From b829bff15b4760c20c7b0eae49c70c35aa2b46d6 Mon Sep 17 00:00:00 2001 From: John Hodge Date: Sat, 31 May 2014 13:35:53 +0800 Subject: [PATCH] Usermode/ld-acess - Large cleanup to ELF dynamic linking - Support for weak symbols, and corrected resolution logic - General code cleanup --- KernelLand/Kernel/bin/elf.c | 4 +- Usermode/Libraries/ld-acess.so_src/Makefile | 5 +- .../ld-acess.so_src/arch/syscalls.s.h | 1 + Usermode/Libraries/ld-acess.so_src/common.h | 2 +- Usermode/Libraries/ld-acess.so_src/elf.c | 462 +++++++++++------- Usermode/Libraries/ld-acess.so_src/elf32.h | 21 +- Usermode/Libraries/ld-acess.so_src/export.c | 1 + Usermode/Libraries/ld-acess.so_src/loadlib.c | 71 ++- Usermode/Libraries/ld-acess.so_src/main.c | 8 +- 9 files changed, 368 insertions(+), 207 deletions(-) diff --git a/KernelLand/Kernel/bin/elf.c b/KernelLand/Kernel/bin/elf.c index 7f65d89d..7998d86c 100644 --- a/KernelLand/Kernel/bin/elf.c +++ b/KernelLand/Kernel/bin/elf.c @@ -15,8 +15,8 @@ #if BITS <= 32 # define DISABLE_ELF64 #endif -static int GetSymbol(const char *Name, void **Value, size_t *Size); -static int GetSymbol(const char *Name, void **Value, size_t *Size) { +static int GetSymbol(const char *Name, void **Value, size_t *Size, void *IgnoreBase); +static int GetSymbol(const char *Name, void **Value, size_t *Size, void *IgnoreBase) { Uint val; if(!Binary_GetSymbol(Name, &val)) { Log_Notice("ELF", "Lookup of '%s' failed", Name); diff --git a/Usermode/Libraries/ld-acess.so_src/Makefile b/Usermode/Libraries/ld-acess.so_src/Makefile index 4dc881c0..a588f759 100644 --- a/Usermode/Libraries/ld-acess.so_src/Makefile +++ b/Usermode/Libraries/ld-acess.so_src/Makefile @@ -11,10 +11,11 @@ EXTRABIN := libld-acess.so EXTRACLEAN = $(_OBJPREFIX)_stublib.o INCFILES := sys/sys.h -CFLAGS = -g -Wall -fno-builtin -fno-stack-protector -fPIC -std=c99 +CFLAGS = -g -Wall -fno-builtin -fno-stack-protector -fPIC -std=c99 -ffreestanding # -fno-leading-underscore CFLAGS += $(CPPFLAGS) -LDFLAGS = -g -T arch/$(ARCHDIR).ld -Map map.txt --export-dynamic +LDFLAGS = -ffreestanding -nostdlib -g -Wl,-T,arch/$(ARCHDIR).ld -Map map.txt --export-dynamic -x +LIBS := $(LIBGCC_PATH) ifeq ($(ARCH),native) XBIN := $(addprefix $(OUTPUTDIR)Libs/,$(EXTRABIN)) diff --git a/Usermode/Libraries/ld-acess.so_src/arch/syscalls.s.h b/Usermode/Libraries/ld-acess.so_src/arch/syscalls.s.h index 7f0acb83..14ee2da3 100644 --- a/Usermode/Libraries/ld-acess.so_src/arch/syscalls.s.h +++ b/Usermode/Libraries/ld-acess.so_src/arch/syscalls.s.h @@ -37,6 +37,7 @@ SYSCALL1(_SysSetFaultHandler, SYS_SETFAULTHANDLER) SYSCALL1(_SysLoadModule, SYS_LOADMOD) +SYSCALL6(_ZN4_sys5debugEPKcz, 0x100) SYSCALL6(_SysDebug, 0x100) SYSCALL1(_SysGetPhys, SYS_GETPHYS) // uint64_t _SysGetPhys(uint addr) SYSCALL1(_SysAllocate, SYS_ALLOCATE) // uint64_t _SysAllocate(uint addr) diff --git a/Usermode/Libraries/ld-acess.so_src/common.h b/Usermode/Libraries/ld-acess.so_src/common.h index ac07f9c7..e0620c26 100644 --- a/Usermode/Libraries/ld-acess.so_src/common.h +++ b/Usermode/Libraries/ld-acess.so_src/common.h @@ -41,7 +41,7 @@ extern void *DoRelocate(void *Base, char **envp, const char *Filename); // === Library/Symbol Manipulation == extern void *LoadLibrary(const char *Filename, const char *SearchDir, char **envp); extern void AddLoaded(const char *File, void *base); -extern int GetSymbol(const char *Name, void **Value, size_t *size); +extern int GetSymbol(const char *Name, void **Value, size_t *size, void *IgnoreBase); extern int GetSymbolFromBase(void *base, const char *name, void **ret, size_t *size); // === Library Functions === diff --git a/Usermode/Libraries/ld-acess.so_src/elf.c b/Usermode/Libraries/ld-acess.so_src/elf.c index 71e9a92b..236983c3 100644 --- a/Usermode/Libraries/ld-acess.so_src/elf.c +++ b/Usermode/Libraries/ld-acess.so_src/elf.c @@ -22,34 +22,51 @@ #include "elf64.h" #if DEBUG -# define DEBUGS(v...) SysDebug("ld-acess - " v) +# define DEBUG_OUT(...) SysDebug(__VA_ARGS__) #else -# define DEBUGS(...) +# define DEBUG_OUT(...) do{}while(0) //((void)(__VA_ARGS__)) #endif +#define WARNING(f,...) SysDebug("WARN: "f ,## __VA_ARGS__) // Malformed file +#define NOTICE(f,...) SysDebug("NOTICE: "f ,## __VA_ARGS__) // Missing relocation +#define TRACE(f,...) DEBUG_OUT("TRACE:%s:%i "f, __func__, __LINE__ ,## __VA_ARGS__) // Debugging trace + #ifndef DISABLE_ELF64 # define SUPPORT_ELF64 #endif +typedef struct +{ + void *Base; + intptr_t iBaseDiff; + const char *strtab; + Elf32_Sym *symtab; +} tElfRelocInfo; + +typedef int tElf32RelocFcn(tElfRelocInfo *Info, uint32_t t_info, uint32_t *ptr, Elf32_Addr addend, int bRela); + // === CONSTANTS === #if DEBUG //static const char *csaDT_NAMES[] = {"DT_NULL", "DT_NEEDED", "DT_PLTRELSZ", "DT_PLTGOT", "DT_HASH", "DT_STRTAB", "DT_SYMTAB", "DT_RELA", "DT_RELASZ", "DT_RELAENT", "DT_STRSZ", "DT_SYMENT", "DT_INIT", "DT_FINI", "DT_SONAME", "DT_RPATH", "DT_SYMBOLIC", "DT_REL", "DT_RELSZ", "DT_RELENT", "DT_PLTREL", "DT_DEBUG", "DT_TEXTREL", "DT_JMPREL"}; -static