/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup
*
* @brief
*/
/*
* Copyright (C) 2014 Chris Johns <chrisj@rtems.org>.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <rtems/rtl/rtl.h>
#include "rtl-elf.h"
#include "rtl-error.h"
#include <rtems/rtl/rtl-trace.h>
#include "rtl-unwind.h"
#include "rtl-unwind-dw2.h"
uint32_t
rtems_rtl_elf_section_flags (const rtems_rtl_obj* obj,
const Elf_Shdr* shdr)
{
return 0;
}
uint32_t
rtems_rtl_elf_arch_parse_section (const rtems_rtl_obj* obj,
int section,
const char* name,
const Elf_Shdr* shdr,
const uint32_t flags)
{
(void) obj;
(void) section;
(void) name;
(void) shdr;
return flags;
}
bool
rtems_rtl_elf_arch_section_alloc (const rtems_rtl_obj* obj,
rtems_rtl_obj_sect* sect)
{
(void) obj;
(void) sect;
return false;
}
bool
rtems_rtl_elf_arch_section_free (const rtems_rtl_obj* obj,
rtems_rtl_obj_sect* sect)
{
(void) obj;
(void) sect;
return false;
}
bool
rtems_rtl_elf_rel_resolve_sym (Elf_Word type)
{
return true;
}
uint32_t rtems_rtl_obj_tramp_alignment (const rtems_rtl_obj* obj)
{
(void) obj;
return sizeof(uint32_t);
}
size_t
rtems_rtl_elf_relocate_tramp_max_size (void)
{
/*
* Disable by returning 0.
*/
return 0;
}
rtems_rtl_elf_rel_status
rtems_rtl_elf_relocate_rela_tramp (rtems_rtl_obj* obj,
const Elf_Rela* rela,
const rtems_rtl_obj_sect* sect,
const char* symname,
const Elf_Byte syminfo,
const Elf_Word symvalue)
{
(void) obj;
(void) rela;
(void) sect;
(void) symname;
(void) syminfo;
(void) symvalue;
rtems_rtl_set_error (EINVAL, "rela type record not supported");
return rtems_rtl_elf_rel_failure;
}
rtems_rtl_elf_rel_status
rtems_rtl_elf_relocate_rela (rtems_rtl_obj* obj,
const Elf_Rela* rela,
const rtems_rtl_obj_sect* sect,
const char* symname,
const Elf_Byte syminfo,
const Elf_Word symvalue)
{
(void) obj;
(void) rela;
(void) sect;
(void) symname;
(void) syminfo;
(void) symvalue;
rtems_rtl_set_error (EINVAL, "rela type record not supported");
return rtems_rtl_elf_rel_failure;
}
rtems_rtl_elf_rel_status
rtems_rtl_elf_relocate_rel_tramp (rtems_rtl_obj* obj,
const Elf_Rel* rel,
const rtems_rtl_obj_sect* sect,
const char* symname,
const Elf_Byte syminfo,
const Elf_Word symvalue)
{
(void) obj;
(void) rel;
(void) sect;
(void) symname;
(void) syminfo;
(void) symvalue;
return rtems_rtl_elf_rel_no_error;
}
#define RTEMS_RTL_MIPS_HI16_MAX (128)
static struct {
Elf_Addr* where_hi16;
Elf_Addr ahl;
} mips_hi16_list[RTEMS_RTL_MIPS_HI16_MAX];
static size_t mips_hi16_list_cnt;
/*
* 1. _gp_disp symbol are not considered in this file.
* 2. There is a local/external column;
* local corresponds to (STB_LOCAL & STT_SECTION) and
* all others are external. Because if the type of a
* symbol is STT_SECTION, it must be STB_LOCAL. Thus
* just consider symtype here.
