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Implement simple if conditions

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This commit is contained in:
Eugen Wissner
2024-03-17 01:00:44 +01:00
parent 99a1ef5f96
commit 27197c7725
13 changed files with 592 additions and 33 deletions
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27
backend/target.cpp
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@ -33,13 +33,6 @@ namespace elna::riscv
// Create string table writer
ELFIO::string_section_accessor stra(str_sec);
// Create read only data section
ELFIO::section* ro_sec = writer.sections.add(".rodata");
ro_sec->set_type(ELFIO::SHT_PROGBITS);
ro_sec->set_flags(ELFIO::SHF_ALLOC);
ro_sec->set_addr_align(0x4);
ro_sec->set_data("%d\n");
// Create symbol table section
ELFIO::section* sym_sec = writer.sections.add(".symtab");
sym_sec->set_type(ELFIO::SHT_SYMTAB);
@ -57,24 +50,38 @@ namespace elna::riscv
rel_sec->set_link(sym_sec->get_index());
rel_sec->set_flags(ELFIO::SHF_ALLOC);
// Create read only data section
ELFIO::section* ro_sec = writer.sections.add(".rodata");
ro_sec->set_type(ELFIO::SHT_PROGBITS);
ro_sec->set_flags(ELFIO::SHF_ALLOC);
ro_sec->set_addr_align(0x4);
// Create symbol relocation table writers
ELFIO::symbol_section_accessor syma(writer, sym_sec);
ELFIO::relocation_section_accessor rela(writer, rel_sec);
ELFIO::Elf_Word digit_symbol = syma.add_symbol(stra, ".CL0", 0x00000000, strlen("%d\n") + 1,
ELFIO::STB_LOCAL, ELFIO::STT_NOTYPE, 0, ro_sec->get_index());
ELFIO::Elf_Word digit_symbol;
for (auto read_only_text : _visitor->read_only)
{
ro_sec->append_data(read_only_text.second.data(), read_only_text.second.size());
syma.add_symbol(stra, read_only_text.first.c_str(), 0x00000000,
read_only_text.first.size() + 1, ELFIO::STB_LOCAL, ELFIO::STT_NOTYPE, 0, ro_sec->get_index());
}
ELFIO::Elf_Word printf_symbol = syma.add_symbol(stra, "printf", 0x00000000, 0,
ELFIO::STB_GLOBAL, ELFIO::STT_NOTYPE, 0, ELFIO::SHN_UNDEF);
for (auto& reference : _visitor->references)
{
// The loop assumes that address_t::lower12i always follows address_t::high20.
switch (reference.target)
{
case address_t::high20:
digit_symbol = _visitor->read_only.lookup(reference.name) + 1;
rela.add_entry(reference.offset, digit_symbol, 26 /* ELFIO::R_RISCV_HI20 */);
rela.add_entry(reference.offset, digit_symbol, 51 /* ELFIO::R_RISCV_RELAX */);
break;
case address_t::lower12i:
digit_symbol = _visitor->read_only.lookup(reference.name) + 1;
rela.add_entry(reference.offset, digit_symbol, 27 /* ELFIO::R_RISCV_LO12_I */);
rela.add_entry(reference.offset, digit_symbol, 51 /* ELFIO::R_RISCV_RELAX */);
break;