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-rw-r--r--mdk-stage1/dietlibc/libdl/_dl_main.c1059
1 files changed, 1059 insertions, 0 deletions
diff --git a/mdk-stage1/dietlibc/libdl/_dl_main.c b/mdk-stage1/dietlibc/libdl/_dl_main.c
new file mode 100644
index 000000000..8ecf44f0b
--- /dev/null
+++ b/mdk-stage1/dietlibc/libdl/_dl_main.c
@@ -0,0 +1,1059 @@
+#ifdef __OD_CLEAN_ROOM
+
+#define __DIET_LD_SO__
+
+/*
+ * this is the dietlibc libdl & dynamic-linker
+ *
+ * NEED to be compiled with -fPIC ...
+ */
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include "_dl_int.h"
+#include "_dl_rel.h"
+
+void _start(void); /* entry of lib... */
+
+static void (*fini_entry)(void)=0;
+static char **_dl_environ=0;
+static unsigned long loadaddr=0;
+static unsigned long prog_entry=0;
+
+static Elf_Phdr*prog_ph;
+static unsigned long prog_ph_size;
+static unsigned long prog_ph_num;
+
+static unsigned long at_uid;
+static unsigned long at_euid;
+static unsigned long at_gid;
+static unsigned long at_egid;
+static unsigned long at_pagesize;
+
+/* this are the "local syscalls" */
+void _dl_sys_exit(int val);
+int _dl_sys_read(int fd,char*buf,unsigned long len);
+int _dl_sys_write(int fd,char*buf,unsigned long len);
+int _dl_sys_open(const char*filename,int flags,int mode);
+int _dl_sys_close(int fd);
+void*_dl_sys_mmap(void*start,unsigned long length,int prot,int flags,int fd,unsigned long offset);
+int _dl_sys_munmap(void*start,unsigned long length);
+int _dl_sys_mprotect(const void*addr,unsigned long len,int prot);
+int _dl_sys_fstat(int filedes, struct stat *buf);
+
+extern char*strdup(const char*s);
+
+#ifdef __i386__
+
+asm(".text \n"
+".type _start,@function \n"
+"_start: \n"
+" movl %esp, %ebp # save stack \n"
+" movl (%ebp), %ecx # argc \n"
+" leal 4(%ebp), %esi # argv \n"
+" leal 4(%esi,%ecx,4), %eax # envp \n"
+
+"# PIC code \n"
+" call getpic \n"
+" addl $_GLOBAL_OFFSET_TABLE_, %ebx \n"
+
+"# for calculation of load addr, get 'relocated' address of _DYNAMIC \n"
+" leal _DYNAMIC@GOTOFF(%ebx), %edx \n"
+
+"# put parameter on stack and call _dl_main \n"
+" pushl %edx \n"
+" pushl %eax \n"
+" pushl %esi \n"
+" pushl %ecx \n"
+" call _dl_main \n"
+
+"# restore stack \n"
+" movl %ebp, %esp \n"
+
+"# get fini pointer \n"
+" movl fini_entry@GOTOFF(%ebx), %edx \n"
+
+"# clear callee-save-register like kernel \n"
+" xorl %ebx, %ebx \n"
+" xorl %ebp, %ebp \n"
+" xorl %edi, %edi \n"
+" xorl %esi, %esi \n"
+
+"# jump to program entry point \n"
+" jmp *%eax \n"
+
+"_dl_sys_read: \n"
+" movb $3,%al \n"
+" jmp _dl_sys_call3 \n"
+"_dl_sys_write: \n"
+" movb $4,%al \n"
+" jmp _dl_sys_call3 \n"
+"_dl_sys_open: \n"
+" movb $5,%al \n"
+" jmp _dl_sys_call3 \n"
+"_dl_sys_close: \n"
+" movb $6,%al \n"
+" jmp _dl_sys_call3 \n"
+"_dl_sys_mmap: \n"
+" movb $90,%al \n"
+" leal 4(%esp),%edx \n"
+" pushl %edx \n"
+" call _dl_sys_call3 \n"
+" popl %ecx \n"
+" ret \n"
+"_dl_sys_munmap: \n"
+" movb $91,%al \n"
+" jmp _dl_sys_call3 \n"
+"_dl_sys_fstat: \n"
+" movb $108,%al \n"
+" jmp _dl_sys_call3 \n"
+"_dl_sys_mprotect: \n"
+" movb $125,%al \n"
+" jmp _dl_sys_call3 \n"
+"_dl_sys_exit: \n"
+" movb $1,%al \n"
+"_dl_sys_call3: \n"
+" movzbl %al,%eax \n"
+" pushl %ebx \n"
+" movl %esp,%ebx \n"
+" movl 16(%ebx),%edx \n"
+" movl 12(%ebx),%ecx \n"
+" movl 8(%ebx),%ebx \n"
+" int $0x80 \n"
+" popl %ebx \n"
+" ret \n"
+
+".type _dl_jump,@function \n"
