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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2012 ARM Ltd.
*/
#ifndef __ASM_MODULE_H
#define __ASM_MODULE_H
#include <asm-generic/module.h>
struct mod_plt_sec {
int plt_shndx;
int plt_num_entries;
int plt_max_entries;
};
struct mod_arch_specific {
struct mod_plt_sec core;
struct mod_plt_sec init;
/* for CONFIG_DYNAMIC_FTRACE */
struct plt_entry *ftrace_trampolines;
};
u64 module_emit_plt_entry(struct module *mod, Elf64_Shdr *sechdrs,
void *loc, const Elf64_Rela *rela,
Elf64_Sym *sym);
u64 module_emit_veneer_for_adrp(struct module *mod, Elf64_Shdr *sechdrs,
void *loc, u64 val);
struct plt_entry {
/*
* A program that conforms to the AArch64 Procedure Call Standard
* (AAPCS64) must assume that a veneer that alters IP0 (x16) and/or
* IP1 (x17) may be inserted at any branch instruction that is
* exposed to a relocation that supports long branches. Since that
* is exactly what we are dealing with here, we are free to use x16
* as a scratch register in the PLT veneers.
*/
__le32 adrp; /* adrp x16, .... */
__le32 add; /* add x16, x16, #0x.... */
__le32 br; /* br x16 */
};
static inline bool is_forbidden_offset_for_adrp(void *place)
{
return IS_ENABLED(CONFIG_ARM64_ERRATUM_843419) &&
cpus_have_const_cap(ARM64_WORKAROUND_843419) &&
((u64)place & 0xfff) >= 0xff8;
}
struct plt_entry get_plt_entry(u64 dst, void *pc);
static inline const Elf_Shdr *find_section(const Elf_Ehdr *hdr,
const Elf_Shdr *sechdrs,
const char *name)
{
const Elf_Shdr *s, *se;
const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++) {
if (strcmp(name, secstrs + s->sh_name) == 0)
return s;
}
return NULL;
}
#endif /* __ASM_MODULE_H */
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