/* -----------------------------------------------------------------------------
- * $Id: Linker.c,v 1.8 2001/01/15 16:55:25 sewardj Exp $
+ * $Id: Linker.c,v 1.21 2001/02/11 13:13:37 simonmar Exp $
*
* (c) The GHC Team, 2000
*
#include "Hash.h"
#include "Linker.h"
#include "RtsUtils.h"
+#include "StoragePriv.h"
-/* These two are POSIX headers */
+#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
+#endif
+
+#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
+#endif
-/* ToDo: configure this */
+#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
+#endif
#ifdef GHCI /* endif is right at end of file */
+#if defined(linux_TARGET_OS) || defined(solaris2_TARGET_OS) || defined(freebsd_TARGET_OS)
+#define OBJFORMAT_ELF
+#elif defined(cygwin32_TARGET_OS) || defined (mingw32_TARGET_OS)
+#define OBJFORMAT_PEi386
+#endif
+
/* A bucket in the symbol hash-table. Primarily, maps symbol names to
* absolute addresses. All symbols from a given module are linked
* together, so they can be freed at the same time. There's also a
/* List of currently loaded objects */
ObjectCode *objects;
-#if defined(linux_TARGET_OS) || defined(solaris2_TARGET_OS)
+#if defined(OBJFORMAT_ELF)
static int ocVerifyImage_ELF ( ObjectCode* oc );
static int ocGetNames_ELF ( ObjectCode* oc );
static int ocResolve_ELF ( ObjectCode* oc );
-#elif defined(cygwin32_TARGET_OS)
+#elif defined(OBJFORMAT_PEi386)
static int ocVerifyImage_PEi386 ( ObjectCode* oc );
static int ocGetNames_PEi386 ( ObjectCode* oc );
static int ocResolve_PEi386 ( ObjectCode* oc );
SymX(stg_sel_10_upd_info) \
SymX(stg_sel_11_upd_info) \
SymX(stg_sel_12_upd_info) \
+ SymX(stg_sel_13_upd_info) \
+ SymX(stg_sel_14_upd_info) \
+ SymX(stg_sel_15_upd_info) \
SymX(stg_upd_frame_info) \
SymX(stg_seq_frame_info) \
SymX(stg_CAF_BLACKHOLE_info) \
SymX(stg_WEAK_info) \
SymX(stg_CHARLIKE_closure) \
SymX(stg_INTLIKE_closure) \
- SymX(stg_CAF_UNENTERED_entry) \
SymX(newCAF) \
SymX(newBCOzh_fast) \
+ SymX(mkApUpd0zh_fast) \
SymX(putMVarzh_fast) \
SymX(newMVarzh_fast) \
SymX(takeMVarzh_fast) \
SymX(__int_encodeFloat) \
SymX(__int_encodeDouble) \
SymX(__gmpz_cmp_si) \
+ SymX(__gmpz_cmp_ui) \
SymX(__gmpz_cmp) \
SymX(__gmpn_gcd_1) \
SymX(prog_argv) \
SymX(PatErrorHdrHook) \
SymX(defaultsHook) \
SymX(PreTraceHook) \
- SymX(PostTraceHook)
+ SymX(PostTraceHook) \
+ SymX(stg_sig_install) \
+ Sym(nocldstop) \
+ SymX(createAdjustor) \
+ SymX(rts_mkInt) \
+ SymX(rts_mkStablePtr) \
+ SymX(rts_apply) \
+ SymX(rts_evalIO) \
+ SymX(rts_checkSchedStatus) \
+ SymX(rts_getInt)
#ifndef SUPPORT_LONG_LONGS
#define RTS_LONG_LONG_SYMS /* nothing */
oc = stgMallocBytes(sizeof(ObjectCode), "loadObj(oc)");
-# if defined(linux_TARGET_OS) || defined(solaris2_TARGET_OS)