+"_dl_jump: \n"
+" pushl %eax # save register args... \n"
+" pushl %ecx \n"
+" pushl %edx \n"
+
+" push 16(%esp) # 2. arg from plt \n"
+" push 16(%esp) # 1. arg from plt \n"
+" call do_resolve \n"
+" add $8, %esp \n"
+
+" popl %edx # restore register args... \n"
+" popl %ecx \n"
+" xchgl %eax, (%esp) # restore eax and save function pointer (for return) \n"
+" ret $8 # remove arguments from plt and jump to REAL function \n"
+
+"# GET Position In Code :) \n"
+"getpic: movl (%esp), %ebx \n"
+" ret");
+
+static inline unsigned long* get_got(void) {
+ register unsigned long *got asm ("%ebx");
+ return got;
+}
+
+static inline int work_on_pltgot(struct _dl_handle*dh) {
+ /* declare _dl_jump static otherwise we have a GOT access BEFOR we have the resolver */
+ static void _dl_jump(void);
+ if ((dh->plt_rel)&&(!(dh->flags&RTLD_NOW))) {
+ unsigned long*tmp=dh->pltgot;
+ /* GOT */
+ tmp[0]+=(unsigned long)dh->mem_base; /* reloc dynamic pointer */
+ tmp[1] =(unsigned long)dh; /* the handle */
+ tmp[2] =(unsigned long)(_dl_jump); /* sysdep jump to do_resolve */
+ }
+ return 0;
+}
+
+#elif __arm__
+
+asm(".text \n"
+".type _start,function \n"
+"_start: \n"
+" mov r4, sp \n"
+" mov fp, #0 @ start new stack frame \n"
+
+" ldr a1, [sp], #4 @ argc \n"
+" mov a2, sp @ argv \n"
+
+" add a3, a2, a1, lsl #2 @ envp \n"
+" add a3, a3, #4 \n"
+
+" ldr sl, .L_got @ PIC code \n"
+"1: add sl, pc, sl \n"
+
+" ldr a4, .L_la @ get 'relocated' address of _DYNAMIC \n"
+" add a4, a4, sl \n"
+
+" bl _dl_main @ call _dl_main \n"
+
+" mov sp, r4 \n"
+
+" mov lr, a1 @ save program entry point \n"
+
+" ldr a1, [pc, #.L_fe-(.+8)] @ agrument 1: global fini entry \n"
+" ldr a1, [sl, a1] \n"
+
+" mov pc, lr \n"
+
+".L_got: .long _GLOBAL_OFFSET_TABLE_-(1b+8) \n"
+".L_la: .long _DYNAMIC(GOTOFF) \n"
+".L_fe: .long fini_entry(GOTOFF) \n"
+
+"_dl_sys_exit: \n"
+" swi #0x900001 @ exit \n"
+" eor pc, lr, lr @ OR DIE ! \n"
+" mov pc, lr \n"
+
+"_dl_sys_read: \n"
+" swi #0x900003 @ read \n"
+" mov pc, lr \n"
+"_dl_sys_write: \n"
+" swi #0x900004 @ write \n"
+" mov pc, lr \n"
+"_dl_sys_open: \n"
+" swi #0x900005 @ open \n"
+" mov pc, lr \n"
+"_dl_sys_close: \n"
+" swi #0x900006 @ close \n"
+" mov pc, lr \n"
+"_dl_sys_mmap: \n"
+" stmdb sp!,{r0,r1,r2,r3} \n"
+" mov r0, sp \n"
+" swi #0x900090 @ mmap \n"
+" add sp, sp, #16 \n"
+" mov pc, lr \n"
+"_dl_sys_munmap: \n"
+" swi #0x900091 @ munmap \n"
+" mov pc, lr \n"
+"_dl_sys_fstat: \n"
+" swi #0x900108 @ fstat \n"
+" mov pc, lr \n"
+"_dl_sys_mprotect: \n"
+" swi #0x900125 @ mprotect \n"
+" mov pc, lr \n"
+
+".type _dl_jump,function \n"
+"_dl_jump: \n"
+" stmdb sp!, {r0, r1, r2, r3} @ save arguments \n"
+
+" sub r1, ip, lr @ dyntab entry \n"
+" sub r1, r1, #4 \n"
+" add r1, r1, r1 \n"
+
+" ldr r0, [lr, #-4] @ dynlib handle \n"
+
+" bl do_resolve \n"
+
+" mov r12, r0 \n"
+" ldmia sp!, {r0, r1, r2, r3, lr} @ restore arguments \n"
+" mov pc, r12");
+
+static inline unsigned long* get_got(void) {
+ register unsigned long *got asm ("sl");
+ return got;
+}
+
+static inline int work_on_pltgot(struct _dl_handle*dh) {
+ /* declare _dl_jump static otherwise we have a GOT access BEFOR we have the resolver */
+ static void _dl_jump(void);
+ if ((dh->plt_rel)&&(!(dh->flags&RTLD_NOW))) {
+ unsigned long*tmp=dh->pltgot;
+ /* GOT */
+ tmp[0]+=(unsigned long)dh->mem_base; /* reloc dynamic pointer */