const char *csaR_NAMES[] = {"R_386_NONE", "R_386_32", "R_386_PC32", "R_386_GOT32", "R_386_PLT32", "R_386_COPY", "R_386_GLOB_DAT", "R_386_JMP_SLOT", "R_386_RELATIVE", "R_386_GOTOFF", "R_386_GOTPC", "R_386_LAST"}; +//static const char *csaR_NAMES[] = {"R_386_NONE", "R_386_32", "R_386_PC32", "R_386_GOT32", "R_386_PLT32", "R_386_COPY", "R_386_GLOB_DAT", "R_386_JMP_SLOT", "R_386_RELATIVE", "R_386_GOTOFF", "R_386_GOTPC", "R_386_LAST"}; #endif // === PROTOTYPES === void *ElfRelocate(void *Base, char **envp, const char *Filename); int ElfGetSymbol(void *Base, const char *Name, void **Ret, size_t *Size); void *Elf32Relocate(void *Base, char **envp, const char *Filename); + int Elf32GetSymbolVars(void *Base, Elf32_Sym** symtab, Elf32_Word** pBuckets, const char **dynstrtab, uintptr_t* piBaseDiff); + int Elf32GetSymbolInfo(void *Base, const char *Name, void **Addr, size_t *Size, int* Section, int *Binding, int *Type); int Elf32GetSymbol(void *Base, const char *Name, void **Ret, size_t *Size); - int elf_doRelocate_386(uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int type, int bRela, const char *Sym, intptr_t iBaseDiff); - int elf_doRelocate_arm(uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int type, int bRela, const char *Sym, intptr_t iBaseDiff); - int elf_doRelocate_unk(uint32_t , uint32_t *, Elf32_Addr , int , int , const char *, intptr_t); +tElf32RelocFcn elf_doRelocate_386; +tElf32RelocFcn elf_doRelocate_arm; +tElf32RelocFcn elf_doRelocate_unk; #ifdef SUPPORT_ELF64 int _Elf64DoReloc_X86_64(void *Base, const char *strtab, Elf64_Sym *symtab, Elf64_Xword r_info, void *ptr, Elf64_Sxword addend); void *Elf64Relocate(void *Base, char **envp, const char *Filename); int Elf64GetSymbol(void *Base, const char *Name, void **Ret, size_t *Size); #endif + int Elf32GetSymbolReloc(tElfRelocInfo *Info, const Elf32_Sym *Symbol, void **Ret, size_t *Size); uint32_t ElfHashString(const char *name); // === CODE === @@ -96,122 +113,117 @@ int ElfGetSymbol(void *Base, const char *Name, void **ret, size_t *Size) } } -int elf_doRelocate_386(uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int type, - int bRela, const char *Sym, intptr_t iBaseDiff) +int elf_doRelocate_386(tElfRelocInfo *Info, uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int bRela) { - void *symval; - switch( type ) + const Elf32_Sym *sym = &Info->symtab[ ELF32_R_SYM(r_info) ]; + void *symval = (void*)sym->st_value; + size_t size = sym->st_size; + TRACE("%i '%s'", ELF32_R_TYPE(r_info), Info->strtab + sym->st_name); + switch( ELF32_R_TYPE(r_info) ) { // Standard 32 Bit Relocation (S+A) case R_386_32: - if( !GetSymbol(Sym, &symval, NULL) ) - return 1; - DEBUGS(" elf_doRelocate: R_386_32 *0x%x += %p('%s')", - ptr, symval, Sym); + TRACE("R_386_32 *0x%x = %p + 0x%x", ptr, symval, addend); *ptr = (intptr_t)symval + addend; break; // 32 Bit Relocation wrt. Offset (S+A-P) case R_386_PC32: - DEBUGS(" elf_doRelocate: '%s'", Sym); - if( !GetSymbol(Sym, &symval, NULL) ) return 1; - DEBUGS(" elf_doRelocate: R_386_PC32 *0x%x = 0x%x + 0x%p - 0x%x", - ptr, *ptr, symval, (intptr_t)ptr ); + TRACE("R_386_PC32 *0x%x = 0x%x + 0x%p - 0x%x", ptr, *ptr, symval, (intptr_t)ptr ); *ptr = (intptr_t)symval + addend - (intptr_t)ptr; //*ptr = val + addend - ((Uint)ptr - iBaseDiff); break; // Absolute Value of a symbol (S) case R_386_GLOB_DAT: + TRACE("R_386_GLOB_DAT *0x%x = %p", ptr, symval); if(0) case R_386_JMP_SLOT: - DEBUGS(" elf_doRelocate: '%s'", Sym); - if( !GetSymbol(Sym, &symval, NULL) ) return 1; - DEBUGS(" elf_doRelocate: %s *0x%x = %p", csaR_NAMES[type], ptr, symval); + TRACE("R_386_JMP_SLOT *0x%x = %p", ptr, symval); *ptr = (intptr_t)symval; break; // Base Address (B+A) case R_386_RELATIVE: - DEBUGS(" elf_doRelocate: R_386_RELATIVE *0x%x = 0x%x + 0x%x", ptr, iBaseDiff, addend); - *ptr = iBaseDiff + addend; + TRACE("R_386_RELATIVE *0x%x = 0x%x + 0x%x", ptr, Info->iBaseDiff, addend); + *ptr = Info->iBaseDiff + addend; break; case R_386_COPY: { - size_t size; - if( !GetSymbol(Sym, &symval, &size) ) return 1; - DEBUGS(" elf_doRelocate_386: R_386_COPY (%p, %p, %i)", ptr, symval, size); + void *old_symval = symval; + GetSymbol(Info->strtab + sym->st_name, &symval, &size, Info->Base); + if( symval == old_symval ) { + WARNING("Can't find required external symbol '%s'", Info->strtab + sym->st_name); + return 1; + } + TRACE("R_386_COPY (%p, %p, %i)", ptr, symval, size); memcpy(ptr, symval, size); break; } default: - SysDebug("elf_doRelocate_386: Unknown relocation %i", type); + WARNING("Unknown relocation %i", ELF32_ST_TYPE(r_info)); return 2; } return 0; } -int elf_doRelocate_arm(uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int type, int bRela, const char *Sym, intptr_t iBaseDiff) +int elf_doRelocate_arm(tElfRelocInfo *Info, uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int bRela) { - uint32_t val; - switch(type) + const Elf32_Sym *sym = &Info->symtab[ ELF32_R_SYM(r_info) ]; + void *symval = (void*)sym->st_value; + size_t