-/*\r
- * AcessOS 1 - Dynamic Loader\r
- * By thePowersGang\r
- */\r
-#include "common.h"\r
-#include "elf32.h"\r
+/*
+ * Acess2 Dynamic Linker
+ * - By John Hodge (thePowersGang)
+ *
+ * elf.c
+ * - ELF32/ELF64 relocation
+ */
+#ifndef DEBUG // This code is #include'd from the kernel, so DEBUG may already be defined
+# define DEBUG 0
+#endif
+
+#ifndef PAGE_SIZE
+# define PAGE_SIZE 4096
+#endif
-#define DEBUG 0
+#include "common.h"
+#include <stdint.h>
+#include "elf32.h"
+#include "elf64.h"
-#if DEBUG\r
-# define DEBUGS(v...) SysDebug(v)\r
+#if DEBUG
+# define DEBUGS(v...) SysDebug("ld-acess - " v)
#else
# define DEBUGS(...)
#endif
-\r
+
+#ifndef DISABLE_ELF64
+# define SUPPORT_ELF64
+#endif
+
// === CONSTANTS ===
-#if DEBUG\r
-//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"};\r
+#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"};
-#endif\r
-\r
-// === PROTOTYPES ===\r
-void elf_doRelocate(Uint r_info, Uint32 *ptr, Uint32 addend, Elf32_Sym *symtab, Uint base);\r
-Uint ElfHashString(char *name);\r
-\r
-// === CODE ===\r
-/**\r
- \fn int ElfRelocate(void *Base, char **envp, char *Filename)\r
- \brief Relocates a loaded ELF Executable\r
-*/\r
-int ElfRelocate(void *Base, char **envp, char *Filename)\r
-{\r
- Elf32_Ehdr *hdr = Base;\r
- Elf32_Phdr *phtab;\r
- int i, j; // Counters\r
- char *libPath;\r
- Uint iRealBase = -1;\r
- Uint iBaseDiff;\r
- int iSegmentCount;\r
- int iSymCount;\r
- Elf32_Rel *rel = NULL;\r
- Elf32_Rela *rela = NULL;\r
- Uint32 *pltgot = NULL;\r
- void *plt = NULL;\r
- int relSz=0, relEntSz=8;\r
- int relaSz=0, relaEntSz=8;\r
- int pltSz=0, pltType=0;\r
- Elf32_Dyn *dynamicTab = NULL; // Dynamic Table Pointer\r
- char *dynstrtab = NULL; // .dynamic String Table\r
- Elf32_Sym *dynsymtab;\r
- \r
- DEBUGS("ElfRelocate: (Base=0x%x)\n", Base);\r
- \r
- // Check magic header\r
- \r
- \r
- // Parse Program Header to get Dynamic Table\r
- phtab = Base + hdr->phoff;\r
- iSegmentCount = hdr->phentcount;\r
- for(i=0;i<iSegmentCount;i++)\r
- {\r
- // Determine linked base address\r
- if(phtab[i].Type == PT_LOAD && iRealBase > phtab[i].VAddr)\r
- iRealBase = phtab[i].VAddr;\r
- \r
- // Find Dynamic Section\r
- if(phtab[i].Type == PT_DYNAMIC) {\r
- if(dynamicTab) {\r
- DEBUGS(" WARNING - elf_relocate: Multiple PT_DYNAMIC segments\n");\r
- continue;\r
- }\r
- dynamicTab = (void *) phtab[i].VAddr;\r
- j = i; // Save Dynamic Table ID\r
- }\r
- }\r
- \r
- // Page Align real base\r
- iRealBase &= ~0xFFF;\r
- DEBUGS(" elf_relocate: True Base = 0x%x, Compiled Base = 0x%x\n", Base, iRealBase);\r
- \r
- // Adjust "Real" Base\r
- iBaseDiff = (Uint)Base - iRealBase;\r
- \r
- hdr->entrypoint += iBaseDiff; // Adjust Entrypoint\r
- \r
- // Check if a PT_DYNAMIC segement was found\r
- if(!dynamicTab) {\r
- SysDebug(" elf_relocate: No PT_DYNAMIC segment in image, returning\n");\r
- return hdr->entrypoint;\r
- }\r
- \r
- // Adjust Dynamic Table\r
- dynamicTab = (void *) ((Uint)dynamicTab + iBaseDiff);\r
+#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 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);
+#ifdef SUPPORT_ELF64
+void *Elf64Relocate(void *Base, char **envp, const char *Filename);
+ int Elf64GetSymbol(void *Base, const char *Name, void **Ret, size_t *Size);
+#endif
+uint32_t ElfHashString(const char *name);
+
+// === CODE ===
+/**
+ * \fn int ElfRelocate(void *Base, char **envp, const char *Filename)
+ * \brief Relocates a loaded ELF Executable
+ */
+void *ElfRelocate(void *Base, char **envp, const char *Filename)
+{
+ Elf32_Ehdr *hdr = Base;
+
+ switch(hdr->e_ident[4])
+ {
+ case ELFCLASS32:
+ return Elf32Relocate(Base, envp, Filename);
+#ifdef SUPPORT_ELF64
+ case ELFCLASS64:
+ return Elf64Relocate(Base, envp, Filename);
+#endif
+ default:
+ SysDebug("ld-acess - ElfRelocate: Unknown file class %i", hdr->e_ident[4]);
+ return NULL;
+ }
+}
+
+/**
+ * \fn int ElfGetSymbol(Uint Base, const char *name, void **ret)
