/* -----------------------------------------------------------------------------
- * $Id: Linker.c,v 1.144 2004/01/05 17:32:35 simonmar Exp $
+ * $Id: Linker.c,v 1.145 2004/02/15 13:29:44 krasimir Exp $
*
* (c) The GHC Team, 2000-2003
*
#define RTS_MINGW_ONLY_SYMBOLS /**/
/* Don't have the ability to read import libs / archives, so
* we have to stupidly list a lot of what libcygwin.a
- * exports; sigh.
+ * exports; sigh.
*/
#define RTS_CYGWIN_ONLY_SYMBOLS \
SymX(regfree) \
#if __GNUC__>=3
#define RTS_MINGW_EXTRA_SYMS \
Sym(_imp____mb_cur_max) \
- Sym(_imp___pctype)
+ Sym(_imp___pctype)
#else
#define RTS_MINGW_EXTRA_SYMS
#endif
SymX(stg_block_takemvar) \
SymX(stg_block_putmvar) \
SymX(stg_seq_frame_info) \
- SymX(ErrorHdrHook) \
MAIN_CAP_SYM \
SymX(MallocFailHook) \
SymX(OnExitHook) \
SymX(OutOfHeapHook) \
- SymX(PatErrorHdrHook) \
- SymX(PostTraceHook) \
- SymX(PreTraceHook) \
SymX(StackOverflowHook) \
SymX(__encodeDouble) \
SymX(__encodeFloat) \
# endif
# if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
-# if defined(RTLD_DEFAULT)
+# if defined(RTLD_DEFAULT)
dl_prog_handle = RTLD_DEFAULT;
# else
dl_prog_handle = dlopen(NULL, RTLD_LAZY);
* to give to loadSymbol, so that we can find the symbols. For such
* libraries, the LoadLibrary call should be a no-op except for returning
* the handle.
- *
+ *
*/
#if defined(OBJFORMAT_PEi386)
ASSERT(symhash != NULL);
ASSERT(objects != NULL);
- initLinker();
+ initLinker();
prev = NULL;
for (oc = objects; oc; prev = oc, oc = oc->next) {
*
* See Section 4.1 (last para) of the PE spec (rev6.0).
*
- * Nov2003 update: the GNU linker still doesn't correctly
- * handle the generation of relocatable object files with
- * overflown relocations. Hence the output to warn of potential
+ * Nov2003 update: the GNU linker still doesn't correctly
+ * handle the generation of relocatable object files with
+ * overflown relocations. Hence the output to warn of potential
* troubles.
*/
COFF_reloc* rel = (COFF_reloc*)
/*
Support for MachO linking on Darwin/MacOS X on PowerPC chips
by Wolfgang Thaller (wolfgang.thaller@gmx.net)
-
+
I hereby formally apologize for the hackish nature of this code.
Things that need to be done:
*) implement ocVerifyImage_MachO
/*
ocAllocateJumpIslands_MachO
-
+
Allocate additional space at the end of the object file image to make room
for jump islands.
-
+
PowerPC relative branch instructions have a 24 bit displacement field.
As PPC code is always 4-byte-aligned, this yields a +-32MB range.