+# if defined(OBJFORMAT_ELF)
oc->formatName = "ELF";
-# elif defined(cygwin32_TARGET_OS)
+# elif defined(OBJFORMAT_PEi386)
oc->formatName = "PEi386";
# else
free(oc);
r = stat(path, &st);
if (r == -1) { return 0; }
- oc->fileName = path;
+ /* sigh, stdup() isn't a POSIX function, so do it the long way */
+ oc->fileName = stgMallocBytes( strlen(path)+1, "loadObj" );
+ strcpy(oc->fileName, path);
+
oc->fileSize = st.st_size;
oc->image = stgMallocBytes( st.st_size, "loadObj(image)" );
oc->symbols = NULL;
}
/* verify the in-memory image */
-# if defined(linux_TARGET_OS) || defined(solaris2_TARGET_OS)
+# if defined(OBJFORMAT_ELF)
r = ocVerifyImage_ELF ( oc );
-# elif defined(cygwin32_TARGET_OS)
+# elif defined(OBJFORMAT_PEi386)
r = ocVerifyImage_PEi386 ( oc );
# else
barf("loadObj: no verify method");
if (!r) { return r; }
/* build the symbol list for this image */
-# if defined(linux_TARGET_OS) || defined(solaris2_TARGET_OS)
+# if defined(OBJFORMAT_ELF)
r = ocGetNames_ELF ( oc );
-# elif defined(cygwin32_TARGET_OS)
+# elif defined(OBJFORMAT_PEi386)
r = ocGetNames_PEi386 ( oc );
# else
barf("loadObj: no getNames method");
for (oc = objects; oc; oc = oc->next) {
if (oc->status != OBJECT_RESOLVED) {
-# if defined(linux_TARGET_OS) || defined(solaris2_TARGET_OS)
+# if defined(OBJFORMAT_ELF)
r = ocResolve_ELF ( oc );
-# elif defined(cygwin32_TARGET_OS)
+# elif defined(OBJFORMAT_PEi386)
r = ocResolve_PEi386 ( oc );
# else
barf("link: not implemented on this platform");
HsInt
unloadObj( char *path )
{
- ObjectCode *oc;
+ ObjectCode *oc, *prev;
- for (oc = objects; oc; oc = oc->next) {
+ prev = NULL;
+ for (oc = objects; oc; prev = oc, oc = oc->next) {
if (!strcmp(oc->fileName,path)) {
/* Remove all the mappings for the symbols within this
{
SymbolVal *s;
for (s = oc->symbols; s < oc->symbols + oc->n_symbols; s++) {
- removeStrHashTable(symhash, s->lbl, NULL);
+ if (s->lbl != NULL) {
+ removeStrHashTable(symhash, s->lbl, NULL);
+ }
}
}
+ if (prev == NULL) {
+ objects = oc->next;
+ } else {
+ prev->next = oc->next;
+ }
+
/* We're going to leave this in place, in case there are
any pointers from the heap into it: */
/* free(oc->image); */
+ free(oc->fileName);
free(oc->symbols);
free(oc->sections);
free(oc);
return 1;
}
}
-
+
belch("unloadObj: can't find `%s' to unload", path);
return 0;
}
/* --------------------------------------------------------------------------
- * PEi386 specifics (cygwin32)
+ * PEi386 specifics (Win32 targets)
* ------------------------------------------------------------------------*/
/* The information for this linker comes from
*/
-#if defined(cygwin32_TARGET_OS)
+#if defined(OBJFORMAT_PEi386)