+ */
+int ElfGetSymbol(void *Base, const char *Name, void **ret, size_t *Size)
+{
+ Elf32_Ehdr *hdr = Base;
+
+ switch(hdr->e_ident[4])
+ {
+ case ELFCLASS32:
+ return Elf32GetSymbol(Base, Name, ret, Size);
+#ifdef SUPPORT_ELF64
+ case ELFCLASS64:
+ return Elf64GetSymbol(Base, Name, ret, Size);
+#endif
+ default:
+ SysDebug("ld-acess - ElfRelocate: Unknown file class %i", hdr->e_ident[4]);
+ return 0;
+ }
+}
+
+int elf_doRelocate_386(uint32_t r_info, uint32_t *ptr, Elf32_Addr addend, int type,
+ int bRela, const char *Sym, intptr_t iBaseDiff)
+{
+ void *symval;
+ switch( type )
+ {
+ // 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);
+ *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 );
+ *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:
+ 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);
+ *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;
+ 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);
+ memcpy(ptr, symval, size);
+ break; }
+
+ default:
+ SysDebug("elf_doRelocate_386: Unknown relocation %i", type);
+ 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)
+{
+ uint32_t val;
+ switch(type)
+ {
+ // (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;
+ *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;
+ *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;
+ *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; }
+ // 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') {
+ // TODO: Get delta for a symbol
+ SysDebug("elf_doRelocate_arm: TODO - Implment R_ARM_RELATIVE for symbols");
+ return 2;
+ }
+ else {
+ *ptr = iBaseDiff + addend;
+ }
+ break;
+ default:
+ SysDebug("elf_doRelocate_arm: Unknown Relocation, %i", type);
+ 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)
+{
+ return 1;
+}
+
+void *Elf32Relocate(void *Base, char **envp, const char *Filename)
+{
+ Elf32_Ehdr *hdr = Base;
+ Elf32_Phdr *phtab;
+ int i, j; // Counters
+ char *libPath;
+ intptr_t iRealBase = -1;
+ intptr_t iBaseDiff;
+ int iSegmentCount;
+// int iSymCount;
+ Elf32_Rel *rel = NULL;
+ Elf32_Rela *rela = NULL;
+ void *plt = NULL;
+ int relSz=0, relEntSz=8;
+ 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);
+
+ // Check magic header
+
+
+ // Parse Program Header to get Dynamic Table
+ phtab = (void*)( (uintptr_t)Base + hdr->phoff );
+ iSegmentCount = hdr->phentcount;
+ for(i=0;i<iSegmentCount;i++)
+ {
+ // Determine linked base address
+ if(phtab[i].Type == PT_LOAD && iRealBase > phtab[i].VAddr)
+ iRealBase = phtab[i].VAddr;
+
+ // Find Dynamic Section
+ if(phtab[i].Type == PT_DYNAMIC) {
+ if(dynamicTab) {
+ DEBUGS(" WARNING - elf_relocate: Multiple PT_DYNAMIC segments");
+ continue;
+ }
+ dynamicTab = (void *) (intptr_t) phtab[i].VAddr;
+ j = i; // Save Dynamic Table ID
+ }
+ }
+
+ // Page Align real base
+ iRealBase &= ~0xFFF;
+ DEBUGS(" elf_relocate: 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);
+ return (void *)(intptr_t)(hdr->entrypoint + iBaseDiff);
+ }
+
+ // Allow writing to read-only segments, just in case they need to be relocated
+ // - Will be reversed at the end of the function
+ for( i = 0; i < iSegmentCount; i ++ )
+ {
+ if(phtab[i].Type == PT_LOAD && !(phtab[i].Flags & PF_W) ) {
+ uintptr_t addr = phtab[i].VAddr + iBaseDiff;
+ uintptr_t end = addr + phtab[i].MemSize;
+ for( ; addr < end; addr += PAGE_SIZE )
+ _SysSetMemFlags(addr, 0, 1); // Unset RO
+ }
+ }
+
+ // Adjust Dynamic Table
+ dynamicTab = (void *)( (intptr_t)dynamicTab + iBaseDiff );
- // === Get Symbol table and String Table ===\r
- for( j = 0; dynamicTab[j].d_tag != DT_NULL; j++)\r
+ // === Get Symbol table and String Table ===
+ dynsymtab = NULL;
+ for( j = 0; dynamicTab[j].d_tag != DT_NULL; j++)
{
switch(dynamicTab[j].d_tag)
{
- // --- Symbol Table ---\r
- case DT_SYMTAB:\r
- DEBUGS(" elf_relocate: DYNAMIC Symbol Table 0x%x (0x%x)\n",\r
