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wdc-utils/dumpobj.cpp
Kelvin Sherlock 7a2168afc7 section updates
2016-12-28 15:15:31 -05:00

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#include <string>
#include <err.h>
#include <unistd.h>
#include <sysexits.h>
#include <stdlib.h>
#include <fcntl.h>
#include <assert.h>
#include <stdio.h>
#include <type_traits>
#include <vector>
#include <algorithm>
#include <iterator>
#include "obj816.h"
#include "disassembler.h"
#ifndef O_BINARY
#define O_BINARY 0
#endif
enum class endian {
little = __ORDER_LITTLE_ENDIAN__,
big = __ORDER_BIG_ENDIAN__,
native = __BYTE_ORDER__
};
//extern unsigned init_flags(bool longM, bool longX);
//void dump(const std::vector<uint8_t> &data, unsigned &pc);
//extern void disasm(const std::vector<uint8_t> &data, unsigned &flags, unsigned &pc);
template<class T>
void swap_if(T &t, std::false_type) {}
void swap_if(uint8_t &, std::true_type) {}
void swap_if(uint16_t &value, std::true_type) {
value = __builtin_bswap16(value);
}
void swap_if(uint32_t &value, std::true_type) {
value = __builtin_bswap32(value);
}
void swap_if(uint64_t &value, std::true_type) {
value = __builtin_bswap64(value);
}
template<class T>
void le_to_host(T &value) {
swap_if(value, std::integral_constant<bool, endian::native == endian::big>{});
}
void usage() {
exit(EX_USAGE);
}
#pragma pack(push, 1)
struct Header {
uint32_t h_magic; /* magic number for detection */
uint16_t h_version; /* version number of object format */
uint8_t h_filtyp; /* file type, object or library */
};
#pragma pack(pop)
template<class T>
uint8_t read_8(T &iter) {
uint8_t tmp = *iter;
++iter;
return tmp;
}
template<class T>
uint16_t read_16(T &iter) {
uint16_t tmp = 0;
tmp |= *iter << 0;
++iter;
tmp |= *iter << 8;
++iter;
return tmp;
}
template<class T>
uint16_t read_32(T &iter) {
uint32_t tmp = 0;
tmp |= *iter << 0;
++iter;
tmp |= *iter << 8;
++iter;
tmp |= *iter << 16;
++iter;
tmp |= *iter << 24;
++iter;
return tmp;
}
template<class T>
std::string read_cstring(T &iter) {
std::string s;
for(;;) {
uint8_t c = *iter;
++iter;
if (!c) break;
s.push_back(c);
}
return s;
}
template<class T>
std::string read_pstring(T &iter) {
std::string s;
unsigned size = *iter;
++iter;
s.reserve(size);
while (size--) {
uint8_t c = *iter;
++iter;
s.push_back(c);
}
return s;
}
struct symbol {
std::string name;
uint8_t type = S_UND;
uint8_t flags = 0;
uint8_t section = 0xff;
uint32_t offset = 0;
};
struct section {
std::string name;
uint8_t number = 0;
uint8_t flags = 0;
uint32_t size = 0;
uint32_t org = 0;
uint32_t pc = 0;
};
std::vector<section> read_sections(const std::vector<uint8_t> &section_data) {
std::vector<section> sections;
auto iter = section_data.begin();
while (iter != section_data.end()) {
section s;
s.number = read_8(iter);
s.flags = read_8(iter);
s.size = read_32(iter);
s.org = read_32(iter);
if (!(s.flags & SEC_NONAME)) s.name = read_cstring(iter);
if (sections.size() < s.number) sections.resize(s.number);
if (sections.size() == s.number) sections.emplace_back(std::move(s));
else sections[s.number] = std::move(s);
}
return sections;
}
std::vector<symbol> read_symbols(const std::vector<uint8_t> &symbol_data) {
std::vector<symbol> symbols;
auto iter = symbol_data.begin();
while (iter != symbol_data.end()) {
symbol s;
s.type = read_8(iter);
s.flags = read_8(iter);
s.section = read_8(iter);
s.offset = s.type == S_UND ? 0 : read_32(iter);
s.name = read_cstring(iter);
symbols.emplace_back(std::move(s));
}
return symbols;
}
std::vector<symbol> labels_for_section(const std::vector<symbol> &symbols, unsigned section) {
std::vector<symbol> out;
std::copy_if(symbols.begin(), symbols.end(), std::back_inserter(out),
