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ld: remove cseekend and redo pe writing

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Simplify code and add more checks.

Fixes #2105.

R=rsc
CC=golang-dev
https://golang.org/cl/4794060
This commit is contained in:
Alex Brainman 2011-07-28 14:30:52 +10:00
parent 5a52c6ad29
commit fa249cae38
3 changed files with 51 additions and 49 deletions
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6
src/cmd/ld/lib.c
View File

@ -1415,9 +1415,3 @@ cwrite(void *buf, int n)
}
coutpos += n;
}
void
cseekend(void)
{
seek(cout, 0, 2);
}

1
src/cmd/ld/lib.h
View File

@ -302,7 +302,6 @@ EXTERN char* cbpmax;
void cflush(void);
vlong cpos(void);
void cseek(vlong);
void cseekend(void);
void cwrite(void*, int);
void importcycles(void);
int Zconv(Fmt*);

93
src/cmd/ld/pe.c
View File

@ -76,7 +76,7 @@ static Sym *dexport[1024];
static int nexport;
static IMAGE_SECTION_HEADER*
addpesection(char *name, int sectsize, int filesize, Segment *s)
addpesection(char *name, int sectsize, int filesize)
{
IMAGE_SECTION_HEADER *h;
@ -94,19 +94,31 @@ addpesection(char *name, int sectsize, int filesize, Segment *s)
h->SizeOfRawData = rnd(filesize, PEFILEALIGN);
nextfileoff += h->SizeOfRawData;
}
if(s) {
if(s->vaddr-PEBASE != h->VirtualAddress) {
diag("%s.VirtualAddress = %#llux, want %#llux", name, (vlong)h->VirtualAddress, (vlong)(s->vaddr-PEBASE));
errorexit();
}
if(s->fileoff != h->PointerToRawData) {
diag("%s.PointerToRawData = %#llux, want %#llux", name, (vlong)h->PointerToRawData, (vlong)(s->fileoff));
errorexit();
}
}
return h;
}
static void
chksectoff(IMAGE_SECTION_HEADER *h, vlong off)
{
if(off != h->PointerToRawData) {
diag("%s.PointerToRawData = %#llux, want %#llux", h->Name, (vlong)h->PointerToRawData, off);
errorexit();
}
}
static void
chksectseg(IMAGE_SECTION_HEADER *h, Segment *s)
{
if(s->vaddr-PEBASE != h->VirtualAddress) {
diag("%s.VirtualAddress = %#llux, want %#llux", h->Name, (vlong)h->VirtualAddress, (vlong)(s->vaddr-PEBASE));
errorexit();
}
if(s->fileoff != h->PointerToRawData) {
diag("%s.PointerToRawData = %#llux, want %#llux", h->Name, (vlong)h->PointerToRawData, (vlong)(s->fileoff));
errorexit();
}
}
void
peinit(void)
{
@ -138,7 +150,6 @@ pewrite(void)
cseek(0);
cwrite(dosstub, sizeof dosstub);
strnput("PE", 4);
cflush();
// TODO: This code should not assume that the
// memory representation is little-endian or
// that the structs are packed identically to
@ -213,39 +224,41 @@ initdynimport(void)
}
static void
addimports(vlong fileoff, IMAGE_SECTION_HEADER *datsect)
addimports(IMAGE_SECTION_HEADER *datsect)
{
IMAGE_SECTION_HEADER *isect;
uvlong n, oftbase, ftbase;
vlong startoff, endoff;
Imp *m;
Dll *d;
Sym* dynamic;
startoff = cpos();
dynamic = lookup(".windynamic", 0);
// skip import descriptor table (will write it later)
n = 0;
for(d = dr; d != nil; d = d->next)
n++;
cseek(fileoff + sizeof(IMAGE_IMPORT_DESCRIPTOR) * (n + 1));
cseek(startoff + sizeof(IMAGE_IMPORT_DESCRIPTOR) * (n + 1));
// write dll names
for(d = dr; d != nil; d = d->next) {
d->nameoff = cpos() - fileoff;
d->nameoff = cpos() - startoff;
strput(d->name);
}
// write function names
for(d = dr; d != nil; d = d->next) {
for(m = d->ms; m != nil; m = m->next) {
m->off = nextsectoff + cpos() - fileoff;
m->off = nextsectoff + cpos() - startoff;
wputl(0); // hint
strput(m->s->dynimpname);
}
}
// write OriginalFirstThunks
oftbase = cpos() - fileoff;
oftbase = cpos() - startoff;
n = cpos();
for(d = dr; d != nil; d = d->next) {
d->thunkoff = cpos() - n;
@ -255,12 +268,13 @@ addimports(vlong fileoff, IMAGE_SECTION_HEADER *datsect)
}
// add pe section and pad it at the end
n = cpos() - fileoff;
isect = addpesection(".idata", n, n, 0);
n = cpos() - startoff;
isect = addpesection(".idata", n, n);
isect->Characteristics = IMAGE_SCN_CNT_INITIALIZED_DATA|
IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE;
chksectoff(isect, startoff);