return TRUE;
}
-#endif /* defined(cygwin32_TARGET_OS) */
+#endif /* defined(OBJFORMAT_PEi386) */
/* --------------------------------------------------------------------------
- * ELF specifics (Linux, Solaris)
+ * ELF specifics
* ------------------------------------------------------------------------*/
-#if defined(linux_TARGET_OS) || defined(solaris2_TARGET_OS)
+#if defined(OBJFORMAT_ELF)
#define FALSE 0
#define TRUE 1
+#if defined(sparc_TARGET_ARCH)
+# define ELF_TARGET_SPARC /* Used inside <elf.h> */
+#endif
+
#include <elf.h>
static char *
for (i = 0; i < ehdr->e_shnum; i++) {
IF_DEBUG(linker,fprintf(stderr, "%2d: ", i ));
- IF_DEBUG(linker,fprintf(stderr, "type=%2d ", shdr[i].sh_type ));
- IF_DEBUG(linker,fprintf(stderr, "size=%4d ", shdr[i].sh_size ));
- IF_DEBUG(linker,fprintf(stderr, "offs=%4d ", shdr[i].sh_offset ));
+ IF_DEBUG(linker,fprintf(stderr, "type=%2d ", (int)shdr[i].sh_type ));
+ IF_DEBUG(linker,fprintf(stderr, "size=%4d ", (int)shdr[i].sh_size ));
+ IF_DEBUG(linker,fprintf(stderr, "offs=%4d ", (int)shdr[i].sh_offset ));
IF_DEBUG(linker,fprintf(stderr, " (%p .. %p) ",
ehdrC + shdr[i].sh_offset,
ehdrC + shdr[i].sh_offset + shdr[i].sh_size - 1));
stab = (Elf32_Sym*) (ehdrC + shdr[i].sh_offset);
nent = shdr[i].sh_size / sizeof(Elf32_Sym);
oc->symbols = malloc(nent * sizeof(SymbolVal));
+ oc->n_symbols = nent;
for (j = 0; j < nent; j++) {
- if ( ( ELF32_ST_BIND(stab[j].st_info)==STB_GLOBAL /* ||
- ELF32_ST_BIND(stab[j].st_info)==STB_LOCAL */
+ if ( ( ELF32_ST_BIND(stab[j].st_info)==STB_GLOBAL
+ /* || ELF32_ST_BIND(stab[j].st_info)==STB_LOCAL */
)
/* and not an undefined symbol */
&& stab[j].st_shndx != SHN_UNDEF
insertStrHashTable(symhash, nm, &(oc->symbols[j]));
}
else {
- IF_DEBUG(linker,belch( "skipping `%s'", strtab +
- stab[j].st_name ));
+ IF_DEBUG(linker,belch( "skipping `%s'",
+ strtab + stab[j].st_name ));
+ /*
+ fprintf(stderr,
+ "skipping bind = %d, type = %d, shndx = %d `%s'\n",
+ (int)ELF32_ST_BIND(stab[j].st_info),
+ (int)ELF32_ST_TYPE(stab[j].st_info),
+ (int)stab[j].st_shndx,
+ strtab + stab[j].st_name
+ );
+ */
oc->symbols[j].lbl = NULL;
oc->symbols[j].addr = NULL;
}
}
+/* Do ELF relocations which lack an explicit addend. All x86-linux
+ relocations appear to be of this form. */
+static int do_Elf32_Rel_relocations ( ObjectCode* oc, char* ehdrC,
+ Elf32_Shdr* shdr, int shnum,
+ Elf32_Sym* stab, char* strtab )
+{
+ int j;
+ char *symbol;
+ Elf32_Word* targ;
+ Elf32_Rel* rtab = (Elf32_Rel*) (ehdrC + shdr[shnum].sh_offset);
+ int nent = shdr[shnum].sh_size / sizeof(Elf32_Rel);
+ int target_shndx = shdr[shnum].sh_info;
+ int symtab_shndx = shdr[shnum].sh_link;
+ stab = (Elf32_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