+ tmp[1] =(unsigned long)dh; /* the handle */
+ tmp[2] =(unsigned long)(_dl_jump); /* sysdep jump to do_resolve */
+ }
+ return 0;
+}
+
+#else
+#error "libdl: arch not supported"
+#endif
+
+static void*_dl_load(const char*fn,const char*pathname,int fd,int flags);
+
+/* here do the code includes */
+
+/* strncpy */
+static char*strncpy(register char*s,register const char*t,register unsigned long n) {
+ char *dest=s;
+ for(;n;--n) {
+ char ch=*t;
+ *s=ch;
+ if (ch==0) return dest;
+ ++s; ++t;
+ }
+ return 0;
+}
+
+/* strlen.c */
+static unsigned long strlen(register const char*s) {
+ register unsigned long i;
+ if (!s) return 0;
+ for (i=0; *s; ++s) ++i;
+ return i;
+}
+
+/* strcmp.c */
+static int strcmp(register const unsigned char*s,register const unsigned char*t) {
+ register char x;
+ for (;;) {
+ x = *s; if (x != *t) break; if (!x) break; ++s; ++t;
+ }
+ return ((int)(unsigned int)x) - ((int)(unsigned int)*t);
+}
+
+/* strcspn.c */
+static unsigned long strcspn(const char*s,const char*reject) {
+ unsigned long l=0;
+ int a=1,i,al=strlen(reject);
+ while((a)&&(*s)) {
+ for(i=0;(a)&&(i<al);++i) if (*s==reject[i]) a=0;
+ if (a) ++l;
+ ++s;
+ }
+ return l;
+}
+
+/* memcpy.c */
+static void*memcpy(void*dst,const void*src,unsigned long count) {
+ register char *d=dst;
+ register const char *s=src;
+ ++count;
+ while (--count) {
+ *d = *s;
+ ++d; ++s;
+ }
+ return dst;
+}
+
+/* memset.c */
+static void*memset(void*dst,int ch,unsigned long count) {
+ register char *d=dst;
+ ++count;
+ while (--count) {
+ *d=ch;
+ ++d;
+ }
+ return dst;
+}
+
+/* memcmp.c */
+static int memcmp(register const unsigned char*s,register const unsigned char*t,unsigned long count) {
+ register int r;
+ ++count;
+ while(--count) {
+ if ((r=(*s-*t))) return r;
+ ++s;
+ ++t;
+ }
+ return 0;
+}
+
+/* getenv.c */
+static char*getenv(const char*env) {
+ unsigned int i,len=strlen(env);
+ for (i=0;_dl_environ[i];++i) {
+ if ((memcmp(_dl_environ[i],env,len)==0) && (_dl_environ[i][len]=='='))
+ return _dl_environ[i]+len+1;
+ }
+ return 0;
+}
+
+/* basic debug output functions */
+static void pf(const char*s) { _dl_sys_write(2,(void*)s,strlen(s)); }
+static void ph(unsigned long l) {
+ const int max=(sizeof(unsigned long)<<1);
+ unsigned char buf[16];
+ int i;
+ for (i=max;i;l>>=4) {
+ register unsigned long v='0'|(l&15);
+ if (v>'9') v+=0x27;
+ buf[--i]=v;
+ }
+ _dl_sys_write(2,buf,max);
+}
+
+/* the never free strdup (internal) */
+static unsigned long _dl_lib_strdup_len=0;
+static char*_dl_lib_strdup_str;
+static char*_dl_lib_strdup(const char*s) {
+ char*ret=_dl_lib_strdup_str;
+ unsigned long l=strlen(s)+1;
+ if (_dl_lib_strdup_len<l) {
+ ret=(char*)_dl_sys_mmap(0,at_pagesize,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANONYMOUS,-1,0);
+ _dl_lib_strdup_len=at_pagesize;
+ }
+ _dl_lib_strdup_str=ret+l;
+ _dl_lib_strdup_len-=l;
+ memcpy(ret,s,l);
+ return ret;
+}
+
+#ifdef __GDB_SUPPORT__
+volatile void _dl_debug_state(void);
+/* gdb debug break point */
+void _dl_debug_state() {}
+
+/* gdb debug init stuff */
+struct r_debug _r_debug;
+static struct r_debug* _dl_debug_init(Elf_Addr dl_base) {
+ if (_r_debug.r_brk==0) {
+ _r_debug.r_version = 1;
+ _r_debug.r_ldbase = dl_base;
+ _r_debug.r_map = _dl_root_handle; /* this my be wrong */
+ _r_debug.r_brk = (Elf_Addr)&_dl_debug_state;
+ }
+ return &_r_debug;
+}
+#endif
+
+/* now reuse some unchanged sources */
