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gnu / binutils-gdb / 67b8e30af907d8c19f50343268d7c6db85347ee2 / . / bfd / elf32-rx.c
blob: db1ab777d3f7f0c0c7a28a3320423207bad8bebe [file] [log] [blame]
/* Renesas RX specific support for 32-bit ELF.
Copyright (C) 2008-2024 Free Software Foundation, Inc.
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; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/rx.h"
#include "libiberty.h"
#include "elf32-rx.h"
#define RX_OPCODE_BIG_ENDIAN 0
/* This is a meta-target that's used only with objcopy, to avoid the
endian-swap we would otherwise get. We check for this in
rx_elf_object_p(). */
const bfd_target rx_elf32_be_ns_vec;
const bfd_target rx_elf32_be_vec;
#ifdef DEBUG
char * rx_get_reloc (long);
void rx_dump_symtab (bfd *, void *, void *);
#endif
#define RXREL(n,sz,bit,shift,complain,pcrel) \
HOWTO (R_RX_##n, shift, sz, bit, pcrel, 0, complain_overflow_ ## complain, \
bfd_elf_generic_reloc, "R_RX_" #n, false, 0, ~0, false)
/* Note that the relocations around 0x7f are internal to this file;
feel free to move them as needed to avoid conflicts with published
relocation numbers. */
static reloc_howto_type rx_elf_howto_table [] =
{
RXREL (NONE, 0, 0, 0, dont, false),
RXREL (DIR32, 4, 32, 0, signed, false),
RXREL (DIR24S, 4, 24, 0, signed, false),
RXREL (DIR16, 2, 16, 0, dont, false),
RXREL (DIR16U, 2, 16, 0, unsigned, false),
RXREL (DIR16S, 2, 16, 0, signed, false),
RXREL (DIR8, 1, 8, 0, dont, false),
RXREL (DIR8U, 1, 8, 0, unsigned, false),
RXREL (DIR8S, 1, 8, 0, signed, false),
RXREL (DIR24S_PCREL, 4, 24, 0, signed, true),
RXREL (DIR16S_PCREL, 2, 16, 0, signed, true),
RXREL (DIR8S_PCREL, 1, 8, 0, signed, true),
RXREL (DIR16UL, 2, 16, 2, unsigned, false),
RXREL (DIR16UW, 2, 16, 1, unsigned, false),
RXREL (DIR8UL, 1, 8, 2, unsigned, false),
RXREL (DIR8UW, 1, 8, 1, unsigned, false),
RXREL (DIR32_REV, 2, 16, 0, dont, false),
RXREL (DIR16_REV, 2, 16, 0, dont, false),
RXREL (DIR3U_PCREL, 1, 3, 0, dont, true),
EMPTY_HOWTO (0x13),
EMPTY_HOWTO (0x14),
EMPTY_HOWTO (0x15),
EMPTY_HOWTO (0x16),
EMPTY_HOWTO (0x17),
EMPTY_HOWTO (0x18),
EMPTY_HOWTO (0x19),
EMPTY_HOWTO (0x1a),
EMPTY_HOWTO (0x1b),
EMPTY_HOWTO (0x1c),
EMPTY_HOWTO (0x1d),
EMPTY_HOWTO (0x1e),
EMPTY_HOWTO (0x1f),
RXREL (RH_3_PCREL, 1, 3, 0, signed, true),
RXREL (RH_16_OP, 2, 16, 0, signed, false),
RXREL (RH_24_OP, 4, 24, 0, signed, false),
RXREL (RH_32_OP, 4, 32, 0, signed, false),
RXREL (RH_24_UNS, 4, 24, 0, unsigned, false),
RXREL (RH_8_NEG, 1, 8, 0, signed, false),
RXREL (RH_16_NEG, 2, 16, 0, signed, false),
RXREL (RH_24_NEG, 4, 24, 0, signed, false),
RXREL (RH_32_NEG, 4, 32, 0, signed, false),
RXREL (RH_DIFF, 4, 32, 0, signed, false),
RXREL (RH_GPRELB, 2, 16, 0, unsigned, false),
RXREL (RH_GPRELW, 2, 16, 0, unsigned, false),
RXREL (RH_GPRELL, 2, 16, 0, unsigned, false),
RXREL (RH_RELAX, 0, 0, 0, dont, false),
EMPTY_HOWTO (0x2e),
EMPTY_HOWTO (0x2f),
EMPTY_HOWTO (0x30),
EMPTY_HOWTO (0x31),
EMPTY_HOWTO (0x32),
EMPTY_HOWTO (0x33),
EMPTY_HOWTO (0x34),
EMPTY_HOWTO (0x35),
EMPTY_HOWTO (0x36),
EMPTY_HOWTO (0x37),
EMPTY_HOWTO (0x38),
EMPTY_HOWTO (0x39),
EMPTY_HOWTO (0x3a),
EMPTY_HOWTO (0x3b),
EMPTY_HOWTO (0x3c),
EMPTY_HOWTO (0x3d),
EMPTY_HOWTO (0x3e),
EMPTY_HOWTO (0x3f),
EMPTY_HOWTO (0x40),
RXREL (ABS32, 4, 32, 0, dont, false),
RXREL (ABS24S, 4, 24, 0, signed, false),
RXREL (ABS16, 2, 16, 0, dont, false),
RXREL (ABS16U, 2, 16, 0, unsigned, false),
RXREL (ABS16S, 2, 16, 0, signed, false),
RXREL (ABS8, 1, 8, 0, dont, false),
RXREL (ABS8U, 1, 8, 0, unsigned, false),
RXREL (ABS8S, 1, 8, 0, signed, false),
RXREL (ABS24S_PCREL, 4, 24, 0, signed, true),
RXREL (ABS16S_PCREL, 2, 16, 0, signed, true),
RXREL (ABS8S_PCREL, 1, 8, 0, signed, true),
RXREL (ABS16UL, 2, 16, 0, unsigned, false),
RXREL (ABS16UW, 2, 16, 0, unsigned, false),
RXREL (ABS8UL, 1, 8, 0, unsigned, false),
RXREL (ABS8UW, 1, 8, 0, unsigned, false),
RXREL (ABS32_REV, 4, 32, 0, dont, false),