[section](const symbol &s) { return s.section == section && s.type != S_UND; }
);
std::sort(out.begin(), out.end(), [](const symbol &a, const symbol &b){
return a.offset > b.offset;
});
return out;
}
symbol find_symbol(const std::vector<symbol> &symbols, unsigned section, unsigned offset) {
auto iter = std::find_if(symbols.begin(), symbols.end(), [section, offset](const symbol &s){
return s.section == section && s.offset == offset && s.type != S_UND;
});
if (iter != symbols.end()) return *iter;
return symbol{};
}
void place_labels(std::vector<symbol> &labels, uint32_t pc) {
while (!labels.empty()) {
auto &label = labels.back();
if (label.offset > pc) return;
if (label.offset == pc) {
printf("%s:\n", label.name.c_str());
} else {
warnx("Unable to place label %s (offset $%04x)", label.name.c_str(), label.offset);
}
labels.pop_back();
}
}
bool dump_obj(const char *name, int fd)
{
static const char *kSections[] = { "PAGE0", "CODE", "KDATA", "DATA", "UDATA" };
static const char *kTypes[] = { "S_UND", "S_ABS", "S_REL", "S_EXP", "S_REG", "S_FREG" };
Mod_head h;
ssize_t ok;
ok = read(fd, &h, sizeof(h));
if (ok == 0) return false;
if (ok != sizeof(h))
errx(EX_DATAERR, "%s is not an object file", name);
le_to_host(h.h_magic);
le_to_host(h.h_version);
le_to_host(h.h_filtyp);
le_to_host(h.h_namlen);
le_to_host(h.h_recsize);
le_to_host(h.h_secsize);
le_to_host(h.h_symsize);
le_to_host(h.h_optsize);
le_to_host(h.h_tot_secs);
le_to_host(h.h_num_secs);
le_to_host(h.h_num_syms);
assert(h.h_magic == MOD_MAGIC);
assert(h.h_version == 1);
assert(h.h_filtyp == 1);
// now read the name (h_namlen includes 0 terminator.)
std::vector<char> oname;
oname.resize(h.h_namlen);
ok = read(fd, oname.data(), h.h_namlen);
if (ok != h.h_namlen) errx(EX_DATAERR, "%s", name);
printf("name: %s\n", oname.data());
printf("record size : $%04x\n", h.h_recsize);
printf("section size : $%04x\n", h.h_secsize);
printf("symbol size : $%04x\n", h.h_symsize);
printf("option size : $%04x\n", h.h_optsize);
printf("number sections: $%04x\n", h.h_num_secs);
printf("number symbols : $%04x\n", h.h_num_syms);
// records [until record_eof]
std::vector<uint8_t> data;
data.resize(h.h_recsize);
ok = read(fd, data.data(), h.h_recsize);
if (ok != h.h_recsize) errx(EX_DATAERR, "%s records truncated", name);
std::vector<uint8_t> section_data;
section_data.resize(h.h_secsize);
ok = read(fd, section_data.data(), h.h_secsize);
if (ok != h.h_secsize) errx(EX_DATAERR, "%s sections truncated", name);
std::vector<uint8_t> symbol_data;
symbol_data.resize(h.h_symsize);
ok = read(fd, symbol_data.data(), h.h_symsize);
if (ok != h.h_symsize) errx(EX_DATAERR, "%s symbols truncated", name);
std::vector<symbol> symbols = read_symbols(symbol_data);
std::vector<section> sections = read_sections(section_data);
disassembler d;
uint8_t op = REC_END;
unsigned section = SECT_CODE; // default section = CODE
unsigned line = 0;
std::string file;
if (sections.size() < 5) sections.resize(5);
for (int i = 0; i < 5; ++i)
if (sections[i].name.empty()) sections[i].name = kSections[i];
d.set_pc(0);
d.set_code(true);
std::vector<symbol> labels = labels_for_section(symbols, section);
auto iter = data.begin();
while (iter != data.end()) {
place_labels(labels, d.pc());
op = read_8(iter);
if (op == 0) break;
if (op < 0xf0) {
auto end = iter + op;
while (iter != end) {
d(*iter++);
place_labels(labels, d.pc());
}
continue;
}
switch(op) {
case REC_RELEXP:
case REC_EXPR:
{
// todo -- pass the relative flag to ()
// so it can verify it's appropriate for the opcode.
// todo -- move all this stuff to a separate function.
uint8_t size = read_8(iter);
char buffer[32];
std::vector<std::string> stack;
// todo -- need to keep operation for precedence?