+#include "dlerror.c"
+#include "_dl_alloc.c"
+
+#include "dlsym.c"
+
+#include "_dl_search.c"
+
+#include "_dl_open.c"
+#include "dlopen.c"
+
+#include "_dl_relocate.c"
+#include "_dl_queue.c"
+
+#include "dlclose.c"
+
+/* back to the "new" implementation */
+static void tt_fini(void) {
+ struct _dl_handle*tmp;
+#ifdef DEBUG
+ pf("dyn fini\n");
+#endif
+ for(tmp=_dl_root_handle;tmp;tmp=tmp->next)
+ if (tmp->fini) tmp->fini();
+}
+
+/* exit ! */
+static void _DIE_() { _dl_sys_exit(213); }
+
+/* lazy function resolver */
+static unsigned long do_resolve(struct _dl_handle*dh,unsigned long off) {
+ _dl_rel_t *tmp = ((void*)dh->plt_rel)+off;
+ int sym=ELF_R_SYM(tmp->r_info);
+ register unsigned long sym_val;
+
+ if (0) sym_val=(unsigned long)do_resolve; /* TRICK: no warning */
+
+ /* modify GOT for REAL symbol */
+ sym_val=(unsigned long)_dl_sym(dh,sym);
+ *((unsigned long*)(dh->mem_base+tmp->r_offset))=sym_val;
+
+ /* JUMP (arg sysdep...) */
+ if (sym_val) return sym_val;
+ /* can't find symbol */
+ return (unsigned long)_DIE_;
+}
+
+/* library loader */
+
+/* ELF -> MMAP permissions */
+static inline int map_flags(int flags) {
+ int perm = 0;
+ if (flags & PF_X) perm|=PROT_EXEC;
+ if (flags & PF_R) perm|=PROT_READ;
+ if (flags & PF_W) perm|=PROT_WRITE;
+ return perm;
+}
+
+/* a simple mmap wrapper */
+static inline void*do_map_in(void*base,unsigned long length,int flags,int fd,unsigned long offset) {
+ register int op = MAP_PRIVATE;
+ if (base) op|=MAP_FIXED;
+ return _dl_sys_mmap(base, length, map_flags(flags), op, fd, offset);
+}
+
+/* map a library into memory */
+#define _ELF_DWN_ROUND(ps,n) ((n)&(~((ps)-1)))
+#define _ELF_UP_ROUND(ps,n) ((((n)&((ps)-1))?(ps):0)+_ELF_DWN_ROUND((ps),(n)))
+#define _ELF_RST_ROUND(ps,n) ((n)&((ps)-1))
+static struct _dl_handle*_dl_map_lib(const char*fn,const char*pathname,int fd,int flags) {
+ struct _dl_handle*ret=0;
+ int i;
+ unsigned char buf[1024];
+ char *m=0,*d=0;
+
+ unsigned long l;
+ struct stat st;
+
+ Elf_Ehdr*eeh;
+ Elf_Phdr*eph;
+
+ int ld_nr=0;
+ Elf_Phdr*ld[4]={0,0,0,0};
+ Elf_Phdr*dyn=0;
+
+ if (0) { pathname=0; } /* no unused parameter */
+ if (fd==-1) return 0;
+
+ if (_dl_sys_fstat(fd,&st)<0) {
+err_out_close:
+ _dl_sys_close(fd);
+ _dl_error_data=fn;
+ _dl_error=2;
+ return 0;
+ } else {
+ /* use st_dev and st_ino for identification */
+ }
+
+ if (_dl_sys_read(fd,buf,1024)<128) goto err_out_close;
+
+ eeh=(Elf_Ehdr*)buf;
+ eph=(Elf_Phdr*)&buf[eeh->e_phoff];
+
+ for (i=0;i<eeh->e_phnum;++i) {
+ if (eph[i].p_type==PT_LOAD) {
+ if (ld_nr>3) goto err_out_close;
+ ld[ld_nr++]=eph+i;
+ }
+ if (eph[i].p_type==PT_DYNAMIC) {
+ dyn=eph+i;
+ }
+ }
+
+ if (ld_nr==1) {
+ unsigned long offset=_ELF_DWN_ROUND(at_pagesize,ld[0]->p_offset);
+ unsigned long off =_ELF_RST_ROUND(at_pagesize,ld[0]->p_offset);
+ unsigned long length=_ELF_UP_ROUND(at_pagesize,ld[0]->p_memsz+off);
+ ret=_dl_get_handle();
+ m=(char*)do_map_in(0,length,ld[0]->p_flags,fd,offset);
+ if (m==MAP_FAILED) goto err_out_free;
+ /* zero pad bss */
+ l=ld[0]->p_offset+ld[0]->p_filesz;
+ memset(m+l,0,length-l);
+
+ ret->mem_base=m;
+ ret->mem_size=length;
+ }
+ else if (ld_nr==2) { /* aem... yes Quick & Really Dirty / for the avarage 99% */
+// unsigned long text_addr = _ELF_DWN_ROUND(at_pagesize,ld[0]->p_vaddr); /* do we need this ? */
+ unsigned long text_offset=_ELF_DWN_ROUND(at_pagesize,ld[0]->p_offset);
