wdc-utils/omf.cpp

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#include "omf.h"
#include <vector>
#include <string>
#include <algorithm>
#include <unistd.h>
#include <fcntl.h>
#include <err.h>
#include <sysexits.h>
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#ifndef O_BINARY
#define O_BINARY 0
#endif
#pragma pack(push, 1)
struct omf_header {
uint32_t bytecount = 0;
uint32_t reserved_space = 0;
uint32_t length = 0;
uint8_t unused1 = 0;
uint8_t lablen = 0;
uint8_t numlen = 4;
uint8_t version = 2;
uint32_t banksize = 0;
uint16_t kind = 0;
uint16_t unused2 = 0;
uint32_t org = 0;
uint32_t alignment = 0;
uint8_t numsex = 0;
uint8_t unused3 = 0;
uint16_t segnum = 0;
uint32_t entry = 0;
uint16_t dispname = 0;
uint16_t dispdata = 0;
};
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struct omf_express_header {
uint32_t lconst_mark;
uint32_t lconst_size;
uint32_t reloc_mark;
uint32_t reloc_size;
uint8_t unused1 = 0;
uint8_t lablen = 0;
uint8_t numlen = 4;
uint8_t version = 2;
uint32_t banksize = 0;
uint16_t kind = 0;
uint16_t unused2 = 0;
uint32_t org = 0;
uint32_t alignment = 0;
uint8_t numsex = 0;
uint8_t unused3 = 0;
uint16_t segnum = 0;
uint32_t entry = 0;
uint16_t dispname = 0;
uint16_t dispdata = 0;
};
#pragma pack(pop)
void push(std::vector<uint8_t> &v, uint8_t x) {
v.push_back(x);
}
void push(std::vector<uint8_t> &v, uint16_t x) {
v.push_back(x & 0xff);
x >>= 8;
v.push_back(x & 0xff);
}
void push(std::vector<uint8_t> &v, uint32_t x) {
v.push_back(x & 0xff);
x >>= 8;
v.push_back(x & 0xff);
x >>= 8;
v.push_back(x & 0xff);
x >>= 8;
v.push_back(x & 0xff);
}
void push(std::vector<uint8_t> &v, const std::string &s) {
uint8_t count = std::min((int)s.size(), 255);
push(v, count);
v.insert(v.end(), s.begin(), s.end());
}
void save_omf(std::vector<omf::segment> &segments, bool expressload, const std::string &path) {
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// expressload doesn't support links to other files.
// fortunately, we don't either.
std::vector<uint8_t> expr_headers;
std::vector<unsigned> expr_offsets;
int fd;
fd = open(path.c_str(), O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0666);
if (fd < 0) {
err(EX_CANTCREAT, "Unable to open %s", path.c_str());
}
uint32_t offset = 0;
if (expressload) {
for (auto &s : segments) {
s.segnum++;
for (auto &r : s.intersegs) r.segment++;
}
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// calculate express load segment size.
// sizeof includes the trailing 0, so no need to add in byte size.
offset = sizeof(omf_header) + 10 + sizeof("~ExpressLoad");
offset += 6; // lconst + end
offset += 6; // header.
for (auto &s : segments) {
offset += 8 + 2;
offset += sizeof(omf_express_header) + 10;
offset += s.segname.length() + 1;
}
lseek(fd, offset, SEEK_SET);
}
for (auto &s : segments) {
omf_header h;
h.length = s.data.size();
h.kind = s.kind;
h.banksize = s.data.size() > 0xffff ? 0x0000 : 0x010000;
h.segnum = s.segnum;
std::vector<uint8_t> data;
// push segname and load name onto data.
data.insert(data.end(), 10, ' ');
push(data, s.segname);
h.dispname = sizeof(omf_header);
h.dispdata = sizeof(omf_header) + data.size();
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uint32_t lconst_offset = offset + sizeof(omf_header) + data.size() + 5;
uint32_t lconst_size = h.length;
//lconst record
push(data, (uint8_t)0xf2);
push(data, (uint32_t)h.length);
data.insert(data.end(), s.data.begin(), s.data.end());
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uint32_t reloc_offset = offset + sizeof(omf_header) + data.size();
uint32_t reloc_size = 0;
// should interseg/reloc records be sorted?
