Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/csky/kernel/module.c b/arch/csky/kernel/module.c
new file mode 100644
index 0000000..b5ad7d9
--- /dev/null
+++ b/arch/csky/kernel/module.c
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/moduleloader.h>
+#include <linux/elf.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <asm/pgtable.h>
+
+#ifdef CONFIG_CPU_CK810
+#define IS_BSR32(hi16, lo16) (((hi16) & 0xFC00) == 0xE000)
+#define IS_JSRI32(hi16, lo16) ((hi16) == 0xEAE0)
+
+#define CHANGE_JSRI_TO_LRW(addr) do { \
+ *(uint16_t *)(addr) = (*(uint16_t *)(addr) & 0xFF9F) | 0x001a; \
+ *((uint16_t *)(addr) + 1) = *((uint16_t *)(addr) + 1) & 0xFFFF; \
+} while (0)
+
+#define SET_JSR32_R26(addr) do { \
+ *(uint16_t *)(addr) = 0xE8Fa; \
+ *((uint16_t *)(addr) + 1) = 0x0000; \
+} while (0)
+
+static void jsri_2_lrw_jsr(uint32_t *location)
+{
+ uint16_t *location_tmp = (uint16_t *)location;
+
+ if (IS_BSR32(*location_tmp, *(location_tmp + 1)))
+ return;
+
+ if (IS_JSRI32(*location_tmp, *(location_tmp + 1))) {
+ /* jsri 0x... --> lrw r26, 0x... */
+ CHANGE_JSRI_TO_LRW(location);
+ /* lsli r0, r0 --> jsr r26 */
+ SET_JSR32_R26(location + 1);
+ }
+}
+#else
+static void inline jsri_2_lrw_jsr(uint32_t *location)
+{
+ return;
+}
+#endif
+
+int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
+ unsigned int symindex, unsigned int relsec, struct module *me)
+{
+ unsigned int i;
+ Elf32_Rela *rel = (void *) sechdrs[relsec].sh_addr;
+ Elf32_Sym *sym;
+ uint32_t *location;
+ short *temp;
+
+ for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
+ /* This is where to make the change */
+ location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
+ + rel[i].r_offset;
+ sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
+ + ELF32_R_SYM(rel[i].r_info);
+
+ switch (ELF32_R_TYPE(rel[i].r_info)) {
+ case R_CSKY_32:
+ /* We add the value into the location given */
+ *location = rel[i].r_addend + sym->st_value;
+ break;
+ case R_CSKY_PC32:
+ /* Add the value, subtract its postition */
+ *location = rel[i].r_addend + sym->st_value
+ - (uint32_t)location;
+ break;
+ case R_CSKY_PCRELJSR_IMM11BY2:
+ break;
+ case R_CSKY_PCRELJSR_IMM26BY2:
+ jsri_2_lrw_jsr(location);
+ break;
+ case R_CSKY_ADDR_HI16:
+ temp = ((short *)location) + 1;
+ *temp = (short)
+ ((rel[i].r_addend + sym->st_value) >> 16);
+ break;
+ case R_CSKY_ADDR_LO16:
+ temp = ((short *)location) + 1;
+ *temp = (short)
+ ((rel[i].r_addend + sym->st_value) & 0xffff);
+ break;
+ default:
+ pr_err("module %s: Unknown relocation: %u\n",
+ me->name, ELF32_R_TYPE(rel[i].r_info));
+ return -ENOEXEC;
+ }
+ }
+ return 0;
+}