If a particular imported symbol is outside this range, we have to redirect
unsigned long nundefsym = dsymLC->nundefsym;
oc->island_start_symbol = dsymLC->iundefsym;
oc->n_islands = nundefsym;
-
+
if(nundefsym > 0)
{
#ifdef USE_MMAP
oc->image = stgReallocBytes(
image, oc->fileSize + islandSize * nundefsym,
"ocAllocateJumpIslands_MachO");
-#endif
+#endif
oc->jump_islands = oc->image + oc->fileSize;
memset(oc->jump_islands, 0, islandSize * nundefsym);
}
-
+
break; // there can be only one LC_DSYMTAB
}
lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
struct nlist *nlist)
{
unsigned i;
-
+
for(i=0;i*4<sect->size;i++)
{
// according to otool, reserved1 contains the first index into the indirect symbol table
struct nlist *symbol = &nlist[indirectSyms[sect->reserved1+i]];
char *nm = image + symLC->stroff + symbol->n_un.n_strx;
void *addr = NULL;
-
+
if((symbol->n_type & N_TYPE) == N_UNDF
&& (symbol->n_type & N_EXT) && (symbol->n_value != 0))
addr = (void*) (symbol->n_value);
checkProddableBlock(oc,((void**)(image + sect->offset)) + i);
((void**)(image + sect->offset))[i] = addr;
}
-
+
return 1;
}
symbolNumber - oc->island_start_symbol > oc->n_islands)
return NULL;
symbolNumber -= oc->island_start_symbol;
-
+
void *island = (void*) ((char*)oc->jump_islands + islandSize * symbolNumber);
unsigned long *p = (unsigned long*) island;
-
+
// lis r12, hi16(target)
*p++ = 0x3d800000 | ( ((unsigned long) target) >> 16 );
// ori r12, r12, lo16(target)
- *p++ = 0x618c0000 | ( ((unsigned long) target) & 0xFFFF );
+ *p++ = 0x618c0000 | ( ((unsigned long) target) & 0xFFFF );
// mtctr r12
*p++ = 0x7d8903a6;
// bctr
*p++ = 0x4e800420;
-
+
return (void*) island;
}
int nSections,
struct section* sections,
unsigned long address)
-{
+{
int i;
for(i = 0; i < nSections; i++)
{
static int relocateSection(
ObjectCode* oc,
- char *image,
+ char *image,
struct symtab_command *symLC, struct nlist *nlist,
int nSections, struct section* sections, struct section *sect)
{
struct relocation_info *relocs;
int i,n;
-
+
if(!strcmp(sect->sectname,"__la_symbol_ptr"))
return 1;
else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
n = sect->nreloc;
relocs = (struct relocation_info*) (image + sect->reloff);
-
+
for(i=0;i<n;i++)
{
if(relocs[i].r_address & R_SCATTERED)
{
struct scattered_relocation_info *scat =
(struct scattered_relocation_info*) &relocs[i];
-
+
if(!scat->r_pcrel)
{
if(scat->r_length == 2)
unsigned long word = 0;
unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
checkProddableBlock(oc,wordPtr);
-
+
// Step 1: Figure out what the relocated value should be
if(scat->r_type == GENERIC_RELOC_VANILLA)
{
{
struct scattered_relocation_info *pair =
(struct scattered_relocation_info*) &relocs[i+1];
-
+
if(!pair->r_scattered || pair->r_type != PPC_RELOC_PAIR)
barf("Invalid Mach-O file: "
"PPC_RELOC_*_SECTDIFF not followed by PPC_RELOC_PAIR");
-
+
word = (unsigned long)
(relocateAddress(oc, nSections, sections, scat->r_value)
- relocateAddress(oc, nSections, sections, pair->r_value));
}
}
}
-
+
continue; // FIXME: I hope it's OK to ignore all the others.
}
else
struct relocation_info *reloc = &relocs[i];
if(reloc->r_pcrel && !reloc->r_extern)
continue;
-
+
if(reloc->r_length == 2)
{
unsigned long word = 0;
unsigned long jumpIsland = 0;
long offsetToJumpIsland;
-
+
unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
checkProddableBlock(oc,wordPtr);
-
+
if(reloc->r_type == GENERIC_RELOC_VANILLA)
{
word = *wordPtr;
if(!reloc->r_extern)
{
- long delta =
+ long delta =
sections[reloc->r_symbolnum-1].offset
- sections[reloc->r_symbolnum-1].addr
+ ((long) image);
-
+
word += delta;
}
else
belch("\nunknown symbol `%s'", nm);
return 0;
}
-
+
if(reloc->r_pcrel)
{
jumpIsland = (long) makeJumpIsland(oc,reloc->r_symbolnum,(void*)word);
}
}
}
-
+
if(reloc->r_type == GENERIC_RELOC_VANILLA)
{
*wordPtr = word;
if(jumpIsland == 0)
barf("unconditional relative branch out of range: "
"no jump island available");
-
+
word = offsetToJumpIsland;
if((long)word > (long)0x01FFFFFF || (long)word < (long)0xFFE00000)