size = sym->st_size; + TRACE("%i '%s'", ELF32_R_TYPE(r_info), Info->strtab + sym->st_name); + uintptr_t val = (uintptr_t)symval; + switch( ELF32_R_TYPE(r_info) ) { // (S + A) | T case R_ARM_ABS32: - DEBUGS(" elf_doRelocate_arm: R_ARM_ABS32 %p (%s + %x)", ptr, Sym, addend); - if( !GetSymbol(Sym, (void**)&val, NULL) ) return 1; + TRACE("R_ARM_ABS32 %p (%p + %x)", ptr, symval, addend); *ptr = val + addend; break; case R_ARM_GLOB_DAT: - DEBUGS(" elf_doRelocate_arm: R_ARM_GLOB_DAT %p (%s + %x)", ptr, Sym, addend); - if( !GetSymbol(Sym, (void**)&val, NULL) ) return 1; + TRACE("R_ARM_GLOB_DAT %p (%p + %x)", ptr, symval, addend); *ptr = val + addend; break; case R_ARM_JUMP_SLOT: if(!bRela) addend = 0; - DEBUGS(" elf_doRelocate_arm: R_ARM_JUMP_SLOT %p (%s + %x)", ptr, Sym, addend); - if( !GetSymbol(Sym, (void**)&val, NULL) ) return 1; + TRACE("R_ARM_JUMP_SLOT %p (%p + %x)", ptr, symval, addend); *ptr = val + addend; break; // Copy - case R_ARM_COPY: { - size_t size; - void *src; - if( !GetSymbol(Sym, &src, &size) ) return 1; - DEBUGS(" elf_doRelocate_arm: R_ARM_COPY (%p, %p, %i)", ptr, src, size); - memcpy(ptr, src, size); - break; } + case R_ARM_COPY: + TRACE("R_ARM_COPY (%p, %p, %i)", ptr, symval, size); + memcpy(ptr, symval, size); + break; // Delta between link and runtime locations + A case R_ARM_RELATIVE: - DEBUGS(" elf_doRelocate_arm: R_ARM_RELATIVE %p (0x%x + 0x%x)", ptr, iBaseDiff, addend); - if(Sym[0] != '\0') { + TRACE("R_ARM_RELATIVE %p (0x%x + 0x%x)", ptr, Info->iBaseDiff, addend); + if(ELF32_R_SYM(r_info) != 0) { // TODO: Get delta for a symbol - SysDebug("elf_doRelocate_arm: TODO - Implment R_ARM_RELATIVE for symbols"); + WARNING("TODO - Implment R_ARM_RELATIVE for symbols"); return 2; } else { - *ptr = iBaseDiff + addend; + *ptr = Info->iBaseDiff + addend; } break; default: - SysDebug("elf_doRelocate_arm: Unknown Relocation, %i", type); + WARNING("Unknown Relocation, %i", ELF32_R_TYPE(r_info)); return 2; } return 0; } -int elf_doRelocate_unk(uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int type, int bRela, const char *Sym, intptr_t iBaseDiff) +int elf_doRelocate_unk(tElfRelocInfo *Info, uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int bRela) { return 1; } void *Elf32Relocate(void *Base, char **envp, const char *Filename) { - Elf32_Ehdr *hdr = Base; - Elf32_Phdr *phtab; + const Elf32_Ehdr *hdr = Base; char *libPath; intptr_t iRealBase = -1; intptr_t iBaseDiff; - int iSegmentCount; Elf32_Rel *rel = NULL; Elf32_Rela *rela = NULL; void *plt = NULL; @@ -219,18 +231,16 @@ void *Elf32Relocate(void *Base, char **envp, const char *Filename) int relaSz=0, relaEntSz=8; int pltSz=0, pltType=0; Elf32_Dyn *dynamicTab = NULL; // Dynamic Table Pointer - char *dynstrtab = NULL; // .dynamic String Table - Elf32_Sym *dynsymtab; - int (*do_relocate)(uint32_t t_info, uint32_t *ptr, Elf32_Addr addend, int Type, int bRela, const char *Sym, intptr_t iBaseDiff); - DEBUGS("ElfRelocate: (Base=0x%x)", Base); + TRACE("(Base=0x%x)", Base); // Check magic header // Parse Program Header to get Dynamic Table - phtab = (void*)( (uintptr_t)Base + hdr->phoff ); - iSegmentCount = hdr->phentcount; + // - Determine the linked base of the executable + const Elf32_Phdr *phtab = (void*)( (uintptr_t)Base + hdr->phoff ); + const int iSegmentCount = hdr->phentcount; for(int i = 0; i < iSegmentCount; i ++) { switch(phtab[i].Type) @@ -246,7 +256,7 @@ void *Elf32Relocate(void *Base, char **envp, const char *Filename) dynamicTab = (void *) (intptr_t) phtab[i].VAddr; } else { - DEBUGS(" WARNING - elf_relocate: Multiple PT_DYNAMIC segments"); + WARNING("elf_relocate: Multiple PT_DYNAMIC segments"); } break; } @@ -254,13 +264,11 @@ void *Elf32Relocate(void *Base, char **envp, const char *Filename) // Page Align real base iRealBase &= ~0xFFF; - DEBUGS(" elf_relocate: True Base = 0x%x, Compiled Base = 0x%x", Base, iRealBase); + TRACE("True Base = 0x%x, Compiled Base = 0x%x", Base, iRealBase); // Adjust "Real" Base iBaseDiff = (intptr_t)Base - iRealBase; -// hdr->entrypoint += iBaseDiff; // Adjust Entrypoint - // Check if a PT_DYNAMIC segement was found if(!dynamicTab) { SysDebug(" elf_relocate: No PT_DYNAMIC segment in image %p, returning", Base); @@ -283,29 +291,30 @@ void *Elf32Relocate(void *Base, char **envp, const char *Filename) dynamicTab = (void *)( (intptr_t)dynamicTab + iBaseDiff ); // === Get Symbol table and String Table === - dynsymtab = NULL; + char *dynstrtab = NULL; // .dynamic String Table + Elf32_Sym *dynsymtab = NULL; + Elf32_Word *hashtable = NULL; + int iSymCount = 0; for( int j = 0; dynamicTab[j].d_tag != DT_NULL; j++) { - switch(dynamicTab[j].d_tag) + const Elf32_Dyn *dt = &dynamicTab[j]; + switch(dt->d_tag) { // --- Symbol Table --- case DT_SYMTAB: - DEBUGS(" elf_relocate: DYNAMIC Symbol Table 0x%x (0x%x)", - dynamicTab[j].d_val, dynamicTab[j].d_val + iBaseDiff); - dynsymtab = (void*)((intptr_t)dynamicTab[j].d_val + iBaseDiff); - //if(iBaseDiff != 0) dynamicTab[j].d_val += iBaseDiff; + TRACE("DYNAMIC