+ unsigned long text_off =_ELF_RST_ROUND(at_pagesize,ld[0]->p_offset);
+ unsigned long text_size =_ELF_UP_ROUND(at_pagesize,ld[0]->p_memsz+text_off);
+
+ unsigned long data_addr =_ELF_DWN_ROUND(at_pagesize,ld[1]->p_vaddr);
+ unsigned long data_offset=_ELF_DWN_ROUND(at_pagesize,ld[1]->p_offset);
+ unsigned long data_off =_ELF_RST_ROUND(at_pagesize,ld[1]->p_offset);
+ unsigned long data_size =_ELF_UP_ROUND(at_pagesize,ld[1]->p_memsz+data_off);
+ unsigned long data_fsize =_ELF_UP_ROUND(at_pagesize,ld[1]->p_filesz+data_off);
+
+ ret=_dl_get_handle();
+ /* mmap all mem_blocks for *.so */
+ m=(char*)do_map_in(0,text_size+data_size,ld[0]->p_flags,fd,text_offset);
+ if (m==MAP_FAILED) {
+err_out_free:
+ _dl_free_handle(ret);
+ _dl_sys_close(fd);
+ return 0;
+ }
+
+ /* release data,bss part */
+ _dl_sys_mprotect(m+data_addr,data_size,PROT_NONE);
+
+ /* mmap data,bss part */
+ d=(char*)do_map_in(m+data_addr,data_fsize,ld[1]->p_flags,fd,data_offset);
+
+ /* zero pad bss */
+ l=data_off+ld[1]->p_filesz;
+ memset(d+l,0,data_fsize-l);
+ /* more bss ? */
+ if (data_size>data_fsize) {
+ l=data_size-data_fsize;
+ _dl_sys_mmap(d+data_fsize,l,PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS,-1,0);
+ }
+
+ ret->mem_base=m;
+ ret->mem_size=text_size+data_size;
+ }
+ else {
+ _dl_error_data=fn;
+ _dl_error=7;
+ }
+
+ if (ret) {
+ ++ret->lnk_count;
+ if (flags&RTLD_USER)
+ ret->name=strdup(fn);
+ else
+ ret->name=_dl_lib_strdup(fn);
+ ret->flags=flags;
+ ret->dynamic=(Elf_Dyn*)(m+dyn->p_vaddr);
+ }
+
+ _dl_sys_close(fd);
+ return ret;
+}
+
+/* dynamic section parser */
+static struct _dl_handle* _dl_dyn_scan(struct _dl_handle*dh,Elf_Dyn*_dynamic) {
+ void(*init)(void)=0;
+
+ _dl_rel_t* plt_rel=0;
+ unsigned long plt_relsz=0;
+
+ _dl_rel_t* rel=0;
+ unsigned long relent=0;
+ unsigned long relsize=0;
+
+ int i;
+
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": pre dynamic scan "); ph((unsigned long)dh); pf("\n");
+#endif
+ for(i=0;_dynamic[i].d_tag;++i) {
+ switch(_dynamic[i].d_tag) {
+ /* this depends on dyn_str_tab -> second run */
+ case DT_NEEDED:
+ case DT_SONAME:
+ break;
+
+ /* BASIC DYNAMIC STUFF */
+ case DT_HASH:
+ dh->hash_tab = (unsigned long*)(dh->mem_base+_dynamic[i].d_un.d_ptr);
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": have hash @ "); ph((long)dh->hash_tab); pf("\n");
+#endif
+ break;
+ case DT_SYMTAB:
+ dh->dyn_sym_tab = (Elf_Sym*)(dh->mem_base+_dynamic[i].d_un.d_ptr);
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": have dyn_sym_tab @ "); ph((long)dh->dyn_sym_tab); pf("\n");
+#endif
+ break;
+ case DT_STRTAB:
+ dh->dyn_str_tab = (char*)(dh->mem_base+_dynamic[i].d_un.d_ptr);
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": have dyn_str_tab @ "); ph((long)dh->dyn_str_tab); pf("\n");
+#endif
+ break;
+
+ /* DYNAMIC INIT/FINI (constructors/destructors) */
+ case DT_FINI:
+ dh->fini = (void(*)(void))(dh->mem_base+_dynamic[i].d_un.d_val);
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": have fini @ "); ph((long)dh->fini); pf("\n");
+#endif
+ break;
+ case DT_INIT:
+ init = (void(*)(void))(dh->mem_base+_dynamic[i].d_un.d_val);
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": have init @ "); ph((long)init); pf("\n");
+#endif
+ break;
+
+ /* PLT RELOCATION */
+ case DT_PLTGOT:
+ dh->pltgot = (unsigned long*)(dh->mem_base+_dynamic[i].d_un.d_val);
