ARM: 9204/2: module: Add all unwind tables when load module

For EABI stack unwinding, when loading .ko module
the EXIDX sections will be added to a unwind_table list.

However not all EXIDX sections are added because EXIDX
sections are searched by hardcoded section names.

For functions in other sections such as .ref.text
or .kprobes.text, gcc generates seprated EXIDX sections
(such as .ARM.exidx.ref.text or .ARM.exidx.kprobes.text).

These extra EXIDX sections are not loaded, so when unwinding
functions in these sections, we will failed with:

	unwind: Index not found xxx

To fix that, I refactor the code for searching and adding
EXIDX sections:

- Check section type to search EXIDX tables (0x70000001)
instead of strcmp() the hardcoded names. Then find the
corresponding text sections by their section names.

- Add a unwind_table list in module->arch to save their own
unwind_table instead of the fixed-lenth array.

- Save .ARM.exidx.init.text section ptr, because it should
be cleaned after module init.

Now all EXIDX sections of .ko can be added correctly.

Signed-off-by: Chen Zhongjin <chenzhongjin@huawei.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

Author: Chen Zhongjin

arch/arm/include/asm/module.h

@@ -3,20 +3,10 @@
 #define _ASM_ARM_MODULE_H
 
 #include <asm-generic/module.h>
-
-struct unwind_table;
+#include <asm/unwind.h>
 
 #ifdef CONFIG_ARM_UNWIND
-enum {
-	ARM_SEC_INIT,
-	ARM_SEC_DEVINIT,
-	ARM_SEC_CORE,
-	ARM_SEC_EXIT,
-	ARM_SEC_DEVEXIT,
-	ARM_SEC_HOT,
-	ARM_SEC_UNLIKELY,
-	ARM_SEC_MAX,
-};
+#define ELF_SECTION_UNWIND 0x70000001
 #endif
 
 #define PLT_ENT_STRIDE		L1_CACHE_BYTES
@@ -36,7 +26,8 @@ struct mod_plt_sec {
 
 struct mod_arch_specific {
 #ifdef CONFIG_ARM_UNWIND
-	struct unwind_table *unwind[ARM_SEC_MAX];
+	struct list_head unwind_list;
+	struct unwind_table *init_table;
 #endif
 #ifdef CONFIG_ARM_MODULE_PLTS
 	struct mod_plt_sec	core;

arch/arm/include/asm/unwind.h

@@ -24,6 +24,7 @@ struct unwind_idx {
 
 struct unwind_table {
 	struct list_head list;
+	struct list_head mod_list;
 	const struct unwind_idx *start;
 	const struct unwind_idx *origin;
 	const struct unwind_idx *stop;

arch/arm/kernel/module.c

@@ -459,46 +459,40 @@ int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
 #ifdef CONFIG_ARM_UNWIND
 	const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
 	const Elf_Shdr *sechdrs_end = sechdrs + hdr->e_shnum;
-	struct mod_unwind_map maps[ARM_SEC_MAX];
-	int i;
+	struct list_head *unwind_list = &mod->arch.unwind_list;
 
-	memset(maps, 0, sizeof(maps));
+	INIT_LIST_HEAD(unwind_list);
+	mod->arch.init_table = NULL;
 
 	for (s = sechdrs; s < sechdrs_end; s++) {
 		const char *secname = secstrs + s->sh_name;
+		const char *txtname;
+		const Elf_Shdr *txt_sec;
 
-		if (!(s->sh_flags & SHF_ALLOC))
+		if (!(s->sh_flags & SHF_ALLOC) ||
+		    s->sh_type != ELF_SECTION_UNWIND)
 			continue;
 
-		if (strcmp(".ARM.exidx.init.text", secname) == 0)
-			maps[ARM_SEC_INIT].unw_sec = s;
-		else if (strcmp(".ARM.exidx", secname) == 0)
-			maps[ARM_SEC_CORE].unw_sec = s;
-		else if (strcmp(".ARM.exidx.exit.text", secname) == 0)
-			maps[ARM_SEC_EXIT].unw_sec = s;
-		else if (strcmp(".ARM.exidx.text.unlikely", secname) == 0)
-			maps[ARM_SEC_UNLIKELY].unw_sec = s;
-		else if (strcmp(".ARM.exidx.text.hot", secname) == 0)
-			maps[ARM_SEC_HOT].unw_sec = s;
-		else if (strcmp(".init.text", secname) == 0)
-			maps[ARM_SEC_INIT].txt_sec = s;
-		else if (strcmp(".text", secname) == 0)
-			maps[ARM_SEC_CORE].txt_sec = s;
-		else if (strcmp(".exit.text", secname) == 0)
-			maps[ARM_SEC_EXIT].txt_sec = s;
-		else if (strcmp(".text.unlikely", secname) == 0)
-			maps[ARM_SEC_UNLIKELY].txt_sec = s;
-		else if (strcmp(".text.hot", secname) == 0)
-			maps[ARM_SEC_HOT].txt_sec = s;
-	}
+		if (!strcmp(".ARM.exidx", secname))
+			txtname = ".text";
+		else
+			txtname = secname + strlen(".ARM.exidx");
+		txt_sec = find_mod_section(hdr, sechdrs, txtname);
+
+		if (txt_sec) {
+			struct unwind_table *table =
+				unwind_table_add(s->sh_addr,
+						s->sh_size,
+						txt_sec->sh_addr,
+						txt_sec->sh_size);
 
-	for (i = 0; i < ARM_SEC_MAX; i++)
-		if (maps[i].unw_sec && maps[i].txt_sec)
-			mod->arch.unwind[i] =
-				unwind_table_add(maps[i].unw_sec->sh_addr,
-					         maps[i].unw_sec->sh_size,
-					         maps[i].txt_sec->sh_addr,
-					         maps[i].txt_sec->sh_size);
+			list_add(&table->mod_list, unwind_list);
+
+			/* save init table for module_arch_freeing_init */
+			if (strcmp(".ARM.exidx.init.text", secname) == 0)
+				mod->arch.init_table = table;
+		}
+	}
 #endif
 #ifdef CONFIG_ARM_PATCH_PHYS_VIRT
 	s = find_mod_section(hdr, sechdrs, ".pv_table");
@@ -519,19 +513,27 @@ void
 module_arch_cleanup(struct module *mod)
 {
 #ifdef CONFIG_ARM_UNWIND
-	int i;
+	struct unwind_table *tmp;
+	struct unwind_table *n;
 
-	for (i = 0; i < ARM_SEC_MAX; i++) {
-		unwind_table_del(mod->arch.unwind[i]);
-		mod->arch.unwind[i] = NULL;
+	list_for_each_entry_safe(tmp, n,
+			&mod->arch.unwind_list, mod_list) {
+		list_del(&tmp->mod_list);
+		unwind_table_del(tmp);
 	}
+	mod->arch.init_table = NULL;
 #endif
 }
 
 void __weak module_arch_freeing_init(struct module *mod)
 {
 #ifdef CONFIG_ARM_UNWIND
-	unwind_table_del(mod->arch.unwind[ARM_SEC_INIT]);
-	mod->arch.unwind[ARM_SEC_INIT] = NULL;
+	struct unwind_table *init = mod->arch.init_table;
+
+	if (init) {
+		mod->arch.init_table = NULL;
+		list_del(&init->mod_list);
+		unwind_table_del(init);
+	}
 #endif
 }