RXREL (ABS16_REV, 2, 16, 0, dont, false),
#define STACK_REL_P(x) ((x) <= R_RX_ABS16_REV && (x) >= R_RX_ABS32)
EMPTY_HOWTO (0x52),
EMPTY_HOWTO (0x53),
EMPTY_HOWTO (0x54),
EMPTY_HOWTO (0x55),
EMPTY_HOWTO (0x56),
EMPTY_HOWTO (0x57),
EMPTY_HOWTO (0x58),
EMPTY_HOWTO (0x59),
EMPTY_HOWTO (0x5a),
EMPTY_HOWTO (0x5b),
EMPTY_HOWTO (0x5c),
EMPTY_HOWTO (0x5d),
EMPTY_HOWTO (0x5e),
EMPTY_HOWTO (0x5f),
EMPTY_HOWTO (0x60),
EMPTY_HOWTO (0x61),
EMPTY_HOWTO (0x62),
EMPTY_HOWTO (0x63),
EMPTY_HOWTO (0x64),
EMPTY_HOWTO (0x65),
EMPTY_HOWTO (0x66),
EMPTY_HOWTO (0x67),
EMPTY_HOWTO (0x68),
EMPTY_HOWTO (0x69),
EMPTY_HOWTO (0x6a),
EMPTY_HOWTO (0x6b),
EMPTY_HOWTO (0x6c),
EMPTY_HOWTO (0x6d),
EMPTY_HOWTO (0x6e),
EMPTY_HOWTO (0x6f),
EMPTY_HOWTO (0x70),
EMPTY_HOWTO (0x71),
EMPTY_HOWTO (0x72),
EMPTY_HOWTO (0x73),
EMPTY_HOWTO (0x74),
EMPTY_HOWTO (0x75),
EMPTY_HOWTO (0x76),
EMPTY_HOWTO (0x77),
/* These are internal. */
/* A 5-bit unsigned displacement to a B/W/L address, at bit position 8/12. */
/* ---- ---- 4--- 3210. */
#define R_RX_RH_ABS5p8B 0x78
RXREL (RH_ABS5p8B, 0, 0, 0, dont, false),
#define R_RX_RH_ABS5p8W 0x79
RXREL (RH_ABS5p8W, 0, 0, 0, dont, false),
#define R_RX_RH_ABS5p8L 0x7a
RXREL (RH_ABS5p8L, 0, 0, 0, dont, false),
/* A 5-bit unsigned displacement to a B/W/L address, at bit position 5/12. */
/* ---- -432 1--- 0---. */
#define R_RX_RH_ABS5p5B 0x7b
RXREL (RH_ABS5p5B, 0, 0, 0, dont, false),
#define R_RX_RH_ABS5p5W 0x7c
RXREL (RH_ABS5p5W, 0, 0, 0, dont, false),
#define R_RX_RH_ABS5p5L 0x7d
RXREL (RH_ABS5p5L, 0, 0, 0, dont, false),
/* A 4-bit unsigned immediate at bit position 8. */
#define R_RX_RH_UIMM4p8 0x7e
RXREL (RH_UIMM4p8, 0, 0, 0, dont, false),
/* A 4-bit negative unsigned immediate at bit position 8. */
#define R_RX_RH_UNEG4p8 0x7f
RXREL (RH_UNEG4p8, 0, 0, 0, dont, false),
/* End of internal relocs. */
RXREL (SYM, 4, 32, 0, dont, false),
RXREL (OPneg, 4, 32, 0, dont, false),
RXREL (OPadd, 4, 32, 0, dont, false),
RXREL (OPsub, 4, 32, 0, dont, false),
RXREL (OPmul, 4, 32, 0, dont, false),
RXREL (OPdiv, 4, 32, 0, dont, false),
RXREL (OPshla, 4, 32, 0, dont, false),
RXREL (OPshra, 4, 32, 0, dont, false),
RXREL (OPsctsize, 4, 32, 0, dont, false),
EMPTY_HOWTO (0x89),
EMPTY_HOWTO (0x8a),
EMPTY_HOWTO (0x8b),
EMPTY_HOWTO (0x8c),
RXREL (OPscttop, 4, 32, 0, dont, false),
EMPTY_HOWTO (0x8e),
EMPTY_HOWTO (0x8f),
RXREL (OPand, 4, 32, 0, dont, false),
RXREL (OPor, 4, 32, 0, dont, false),
RXREL (OPxor, 4, 32, 0, dont, false),
RXREL (OPnot, 4, 32, 0, dont, false),
RXREL (OPmod, 4, 32, 0, dont, false),
RXREL (OPromtop, 4, 32, 0, dont, false),
RXREL (OPramtop, 4, 32, 0, dont, false)
};
/* Map BFD reloc types to RX ELF reloc types. */
struct rx_reloc_map
{
bfd_reloc_code_real_type bfd_reloc_val;
unsigned int rx_reloc_val;
};
static const struct rx_reloc_map rx_reloc_map [] =
{
{ BFD_RELOC_NONE, R_RX_NONE },
{ BFD_RELOC_8, R_RX_DIR8S },
{ BFD_RELOC_16, R_RX_DIR16S },
{ BFD_RELOC_24, R_RX_DIR24S },
{ BFD_RELOC_32, R_RX_DIR32 },
{ BFD_RELOC_RX_16_OP, R_RX_DIR16 },
{ BFD_RELOC_RX_DIR3U_PCREL, R_RX_DIR3U_PCREL },
{ BFD_RELOC_8_PCREL, R_RX_DIR8S_PCREL },
{ BFD_RELOC_16_PCREL, R_RX_DIR16S_PCREL },
{ BFD_RELOC_24_PCREL, R_RX_DIR24S_PCREL },
{ BFD_RELOC_RX_8U, R_RX_DIR8U },
{ BFD_RELOC_RX_16U, R_RX_DIR16U },
{ BFD_RELOC_RX_24U, R_RX_RH_24_UNS },
{ BFD_RELOC_RX_NEG8, R_RX_RH_8_NEG },
{ BFD_RELOC_RX_NEG16, R_RX_RH_16_NEG },
{ BFD_RELOC_RX_NEG24, R_RX_RH_24_NEG },
{ BFD_RELOC_RX_NEG32, R_RX_RH_32_NEG },
{ BFD_RELOC_RX_DIFF, R_RX_RH_DIFF },
{ BFD_RELOC_RX_GPRELB, R_RX_RH_GPRELB },
{ BFD_RELOC_RX_GPRELW, R_RX_RH_GPRELW },
{ BFD_RELOC_RX_GPRELL, R_RX_RH_GPRELL },
{ BFD_RELOC_RX_RELAX, R_RX_RH_RELAX },
{ BFD_RELOC_RX_SYM, R_RX_SYM },
{ BFD_RELOC_RX_OP_SUBTRACT, R_RX_OPsub },
{ BFD_RELOC_RX_OP_NEG, R_RX_OPneg },
{ BFD_RELOC_RX_ABS8, R_RX_ABS8 },
{ BFD_RELOC_RX_ABS16, R_RX_ABS16 },
{ BFD_RELOC_RX_ABS16_REV, R_RX_ABS16_REV },
{ BFD_RELOC_RX_ABS32, R_RX_ABS32 },