Symbol Table 0x%x (0x%x)", dt->d_val, dt->d_val + iBaseDiff); + dynsymtab = (void*)((intptr_t)dt->d_val + iBaseDiff); break; // --- String Table --- case DT_STRTAB: - DEBUGS(" elf_relocate: DYNAMIC String Table 0x%x (0x%x)", - dynamicTab[j].d_val, dynamicTab[j].d_val + iBaseDiff); - dynstrtab = (void*)((intptr_t)dynamicTab[j].d_val + iBaseDiff); - //if(iBaseDiff != 0) dynamicTab[j].d_val += iBaseDiff; + TRACE("DYNAMIC String Table 0x%x (0x%x)", dt->d_val, dt->d_val + iBaseDiff); + dynstrtab = (void*)((intptr_t)dt->d_val + iBaseDiff); break; // --- Hash Table -- case DT_HASH: - //if(iBaseDiff != 0) dynamicTab[j].d_val += iBaseDiff; -// iSymCount = ((Elf32_Word*)(intptr_t)dynamicTab[j].d_val)[1]; + TRACE("DYNAMIC Hash table %p (%p)", dt->d_val, dt->d_val + iBaseDiff); + hashtable = (void*)((intptr_t)dt->d_val + iBaseDiff); + iSymCount = hashtable[1]; break; } } @@ -314,48 +323,75 @@ void *Elf32Relocate(void *Base, char **envp, const char *Filename) SysDebug("ld-acess.so - WARNING: No Dynamic Symbol table in %p, returning", hdr); return (void *)(intptr_t) (hdr->entrypoint + iBaseDiff); } + + // Apply base offset to locally defined symbols + // - #0 is defined as ("" SHN_UNDEF), so skip it + for( int i = 1; i < iSymCount; i ++ ) + { + Elf32_Sym *sym = &dynsymtab[i]; + const char *name = dynstrtab + sym->st_name; + (void)name; + if( sym->st_shndx == SHN_UNDEF ) + { + TRACE("Sym %i'%s' deferred (SHN_UNDEF)", i, name); + } + else if( sym->st_shndx == SHN_ABS ) + { + // Leave as is + SysDebug("Sym %i'%s' untouched", i, name); + } + else + { + // TODO: What about weak locally-defined symbols? + if( ELF32_ST_BIND(sym->st_info) == STB_WEAK ) + { + WARNING("TODO: Weak bound local symbols '%s'", name); + assert(ELF32_ST_BIND(sym->st_info) != STB_WEAK); + return NULL; + } + TRACE("Sym %i'%s' %p += 0x%x", i, name, sym->st_value, iBaseDiff); + sym->st_value += iBaseDiff; + } + } // === Add to loaded list (can be imported now) === AddLoaded( Filename, Base ); // === Parse Relocation Data === - DEBUGS(" elf_relocate: dynamicTab = 0x%x", dynamicTab); + TRACE("dynamicTab = 0x%x", dynamicTab); for( int j = 0; dynamicTab[j].d_tag != DT_NULL; j++) { - switch(dynamicTab[j].d_tag) + const Elf32_Dyn *dt = &dynamicTab[j]; + switch(dt->d_tag) { // --- Shared Library Name --- case DT_SONAME: - DEBUGS(" elf_relocate: .so Name '%s'", dynstrtab+dynamicTab[j].d_val); + TRACE(".so Name '%s'", dynstrtab + dt->d_val); break; // --- Needed Library --- case DT_NEEDED: - libPath = dynstrtab + dynamicTab[j].d_val; - DEBUGS(" dynstrtab = %p, d_val = 0x%x", dynstrtab, dynamicTab[j].d_val); - DEBUGS(" Required Library '%s'", libPath); + //assert(dt->d_val <= sizeof_dynstrtab); + libPath = dynstrtab + dt->d_val; + TRACE(" Required Library '%s'", libPath); if(LoadLibrary(libPath, NULL, envp) == 0) { - #if DEBUG - DEBUGS(" elf_relocate: Unable to load '%s'", libPath); - #else SysDebug("Unable to load required library '%s'", libPath); - #endif return 0; } - DEBUGS(" Lib loaded"); + TRACE(" Lib loaded"); break; // --- PLT/GOT --- -// case DT_PLTGOT: pltgot = (void*)(iBaseDiff + dynamicTab[j].d_val); break; - case DT_JMPREL: plt = (void*)(iBaseDiff + dynamicTab[j].d_val); break; - case DT_PLTREL: pltType = dynamicTab[j].d_val; break; - case DT_PLTRELSZ: pltSz = dynamicTab[j].d_val; break; +// case DT_PLTGOT: pltgot = (void*)(iBaseDiff + dt->d_val); break; + case DT_JMPREL: plt = (void*)(iBaseDiff + dt->d_val); break; + case DT_PLTREL: pltType = dt->d_val; break; + case DT_PLTRELSZ: pltSz = dt->d_val; break; // --- Relocation --- - case DT_REL: rel = (void*)(iBaseDiff + dynamicTab[j].d_val); break; - case DT_RELSZ: relSz = dynamicTab[j].d_val; break; - case DT_RELENT: relEntSz = dynamicTab[j].d_val; break; - case DT_RELA: rela = (void*)(iBaseDiff + dynamicTab[j].d_val); break; - case DT_RELASZ: relaSz = dynamicTab[j].d_val; break; - case DT_RELAENT: relaEntSz = dynamicTab[j].d_val; break; + case DT_REL: rel = (void*)(iBaseDiff + dt->d_val); break; + case DT_RELSZ: relSz = dt->d_val; break; + case DT_RELENT: relEntSz = dt->d_val; break; + case DT_RELA: rela = (void*)(iBaseDiff + dt->d_val); break; + case DT_RELASZ: relaSz = dt->d_val; break; + case DT_RELAENT: relaEntSz = dt->d_val; break; // --- Symbol Table --- case DT_SYMTAB: @@ -367,17 +403,60 @@ void *Elf32Relocate(void *Base, char **envp, const char *Filename) // --- Unknown --- default: - if(dynamicTab[j].d_tag > DT_JMPREL) continue; + if(dt->d_tag > DT_JMPREL) continue; //DEBUGS(" elf_relocate: %i-%i = %s,0x%x", // i,j, csaDT_NAMES[dynamicTab[j].d_tag],dynamicTab[j].d_val); break; } } - DEBUGS(" elf_relocate: Beginning Relocation"); - + // Resolve symbols (second pass) + // - #0 is defined as ("" SHN_UNDEF), so skip it int fail = 0; + for( int i = 1; i < iSymCount; i ++ ) + { + Elf32_Sym *sym = &dynsymtab[i]; + const char *name = dynstrtab + sym->st_name; + if( sym->st_shndx == SHN_UNDEF ) + { + void *newval; + size_t