// todo -- compress into super records.
for (const auto &r : s.relocs) {
if (r.can_compress()) {
push(data, (uint8_t)0xf5);
push(data, (uint8_t)r.size);
push(data, (uint8_t)r.shift);
push(data, (uint16_t)r.offset);
push(data, (uint16_t)r.value);
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reloc_size += 7;
} else {
push(data, (uint8_t)0xe5);
push(data, (uint8_t)r.size);
push(data, (uint8_t)r.shift);
push(data, (uint32_t)r.offset);
push(data, (uint32_t)r.value);
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reloc_size += 11;
}
}
for (const auto &r : s.intersegs) {
if (r.can_compress()) {
push(data, (uint8_t)0xf6);
push(data, (uint8_t)r.size);
push(data, (uint8_t)r.shift);
push(data, (uint16_t)r.offset);
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push(data, (uint8_t)r.segment);
push(data, (uint16_t)r.segment_offset);
reloc_size += 8;
} else {
push(data, (uint8_t)0xe3);
push(data, (uint8_t)r.size);
push(data, (uint8_t)r.shift);
push(data, (uint32_t)r.offset);
push(data, (uint16_t)r.file);
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push(data, (uint16_t)r.segment);
push(data, (uint32_t)r.segment_offset);
reloc_size += 15;
}
}
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// end-of-record
push(data, (uint8_t)0x00);
h.bytecount = data.size() + sizeof(omf_header);
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// todo -- byteswap to little-endian!
offset += write(fd, &h, sizeof(h));
offset += write(fd, data.data(), data.size());
if (expressload) {
expr_offsets.emplace_back(expr_headers.size());
if (lconst_size == 0) lconst_offset = 0;
if (reloc_size == 0) reloc_offset = 0;
push(expr_headers, (uint32_t)lconst_offset);
push(expr_headers, (uint32_t)lconst_size);
push(expr_headers, (uint32_t)reloc_offset);
push(expr_headers, (uint32_t)reloc_size);
push(expr_headers, h.unused1);
push(expr_headers, h.lablen);
push(expr_headers, h.numlen);
push(expr_headers, h.version);
push(expr_headers, h.banksize);
push(expr_headers, h.kind);
push(expr_headers, h.unused2);
push(expr_headers, h.org);
push(expr_headers, h.alignment);
push(expr_headers, h.numsex);
push(expr_headers, h.unused3);
push(expr_headers, h.segnum);
push(expr_headers, h.entry);
push(expr_headers, (uint16_t)(h.dispname-4));
push(expr_headers, h.dispdata);
expr_headers.insert(expr_headers.end(), 10, ' ');
push(expr_headers, s.segname);
}
}
if (expressload) {
omf_header h;
h.segnum = 1;
h.banksize = 0x00010000;
h.kind = 0x8001;
h.dispname = 0x2c;
h.dispdata = 0x43;
unsigned fudge = 10 * segments.size();
h.length = 6 + expr_headers.size() + fudge;
std::vector<uint8_t> data;
data.insert(data.begin(), 10, ' ');
push(data, std::string("~ExpressLoad"));
push(data, (uint8_t)0xf2); // lconst.
push(data, (uint32_t)h.length);
push(data, (uint32_t)0); // reserved
push(data, (uint16_t)(segments.size() - 1)); // seg count - 1
for (auto &offset : expr_offsets) {
push(data, (uint16_t)(fudge + offset));
push(data, (uint16_t)0);
push(data, (uint32_t)0);
}
for (auto &s : segments) {
push(data, (uint16_t)s.segnum);
}
data.insert(data.end(), expr_headers.begin(), expr_headers.end());
push(data, (uint8_t)0); // end.
h.bytecount = data.size() + sizeof(omf_header);
lseek(fd, 0, SEEK_SET);
write(fd, &h, sizeof(h));
write(fd, data.data(), data.size());
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}
close(fd);
}