/* 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 */
        unsigned int stub_count;        /* Number of stubs used */
#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

#ifdef CONFIG_PPC64_ELF_ABI_V1
        /* For module function descriptor dereference */
        unsigned long start_opd;
        unsigned long end_opd;
#endif
#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;
#ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE
        struct ftrace_ool_stub *ool_stubs;
        unsigned int ool_stub_count;
        unsigned int ool_stub_index;
#endif
#endif
};

/*
 * 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 */