{ BFD_RELOC_RX_ABS32_REV, R_RX_ABS32_REV },
{ BFD_RELOC_RX_ABS16UL, R_RX_ABS16UL },
{ BFD_RELOC_RX_ABS16UW, R_RX_ABS16UW },
{ BFD_RELOC_RX_ABS16U, R_RX_ABS16U }
};
#define BIGE(abfd) ((abfd)->xvec->byteorder == BFD_ENDIAN_BIG)
static reloc_howto_type *
rx_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
unsigned int i;
if (code == BFD_RELOC_RX_32_OP)
return rx_elf_howto_table + R_RX_DIR32;
for (i = ARRAY_SIZE (rx_reloc_map); i--;)
if (rx_reloc_map [i].bfd_reloc_val == code)
return rx_elf_howto_table + rx_reloc_map[i].rx_reloc_val;
return NULL;
}
static reloc_howto_type *
rx_reloc_name_lookup (bfd * abfd ATTRIBUTE_UNUSED, const char * r_name)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE (rx_elf_howto_table); i++)
if (rx_elf_howto_table[i].name != NULL
&& strcasecmp (rx_elf_howto_table[i].name, r_name) == 0)
return rx_elf_howto_table + i;
return NULL;
}
/* Set the howto pointer for an RX ELF reloc. */
static bool
rx_info_to_howto_rela (bfd * abfd,
arelent * cache_ptr,
Elf_Internal_Rela * dst)
{
unsigned int r_type;
r_type = ELF32_R_TYPE (dst->r_info);
BFD_ASSERT (R_RX_max == ARRAY_SIZE (rx_elf_howto_table));
if (r_type >= ARRAY_SIZE (rx_elf_howto_table))
{
/* xgettext:c-format */
_bfd_error_handler (_("%pB: unsupported relocation type %#x"),
abfd, r_type);
bfd_set_error (bfd_error_bad_value);
return false;
}
cache_ptr->howto = rx_elf_howto_table + r_type;
if (cache_ptr->howto->name == NULL)
{
/* xgettext:c-format */
_bfd_error_handler (_("%pB: unsupported relocation type %#x"),
abfd, r_type);
bfd_set_error (bfd_error_bad_value);
return false;
}
return true;
}
static bfd_vma
get_symbol_value (const char * name,
struct bfd_link_info * info,
bfd * input_bfd,
asection * input_section,
int offset)
{
bfd_vma value = 0;
struct bfd_link_hash_entry * h;
h = bfd_link_hash_lookup (info->hash, name, false, false, true);
if (h == NULL
|| (h->type != bfd_link_hash_defined
&& h->type != bfd_link_hash_defweak))
(*info->callbacks->undefined_symbol)
(info, name, input_bfd, input_section, offset, true);
else
value = (h->u.def.value
+ h->u.def.section->output_section->vma
+ h->u.def.section->output_offset);
return value;
}
static bfd_vma
get_symbol_value_maybe (const char * name,
struct bfd_link_info * info)
{
bfd_vma value = 0;
struct bfd_link_hash_entry * h;
h = bfd_link_hash_lookup (info->hash, name, false, false, true);
if (h == NULL
|| (h->type != bfd_link_hash_defined
&& h->type != bfd_link_hash_defweak))
return 0;
else
value = (h->u.def.value
+ h->u.def.section->output_section->vma
+ h->u.def.section->output_offset);
return value;
}
static bfd_vma
get_gp (struct bfd_link_info * info,
bfd * abfd,
asection * sec,
int offset)
{
static bool cached = false;
static bfd_vma cached_value = 0;
if (!cached)
{
cached_value = get_symbol_value ("__gp", info, abfd, sec, offset);
cached = true;
}
return cached_value;
}
static bfd_vma
get_romstart (struct bfd_link_info * info,
bfd * abfd,
asection * sec,
int offset)
{
static bool cached = false;
static bfd_vma cached_value = 0;
if (!cached)
{
cached_value = get_symbol_value ("_start", info, abfd, sec, offset);
cached = true;
}
return cached_value;
}
static bfd_vma
get_ramstart (struct bfd_link_info * info,
bfd * abfd,
asection * sec,
int offset)
{
static bool cached = false;
static bfd_vma cached_value = 0;
if (!cached)
{
cached_value = get_symbol_value ("__datastart", info, abfd, sec, offset);
cached = true;
}
return cached_value;
}
#define NUM_STACK_ENTRIES 16
static int32_t rx_stack [ NUM_STACK_ENTRIES ];
static unsigned int rx_stack_top;
#define RX_STACK_PUSH(val) \
do \
{ \
if (rx_stack_top < NUM_STACK_ENTRIES) \
rx_stack [rx_stack_top ++] = (val); \
else \
r = bfd_reloc_dangerous; \
} \
while (0)
#define RX_STACK_POP(dest) \
do \
{ \
if (rx_stack_top > 0) \
(dest) = rx_stack [-- rx_stack_top]; \
else \
(dest) = 0, r = bfd_reloc_dangerous; \
} \
while (0)
/* Relocate an RX ELF section.
