mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
112 lines
3.0 KiB
C++
112 lines
3.0 KiB
C++
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 Andes Technology
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* Chih-Mao Chen <cmchen@andestech.com>
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*
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* Statically process runtime relocations on RISC-V ELF images
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* so that it can be directly executed when loaded at LMA
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* without fixup. Both RV32 and RV64 are supported.
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*/
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#define CONCAT_IMPL(x, y) x##y
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#define CONCAT(x, y) CONCAT_IMPL(x, y)
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#define CONCAT3(x, y, z) CONCAT(CONCAT(x, y), z)
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#define prelink_nn CONCAT(prelink, PRELINK_INC_BITS)
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#define uintnn_t CONCAT3(uint, PRELINK_INC_BITS, _t)
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#define get_offset_nn CONCAT(get_offset_, PRELINK_INC_BITS)
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#define Elf_Ehdr CONCAT3(Elf, PRELINK_INC_BITS, _Ehdr)
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#define Elf_Phdr CONCAT3(Elf, PRELINK_INC_BITS, _Phdr)
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#define Elf_Rela CONCAT3(Elf, PRELINK_INC_BITS, _Rela)
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#define Elf_Sym CONCAT3(Elf, PRELINK_INC_BITS, _Sym)
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#define Elf_Dyn CONCAT3(Elf, PRELINK_INC_BITS, _Dyn)
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#define Elf_Addr CONCAT3(Elf, PRELINK_INC_BITS, _Addr)
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#define ELF_R_TYPE CONCAT3(ELF, PRELINK_INC_BITS, _R_TYPE)
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#define ELF_R_SYM CONCAT3(ELF, PRELINK_INC_BITS, _R_SYM)
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static void* get_offset_nn (void* data, Elf_Phdr* phdrs, size_t phnum, Elf_Addr addr)
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{
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Elf_Phdr *p;
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for (p = phdrs; p < phdrs + phnum; ++p)
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if (p->p_vaddr <= addr && p->p_vaddr + p->p_memsz > addr)
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return data + p->p_offset + (addr - p->p_vaddr);
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return NULL;
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}
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static void prelink_nn(void *data)
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{
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Elf_Ehdr *ehdr = data;
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Elf_Phdr *p;
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Elf_Dyn *dyn;
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Elf_Rela *r;
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if (ehdr->e_machine != EM_RISCV)
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die("Machine type is not RISC-V");
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Elf_Phdr *phdrs = data + ehdr->e_phoff;
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Elf_Dyn *dyns = NULL;
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for (p = phdrs; p < phdrs + ehdr->e_phnum; ++p) {
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if (p->p_type == PT_DYNAMIC) {
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dyns = data + p->p_offset;
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break;
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}
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}
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if (dyns == NULL)
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die("No dynamic section found");
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Elf_Rela *rela_dyn = NULL;
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size_t rela_count = 0;
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Elf_Sym *dynsym = NULL;
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for (dyn = dyns;; ++dyn) {
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if (dyn->d_tag == DT_NULL)
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break;
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else if (dyn->d_tag == DT_RELA)
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rela_dyn = get_offset_nn(data, phdrs, ehdr->e_phnum, + dyn->d_un.d_ptr);
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else if (dyn->d_tag == DT_RELASZ)
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rela_count = dyn->d_un.d_val / sizeof(Elf_Rela);
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else if (dyn->d_tag == DT_SYMTAB)
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dynsym = get_offset_nn(data, phdrs, ehdr->e_phnum, + dyn->d_un.d_ptr);
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}
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if (rela_dyn == NULL)
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die("No .rela.dyn found");
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if (dynsym == NULL)
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die("No .dynsym found");
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for (r = rela_dyn; r < rela_dyn + rela_count; ++r) {
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void* buf = get_offset_nn(data, phdrs, ehdr->e_phnum, r->r_offset);
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if (buf == NULL)
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continue;
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if (ELF_R_TYPE(r->r_info) == R_RISCV_RELATIVE)
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*((uintnn_t*) buf) = r->r_addend;
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else if (ELF_R_TYPE(r->r_info) == R_RISCV_32)
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*((uint32_t*) buf) = dynsym[ELF_R_SYM(r->r_info)].st_value;
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else if (ELF_R_TYPE(r->r_info) == R_RISCV_64)
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*((uint64_t*) buf) = dynsym[ELF_R_SYM(r->r_info)].st_value;
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}
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}
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#undef prelink_nn
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#undef uintnn_t
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#undef get_offset_nn
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#undef Elf_Ehdr
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#undef Elf_Phdr
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#undef Elf_Rela
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#undef Elf_Sym
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#undef Elf_Dyn
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#undef Elf_Addr
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#undef ELF_R_TYPE
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#undef ELF_R_SYM
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#undef CONCAT_IMPL
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#undef CONCAT
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#undef CONCAT3
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