barf("unconditional relative branch out of range: "
lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
}
- sections = (struct section*) (segLC+1);
+ sections = (struct section*) (segLC+1);
nlist = (struct nlist*) (image + symLC->symoff);
for(i=0;i<segLC->nsects;i++)
{
if(sections[i].size == 0)
continue;
-
+
if((sections[i].flags & SECTION_TYPE) == S_ZEROFILL)
{
char * zeroFillArea = stgCallocBytes(1,sections[i].size,
"ocGetNames_MachO(common symbols)");
sections[i].offset = zeroFillArea - image;
}
-
+
if(!strcmp(sections[i].sectname,"__text"))
- addSection(oc, SECTIONKIND_CODE_OR_RODATA,
+ addSection(oc, SECTIONKIND_CODE_OR_RODATA,
(void*) (image + sections[i].offset),
(void*) (image + sections[i].offset + sections[i].size));
else if(!strcmp(sections[i].sectname,"__const"))
- addSection(oc, SECTIONKIND_RWDATA,
+ addSection(oc, SECTIONKIND_RWDATA,
(void*) (image + sections[i].offset),
(void*) (image + sections[i].offset + sections[i].size));
else if(!strcmp(sections[i].sectname,"__data"))
- addSection(oc, SECTIONKIND_RWDATA,
+ addSection(oc, SECTIONKIND_RWDATA,
(void*) (image + sections[i].offset),
(void*) (image + sections[i].offset + sections[i].size));
else if(!strcmp(sections[i].sectname,"__bss")
|| !strcmp(sections[i].sectname,"__common"))
- addSection(oc, SECTIONKIND_RWDATA,
+ addSection(oc, SECTIONKIND_RWDATA,
(void*) (image + sections[i].offset),
(void*) (image + sections[i].offset + sections[i].size));
}
oc->symbols = stgMallocBytes(oc->n_symbols * sizeof(char*),
"ocGetNames_MachO(oc->symbols)");
-
+
// insert symbols into hash table
for(i=dsymLC->iextdefsym,curSymbol=0;i<dsymLC->iextdefsym+dsymLC->nextdefsym;i++)
{
if((nlist[i].n_type & N_TYPE) == N_SECT)
{
char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
- ghciInsertStrHashTable(oc->fileName, symhash, nm, image +
+ ghciInsertStrHashTable(oc->fileName, symhash, nm, image +
sections[nlist[i].n_sect-1].offset
- sections[nlist[i].n_sect-1].addr
+ nlist[i].n_value);
oc->symbols[curSymbol++] = nm;
}
}
-
+
// insert local symbols into lochash
for(i=dsymLC->ilocalsym;i<dsymLC->ilocalsym+dsymLC->nlocalsym;i++)
{
if((nlist[i].n_type & N_TYPE) == N_SECT)
{
char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
- ghciInsertStrHashTable(oc->fileName, oc->lochash, nm, image +
+ ghciInsertStrHashTable(oc->fileName, oc->lochash, nm, image +
sections[nlist[i].n_sect-1].offset
- sections[nlist[i].n_sect-1].addr
+ nlist[i].n_value);
}
}
-
+
commonStorage = stgCallocBytes(1,commonSize,"ocGetNames_MachO(common symbols)");
commonCounter = (unsigned long)commonStorage;
for(i=0;i<symLC->nsyms;i++)
{
char *nm = image + symLC->stroff + nlist[i].n_un.n_strx;
unsigned long sz = nlist[i].n_value;
-
+
nlist[i].n_value = commonCounter;
-
+
ghciInsertStrHashTable(oc->fileName, symhash, nm, (void*)commonCounter);
oc->symbols[curSymbol++] = nm;
-
+
commonCounter += sz;
}
}
dsymLC = (struct dysymtab_command*) lc;
lc = (struct load_command *) ( ((char*)lc) + lc->cmdsize );
}
-
- sections = (struct section*) (segLC+1);
+
+ sections = (struct section*) (segLC+1);
nlist = (struct nlist*) (image + symLC->symoff);
for(i=0;i<segLC->nsects;i++)
else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr"))
nl_ptrs = §ions[i];
}
-
+
indirectSyms = (unsigned long*) (image + dsymLC->indirectsymoff);
if(la_ptrs)
if(nl_ptrs)
if(!resolveImports(oc,image,symLC,nl_ptrs,indirectSyms,nlist))
return 0;
-
+
for(i=0;i<segLC->nsects;i++)
{
if(!relocateSection(oc,image,symLC,nlist,segLC->nsects,sections,§ions[i]))
/* Free the local symbol table; we won't need it again. */
freeHashTable(oc->lochash, NULL);
oc->lochash = NULL;
-
+
/*
Flush the data & instruction caches.
Because the PPC has split data/instruction caches, we have to
{
void *p;
-#undef Sym
+#undef Sym
#define Sym(x) \
__asm__ ("lis %0,hi16(" #x ")\n\tori %0,%0,lo16(" #x ")" : "=r" (p)); \
ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, #x, p);
-
+
RTS_MACHO_NOUNDERLINE_SYMBOLS
}
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