mirror of
https://github.com/ksherlock/merlin-utils.git
synced 2024-10-03 23:54:29 +00:00
922 lines
19 KiB
C++
922 lines
19 KiB
C++
/* c++17 */
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#include <algorithm>
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#include <string>
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#include <string_view>
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#include <system_error>
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#include <unordered_map>
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#include <utility>
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#include <vector>
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#include <cassert>
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#include <cerrno>
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#include <cstdint>
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#include <cstdio>
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#include <cstring>
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#include <ctime>
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#include <err.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include <afp/finder_info.h>
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#include "mapped_file.h"
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#include "omf.h"
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#include "rel.h"
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#include "link.h"
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#include "script.h"
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void save_omf(const std::string &path, std::vector<omf::segment> &segments, bool compress, bool expressload);
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int set_file_type(const std::string &path, uint16_t file_type, uint32_t aux_type, std::error_code &ec);
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void set_file_type(const std::string &path, uint16_t file_type, uint32_t aux_type);
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/* since span isn't standard yet */
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typedef std::basic_string_view<uint8_t> byte_view;
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struct pending_reloc : public omf::reloc {
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unsigned id = 0;
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};
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struct cookie {
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std::string file;
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std::vector<unsigned> remap;
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uint32_t begin = 0;
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uint32_t end = 0;
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};
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namespace {
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std::unordered_map<std::string, unsigned> symbol_map;
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std::vector<symbol> symbol_table;
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std::vector<omf::segment> segments;
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std::vector<std::vector<pending_reloc>> relocations;
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std::unordered_map<std::string, uint32_t> file_types = {
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{ "NON", 0x00 },
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{ "BAD", 0x01 },
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{ "BIN", 0x06 },
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{ "TXT", 0x04 },
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{ "DIR", 0x0f },
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{ "ADB", 0x19 },
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{ "AWP", 0x1a },
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{ "ASP", 0x1b },
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{ "GSB", 0xab },
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{ "TDF", 0xac },
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{ "BDF", 0xad },
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{ "SRC", 0xb0 },
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{ "OBJ", 0xb1 },
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{ "LIB", 0xb2 },
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{ "S16", 0xb3 },
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{ "RTL", 0xb4 },
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{ "EXE", 0xb5 },
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{ "PIF", 0xb6 },
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{ "TIF", 0xb7 },
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{ "NDA", 0xb8 },
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{ "CDA", 0xb9 },
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{ "TOL", 0xba },
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{ "DRV", 0xbb },
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{ "DOC", 0xbf },
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{ "PNT", 0xc0 },
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{ "PIC", 0xc1 },
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{ "FON", 0xcb },
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{ "PAS", 0xef },
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{ "CMD", 0xf0 },
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{ "LNK", 0xf8 },
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{ "BAS", 0xfc },
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{ "VAR", 0xfd },
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{ "REL", 0xfe },
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{ "SYS", 0xff },
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};
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}
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/*
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Variable types:
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linker symbol table includes =, EQU, GEQ, and KBD
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GEQ - global absolute label, in effect for all subsequent asms.
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inhibits KBD, otherwise causes duplicate symbol errors during assembly.
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KBD - same as GEQ
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EQU - same as GEQ BUT symbol is discarded after ASM (ie, only in effect for 1 assembly)
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= - internal to link script (DO, etc). not passed to assembler. not passed to linker.