newsize; + if( !GetSymbol(name, &newval, &newsize, Base) ) { + if( ELF32_ST_BIND(sym->st_info) != STB_WEAK ) { + // Not a weak binding, set fail and move on + WARNING("Elf32Relocate: Can't find required symbol '%s' for '%s'", + name, Filename); + fail = 1; + continue ; + } + // Leave the symbol value as-is + } + else { + TRACE("Sym %i'%s' bound to %p+0x%x", i, name, newval, newsize); + sym->st_value = (intptr_t)newval; + sym->st_size = newsize; + } + } + else if( sym->st_shndx == SHN_ABS ) + { + // Leave as is + } + else + { + // Handled previously + // TODO: What about weak locally-defined symbols? + assert( ELF32_ST_BIND(sym->st_info) != STB_WEAK ); + } + } + if( fail ) { + WARNING("Relocation of '%s' failed", Filename); + return NULL; + } + + TRACE("Beginning Relocation on '%s'", Filename); + + tElf32RelocFcn *do_relocate; switch(hdr->machine) { case EM_386: @@ -393,21 +472,26 @@ void *Elf32Relocate(void *Base, char **envp, const char *Filename) break; } - DEBUGS("do_relocate = %p (%p or %p)", do_relocate, &elf_doRelocate_386, &elf_doRelocate_arm); + TRACE("do_relocate = %p (%p or %p)", do_relocate, &elf_doRelocate_386, &elf_doRelocate_arm); #define _doRelocate(r_info, ptr, bRela, addend) \ - do_relocate(r_info, ptr, addend, ELF32_R_TYPE(r_info), bRela, \ - dynstrtab + dynsymtab[ELF32_R_SYM(r_info)].nameOfs, iBaseDiff); + do_relocate(&reloc_info, r_info, ptr, addend, bRela); + + tElfRelocInfo reloc_info = { + .Base = Base, + .iBaseDiff = iBaseDiff, + .strtab = dynstrtab, + .symtab = dynsymtab + }; // Parse Relocation Entries if(rel && relSz) { Elf32_Word *ptr; - DEBUGS(" elf_relocate: rel=0x%x, relSz=0x%x, relEntSz=0x%x", rel, relSz, relEntSz); + TRACE("rel=0x%x, relSz=0x%x, relEntSz=0x%x", rel, relSz, relEntSz); int max = relSz / relEntSz; for( int i = 0; i < max; i++ ) { - //DEBUGS(" Rel %i: 0x%x+0x%x", i, iBaseDiff, rel[i].r_offset); ptr = (void*)(iBaseDiff + rel[i].r_offset); fail |= _doRelocate(rel[i].r_info, ptr, 0, *ptr); } @@ -416,7 +500,7 @@ void *Elf32Relocate(void *Base, char **envp, const char *Filename) if(rela && relaSz) { Elf32_Word *ptr; - DEBUGS(" elf_relocate: rela=0x%x, relaSz=0x%x, relaEntSz=0x%x", rela, relaSz, relaEntSz); + TRACE("rela=0x%x, relaSz=0x%x, relaEntSz=0x%x", rela, relaSz, relaEntSz); int count = relaSz / relaEntSz; for( int i = 0; i < count; i++ ) { @@ -429,12 +513,12 @@ void *Elf32Relocate(void *Base, char **envp, const char *Filename) if(plt && pltSz) { Elf32_Word *ptr; - DEBUGS(" elf_relocate: Relocate PLT, plt=0x%x", plt); + TRACE("Relocate PLT, plt=0x%x", plt); if(pltType == DT_REL) { Elf32_Rel *pltRel = plt; int count = pltSz / sizeof(Elf32_Rel); - DEBUGS(" elf_relocate: PLT Reloc Type = Rel, %i entries", count); + TRACE("PLT Reloc Type = Rel, %i entries", count); for(int i = 0; i < count; i ++) { ptr = (void*)(iBaseDiff + pltRel[i].r_offset); @@ -445,7 +529,7 @@ void *Elf32Relocate(void *Base, char **envp, const char *Filename) { Elf32_Rela *pltRela = plt; int count = pltSz / sizeof(Elf32_Rela); - DEBUGS(" elf_relocate: PLT Reloc Type = Rela, %i entries", count); + TRACE("PLT Reloc Type = Rela, %i entries", count); for(int i=0;ientrypoint + iBaseDiff, __builtin_return_address(0)); + TRACE("RETURN 0x%x to %p", hdr->entrypoint + iBaseDiff, __builtin_return_address(0)); return (void*)(intptr_t)( hdr->entrypoint + iBaseDiff ); } -int Elf32GetSymbol(void *Base, const char *Name, void **ret, size_t *Size) +int Elf32GetSymbolVars(void *Base, Elf32_Sym** symtab, Elf32_Word** pBuckets, const char **dynstrtab, uintptr_t* piBaseDiff) { - Elf32_Ehdr *hdr = Base; - Elf32_Sym *symtab = NULL; - int nbuckets = 0; - Elf32_Word *pBuckets = NULL; - Elf32_Word *pChains; - uint32_t iNameHash; - const char *dynstrtab = NULL; - uintptr_t iBaseDiff = -1; - Elf32_Phdr *phtab; Elf32_Dyn *dynTab = NULL; - - // Locate the tables - phtab = (void*)( (uintptr_t)Base + hdr->phoff ); + uintptr_t iBaseDiff = -1; + Elf32_Ehdr *hdr = Base; + Elf32_Phdr *phtab = (void*)( (uintptr_t)Base + hdr->phoff ); for( int i = 0; i < hdr->phentcount; i ++ ) { if(phtab[i].Type == PT_LOAD && iBaseDiff > phtab[i].VAddr) @@ -502,7 +577,7 @@ int Elf32GetSymbol(void *Base, const char *Name, void **ret, size_t *Size) } if( !dynTab ) { SysDebug("ERROR - Unable to find DYNAMIC segment in %p", Base); - return 0; + return 1; } iBaseDiff = (intptr_t)Base - iBaseDiff; // Make iBaseDiff actually the diff dynTab = (void*)( (intptr_t)dynTab + iBaseDiff ); @@ -512,63 +587,99 @@ int Elf32GetSymbol(void *Base, const char *Name, void **ret, size_t *Size) { // --- Symbol Table --- case DT_SYMTAB: - symtab = (void*)((intptr_t)dynTab[i].d_val + iBaseDiff); // Rebased in Relocate + *symtab = (void*)((intptr_t)dynTab[i].d_val + iBaseDiff); // Rebased in Relocate break; case DT_STRTAB: - dynstrtab = (void*)((intptr_t)dynTab[i].d_val + iBaseDiff); + *dynstrtab = (void*)((intptr_t)dynTab[i].d_val + iBaseDiff); break; // --- Hash Table -- case DT_HASH: - pBuckets = (void*)((intptr_t)dynTab[i].d_val + iBaseDiff); + *pBuckets = (void*)((intptr_t)dynTab[i].d_val + iBaseDiff); break; } } - if( !symtab ) { + if( !