There is some attempt to make this function usable for many architectures,
both USE_REL and USE_RELA ['twould be nice if such a critter existed],
if only to serve as a learning tool.
The RELOCATE_SECTION function is called by the new ELF backend linker
to handle the relocations for a section.
The relocs are always passed as Rela structures; if the section
actually uses Rel structures, the r_addend field will always be
zero.
This function is responsible for adjusting the section contents as
necessary, and (if using Rela relocs and generating a relocatable
output file) adjusting the reloc addend as necessary.
This function does not have to worry about setting the reloc
address or the reloc symbol index.
LOCAL_SYMS is a pointer to the swapped in local symbols.
LOCAL_SECTIONS is an array giving the section in the input file
corresponding to the st_shndx field of each local symbol.
The global hash table entry for the global symbols can be found
via elf_sym_hashes (input_bfd).
When generating relocatable output, this function must handle
STB_LOCAL/STT_SECTION symbols specially. The output symbol is
going to be the section symbol corresponding to the output
section, which means that the addend must be adjusted
accordingly. */
static int
rx_elf_relocate_section
(bfd * output_bfd,
struct bfd_link_info * info,
bfd * input_bfd,
asection * input_section,
bfd_byte * contents,
Elf_Internal_Rela * relocs,
Elf_Internal_Sym * local_syms,
asection ** local_sections)
{
Elf_Internal_Shdr *symtab_hdr;
struct elf_link_hash_entry **sym_hashes;
Elf_Internal_Rela *rel;
Elf_Internal_Rela *relend;
bool pid_mode;
bool saw_subtract = false;
const char *table_default_cache = NULL;
bfd_vma table_start_cache = 0;
bfd_vma table_end_cache = 0;
if (elf_elfheader (output_bfd)->e_flags & E_FLAG_RX_PID)
pid_mode = true;
else
pid_mode = false;
symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
sym_hashes = elf_sym_hashes (input_bfd);
relend = relocs + input_section->reloc_count;
for (rel = relocs; rel < relend; rel ++)
{
reloc_howto_type *howto;
unsigned long r_symndx;
Elf_Internal_Sym *sym;
asection *sec;
struct elf_link_hash_entry *h;
bfd_vma relocation;
bfd_reloc_status_type r;
const char * name = NULL;
bool unresolved_reloc = true;
int r_type;
r_type = ELF32_R_TYPE (rel->r_info);
r_symndx = ELF32_R_SYM (rel->r_info);
howto = rx_elf_howto_table + ELF32_R_TYPE (rel->r_info);
h = NULL;
sym = NULL;
sec = NULL;
relocation = 0;
if (rx_stack_top == 0)
saw_subtract = false;
if (r_symndx < symtab_hdr->sh_info)
{
sym = local_syms + r_symndx;
sec = local_sections [r_symndx];
relocation = _bfd_elf_rela_local_sym (output_bfd, sym, & sec, rel);
name = bfd_elf_string_from_elf_section
(input_bfd, symtab_hdr->sh_link, sym->st_name);
name = sym->st_name == 0 ? bfd_section_name (sec) : name;
}
else
{
bool warned, ignored;
RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
r_symndx, symtab_hdr, sym_hashes, h,
sec, relocation, unresolved_reloc,
warned, ignored);
name = h->root.root.string;
}
if (startswith (name, "$tableentry$default$"))
{
bfd_vma entry_vma;
int idx;
char *buf;
if (table_default_cache != name)
{
/* All relocs for a given table should be to the same
(weak) default symbol) so we can use it to detect a
cache miss. We use the offset into the table to find
the "real" symbol. Calculate and store the table's
offset here. */
table_default_cache = name;
/* We have already done error checking in rx_table_find(). */
buf = (char *) bfd_malloc (13 + strlen (name + 20));
if (buf == NULL)
return false;
sprintf (buf, "$tablestart$%s", name + 20);
table_start_cache = get_symbol_value (buf,
info,
input_bfd,
input_section,
rel->r_offset);
sprintf (buf, "$tableend$%s", name + 20);
table_end_cache = get_symbol_value (buf,
info,
input_bfd,
input_section,
rel->r_offset);
free (buf);
}
entry_vma = (input_section->output_section->vma
+ input_section->output_offset
+ rel->r_offset);
if (table_end_cache <= entry_vma || entry_vma < table_start_cache)
