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[/] [or1k/] [trunk/] [linux/] [uClibc/] [ldso/] [ldso/] [arm/] [ld_sysdep.h] - Rev 1765
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/* * Various assmbly language/system dependent hacks that are required * so that we can minimize the amount of platform specific code. */ /* * Define this if the system uses RELOCA. */ #undef ELF_USES_RELOCA /* * Get a pointer to the argv array. On many platforms this can be just * the address if the first argument, on other platforms we need to * do something a little more subtle here. */ #define GET_ARGV(ARGVP, ARGS) ARGVP = ((unsigned long*) ARGS) /* * Initialization sequence for a GOT. */ #define INIT_GOT(GOT_BASE,MODULE) \ { \ GOT_BASE[2] = (unsigned long) _dl_linux_resolve; \ GOT_BASE[1] = (unsigned long) MODULE; \ } /* * Here is a macro to perform a relocation. This is only used when * bootstrapping the dynamic loader. RELP is the relocation that we * are performing, REL is the pointer to the address we are relocating. * SYMBOL is the symbol involved in the relocation, and LOAD is the * load address. */ #define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD,SYMTAB) \ switch(ELF32_R_TYPE((RELP)->r_info)){ \ case R_ARM_ABS32: \ *REL += SYMBOL; \ break; \ case R_ARM_PC24: \ { long newvalue, topbits; \ unsigned long addend = *REL & 0x00ffffff; \ if (addend & 0x00800000) addend |= 0xff000000; \ newvalue=SYMBOL-(unsigned long)REL+(addend<<2); \ topbits = newvalue & 0xfe000000; \ if (topbits!=0xfe000000&&topbits!=0x00000000){ \ newvalue = fix_bad_pc24(REL, SYMBOL) \ -(unsigned long)REL+(addend<<2); \ topbits = newvalue & 0xfe000000; \ if (topbits!=0xfe000000&&topbits!=0x00000000){ \ SEND_STDERR("R_ARM_PC24 relocation out of range\n");\ _dl_exit(1); } } \ newvalue>>=2; \ SYMBOL=(*REL&0xff000000)|(newvalue & 0x00ffffff); \ *REL=SYMBOL; \ } \ break; \ case R_ARM_GLOB_DAT: \ case R_ARM_JUMP_SLOT: \ *REL = SYMBOL; \ break; \ case R_ARM_RELATIVE: \ *REL += (unsigned long) LOAD; \ break; \ case R_ARM_NONE: \ break; \ default: \ SEND_STDERR("Aiieeee!"); \ _dl_exit(1); \ } /* * Transfer control to the user's application, once the dynamic loader * is done. This routine has to exit the current function, then * call the _dl_elf_main function. */ #define START() return _dl_elf_main; /* Here we define the magic numbers that this dynamic loader should accept */ #define MAGIC1 EM_ARM #undef MAGIC2 /* Used for error messages */ #define ELF_TARGET "ARM" struct elf_resolve; unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry); static inline unsigned long arm_modulus(unsigned long m, unsigned long p) { unsigned long i,t,inc; i=p; t=0; while(!(i&(1<<31))) { i<<=1; t++; } t--; for(inc=t;inc>2;inc--) { i=p<<inc; if(i&(1<<31)) break; while(m>=i) { m-=i; i<<=1; if(i&(1<<31)) break; if(i<p) break; } } while(m>=p) { m-=p; } return m; } #define do_rem(result, n, base) result=arm_modulus(n,base); /* 4096 bytes alignment */ #define PAGE_ALIGN 0xfffff000 #define ADDR_ALIGN 0xfff #define OFFS_ALIGN 0x7ffff000