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/*
* Copyright (C) 2013 Imagination Technologies Ltd.
*
* Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
*/
/*
* This code fixes the stack pointer so that the dynamic linker
* can find argc, argv and auxvt (Auxillary Vector Table).
*/
__asm__ (
" .text\n"
" .global __start\n"
" .type __start,@function\n"
" .hidden __start\n"
"_start:\n"
"__start:\n"
" MSETL [A0StP++],D0Ar4,D0Ar2\n"
" MOV D1Ar1,D0Ar2\n"
" CALLR D1RtP,__dl_start\n"
" GETL D0Ar2,D1Ar1,[A0StP+#-(1*8)]\n"
" GETL D0Ar4,D1Ar3,[A0StP+#-(2*8)]\n"
" SUB A0StP,A0StP,#(2*8)\n"
" MOV PC,D0Re0\n"
" .size __start,.-__start\n"
" .previous\n"
);
/*
* 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))
/* Handle relocation of the symbols in the dynamic loader. */
static inline
void PERFORM_BOOTSTRAP_RELOC(ELF_RELOC *rpnt, unsigned long *reloc_addr,
unsigned long symbol_addr, unsigned long load_addr, Elf32_Sym *symtab)
{
switch (ELF32_R_TYPE(rpnt->r_info)) {
case R_METAG_GLOB_DAT:
case R_METAG_JMP_SLOT:
case R_METAG_ADDR32:
*reloc_addr = symbol_addr;
break;
case R_METAG_RELATIVE:
*reloc_addr = load_addr + rpnt->r_addend;
break;
case R_METAG_RELBRANCH:
*reloc_addr = symbol_addr + rpnt->r_addend - *reloc_addr - 4;
break;
case R_METAG_NONE:
break;
default:
_dl_exit(1);
break;
}
}
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