*/
rtems_rtl_elf_rel_status
rtems_rtl_elf_relocate_rel (rtems_rtl_obj* obj,
const Elf_Rel* rel,
const rtems_rtl_obj_sect* sect,
const char* symname,
const Elf_Byte syminfo,
const Elf_Word symvalue)
{
Elf_Addr *where;
Elf_Word tmp;
Elf_Word addend = (Elf_Word)0;
Elf_Word local = 0;
Elf_Addr *where_hi16;
Elf_Addr ahl;
uint32_t t;
where = (Elf_Addr *)(sect->base + rel->r_offset);
addend = *where;
if (syminfo == STT_SECTION)
local = 1;
switch (ELF_R_TYPE(rel->r_info)) {
case R_TYPE(NONE):
break;
case R_TYPE(16):
tmp = addend & 0xffff;
if ((tmp & 0x8000) == 0x8000)
tmp |= 0xffff0000; /* Sign extend */
tmp = symvalue + (int)tmp;
if ((tmp & 0xffff0000) != 0) {
printf("R_MIPS_16 Overflow\n");
return rtems_rtl_elf_rel_failure;
}
*where = (tmp & 0xffff) | (*where & 0xffff0000);
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: R_MIPS_16 %p @ %p in %s\n",
(void *)*(where), where, rtems_rtl_obj_oname (obj));
break;
case R_TYPE(32):
tmp = symvalue + addend;
if (addend != tmp)
*where = tmp;
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: R_MIPS_32 %p @ %p in %s\n",
(void *)*(where), where, rtems_rtl_obj_oname (obj));
break;
case R_TYPE(26):
addend &= 0x03ffffff;
addend <<= 2;
if (local == 1) { /* STB_LOCAL and STT_SECTION */
tmp = symvalue + (((Elf_Addr)where & 0xf0000000) | addend);
tmp >>= 2;
} else { /* external */
tmp = addend;
if ((tmp & 0x08000000) == 0x08000000)
tmp |= 0xf0000000; /* Sign extened */
tmp = ((int)tmp + symvalue) >> 2;
}
*where &= ~0x03ffffff;
*where |= tmp & 0x03ffffff;
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: R_MIPS_26 local=%" PRIu32 " @ %p in %s\n",
local, (void *)*(where), rtems_rtl_obj_oname (obj));
break;
case R_TYPE(HI16):
if (mips_hi16_list_cnt >= RTEMS_RTL_MIPS_HI16_MAX) {
rtems_rtl_set_error (ENOMEM,
"%s: too many MIPS_HI16 relocs", sect->name);
return false;
}
mips_hi16_list[mips_hi16_list_cnt].where_hi16 = where;
mips_hi16_list[mips_hi16_list_cnt].ahl = addend << 16;
++mips_hi16_list_cnt;
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: R_MIPS_HI16 %p @ %p in %s\n",
(void *)*(where), where, rtems_rtl_obj_oname (obj));
break;
case R_TYPE(LO16):
t = (int16_t) addend;
tmp = symvalue;
if (tmp == 0) {
rtems_rtl_set_error (EINVAL,
"%s: symvalue is 0 in MIPS_LO16", sect->name);
return rtems_rtl_elf_rel_failure;
}
/* reloc low part */
addend &= 0xffff0000;
addend |= (uint16_t)(t + tmp);
*where = addend;
if (rtems_rtl_trace(RTEMS_RTL_TRACE_RELOC))
printf("*where %x where %p\n", *where, where);
/* reloc hi parts */
while (mips_hi16_list_cnt != 0) {
--mips_hi16_list_cnt;
ahl = mips_hi16_list[mips_hi16_list_cnt].ahl;
where_hi16 = mips_hi16_list[mips_hi16_list_cnt].where_hi16;
addend = *(where_hi16);
addend &= 0xffff0000;
addend |= ((ahl + t + tmp) - (int16_t) (ahl + t + tmp)) >> 16;
*(where_hi16) = addend;
if (rtems_rtl_trace(RTEMS_RTL_TRACE_RELOC))
printf("*where_hi %x where_hi %p ahl=%08x\n",
*(where_hi16), where_hi16, ahl);
}
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: R_MIPS_LO16 %p @ %p in %s\n",
(void *)*(where), where, rtems_rtl_obj_oname (obj));
break;
case R_TYPE(PC16):
tmp = addend & 0xffff;
if ((tmp & 0x8000) == 0x8000)
tmp |= 0xffff0000; /* Sign extend */
tmp = symvalue + ((int)tmp*4) - (Elf_Addr)where;
tmp = (Elf_Sword)tmp >> 2;
if (((Elf_Sword)tmp > 0x7fff) || ((Elf_Sword)tmp < -0x8000)) {
printf("R_MIPS_PC16 Overflow\n");
return rtems_rtl_elf_rel_failure;
}
*where = (tmp & 0xffff) | (*where & 0xffff0000);
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: R_MIPS_PC16 %p @ %p in %s\n",
(void *)*(where), where, rtems_rtl_obj_oname (obj));
break;
default:
printf ("rtl: reloc unknown: sym = %" PRIu32 ", type = %" PRIu32 ", offset = %p, "
"contents = %p\n",
ELF_R_SYM(rel->r_info), (uint32_t) ELF_R_TYPE(rel->r_info),
(void *)rel->r_offset, (void *)*where);
rtems_rtl_set_error (EINVAL,
"%s: Unsupported relocation type %" PRIu32
"in non-PLT relocations",
sect->name, (uint32_t) ELF_R_TYPE(rel->r_info));
return rtems_rtl_elf_rel_failure;
}
return rtems_rtl_elf_rel_no_error;
}
bool
rtems_rtl_elf_unwind_parse (const rtems_rtl_obj* obj,
const char* name,
uint32_t flags)
{
return rtems_rtl_elf_unwind_dw2_parse (obj, name, flags);
}
bool
rtems_rtl_elf_unwind_register (rtems_rtl_obj* obj)
{
return rtems_rtl_elf_unwind_dw2_register (obj);
}
bool
rtems_rtl_elf_unwind_deregister (rtems_rtl_obj* obj)
{
return rtems_rtl_elf_unwind_dw2_deregister (obj);
}