{
/* xgettext:c-format */
_bfd_error_handler (_("%pB:%pA: table entry %s outside table"),
input_bfd, input_section,
name);
}
else if ((int) (entry_vma - table_start_cache) % 4)
{
/* xgettext:c-format */
_bfd_error_handler (_("%pB:%pA: table entry %s not word-aligned within table"),
input_bfd, input_section,
name);
}
else
{
idx = (int) (entry_vma - table_start_cache) / 4;
/* This will look like $tableentry$<N>$<name> */
buf = (char *) bfd_malloc (12 + 20 + strlen (name + 20));
if (buf == NULL)
return false;
sprintf (buf, "$tableentry$%d$%s", idx, name + 20);
h = (struct elf_link_hash_entry *) bfd_link_hash_lookup (info->hash, buf, false, false, true);
if (h)
{
relocation = (h->root.u.def.value
+ h->root.u.def.section->output_section->vma
+ h->root.u.def.section->output_offset);;
}
free (buf);
}
}
if (sec != NULL && discarded_section (sec))
RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
rel, 1, relend, howto, 0, contents);
if (bfd_link_relocatable (info))
{
/* This is a relocatable link. We don't have to change
anything, unless the reloc is against a section symbol,
in which case we have to adjust according to where the
section symbol winds up in the output section. */
if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
rel->r_addend += sec->output_offset;
continue;
}
if (h != NULL && h->root.type == bfd_link_hash_undefweak)
/* If the symbol is undefined and weak
then the relocation resolves to zero. */
relocation = 0;
else
{
if (howto->pc_relative)
{
relocation -= (input_section->output_section->vma
+ input_section->output_offset
+ rel->r_offset);
if (r_type != R_RX_RH_3_PCREL
&& r_type != R_RX_DIR3U_PCREL)
relocation ++;
}
relocation += rel->r_addend;
}
r = bfd_reloc_ok;
#define RANGE(a,b) \
if (a > (long) relocation || (long) relocation > b) \
r = bfd_reloc_overflow
#define ALIGN(m) \
if (relocation & m) \
r = bfd_reloc_other
#define OP(i) \
(contents[rel->r_offset + (i)])
#define WARN_REDHAT(type) \
/* xgettext:c-format */ \
_bfd_error_handler \
(_("%pB:%pA: warning: deprecated Red Hat reloc " \
"%s detected against: %s"), \
input_bfd, input_section, #type, name)
/* Check for unsafe relocs in PID mode. These are any relocs where
an absolute address is being computed. There are special cases
for relocs against symbols that are known to be referenced in
crt0.o before the PID base address register has been initialised. */
#define UNSAFE_FOR_PID \
do \
{ \
if (pid_mode \
&& sec != NULL \
&& sec->flags & SEC_READONLY \
&& !(input_section->flags & SEC_DEBUGGING) \
&& strcmp (name, "__pid_base") != 0 \
&& strcmp (name, "__gp") != 0 \
&& strcmp (name, "__romdatastart") != 0 \
&& !saw_subtract) \
/* xgettext:c-format */ \
_bfd_error_handler (_("%pB(%pA): unsafe PID relocation %s " \
"at %#" PRIx64 " (against %s in %s)"), \
input_bfd, input_section, howto->name, \
(uint64_t) (input_section->output_section->vma \
+ input_section->output_offset \
+ rel->r_offset), \
name, sec->name); \
} \
while (0)
/* Opcode relocs are always big endian. Data relocs are bi-endian. */
switch (r_type)
{
case R_RX_NONE:
break;
case R_RX_RH_RELAX:
break;
case R_RX_RH_3_PCREL:
WARN_REDHAT ("RX_RH_3_PCREL");
RANGE (3, 10);
OP (0) &= 0xf8;
OP (0) |= relocation & 0x07;
break;
case R_RX_RH_8_NEG:
WARN_REDHAT ("RX_RH_8_NEG");
relocation = - relocation;
/* Fall through. */
case R_RX_DIR8S_PCREL:
UNSAFE_FOR_PID;
RANGE (-128, 127);
OP (0) = relocation;
break;
case R_RX_DIR8S:
UNSAFE_FOR_PID;
RANGE (-128, 255);
OP (0) = relocation;
break;
case R_RX_DIR8U:
UNSAFE_FOR_PID;
RANGE (0, 255);
OP (0) = relocation;
break;
case R_RX_RH_16_NEG:
WARN_REDHAT ("RX_RH_16_NEG");
relocation = - relocation;
/* Fall through. */
case R_RX_DIR16S_PCREL:
UNSAFE_FOR_PID;
RANGE (-32768, 32767);
#if RX_OPCODE_BIG_ENDIAN
#else
OP (0) = relocation;
OP (1) = relocation >> 8;
#endif
break;
case R_RX_RH_16_OP:
WARN_REDHAT ("RX_RH_16_OP");
UNSAFE_FOR_PID;
RANGE (-32768, 32767);
#if RX_OPCODE_BIG_ENDIAN
OP (1) = relocation;
OP (0) = relocation >> 8;
