diff options
Diffstat (limited to 'arch/powerpc/include/asm/module.h')
-rw-r--r-- | arch/powerpc/include/asm/module.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/module.h b/arch/powerpc/include/asm/module.h new file mode 100644 index 0000000000..a8e2e8339f --- /dev/null +++ b/arch/powerpc/include/asm/module.h @@ -0,0 +1,89 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef _ASM_POWERPC_MODULE_H +#define _ASM_POWERPC_MODULE_H +#ifdef __KERNEL__ + +#include <linux/list.h> +#include <asm/bug.h> +#include <asm-generic/module.h> + +#ifndef __powerpc64__ +/* + * Thanks to Paul M for explaining this. + * + * PPC can only do rel jumps += 32MB, and often the kernel and other + * modules are further away than this. So, we jump to a table of + * trampolines attached to the module (the Procedure Linkage Table) + * whenever that happens. + */ + +struct ppc_plt_entry { + /* 16 byte jump instruction sequence (4 instructions) */ + unsigned int jump[4]; +}; +#endif /* __powerpc64__ */ + + +struct mod_arch_specific { +#ifdef __powerpc64__ + unsigned int stubs_section; /* Index of stubs section in module */ +#ifdef CONFIG_PPC_KERNEL_PCREL + unsigned int got_section; /* What section is the GOT? */ + unsigned int pcpu_section; /* .data..percpu section */ +#else + unsigned int toc_section; /* What section is the TOC? */ + bool toc_fixed; /* Have we fixed up .TOC.? */ +#endif + + /* For module function descriptor dereference */ + unsigned long start_opd; + unsigned long end_opd; +#else /* powerpc64 */ + /* Indices of PLT sections within module. */ + unsigned int core_plt_section; + unsigned int init_plt_section; +#endif /* powerpc64 */ + +#ifdef CONFIG_DYNAMIC_FTRACE + unsigned long tramp; + unsigned long tramp_regs; +#endif + + /* List of BUG addresses, source line numbers and filenames */ + struct list_head bug_list; + struct bug_entry *bug_table; + unsigned int num_bugs; +}; + +/* + * Select ELF headers. + * Make empty sections for module_frob_arch_sections to expand. + */ + +#ifdef __powerpc64__ +# ifdef MODULE + asm(".section .stubs,\"ax\",@nobits; .align 3; .previous"); +# ifdef CONFIG_PPC_KERNEL_PCREL + asm(".section .mygot,\"a\",@nobits; .align 3; .previous"); +# endif +# endif +#else +# ifdef MODULE + asm(".section .plt,\"ax\",@nobits; .align 3; .previous"); + asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous"); +# endif /* MODULE */ +#endif + +#ifdef CONFIG_DYNAMIC_FTRACE +int module_trampoline_target(struct module *mod, unsigned long trampoline, + unsigned long *target); +int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs); +#else +static inline int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs) +{ + return 0; +} +#endif + +#endif /* __KERNEL__ */ +#endif /* _ASM_POWERPC_MODULE_H */ |