/* -----------------------------------------------------------------------------
- * $Id: Linker.c,v 1.56 2001/08/13 14:34:40 simonmar Exp $
+ * $Id: Linker.c,v 1.62 2001/08/31 14:32:03 sewardj Exp $
*
- * (c) The GHC Team, 2000
+ * (c) The GHC Team, 2000, 2001
*
* RTS Object Linker
*
* ---------------------------------------------------------------------------*/
+#include "PosixSource.h"
#include "Rts.h"
#include "RtsFlags.h"
#include "HsFFI.h"
SymX(__gmpz_get_ui) \
SymX(prog_argv) \
SymX(prog_argc) \
+ SymX(getProgArgv) \
+ SymX(setProgArgv) \
SymX(resetNonBlockingFd) \
SymX(performGC) \
SymX(getStablePtr) \
char*
-addDLL ( char* path, char* dll_name )
+addDLL ( __attribute((unused)) char* path, char* dll_name )
{
# if defined(OBJFORMAT_ELF)
void *hdl;
oc->symbols = NULL;
oc->sections = NULL;
oc->lochash = allocStrHashTable();
+ oc->proddables = NULL;
/* chain it onto the list of objects */
oc->next = objects;
return 0;
}
+/* -----------------------------------------------------------------------------
+ * Sanity checking. For each ObjectCode, maintain a list of address ranges
+ * which may be prodded during relocation, and abort if we try and write
+ * outside any of these.
+ */
+static void addProddableBlock ( ObjectCode* oc, void* start, int size )
+{
+ ProddableBlock* pb
+ = stgMallocBytes(sizeof(ProddableBlock), "addProddableBlock");
+ /* fprintf(stderr, "aPB %p %p %d\n", oc, start, size); */
+ ASSERT(size > 0);
+ pb->start = start;
+ pb->size = size;
+ pb->next = oc->proddables;
+ oc->proddables = pb;
+}
+
+static void checkProddableBlock ( ObjectCode* oc, void* addr )
+{
+ ProddableBlock* pb;
+ for (pb = oc->proddables; pb != NULL; pb = pb->next) {
+ char* s = (char*)(pb->start);
+ char* e = s + pb->size - 1;
+ char* a = (char*)addr;
+ /* Assumes that the biggest fixup involves a 4-byte write. This
+ probably needs to be changed to 8 (ie, +7) on 64-bit
+ plats. */
+ if (a >= s && (a+3) <= e) return;
+ }
+ barf("checkProddableBlock: invalid fixup in runtime linker");
+}
+
+
/* --------------------------------------------------------------------------
* PEi386 specifics (Win32 targets)
* ------------------------------------------------------------------------*/
" data sz %d\n"
" data off %d\n"
" num rel %d\n"
- " off rel %d\n",
+ " off rel %d\n"
+ " ptr raw 0x%x\n",
sectab_i->VirtualSize,
sectab_i->VirtualAddress,
sectab_i->SizeOfRawData,
sectab_i->PointerToRawData,
sectab_i->NumberOfRelocations,
- sectab_i->PointerToRelocations
+ sectab_i->PointerToRelocations,
+ sectab_i->PointerToRawData
);
reltab = (COFF_reloc*) (
((UChar*)(oc->image)) + sectab_i->PointerToRelocations
printName ( sym->Name, strtab -10 );
fprintf ( stderr, "'\n" );
}
+
fprintf ( stderr, "\n" );
}
-
fprintf ( stderr, "\n" );
fprintf ( stderr, "string table has size 0x%x\n", * (UInt32*)strtab );
fprintf ( stderr, "---START of string table---\n");
fprintf ( stderr,
"'\n"
" value 0x%x\n"
- " sec# %d\n"
+ " 1+sec# %d\n"
" type 0x%x\n"
" sclass 0x%x\n"
" nAux %d\n",
symtab_i->Value,
- (Int32)(symtab_i->SectionNumber) - 1,
+ (Int32)(symtab_i->SectionNumber),
(UInt32)symtab_i->Type,
(UInt32)symtab_i->StorageClass,
(UInt32)symtab_i->NumberOfAuxSymbols
+ hdr->PointerToSymbolTable
+ hdr->NumberOfSymbols * sizeof_COFF_symbol;