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POS - current offset
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LEN - length of last linked file
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a = assembler
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l = linker
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c = command file
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a l c
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EQU y n n
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= n n y
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GEQ y y y
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KBD y y y
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POS n y n
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LEN n y n
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seems like it might be nice for POS and LEN to be available in the command file, eg
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POS xxx
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DO xxx>4096
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ERR too big
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ELS
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DS 4096-xxx
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FIN
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*/
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namespace {
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/* script related */
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unsigned lkv = 1;
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unsigned ver = 2;
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unsigned ftype = 0xb3;
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unsigned atype = 0x0000;
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unsigned kind = 0x0000;
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unsigned sav = 0;
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bool end = false;
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bool fas = false;
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int ovr = OVR_OFF;
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size_t pos_offset = 0;
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size_t len_offset = 0;
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/* do/els/fin stuff */
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uint32_t active_bits = 1;
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bool active = true;
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std::unordered_map<std::string, uint32_t> local_symbol_table;
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}
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/* nb - pointer may be invalidated by next call */
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symbol *find_symbol(const std::string &name, bool insert) {
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auto iter = symbol_map.find(name);
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if (iter != symbol_map.end()) return &symbol_table[iter->second];
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if (!insert) return nullptr;
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unsigned id = symbol_table.size();
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symbol_map.emplace(name, id);
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auto &rv = symbol_table.emplace_back();
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rv.name = name;
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rv.id = id;
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return &rv;
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}
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void define(std::string name, uint32_t value, int type) {
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bool warn = false;
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if (type & 4) {
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/* command script */
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auto iter = local_symbol_table.find(name);
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if (iter == local_symbol_table.end()) {
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local_symbol_table.emplace(std::make_pair(name, value));
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} else if (iter->second != value) {
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warn = true;
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}
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}
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if (type & 2) {
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/* linker */
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auto e = find_symbol(name, true);
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if (e->defined) {
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if (!e->absolute || e->value != value) {
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warn = true;
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}
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} else {
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e->absolute = true;
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e->defined = true;
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e->file = "-D";
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e->value = value;
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}
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}
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if (warn) warnx("duplicate symbol %s", name.c_str());
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}
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static void process_labels(byte_view &data, cookie &cookie) {
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for(;;) {
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assert(data.size());
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unsigned flag = data[0];
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if (flag == 0x00) return;
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unsigned length = flag & 0x1f;
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assert(length != 0);
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assert(data.size() >= length + 4);
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std::string name(data.data() + 1, data.data() + 1 + length);
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data.remove_prefix(1 + length);
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uint32_t value = data[0] | (data[1] << 8) | (data[2] << 16);
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data.remove_prefix(3);
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symbol *e = find_symbol(name);
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switch (flag & ~0x1f) {
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case SYMBOL_EXTERNAL:
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/* map the unit symbol # to a global symbol # */
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value &= 0x7fff;
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if (cookie.remap.size() < value + 1)
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cookie.remap.resize(value + 1);
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cookie.remap[value] = e->id;
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break;
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case SYMBOL_ENTRY+SYMBOL_ABSOLUTE:
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if (e->defined && e->absolute && e->value == value)
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break; /* allow redef */
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case SYMBOL_ENTRY:
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if (e->defined) {
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warnx("%s previously defined (%s)", e->name.c_str(), e->file.c_str());
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break;
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}
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e->defined = true;
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e->file = cookie.file;
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e->segment = segments.size() - 1; /* 1-based */
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if (flag & SYMBOL_ABSOLUTE) {
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e->absolute = true;
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e->value = value;
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} else {
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e->absolute = false;
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e->value = value - 0x8000 + cookie.begin;
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}
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break;
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default:
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errx(1, "%s: Unsupported flag: %02x\n", cookie.file.c_str(), flag);
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break;
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}
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}
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}
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static void process_reloc(byte_view &data, cookie &cookie) {
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auto &seg = segments.back();
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auto &pending = relocations.back();
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for(;;) {
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assert(data.size());
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unsigned flag = data[0];
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if (flag == 0x00) return;
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assert(data.size() >= 4);
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uint32_t offset = data[1] | (data[2] << 8);
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unsigned x = data[3];
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data.remove_prefix(4);
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offset += cookie.begin;
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bool external = false;
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unsigned shift = 0;
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uint32_t value = 0;
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unsigned size = 0;
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if (flag == 0xff) {
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/* shift */
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assert(data.size() >= 4);
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unsigned flag = data[0];
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value = data[1] | (data[2] << 8) | (data[3] << 16);
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value -= 0x8000;
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external = flag & 0x04;
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switch(flag & ~0x04) {
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case 0xd0:
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shift = -16;
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size = 1;
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break;
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case 0xd1:
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shift = -8;
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size = 2;
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break;
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case 0xd3:
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shift = -8;
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size = 1;
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break;
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default: /* bad */
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errx(1, "%s: Unsupported flag: %02x\n", cookie.file.c_str(), flag);
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break;
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}
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data.remove_prefix(4);
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} else {
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assert((flag & ~(0x0f|0x10|0x20|0x80)) == 0);
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// offset already adjusted by start so below comparisons are wrong.