#else
OP (0) = relocation;
OP (1) = relocation >> 8;
#endif
break;
case R_RX_DIR16S:
UNSAFE_FOR_PID;
RANGE (-32768, 65535);
if (BIGE (output_bfd) && !(input_section->flags & SEC_CODE))
{
OP (1) = relocation;
OP (0) = relocation >> 8;
}
else
{
OP (0) = relocation;
OP (1) = relocation >> 8;
}
break;
case R_RX_DIR16U:
UNSAFE_FOR_PID;
RANGE (0, 65536);
#if RX_OPCODE_BIG_ENDIAN
OP (1) = relocation;
OP (0) = relocation >> 8;
#else
OP (0) = relocation;
OP (1) = relocation >> 8;
#endif
break;
case R_RX_DIR16:
UNSAFE_FOR_PID;
RANGE (-32768, 65536);
#if RX_OPCODE_BIG_ENDIAN
OP (1) = relocation;
OP (0) = relocation >> 8;
#else
OP (0) = relocation;
OP (1) = relocation >> 8;
#endif
break;
case R_RX_DIR16_REV:
UNSAFE_FOR_PID;
RANGE (-32768, 65536);
#if RX_OPCODE_BIG_ENDIAN
OP (0) = relocation;
OP (1) = relocation >> 8;
#else
OP (1) = relocation;
OP (0) = relocation >> 8;
#endif
break;
case R_RX_DIR3U_PCREL:
RANGE (3, 10);
OP (0) &= 0xf8;
OP (0) |= relocation & 0x07;
break;
case R_RX_RH_24_NEG:
UNSAFE_FOR_PID;
WARN_REDHAT ("RX_RH_24_NEG");
relocation = - relocation;
/* Fall through. */
case R_RX_DIR24S_PCREL:
RANGE (-0x800000, 0x7fffff);
#if RX_OPCODE_BIG_ENDIAN
OP (2) = relocation;
OP (1) = relocation >> 8;
OP (0) = relocation >> 16;
#else
OP (0) = relocation;
OP (1) = relocation >> 8;
OP (2) = relocation >> 16;
#endif
break;
case R_RX_RH_24_OP:
UNSAFE_FOR_PID;
WARN_REDHAT ("RX_RH_24_OP");
RANGE (-0x800000, 0x7fffff);
#if RX_OPCODE_BIG_ENDIAN
OP (2) = relocation;
OP (1) = relocation >> 8;
OP (0) = relocation >> 16;
#else
OP (0) = relocation;
OP (1) = relocation >> 8;
OP (2) = relocation >> 16;
#endif
break;
case R_RX_DIR24S:
UNSAFE_FOR_PID;
RANGE (-0x800000, 0x7fffff);
if (BIGE (output_bfd) && !(input_section->flags & SEC_CODE))
{
OP (2) = relocation;
OP (1) = relocation >> 8;
OP (0) = relocation >> 16;
}
else
{
OP (0) = relocation;
OP (1) = relocation >> 8;
OP (2) = relocation >> 16;
}
break;
case R_RX_RH_24_UNS:
UNSAFE_FOR_PID;
WARN_REDHAT ("RX_RH_24_UNS");
RANGE (0, 0xffffff);
#if RX_OPCODE_BIG_ENDIAN
OP (2) = relocation;
OP (1) = relocation >> 8;
OP (0) = relocation >> 16;
#else
OP (0) = relocation;
OP (1) = relocation >> 8;
OP (2) = relocation >> 16;
#endif
break;
case R_RX_RH_32_NEG:
UNSAFE_FOR_PID;
WARN_REDHAT ("RX_RH_32_NEG");
relocation = - relocation;
#if RX_OPCODE_BIG_ENDIAN
OP (3) = relocation;
OP (2) = relocation >> 8;
OP (1) = relocation >> 16;
OP (0) = relocation >> 24;
#else
OP (0) = relocation;
OP (1) = relocation >> 8;
OP (2) = relocation >> 16;
OP (3) = relocation >> 24;
#endif
break;
case R_RX_RH_32_OP:
UNSAFE_FOR_PID;
WARN_REDHAT ("RX_RH_32_OP");
#if RX_OPCODE_BIG_ENDIAN
OP (3) = relocation;
OP (2) = relocation >> 8;
OP (1) = relocation >> 16;
OP (0) = relocation >> 24;
#else
OP (0) = relocation;
OP (1) = relocation >> 8;
OP (2) = relocation >> 16;
OP (3) = relocation >> 24;
#endif
break;
case R_RX_DIR32:
if (BIGE (output_bfd) && !(input_section->flags & SEC_CODE))
{
OP (3) = relocation;
OP (2) = relocation >> 8;
OP (1) = relocation >> 16;
OP (0) = relocation >> 24;
}
else
{
OP (0) = relocation;
OP (1) = relocation >> 8;
OP (2) = relocation >> 16;
OP (3) = relocation >> 24;
}
break;
case R_RX_DIR32_REV:
if (BIGE (output_bfd))
{
OP (0) = relocation;
OP (1) = relocation >> 8;
OP (2) = relocation >> 16;
OP (3) = relocation >> 24;
}
else
{
OP (3) = relocation;
OP (2) = relocation >> 8;
OP (1) = relocation >> 16;
OP (0) = relocation >> 24;
}
break;
case R_RX_RH_DIFF:
{
bfd_vma val;
WARN_REDHAT ("RX_RH_DIFF");
val = bfd_get_32 (output_bfd, & OP (0));
val -= relocation;
bfd_put_32 (output_bfd, val, & OP (0));
}
break;
case R_RX_RH_GPRELB:
WARN_REDHAT ("RX_RH_GPRELB");
relocation -= get_gp (info, input_bfd, input_section, rel->r_offset);
RANGE (0, 65535);
#if RX_OPCODE_BIG_ENDIAN
OP (1) = relocation;
OP (0) = relocation >> 8;
#else
OP (0) = relocation;
OP (1) = relocation >> 8;
#endif
break;
case R_RX_RH_GPRELW:
WARN_REDHAT ("RX_RH_GPRELW");
relocation -= get_gp (info, input_bfd, input_section, rel->r_offset);