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": have plt/got @ "); ph((long)dh->pltgot); pf("\n");
+#endif
+ break;
+ case DT_PLTREL:
+ if (_dynamic[i].d_un.d_val!=_DL_REL_T) {
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": have incompatible relocation type\n");
+#endif
+ _dl_error_data=dh->name;
+ _dl_error=6;
+ return 0;
+ }
+ break;
+ case DT_JMPREL:
+ plt_rel = (_dl_rel_t*)(dh->mem_base+_dynamic[i].d_un.d_val);
+ dh->plt_rel = plt_rel;
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": have jmprel @ "); ph((long)plt_rel); pf("\n");
+#endif
+ break;
+ case DT_PLTRELSZ:
+ plt_relsz = _dynamic[i].d_un.d_val;
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": have pltrelsize @ "); ph((long)plt_relsz); pf("\n");
+#endif
+ break;
+
+ /* BASIC RELOCATION */
+ case DT_REL:
+ rel = (_dl_rel_t*)(dh->mem_base+_dynamic[i].d_un.d_val);
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": have rel @ "); ph((long)rel); pf("\n");
+#endif
+ break;
+ case DT_RELENT:
+ relent=_dynamic[i].d_un.d_val;
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": have relent @ "); ph((long)relent); pf("\n");
+#endif
+ break;
+ case DT_RELSZ:
+ relsize=_dynamic[i].d_un.d_val;
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": have relsize @ "); ph((long)relsize); pf("\n");
+#endif
+ break;
+
+
+ /* TEXT RELOCATIONS POSSIBLE -> NO SHARED OBJECT */
+ case DT_TEXTREL:
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": found possible textrelocation -> "); pf(dh->name); pf(" is not compiled as a shared library\n");
+#endif
+ _dl_error_data=dh->name;
+ _dl_error=3;
+ return 0;
+ break;
+
+ /* OTHERS */
+ default:
+#ifdef DEBUG
+#if 0
+ pf(__FUNCTION__); pf(": unknown "); ph(_dynamic[i].d_tag); pf(", "); ph(_dynamic[i].d_un.d_val); pf("\n");
+#endif
+#endif
+ break;
+ }
+ }
+
+ for(i=0;_dynamic[i].d_tag;i++) {
+ if (dh->name) { /* librabry can have a SONAME */
+ if (_dynamic[i].d_tag==DT_SONAME) {
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": pre soname: "); pf(dh->name); pf("\n");
+#endif
+ if (dh->flags&RTLD_USER) free(dh->name);
+ dh->flags&=~RTLD_NOSONAME;
+ dh->name = dh->dyn_str_tab+_dynamic[i].d_un.d_val;
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": have soname: "); pf(dh->name); pf("\n");
+#endif
+ }
+ }
+ else { /* programs can have a LD_RUN_PATH */
+ if (_dynamic[i].d_tag==DT_RPATH) {
+ register char *rpath=dh->dyn_str_tab+_dynamic[i].d_un.d_val;
+ _dl_search_rpath=rpath;
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": have runpath: "); pf(rpath); pf("\n");
+#endif
+ }
+ }
+ }
+
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": post dynamic scan "); ph((unsigned long)dh); pf("\n");
+#endif
+
+ if (work_on_pltgot(dh)) {
+ _dl_error_data=dh->name;
+ _dl_error=3;
+ return 0;
+ }
+
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": pre load depending libraries "); ph((unsigned long)dh); pf("\n");
+#endif
+ /* load depending libs */
+ for(i=0;_dynamic[i].d_tag;++i) {
+ if (_dynamic[i].d_tag==DT_NEEDED) {
+ char *lib_name=dh->dyn_str_tab+_dynamic[i].d_un.d_val;
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": needed for this lib: "); pf(lib_name); pf("\n");
+#endif
+ _dl_queue_lib(lib_name,dh->flags);
+ }
+ }
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": pre open depending libraries 2 "); ph((unsigned long)dh); pf("\n");
+#endif