- dynamicTab[j].d_val, dynamicTab[j].d_val + iBaseDiff);\r
- dynamicTab[j].d_val += iBaseDiff;\r
- dynsymtab = (void*)(dynamicTab[j].d_val);\r
- hdr->misc.SymTable = dynamicTab[j].d_val; // Saved in unused bytes of ident\r
- break;\r
- // --- String Table ---\r
- case DT_STRTAB:\r
- DEBUGS(" elf_relocate: DYNAMIC String Table 0x%x (0x%x)\n",\r
- dynamicTab[j].d_val, dynamicTab[j].d_val + iBaseDiff);\r
- dynamicTab[j].d_val += iBaseDiff;\r
- dynstrtab = (void*)(dynamicTab[j].d_val);\r
- break;\r
- // --- Hash Table --\r
- case DT_HASH:\r
- dynamicTab[j].d_val += iBaseDiff;\r
- iSymCount = ((Uint*)(dynamicTab[j].d_val))[1];\r
- hdr->misc.HashTable = dynamicTab[j].d_val; // Saved in unused bytes of ident\r
+ // --- Symbol Table ---
+ case DT_SYMTAB:
+ DEBUGS(" elf_relocate: DYNAMIC Symbol Table 0x%x (0x%x)",
+ dynamicTab[j].d_val, dynamicTab[j].d_val + iBaseDiff);
+ if(iBaseDiff != 0) dynamicTab[j].d_val += iBaseDiff;
+ dynsymtab = (void*)(intptr_t)dynamicTab[j].d_val;
+ 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);
+ if(iBaseDiff != 0) dynamicTab[j].d_val += iBaseDiff;
+ dynstrtab = (void*)(intptr_t)dynamicTab[j].d_val;
+ break;
+ // --- Hash Table --
+ case DT_HASH:
+ if(iBaseDiff != 0) dynamicTab[j].d_val += iBaseDiff;
+// iSymCount = ((Elf32_Word*)(intptr_t)dynamicTab[j].d_val)[1];
break;
}
}
-\r
- if(dynsymtab == NULL) {\r
- SysDebug("ld-acess.so - WARNING: No Dynamic Symbol table, returning\n");\r
- return hdr->entrypoint;\r
- }\r
- \r
- // Alter Symbols to true base\r
- for(i=0;i<iSymCount;i++)\r
- {\r
- dynsymtab[i].value += iBaseDiff;
- dynsymtab[i].nameOfs += (Uint)dynstrtab;\r
- //DEBUGS("elf_relocate: Sym '%s' = 0x%x (relocated)\n", dynsymtab[i].name, dynsymtab[i].value);\r
- }\r
-
+
+ if(dynsymtab == NULL) {
+ SysDebug("ld-acess.so - WARNING: No Dynamic Symbol table in %p, returning", hdr);
+ return (void *)(intptr_t) (hdr->entrypoint + iBaseDiff);
+ }
+
// === Add to loaded list (can be imported now) ===
- AddLoaded( Filename, (Uint)Base );
-
- // === Parse Relocation Data ===\r
- DEBUGS(" elf_relocate: dynamicTab = 0x%x\n", dynamicTab);\r
- for( j = 0; dynamicTab[j].d_tag != DT_NULL; j++)\r
- {\r
- switch(dynamicTab[j].d_tag)\r
- {\r
- // --- Shared Library Name ---\r
- case DT_SONAME:\r
- DEBUGS(" elf_relocate: .so Name '%s'\n", dynstrtab+dynamicTab[j].d_val);\r
- break;\r
- // --- Needed Library ---\r
- case DT_NEEDED:\r
- libPath = dynstrtab + dynamicTab[j].d_val;\r
- DEBUGS(" Required Library '%s'\n", libPath);\r
- if(LoadLibrary(libPath, NULL, envp) == 0) {\r
- #if DEBUG\r
- DEBUGS(" elf_relocate: Unable to load '%s'\n", libPath);\r
- #else\r
- SysDebug("Unable to load required library '%s'\n", libPath);\r
- #endif\r
- return 0;\r
- }\r
- break;\r
- // --- PLT/GOT ---\r
- case DT_PLTGOT: pltgot = (void*)iBaseDiff+(dynamicTab[j].d_val); break;\r
- case DT_JMPREL: plt = (void*)(iBaseDiff+dynamicTab[j].d_val); break;\r
- case DT_PLTREL: pltType = dynamicTab[j].d_val; break;\r
- case DT_PLTRELSZ: pltSz = dynamicTab[j].d_val; break;\r
- \r
- // --- Relocation ---\r
- case DT_REL: rel = (void*)(iBaseDiff + dynamicTab[j].d_val); break;\r
- case DT_RELSZ: relSz = dynamicTab[j].d_val; break;\r
- case DT_RELENT: relEntSz = dynamicTab[j].d_val; break;\r
- case DT_RELA: rela = (void*)(iBaseDiff + dynamicTab[j].d_val); break;\r
- case DT_RELASZ: relaSz = dynamicTab[j].d_val; break;\r
- case DT_RELAENT: relaEntSz = dynamicTab[j].d_val; break;\r
- \r
- // --- Symbol Table ---\r
- case DT_SYMTAB:\r
- // --- Hash Table ---\r
- case DT_HASH:\r
- // --- String Table ---\r
- case DT_STRTAB:\r
- break;\r
- \r
- // --- Unknown ---\r
- default:\r
- if(dynamicTab[j].d_tag > DT_JMPREL) continue;\r
- //DEBUGS(" elf_relocate: %i-%i = %s,0x%x\n",\r
- // i,j, csaDT_NAMES[dynamicTab[j].d_tag],dynamicTab[j].d_val);\r
- break;\r
- }\r
- }\r
- \r
- DEBUGS(" elf_relocate: Beginning Relocation\n");\r
- \r
- // Parse Relocation Entries\r
