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/*
* Architecture specific code used by dl-startup.c
* Copyright (C) 2019 Waldemar Brodkorb <wbx@uclibc-ng.org>
* Ported from GNU libc
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
/* Copyright (C) 2011-2019 Free Software Foundation, Inc.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <features.h>
#include <sys/asm.h>
#ifndef _RTLD_PROLOGUE
# define _RTLD_PROLOGUE(entry) \
".globl\t" __STRING (entry) "\n\t" \
".type\t" __STRING (entry) ", @function\n" \
__STRING (entry) ":\n\t"
#endif
#ifndef _RTLD_EPILOGUE
# define _RTLD_EPILOGUE(entry) \
".size\t" __STRING (entry) ", . - " __STRING (entry) "\n\t"
#endif
#define STRINGXP(X) __STRING (X)
__asm__(\
".text\n\
" _RTLD_PROLOGUE (_start) "\
mv a0, sp\n\
jal _dl_start\n\
# Stash user entry point in s0.\n\
mv s0, a0\n\
# See if we were run as a command with the executable file\n\
# name as an extra leading argument.\n\
lw a0, _dl_skip_args\n\
# Load the original argument count.\n\
" STRINGXP (REG_L) " a1, 0(sp)\n\
# Subtract _dl_skip_args from it.\n\
sub a1, a1, a0\n\
# Adjust the stack pointer to skip _dl_skip_args words.\n\
sll a0, a0, " STRINGXP (PTRLOG) "\n\
add sp, sp, a0\n\
# Save back the modified argument count.\n\
" STRINGXP (REG_S) " a1, 0(sp)\n\
# Pass our finalizer function to _start.\n\
lla a0, _dl_fini\n\
# Jump to the user entry point.\n\
jr s0\n\
" _RTLD_EPILOGUE (_start) "\
.previous" \
);
/* Get a pointer to the argv array. On many platforms this can be just
* the address of 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)
/* Function calls are not safe until the GOT relocations have been done. */
#define NO_FUNCS_BEFORE_BOOTSTRAP
/* Handle relocation of the symbols in the dynamic loader. */
static __always_inline
void PERFORM_BOOTSTRAP_RELOC(ELF_RELOC *rpnt, ElfW(Addr) *reloc_addr,
ElfW(Addr) symbol_addr, ElfW(Addr) load_addr, ElfW(Addr) *sym)
{
switch (ELF_R_TYPE(rpnt->r_info)) {
case R_RISCV_NONE:
break;
case R_RISCV_JUMP_SLOT:
*reloc_addr = symbol_addr + rpnt->r_addend;
break;
default:
_dl_exit(1);
}
}
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