// this ignores all precedence...
for(;;) {
uint8_t op = read_8(iter);
if (op == OP_END) break;
switch (op) {
case OP_LOC: {
uint8_t section = read_8(iter);
uint32_t offset = read_32(iter);
std::string name;
symbol s = find_symbol(symbols, section, offset);
if (s.type) {
name = s.name;
} else {
if (section < sizeof(kSections) / sizeof(kSections[0]))
name = kSections[section];
else {
snprintf(buffer, sizeof(buffer), "section%d", section);
name = buffer;
}
}
if (offset) {
snprintf(buffer, sizeof(buffer), "+$%04x", offset);
name += buffer;
}
stack.push_back(name);
break;
}
case OP_VAL:
snprintf(buffer, sizeof(buffer), "$%04x", read_32(iter));
stack.push_back(buffer);
break;
case OP_SYM: {
uint16_t symbol = read_16(iter);
if (symbol < symbols.size()) stack.push_back(symbols[symbol].name);
else {
snprintf(buffer, sizeof(buffer), "symbol $%02x", symbol);
stack.push_back(buffer);
}
break;
}
// unary operatos
case OP_NOT:
case OP_NEG:
case OP_FLP: {
static const char *ops[] = {
".NOT.", "-", "\\"
};
if (stack.empty()) errx(EX_DATAERR, "%s : stack underflow error", name);
std::string a = std::move(stack.back()); stack.pop_back();
std::string b(ops[op-10]);
stack.emplace_back(b + a);
break;
}
// binary operators
case OP_SHR:
case OP_SHL:
case OP_ADD:
case OP_SUB: {
static const char *ops[] = {
"**", "*", "/", ".MOD.", ">>", "<<", "+", "-", "&", "|", "^", "=", ">", "<"
};
if (stack.size() < 2) errx(EX_DATAERR, "%s : stack underflow error", name);
std::string a = std::move(stack.back()); stack.pop_back();
std::string b = std::move(stack.back()); stack.pop_back();
stack.emplace_back(b + ops[op-20] + a);
break;
}
default:
errx(EX_DATAERR, "%s: unknown expression opcode %02x", name, op);
}
}
if (stack.size() != 1) errx(EX_DATAERR, "%s stack overflow error.", name);
d(stack.front(), size);
}
break;
case REC_DEBUG:
{
static const char *debugs[] = {
"D_C_FILE",
"D_C_LINE",
"D_C_SYM",
"D_C_STAG",
"D_C_ETAG",
"D_C_UTAG",
"D_C_MEMBER",
"D_C_EOS",
"D_C_FUNC",
"D_C_ENDFUNC",
"D_C_BLOCK",
"D_C_ENDBLOCK",
"D_LONGA_ON",
"D_LONGA_OFF",
"D_LONGI_ON",
"D_LONGI_OFF",
};
d.flush();
uint16_t size = read_16(iter);
//printf("\t;DEBUG\n");
auto end = iter + size;
while (iter < end) {
uint8_t op = read_8(iter);
switch(op) {
case D_LONGA_ON:
d.set_m(true);
printf("\tlonga\ton\n");
break;
case D_LONGA_OFF:
d.set_m(false);
printf("\tlonga\toff\n");
break;
case D_LONGI_ON:
d.set_x(true);
printf("\tlongi\ton\n");
break;
case D_LONGI_OFF:
d.set_x(false);
printf("\tlongi\toff\n");
break;
case D_C_FILE: {
file = read_cstring(iter);
line = read_16(iter);
printf("\t.file\t\"%s\", %d\n", file.c_str(), line);
break;
}
case D_C_LINE: {
line = read_16(iter);
printf("\t.line\t%d\n", line);
break;
}
case D_C_BLOCK: {
uint16_t block = read_16(iter);
printf("\t.block\t%d\n", block);
break;
}
case D_C_FUNC: {
uint16_t arg = read_16(iter);
printf("\t.function\t%d\n", arg);
break;
}
/*
case D_C_SYM: {
break;
}
*/
default:
errx(EX_DATAERR, "%s: unknown debug opcode %02x (%d)", name, op, op);
break;
}
}
}
break;
case REC_SECT: {
d.flush();
uint8_t sec = read_8(iter);
printf("\t.sect\t%d\n", sec);
if (sec != section) {
sections[section].pc = d.pc();
section = sec;
d.set_pc(sections[section].pc);
labels = labels_for_section(symbols, section);
d.set_code(section == 1 || section > 4);
}
break;
}
case REC_ORG: {
d.flush();
uint32_t org = read_32(iter);
printf("\t.org\t$%04x\n", org);
d.set_pc(org);
break;
}
case REC_SPACE: {
d.flush();
uint16_t count = read_16(iter);
printf("\tds\t$%04x\n", count);
d.set_pc(d.pc() + count);
break;
}
case REC_LINE: {
// bump line counter, no argument.