+ if (_dl_open_dep()) {
+ return 0;
+ }
+
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": post load depending libraries, pre resolve "); ph((unsigned long)dh); pf("\n");
+#endif
+
+ /* relocation */
+ if (rel) {
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": try to relocate some values\n");
+#endif
+ if (_dl_relocate(dh,rel,relsize/relent)) return 0;
+ }
+
+ /* do PTL / GOT relocation */
+ if (plt_rel) {
+ _dl_rel_t *tmp,*max=((void*)plt_rel)+plt_relsz;
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": rel plt/got\n");
+#endif
+ for(tmp=plt_rel;tmp<max;(char*)tmp=((char*)tmp)+sizeof(_dl_rel_t)) {
+ if ((dh->flags&RTLD_NOW)) {
+ unsigned long sym=(unsigned long)_dl_sym(dh,ELF_R_SYM(tmp->r_info));
+ if (sym) *((unsigned long*)(dh->mem_base+tmp->r_offset))=sym;
+ else {
+ _dl_error_data=dh->name;
+ _dl_error=4;
+ return 0;
+ }
+ }
+ else
+ _DL_REL_PLT(dh->mem_base,tmp);
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": rel @ "); ph((long)dh->mem_base+tmp->r_offset); pf(" with type ");
+ ph(ELF_R_TYPE(tmp->r_info)); pf(" and sym "); ph(ELF_R_SYM(tmp->r_info));
+ pf(" -> "); ph(*((unsigned long*)(dh->mem_base+tmp->r_offset))); pf("\n");
+#endif
+ }
+ }
+
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": post resolve, pre init "); ph((unsigned long)dh); pf("\n");
+#endif
+ if (init) init();
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": post init "); ph((unsigned long)dh); pf("\n");
+#endif
+
+ return dh;
+}
+
+static void*_dl_load(const char*fn,const char*pathname,int fd,int flags) {
+ struct _dl_handle*ret=0;
+ if ((ret=_dl_map_lib(fn,pathname,fd,flags))) {
+ ret=_dl_dyn_scan(ret,ret->dynamic);
+ }
+ return ret;
+}
+
+
+/* ELF AUX parser */
+static void _dl_elfaux(register unsigned long*ui) {
+ register struct elf_aux {
+ unsigned long type;
+ unsigned long val;
+ } *ea;
+
+ while (*ui) ++ui;
+ /* now *ui points to the tailing NULL-pointer of the envirioment */
+
+ /* walk the elf_aux table */
+ for (ea=(struct elf_aux*)(ui+1); ea->type; ++ea) {
+ switch (ea->type) {
+ case AT_EXECFD: /* 2 */
+ /* DIE! DIE! DIE! */
+ pf("kernel gives us an unsupported binary load type...\n");
+ _dl_sys_exit(42);
+ break;
+
+ case AT_PHDR: /* 3 */
+ prog_ph=(Elf_Phdr*)ea->val;
+#ifdef DEBUG
+ pf("program header @ "); ph(ea->val); pf("\n");
+#endif
+ break;
+ case AT_PHENT: /* 4 */
+ prog_ph_size=ea->val;
+#ifdef DEBUG
+ pf("program header size "); ph(ea->val); pf("\n");
+#endif
+ break;
+ case AT_PHNUM: /* 5 */
+ prog_ph_num=ea->val;
+#ifdef DEBUG
+ pf("program header # "); ph(ea->val); pf("\n");
+#endif
+ break;
+
+ case AT_PAGESZ: /* 6 */
+ at_pagesize=ea->val;
+#ifdef DEBUG
+ pf("page size "); ph(ea->val); pf("\n");
+#endif
+ break;
+
+ case AT_BASE: /* 7 */
+ loadaddr=ea->val;
+#ifdef DEBUG
+ pf("interpreter base: "); ph(ea->val); pf("\n");
+#endif
+ break;
+
+#if 0
+ case AT_FLAGS: /* 8 */
+#ifdef DEBUG
+ pf("flags "); ph(ea->val); pf("\n");
+#endif
+ break;
+#endif
+
+ case AT_ENTRY: /* 9 */
+ prog_entry=ea->val;
+#ifdef DEBUG
+ pf("start program @ "); ph(ea->val); pf("\n");
+#endif
+ break;
+
+ case AT_NOTELF: /* 10 */
+ pf("this is an ELF-loader... and therefor can't handle anything else.\n");
+ _dl_sys_exit(42);
+ break;
+
+ case AT_UID: /* 11 */
+ at_uid=ea->val;
+#ifdef DEBUG
+ pf(" UID: "); ph(ea->val); pf("\n");
+#endif
+ break;
+ case AT_EUID: /* 12 */
+ at_euid=ea->val;
