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Commit cd22d3c7 authored by wolfgang's avatar wolfgang
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[project @ 2005-06-13 00:16:44 by wolfgang] 

Darwin/x86: support GHCi.
parent 59177a1b
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ghc/rts/Linker.c
View file @ cd22d3c7
......@@ -78,12 +78,14 @@
# include <windows.h>
# include <math.h>
#elif defined(darwin_HOST_OS)
# include <mach-o/ppc/reloc.h>
# define OBJFORMAT_MACHO
# include <mach-o/loader.h>
# include <mach-o/nlist.h>
# include <mach-o/reloc.h>
# include <mach-o/dyld.h>
#if defined(powerpc_HOST_ARCH)
# include <mach-o/ppc/reloc.h>
#endif
#endif
/* Hash table mapping symbol names to Symbol */
......@@ -104,13 +106,15 @@ static int ocVerifyImage_PEi386 ( ObjectCode* oc );
static int ocGetNames_PEi386 ( ObjectCode* oc );
static int ocResolve_PEi386 ( ObjectCode* oc );
#elif defined(OBJFORMAT_MACHO)
static int ocAllocateJumpIslands_MachO ( ObjectCode* oc );
static int ocVerifyImage_MachO ( ObjectCode* oc );
static int ocGetNames_MachO ( ObjectCode* oc );
static int ocResolve_MachO ( ObjectCode* oc );
#ifdef powerpc_HOST_ARCH
static int ocAllocateJumpIslands_MachO ( ObjectCode* oc );
static void machoInitSymbolsWithoutUnderscore( void );
#endif
#endif
/* -----------------------------------------------------------------------------
* Built-in symbols from the RTS
......@@ -634,7 +638,7 @@ typedef struct _RtsSymbolVal {
#define RTS_LIBGCC_SYMBOLS
#endif
#ifdef darwin_HOST_OS
#if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
// Symbols that don't have a leading underscore
// on Mac OS X. They have to receive special treatment,
// see machoInitSymbolsWithoutUnderscore()
......@@ -682,6 +686,12 @@ static RtsSymbolVal rtsSyms[] = {
RTS_MINGW_ONLY_SYMBOLS
RTS_CYGWIN_ONLY_SYMBOLS
RTS_LIBGCC_SYMBOLS
#if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
// dyld stub code contains references to this,
// but it should never be called because we treat
// lazy pointers as nonlazy.
{ "dyld_stub_binding_helper", 0xDEADBEEF },
#endif
{ 0, 0 } /* sentinel */
};
......@@ -754,7 +764,7 @@ initLinker( void )
ghciInsertStrHashTable("(GHCi built-in symbols)",
symhash, sym->lbl, sym->addr);
}
# if defined(OBJFORMAT_MACHO)
# if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
machoInitSymbolsWithoutUnderscore();
# endif
......@@ -1020,7 +1030,6 @@ loadObj( char *path )
#else
FILE *f;
#endif
initLinker();
/* debugBelch("loadObj %s\n", path ); */
......@@ -1139,7 +1148,7 @@ loadObj( char *path )
#endif /* USE_MMAP */
# if defined(OBJFORMAT_MACHO)
# if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
r = ocAllocateJumpIslands_MachO ( oc );
if (!r) { return r; }
# elif defined(OBJFORMAT_ELF) && defined(powerpc_HOST_ARCH)
......@@ -3361,7 +3370,7 @@ static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
#if defined(OBJFORMAT_MACHO)
/*
Support for MachO linking on Darwin/MacOS X on PowerPC chips
Support for MachO linking on Darwin/MacOS X
by Wolfgang Thaller (wolfgang.thaller@gmx.net)
I hereby formally apologize for the hackish nature of this code.
......@@ -3370,6 +3379,7 @@ static int ocAllocateJumpIslands_ELF( ObjectCode *oc )
*) add still more sanity checks.
*/
#ifdef powerpc_HOST_ARCH
static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
{
struct mach_header *header = (struct mach_header *) oc->image;
......@@ -3414,6 +3424,7 @@ static int ocAllocateJumpIslands_MachO(ObjectCode* oc)
}
return ocAllocateJumpIslands(oc,0,0);
}
#endif
static int ocVerifyImage_MachO(ObjectCode* oc STG_UNUSED)
{
......@@ -3492,6 +3503,10 @@ static int relocateSection(
return 1;
else if(!strcmp(sect->sectname,"__nl_symbol_ptr"))
return 1;
else if(!strcmp(sect->sectname,"__la_sym_ptr2"))
return 1;
else if(!strcmp(sect->sectname,"__la_sym_ptr3"))
return 1;
n = sect->nreloc;
relocs = (struct relocation_info*) (image + sect->reloff);
......@@ -3511,6 +3526,15 @@ static int relocateSection(
unsigned long* wordPtr = (unsigned long*) (image + sect->offset + scat->r_address);
checkProddableBlock(oc,wordPtr);
// Note on relocation types:
// i386 uses the GENERIC_RELOC_* types,
// while ppc uses special PPC_RELOC_* types.
// *_RELOC_VANILLA and *_RELOC_PAIR have the same value
// in both cases, all others are different.
// Therefore, we use GENERIC_RELOC_VANILLA
// and GENERIC_RELOC_PAIR instead of the PPC variants,
// and use #ifdefs for the other types.