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switch(flag & (0x80 + 0x20)) {
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case 0:
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size = 1;
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assert(offset + 0 < cookie.end);
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break;
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case 0x20:
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size = 3;
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assert(offset + 2 < cookie.end);
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break;
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case 0x80:
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size = 2;
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assert(offset + 1 < cookie.end);
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break;
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default: /* bad size */
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errx(1, "%s: Unsupported flag: %02x\n", cookie.file.c_str(), flag);
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break;
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}
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external = flag & 0x10;
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switch(size) {
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case 3: value |= seg.data[offset+2] << 16;
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case 2: value |= seg.data[offset+1] << 8;
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case 1: value |= seg.data[offset+0];
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}
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if (size > 1) value -= 0x8000;
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}
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/* external resolutions are deferred for later */
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if (external) {
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/* x = local symbol # */
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pending_reloc r;
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assert(x < cookie.remap.size());
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r.id = cookie.remap[x];
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r.size = size;
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r.offset = offset;
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r.value = value;
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r.shift = shift;
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symbol_table[r.id].count += 1;
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pending.emplace_back(r);
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} else {
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omf::reloc r;
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r.size = size;
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r.offset = offset;
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r.value = value + cookie.begin;
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r.shift = shift;
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seg.relocs.emplace_back(r);
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}
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/* clear out the inline relocation data */
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for (unsigned i = 0; i < size; ++i) {
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seg.data[offset + i] = 0;
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}
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//cookie.zero.emplace_back(std::make_pair(offset, size));
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}
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}
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static void process_unit(const std::string &path) {
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cookie cookie;
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/* skip over relocs, do symbols first */
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std::error_code ec;
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mapped_file mf(path, mapped_file::readonly, ec);
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if (ec) {
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errx(1, "Unable to open %s: %s", path.c_str(), ec.message().c_str());
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}
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afp::finder_info fi;
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fi.read(path, ec);
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if (ec) {
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errx(1, "Error reading filetype %s: %s", path.c_str(), ec.message().c_str());
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}
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if (fi.prodos_file_type() != 0xf8) {
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errx(1, "Wrong file type: %s", path.c_str());
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}
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uint32_t offset = fi.prodos_aux_type();
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if (offset+2 > mf.size()) {
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errx(1, "Invalid aux type %s", path.c_str());
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}
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auto &seg = segments.back();
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cookie.begin = seg.data.size();
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cookie.end = cookie.begin + offset;
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cookie.file = path;
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seg.data.insert(seg.data.end(), mf.data(), mf.data() + offset);
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byte_view data(mf.data() + offset, mf.size() - offset);
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byte_view rr = data;
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/* skip over the relocation records so we can process the labels first. */
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/* this is so external references can use the global symbol id */
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assert(data.size() >= 2);
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for(;;) {
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if (data[0] == 0) break;
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assert(data.size() >= 6);
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data.remove_prefix(4);