- if(rel && relSz)\r
- {\r
- Uint32 *ptr;\r
- DEBUGS(" elf_relocate: rel=0x%x, relSz=0x%x, relEntSz=0x%x\n", rel, relSz, relEntSz);\r
- j = relSz / relEntSz;\r
- for( i = 0; i < j; i++ )\r
+ AddLoaded( Filename, Base );
+
+ // === Parse Relocation Data ===
+ DEBUGS(" elf_relocate: dynamicTab = 0x%x", dynamicTab);
+ for( j = 0; dynamicTab[j].d_tag != DT_NULL; j++)
+ {
+ switch(dynamicTab[j].d_tag)
{
- //DEBUGS(" Rel %i: 0x%x+0x%x\n", i, iBaseDiff, rel[i].r_offset);\r
- ptr = (void*)(iBaseDiff + rel[i].r_offset);\r
- elf_doRelocate(rel[i].r_info, ptr, *ptr, dynsymtab, iBaseDiff);\r
- }\r
- }\r
- // Parse Relocation Entries\r
- if(rela && relaSz)\r
- {\r
- Uint32 *ptr;\r
- DEBUGS(" elf_relocate: rela=0x%x, relaSz=0x%x, relaEntSz=0x%x\n", rela, relaSz, relaEntSz);\r
- j = relaSz / relaEntSz;\r
- for( i = 0; i < j; i++ )\r
- {\r
- ptr = (void*)(iBaseDiff + rela[i].r_offset);\r
- elf_doRelocate(rel[i].r_info, ptr, rela[i].r_addend, dynsymtab, iBaseDiff);\r
- }\r
- }\r
- \r
- // === Process PLT (Procedure Linkage Table) ===\r
- if(plt && pltSz)\r
- {\r
- Uint32 *ptr;\r
- DEBUGS(" elf_relocate: Relocate PLT, plt=0x%x\n", plt);\r
- if(pltType == DT_REL)\r
- {\r
- Elf32_Rel *pltRel = plt;\r
- j = pltSz / sizeof(Elf32_Rel);\r
- DEBUGS(" elf_relocate: PLT Reloc Type = Rel, %i entries\n", j);\r
- for(i=0;i<j;i++)\r
- {\r
- ptr = (void*)(iBaseDiff + pltRel[i].r_offset);\r
- elf_doRelocate(pltRel[i].r_info, ptr, *ptr, dynsymtab, iRealBase);\r
- }\r
- }\r
- else\r
- {\r
- Elf32_Rela *pltRela = plt;\r
- j = pltSz / sizeof(Elf32_Rela);\r
- DEBUGS(" elf_relocate: PLT Reloc Type = Rela, %i entries\n", j);\r
- for(i=0;i<j;i++)\r
- {\r
- ptr = (void*)(iRealBase + pltRela[i].r_offset);\r
- elf_doRelocate(pltRela[i].r_info, ptr, pltRela[i].r_addend, dynsymtab, iRealBase);\r
- }\r
- }\r
- }\r
- \r
- DEBUGS("ElfRelocate: RETURN 0x%x", hdr->entrypoint);\r
- return hdr->entrypoint;\r
-}\r
-\r
-void elf_doRelocate(Uint r_info, Uint32 *ptr, Uint32 addend, Elf32_Sym *symtab, Uint base)\r
-{\r
- int type = ELF32_R_TYPE(r_info);\r
- int sym = ELF32_R_SYM(r_info);\r
- Uint32 val;\r
- switch( type )\r
- {\r
- // Standard 32 Bit Relocation (S+A)\r
- case R_386_32:\r
- val = GetSymbol( symtab[sym].name );\r
- DEBUGS(" elf_doRelocate: R_386_32 *0x%x += 0x%x('%s')\n",\r
- ptr, val, symtab[sym].name);\r
- *ptr = val + addend;\r
- break;\r
- \r
- // 32 Bit Relocation wrt. Offset (S+A-P)\r
- case R_386_PC32:\r
- DEBUGS(" elf_doRelocate: #%i: '%s'\n", sym, symtab[sym].name);\r
- val = GetSymbol( symtab[sym].name );\r
- DEBUGS(" elf_doRelocate: R_386_PC32 *0x%x = 0x%x + 0x%x - 0x%x\n",\r
- ptr, *ptr, val, (Uint)ptr );\r
- *ptr = val + addend - (Uint)ptr;\r
- //*ptr = val + addend - ((Uint)ptr - base);\r
+ // --- Shared Library Name ---
+ case DT_SONAME:
+ DEBUGS(" elf_relocate: .so Name '%s'", dynstrtab+dynamicTab[j].d_val);
+ break;
+ // --- Needed Library ---
+ case DT_NEEDED:
+ libPath = dynstrtab + dynamicTab[j].d_val;
+ DEBUGS(" 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");
+ 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;
+
+ // --- 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;
+
+ // --- Symbol Table ---
+ case DT_SYMTAB:
+ // --- Hash Table ---
+ case DT_HASH:
+ // --- String Table ---
+ case DT_STRTAB:
+ break;
+
+ // --- Unknown ---
+ default:
+ if(dynamicTab[j].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");
+
+ int fail = 0;
+
+ switch(hdr->machine)
+ {
+ case EM_386:
+ do_relocate = elf_doRelocate_386;
break;
-\r
- // Absolute Value of a symbol (S)\r
- case R_386_GLOB_DAT:\r
- case R_386_JMP_SLOT:
- DEBUGS(" elf_doRelocate: #%i: '%s'\n", sym, symtab[sym].name);\r
- val = GetSymbol( symtab[sym].name );\r
- DEBUGS(" elf_doRelocate: %s *0x%x = 0x%x\n", csaR_NAMES[type], ptr, val);\r
- *ptr = val;\r
- break;\r
-\r
- // Base Address (B+A)\r
- case R_386_RELATIVE:\r
- DEBUGS(" elf_doRelocate: R_386_RELATIVE *0x%x = 0x%x + 0x%x\n", ptr, base, addend);\r