*symtab ) { SysDebug("ERRO - No DT_SYMTAB in %p", Base); - return 0; + return 1; } - if( !pBuckets ) { + if( !*pBuckets ) { SysDebug("ERRO - No DT_HASH in %p", Base); - return 0; + return 1; } - if( !dynstrtab ) { + if( !*dynstrtab ) { SysDebug("ERRO - No DT_STRTAB in %p", Base); - return 0; + return 1; } // ... ok... maybe they haven't been relocated - if( (uintptr_t)symtab < (uintptr_t)Base ) + if( (uintptr_t)*symtab < (uintptr_t)Base ) { - symtab = (void*)( (uintptr_t)symtab + iBaseDiff ); - pBuckets = (void*)( (uintptr_t)pBuckets + iBaseDiff ); - dynstrtab = (void*)( (uintptr_t)dynstrtab + iBaseDiff ); - SysDebug("Executable not yet relocated"); + SysDebug("Executable not yet relocated (symtab,pBuckets,dynstrtab = %p,%p,%p + 0x%x)", + *symtab,*pBuckets,*dynstrtab, iBaseDiff); + *symtab = (void*)( (uintptr_t)*symtab + iBaseDiff ); + *pBuckets = (void*)( (uintptr_t)*pBuckets + iBaseDiff ); + *dynstrtab = (void*)( (uintptr_t)*dynstrtab + iBaseDiff ); } + *piBaseDiff = iBaseDiff; + return 0; +} - nbuckets = pBuckets[0]; -// iSymCount = pBuckets[1]; +int Elf32GetSymbolInfo(void *Base, const char *Name, void **Addr, size_t *Size, int* Section, int *Binding, int *Type) +{ + // Locate the tables + uintptr_t iBaseDiff = -1; + Elf32_Sym *symtab = NULL; + Elf32_Word *pBuckets = NULL; + const char *dynstrtab = NULL; + if( Elf32GetSymbolVars(Base, &symtab, &pBuckets, &dynstrtab, &iBaseDiff) ) + return 1; + + int nbuckets = pBuckets[0]; +// int iSymCount = pBuckets[1]; pBuckets = &pBuckets[2]; - pChains = &pBuckets[ nbuckets ]; + Elf32_Word* pChains = &pBuckets[ nbuckets ]; assert(pChains); // Get hash - iNameHash = ElfHashString(Name); + int iNameHash = ElfHashString(Name); iNameHash %= nbuckets; // Walk Chain int idx = pBuckets[ iNameHash ]; do { - Elf32_Sym *sym = &symtab[idx]; + const Elf32_Sym *sym = &symtab[idx]; assert(sym); - if(sym->shndx != SHN_UNDEF && strcmp(dynstrtab + sym->nameOfs, Name) == 0) { - *ret = (void*)( (uintptr_t)sym->value + iBaseDiff ); - if(Size) *Size = sym->size; - return 1; + if( strcmp(dynstrtab + sym->st_name, Name) == 0 ) + { + TRACE("*sym = {value:0x%x,size:0x%x,info:0x%x,other:0x%x,shndx:%i}", + sym->st_value, sym->st_size, sym->st_info, + sym->st_other, sym->st_shndx); + if(Addr) *Addr = (void*)( sym->st_value ); + if(Size) *Size = sym->st_size; + if(Binding) *Binding = ELF32_ST_BIND(sym->st_info); + if(Type) *Type = ELF32_ST_TYPE(sym->st_info); + if(Section) *Section = sym->st_shndx; + return 0; } } while( (idx = pChains[idx]) != STN_UNDEF && idx != pBuckets[iNameHash] ); - return 0; + TRACE("No symbol"); + return 1; +} + +int Elf32GetSymbol(void *Base, const char *Name, void **ret, size_t *Size) +{ + int section; + TRACE("Elf32GetSymbol(%p,%s,...)", Base, Name); + if( Elf32GetSymbolInfo(Base, Name, ret, Size, §ion, NULL, NULL) ) + return 0; + if( section == SHN_UNDEF ) { + TRACE("Elf32GetSymbol: Undefined", *ret, (Size?*Size:0), section); + return 0; + } + TRACE("Elf32GetSymbol: Found %p+0x%x,section=%i", *ret, (Size?*Size:0), section); + return 1; } #ifdef SUPPORT_ELF64 @@ -586,20 +697,20 @@ int _Elf64DoReloc_X86_64(void *Base, const char *strtab, Elf64_Sym *symtab, Elf6 case R_X86_64_NONE: break; case R_X86_64_64: - if( !GetSymbol(symname, &symval, NULL) ) return 1; + if( !GetSymbol(symname, &symval, NULL, NULL) ) return 1; *(uint64_t*)ptr = (uintptr_t)symval + addend; break; case R_X86_64_COPY: { size_t size; - if( !GetSymbol(symname, &symval, &size) ) return 1; + if( !GetSymbol(symname, &symval, &size, NULL) ) return 1; memcpy(ptr, symval, size); } break; case R_X86_64_GLOB_DAT: - if( !GetSymbol(symname, &symval, NULL) ) return 1; + if( !GetSymbol(symname, &symval, NULL, NULL) ) return 1; *(uint64_t*)ptr = (uintptr_t)symval; break; case R_X86_64_JUMP_SLOT: - if( !GetSymbol(symname, &symval, NULL) ) return 1; + if( !GetSymbol(symname, &symval, NULL, NULL) ) return 1; *(uint64_t*)ptr = (uintptr_t)symval; break; case R_X86_64_RELATIVE: @@ -630,18 +741,18 @@ void *Elf64Relocate(void *Base, char **envp, const char *Filename) void *pltrel = NULL; int plt_size = 0, plt_type = 0; - DEBUGS("Elf64Relocate: hdr = {"); - DEBUGS("Elf64Relocate: e_ident = '%.16s'", hdr->e_ident); - DEBUGS("Elf64Relocate: e_type = 0x%x", hdr->e_type); - DEBUGS("Elf64Relocate: e_machine = 0x%x", hdr->e_machine); - DEBUGS("Elf64Relocate: e_version = 0x%x", hdr->e_version); - DEBUGS("Elf64Relocate: e_entry = %p", hdr->e_entry); - DEBUGS("Elf64Relocate: e_phoff = 0x%llx", hdr->e_phoff); - DEBUGS("Elf64Relocate: e_shoff = 0x%llx", hdr->e_shoff); - DEBUGS("Elf64Relocate: e_flags = 0x%x", hdr->e_flags); - DEBUGS("Elf64Relocate: e_ehsize = 0x%x", hdr->e_ehsize); - DEBUGS("Elf64Relocate: e_phentsize = 0x%x", hdr->e_phentsize); - DEBUGS("Elf64Relocate: e_phnum = %i", hdr->e_phnum); + TRACE("hdr = {"); + TRACE(" e_ident = '%.16s'", hdr->e_ident); + TRACE(" e_type = 0x%x", hdr->e_type); + TRACE(" e_machine = 0x%x", hdr->e_machine); + TRACE(" e_version = 0x%x", hdr->e_version); + TRACE(" e_entry = %p", hdr->e_entry); + TRACE(" e_phoff = 0x%llx", hdr->e_phoff); + TRACE(" e_shoff = 0x%llx", hdr->e_shoff); + TRACE(" e_flags = 0x%x", hdr->e_flags); + TRACE(" e_ehsize = 0x%x", hdr->e_ehsize); + TRACE(" e_phentsize = 0x%x", hdr->e_phentsize); + TRACE(" e_phnum = %i", hdr->e_phnum); // Scan for the dynamic table (and find the compiled base) phtab = (void*)((uintptr_t)Base + (uintptr_t)hdr->e_phoff); @@ -655,7 +766,7 @@ void *Elf64Relocate(void *Base, char **envp, const char *Filename) baseDiff = (uintptr_t)Base - compiledBase; - DEBUGS("baseDiff = %p", baseDiff); + TRACE("baseDiff = %p", baseDiff); if(dyntab == NULL) { SysDebug(" Elf64Relocate: No PT_DYNAMIC segment in image %p, returning", Base); @@ -696,14 +807,14 @@ void *Elf64Relocate(void *Base, char **envp, const char *Filename) // Second pass on dynamic table for(i = 0; dyntab[i].d_tag != DT_NULL; i ++) { - DEBUGS("dyntab[%i].d_tag = %i", i, dyntab[i].d_tag); + TRACE("dyntab[%i].d_tag = %i", i, dyntab[i].d_tag); switch(dyntab[i].d_tag) { case DT_SONAME: break; case DT_NEEDED: { char *libPath = strtab + dyntab[i].d_un.d_val; - DEBUGS("Elf64Relocate: libPath = '%s'", libPath); + TRACE("Elf64Relocate: libPath = '%s'", libPath); if(LoadLibrary(libPath, NULL, envp) == 0) { SysDebug("ld-acess - Elf64Relocate: Unable to load '%s'", libPath); return NULL; @@ -752,6 +863,8 @@ void *Elf64Relocate(void *Base, char **envp, const char *Filename) } } + // TODO: Relocate symbols + // Relocation function t_elf64_doreloc fpElf64DoReloc = &_Elf64DoReloc_X86_64; #define _Elf64DoReloc(info, ptr, addend) fpElf64DoReloc(Base, strtab, symtab, info, ptr, addend) @@ -759,7 +872,7 @@ void *Elf64Relocate(void *Base, char **envp, const char *Filename) int fail = 0; if( rel ) { - DEBUGS("rel_count = %i", rel_count); + TRACE("rel_count = %i", rel_count); for( i = 0; i < rel_count; i ++ ) { uint64_t *ptr = (void *)(uintptr_t)( rel[i].r_offset + baseDiff ); @@ -769,7 +882,7 @@ void *Elf64Relocate(void *Base, char **envp, const char *Filename) if( rela ) { - DEBUGS("rela_count = %i", rela_count); + TRACE("rela_count = %i", rela_count); for( i = 0; i < rela_count; i ++ ) { uint64_t *ptr = (void *)(uintptr_t)( rela[i].r_offset + baseDiff ); @@ -782,7 +895,7 @@ void *Elf64Relocate(void *Base, char **envp, const char *Filename) if( plt_type == DT_REL ) { Elf64_Rel *plt = pltrel; int count = plt_size / sizeof(Elf64_Rel); - DEBUGS("plt rel count = %i", count); + TRACE("plt rel count = %i", count); for( i = 0; i < count; i ++ ) { uint64_t *ptr = (void *)(uintptr_t)( plt[i].r_offset + baseDiff ); @@ -792,7 +905,7 @@ void *Elf64Relocate(void *Base, char **envp, const char *Filename) else { Elf64_Rela *plt = pltrel; int count = plt_size / sizeof(Elf64_Rela); - DEBUGS("plt rela count = %i", count); + TRACE("plt rela count = %i", count); for( i = 0; i < count; i ++ ) { uint64_t *ptr = (void *)(uintptr_t)( plt[i].r_offset + baseDiff ); @@ -802,13 +915,13 @@ void *Elf64Relocate(void *Base, char **envp, const char *Filename) } if( fail ) { - DEBUGS("Elf64Relocate: Failure"); + TRACE("Failure"); return NULL; } { void *ret = (void *)(uintptr_t)(hdr->e_entry + baseDiff); - DEBUGS("Elf64Relocate: Relocations done, return %p", ret); + TRACE("Relocations done, return %p", ret); return ret; } } @@ -887,7 +1000,7 @@ int Elf64GetSymbol(void *Base, const char *Name, void **Ret, size_t *Size) if(symtab[i].st_shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[i].st_name, Name) == 0) { *Ret = (void*)( (intptr_t)symtab[i].st_value + iBaseDiff ); if(Size) *Size = symtab[i].st_size; - DEBUGS("%s = %p", Name, *Ret); + TRACE("%s = %p", Name, *Ret); return 1; } @@ -897,7 +1010,7 @@ int Elf64GetSymbol(void *Base, const char *Name, void **Ret, size_t *Size) if(symtab[i].st_shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[i].st_name, Name) == 0) { *Ret = (void*)((intptr_t)symtab[i].st_value + iBaseDiff); if(Size) *Size = symtab[i].st_size; - DEBUGS("%s = %p", Name, *Ret); + TRACE("%s = %p", Name, *Ret); return 1; } } @@ -906,7 +1019,6 @@ int Elf64GetSymbol(void *Base, const char *Name, void **Ret, size_t *Size) } #endif - uint32_t ElfHashString(const char *name) { uint32_t h = 0, g; diff --git a/Usermode/Libraries/ld-acess.so_src/elf32.h b/Usermode/Libraries/ld-acess.so_src/elf32.h index 2e9c1c4a..bb15f822 100644 --- a/Usermode/Libraries/ld-acess.so_src/elf32.h +++ b/Usermode/Libraries/ld-acess.so_src/elf32.h @@ -112,15 +112,24 @@ struct sElf32_Shent { #endif struct elf_sym_s { - Elf32_Word nameOfs; - Elf32_Addr value; //Address - Elf32_Word size; - uint8_t info; - uint8_t other; - Elf32_Half shndx; + Elf32_Word st_name; + Elf32_Addr st_value; //Address + Elf32_Word st_size; + uint8_t st_info; + uint8_t st_other; + Elf32_Half st_shndx; }; #define STN_UNDEF 0 // Undefined Symbol +#define ELF32_ST_BIND(i) ((i)>>4) +#define ELF32_ST_TYPE(i) ((i)&0xF) + +enum { + STB_LOCAL, + STB_GLOBAL, + STB_WEAK, +}; + enum { PT_NULL, //0 PT_LOAD, //1 