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}
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data.remove_prefix(1);
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process_labels(data, cookie);
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assert(data.size() == 1);
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/* now relocations */
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process_reloc(rr, cookie);
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// LEN support
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len_offset = offset;
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}
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static void resolve(void) {
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for (unsigned seg_num = 0; seg_num < segments.size(); ++seg_num) {
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auto &seg = segments[seg_num];
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auto &pending = relocations[seg_num];
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seg.segnum = seg_num + 1;
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for (auto &r : pending) {
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assert(r.id < symbol_map.size());
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const auto &e = symbol_table[r.id];
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/* if this is an absolute value, do the math */
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if (!e.defined) {
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warnx("%s is not defined", e.name.c_str());
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continue;
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}
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if (e.absolute) {
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uint32_t value = e.value + r.value;
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/* shift is a uint8_t so negating doesn't work right */
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value >>= -(int8_t)r.shift;
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unsigned offset = r.offset;
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unsigned size = r.size;
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while (size--) {
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seg.data[offset++] = value & 0xff;
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value >>= 8;
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}
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continue;
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}
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/* e.segment is 0-based */
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if (e.segment == seg_num) {
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r.value += e.value;
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seg.relocs.emplace_back(r);
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continue;
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}
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omf::interseg inter;
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inter.size = r.size;
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inter.shift = r.shift;
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inter.offset = r.offset;
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inter.segment = e.segment + 1; /* 1-based */
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inter.segment_offset = r.value + e.value;
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seg.intersegs.emplace_back(inter);
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}
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pending.clear();
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/* sort them */
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std::sort(seg.relocs.begin(), seg.relocs.end(), [](const auto &a, const auto &b){
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return a.offset < b.offset;
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});
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std::sort(seg.intersegs.begin(), seg.intersegs.end(), [](const auto &a, const auto &b){
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return a.offset < b.offset;
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});
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}
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}
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static void print_symbols2(void) {
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for (const auto &e : symbol_table) {
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char q = ' ';
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if (!e.count) q = '?';
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if (!e.defined) q = '!';
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fprintf(stdout, "%c %-20s=$%06x\n", q, e.name.c_str(), e.value);
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}
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}
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static void print_symbols(void) {
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if (symbol_table.empty()) return;
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/* alpha */
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fputs("\nSymbol table, alphabetical order:\n", stdout);
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std::sort(symbol_table.begin(), symbol_table.end(),
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[](const symbol &a, const symbol &b){
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return a.name < b.name;
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});
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print_symbols2();
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fputs("\nSymbol table, numerical order:\n", stdout);
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/* numeric */
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std::sort(symbol_table.begin(), symbol_table.end(),
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[](const symbol &a, const symbol &b){
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return a.value < b.value;
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});
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print_symbols2();
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}
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void finish(void) {
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resolve();
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print_symbols();
