projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 42ac26f2 RC |
1 | /* |
| 2 | * Copyright (C) 2017 Andes Technology | |
| 3 | * Chih-Mao Chen <cmchen@andestech.com> | |
| 4 | * | |
| 5 | * SPDX-License-Identifier: GPL-2.0+ | |
| 6 | * | |
| 7 | * Statically process runtime relocations on RISC-V ELF images | |
| 8 | * so that it can be directly executed when loaded at LMA | |
| 9 | * without fixup. Both RV32 and RV64 are supported. | |
| 10 | */ | |
| 11 | ||
| 12 | #define CONCAT_IMPL(x, y) x##y | |
| 13 | #define CONCAT(x, y) CONCAT_IMPL(x, y) | |
| 14 | #define CONCAT3(x, y, z) CONCAT(CONCAT(x, y), z) | |
| 15 | ||
| 16 | #define prelink_nn CONCAT(prelink, PRELINK_INC_BITS) | |
| 17 | #define uintnn_t CONCAT3(uint, PRELINK_INC_BITS, _t) | |
| 18 | #define get_offset_nn CONCAT(get_offset_, PRELINK_INC_BITS) | |
| 19 | #define Elf_Ehdr CONCAT3(Elf, PRELINK_INC_BITS, _Ehdr) | |
| 20 | #define Elf_Phdr CONCAT3(Elf, PRELINK_INC_BITS, _Phdr) | |
| 21 | #define Elf_Rela CONCAT3(Elf, PRELINK_INC_BITS, _Rela) | |
| 22 | #define Elf_Sym CONCAT3(Elf, PRELINK_INC_BITS, _Sym) | |
| 23 | #define Elf_Dyn CONCAT3(Elf, PRELINK_INC_BITS, _Dyn) | |
| 24 | #define Elf_Addr CONCAT3(Elf, PRELINK_INC_BITS, _Addr) | |
| 25 | #define ELF_R_TYPE CONCAT3(ELF, PRELINK_INC_BITS, _R_TYPE) | |
| 26 | #define ELF_R_SYM CONCAT3(ELF, PRELINK_INC_BITS, _R_SYM) | |
| 27 | ||
| 28 | static void* get_offset_nn (void* data, Elf_Phdr* phdrs, size_t phnum, Elf_Addr addr) | |
| 29 | { | |
| 30 | Elf_Phdr *p; | |
| 31 | ||
| 32 | for (p = phdrs; p < phdrs + phnum; ++p) | |
| 33 | if (p->p_vaddr <= addr && p->p_vaddr + p->p_memsz > addr) | |
| 34 | return data + p->p_offset + (addr - p->p_vaddr); | |
| 35 | ||
| 36 | return NULL; | |
| 37 | } | |
| 38 | ||
| 39 | static void prelink_nn(void *data) | |
| 40 | { | |
| 41 | Elf_Ehdr *ehdr = data; | |
| 42 | Elf_Phdr *p; | |
| 43 | Elf_Dyn *dyn; | |
| 44 | Elf_Rela *r; | |
| 45 | ||
| 46 | if (ehdr->e_machine != EM_RISCV) | |
| 47 | die("Machine type is not RISC-V"); | |
| 48 | ||
| 49 | Elf_Phdr *phdrs = data + ehdr->e_phoff; | |
| 50 | ||
| 51 | Elf_Dyn *dyns = NULL; | |
| 52 | for (p = phdrs; p < phdrs + ehdr->e_phnum; ++p) { | |
| 53 | if (p->p_type == PT_DYNAMIC) { | |
| 54 | dyns = data + p->p_offset; | |
| 55 | break; | |
| 56 | } | |
| 57 | } | |
| 58 | ||
| 59 | if (dyns == NULL) | |
| 60 | die("No dynamic section found"); | |
| 61 | ||
| 62 | Elf_Rela *rela_dyn = NULL; | |
| 63 | size_t rela_count = 0; | |
| 64 | Elf_Sym *dynsym = NULL; | |
| 65 | for (dyn = dyns;; ++dyn) { | |
| 66 | if (dyn->d_tag == DT_NULL) | |
| 67 | break; | |
| 68 | else if (dyn->d_tag == DT_RELA) | |
| 69 | rela_dyn = get_offset_nn(data, phdrs, ehdr->e_phnum, + dyn->d_un.d_ptr); | |
| 70 | else if (dyn->d_tag == DT_RELASZ) | |
| 71 | rela_count = dyn->d_un.d_val / sizeof(Elf_Rela); | |
| 72 | else if (dyn->d_tag == DT_SYMTAB) | |
| 73 | dynsym = get_offset_nn(data, phdrs, ehdr->e_phnum, + dyn->d_un.d_ptr); | |
| 74 | ||
| 75 | } | |
| 76 | ||
| 77 | if (rela_dyn == NULL) | |
| 78 | die("No .rela.dyn found"); | |
| 79 | ||
| 80 | if (dynsym == NULL) | |
| 81 | die("No .dynsym found"); | |
| 82 | ||
| 83 | for (r = rela_dyn; r < rela_dyn + rela_count; ++r) { | |
| 84 | void* buf = get_offset_nn(data, phdrs, ehdr->e_phnum, r->r_offset); | |
| 85 | ||
| 86 | if (buf == NULL) | |
| 87 | continue; | |
| 88 | ||
| 89 | if (ELF_R_TYPE(r->r_info) == R_RISCV_RELATIVE) | |
| 90 | *((uintnn_t*) buf) = r->r_addend; | |
| 91 | else if (ELF_R_TYPE(r->r_info) == R_RISCV_32) | |
| 92 | *((uint32_t*) buf) = dynsym[ELF_R_SYM(r->r_info)].st_value; | |
| 93 | else if (ELF_R_TYPE(r->r_info) == R_RISCV_64) | |
| 94 | *((uint64_t*) buf) = dynsym[ELF_R_SYM(r->r_info)].st_value; | |
| 95 | } | |
| 96 | } | |
| 97 | ||
| 98 | #undef prelink_nn | |
| 99 | #undef uintnn_t | |
| 100 | #undef get_offset_nn | |
| 101 | #undef Elf_Ehdr | |
| 102 | #undef Elf_Phdr | |
| 103 | #undef Elf_Rela | |
| 104 | #undef Elf_Sym | |
| 105 | #undef Elf_Dyn | |
| 106 | #undef Elf_Addr | |
| 107 | #undef ELF_R_TYPE | |
| 108 | #undef ELF_R_SYM | |
| 109 | ||
| 110 | #undef CONCAT_IMPL | |
| 111 | #undef CONCAT | |
| 112 | #undef CONCAT3 |