9088f38021
LIBC_INLINE is defined in attributes.h, which was not included. Since constexpr already implies inline, simply remove the LIBC_INLINE qualifier from the static helper, matching the x86_64 and aarch64 irelative implementations.
48 lines
1.7 KiB
C++
48 lines
1.7 KiB
C++
//===-- Implementation of apply_irelative_relocs (RISC-V) -----------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "startup/linux/irelative.h"
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#include "hdr/elf_macros.h"
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#include "hdr/elf_proxy.h"
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#include "hdr/link_macros.h"
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#include "src/__support/macros/config.h"
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namespace LIBC_NAMESPACE_DECL {
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// RISC-V may be 32-bit or 64-bit. ElfW(Rela) handles the struct type,
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// but we need the correct R_TYPE extraction macro.
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static constexpr unsigned get_r_type(uintptr_t info) {
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#ifdef __LP64__
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return ELF64_R_TYPE(info);
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#else
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return ELF32_R_TYPE(info);
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#endif
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}
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void apply_irelative_relocs(intptr_t base, unsigned long /*hwcap*/,
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unsigned long /*hwcap2*/) {
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for (const ElfW(Rela) *rela = __rela_iplt_start; rela != __rela_iplt_end;
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++rela) {
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if (get_r_type(rela->r_info) != R_RISCV_IRELATIVE)
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continue;
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// RISC-V resolvers take no arguments (same as x86_64).
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// Use unsigned arithmetic to avoid undefined behavior on signed overflow,
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// which can occur with very large binaries or high load addresses.
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uintptr_t resolver_addr =
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static_cast<uintptr_t>(base) + static_cast<uintptr_t>(rela->r_addend);
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auto resolver = reinterpret_cast<uintptr_t (*)(void)>(resolver_addr);
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uintptr_t result = resolver();
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uintptr_t target_addr = static_cast<uintptr_t>(base) + rela->r_offset;
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*reinterpret_cast<uintptr_t *>(target_addr) = result;
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}
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}
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} // namespace LIBC_NAMESPACE_DECL
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