+ targ = (Elf32_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
+ IF_DEBUG(linker,belch( "relocations for section %d using symtab %d",
+ target_shndx, symtab_shndx ));
+ for (j = 0; j < nent; j++) {
+ Elf32_Addr offset = rtab[j].r_offset;
+ Elf32_Word info = rtab[j].r_info;
+
+ Elf32_Addr P = ((Elf32_Addr)targ) + offset;
+ Elf32_Word* pP = (Elf32_Word*)P;
+ Elf32_Addr A = *pP;
+ Elf32_Addr S;
+
+ IF_DEBUG(linker,belch( "Rel entry %3d is raw(%6p %6p)",
+ j, (void*)offset, (void*)info ));
+ if (!info) {
+ IF_DEBUG(linker,belch( " ZERO" ));
+ S = 0;
+ } else {
+ /* First see if it is a nameless local symbol. */
+ if (stab[ ELF32_R_SYM(info)].st_name == 0) {
+ symbol = "(noname)";
+ S = (Elf32_Addr)
+ (ehdrC + shdr[stab[ELF32_R_SYM(info)].st_shndx ].sh_offset
+ + stab[ELF32_R_SYM(info)].st_value);
+ } else {
+ /* No? Should be in the symbol table then. */
+ symbol = strtab+stab[ ELF32_R_SYM(info)].st_name;
+ (void *)S = lookupSymbol( symbol );
+ }
+ if (!S) {
+ barf("do_Elf32_Rel_relocations: %s: unknown symbol `%s'",
+ oc->fileName, symbol);
+ }
+ IF_DEBUG(linker,belch( "`%s' resolves to %p", symbol, (void*)S ));
+ }
+ IF_DEBUG(linker,belch( "Reloc: P = %p S = %p A = %p",
+ (void*)P, (void*)S, (void*)A ));
+ switch (ELF32_R_TYPE(info)) {
+#ifdef i386_TARGET_ARCH
+ case R_386_32: *pP = S + A; break;
+ case R_386_PC32: *pP = S + A - P; break;
+#endif
+ default:
+ barf("do_Elf32_Rel_relocations: unhandled ELF relocation(Rel) type %d\n", ELF32_R_TYPE(info));
+ return 0;
+ }
+
+ }
+ return 1;
+}
+
+
+/* Do ELF relocations for which explicit addends are supplied.
+ sparc-solaris relocations appear to be of this form. */
+static int do_Elf32_Rela_relocations ( ObjectCode* oc, char* ehdrC,
+ Elf32_Shdr* shdr, int shnum,
+ Elf32_Sym* stab, char* strtab )
+{
+ int j;
+ char *symbol;
+ Elf32_Word* targ;
+ Elf32_Rela* rtab = (Elf32_Rela*) (ehdrC + shdr[shnum].sh_offset);
+ int nent = shdr[shnum].sh_size / sizeof(Elf32_Rela);
+ int target_shndx = shdr[shnum].sh_info;
+ int symtab_shndx = shdr[shnum].sh_link;
+ stab = (Elf32_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
+ targ = (Elf32_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
+ IF_DEBUG(linker,belch( "relocations for section %d using symtab %d",
+ target_shndx, symtab_shndx ));
+ for (j = 0; j < nent; j++) {
+ Elf32_Addr offset = rtab[j].r_offset;
+ Elf32_Word info = rtab[j].r_info;
+ Elf32_Sword addend = rtab[j].r_addend;
+
+ Elf32_Addr P = ((Elf32_Addr)targ) + offset;
+ Elf32_Addr A = addend;
+ Elf32_Addr S;
+# if defined(sparc_TARGET_ARCH)
+ /* This #ifdef only serves to avoid unused-var warnings. */
+ Elf32_Word* pP = (Elf32_Word*)P;
+ Elf32_Word w1, w2;
