From: wolfgang Date: Mon, 10 Feb 2003 23:35:03 +0000 (+0000) Subject: [project @ 2003-02-10 23:35:03 by wolfgang] X-Git-Tag: Approx_11550_changesets_converted~1184 X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=commitdiff_plain;h=8115ed091349a17e65f409a70b55514b8d09318d [project @ 2003-02-10 23:35:03 by wolfgang] Mac OS X: add one more relocation type (PPC_RELOC_BR24) and add more C run-time library symbols to the symbol table (made more difficult by the fact that these symbols don't have an underscore prefix, while everything else on Mac OS X has) --- diff --git a/ghc/rts/Linker.c b/ghc/rts/Linker.c index e1d1480..7253fdf 100644 --- a/ghc/rts/Linker.c +++ b/ghc/rts/Linker.c @@ -1,5 +1,5 @@ /* ----------------------------------------------------------------------------- - * $Id: Linker.c,v 1.113 2003/02/10 10:41:52 simonmar Exp $ + * $Id: Linker.c,v 1.114 2003/02/10 23:35:03 wolfgang Exp $ * * (c) The GHC Team, 2000, 2001 * @@ -91,6 +91,8 @@ static int ocResolve_PEi386 ( ObjectCode* oc ); static int ocVerifyImage_MachO ( ObjectCode* oc ); static int ocGetNames_MachO ( ObjectCode* oc ); static int ocResolve_MachO ( ObjectCode* oc ); + +static void machoInitSymbolsWithoutUnderscore(); #endif /* ----------------------------------------------------------------------------- @@ -550,6 +552,13 @@ typedef struct _RtsSymbolVal { Sym(__ashrdi3) \ Sym(__lshrdi3) \ Sym(__eprintf) + + // Symbols that don't have a leading underscore + // on Mac OS X. They have to receive special treatment, + // see machoInitSymbolsWithoutUnderscore() +#define RTS_MACHO_NOUNDERLINE_SYMBOLS \ + Sym(saveFP) \ + Sym(restFP) #else #define RTS_EXTRA_SYMBOLS /* nothing */ #endif @@ -658,6 +667,10 @@ initLinker( void ) ghciInsertStrHashTable("(GHCi built-in symbols)", symhash, sym->lbl, sym->addr); } +# if defined(OBJFORMAT_MACHO) + machoInitSymbolsWithoutUnderscore(); +# endif + # if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO) dl_prog_handle = dlopen(NULL, RTLD_LAZY); # endif @@ -2939,7 +2952,7 @@ static int ocVerifyImage_MachO(ObjectCode* oc) return 1; } -static void resolveImports( +static int resolveImports( ObjectCode* oc, char *image, struct symtab_command *symLC, @@ -2965,15 +2978,17 @@ static void resolveImports( addr = lookupSymbol(nm); if(!addr) { - fprintf(stderr, "not found: %s\n", nm); - abort(); + belch("\n%s: unknown symbol `%s'", oc->fileName, nm); + return 0; } ASSERT(addr); ((void**)(image + sect->offset))[i] = addr; } + + return 1; } -static void relocateSection(char *image, +static int relocateSection(char *image, struct symtab_command *symLC, struct nlist *nlist, struct section* sections, struct section *sect) { @@ -2981,9 +2996,9 @@ static void relocateSection(char *image, int i,n; if(!strcmp(sect->sectname,"__la_symbol_ptr")) - return; + return 1; else if(!strcmp(sect->sectname,"__nl_symbol_ptr")) - return; + return 1; n = sect->nreloc; relocs = (struct relocation_info*) (image + sect->reloff); @@ -3013,9 +3028,9 @@ static void relocateSection(char *image, if(reloc->r_pcrel && !reloc->r_extern) continue; - if(!reloc->r_pcrel && reloc->r_length == 2) + if(reloc->r_length == 2) { - unsigned long word; + unsigned long word = 0; unsigned long* wordPtr = (unsigned long*) (image + sect->offset + reloc->r_address); @@ -3038,6 +3053,12 @@ static void relocateSection(char *image, word = ((unsigned short*) wordPtr)[1] << 16; word += ((short)relocs[i+1].r_address & (short)0xFFFF); } + else if(reloc->r_type == PPC_RELOC_BR24) + { + word = *wordPtr; + word = (word & 0x03FFFFFC) | (word & 0x02000000) ? 0xFC000000 : 0; + } + if(!reloc->r_extern) { @@ -3053,7 +3074,14 @@ static void relocateSection(char *image, struct nlist *symbol = &nlist[reloc->r_symbolnum]; char *nm = image + symLC->stroff + symbol->n_un.n_strx; word = (unsigned long) (lookupSymbol(nm)); - ASSERT(word); + if(!word) + { + belch("\nunknown symbol `%s'", nm); + return 0; + } + + if(reloc->r_pcrel) + word -= ((long)image) + sect->offset + reloc->r_address; } if(reloc->r_type == GENERIC_RELOC_VANILLA) @@ -3077,13 +3105,17 @@ static void relocateSection(char *image, + ((word & (1<<15)) ? 1 : 0); i++; continue; } - continue; + else if(reloc->r_type == PPC_RELOC_BR24) + { + *wordPtr = (*wordPtr & 0xFC000003) | (word & 0x03FFFFFC); + continue; + } } - fprintf(stderr, "unknown reloc\n"); - abort(); - ASSERT(2 + 2 == 5); + barf("\nunknown relocation %d",reloc->r_type); + return 0; } } + return 1; } static int ocGetNames_MachO(ObjectCode* oc) @@ -3243,13 +3275,16 @@ static int ocResolve_MachO(ObjectCode* oc) indirectSyms = (unsigned long*) (image + dsymLC->indirectsymoff); if(la_ptrs) - resolveImports(oc,image,symLC,la_ptrs,indirectSyms,nlist); + if(!resolveImports(oc,image,symLC,la_ptrs,indirectSyms,nlist)) + return 0; if(nl_ptrs) - resolveImports(oc,image,symLC,nl_ptrs,indirectSyms,nlist); + if(!resolveImports(oc,image,symLC,nl_ptrs,indirectSyms,nlist)) + return 0; for(i=0;insects;i++) { - relocateSection(image,symLC,nlist,sections,§ions[i]); + if(!relocateSection(image,symLC,nlist,sections,§ions[i])) + return 0; } /* Free the local symbol table; we won't need it again. */ @@ -3258,4 +3293,25 @@ static int ocResolve_MachO(ObjectCode* oc) return 1; } +/* + * The Mach-O object format uses leading underscores. But not everywhere. + * There is a small number of runtime support functions defined in + * libcc_dynamic.a whose name does not have a leading underscore. + * As a consequence, we can't get their address from C code. + * We have to use inline assembler just to take the address of a function. + * Yuck. + */ + +static void machoInitSymbolsWithoutUnderscore() +{ + void *p; + +#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 + +} #endif