+#ifdef DEBUG
+ pf("EUID: "); ph(ea->val); pf("\n");
+#endif
+ break;
+ case AT_GID: /* 13 */
+ at_gid=ea->val;
+#ifdef DEBUG
+ pf(" GID: "); ph(ea->val); pf("\n");
+#endif
+ break;
+ case AT_EGID: /* 14 */
+ at_egid=ea->val;
+#ifdef DEBUG
+ pf("EGID: "); ph(ea->val); pf("\n");
+#endif
+ break;
+
+#if 0
+ case AT_PLATFORM: /* 15 */
+#ifdef DEBUG
+ pf("CPU: "); ph(ea->val); pf("\n");
+#endif
+ break;
+ case AT_HWCAP: /* 16 */
+#ifdef DEBUG
+ pf("CPU capabilities: "); ph(ea->val); pf("\n");
+#endif
+ break;
+ case AT_CLKTCK: /* 17 */
+#ifdef DEBUG
+ pf("CLK per sec "); ph( ea->val); pf("\n");
+#endif
+ break;
+ case AT_FPUCW: /* 18 */
+#ifdef DEBUG
+ pf("FPU control word "); ph( ea->val); pf("\n");
+#endif
+ break;
+#endif
+
+ default:
+ break;
+ }
+ }
+}
+
+
+/* start of libdl dynamic linker */
+static unsigned long _dl_main(int argc,char*argv[],char*envp[],unsigned long _dynamic) {
+ unsigned long*got;
+ struct _dl_handle*prog,*mydh;
+ struct _dl_handle my_dh;
+ Elf_Dyn*prog_dynamic=0;
+ unsigned int i;
+
+ if (0) _dl_main(argc,argv,envp,_dynamic); /* TRICK: no warning */
+
+ /* prepare to bootstarp the relocations */
+ got=get_got();
+ _dl_environ=envp;
+
+ /* run elf_aux (kernel provided misc data) */
+ _dl_elfaux((unsigned long*)envp);
+
+ if (loadaddr==0) {
+ pf("\ndiet libdl.so/dynamic-linker can't be started as a program !\n\n SORRY...\n\n");
+ return (unsigned long)_DIE_;
+ }
+
+ memset(&my_dh,0,sizeof(my_dh));
+ my_dh.mem_base=(char*)loadaddr;
+ my_dh.mem_size=0;
+ my_dh.lnk_count=1024;
+ my_dh.name="libdl.so";
+ my_dh.flags=LDSO_FLAGS;
+
+ got[1]=0; /* NOT YET (my_dh) */
+ got[2]=(unsigned long)_DIE_; /* NO lazy symbol resolver as long as we are not ready */
+
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": pre scan\n");
+#endif
+ /* bootstrap relocation */
+ if (_dl_dyn_scan(&my_dh,(Elf_Dyn*)_dynamic)==0) {
+ pf("error with dyn_scan myself\n");
+ return (unsigned long)_DIE_;
+ }
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": post scan\n");
+#endif
+
+ /* now we are save to use anything :) (hopefully) */
+
+ fini_entry=tt_fini;
+
+ prog=_dl_get_handle();
+
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": ugly, ugly, COPY pregenerated handle to real handle\n");
+#endif
+ mydh=_dl_get_handle();
+ {
+ register struct _dl_handle*tmp=mydh->prev;
+ memcpy(mydh,&my_dh,sizeof(struct _dl_handle));
+ mydh->prev=tmp;
+ }
+ got[1]=(unsigned long)mydh;
+
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": MORE ugly: prepare program...\n");
+#endif
+ for(i=0;(i<prog_ph_num);++i) {
+ if (prog_ph[i].p_type==PT_DYNAMIC) {
+ prog_dynamic=(Elf_Dyn*)prog_ph[i].p_vaddr;
+ break;
+ }
+ }
+ if (prog_dynamic==0) {
+ ph(0xe0000001);
+ pf(" error with program: no dynamic section ?\n");
+ return (unsigned long)_DIE_;
+ }
+ prog->name=0;
+ prog->lnk_count=1024;
+ prog->dynamic=prog_dynamic;
+ prog->flags=LDSO_FLAGS;
+
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": dyn_scan program...\n");
+#endif
+ if (_dl_dyn_scan(prog,(Elf_Dyn*)prog_dynamic)==0) {
+ _dl_error_location="error in dyn_scan the program";
+ pf(dlerror()); pf("\n");
+ return (unsigned long)_DIE_;
+ }
+
+ /* now start the program */
+#ifdef DEBUG
+ pf(__FUNCTION__); pf(": now jump to program entrypoint\n");
+#endif
+ return prog_entry;
+}
+
+#endif
generated by cgit v1.2.1 (git 2.21.0) at 2024-05-06 10:11:26 +0000