59b3d4a9b0
GCC >= 13 and GNU assembler >= 2.40 use these relocations to address external symbols, so we need to add them. Let the module loader emit GOT entries for data symbols so we would be able to handle GOT relocations. The GOT entry is just the data's symbol address. In module.lds, emit a stub .got section for a section header entry. The actual content of the section entry will be filled at runtime by module_ frob_arch_sections(). Tested-by: WANG Xuerui <git@xen0n.name> Signed-off-by: Xi Ruoyao <xry111@xry111.site> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_MODULE_H
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#define _ASM_MODULE_H
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#include <asm/inst.h>
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#include <asm-generic/module.h>
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#define RELA_STACK_DEPTH 16
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struct mod_section {
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Elf_Shdr *shdr;
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int num_entries;
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int max_entries;
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};
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struct mod_arch_specific {
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struct mod_section got;
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struct mod_section plt;
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struct mod_section plt_idx;
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};
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struct got_entry {
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Elf_Addr symbol_addr;
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};
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struct plt_entry {
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u32 inst_lu12iw;
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u32 inst_lu32id;
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u32 inst_lu52id;
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u32 inst_jirl;
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};
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struct plt_idx_entry {
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Elf_Addr symbol_addr;
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};
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Elf_Addr module_emit_got_entry(struct module *mod, Elf_Addr val);
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Elf_Addr module_emit_plt_entry(struct module *mod, Elf_Addr val);
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static inline struct got_entry emit_got_entry(Elf_Addr val)
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{
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return (struct got_entry) { val };
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}
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static inline struct plt_entry emit_plt_entry(unsigned long val)
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{
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u32 lu12iw, lu32id, lu52id, jirl;
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lu12iw = (lu12iw_op << 25 | (((val >> 12) & 0xfffff) << 5) | LOONGARCH_GPR_T1);
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lu32id = larch_insn_gen_lu32id(LOONGARCH_GPR_T1, ADDR_IMM(val, LU32ID));
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lu52id = larch_insn_gen_lu52id(LOONGARCH_GPR_T1, LOONGARCH_GPR_T1, ADDR_IMM(val, LU52ID));
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jirl = larch_insn_gen_jirl(0, LOONGARCH_GPR_T1, 0, (val & 0xfff));
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return (struct plt_entry) { lu12iw, lu32id, lu52id, jirl };
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}
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static inline struct plt_idx_entry emit_plt_idx_entry(unsigned long val)
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{
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return (struct plt_idx_entry) { val };
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}
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static inline int get_plt_idx(unsigned long val, const struct mod_section *sec)
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{
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int i;
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struct plt_idx_entry *plt_idx = (struct plt_idx_entry *)sec->shdr->sh_addr;
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for (i = 0; i < sec->num_entries; i++) {
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if (plt_idx[i].symbol_addr == val)
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return i;
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}
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return -1;
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}
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static inline struct plt_entry *get_plt_entry(unsigned long val,
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const struct mod_section *sec_plt,
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const struct mod_section *sec_plt_idx)
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{
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int plt_idx = get_plt_idx(val, sec_plt_idx);
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struct plt_entry *plt = (struct plt_entry *)sec_plt->shdr->sh_addr;
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if (plt_idx < 0)
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return NULL;
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return plt + plt_idx;
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}
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static inline struct got_entry *get_got_entry(Elf_Addr val,
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const struct mod_section *sec)
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{
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struct got_entry *got = (struct got_entry *)sec->shdr->sh_addr;
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int i;
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for (i = 0; i < sec->num_entries; i++)
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if (got[i].symbol_addr == val)
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return &got[i];
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return NULL;
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}
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#endif /* _ASM_MODULE_H */
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