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Asem-ELFHolder.cpp
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Asem-ELFHolder.cpp
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#include "Asem-ELFHolder.hpp"
#include "Asem-Enumeration.hpp"
#include "Assembler.hpp"
#include "Asem-Func.hpp"
#include "Asem-FuncEH.hpp"
#include "StringUtil.hpp"
#include <cstring>
#include <iostream>
#define UCHAR unsigned char
namespace asem {
void BinaryVector::addByte(unsigned char val) {
data.push_back(val);
}
void BinaryVector::addWord(unsigned short val) {
UCHAR arr[2];
std::memcpy(arr, &val, 2);
data.push_back( arr[0] );
data.push_back( arr[1] );
}
void BinaryVector::addLong(unsigned int val) {
UCHAR arr[4];
std::memcpy(arr, &val, 4);
data.push_back( arr[0] );
data.push_back( arr[1] );
data.push_back( arr[2] );
data.push_back( arr[3] );
}
////////////////////////////////////////////////////////////////////////////
void ELFHolder::clear() {
for (size_t i = 0; i < 4; i += 1) {
relocations[i].clear();
sections[i].data.clear();
skip[0] = 0u;
}
curr_section = Section::Undefined;
}
void ELFHolder::loadFromAssemblyList(const AssemblyList & al) {
clear();
const SymbolTable & st = al.symtab;
for (const LineOfCode & loc : al.data) {
switch (loc.command) {
// Directives:
case Command::Global: /* Do nothing */ break;
case Command::Text: ElfHldProcSect(*this, Section::Text); break;
case Command::Data: ElfHldProcSect(*this, Section::Data); break;
case Command::ROData: ElfHldProcSect(*this, Section::ROData); break;
case Command::BSS: ElfHldProcSect(*this, Section::BSS); break;
case Command::End: /* Do nothing */ break;
case Command::Char: ElfHldProcChar(*this, st, loc); break;
case Command::Word: ElfHldProcWord(*this, st, loc); break;
case Command::Long: ElfHldProcLong(*this, st, loc); break;
case Command::Align: ElfHldProcAlign(*this, st, loc);break;
case Command::Skip: ElfHldProcSkip(*this, st, loc); break;
// Instructions:
case Command::Add:
case Command::Sub:
case Command::Mul:
case Command::Div:
case Command::Cmp:
case Command::And:
case Command::Or:
case Command::Not:
case Command::Test:
case Command::Mov:
case Command::Shl:
case Command::Shr:
case Command::Push:
case Command::Pop:
case Command::Call:
case Command::Iret:
case Command::RetP:
case Command::JmpP: ElfHldProcInstr(*this, st, loc); break;
}
}
}
std::string ELFHolder::rrToString(Section::Enum sec) const {
if (relocations[sec].empty()) return "";
std::string rv{"#.ret"};
switch (sec) {
case Section::Text: rv += ".text\n"; break;
case Section::Data: rv += ".data\n"; break;
case Section::BSS: rv += ".bss\n"; break;
case Section::ROData: rv += ".rodata\n"; break;
}
char buffer[128];
snprintf( buffer, sizeof(buffer)
, "%-9s %-10s %6s\n"
, "#Offset"
, "Type"
, "SymOrd"
) ;
rv += buffer;
for (const RelocRecord & rr : relocations[sec]) {
snprintf( buffer, sizeof(buffer)
, "0x%07X %-10s 0x%04X\n"
, (int)rr.offset
, RelocTypeToString(rr.type)
, (int)rr.value
) ;
rv += buffer;
}
rv.pop_back();
return rv;
}
std::string ELFHolder::secToString(Section::Enum sec) const {
if (sections[sec].data.empty()) return "";
std::string rv{"#"};
switch (sec) {
case Section::Text: rv += ".text\n"; break;
case Section::Data: rv += ".data\n"; break;
case Section::BSS: rv += ".bss\n"; break;
case Section::ROData: rv += ".rodata\n"; break;
}
rv += gen::buffer_to_hex( §ions[sec].data[0]
, sections[sec].data.size() // sizeof(data[0]) = 1
, ' '
) ;
return rv;
}
void ELFHolder::clearBSS() {
relocations[Section::BSS].clear();
size_t len = sections[Section::BSS].data.size();
std::memset( &(sections[Section::BSS].data[0]), 0, len);
}
}
#undef UCHAR