// Step 1: Figure out what the relocated value should be
if(scat->r_type == GENERIC_RELOC_VANILLA)
{
......@@ -3521,23 +3545,28 @@ static int relocateSection(
scat->r_value)
- scat->r_value;
}
#ifdef powerpc_HOST_ARCH
else if(scat->r_type == PPC_RELOC_SECTDIFF
|| scat->r_type == PPC_RELOC_LO16_SECTDIFF
|| scat->r_type == PPC_RELOC_HI16_SECTDIFF
|| scat->r_type == PPC_RELOC_HA16_SECTDIFF)
#else
else if(scat->r_type == GENERIC_RELOC_SECTDIFF)
#endif
{
struct scattered_relocation_info *pair =
(struct scattered_relocation_info*) &relocs[i+1];
if(!pair->r_scattered || pair->r_type != PPC_RELOC_PAIR)
if(!pair->r_scattered || pair->r_type != GENERIC_RELOC_PAIR)
barf("Invalid Mach-O file: "
"PPC_RELOC_*_SECTDIFF not followed by PPC_RELOC_PAIR");
"RELOC_*_SECTDIFF not followed by RELOC_PAIR");
word = (unsigned long)
(relocateAddress(oc, nSections, sections, scat->r_value)
- relocateAddress(oc, nSections, sections, pair->r_value));
i++;
}
#ifdef powerpc_HOST_ARCH
else if(scat->r_type == PPC_RELOC_HI16
|| scat->r_type == PPC_RELOC_LO16
|| scat->r_type == PPC_RELOC_HA16
......@@ -3576,14 +3605,21 @@ static int relocateSection(
i++;
}
#endif
else
continue; // ignore the others
#ifdef powerpc_HOST_ARCH
if(scat->r_type == GENERIC_RELOC_VANILLA
|| scat->r_type == PPC_RELOC_SECTDIFF)
#else
if(scat->r_type == GENERIC_RELOC_VANILLA
|| scat->r_type == GENERIC_RELOC_SECTDIFF)
#endif
{
*wordPtr = word;
}
#ifdef powerpc_HOST_ARCH
else if(scat->r_type == PPC_RELOC_LO16_SECTDIFF || scat->r_type == PPC_RELOC_LO16)
{
((unsigned short*) wordPtr)[1] = word & 0xFFFF;
......@@ -3597,6 +3633,7 @@ static int relocateSection(
((unsigned short*) wordPtr)[1] = ((word >> 16) & 0xFFFF)
+ ((word & (1<<15)) ? 1 : 0);
}
#endif
}
}
......@@ -3611,10 +3648,12 @@ static int relocateSection(
if(reloc->r_length == 2)
{
unsigned long word = 0;
#ifdef powerpc_HOST_ARCH
unsigned long jumpIsland = 0;
long offsetToJumpIsland = 0xBADBAD42; // initialise to bad value
// to avoid warning and to catch
// bugs.
#endif
unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address);
checkProddableBlock(oc,wordPtr);
......@@ -3623,6 +3662,7 @@ static int relocateSection(
{
word = *wordPtr;
}
#ifdef powerpc_HOST_ARCH
else if(reloc->r_type == PPC_RELOC_LO16)
{
word = ((unsigned short*) wordPtr)[1];
......@@ -3643,7 +3683,7 @@ static int relocateSection(
word = *wordPtr;
word = (word & 0x03FFFFFC) | ((word & 0x02000000) ? 0xFC000000 : 0);
}
#endif
if(!reloc->r_extern)
{
......@@ -3667,17 +3707,19 @@ static int relocateSection(
if(reloc->r_pcrel)
{
#ifdef powerpc_HOST_ARCH
// In the .o file, this should be a relative jump to NULL
// and we'll change it to a jump to a relative jump to the symbol
// and we'll change it to a relative jump to the symbol
ASSERT(-word == reloc->r_address);
word = (unsigned long) symbolAddress;
jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,word);
word -= ((long)image) + sect->offset + reloc->r_address;
jumpIsland = makeJumpIsland(oc,reloc->r_symbolnum,(unsigned long) symbolAddress);
if(jumpIsland != 0)
{
offsetToJumpIsland = jumpIsland
- (((long)image) + sect->offset + reloc->r_address);
offsetToJumpIsland = word + jumpIsland
- (((long)image) + sect->offset - sect->addr);
}
#endif
word += (unsigned long) symbolAddress
- (((long)image) + sect->offset - sect->addr);
}
else
{
......@@ -3690,6 +3732,7 @@ static int relocateSection(
*wordPtr = word;
continue;
}
#ifdef powerpc_HOST_ARCH
else if(reloc->r_type == PPC_RELOC_LO16)
{
((unsigned short*) wordPtr)[1] = word & 0xFFFF;
......@@ -3726,7 +3769,8 @@ static int relocateSection(
*wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC);
continue;
}
}
#endif
}
barf("\nunknown relocation %d",reloc->r_type);
return 0;
}
......@@ -3908,6 +3952,10 @@ static int ocResolve_MachO(ObjectCode* oc)
la_ptrs = &sections[i];
else if(!strcmp(sections[i].sectname,"__nl_symbol_ptr"))
nl_ptrs = &sections[i];
else if(!strcmp(sections[i].sectname,"__la_sym_ptr2"))
la_ptrs = &sections[i];
else if(!strcmp(sections[i].sectname,"__la_sym_ptr3"))
la_ptrs = &sections[i];
}
if(dsymLC)
......@@ -3940,6 +3988,7 @@ static int ocResolve_MachO(ObjectCode* oc)
return 1;
}
#ifdef powerpc_HOST_ARCH
/*
* The Mach-O object format uses leading underscores. But not everywhere.
* There is a small number of runtime support functions defined in
......@@ -3972,3 +4021,4 @@ static void machoInitSymbolsWithoutUnderscore()
#undef Sym
}
#endif
#endif
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