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/* KVX-specific support for ELF.
Copyright (C) 2009-2024 Free Software Foundation, Inc.
Contributed by Kalray SA.
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING3. If not,
see <http://www.gnu.org/licenses/>. */
#include "sysdep.h"
#include "elfxx-kvx.h"
#include <stdarg.h>
#include <string.h>
/* Return non-zero if the indicated VALUE has overflowed the maximum
range expressible by a unsigned number with the indicated number of
BITS. */
static bfd_reloc_status_type
kvx_unsigned_overflow (bfd_vma value, unsigned int bits)
{
bfd_vma lim;
if (bits >= sizeof (bfd_vma) * 8)
return bfd_reloc_ok;
lim = (bfd_vma) 1 << bits;
if (value >= lim)
return bfd_reloc_overflow;
return bfd_reloc_ok;
}
/* Return non-zero if the indicated VALUE has overflowed the maximum
range expressible by an signed number with the indicated number of
BITS. */
static bfd_reloc_status_type
kvx_signed_overflow (bfd_vma value, unsigned int bits)
{
bfd_vma lim;
if (bits >= sizeof (bfd_vma) * 8)
return bfd_reloc_ok;
lim = (bfd_vma) 1 << (bits - 1);
if (value + lim >= lim * 2)
return bfd_reloc_overflow;
return bfd_reloc_ok;
}
/* Insert the addend/value into the instruction or data object being
relocated. */
bfd_reloc_status_type
_bfd_kvx_elf_put_addend (bfd *abfd,
bfd_byte *address,
bfd_reloc_code_real_type r_type ATTRIBUTE_UNUSED,
reloc_howto_type *howto,
bfd_signed_vma addend)
{
bfd_reloc_status_type status = bfd_reloc_ok;
bfd_vma contents;
int size;
size = bfd_get_reloc_size (howto);
switch (size)
{
case 2:
contents = bfd_get_16 (abfd, address);
break;
case 4:
if (howto->src_mask != 0xffffffff)
/* Must be 32-bit instruction, always little-endian. */
contents = bfd_getl32 (address);
else
/* Must be 32-bit data (endianness dependent). */
contents = bfd_get_32 (abfd, address);
break;
case 8:
contents = bfd_get_64 (abfd, address);
break;
default:
abort ();
}
switch (howto->complain_on_overflow)
{
case complain_overflow_dont:
break;
case complain_overflow_signed:
status = kvx_signed_overflow (addend,
howto->bitsize + howto->rightshift);
break;
case complain_overflow_unsigned:
status = kvx_unsigned_overflow (addend,
howto->bitsize + howto->rightshift);
break;
case complain_overflow_bitfield:
default:
abort ();
}
addend >>= howto->rightshift;
/* FIXME KVX : AARCH64 is "redoing" what the link_relocate bfd
* function does ie. extract bitfields and apply then to the
* existing content (insn) (howto's job) Not sure exactly
* why. Maybe because we need this even when not applying reloc
* against a input_bfd (eg. when doing PLT). On KVX, we have not
* reached a point where we would need to write similar
* functions for each insn. So we'll simply enrich the default
* case for handling a bit more than "right aligned bitfields"
*
* Beware that this won't be able to apply generic howto !
*/
/* if (howto->dst_mask & (howto->dst_mask + 1)) */
/* return bfd_reloc_notsupported; */
addend <<= howto->bitpos;
contents = ((contents & ~howto->dst_mask) | (addend & howto->dst_mask));
switch (size)
{
case 2:
bfd_put_16 (abfd, contents, address);
break;
case 4:
if (howto->dst_mask != 0xffffffff)
/* must be 32-bit instruction, always little-endian */
bfd_putl32 (contents, address);
else
/* must be 32-bit data (endianness dependent) */
bfd_put_32 (abfd, contents, address);
break;
case 8:
bfd_put_64 (abfd, contents, address);
break;
default:
abort ();
}
return status;
}
bool
_bfd_kvx_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
{
int offset;
size_t size;
switch (note->descsz)
{
case 680: /* sizeof(struct elf_prstatus) on Linux/kvx. */
/* pr_cursig */
elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
/* pr_pid */
elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 32);
/* pr_reg */
offset = 112;
size = 560;
break;
default:
return false;
}
/* Make a ".reg/999" section. */
return _bfd_elfcore_make_pseudosection (abfd, ".reg", size,
note->descpos + offset);
}
bool
_bfd_kvx_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
{
switch (note->descsz)
{
case 136: /* This is sizeof(struct elf_prpsinfo) on Linux/kvx. */
elf_tdata (abfd)->core->pid = bfd_get_32 (abfd, note->descdata + 24);
elf_tdata (abfd)->core->program
= _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
elf_tdata (abfd)->core->command
= _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
break;
default:
return false;
}
/* Note that for some reason, a spurious space is tacked
onto the end of the args in some (at least one anyway)
implementations, so strip it off if it exists. */
{
char *command = elf_tdata (abfd)->core->command;
int n = strlen (command);
if (n > 0 && command[n - 1] == ' ')
command[n - 1] = 0;
}
return true;
}
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