+++ /dev/null
-From: Felix Fietkau <nbd@nbd.name>
-Subject: mips: replace -mlong-calls with -mno-long-calls to make function calls faster in kernel modules to achieve this, try to
-
-lede-commit: 3b3d64743ba2a874df9d70cd19e242205b0a788c
-Signed-off-by: Felix Fietkau <nbd@nbd.name>
----
- arch/mips/Makefile | 5 +
- arch/mips/include/asm/module.h | 5 +
- arch/mips/kernel/module.c | 279 ++++++++++++++++++++++++++++++++++++++++-
- 3 files changed, 284 insertions(+), 5 deletions(-)
-
---- a/arch/mips/Makefile
-+++ b/arch/mips/Makefile
-@@ -93,8 +93,18 @@ all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlin
- cflags-y += -G 0 -mno-abicalls -fno-pic -pipe -mno-branch-likely
- cflags-y += -msoft-float
- LDFLAGS_vmlinux += -G 0 -static -n -nostdlib
-+ifdef CONFIG_64BIT
- KBUILD_AFLAGS_MODULE += -mlong-calls
- KBUILD_CFLAGS_MODULE += -mlong-calls
-+else
-+ ifdef CONFIG_DYNAMIC_FTRACE
-+ KBUILD_AFLAGS_MODULE += -mlong-calls
-+ KBUILD_CFLAGS_MODULE += -mlong-calls
-+ else
-+ KBUILD_AFLAGS_MODULE += -mno-long-calls
-+ KBUILD_CFLAGS_MODULE += -mno-long-calls
-+ endif
-+endif
-
- ifeq ($(CONFIG_RELOCATABLE),y)
- LDFLAGS_vmlinux += --emit-relocs
---- a/arch/mips/include/asm/module.h
-+++ b/arch/mips/include/asm/module.h
-@@ -11,6 +11,11 @@ struct mod_arch_specific {
- const struct exception_table_entry *dbe_start;
- const struct exception_table_entry *dbe_end;
- struct mips_hi16 *r_mips_hi16_list;
-+
-+ void *phys_plt_tbl;
-+ void *virt_plt_tbl;
-+ unsigned int phys_plt_offset;
-+ unsigned int virt_plt_offset;
- };
-
- typedef uint8_t Elf64_Byte; /* Type for a 8-bit quantity. */
---- a/arch/mips/kernel/module.c
-+++ b/arch/mips/kernel/module.c
-@@ -44,14 +44,221 @@ struct mips_hi16 {
- static LIST_HEAD(dbe_list);
- static DEFINE_SPINLOCK(dbe_lock);
-
--#ifdef MODULE_START
-+/*
-+ * Get the potential max trampolines size required of the init and
-+ * non-init sections. Only used if we cannot find enough contiguous
-+ * physically mapped memory to put the module into.
-+ */
-+static unsigned int
-+get_plt_size(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
-+ const char *secstrings, unsigned int symindex, bool is_init)
-+{
-+ unsigned long ret = 0;
-+ unsigned int i, j;
-+ Elf_Sym *syms;
-+
-+ /* Everything marked ALLOC (this includes the exported symbols) */
-+ for (i = 1; i < hdr->e_shnum; ++i) {
-+ unsigned int info = sechdrs[i].sh_info;
-+
-+ if (sechdrs[i].sh_type != SHT_REL
-+ && sechdrs[i].sh_type != SHT_RELA)
-+ continue;
-+
-+ /* Not a valid relocation section? */
-+ if (info >= hdr->e_shnum)
-+ continue;
-+
-+ /* Don't bother with non-allocated sections */
-+ if (!(sechdrs[info].sh_flags & SHF_ALLOC))
-+ continue;
-+
-+ /* If it's called *.init*, and we're not init, we're
-+ not interested */
-+ if ((strstr(secstrings + sechdrs[i].sh_name, ".init") != 0)
-+ != is_init)
-+ continue;
-+
-+ syms = (Elf_Sym *) sechdrs[symindex].sh_addr;
-+ if (sechdrs[i].sh_type == SHT_REL) {
-+ Elf_Mips_Rel *rel = (void *) sechdrs[i].sh_addr;
-+ unsigned int size = sechdrs[i].sh_size / sizeof(*rel);
-+
-+ for (j = 0; j < size; ++j) {
-+ Elf_Sym *sym;
-+
-+ if (ELF_MIPS_R_TYPE(rel[j]) != R_MIPS_26)
-+ continue;
-+
