3466dab804
The RISC-V port of llext requires additional parameters for handling non-adjacent HI20/LO12 relocations in arch_elf_relocate(): the current extension (struct llext), the current extension loader (struct llext_loader), the current section header (elf_shdr_t) and the current symbol (elf_sym_t). This changes the signature of arch_elf_relocate accordingly. Signed-off-by: Eric Ackermann <eric.ackermann@cispa.de>
102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/*
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* Copyright (c) 2024 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/llext/elf.h>
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#include <zephyr/llext/llext.h>
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#include <zephyr/llext/llext_internal.h>
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#include <zephyr/llext/loader.h>
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#include <zephyr/logging/log.h>
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#include <zephyr/sys/util.h>
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LOG_MODULE_REGISTER(elf, CONFIG_LLEXT_LOG_LEVEL);
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#define R_ARC_32 4
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#define R_ARC_B26 5 /* AKA R_ARC_64 */
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#define R_ARC_S25W_PCREL 17
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#define R_ARC_32_ME 27
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/* ARCompact insns packed in memory have Middle Endian encoding */
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#define ME(x) (((x & 0xffff0000) >> 16) | ((x & 0xffff) << 16))
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/**
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* @brief Architecture specific function for relocating shared elf
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*
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* Elf files contain a series of relocations described in multiple sections.
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* These relocation instructions are architecture specific and each architecture
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* supporting modules must implement this.
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*
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* The relocation codes are well documented:
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* https://github.com/foss-for-synopsys-dwc-arc-processors/arc-ABI-manual/blob/master/ARCv2_ABI.pdf
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* https://github.com/zephyrproject-rtos/binutils-gdb
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*/
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int arch_elf_relocate(struct llext_loader *ldr, struct llext *ext, elf_rela_t *rel,
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const elf_shdr_t *shdr)
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{
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int ret = 0;
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uint32_t value;
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const uintptr_t loc = llext_get_reloc_instruction_location(ldr, ext, shdr->sh_info, rel);
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uint32_t insn = UNALIGNED_GET((uint32_t *)loc);
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elf_sym_t sym;
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uintptr_t sym_base_addr;
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const char *sym_name;
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ret = llext_read_symbol(ldr, ext, rel, &sym);
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if (ret != 0) {
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LOG_ERR("Could not read symbol from binary!");
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return ret;
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}
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sym_name = llext_symbol_name(ldr, ext, &sym);
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ret = llext_lookup_symbol(ldr, ext, &sym_base_addr, rel, &sym, sym_name, shdr);
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if (ret != 0) {
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LOG_ERR("Could not find symbol %s!", sym_name);
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return ret;
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}
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sym_base_addr += rel->r_addend;
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int reloc_type = ELF32_R_TYPE(rel->r_info);
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switch (reloc_type) {
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case R_ARC_32:
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case R_ARC_B26:
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UNALIGNED_PUT(sym_base_addr, (uint32_t *)loc);
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break;
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case R_ARC_S25W_PCREL:
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/* ((S + A) - P) >> 2
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* S = symbol address
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* A = addend
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* P = relative offset to PCL
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*/
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value = (sym_base_addr + rel->r_addend - (loc & ~0x3)) >> 2;
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insn = ME(insn);
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/* disp25w */
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insn = insn & ~0x7fcffcf;
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insn |= ((value >> 0) & 0x01ff) << 18;
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insn |= ((value >> 9) & 0x03ff) << 6;
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insn |= ((value >> 19) & 0x000f) << 0;
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insn = ME(insn);
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UNALIGNED_PUT(insn, (uint32_t *)loc);
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break;
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case R_ARC_32_ME:
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UNALIGNED_PUT(ME(sym_base_addr), (uint32_t *)loc);
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break;
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default:
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LOG_ERR("unknown relocation: %u\n", reloc_type);
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ret = -ENOEXEC;
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break;
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}
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return ret;
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}
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