ALIGN (1);
relocation >>= 1;
RANGE (0, 65535);
#if RX_OPCODE_BIG_ENDIAN
OP (1) = relocation;
OP (0) = relocation >> 8;
#else
OP (0) = relocation;
OP (1) = relocation >> 8;
#endif
break;
case R_RX_RH_GPRELL:
WARN_REDHAT ("RX_RH_GPRELL");
relocation -= get_gp (info, input_bfd, input_section, rel->r_offset);
ALIGN (3);
relocation >>= 2;
RANGE (0, 65535);
#if RX_OPCODE_BIG_ENDIAN
OP (1) = relocation;
OP (0) = relocation >> 8;
#else
OP (0) = relocation;
OP (1) = relocation >> 8;
#endif
break;
/* Internal relocations just for relaxation: */
case R_RX_RH_ABS5p5B:
RX_STACK_POP (relocation);
RANGE (0, 31);
OP (0) &= 0xf8;
OP (0) |= relocation >> 2;
OP (1) &= 0x77;
OP (1) |= (relocation << 6) & 0x80;
OP (1) |= (relocation << 3) & 0x08;
break;
case R_RX_RH_ABS5p5W:
RX_STACK_POP (relocation);
RANGE (0, 62);
ALIGN (1);
relocation >>= 1;
OP (0) &= 0xf8;
OP (0) |= relocation >> 2;
OP (1) &= 0x77;
OP (1) |= (relocation << 6) & 0x80;
OP (1) |= (relocation << 3) & 0x08;
break;
case R_RX_RH_ABS5p5L:
RX_STACK_POP (relocation);
RANGE (0, 124);
ALIGN (3);
relocation >>= 2;
OP (0) &= 0xf8;
OP (0) |= relocation >> 2;
OP (1) &= 0x77;
OP (1) |= (relocation << 6) & 0x80;
OP (1) |= (relocation << 3) & 0x08;
break;
case R_RX_RH_ABS5p8B:
RX_STACK_POP (relocation);
RANGE (0, 31);
OP (0) &= 0x70;
OP (0) |= (relocation << 3) & 0x80;
OP (0) |= relocation & 0x0f;
break;
case R_RX_RH_ABS5p8W:
RX_STACK_POP (relocation);
RANGE (0, 62);
ALIGN (1);
relocation >>= 1;
OP (0) &= 0x70;
OP (0) |= (relocation << 3) & 0x80;
OP (0) |= relocation & 0x0f;
break;
case R_RX_RH_ABS5p8L:
RX_STACK_POP (relocation);
RANGE (0, 124);
ALIGN (3);
relocation >>= 2;
OP (0) &= 0x70;
OP (0) |= (relocation << 3) & 0x80;
OP (0) |= relocation & 0x0f;
break;
case R_RX_RH_UIMM4p8:
RANGE (0, 15);
OP (0) &= 0x0f;
OP (0) |= relocation << 4;
break;
case R_RX_RH_UNEG4p8:
RANGE (-15, 0);
OP (0) &= 0x0f;
OP (0) |= (-relocation) << 4;
break;
/* Complex reloc handling: */
case R_RX_ABS32:
UNSAFE_FOR_PID;
RX_STACK_POP (relocation);
#if RX_OPCODE_BIG_ENDIAN
OP (3) = relocation;
OP (2) = relocation >> 8;
OP (1) = relocation >> 16;
OP (0) = relocation >> 24;
#else
OP (0) = relocation;
OP (1) = relocation >> 8;
OP (2) = relocation >> 16;
OP (3) = relocation >> 24;
#endif
break;
case R_RX_ABS32_REV:
UNSAFE_FOR_PID;
RX_STACK_POP (relocation);
#if RX_OPCODE_BIG_ENDIAN
OP (0) = relocation;
OP (1) = relocation >> 8;
OP (2) = relocation >> 16;
OP (3) = relocation >> 24;
#else
OP (3) = relocation;
OP (2) = relocation >> 8;
OP (1) = relocation >> 16;
OP (0) = relocation >> 24;
#endif
break;
case R_RX_ABS24S_PCREL:
case R_RX_ABS24S:
UNSAFE_FOR_PID;
RX_STACK_POP (relocation);
RANGE (-0x800000, 0x7fffff);
if (BIGE (output_bfd) && !(input_section->flags & SEC_CODE))
{
OP (2) = relocation;
OP (1) = relocation >> 8;
OP (0) = relocation >> 16;
}
else
{
OP (0) = relocation;
OP (1) = relocation >> 8;
OP (2) = relocation >> 16;
}
break;
case R_RX_ABS16:
UNSAFE_FOR_PID;
RX_STACK_POP (relocation);
RANGE (-32768, 65535);
#if RX_OPCODE_BIG_ENDIAN
OP (1) = relocation;
OP (0) = relocation >> 8;
#else
OP (0) = relocation;
OP (1) = relocation >> 8;
#endif
break;
case R_RX_ABS16_REV:
UNSAFE_FOR_PID;
RX_STACK_POP (relocation);
RANGE (-32768, 65535);
#if RX_OPCODE_BIG_ENDIAN
OP (0) = relocation;
OP (1) = relocation >> 8;
#else
OP (1) = relocation;
OP (0) = relocation >> 8;
#endif
break;
case R_RX_ABS16S_PCREL:
case R_RX_ABS16S:
RX_STACK_POP (relocation);
RANGE (-32768, 32767);
if (BIGE (output_bfd) && !(input_section->flags & SEC_CODE))
{
OP (1) = relocation;
OP (0) = relocation >> 8;
}
else
{
OP (0) = relocation;
OP (1) = relocation >> 8;
}
break;
case R_RX_ABS16U:
UNSAFE_FOR_PID;
RX_STACK_POP (relocation);
RANGE (0, 65536);
#if RX_OPCODE_BIG_ENDIAN
OP (1) = relocation;
OP (0) = relocation >> 8;
#else
OP (0) = relocation;
OP (1) = relocation >> 8;
#endif
break;
case R_RX_ABS16UL:
UNSAFE_FOR_PID;
RX_STACK_POP (relocation);
relocation >>= 2;
RANGE (0, 65536);
#if RX_OPCODE_BIG_ENDIAN