+# endif
+
+ IF_DEBUG(linker,belch( "Rel entry %3d is raw(%6p %6p %6p) ",
+ j, (void*)offset, (void*)info,
+ (void*)addend ));
+ if (!info) {
+ IF_DEBUG(linker,belch( " ZERO" ));
+ S = 0;
+ } else {
+ /* First see if it is a nameless local symbol. */
+ if (stab[ ELF32_R_SYM(info)].st_name == 0) {
+ symbol = "(noname)";
+ S = (Elf32_Addr)
+ (ehdrC + shdr[stab[ELF32_R_SYM(info)].st_shndx ].sh_offset
+ + stab[ELF32_R_SYM(info)].st_value);
+ } else {
+ /* No? Should be in the symbol table then. */
+ symbol = strtab+stab[ ELF32_R_SYM(info)].st_name;
+ (void *)S = lookupSymbol( symbol );
+ }
+ if (!S) {
+ barf("ocResolve_ELF: %s: unknown symbol `%s'",
+ oc->fileName, symbol);
+ /*
+ S = 0x11223344;
+ fprintf ( stderr, "S %p A %p S+A %p S+A-P %p\n",S,A,S+A,S+A-P);
+ */
+ }
+ IF_DEBUG(linker,belch( "`%s' resolves to %p", symbol, (void*)S ));
+ }
+ IF_DEBUG(linker,fprintf ( stderr, "Reloc: P = %p S = %p A = %p\n",
+ (void*)P, (void*)S, (void*)A ));
+ switch (ELF32_R_TYPE(info)) {
+# if defined(sparc_TARGET_ARCH)
+ case R_SPARC_WDISP30:
+ w1 = *pP & 0xC0000000;
+ w2 = (Elf32_Word)((S + A - P) >> 2);
+ ASSERT((w2 & 0xC0000000) == 0);
+ w1 |= w2;
+ *pP = w1;
+ break;
+ case R_SPARC_HI22:
+ w1 = *pP & 0xFFC00000;
+ w2 = (Elf32_Word)((S + A) >> 10);
+ ASSERT((w2 & 0xFFC00000) == 0);
+ w1 |= w2;
+ *pP = w1;
+ break;
+ case R_SPARC_LO10:
+ w1 = *pP & ~0x3FF;
+ w2 = (Elf32_Word)((S + A) & 0x3FF);
+ ASSERT((w2 & ~0x3FF) == 0);
+ w1 |= w2;
+ *pP = w1;
+ break;
+ case R_SPARC_32:
+ w2 = (Elf32_Word)(S + A);
+ *pP = w2;
+ break;
+ case R_SPARC_NONE: belch("R_SPARC_NONE");
+ break;
+
+# endif
+ default:
+ fprintf(stderr, "unhandled ELF relocation(RelA) type %d\n",
+ ELF32_R_TYPE(info));
+ barf("do_Elf32_Rela_relocations: unhandled ELF relocation type");
+ return 0;
+ }
+
+ }
+ return 1;
+}
+
+
static int
ocResolve_ELF ( ObjectCode* oc )
{
- char *strtab, *symbol;
- int i, j;
+ char *strtab;
+ int shnum, ok;
Elf32_Sym* stab = NULL;
char* ehdrC = (char*)(oc->image);
Elf32_Ehdr* ehdr = (Elf32_Ehdr*) ehdrC;
Elf32_Shdr* shdr = (Elf32_Shdr*) (ehdrC + ehdr->e_shoff);
- Elf32_Word* targ;
/* first find "the" symbol table */
stab = (Elf32_Sym*) findElfSection ( ehdrC, SHT_SYMTAB );
return 0;
}
- for (i = 0; i < ehdr->e_shnum; i++) {
- if (shdr[i].sh_type == SHT_REL ) {
- Elf32_Rel* rtab = (Elf32_Rel*) (ehdrC + shdr[i].sh_offset);
- int nent = shdr[i].sh_size / sizeof(Elf32_Rel);
- int target_shndx = shdr[i].sh_info;
- int symtab_shndx = shdr[i].sh_link;
- stab = (Elf32_Sym*) (ehdrC + shdr[ symtab_shndx ].sh_offset);
- targ = (Elf32_Word*)(ehdrC + shdr[ target_shndx ].sh_offset);
- IF_DEBUG(linker,belch( "relocations for section %d using symtab %d",
