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libmach: support reading symbols from Windows .exe for nm
Fixes #979. R=rsc, alex.brainman CC=golang-dev, vcc.163 https://golang.org/cl/4894051
This commit is contained in:
Mateusz Czapliński
Russ Cox
parent
d8333d41f2
commit
eae0a48cf5
@ -142,6 +142,7 @@ enum
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FAMD64B, /* 6.out bootable */
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FPOWER64, /* 9.out */
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FPOWER64B, /* 9.out bootable */
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FWINPE, /* windows PE executable */
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ANONE = 0, /* dissembler types */
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AMIPS,
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@ -32,6 +32,11 @@ static char dosstub[] =
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0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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// Note: currently only up to 8 chars plus \0.
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static char *symlabels[] = {
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"symtab", "esymtab", "pclntab", "epclntab"
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};
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static Sym *rsrcsym;
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static char symnames[256];
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@ -44,6 +49,7 @@ static int pe64;
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static int nsect;
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static int nextsectoff;
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static int nextfileoff;
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static int textsect;
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static IMAGE_FILE_HEADER fh;
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static IMAGE_OPTIONAL_HEADER oh;
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@ -449,20 +455,29 @@ addsymtable(void)
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{
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IMAGE_SECTION_HEADER *h;
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int i, size;
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Sym *s;
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if(nextsymoff == 0)
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return;
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size = nextsymoff + 4 + 18;
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fh.NumberOfSymbols = sizeof(symlabels)/sizeof(symlabels[0]);
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size = nextsymoff + 4 + 18*fh.NumberOfSymbols;
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h = addpesection(".symtab", size, size);
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h->Characteristics = IMAGE_SCN_MEM_READ|
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IMAGE_SCN_MEM_DISCARDABLE;
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chksectoff(h, cpos());
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fh.PointerToSymbolTable = cpos();
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fh.NumberOfSymbols = 1;
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strnput("", 18); // one empty symbol
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// put symbol string table
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lputl(size);
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// put COFF symbol table
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for (i=0; i<fh.NumberOfSymbols; i++) {
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s = rlookup(symlabels[i], 0);
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strnput(s->name, 8);
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lputl(datoff(s->value));
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wputl(textsect);
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wputl(0x0308); // "array of structs"
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cput(2); // storage class: external
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cput(0); // no aux entries
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}
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// put COFF string table
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lputl(nextsymoff + 4);
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for (i=0; i<nextsymoff; i++)
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cput(symnames[i]);
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strnput("", h->SizeOfRawData - size);
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@ -532,6 +547,7 @@ asmbpe(void)
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IMAGE_SCN_CNT_INITIALIZED_DATA|
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IMAGE_SCN_MEM_EXECUTE|IMAGE_SCN_MEM_READ;
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chksectseg(t, &segtext);
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textsect = nsect;
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d = addpesection(".data", segdata.len, segdata.filelen);
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d->Characteristics = IMAGE_SCN_CNT_INITIALIZED_DATA|
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@ -66,6 +66,7 @@ static int adotout(int, Fhdr*, ExecHdr*);
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static int elfdotout(int, Fhdr*, ExecHdr*);
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static int machdotout(int, Fhdr*, ExecHdr*);
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static int armdotout(int, Fhdr*, ExecHdr*);
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static int pedotout(int, Fhdr*, ExecHdr*);
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static void setsym(Fhdr*, vlong, int32, vlong, int32, vlong, int32);
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static void setdata(Fhdr*, uvlong, int32, vlong, int32);
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static void settext(Fhdr*, uvlong, uvlong, int32, vlong);
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@ -312,6 +313,15 @@ ExecTable exectab[] =
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sizeof(Exec),
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beswal,
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common },
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{ 0x4d5a9000, /* see dosstub[] in pe.c */
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"windows PE executable",
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nil,
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FWINPE,
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0,
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&mi386,
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sizeof(Exec), /* TODO */
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nil,
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pedotout },
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{ 0 },
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};
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@ -1249,6 +1259,164 @@ armdotout(int fd, Fhdr *fp, ExecHdr *hp)
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return 1;
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}
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/*
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* Structures needed to parse PE image.