+ /* Allocate space for any (local, anonymous) .bss sections. */
+
+ for (i = 0; i < hdr->NumberOfSections; i++) {
+ UChar* zspace;
+ COFF_section* sectab_i
+ = (COFF_section*)
+ myindex ( sizeof_COFF_section, sectab, i );
+ if (0 != strcmp(sectab_i->Name, ".bss")) continue;
+ if (sectab_i->VirtualSize == 0) continue;
+ /* This is a non-empty .bss section. Allocate zeroed space for
+ it, and set its PointerToRawData field such that oc->image +
+ PointerToRawData == addr_of_zeroed_space. */
+ zspace = stgCallocBytes(1, sectab_i->VirtualSize,
+ "ocGetNames_PEi386(anonymous bss)");
+ sectab_i->PointerToRawData = ((UChar*)zspace) - ((UChar*)(oc->image));
+ addProddableBlock(oc, zspace, sectab_i->VirtualSize);
+ /* fprintf(stderr, "BSS section at 0x%x\n", zspace); */
+ }
+
/* Copy exported symbols into the ObjectCode. */
oc->n_symbols = hdr->NumberOfSymbols;
symtab_i = (COFF_symbol*)
myindex ( sizeof_COFF_symbol, symtab, i );
- if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL &&
- symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
+ addr = NULL;
+ if (symtab_i->StorageClass == MYIMAGE_SYM_CLASS_EXTERNAL
+ && symtab_i->SectionNumber != MYIMAGE_SYM_UNDEFINED) {
/* This symbol is global and defined, viz, exported */
- COFF_section* sectabent;
-
- /* cstring_from_COFF_symbol_name always succeeds. */
- sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
-
/* for MYIMAGE_SYMCLASS_EXTERNAL
&& !MYIMAGE_SYM_UNDEFINED,
the address of the symbol is:
address of relevant section + offset in section
*/
- sectabent = (COFF_section*)
- myindex ( sizeof_COFF_section,
- sectab,
- symtab_i->SectionNumber-1 );
+ COFF_section* sectabent
+ = (COFF_section*) myindex ( sizeof_COFF_section,
+ sectab,
+ symtab_i->SectionNumber-1 );
addr = ((UChar*)(oc->image))
+ (sectabent->PointerToRawData
+ symtab_i->Value);
+ }
+ else
+ if (symtab_i->SectionNumber == MYIMAGE_SYM_UNDEFINED
+ && symtab_i->Value > 0) {
+ /* This symbol isn't in any section at all, ie, global bss.
+ Allocate zeroed space for it. */
+ addr = stgCallocBytes(1, symtab_i->Value,
+ "ocGetNames_PEi386(non-anonymous bss)");
+ addProddableBlock(oc, addr, symtab_i->Value);
+ }
+
+ if (addr != NULL) {
+ sname = cstring_from_COFF_symbol_name ( symtab_i->Name, strtab );
/* fprintf(stderr,"addSymbol %p `%s'\n", addr,sname); */
IF_DEBUG(linker, belch("addSymbol %p `%s'\n", addr,sname);)
ASSERT(i >= 0 && i < oc->n_symbols);
+ /* cstring_from_COFF_symbol_name always succeeds. */
oc->symbols[i] = sname;
insertStrHashTable(symhash, sname, addr);
+ } else {
+# if 0
+ fprintf ( stderr,
+ "IGNORING symbol %d\n"
+ " name `",
+ i
+ );
+ printName ( symtab_i->Name, strtab );
+ fprintf ( stderr,
+ "'\n"
+ " value 0x%x\n"
+ " 1+sec# %d\n"
+ " type 0x%x\n"
+ " sclass 0x%x\n"
+ " nAux %d\n",
+ symtab_i->Value,
+ (Int32)(symtab_i->SectionNumber),
+ (UInt32)symtab_i->Type,
+ (UInt32)symtab_i->StorageClass,
+ (UInt32)symtab_i->NumberOfAuxSymbols
+ );
+# endif
}
+
i += symtab_i->NumberOfAuxSymbols;
i++;
}
myindex ( sizeof_COFF_section, sectab, i );
IF_DEBUG(linker, belch("section name = %s\n", sectab_i->Name ));
-#if 0
+# if 0
/* I'm sure this is the Right Way to do it. However, the
alternative of testing the sectab_i->Name field seems to
work ok with Cygwin.
