Blackfin: fix module reloc handling for all memory regions

The current module relocation code has spotty handling wrt different
memory regions (like L1 instruction).  Rather than try to fix each
little spot, use the new common memory functions to greatly simplify
everything and make sure it is always correct.
Signed-off-by: NMike Frysinger <vapier@gentoo.org>

arch/blackfin/kernel/module.c

@@ -37,6 +37,7 @@
 #include <linux/kernel.h>
 #include <asm/dma.h>
 #include <asm/cacheflush.h>
+#include <asm/uaccess.h>
 
 void *module_alloc(unsigned long size)
 {
@@ -199,26 +200,23 @@ apply_relocate(Elf_Shdr * sechdrs, const char *strtab,
 /*            gas does not generate it.                                  */
 /*************************************************************************/
 int
-apply_relocate_add(Elf_Shdr * sechdrs, const char *strtab,
+apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
 		   unsigned int symindex, unsigned int relsec,
 		   struct module *mod)
 {
 	unsigned int i;
-	unsigned short tmp;
 	Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
 	Elf32_Sym *sym;
-	uint32_t *location32;
-	uint16_t *location16;
-	uint32_t value;
+	unsigned long location, value, size;
 
 	pr_debug("applying relocate section %u to %u\n", mod->name,
 		relsec, sechdrs[relsec].sh_info);
+
 	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
 		/* This is where to make the change */
-		location16 =
-		    (uint16_t *) (sechdrs[sechdrs[relsec].sh_info].sh_addr +
-				  rel[i].r_offset);
-		location32 = (uint32_t *) location16;
+		location = sechdrs[sechdrs[relsec].sh_info].sh_addr +
+		           rel[i].r_offset;
+
 		/* This is the symbol it is referring to. Note that all
 		   undefined symbols have been resolved. */
 		sym = (Elf32_Sym *) sechdrs[symindex].sh_addr
@@ -227,39 +225,28 @@ apply_relocate_add(Elf_Shdr * sechdrs, const char *strtab,
 		value += rel[i].r_addend;
 
 #ifdef CONFIG_SMP
-		if ((unsigned long)location16 >= COREB_L1_DATA_A_START) {
+		if (location >= COREB_L1_DATA_A_START) {
 			pr_err("cannot relocate in L1: %u (SMP kernel)",
 				mod->name, ELF32_R_TYPE(rel[i].r_info));
 			return -ENOEXEC;
 		}
 #endif
 
-		pr_debug("location is %lx, value is %x type is %d\n",
-			mod->name, (unsigned long)location32, value,
-			ELF32_R_TYPE(rel[i].r_info));
+		pr_debug("location is %lx, value is %lx type is %d\n",
+			mod->name, location, value, ELF32_R_TYPE(rel[i].r_info));
 
 		switch (ELF32_R_TYPE(rel[i].r_info)) {
 
-		case R_BFIN_LUIMM16:
-			tmp = (value & 0xffff);
-			if ((unsigned long)location16 >= L1_CODE_START) {
-				dma_memcpy(location16, &tmp, 2);
-			} else
-				*location16 = tmp;
-			break;
 		case R_BFIN_HUIMM16:
-			tmp = ((value >> 16) & 0xffff);
-			if ((unsigned long)location16 >= L1_CODE_START) {
-				dma_memcpy(location16, &tmp, 2);
-			} else
-				*location16 = tmp;
-			break;
+			value >>= 16;
+		case R_BFIN_LUIMM16:
 		case R_BFIN_RIMM16:
-			*location16 = (value & 0xffff);
+			size = 2;
 			break;
 		case R_BFIN_BYTE4_DATA:
-			*location32 = value;
+			size = 4;
 			break;
+
 		case R_BFIN_PCREL24:
 		case R_BFIN_PCREL24_JUMP_L:
 		case R_BFIN_PCREL12_JUMP:
@@ -268,12 +255,31 @@ apply_relocate_add(Elf_Shdr * sechdrs, const char *strtab,
 			pr_err("unsupported relocation: %u (no -mlong-calls?)\n",
 				mod->name, ELF32_R_TYPE(rel[i].r_info));
 			return -ENOEXEC;
+
 		default:
 			pr_err("unknown relocation: %u\n", mod->name,
 				ELF32_R_TYPE(rel[i].r_info));
 			return -ENOEXEC;
 		}
+
+		switch (bfin_mem_access_type(location, size)) {
+		case BFIN_MEM_ACCESS_CORE:
+		case BFIN_MEM_ACCESS_CORE_ONLY:
+			memcpy((void *)location, &value, size);
+			break;
+		case BFIN_MEM_ACCESS_DMA:
+			dma_memcpy((void *)location, &value, size);
+			break;
+		case BFIN_MEM_ACCESS_ITEST:
+			isram_memcpy((void *)location, &value, size);
+			break;
+		default:
+			pr_err("invalid relocation for %#lx\n",
+				mod->name, location);
+			return -ENOEXEC;
+		}
 	}
+
 	return 0;
 }