- target_shndx, symtab_shndx ));
- for (j = 0; j < nent; j++) {
- Elf32_Addr offset = rtab[j].r_offset;
- Elf32_Word info = rtab[j].r_info;
-
- Elf32_Addr P = ((Elf32_Addr)targ) + offset;
- Elf32_Word* pP = (Elf32_Word*)P;
- Elf32_Addr A = *pP;
- Elf32_Addr S;
-
- IF_DEBUG(linker,belch( "Rel entry %3d is raw(%6p %6p) ",
- j, (void*)offset, (void*)info ));
- if (!info) {
- IF_DEBUG(linker,belch( " ZERO" ));
- S = 0;
- } else {
- /* First see if it is a nameless local symbol. */
- if (stab[ ELF32_R_SYM(info)].st_name == 0) {
- symbol = "(noname)";
- S = (Elf32_Addr)(ehdrC
- + shdr[stab[ELF32_R_SYM(info)].st_shndx ].sh_offset
- + stab[ELF32_R_SYM(info)].st_value
- );
- } else {
- /* No? Should be in the symbol table then. */
- symbol = strtab+stab[ ELF32_R_SYM(info)].st_name;
- (void *)S = lookupSymbol( symbol );
- }
- if (!S) {
- barf("ocResolve_ELF: %s: unknown symbol `%s'",
- oc->fileName, symbol);
- }
- IF_DEBUG(linker,belch( "`%s' resolves to %p", symbol, (void*)S ));
- }
- IF_DEBUG(linker,fprintf ( stderr, "Reloc: P = %p S = %p A = %p\n", (void*)P, (void*)S, (void*)A ));
- switch (ELF32_R_TYPE(info)) {
- case R_386_32: *pP = S + A; break;
- case R_386_PC32: *pP = S + A - P; break;
- default: fprintf(stderr,
- "unhandled ELF relocation type %d",
- ELF32_R_TYPE(info));
- belch("ocResolve_ELF: unhandled ELF relocation type");
- return 0;
- }
-
- }
+ /* Process the relocation sections. */
+ for (shnum = 0; shnum < ehdr->e_shnum; shnum++) {
+ if (shdr[shnum].sh_type == SHT_REL ) {
+ ok = do_Elf32_Rel_relocations ( oc, ehdrC, shdr,
+ shnum, stab, strtab );
+ if (!ok) return ok;
}
else
- if (shdr[i].sh_type == SHT_RELA) {
- belch("ocResolve_ELF: RelA style reloc table -- not yet done");
- return 0;
+ if (shdr[shnum].sh_type == SHT_RELA) {
+ ok = do_Elf32_Rela_relocations ( oc, ehdrC, shdr,
+ shnum, stab, strtab );
+ if (!ok) return ok;
}
}
}
-#endif /* defined(linux_TARGET_OS) || defined(solaris2_TARGET_OS) */
+#endif /* ELF */
/* -----------------------------------------------------------------------------
* Look up an address to discover whether it is in text or data space.
}
int
-is_dynamically_loaded_code_or_rodata_ptr ( char* p )
+is_dynamically_loaded_code_or_rodata_ptr ( void* p )
{
SectionKind sk = lookupSection(p);
ASSERT (sk != SECTIONKIND_NOINFOAVAIL);
int
-is_dynamically_loaded_rwdata_ptr ( char* p )
+is_dynamically_loaded_rwdata_ptr ( void* p )
{
SectionKind sk = lookupSection(p);
ASSERT (sk != SECTIONKIND_NOINFOAVAIL);
int
-is_not_dynamically_loaded_ptr ( char* p )
+is_not_dynamically_loaded_ptr ( void* p )
{
SectionKind sk = lookupSection(p);
ASSERT (sk != SECTIONKIND_NOINFOAVAIL);
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