-+ sym = syms + ELF_MIPS_R_SYM(rel[j]);
-+ if (!is_init && sym->st_shndx != SHN_UNDEF)
-+ continue;
-+
-+ ret += 4 * sizeof(int);
-+ }
-+ } else {
-+ Elf_Mips_Rela *rela = (void *) sechdrs[i].sh_addr;
-+ unsigned int size = sechdrs[i].sh_size / sizeof(*rela);
-+
-+ for (j = 0; j < size; ++j) {
-+ Elf_Sym *sym;
-+
-+ if (ELF_MIPS_R_TYPE(rela[j]) != R_MIPS_26)
-+ continue;
-+
-+ sym = syms + ELF_MIPS_R_SYM(rela[j]);
-+ if (!is_init && sym->st_shndx != SHN_UNDEF)
-+ continue;
-+
-+ ret += 4 * sizeof(int);
-+ }
-+ }
-+ }
-+
-+ return ret;
-+}
-+
-+#ifndef MODULE_START
-+static void *alloc_phys(unsigned long size)
-+{
-+ unsigned order;
-+ struct page *page;
-+ struct page *p;
-+
-+ size = PAGE_ALIGN(size);
-+ order = get_order(size);
-+
-+ page = alloc_pages(GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN |
-+ __GFP_THISNODE, order);
-+ if (!page)
-+ return NULL;
-+
-+ split_page(page, order);
-+
-+ /* mark all pages except for the last one */
-+ for (p = page; p + 1 < page + (size >> PAGE_SHIFT); ++p)
-+ set_bit(PG_owner_priv_1, &p->flags);
-+
-+ for (p = page + (size >> PAGE_SHIFT); p < page + (1 << order); ++p)
-+ __free_page(p);
-+
-+ return page_address(page);
-+}
-+#endif
-+
-+static void free_phys(void *ptr)
-+{
-+ struct page *page;
-+ bool free;
-+
-+ page = virt_to_page(ptr);
-+ do {
-+ free = test_and_clear_bit(PG_owner_priv_1, &page->flags);
-+ __free_page(page);
-+ page++;
-+ } while (free);
-+}
-+
-+
- void *module_alloc(unsigned long size)
- {
-+#ifdef MODULE_START
- return __vmalloc_node_range(size, 1, MODULE_START, MODULE_END,
- GFP_KERNEL, PAGE_KERNEL, 0, NUMA_NO_NODE,
- __builtin_return_address(0));
-+#else
-+ void *ptr;
-+
-+ if (size == 0)
-+ return NULL;
-+
-+ ptr = alloc_phys(size);
-+
-+ /* If we failed to allocate physically contiguous memory,
-+ * fall back to regular vmalloc. The module loader code will
-+ * create jump tables to handle long jumps */
-+ if (!ptr)
-+ return vmalloc(size);
-+
-+ return ptr;
-+#endif
- }
-+
-+static inline bool is_phys_addr(void *ptr)
-+{
-+#ifdef CONFIG_64BIT
-+ return (KSEGX((unsigned long)ptr) == CKSEG0);
-+#else
-+ return (KSEGX(ptr) == KSEG0);
- #endif
-+}
-+
-+/* Free memory returned from module_alloc */
-+void module_memfree(void *module_region)
-+{
-+ if (is_phys_addr(module_region))
-+ free_phys(module_region);
-+ else
-+ vfree(module_region);
-+}
-+
-+static void *__module_alloc(int size, bool phys)
-+{
-+ void *ptr;
-+
-+ if (phys)
-+ ptr = kmalloc(size, GFP_KERNEL);
-+ else
-+ ptr = vmalloc(size);
-+ return ptr;
-+}
-+
-+static void __module_free(void *ptr)
-+{
-+ if (is_phys_addr(ptr))
-+ kfree(ptr);
-+ else
-+ vfree(ptr);
-+}
-+
-+int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
-+ char *secstrings, struct module *mod)
-+{
-+ unsigned int symindex = 0;
-+ unsigned int core_size, init_size;
-+ int i;
-+
-+ mod->arch.phys_plt_offset = 0;
-+ mod->arch.virt_plt_offset = 0;
-+ mod->arch.phys_plt_tbl = NULL;
-+ mod->arch.virt_plt_tbl = NULL;
-+
-+ if (IS_ENABLED(CONFIG_64BIT))
-+ return 0;
-+
-+ for (i = 1; i < hdr->e_shnum; i++)
-+ if (sechdrs[i].sh_type == SHT_SYMTAB)
-+ symindex = i;
-+
-+ core_size = get_plt_size(hdr, sechdrs, secstrings, symindex, false);