- *ptr = base + addend;\r
- break;\r
- \r
- default:\r
- DEBUGS(" elf_doRelocate: Rel 0x%x: 0x%x,%s\n", ptr, sym, csaR_NAMES[type]);\r
- break;\r
- }\r
- \r
+ case EM_ARM:
+ do_relocate = elf_doRelocate_arm;
+ break;
+ default:
+ SysDebug("Elf32Relocate: Unknown machine type %i", hdr->machine);
+ do_relocate = elf_doRelocate_unk;
+ fail = 1;
+ break;
+ }
+
+ DEBUGS("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);
+
+ // Parse Relocation Entries
+ if(rel && relSz)
+ {
+ Elf32_Word *ptr;
+ DEBUGS(" elf_relocate: rel=0x%x, relSz=0x%x, relEntSz=0x%x", rel, relSz, relEntSz);
+ j = relSz / relEntSz;
+ for( i = 0; i < j; 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);
+ }
+ }
+ // Parse Relocation Entries
+ if(rela && relaSz)
+ {
+ Elf32_Word *ptr;
+ DEBUGS(" elf_relocate: rela=0x%x, relaSz=0x%x, relaEntSz=0x%x", rela, relaSz, relaEntSz);
+ j = relaSz / relaEntSz;
+ for( i = 0; i < j; i++ )
+ {
+ ptr = (void*)(iBaseDiff + rela[i].r_offset);
+ fail |= _doRelocate(rel[i].r_info, ptr, 1, rela[i].r_addend);
+ }
+ }
+
+ // === Process PLT (Procedure Linkage Table) ===
+ if(plt && pltSz)
+ {
+ Elf32_Word *ptr;
+ DEBUGS(" elf_relocate: Relocate PLT, plt=0x%x", plt);
+ if(pltType == DT_REL)
+ {
+ Elf32_Rel *pltRel = plt;
+ j = pltSz / sizeof(Elf32_Rel);
+ DEBUGS(" elf_relocate: PLT Reloc Type = Rel, %i entries", j);
+ for(i=0;i<j;i++)
+ {
+ ptr = (void*)(iBaseDiff + pltRel[i].r_offset);
+ fail |= _doRelocate(pltRel[i].r_info, ptr, 0, *ptr);
+ }
+ }
+ else
+ {
+ Elf32_Rela *pltRela = plt;
+ j = pltSz / sizeof(Elf32_Rela);
+ DEBUGS(" elf_relocate: PLT Reloc Type = Rela, %i entries", j);
+ for(i=0;i<j;i++)
+ {
+ ptr = (void*)(iRealBase + pltRela[i].r_offset);
+ fail |= _doRelocate(pltRela[i].r_info, ptr, 1, pltRela[i].r_addend);
+ }
+ }
+ }
+
+ // Re-set readonly
+ for( i = 0; i < iSegmentCount; i ++ )
+ {
+ // If load and not writable
+ if(phtab[i].Type == PT_LOAD && !(phtab[i].Flags & PF_W) ) {
+ uintptr_t addr = phtab[i].VAddr + iBaseDiff;
+ uintptr_t end = addr + phtab[i].MemSize;
+ for( ; addr < end; addr += PAGE_SIZE )
+ _SysSetMemFlags(addr, 1, 1); // Unset RO
+ }
+ }
+
+ if( fail ) {
+ DEBUGS("ElfRelocate: Failure");
+ return NULL;
+ }
+
+ #undef _doRelocate
+
+ DEBUGS("ElfRelocate: RETURN 0x%x to %p", hdr->entrypoint + iBaseDiff, __builtin_return_address(0));
+ return (void*)(intptr_t)( hdr->entrypoint + iBaseDiff );
}
-\r
-/**\r
- * \fn int ElfGetSymbol(Uint Base, char *name, Uint *ret)\r
- */
-int ElfGetSymbol(Uint Base, char *Name, Uint *ret)
+
+int Elf32GetSymbol(void *Base, const char *Name, void **ret, size_t *Size)
{
- Elf32_Ehdr *hdr = (void*)Base;\r
- Elf32_Sym *symtab;
- int nbuckets = 0;\r
- int iSymCount = 0;
- int i;\r
- Uint *pBuckets;\r
- Uint *pChains;\r
- Uint iNameHash;
-\r
- //DEBUGS("ElfGetSymbol: (Base=0x%x, Name='%s')\n", Base, Name);\r
-\r
- // Catch the current executable\r
- #if 0\r
- if( !hdr->misc.HashTable )\r
- {\r
- Elf32_Phdr *phtab;\r
- Elf32_Dyn *dynTab = NULL;\r
- int j;\r
- \r
- // Locate the tables\r
- phtab = (void*)( Base + hdr->phoff );\r
- for( i = 0; i < hdr->phentcount; i ++ )\r
- {\r
- if( phtab[i].Type == PT_DYNAMIC ) {\r
- dynTab = (void*)phtab[i].VAddr;\r
- break ;\r
- }\r
- }\r
- if( !dynTab ) {\r
- SysDebug("ERROR - Unable to find DYNAMIC segment in %p", (void*)Base);\r
- return 0;\r
- }\r
- \r
- for( j = 0; dynTab[j].d_tag != DT_NULL; j++)\r
- {\r
- switch(dynTab[j].d_tag)\r
- {\r
- // --- Symbol Table ---\r
- case DT_SYMTAB:\r
- hdr->misc.SymTable = dynTab[j].d_val;\r
- break;\r
- // --- Hash Table --\r
- case DT_HASH:\r
- hdr->misc.HashTable = dynTab[j].d_val;\r
- break;\r
- }\r
- }\r
- }\r
- #endif\r
- \r
- if( !hdr->misc.SymTable || !hdr->misc.HashTable ) {\r
- return 0;\r
- }\r
-\r
- pBuckets = (void *) hdr->misc.HashTable;\r
- symtab = (void *) hdr->misc.SymTable;\r
+ 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;
+ int i;
