riscv/kernel/patch.c

22 	size_t len;
66 static int __patch_insn_set(void *addr, u8 c, size_t len)
68 	bool across_pages = (offset_in_page(addr) + len) > PAGE_SIZE;
74 	if (len + offset_in_page(addr) > 2 * PAGE_SIZE)
90 	memset(waddr, c, len);
98 				 (unsigned long)waddr + len);
111 static int __patch_insn_write(void *addr, const void *insn, size_t len)
113 	bool across_pages = (offset_in_page(addr) + len) > PAGE_SIZE;
120 	if (len + offset_in_page(addr) > 2 * PAGE_SIZE)
144 	ret = copy_to_kernel_nofault(waddr, insn, len);
152 				 (unsigned long)waddr + len);
165 static int __patch_insn_set(void *addr, u8 c, size_t len)
167 	memset(addr, c, len);
173 static int __patch_insn_write(void *addr, const void *insn, size_t len)
175 	return copy_to_kernel_nofault(addr, insn, len);
180 static int patch_insn_set(void *addr, u8 c, size_t len)
187 	 * loop with len <= 2 * PAGE_SIZE.
189 	while (len) {
190 		size = min(len, PAGE_SIZE * 2 - offset_in_page(addr));
196 		len -= size;
203 int patch_text_set_nosync(void *addr, u8 c, size_t len)
207 	ret = patch_insn_set(addr, c, len);
209 		flush_icache_range((uintptr_t)addr, (uintptr_t)addr + len);
215 int patch_insn_write(void *addr, const void *insn, size_t len)
222 	 * because __patch_insn_write() can only handle len <= 2 * PAGE_SIZE.
224 	while (len) {
225 		size = min(len, PAGE_SIZE * 2 - offset_in_page(addr));
232 		len -= size;
239 int patch_text_nosync(void *addr, const void *insns, size_t len)
243 	ret = patch_insn_write(addr, insns, len);
245 		flush_icache_range((uintptr_t)addr, (uintptr_t)addr + len);
257 		ret = patch_insn_write(patch->addr, patch->insns, patch->len);
277 int patch_text(void *addr, u32 *insns, size_t len)
283 		.len = len,