Implement HAVE_MOD_ARCH_SPECIFIC Kconfig and module_frob_arch_sections()
function prototype from Linux module subsystem.
module_frob_arch_sections() should be implemented by any architecture
that selects HAVE_MOD_ARCH_SPECIFIC, and is called from load_module()
Signed-off-by: David Dgien <dgienda125@xxxxxxxxx>
---
common/Kconfig | 7 ++++++
common/module.c | 14 +++++++++++
include/asm-generic/module.h | 49 ++++++++++++++++++++++++++++++++++++
include/module.h | 7 ++++++
4 files changed, 77 insertions(+)
create mode 100644 include/asm-generic/module.h
diff --git a/common/Kconfig b/common/Kconfig
index f150092af..c84a33266 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -326,6 +326,13 @@ config MODULES
way to compile modules and the list of exported symbols to actually
make use of modules is short to nonexistent
+config HAVE_MOD_ARCH_SPECIFIC
+ bool
+ help
+ The arch uses struct mod_arch_specific to store data. Many arches
+ just need a simple module loader without arch specific data - those
+ should not enable this.
+
config KALLSYMS
depends on HAS_KALLSYMS
bool "kallsyms"
diff --git a/common/module.c b/common/module.c
index b08df1199..a79bc734b 100644
--- a/common/module.c
+++ b/common/module.c
@@ -176,6 +176,14 @@ static void layout_sections( struct module *mod,
debug("core_size: %ld\n", mod->core_size);
}
+int __weak module_frob_arch_sections(Elf_Ehdr *hdr,
+ Elf_Shdr *sechdrs,
+ char *secstrings,
+ struct module *mod)
+{
+ return 0;
+}
+
static void register_module_cmds(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex)
{
Elf32_Sym *sym;
@@ -271,6 +279,12 @@ struct module * load_module(void *mod_image, unsigned long len)
goto cleanup;
}
+ /* Allow arches to frob section contents and sizes. */
+ err = module_frob_arch_sections(ehdr, sechdrs,
+ secstrings, module);
+ if (err < 0)
+ goto cleanup;
+
/* Determine total sizes, and put offsets in sh_entsize. For now
this is done generically; there doesn't appear to be any
special cases for the architectures. */
diff --git a/include/asm-generic/module.h b/include/asm-generic/module.h
new file mode 100644
index 000000000..98e1541b7
--- /dev/null
+++ b/include/asm-generic/module.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_GENERIC_MODULE_H
+#define __ASM_GENERIC_MODULE_H
+
+/*
+ * Many architectures just need a simple module
+ * loader without arch specific data.
+ */
+#ifndef CONFIG_HAVE_MOD_ARCH_SPECIFIC
+struct mod_arch_specific
+{
+};
+#endif
+
+#ifdef CONFIG_64BIT
+#define Elf_Shdr Elf64_Shdr
+#define Elf_Phdr Elf64_Phdr
+#define Elf_Sym Elf64_Sym
+#define Elf_Dyn Elf64_Dyn
+#define Elf_Ehdr Elf64_Ehdr
+#define Elf_Addr Elf64_Addr
+#ifdef CONFIG_MODULES_USE_ELF_REL
+#define Elf_Rel Elf64_Rel
+#endif
+#ifdef CONFIG_MODULES_USE_ELF_RELA
+#define Elf_Rela Elf64_Rela
+#endif
+#define ELF_R_TYPE(X) ELF64_R_TYPE(X)
+#define ELF_R_SYM(X) ELF64_R_SYM(X)
+
+#else /* CONFIG_64BIT */
+
+#define Elf_Shdr Elf32_Shdr
+#define Elf_Phdr Elf32_Phdr
+#define Elf_Sym Elf32_Sym
+#define Elf_Dyn Elf32_Dyn
+#define Elf_Ehdr Elf32_Ehdr
+#define Elf_Addr Elf32_Addr
+#ifdef CONFIG_MODULES_USE_ELF_REL
+#define Elf_Rel Elf32_Rel
+#endif
+#ifdef CONFIG_MODULES_USE_ELF_RELA
+#define Elf_Rela Elf32_Rela
+#endif
+#define ELF_R_TYPE(X) ELF32_R_TYPE(X)
+#define ELF_R_SYM(X) ELF32_R_SYM(X)
+#endif
+
+#endif /* __ASM_GENERIC_MODULE_H */
diff --git a/include/module.h b/include/module.h
index f416cd0ae..9099e5aee 100644
--- a/include/module.h
+++ b/include/module.h
@@ -122,6 +122,13 @@ int apply_relocate_add(Elf_Shdr *sechdrs,
unsigned int symindex,
unsigned int relsec,
struct module *mod);
+
+/* Adjust arch-specific sections. Return 0 on success. */
+int module_frob_arch_sections(Elf_Ehdr *hdr,
+ Elf_Shdr *sechdrs,
+ char *secstrings,
+ struct module *mod);
+
#endif /* CONFIG_MODULES */
extern struct list_head module_list;
--
2.27.0
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