+
+ // Locate the tables
+ phtab = (void*)( (uintptr_t)Base + hdr->phoff );
+ for( i = 0; i < hdr->phentcount; i ++ )
+ {
+ if(phtab[i].Type == PT_LOAD && iBaseDiff > phtab[i].VAddr)
+ iBaseDiff = phtab[i].VAddr;
+ if( phtab[i].Type == PT_DYNAMIC ) {
+ dynTab = (void*)(intptr_t)phtab[i].VAddr;
+ }
+ }
+ if( !dynTab ) {
+ SysDebug("ERROR - Unable to find DYNAMIC segment in %p", Base);
+ return 0;
+ }
+ iBaseDiff = (intptr_t)Base - iBaseDiff; // Make iBaseDiff actually the diff
+ dynTab = (void*)( (intptr_t)dynTab + iBaseDiff );
+ for( i = 0; dynTab[i].d_tag != DT_NULL; i++)
+ {
+ switch(dynTab[i].d_tag)
+ {
+ // --- Symbol Table ---
+ case DT_SYMTAB:
+ symtab = (void*)(intptr_t) dynTab[i].d_val; // Rebased in Relocate
+ break;
+ case DT_STRTAB:
+ dynstrtab = (void*)(intptr_t) dynTab[i].d_val;
+ break;
+ // --- Hash Table --
+ case DT_HASH:
+ pBuckets = (void*)(intptr_t) dynTab[i].d_val;
+ break;
+ }
+ }
- nbuckets = pBuckets[0];\r
- iSymCount = pBuckets[1];\r
- pBuckets = &pBuckets[2];\r
- pChains = &pBuckets[ nbuckets ];\r
- \r
+ if( !symtab ) {
+ SysDebug("ERRO - No DT_SYMTAB in %p", Base);
+ return 0;
+ }
+ if( !pBuckets ) {
+ SysDebug("ERRO - No DT_HASH in %p", Base);
+ return 0;
+ }
+ if( !dynstrtab ) {
+ SysDebug("ERRO - No DT_STRTAB in %p", Base);
+ return 0;
+ }
+
+ // ... ok... maybe they haven't been relocated
+ 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");
+ }
+
+ nbuckets = pBuckets[0];
+// iSymCount = pBuckets[1];
+ pBuckets = &pBuckets[2];
+ pChains = &pBuckets[ nbuckets ];
+
// Get hash
- iNameHash = ElfHashString(Name);\r
- iNameHash %= nbuckets;\r
- //DEBUGS(" ElfGetSymbol: iNameHash = 0x%x\n", iNameHash);\r
-
- // Walk Chain\r
- i = pBuckets[ iNameHash ];\r
- //DEBUGS(" ElfGetSymbol: strcmp(Name, \"%s\")\n", symtab[i].name);\r
- if(symtab[i].shndx != SHN_UNDEF && strcmp(symtab[i].name, Name) == 0) {\r
- *ret = symtab[ i ].value;\r
- return 1;\r
- }\r
- \r
- //DEBUGS(" ElfGetSymbol: Hash of first = 0x%x\n", ElfHashString( symtab[i].name ) % nbuckets);\r
- while(pChains[i] != STN_UNDEF)\r
- {\r
- //DEBUGS(" pChains[%i] = %i\n", i, pChains[i]);\r
- i = pChains[i];\r
- //DEBUGS(" ElfGetSymbol: strcmp(Name, \"%s\")\n", symtab[ i ].name);\r
- if(symtab[i].shndx != SHN_UNDEF && strcmp(symtab[ i ].name, Name) == 0) {\r
- //DEBUGS("ElfGetSymbol: RETURN 1, '%s' = 0x%x\n", symtab[ i ].name, symtab[ i ].value);\r
- *ret = symtab[ i ].value;\r
- return 1;\r
- }\r
- }\r
- \r
- //DEBUGS("ElfGetSymbol: RETURN 0, Symbol '%s' not found\n", Name);
+ iNameHash = ElfHashString(Name);
+ iNameHash %= nbuckets;
+
+ // Walk Chain
+ i = pBuckets[ iNameHash ];
+ if(symtab[i].shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[i].nameOfs, Name) == 0) {
+ *ret = (void*)( (uintptr_t) symtab[ i ].value + iBaseDiff );
+ if(Size) *Size = symtab[i].size;
+ return 1;
+ }
+
+ while(pChains[i] != STN_UNDEF)
+ {
+ i = pChains[i];
+ if(symtab[i].shndx != SHN_UNDEF && strcmp(dynstrtab + symtab[ i ].nameOfs, Name) == 0) {
+ *ret = (void*)( (uintptr_t)symtab[ i ].value + iBaseDiff );
+ if(Size) *Size = symtab[i].size;
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+#ifdef SUPPORT_ELF64
+typedef int (*t_elf64_doreloc)(void *Base, const char *strtab, Elf64_Sym *symtab, Elf64_Xword r_info, void *ptr, Elf64_Sxword addend);
+
+int _Elf64DoReloc_X86_64(void *Base, const char *strtab, Elf64_Sym *symtab, Elf64_Xword r_info, void *ptr, Elf64_Sxword addend)
+{
+ int sym = ELF64_R_SYM(r_info);
+ int type = ELF64_R_TYPE(r_info);
+ const char *symname = strtab + symtab[sym].st_name;
+ void *symval;
+ //DEBUGS("_Elf64DoReloc: %s", symname);
+ switch( type )
+ {
+ case R_X86_64_NONE:
+ break;
+ case R_X86_64_64:
+ if( !GetSymbol(symname, &symval, 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;
+ memcpy(ptr, symval, size);
+ } break;
+ case R_X86_64_GLOB_DAT:
+ if( !GetSymbol(symname, &symval, NULL) ) return 1;