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try {
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save_omf(save_file, segments, compress, express);
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set_file_type(save_file, ftype, atype);
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} catch (std::exception &ex) {
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errx(EX_OSERR, "%s: %s", save_file.c_str(), ex.what());
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}
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}
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static bool op_needs_label(opcode_t op) {
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switch (op) {
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case OP_KBD:
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case OP_EQ:
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case OP_EQU:
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case OP_GEQ:
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return true;
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default:
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return false;
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}
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}
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static bool op_after_end(opcode_t op) {
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switch(op) {
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|
case OP_END:
|
|
case OP_CMD:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
|
|
extern uint32_t number_operand(const char *cursor, int flags = OP_REQUIRED);
|
|
extern uint32_t number_operand(const char *cursor, const std::unordered_map<std::string, uint32_t> &, int flags = OP_REQUIRED);
|
|
extern int ovr_operand(const char *cursor);
|
|
extern std::string label_operand(const char *cursor, int flags = OP_REQUIRED);
|
|
extern std::string string_operand(const char *cursor, int flags = OP_REQUIRED);
|
|
extern std::string path_operand(const char *cursor, int flags = OP_REQUIRED);
|
|
|
|
extern void no_operand(const char *cursor);
|
|
|
|
static std::string basename(const std::string &str) {
|
|
|
|
auto ix = str.find_last_of("/:");
|
|
if (ix == str.npos) return str;
|
|
return str.substr(0, ix);
|
|
}
|
|
|
|
void evaluate(label_t label, opcode_t opcode, const char *cursor) {
|
|
|
|
// todo - should move operand parsing to here.
|
|
|
|
switch(opcode) {
|
|
case OP_DO:
|
|
if (active_bits & 0x80000000) throw std::runtime_error("too much do do");
|
|
active_bits <<= 1;
|
|
if (active) {
|
|
uint32_t value = number_operand(cursor, local_symbol_table);
|
|
active_bits |= value ? 1 : 0;
|
|
active = (active_bits & (active_bits + 1)) == 0;
|
|
}
|
|
return;
|
|
break;
|
|
|
|
case OP_ELS:
|
|
if (active_bits < 2)
|
|
throw std::runtime_error("els without do");
|
|
|
|
active_bits ^= 0x01;
|
|
active = (active_bits & (active_bits + 1)) == 0;
|
|
return;
|
|
break;
|
|
|
|
case OP_FIN:
|
|
active_bits >>= 1;
|
|
if (!active_bits) {
|
|
active = 1;
|
|
throw std::runtime_error("fin without do");
|
|
}
|
|
active = (active_bits & (active_bits + 1)) == 0;
|
|
return;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
if (!active) return;
|
|
|
|
if (label.empty() && op_needs_label(opcode))
|
|
throw std::runtime_error("Bad label");
|
|
|
|
if (end && !op_after_end(opcode)) return;
|
|
|
|
switch(opcode) {
|
|
|
|
case OP_END:
|
|
if (!end && lkv == 2) {
|
|
/* finish up */
|
|
segments.pop_back();
|
|
relocations.pop_back();
|
|
if (!segments.empty())
|
|
finish();
|
|
}
|
|
end = true;
|
|
break;
|
|
|
|
case OP_DAT: {
|
|
/* 29-DEC-88 4:18:37 PM */
|
|
time_t t = time(nullptr);
|
|
struct tm *tm = localtime(&t);
|
|
char buffer[32];
|
|
|
|
strftime(buffer, sizeof(buffer), "%d-%b-%y %l:%M:%S %p", tm);
|
|
for (char &c : buffer) c = std::toupper(c);
|
|
|
|
fprintf(stdout, "%s\n", buffer);
|
|
break;
|
|
}
|
|
|
|
|
|
case OP_TYP:
|
|
ftype = number_operand(cursor, file_types, OP_REQUIRED | OP_INSENSITIVE);
|
|
break;
|
|
case OP_ADR:
|
|
atype = number_operand(cursor, local_symbol_table);
|
|
break;
|
|
case OP_KND:
|
|
kind = number_operand(cursor, local_symbol_table);
|
|
break;
|
|
|
|
case OP_LKV: {
|
|
/* specify linker version */
|
|
/* 0 = binary, 1 = Linker.GS, 2 = Linker.XL, 3 = convert to OMF object file */
|
|
|
|
uint32_t value = number_operand(cursor, local_symbol_table);
|
|
switch (value) {
|
|
case 0: throw std::runtime_error("binary linker not supported");
|
|
case 3: throw std::runtime_error("object file linker not supported");
|
|
case 1:
|
|
case 2:
|
|
lkv = value;
|
|
break;
|
|
default:
|
|
throw std::runtime_error("bad linker version");
|
|
}
|
|
break;
|
|
}
|
|
|
|
case OP_VER: {
|
|
/* OMF version, 1 or 2 */
|
|
uint32_t value = number_operand(cursor, local_symbol_table);
|
|
|
|
if (value != 2)
|
|
throw std::runtime_error("bad OMF version");
|
|
ver = value;
|
|
break;
|
|
}
|
|
|
|
case OP_LNK: {
|
|
if (end) throw std::runtime_error("link after end");
|
|
|
|
std::string path = path_operand(cursor);
|
|
process_unit(path);
|
|
break;
|
|
}
|
|
|
|
case OP_SAV: {
|
|
if (end) throw std::runtime_error("save after end");
|
|
|
|
std::string path = path_operand(cursor);
|
|
|
|
/* use 1st SAV as the path */
|
|
if (save_file.empty()) save_file = path;
|
|
|
|
/*
|
|
lkv 0 = binary linker (unsupported)
|
|
lkv 1 = 1 segment GS linker
|
|
lkv 2 = multi-segment GS linker
|
|
lkv 3 = convert REL to OMF object file (unsupported)
|
|
*/
|
|
|
|
if (lkv == 1 || lkv == 2 || lkv == 3) {
|
|
auto &seg = segments.back();
|
|
std::string base = basename(path);
|
|
seg.segname = std::move(base);
|
|
seg.kind = kind;
|
|
}
|
|
if (lkv == 1) {
|
|
finish();
|
|
end = true;
|
|
}
|
|
if (lkv == 2) {
|
|
/* add a new segment */
|
|
segments.emplace_back();
|
|
relocations.emplace_back();
|
|
pos_offset = 0; // POS support
|
|
}
|
|
++sav;
|
|
break;
|
|
}
|
|
|
|
case OP_KBD: {
|
|
char buffer[256];
|
|
|
|
if (!isatty(STDIN_FILENO)) return;
|
|
|
|
/* todo if already defined (via -D) don't prompt */
|
|
if (local_symbol_table.find(label) != local_symbol_table.end())
|
|
return;
|
|
|
|
std::string prompt = string_operand(cursor, OP_OPTIONAL);
|
|
|
|
if (prompt.empty()) prompt = "Give value for " + label;
|
|
prompt += ": ";
|
|
fputs(prompt.c_str(), stdout);
|
|
fflush(stdout);
|
|
|
|
char *cp = fgets(buffer, sizeof(buffer), stdin);
|
|
|
|
if (!cp) throw std::runtime_error("Bad input");
|
|
|
|
uint32_t value = number_operand(cp, local_symbol_table, true);
|
|
|
|
define(label, value, LBL_KBD);
|
|
break;
|
|
}
|
|
|
|
case OP_POS: {
|
|
// POS label << sets label = current segment offset
|
|
// POS << resets pos byte counter.
