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LibELF: Add initial RISC-V support
This is an almost-minimal patchset to get RISC-V ELF files to pass validation. Unlike other architectures, eflags are actually used here.
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2 changed files with 29 additions and 5 deletions
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@ -59,8 +59,8 @@ bool validate_elf_header(ElfW(Ehdr) const& elf_header, size_t file_size, bool ve
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return false;
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}
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auto expected_machines = Array { EM_X86_64, EM_AARCH64 };
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auto expected_machine_names = Array { "x86-64"sv, "aarch64"sv };
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auto expected_machines = Array { EM_X86_64, EM_AARCH64, EM_RISCV };
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auto expected_machine_names = Array { "x86-64"sv, "aarch64"sv, "riscv64"sv };
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if (!expected_machines.span().contains_slow(elf_header.e_machine)) {
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if (verbose)
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@ -117,9 +117,21 @@ bool validate_elf_header(ElfW(Ehdr) const& elf_header, size_t file_size, bool ve
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}
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if (0 != elf_header.e_flags) {
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if (verbose)
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dbgln("File has incorrect ELF header flags...? ({}), expected ({}).", elf_header.e_flags, 0);
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return false;
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// TODO: Refuse to run C ABI binaries on system without the C extension.
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// TODO: Refuse to run TSO ABI binaries on system without the Ztso extension.
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if (elf_header.e_machine == EM_RISCV) {
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auto float_abi = elf_header.e_flags & EF_RISCV_FLOAT_ABI;
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// TODO: Support 32-bit hardware float ABI somehow?
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if (float_abi != EF_RISCV_FLOAT_ABI_DOUBLE) {
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if (verbose)
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dbgln("File has unsupported float ABI ({}), only double ({}) is supported.", float_abi, EF_RISCV_FLOAT_ABI_DOUBLE);
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return false;
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}
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} else {
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if (verbose)
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dbgln("File has incorrect ELF header flags...? ({}), expected ({}).", elf_header.e_flags, 0);
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return false;
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}
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}
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if (0 != elf_header.e_phnum && sizeof(ElfW(Phdr)) != elf_header.e_phentsize) {
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