+ *(uint64_t*)ptr = (uintptr_t)symval;
+ break;
+ case R_X86_64_JUMP_SLOT:
+ if( !GetSymbol(symname, &symval, NULL) ) return 1;
+ *(uint64_t*)ptr = (uintptr_t)symval;
+ break;
+ case R_X86_64_RELATIVE:
+ *(uint64_t*)ptr = (uintptr_t)Base + addend;
+ break;
+ default:
+ SysDebug("ld-acess - _Elf64DoReloc: Unknown relocation type %i", type);
+ return 2;
+ }
+ //DEBUGS("_Elf64DoReloc: - Good");
return 0;
-}\r
-\r
-Uint ElfHashString(char *name)\r
-{\r
- Uint h = 0, g;\r
- while(*name)\r
- {\r
- h = (h << 4) + *name++;\r
- if( (g = h & 0xf0000000) )\r
- h ^= g >> 24;\r
- h &= ~g;\r
- }\r
- return h;\r
-}\r
-\r
-#if 0\r
-unsigned long elf_hash(const unsigned char *name)\r
-{\r
- unsigned long h = 0, g;\r
- while (*name)\r
- {\r
- h = (h << 4) + *name++;\r
- if (g = h & 0xf0000000)\r
- h ^= g >> 24;\r
- h &= ~g;\r
- }\r
- return h;\r
-}\r
-#endif\r
+}
+
+void *Elf64Relocate(void *Base, char **envp, const char *Filename)
+{
+ int i;
+ Elf64_Ehdr *hdr = Base;
+ Elf64_Phdr *phtab;
+ Elf64_Dyn *dyntab = NULL;
+ Elf64_Addr compiledBase = -1, baseDiff;
+ Elf64_Sym *symtab = NULL;
+ char *strtab = NULL;
+ Elf64_Word *hashtab = NULL;
+ Elf64_Rel *rel = NULL;
+ int rel_count = 0;
+ Elf64_Rela *rela = NULL;
+ int rela_count = 0;
+ 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);
+
+ // Scan for the dynamic table (and find the compiled base)
+ phtab = (void*)((uintptr_t)Base + (uintptr_t)hdr->e_phoff);
+ for( i = 0; i < hdr->e_phnum; i ++ )
+ {
+ if(phtab[i].p_type == PT_DYNAMIC)
+ dyntab = (void *)(intptr_t)phtab[i].p_vaddr;
+ if(phtab[i].p_type == PT_LOAD && compiledBase > phtab[i].p_vaddr)
+ compiledBase = phtab[i].p_vaddr;
+ }
+
+ baseDiff = (uintptr_t)Base - compiledBase;
+
+ DEBUGS("baseDiff = %p", baseDiff);
+
+ if(dyntab == NULL) {
+ SysDebug(" Elf64Relocate: No PT_DYNAMIC segment in image %p, returning", Base);
+ return (void *)(uintptr_t)(hdr->e_entry + baseDiff);
+ }
+
+ dyntab = (void *)(uintptr_t)((uintptr_t)dyntab + baseDiff);
+
+ // Parse the dynamic table (first pass)
+ // - Search for String, Symbol and Hash tables
+ for(i = 0; dyntab[i].d_tag != DT_NULL; i ++)
+ {
+ switch(dyntab[i].d_tag)
+ {
+ case DT_SYMTAB:
+ dyntab[i].d_un.d_ptr += baseDiff;
+ symtab = (void *)(uintptr_t)dyntab[i].d_un.d_ptr;
+ break;
+ case DT_STRTAB:
+ dyntab[i].d_un.d_ptr += baseDiff;
+ strtab = (void *)(uintptr_t)dyntab[i].d_un.d_ptr;
+ break;
+ case DT_HASH:
+ dyntab[i].d_un.d_ptr += baseDiff;
+ hashtab = (void *)(uintptr_t)dyntab[i].d_un.d_ptr;
+ break;
+ }
+ }
+
+ if( !symtab || !strtab || !hashtab ) {
+ SysDebug("ld-acess - Elf64Relocate: Missing Symbol, string or hash table");
+ return NULL;
+ }
+
+ // Ready for symbol use
+ AddLoaded( Filename, Base );
+
+ // 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);
+ 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);
+ if(LoadLibrary(libPath, NULL, envp) == 0) {
+ SysDebug("ld-acess - Elf64Relocate: Unable to load '%s'", libPath);
+ return NULL;
+ }
+ } break;
+
+ // Relocation entries
+ case DT_REL:
+ dyntab[i].d_un.d_ptr += baseDiff;
+ rel = (void *)(uintptr_t)dyntab[i].d_un.d_ptr;
+ break;
+ case DT_RELSZ:
+ rel_count = dyntab[i].d_un.d_val / sizeof(Elf64_Rel);
+ break;
+ case DT_RELENT:
+ if( dyntab[i].d_un.d_val != sizeof(Elf64_Rel) ) {
+ SysDebug("ld-acess - Elf64Relocate: DT_RELENT(%i) != sizeof(Elf64_Rel)(%i)",
+ dyntab[i].d_un.d_val, sizeof(Elf64_Rel));
+ return NULL;
+ }
+ break;
+ case DT_RELA:
+ dyntab[i].d_un.d_ptr += baseDiff;
+ rela = (void *)(uintptr_t)dyntab[i].d_un.d_ptr;
+ break;
+ case DT_RELASZ:
+ rela_count = dyntab[i].d_un.d_val / sizeof(Elf64_Rela);
+ break;
+ case DT_RELAENT:
+ if( dyntab[i].d_un.d_val != sizeof(Elf64_Rela) ) {
+ SysDebug("ld-acess - Elf64Relocate: DT_RELAENT(%i) != sizeof(Elf64_Rela)(%i)",
+ dyntab[i].d_un.d_val, sizeof(Elf64_Rela));
+ return NULL;
+ }
+ break;
+ case DT_JMPREL:
+ dyntab[i].d_un.d_ptr += baseDiff;
+ pltrel = (void *)(uintptr_t)dyntab[i].d_un.d_ptr;