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*/
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typedef struct {
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uint16 Machine;
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uint16 NumberOfSections;
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uint32 TimeDateStamp;
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uint32 PointerToSymbolTable;
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uint32 NumberOfSymbols;
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uint16 SizeOfOptionalHeader;
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uint16 Characteristics;
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} IMAGE_FILE_HEADER;
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typedef struct {
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uint8 Name[8];
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uint32 VirtualSize;
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uint32 VirtualAddress;
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uint32 SizeOfRawData;
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uint32 PointerToRawData;
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uint32 PointerToRelocations;
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uint32 PointerToLineNumbers;
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uint16 NumberOfRelocations;
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uint16 NumberOfLineNumbers;
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uint32 Characteristics;
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} IMAGE_SECTION_HEADER;
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typedef struct {
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uint32 VirtualAddress;
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uint32 Size;
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} IMAGE_DATA_DIRECTORY;
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typedef struct {
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uint16 Magic;
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uint8 MajorLinkerVersion;
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uint8 MinorLinkerVersion;
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uint32 SizeOfCode;
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uint32 SizeOfInitializedData;
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uint32 SizeOfUninitializedData;
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uint32 AddressOfEntryPoint;
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uint32 BaseOfCode;
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uint32 BaseOfData;
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uint32 ImageBase;
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uint32 SectionAlignment;
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uint32 FileAlignment;
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uint16 MajorOperatingSystemVersion;
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uint16 MinorOperatingSystemVersion;
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uint16 MajorImageVersion;
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uint16 MinorImageVersion;
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uint16 MajorSubsystemVersion;
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uint16 MinorSubsystemVersion;
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uint32 Win32VersionValue;
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uint32 SizeOfImage;
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uint32 SizeOfHeaders;
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uint32 CheckSum;
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uint16 Subsystem;
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uint16 DllCharacteristics;
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uint32 SizeOfStackReserve;
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uint32 SizeOfStackCommit;
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uint32 SizeOfHeapReserve;
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uint32 SizeOfHeapCommit;
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uint32 LoaderFlags;
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uint32 NumberOfRvaAndSizes;
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IMAGE_DATA_DIRECTORY DataDirectory[16];
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} IMAGE_OPTIONAL_HEADER;
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static int
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match8(void *buf, char *cmp)
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{
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return strncmp((char*)buf, cmp, 8) == 0;
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}
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/* TODO(czaplinski): 64b windows? */
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/*
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* Read from Windows PE/COFF .exe file image.
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*/
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static int
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pedotout(int fd, Fhdr *fp, ExecHdr *hp)
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{
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uint32 start, magic;
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uint32 symtab, esymtab;
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IMAGE_FILE_HEADER fh;
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IMAGE_SECTION_HEADER sh;
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IMAGE_OPTIONAL_HEADER oh;
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uint8 sym[18];
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uint32 *valp;
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int i;
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USED(hp);
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seek(fd, 0x3c, 0);
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if (readn(fd, &start, sizeof(start)) != sizeof(start)) {
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werrstr("crippled PE MSDOS header");
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return 0;
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}
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start = leswal(start);
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seek(fd, start, 0);
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if (readn(fd, &magic, sizeof(magic)) != sizeof(magic)) {
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werrstr("no PE magic number found");
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return 0;
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}
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if (beswal(magic) != 0x50450000) { /* "PE\0\0" */
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werrstr("incorrect PE magic number");
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return 0;
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}
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if (readn(fd, &fh, sizeof(fh)) != sizeof(fh)) {
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werrstr("crippled PE File Header");
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return 0;
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}
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if (fh.PointerToSymbolTable == 0) {
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werrstr("zero pointer to COFF symbol table");
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return 0;
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}
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if (readn(fd, &oh, sizeof(oh)) != sizeof(oh)) {
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werrstr("crippled PE Optional Header");
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return 0;
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}
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seek(fd, start+sizeof(magic)+sizeof(fh)+leswab(fh.SizeOfOptionalHeader), 0);
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fp->txtaddr = fp->dataddr = 0;
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for (i=0; i<leswab(fh.NumberOfSections); i++) {
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if (readn(fd, &sh, sizeof(sh)) != sizeof(sh)) {
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werrstr("could not read Section Header %d", i+1);
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return 0;
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}
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if (match8(sh.Name, ".text"))
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settext(fp, leswal(sh.VirtualAddress), leswal(oh.AddressOfEntryPoint), leswal(sh.VirtualSize), leswal(sh.PointerToRawData));
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if (match8(sh.Name, ".data"))
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setdata(fp, leswal(sh.VirtualAddress), leswal(sh.SizeOfRawData), leswal(sh.PointerToRawData), leswal(sh.VirtualSize)-leswal(sh.SizeOfRawData));
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}
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if (fp->txtaddr==0 || fp->dataddr==0) {
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werrstr("no .text or .data");
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return 0;
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}
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seek(fd, leswal(fh.PointerToSymbolTable), 0);
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symtab = esymtab = 0;
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for (i=0; i<leswal(fh.NumberOfSymbols); i++) {
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if (readn(fd, &sym, sizeof(sym)) != sizeof(sym)) {
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werrstr("crippled COFF symbol %d", i);
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return 0;
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}
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valp = (uint32 *)&sym[8];
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if (match8(sym, "symtab"))
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symtab = leswal(*valp);
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if (match8(sym, "esymtab"))
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esymtab = leswal(*valp);
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}
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if (symtab==0 || esymtab==0) {
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werrstr("no symtab or esymtab in COFF symbol table");
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return 0;
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}
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setsym(fp, symtab, esymtab-symtab, 0, 0, 0, 0);
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return 1;
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}
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static void
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settext(Fhdr *fp, uvlong e, uvlong a, int32 s, vlong off)
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{
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