if (sectab_i->Characteristics & MYIMAGE_SCN_CNT_CODE ||
sectab_i->Characteristics & MYIMAGE_SCN_CNT_INITIALIZED_DATA)
kind = SECTIONKIND_CODE_OR_RODATA;
-#endif
+# endif
if (0==strcmp(".text",sectab_i->Name) ||
0==strcmp(".rodata",sectab_i->Name))
return 0;
}
- oc->sections[i].start = start;
- oc->sections[i].end = end;
- oc->sections[i].kind = kind;
+ if (end >= start) {
+ oc->sections[i].start = start;
+ oc->sections[i].end = end;
+ oc->sections[i].kind = kind;
+ addProddableBlock(oc, start, end - start + 1);
+ }
}
return 1;
return 0;
}
}
-
+ checkProddableBlock(oc, pP);
switch (reltab_j->Type) {
case MYIMAGE_REL_I386_DIR32:
*pP = A + S;
/* make a section entry for relevant sections */
SectionKind kind = SECTIONKIND_OTHER;
if (!strcmp(".data",sh_strtab+shdr[i].sh_name) ||
- !strcmp(".data1",sh_strtab+shdr[i].sh_name))
+ !strcmp(".data1",sh_strtab+shdr[i].sh_name) ||
+ !strcmp(".bss",sh_strtab+shdr[i].sh_name))
kind = SECTIONKIND_RWDATA;
if (!strcmp(".text",sh_strtab+shdr[i].sh_name) ||
!strcmp(".rodata",sh_strtab+shdr[i].sh_name) ||
!strcmp(".rodata1",sh_strtab+shdr[i].sh_name))
kind = SECTIONKIND_CODE_OR_RODATA;
+ if (!strcmp(".bss",sh_strtab+shdr[i].sh_name) && shdr[i].sh_size > 0) {
+ /* This is a non-empty .bss section. Allocate zeroed space for
+ it, and set its .sh_offset field such that
+ ehdrC + .sh_offset == addr_of_zeroed_space. */
+ char* zspace = stgCallocBytes(1, shdr[i].sh_size,
+ "ocGetNames_ELF(anonymous bss)");
+ shdr[i].sh_offset = ((char*)zspace) - ((char*)ehdrC);
+ /* We don't prod BSS sections, hence the following isn't
+ necessary:
+ addProddableBlock(oc, zspace, shdr[i].sh_size);
+ */
+ /*
+ fprintf(stderr, "BSS section at 0x%x, size %d\n",
+ zspace, shdr[i].sh_size);
+ */
+ }
+
/* fill in the section info */
oc->sections[i].start = ehdrC + shdr[i].sh_offset;
oc->sections[i].end = ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1;
oc->sections[i].kind = kind;
-
+ if (kind != SECTIONKIND_OTHER && shdr[i].sh_size > 0)
+ addProddableBlock(oc, ehdrC + shdr[i].sh_offset, shdr[i].sh_size);
+
if (shdr[i].sh_type != SHT_SYMTAB) continue;
/* copy stuff into this module's object symbol table */
ELF32_ST_TYPE(stab[j].st_info)==STT_OBJECT ||
ELF32_ST_TYPE(stab[j].st_info)==STT_NOTYPE
)
- ) {
- char* nm = strtab + stab[j].st_name;
- char* ad = ehdrC
- + shdr[ stab[j].st_shndx ].sh_offset
- + stab[j].st_value;
+ ) {
+ char* nm;
+ char* ad;
+ int secno = stab[j].st_shndx;
+ /* Section 0 is the undefined section, hence > and not >=. */
+ ASSERT(secno > 0 && secno < ehdr->e_shnum);
+ nm = strtab + stab[j].st_name;
+ /*
+ if (shdr[secno].sh_type == SHT_NOBITS) {
+ fprintf(stderr, "bss symbol, size %d off %d name %s\n",
+ stab[j].st_size, stab[j].st_value, nm);
+ }
+ */
+ ad = ehdrC + shdr[ secno ].sh_offset + stab[j].st_value;
ASSERT(nm != NULL);
ASSERT(ad != NULL);
oc->symbols[j] = nm;
}
IF_DEBUG(linker,belch( "Reloc: P = %p S = %p A = %p",
(void*)P, (void*)S, (void*)A ));
+ checkProddableBlock ( oc, pP );
switch (ELF32_R_TYPE(info)) {
# ifdef i386_TARGET_ARCH
case R_386_32: *pP = S + A; break;
}
IF_DEBUG(linker,fprintf ( stderr, "Reloc: P = %p S = %p A = %p\n",
(void*)P, (void*)S, (void*)A ));
+ checkProddableBlock ( oc, P );
switch (ELF32_R_TYPE(info)) {
# if defined(sparc_TARGET_ARCH)
case R_SPARC_WDISP30:
w1 |= w2;
*pP = w1;
break;
+ /* According to the Sun documentation:
+ R_SPARC_UA32
+ This relocation type resembles R_SPARC_32, except it refers to an
+ unaligned word. That is, the word to be relocated must be treated
+ as four separate bytes with arbitrary alignment, not as a word
+ aligned according to the architecture requirements.
+
+ (JRS: which means that freeloading on the R_SPARC_32 case
+ is probably wrong, but hey ...)
+ */
+ case R_SPARC_UA32:
case R_SPARC_32:
w2 = (Elf32_Word)(S + A);
*pP = w2;
projects / ghc-hetmet.git / blobdiff