strnput("", isect->SizeOfRawData - n);
cflush();
endoff = cpos();
// write FirstThunks (allocated in .data section)
ftbase = dynamic->value - datsect->VirtualAddress - PEBASE;
@ -270,10 +284,9 @@ addimports(vlong fileoff, IMAGE_SECTION_HEADER *datsect)
put(m->off);
put(0);
}
cflush();
// finally write import descriptor table
cseek(fileoff);
cseek(startoff);
for(d = dr; d != nil; d = d->next) {
lputl(isect->VirtualAddress + oftbase + d->thunkoff);
lputl(0);
@ -286,7 +299,6 @@ addimports(vlong fileoff, IMAGE_SECTION_HEADER *datsect)
lputl(0);
lputl(0);
lputl(0);
cflush();
// update data directory
dd[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress = isect->VirtualAddress;
@ -294,7 +306,7 @@ addimports(vlong fileoff, IMAGE_SECTION_HEADER *datsect)
dd[IMAGE_DIRECTORY_ENTRY_IAT].VirtualAddress = dynamic->value - PEBASE;
dd[IMAGE_DIRECTORY_ENTRY_IAT].Size = dynamic->size;
cseekend();
cseek(endoff);
}
static int
@ -329,7 +341,7 @@ initdynexport(void)
}
void
addexports(vlong fileoff)
addexports(void)
{
IMAGE_SECTION_HEADER *sect;
IMAGE_EXPORT_DIRECTORY e;
@ -342,13 +354,13 @@ addexports(vlong fileoff)
if (nexport == 0)
return;
sect = addpesection(".edata", size, size, 0);
sect = addpesection(".edata", size, size);
sect->Characteristics = IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ;
chksectoff(sect, cpos());
va = sect->VirtualAddress;
dd[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress = va;
dd[IMAGE_DIRECTORY_ENTRY_EXPORT].Size = sect->VirtualSize;
cseek(fileoff);
va_name = va + sizeof e + nexport*4;
va_addr = va + sizeof e;
va_na = va + sizeof e + nexport*8;
@ -383,9 +395,6 @@ addexports(vlong fileoff)
for(i=0; i<nexport; i++)
strnput(dexport[i]->dynimpname, strlen(dexport[i]->dynimpname)+1);
strnput("", sect->SizeOfRawData - size);
cflush();
cseekend();
}
void
@ -428,7 +437,7 @@ newPEDWARFSection(char *name, vlong size)
nextsymoff += strlen(name);
symnames[nextsymoff] = 0;
nextsymoff ++;
h = addpesection(s, size, size, 0);
h = addpesection(s, size, size);
h->Characteristics = IMAGE_SCN_MEM_READ|
IMAGE_SCN_MEM_DISCARDABLE;
@ -445,9 +454,10 @@ addsymtable(void)
return;
size = nextsymoff + 4;
h = addpesection(".symtab", size, size, 0);
h = addpesection(".symtab", size, size);
h->Characteristics = IMAGE_SCN_MEM_READ|
IMAGE_SCN_MEM_DISCARDABLE;
chksectoff(h, cpos());
fh.PointerToSymbolTable = cpos();
fh.NumberOfSymbols = 0;
// put symbol string table
@ -455,7 +465,6 @@ addsymtable(void)
for (i=0; i<nextsymoff; i++)
cput(symnames[i]);
strnput("", h->SizeOfRawData - size);
cflush();
}
void
@ -478,9 +487,10 @@ addpersrc(void)
if(rsrcsym == nil)
return;
h = addpesection(".rsrc", rsrcsym->size, rsrcsym->size, 0);
h = addpesection(".rsrc", rsrcsym->size, rsrcsym->size);
h->Characteristics = IMAGE_SCN_MEM_READ|
IMAGE_SCN_MEM_WRITE | IMAGE_SCN_CNT_INITIALIZED_DATA;
chksectoff(h, cpos());
// relocation
for(r=rsrcsym->r; r<rsrcsym->r+rsrcsym->nr; r++) {
p = rsrcsym->p + r->off;
@ -493,7 +503,6 @@ addpersrc(void)
}
cwrite(rsrcsym->p, rsrcsym->size);
strnput("", h->SizeOfRawData - rsrcsym->size);
cflush();
// update data directory
dd[IMAGE_DIRECTORY_ENTRY_RESOURCE].VirtualAddress = h->VirtualAddress;
@ -517,24 +526,24 @@ asmbpe(void)
break;
}
t = addpesection(".text", segtext.len, segtext.len, &segtext);
t = addpesection(".text", segtext.len, segtext.len);
t->Characteristics = IMAGE_SCN_CNT_CODE|
IMAGE_SCN_CNT_INITIALIZED_DATA|
IMAGE_SCN_MEM_EXECUTE|IMAGE_SCN_MEM_READ;
chksectseg(t, &segtext);
d = addpesection(".data", segdata.len, segdata.filelen, &segdata);
d = addpesection(".data", segdata.len, segdata.filelen);
d->Characteristics = IMAGE_SCN_CNT_INITIALIZED_DATA|
IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE;
chksectseg(d, &segdata);
if(!debug['s'])
dwarfaddpeheaders();
addimports(nextfileoff, d);
addexports(nextfileoff);
cseek(nextfileoff);
addimports(d);
addexports();
addsymtable();
addpersrc();
fh.NumberOfSections = nsect;