+ break;
+ case DT_PLTREL:
+ plt_type = dyntab[i].d_un.d_val;
+ break;
+ case DT_PLTRELSZ:
+ plt_size = dyntab[i].d_un.d_val;
+ break;
+ }
+ }
+
+ // Relocation function
+ t_elf64_doreloc fpElf64DoReloc = &_Elf64DoReloc_X86_64;
+ #define _Elf64DoReloc(info, ptr, addend) fpElf64DoReloc(Base, strtab, symtab, info, ptr, addend)
+
+ int fail = 0;
+ if( rel )
+ {
+ DEBUGS("rel_count = %i", rel_count);
+ for( i = 0; i < rel_count; i ++ )
+ {
+ uint64_t *ptr = (void *)(uintptr_t)( rel[i].r_offset + baseDiff );
+ fail |= _Elf64DoReloc( rel[i].r_info, ptr, *ptr);
+ }
+ }
+
+ if( rela )
+ {
+ DEBUGS("rela_count = %i", rela_count);
+ for( i = 0; i < rela_count; i ++ )
+ {
+ uint64_t *ptr = (void *)(uintptr_t)( rela[i].r_offset + baseDiff );
+ fail |= _Elf64DoReloc( rela[i].r_info, ptr, rela[i].r_addend );
+ }
+ }
+
+ if( pltrel && plt_type )
+ {
+ if( plt_type == DT_REL ) {
+ Elf64_Rel *plt = pltrel;
+ int count = plt_size / sizeof(Elf64_Rel);
+ DEBUGS("plt rel count = %i", count);
+ for( i = 0; i < count; i ++ )
+ {
+ uint64_t *ptr = (void *)(uintptr_t)( plt[i].r_offset + baseDiff );
+ fail |= _Elf64DoReloc( plt[i].r_info, ptr, *ptr);
+ }
+ }
+ else {
+ Elf64_Rela *plt = pltrel;
+ int count = plt_size / sizeof(Elf64_Rela);
+ DEBUGS("plt rela count = %i", count);
+ for( i = 0; i < count; i ++ )
+ {
+ uint64_t *ptr = (void *)(uintptr_t)( plt[i].r_offset + baseDiff );
+ fail |= _Elf64DoReloc( plt[i].r_info, ptr, plt[i].r_addend);
+ }
+ }
+ }
+
+ if( fail ) {
+ DEBUGS("Elf64Relocate: Failure");
+ return NULL;
+ }
+
+ {
+ void *ret = (void *)(uintptr_t)(hdr->e_entry + baseDiff);
+ DEBUGS("Elf64Relocate: Relocations done, return %p", ret);
+ return ret;
+ }
+}
+
+int Elf64GetSymbol(void *Base, const char *Name, void **Ret, size_t *Size)
+{
+ Elf64_Ehdr *hdr = Base;
+ Elf64_Sym *symtab;
+ int nbuckets = 0;
+// int iSymCount = 0;
+ int i;
+ Elf64_Word *pBuckets;
+ Elf64_Word *pChains;
+ uint32_t iNameHash;
+ const char *dynstrtab;
+ uintptr_t iBaseDiff = -1;
+
+ dynstrtab = NULL;
+ pBuckets = NULL;
+ symtab = NULL;
+
+ // Catch the current executable
+ if( !pBuckets )
+ {
+ Elf64_Phdr *phtab;
+ Elf64_Dyn *dynTab = NULL;
+ int j;
+
+ // Locate the tables
+ phtab = (void*)( (intptr_t)Base + (uintptr_t)hdr->e_phoff );
+ for( i = 0; i < hdr->e_phnum; i ++ )
+ {
+ if(phtab[i].p_type == PT_LOAD && iBaseDiff > phtab[i].p_vaddr)
+ iBaseDiff = phtab[i].p_vaddr;
+ if( phtab[i].p_type == PT_DYNAMIC ) {
+ dynTab = (void*)(intptr_t)phtab[i].p_vaddr;
+ }
+ }
+ if( !dynTab ) {
+ SysDebug("ERROR - Unable to find DYNAMIC segment in %p", Base);
+ return 0;
+ }
+ iBaseDiff = (intptr_t)Base - iBaseDiff; // Make iBaseDiff actually the diff
+ dynTab = (void*)( (intptr_t)dynTab + iBaseDiff );
+
+ for( j = 0; dynTab[j].d_tag != DT_NULL; j++)
+ {
+ switch(dynTab[j].d_tag)
+ {
+ // --- Symbol Table ---
+ case DT_SYMTAB:
+ symtab = (void*)(intptr_t) dynTab[j].d_un.d_val; // Rebased in Relocate
+ break;
+ case DT_STRTAB:
+ dynstrtab = (void*)(intptr_t) dynTab[j].d_un.d_val;
+ break;
+ // --- Hash Table --
+ case DT_HASH:
+ pBuckets = (void*)(intptr_t) dynTab[j].d_un.d_val;
+ break;
+ }
+ }
+ }
+
+ nbuckets = pBuckets[0];
+// iSymCount = pBuckets[1];
+ pBuckets = &pBuckets[2];
+ pChains = &pBuckets[ nbuckets ];
+
+ // Get hash
+ iNameHash = ElfHashString(Name);
+ iNameHash %= nbuckets;
+
+ // Walk Chain
+ i = pBuckets[ iNameHash ];
+ 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);
+ return 1;
+ }
+
+ while(pChains[i] != STN_UNDEF)
+ {
+ i = pChains[i];
+ 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);
+ return 1;
+ }
+ }
+
+ return 0;
+}
+#endif
+
+
+uint32_t ElfHashString(const char *name)
+{
+ uint32_t h = 0, g;
+ while(*name)
+ {
+ h = (h << 4) + *(uint8_t*)name++;
+ if( (g = h & 0xf0000000) )
+ h ^= g >> 24;
+ h &= ~g;
+ }
+ return h;
+}
+
git.ucc.asn.au / tpg / acess2.git / blobdiff
UCC git Repository :: git.ucc.asn.au