8l: emit resources (.rsrc) in Windows PE.

R=alex.brainman, rsc
CC=golang-dev, vcc.163
https://golang.org/cl/4516055

src/cmd/ld/ldpe.c

@@ -147,7 +147,7 @@ ldpe(Biobuf *f, char *pkg, int64 len, char *pn)
 			goto bad;
 		obj->sect[i].size = obj->sect[i].sh.SizeOfRawData;
 		obj->sect[i].name = (char*)obj->sect[i].sh.Name;
-		// TODO return error if found .cormeta .rsrc
+		// TODO return error if found .cormeta
 	}
 	// load string table
 	Bseek(f, base+obj->fh.PointerToSymbolTable+18*obj->fh.NumberOfSymbols, 0);
@@ -222,6 +222,8 @@ ldpe(Biobuf *f, char *pkg, int64 len, char *pn)
 			etextp = s;
 		}
 		sect->sym = s;
+		if(strcmp(sect->name, ".rsrc") == 0)
+			setpersrc(sect->sym);
 	}
 	
 	// load relocations
@@ -259,6 +261,7 @@ ldpe(Biobuf *f, char *pkg, int64 len, char *pn)
 					rp->type = D_PCREL;
 					rp->add = 0;
 					break;
+				case IMAGE_REL_I386_DIR32NB:
 				case IMAGE_REL_I386_DIR32:
 					rp->type = D_ADDR;
 					// load addend from image

src/cmd/ld/pe.c

@@ -34,6 +34,8 @@ static char dosstub[] =
 	0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
 };
 
+static Sym *rsrcsym;
+
 static char symnames[256]; 
 static int  nextsymoff;
 
@@ -458,6 +460,48 @@ addsymtable(void)
 	cflush();
 }
 
+void
+setpersrc(Sym *sym)
+{
+	if(rsrcsym != nil)
+		diag("too many .rsrc sections");
+	
+	rsrcsym = sym;
+}
+
+void
+addpersrc(void)
+{
+	IMAGE_SECTION_HEADER *h;
+	uchar *p;
+	uint32 val;
+	Reloc *r;
+
+	if(rsrcsym == nil)
+		return;
+	
+	h = addpesection(".rsrc", rsrcsym->size, rsrcsym->size, 0);
+	h->Characteristics = IMAGE_SCN_MEM_READ|
+		IMAGE_SCN_MEM_WRITE | IMAGE_SCN_CNT_INITIALIZED_DATA;
+	// relocation
+	for(r=rsrcsym->r; r<rsrcsym->r+rsrcsym->nr; r++) {
+		p = rsrcsym->p + r->off;
+		val = h->VirtualAddress + r->add;
+		// 32-bit little-endian
+		p[0] = val;
+		p[1] = val>>8;
+		p[2] = val>>16;
+		p[3] = val>>24;
+	}
+	ewrite(cout, rsrcsym->p, rsrcsym->size);
+	strnput("", h->SizeOfRawData - rsrcsym->size);
+	cflush();
+
+	// update data directory
+	dd[IMAGE_DIRECTORY_ENTRY_RESOURCE].VirtualAddress = h->VirtualAddress;
+	dd[IMAGE_DIRECTORY_ENTRY_RESOURCE].Size = h->VirtualSize;
+}
+
 void
 asmbpe(void)
 {
@@ -493,6 +537,8 @@ asmbpe(void)
 	
 	addsymtable();
 	
+	addpersrc();
+	
 	fh.NumberOfSections = nsect;
 	fh.TimeDateStamp = time(0);
 	fh.Characteristics = IMAGE_FILE_RELOCS_STRIPPED|

src/cmd/ld/pe.h

@@ -175,3 +175,5 @@ typedef struct {
 	uint32 NumberOfRvaAndSizes;
 	IMAGE_DATA_DIRECTORY DataDirectory[16];
 } PE64_IMAGE_OPTIONAL_HEADER;
+
+void setpersrc(Sym *sym);