d.flush();
++line;
break;
}
default:
d.flush();
errx(EX_DATAERR, "%s: unknown opcode %02x", name, op);
}
}
place_labels(labels, d.pc());
for(auto &label : labels) {
warnx("Unable to place label %s (offset $%04x)", label.name.c_str(), label.offset);
}
if (iter != data.end() || op != REC_END) errx(EX_DATAERR, "%s records ended early", name);
// section info
printf("\nSections\n");
for(const auto &s : sections) {
if (s.size) {
printf("section %d\n", s.number);
if (!(s.flags & SEC_NONAME))
printf("name: %s\n", s.name.c_str());
printf("flags: %02x ", s.flags);
#undef _
#define _(x) if (s.flags & x) fputs(#x " ", stdout)
_(SEC_OFFSET);
_(SEC_INDIRECT);
_(SEC_STACKED);
_(SEC_REF_ONLY);
_(SEC_CONST);
_(SEC_DIRECT);
_(SEC_NONAME);
fputs("\n", stdout);
}
}
// symbol info
#if 0
printf("\nSymbols\n");
iter = symbol_data.begin();
while (iter != symbol_data.end()) {
uint8_t type = read_8(iter);
uint8_t flags = read_8(iter);
uint8_t section = read_8(iter);
uint32_t offset = type == S_UND ? 0 : read_32(iter);
std::string name = read_cstring(iter);
printf("name : %s\n", name.c_str());
printf("type : $%02x %s\n", type, type < sizeof(kTypes) / sizeof(kTypes[0]) ? kTypes[type] : "");
printf("flags: $%02x ", flags);
#undef _
#define _(x) if (flags & x) fputs(#x " ", stdout)
_(SF_GBL);
_(SF_DEF);
_(SF_REF);
_(SF_VAR);
_(SF_PG0);
_(SF_TMP);
_(SF_DEF2);
_(SF_LIB);
fputs("\n", stdout);
printf("section: %02x %s\n", section,
section < sizeof(sections) / sizeof(sections[0]) ? sections[section] : "");
if (type != S_UND)
printf("offset: %04x\n", offset);
}
#endif
return true;
}
void dump_lib(const char *name, int fd)
{
Lib_head h;
ssize_t ok;
ok = read(fd, &h, sizeof(h));
if (ok != sizeof(h))
errx(EX_DATAERR, "%s is not an object file", name);
le_to_host(h.l_magic);
le_to_host(h.l_version);
le_to_host(h.l_filtyp);
le_to_host(h.l_modstart);
le_to_host(h.l_numsyms);
le_to_host(h.l_symsize);
le_to_host(h.l_numfiles);
assert(h.l_magic == MOD_MAGIC);
assert(h.l_version == 1);
assert(h.l_filtyp == 2);
printf("modstart : $%04x\n", h.l_modstart);
printf("number symbols: $%04x\n", h.l_numsyms);
printf("number files : $%04x\n", h.l_numfiles);
printf("\n");
std::vector<uint8_t> data;
long count = h.l_modstart - sizeof(h);
if (count < 0) errx(EX_DATAERR, "%s", name);
data.reserve(count);
ok = read(fd, data.data(), count);
if (ok != count) errx(EX_DATAERR, "%s truncated", name);
// files
auto iter = data.begin();
for (int i = 0; i < h.l_numfiles; ++i) {
uint16_t file_number = read_16(iter);
std::string s = read_pstring(iter);
printf("$%02x %s\n", file_number, s.c_str());
}
printf("\n");
// symbols
auto name_iter = iter + h.l_numsyms * 8;
for (int i = 0; i < h.l_numsyms; ++i) {
uint16_t name_offset = read_16(iter);
uint16_t file_number = read_16(iter);
uint32_t offset = read_32(iter);
std::string name = read_pstring(name_iter);
printf("symbol : $%04x %s\n", i, name.c_str());
//printf("name offset: %02x\n", name_offset);
printf("file_number : $%02x\n", file_number);
printf("module offset: $%04x\n", offset);
}
printf("\n");
}
void dump(const char *name) {
Header h;
int fd;
ssize_t ok;
fd = open(name, O_RDONLY | O_BINARY);
if (fd < 0) err(EX_NOINPUT, "Unable to open %s", name);
ok = read(fd, &h, sizeof(h));
if (ok != sizeof(h))
errx(EX_DATAERR, "%s is not an object file", name);
le_to_host(h.h_magic);
le_to_host(h.h_version);
le_to_host(h.h_filtyp);
if (h.h_magic != MOD_MAGIC || h.h_version != 1 || h.h_filtyp > 2)
errx(EX_DATAERR, "%s is not an object file", name);
lseek(fd, 0, SEEK_SET);
if (h.h_filtyp == 2) dump_lib(name, fd);
// files may contain multiple modules.
while (dump_obj(name, fd)) /* ... */;
close(fd);
}
int main(int argc, char **argv) {
int c;
while ((c = getopt(argc, argv, "")) != -1) {
}
argv += optind;
argc -= optind;
if (argc == 0) usage();
for (int i = 0; i < argc; ++i) {
dump(argv[i]);
}
return 0;
}
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