|
|
|
|
std::string label = label_operand(cursor, OP_OPTIONAL);
|
|
if (label.empty()) {
|
|
pos_offset = segments.back().data.size();
|
|
} else {
|
|
uint32_t value = segments.back().data.size() - pos_offset;
|
|
|
|
define(label, value, LBL_POS);
|
|
}
|
|
break;
|
|
}
|
|
case OP_LEN: {
|
|
// LEN label
|
|
// sets label = length of most recent file linked
|
|
|
|
std::string label = label_operand(cursor);
|
|
uint32_t value = len_offset;
|
|
define(label, value, LBL_LEN);
|
|
break;
|
|
}
|
|
|
|
case OP_EQ:
|
|
define(label, number_operand(cursor, local_symbol_table), LBL_EQ);
|
|
break;
|
|
case OP_EQU:
|
|
define(label, number_operand(cursor, local_symbol_table), LBL_EQU);
|
|
break;
|
|
case OP_GEQ:
|
|
define(label, number_operand(cursor, local_symbol_table), LBL_GEQ);
|
|
break;
|
|
|
|
case OP_SEG: {
|
|
/* OMF object file linker - set the object file seg name */
|
|
std::string name = label_operand(cursor);
|
|
break;
|
|
}
|
|
|
|
case OP_FAS:
|
|
/* fast linker, only 1 file allowed */
|
|
fas = true;
|
|
break;
|
|
case OP_OVR:
|
|
ovr = ovr_operand(cursor);
|
|
break;
|
|
|
|
case OP_PUT: {
|
|
std::string path = path_operand(cursor);
|
|
break;
|
|
}
|
|
case OP_IF: {
|
|
std::string path = path_operand(cursor);
|
|
break;
|
|
}
|
|
|
|
case OP_ASM: {
|
|
std::string path = path_operand(cursor);
|
|
break;
|
|
}
|
|
default:
|
|
throw std::runtime_error("opcode not yet supported");
|
|
}
|
|
|
|
}
|
|
|
|
void process_script(const char *path) {
|
|
|
|
extern void parse_line(const char *);
|
|
|
|
FILE *fp = nullptr;
|
|
|
|
if (!path || !strcmp(path, "-")) fp = stdin;
|
|
else {
|
|
fp = fopen(path, "r");
|
|
if (!fp) {
|
|
err(1, "Unable to open %s", path);
|
|
}
|
|
}
|
|
|
|
|
|
segments.emplace_back();
|
|
relocations.emplace_back();
|
|
|
|
int no = 1;
|
|
int errors = 0;
|
|
char *line = NULL;
|
|
size_t cap = 0;
|
|
for(;; ++no) {
|
|
|
|
ssize_t len = getline(&line, &cap, fp);
|
|
if (len == 0) break;
|
|
if (len < 0) break;
|
|
|
|
/* strip trailing ws */
|
|
while (len && isspace(line[len-1])) --len;
|
|
line[len] = 0;
|
|
if (len == 0) continue;
|
|
|
|
try {
|
|
parse_line(line);
|
|
} catch (std::exception &ex) {
|
|
if (!active) continue;
|
|
|
|
fprintf(stderr, "%s in line: %d\n", ex.what(), no);
|
|
fprintf(stderr, "%s\n", line);
|
|
if (++errors >= 10) {
|
|
fputs("Too many errors, aborting\n", stderr);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (fp != stdin)
|
|
fclose(fp);
|
|
free(line);
|
|
exit(errors ? EX_DATAERR : 0);
|
|
}
|
|
|
|
|
|
|
|
|
|
void process_files(int argc, char **argv) {
|
|
|
|
segments.emplace_back();
|
|
relocations.emplace_back();
|
|
|
|
for (int i = 0; i < argc; ++i) {
|
|
char *path = argv[i];
|
|
try {
|
|
process_unit(path);
|
|
} catch (std::exception &ex) {
|
|
errx(EX_DATAERR, "%s: %s", path, ex.what());
|
|
}
|
|
}
|
|
}
|
|
|