ * word 4: fixup code address
+ *
+ * Deleted entries are encoded as:
+ * word 1: unused
+ * word 2: -1
+ *
+ * See asm/uaccess.h for more details.
+ */
+
+ /* 1. Try to find an exact match. */
+ for (i = 0; i < num; i++) {
+ if (base[i].fixup == 0) {
+ /* A range entry, skip both parts. */
+ i++;
+ continue;
+ }
+
+ /* A deleted entry; see trim_init_extable */
+ if (base[i].fixup == -1)
+ continue;
+
+ if (base[i].insn == value)
+ return &base[i];
+ }
+
+ /* 2. Try to find a range match. */
+ for (i = 0; i < (num - 1); i++) {
+ if (base[i].fixup)
+ continue;
+
+ if (base[i].insn <= value && base[i + 1].insn > value)
+ return &base[i];
+
+ i++;
+ }
+
+ return NULL;
+}
+
+#ifdef CONFIG_MODULES
+/* We could memmove them around; easier to mark the trimmed ones. */
+void trim_init_extable(struct module *m)
+{
+ unsigned int i;
+ bool range;
+
+ for (i = 0; i < m->num_exentries; i += range ? 2 : 1) {
+ range = m->extable[i].fixup == 0;
+
+ if (within_module_init(m->extable[i].insn, m)) {
+ m->extable[i].fixup = -1;
+ if (range)
+ m->extable[i+1].fixup = -1;
+ }
+ if (range)
+ i++;
+ }
+}
+#endif /* CONFIG_MODULES */
+
+/* Special extable search, which handles ranges. Returns fixup */
+unsigned long search_extables_range(unsigned long addr, unsigned long *g2)
+{
+ const struct exception_table_entry *entry;
+
+ entry = search_exception_tables(addr);
+ if (!entry)
+ return 0;
+
+ /* Inside range? Fix g2 and return correct fixup */
+ if (!entry->fixup) {
+ *g2 = (addr - entry->insn) / 4;
+ return (entry + 1)->fixup;
+ }
+
+ return entry->fixup;
+}