diff --git a/Usermode/Libraries/ld-acess.so_src/export.c b/Usermode/Libraries/ld-acess.so_src/export.c index 10c5c5cd..e40dd8eb 100644 --- a/Usermode/Libraries/ld-acess.so_src/export.c +++ b/Usermode/Libraries/ld-acess.so_src/export.c @@ -11,6 +11,7 @@ extern int32_t __modsi3(int32_t Num, int32_t Den); extern uint32_t __udivsi3(uint32_t Num, uint32_t Den); extern uint32_t __umodsi3(uint32_t Num, uint32_t Den); extern void ldacess_DumpLoadedLibraries(void); +extern void _ZN4_sys5debugEPKcz(const char *,...); // C++ "_sys::debug" used by STL debug #define _STR(x) #x #define STR(x) _STR(x) diff --git a/Usermode/Libraries/ld-acess.so_src/loadlib.c b/Usermode/Libraries/ld-acess.so_src/loadlib.c index 88aafc31..dbb7c156 100644 --- a/Usermode/Libraries/ld-acess.so_src/loadlib.c +++ b/Usermode/Libraries/ld-acess.so_src/loadlib.c @@ -14,8 +14,7 @@ # define DEBUGS(v...) #endif -// === PROTOTYPES === -void *IsFileLoaded(const char *file); +#define MAX_QUEUED_ENTRYPOINTS 8 // === IMPORTS === extern const struct { @@ -26,10 +25,21 @@ extern const int ciNumLocalExports; extern char **gEnvP; extern char gLinkedBase[]; +// === TYPES === +typedef void tLibEntry(void *, int, char *[], char**); + +// === PROTOTYPES === +void *IsFileLoaded(const char *file); + // === GLOABLS === tLoadedLib gLoadedLibraries[MAX_LOADED_LIBRARIES]; char gsLoadedStrings[MAX_STRINGS_BYTES]; char *gsNextAvailString = gsLoadedStrings; +struct sQueuedEntry { + void *Base; + tLibEntry *Entry; +} gaQueuedEntrypoints[MAX_QUEUED_ENTRYPOINTS]; + int giNumQueuedEntrypoints; //tLoadLib *gpLoadedLibraries = NULL; // === CODE === @@ -45,6 +55,20 @@ void ldacess_DumpLoadedLibraries(void) } } +/** + * \brief Call queued up entry points (after relocations completed) + */ +void CallQueuedEntrypoints(char **EnvP) +{ + while( giNumQueuedEntrypoints ) + { + giNumQueuedEntrypoints --; + const struct sQueuedEntry *qe = &gaQueuedEntrypoints[giNumQueuedEntrypoints]; + //_SysDebug("Calling EP for %p", qe->Base); + qe->Entry(qe->Base, 0, NULL, EnvP); + } +} + const char *FindLibrary(char *DestBuf, const char *SoName, const char *ExtraSearchDir) { // -- #1: Executable Specified @@ -72,14 +96,12 @@ const char *FindLibrary(char *DestBuf, const char *SoName, const char *ExtraSear void *LoadLibrary(const char *SoName, const char *SearchDir, char **envp) { char sTmpName[1024]; - const char *filename; void *base; - void (*fEntry)(void *, int, char *[], char**); DEBUGS("LoadLibrary: (SoName='%s', SearchDir='%s', envp=%p)", SoName, SearchDir, envp); // Create Temp Name - filename = FindLibrary(sTmpName, SoName, SearchDir); + const char *filename = FindLibrary(sTmpName, SoName, SearchDir); if(filename == NULL) { DEBUGS("LoadLibrary: RETURN 0"); return 0; @@ -91,6 +113,7 @@ void *LoadLibrary(const char *SoName, const char *SearchDir, char **envp) DEBUGS(" LoadLibrary: SysLoadBin()"); // Load Library + tLibEntry *fEntry; base = _SysLoadBin(filename, (void**)&fEntry); if(!base) { DEBUGS("LoadLibrary: RETURN 0"); @@ -106,10 +129,17 @@ void *LoadLibrary(const char *SoName, const char *SearchDir, char **envp) } // Call Entrypoint - DEBUGS(" LoadLibrary: '%s' Entry %p", SoName, fEntry); - fEntry(base, 0, NULL, gEnvP); + // - TODO: Queue entrypoint calls + if( giNumQueuedEntrypoints >= MAX_QUEUED_ENTRYPOINTS ) { + SysDebug("ERROR - Maximum number of queued entrypoints exceeded on %p '%s'", + base, SoName); + return 0; + } + gaQueuedEntrypoints[giNumQueuedEntrypoints].Base = base; + gaQueuedEntrypoints[giNumQueuedEntrypoints].Entry = fEntry; + giNumQueuedEntrypoints ++; - DEBUGS("LoadLibrary: RETURN 1"); + DEBUGS("LoadLibrary: RETURN success"); return base; } @@ -223,33 +253,36 @@ void Unload(void *Base) \fn Uint GetSymbol(const char *name) \brief Gets a symbol value from a loaded library */ -int GetSymbol(const char *name, void **Value, size_t *Size) +int GetSymbol(const char *name, void **Value, size_t *Size, void *IgnoreBase) { - int i; - - //SysDebug("ciNumLocalExports = %i", ciNumLocalExports); - for(i=0;i #include #include "common.h" +#undef SoMain // === PROTOTYPES === void *DoRelocate(void *base, char **envp, const char *Filename); @@ -14,6 +15,7 @@ void *DoRelocate(void *base, char **envp, const char *Filename); extern char gLinkedBase[]; char **gEnvP; extern int memcmp(const void *m1, const void *m2, size_t size); +extern void CallQueuedEntrypoints(char **EnvP); // === CODE === /** @@ -41,7 +43,6 @@ void *SoMain(void *base, int argc, char **argv, char **envp) } // Otherwise do relocations - //ret = DoRelocate( base, envp, "Executable" ); ret = DoRelocate( base, NULL, "Executable" ); if( ret == 0 ) { SysDebug("ld-acess - SoMain: Relocate failed, base=0x%x\n", base); @@ -49,7 +50,10 @@ void *SoMain(void *base, int argc, char **argv, char **envp) for(;;); } - SysDebug("ld-acess - SoMain: ret = %p", ret); + // Call queued entry points (from libraries) + CallQueuedEntrypoints(envp); + + SysDebug("ld-acess - SoMain: Program entry %p", ret); return ret; } -- 2.20.1