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/*
* Copyright (C) 2016 Andes Technology, Inc.
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
/* Need bootstrap relocations */
#define ARCH_NEEDS_BOOTSTRAP_RELOCS
__asm__("\
.text\n\
.globl _start\n\
.globl _dl_start\n\
.globl _dl_start_user\n\
.type _start,#function\n\
.type _dl_start,#function\n\
.type _dl_start_user,#function\n\
.align 4\n\
.pic\n\
_start:\n\
! we are PIC code, so get global offset table\n\
mfusr $r15, $PC \n\
sethi $gp, HI20(_GLOBAL_OFFSET_TABLE_ + 4)\n\
ori $gp, $gp, LO12(_GLOBAL_OFFSET_TABLE_ + 8)\n\
add $gp, $r15, $gp\n\
\n\
! at start time, all the args are on the stack\n\
addi $r0, $sp, 0\n\
! adjust stack\n\
!addi $sp, $sp, -24\n\
bal _dl_start@PLT\n\
! save user entry point in r6\n\
addi $r6, $r0, 0\n\
! adjust sp and reload registers\n\
!addi $sp, $sp, 24\n\
\n\
_dl_start_user:\n\
! See if we were run as a command with the executable file\n\
! name as an extra leading argument.\n\
! skip these arguments\n\
l.w $r2, _dl_skip_args@GOTOFF ! args to skip\n\
lwi $r0, [$sp+0] ! original argc\n\
slli $r1, $r2, 2 ! offset for new sp\n\
add $sp, $sp, $r1 ! adjust sp to skip args\n\
sub $r0, $r0, $r2 ! set new argc\n\
swi $r0, [$sp+0] ! save new argc\n\
\n\
! load address of _dl_fini finalizer function\n\
la $r5, _dl_fini@GOTOFF\n\
! jump to the user_s entry point\n\
jr $r6\n\
.size _dl_start_user, . - _dl_start_user\n\
.previous\n\
");
#define COPY_UNALIGNED_WORD(swp, twp) \
{ \
__typeof (swp) __tmp = __builtin_nds32_unaligned_load_w ((unsigned int*)&swp); \
__builtin_nds32_unaligned_store_w ((unsigned int *)twp, __tmp); \
}
/* 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)+1)
/* Handle relocation of the symbols in the dynamic loader. */
static __always_inline
void PERFORM_BOOTSTRAP_RELOC(ELF_RELOC *rpnt, unsigned long *reloc_addr,
unsigned long symbol_addr, unsigned long load_addr, Elf32_Sym *symtab)
{
Elf32_Addr value;
switch (ELF32_R_TYPE(rpnt->r_info)) {
case R_NDS32_NONE:
break;
case R_NDS32_32:
case R_NDS32_GLOB_DAT:
case R_NDS32_JMP_SLOT:
*reloc_addr = symbol_addr + rpnt->r_addend;
break;
case R_NDS32_32_RELA:
value = symbol_addr + rpnt->r_addend;
COPY_UNALIGNED_WORD (value, reloc_addr);
break;
#undef COPY_UNALIGNED_WORD
case R_NDS32_RELATIVE:
*reloc_addr = load_addr + rpnt->r_addend;
break;
default:
SEND_STDERR("Unsupported relocation type\n");
_dl_exit(1);
}
}
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