-+ init_size = get_plt_size(hdr, sechdrs, secstrings, symindex, true);
-+
-+ if ((core_size + init_size) == 0)
-+ return 0;
-+
-+ mod->arch.phys_plt_tbl = __module_alloc(core_size + init_size, 1);
-+ if (!mod->arch.phys_plt_tbl)
-+ return -ENOMEM;
-+
-+ mod->arch.virt_plt_tbl = __module_alloc(core_size + init_size, 0);
-+ if (!mod->arch.virt_plt_tbl) {
-+ __module_free(mod->arch.phys_plt_tbl);
-+ mod->arch.phys_plt_tbl = NULL;
-+ return -ENOMEM;
-+ }
-+
-+ return 0;
-+}
-
- int apply_r_mips_none(struct module *me, u32 *location, Elf_Addr v)
- {
-@@ -65,8 +272,39 @@ static int apply_r_mips_32_rel(struct mo
- return 0;
- }
-
-+static Elf_Addr add_plt_entry_to(unsigned *plt_offset,
-+ void *start, Elf_Addr v)
-+{
-+ unsigned *tramp = start + *plt_offset;
-+ *plt_offset += 4 * sizeof(int);
-+
-+ /* adjust carry for addiu */
-+ if (v & 0x00008000)
-+ v += 0x10000;
-+
-+ tramp[0] = 0x3c190000 | (v >> 16); /* lui t9, hi16 */
-+ tramp[1] = 0x27390000 | (v & 0xffff); /* addiu t9, t9, lo16 */
-+ tramp[2] = 0x03200008; /* jr t9 */
-+ tramp[3] = 0x00000000; /* nop */
-+
-+ return (Elf_Addr) tramp;
-+}
-+
-+static Elf_Addr add_plt_entry(struct module *me, void *location, Elf_Addr v)
-+{
-+ if (is_phys_addr(location))
-+ return add_plt_entry_to(&me->arch.phys_plt_offset,
-+ me->arch.phys_plt_tbl, v);
-+ else
-+ return add_plt_entry_to(&me->arch.virt_plt_offset,
-+ me->arch.virt_plt_tbl, v);
-+
-+}
-+
- static int apply_r_mips_26_rel(struct module *me, u32 *location, Elf_Addr v)
- {
-+ u32 ofs = *location & 0x03ffffff;
-+
- if (v % 4) {
- pr_err("module %s: dangerous R_MIPS_26 REL relocation\n",
- me->name);
-@@ -74,13 +312,17 @@ static int apply_r_mips_26_rel(struct mo
- }
-
- if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
-- pr_err("module %s: relocation overflow\n",
-- me->name);
-- return -ENOEXEC;
-+ v = add_plt_entry(me, location, v + (ofs << 2));
-+ if (!v) {
-+ pr_err("module %s: relocation overflow\n",
-+ me->name);
-+ return -ENOEXEC;
-+ }
-+ ofs = 0;
- }
-
- *location = (*location & ~0x03ffffff) |
-- ((*location + (v >> 2)) & 0x03ffffff);
-+ ((ofs + (v >> 2)) & 0x03ffffff);
-
- return 0;
- }
-@@ -349,9 +591,36 @@ int module_finalize(const Elf_Ehdr *hdr,
- list_add(&me->arch.dbe_list, &dbe_list);
- spin_unlock_irq(&dbe_lock);
- }
-+
-+ /* Get rid of the fixup trampoline if we're running the module
-+ * from physically mapped address space */
-+ if (me->arch.phys_plt_offset == 0) {
-+ __module_free(me->arch.phys_plt_tbl);
-+ me->arch.phys_plt_tbl = NULL;
-+ }
-+ if (me->arch.virt_plt_offset == 0) {
-+ __module_free(me->arch.virt_plt_tbl);
-+ me->arch.virt_plt_tbl = NULL;
-+ }
-+
- return 0;
- }
-
-+void module_arch_freeing_init(struct module *mod)
-+{
-+ if (mod->state == MODULE_STATE_LIVE)
-+ return;
-+
-+ if (mod->arch.phys_plt_tbl) {
-+ __module_free(mod->arch.phys_plt_tbl);
-+ mod->arch.phys_plt_tbl = NULL;
-+ }
-+ if (mod->arch.virt_plt_tbl) {
-+ __module_free(mod->arch.virt_plt_tbl);
-+ mod->arch.virt_plt_tbl = NULL;
-+ }
-+}
-+
- void module_arch_cleanup(struct module *mod)
- {
- spin_lock_irq(&dbe_lock);
projects / openwrt / staging / dedeckeh.git / blobdiff