OP (1) = relocation;
OP (0) = relocation >> 8;
#else
OP (0) = relocation;
OP (1) = relocation >> 8;
#endif
break;
case R_RX_ABS16UW:
UNSAFE_FOR_PID;
RX_STACK_POP (relocation);
relocation >>= 1;
RANGE (0, 65536);
#if RX_OPCODE_BIG_ENDIAN
OP (1) = relocation;
OP (0) = relocation >> 8;
#else
OP (0) = relocation;
OP (1) = relocation >> 8;
#endif
break;
case R_RX_ABS8:
UNSAFE_FOR_PID;
RX_STACK_POP (relocation);
RANGE (-128, 255);
OP (0) = relocation;
break;
case R_RX_ABS8U:
UNSAFE_FOR_PID;
RX_STACK_POP (relocation);
RANGE (0, 255);
OP (0) = relocation;
break;
case R_RX_ABS8UL:
UNSAFE_FOR_PID;
RX_STACK_POP (relocation);
relocation >>= 2;
RANGE (0, 255);
OP (0) = relocation;
break;
case R_RX_ABS8UW:
UNSAFE_FOR_PID;
RX_STACK_POP (relocation);
relocation >>= 1;
RANGE (0, 255);
OP (0) = relocation;
break;
case R_RX_ABS8S:
UNSAFE_FOR_PID;
/* Fall through. */
case R_RX_ABS8S_PCREL:
RX_STACK_POP (relocation);
RANGE (-128, 127);
OP (0) = relocation;
break;
case R_RX_SYM:
if (r_symndx < symtab_hdr->sh_info)
RX_STACK_PUSH (sec->output_section->vma
+ sec->output_offset
+ sym->st_value
+ rel->r_addend);
else
{
if (h != NULL
&& (h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak))
RX_STACK_PUSH (h->root.u.def.value
+ sec->output_section->vma
+ sec->output_offset
+ rel->r_addend);
else
_bfd_error_handler
(_("warning: RX_SYM reloc with an unknown symbol"));
}
break;
case R_RX_OPneg:
{
int32_t tmp;
saw_subtract = true;
RX_STACK_POP (tmp);
tmp = - tmp;
RX_STACK_PUSH (tmp);
}
break;
case R_RX_OPadd:
{
int32_t tmp1, tmp2;
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp1 += tmp2;
RX_STACK_PUSH (tmp1);
}
break;
case R_RX_OPsub:
{
int32_t tmp1, tmp2;
saw_subtract = true;
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp2 -= tmp1;
RX_STACK_PUSH (tmp2);
}
break;
case R_RX_OPmul:
{
int32_t tmp1, tmp2;
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp1 *= tmp2;
RX_STACK_PUSH (tmp1);
}
break;
case R_RX_OPdiv:
{
int32_t tmp1, tmp2;
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp1 /= tmp2;
RX_STACK_PUSH (tmp1);
}
break;
case R_RX_OPshla:
{
int32_t tmp1, tmp2;
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp1 <<= tmp2;
RX_STACK_PUSH (tmp1);
}
break;
case R_RX_OPshra:
{
int32_t tmp1, tmp2;
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp1 >>= tmp2;
RX_STACK_PUSH (tmp1);
}
break;
case R_RX_OPsctsize:
RX_STACK_PUSH (input_section->size);
break;
case R_RX_OPscttop:
RX_STACK_PUSH (input_section->output_section->vma);
break;
case R_RX_OPand:
{
int32_t tmp1, tmp2;
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp1 &= tmp2;
RX_STACK_PUSH (tmp1);
}
break;
case R_RX_OPor:
{
int32_t tmp1, tmp2;
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp1 |= tmp2;
RX_STACK_PUSH (tmp1);
}
break;
case R_RX_OPxor:
{
int32_t tmp1, tmp2;
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp1 ^= tmp2;
RX_STACK_PUSH (tmp1);
}
break;
case R_RX_OPnot:
{
int32_t tmp;
RX_STACK_POP (tmp);
tmp = ~ tmp;
RX_STACK_PUSH (tmp);
}
break;
case R_RX_OPmod:
{
int32_t tmp1, tmp2;
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp1 %= tmp2;
RX_STACK_PUSH (tmp1);
}
break;
case R_RX_OPromtop:
RX_STACK_PUSH (get_romstart (info, input_bfd, input_section, rel->r_offset));
break;
case R_RX_OPramtop:
RX_STACK_PUSH (get_ramstart (info, input_bfd, input_section, rel->r_offset));
break;
default:
r = bfd_reloc_notsupported;
break;
}
if (r != bfd_reloc_ok)
{
const char * msg = NULL;
switch (r)
{
case bfd_reloc_overflow:
/* Catch the case of a missing function declaration
and emit a more helpful error message. */
if (r_type == R_RX_DIR24S_PCREL)
/* xgettext:c-format */
msg = _("%pB(%pA): error: call to undefined function '%s'");
else
(*info->callbacks->reloc_overflow)
(info, (h ? &h->root : NULL), name, howto->name, (bfd_vma) 0,
input_bfd, input_section, rel->r_offset);
break;
case bfd_reloc_undefined:
(*info->callbacks->undefined_symbol)
(info, name, input_bfd, input_section, rel->r_offset, true);
break;
case bfd_reloc_other:
/* xgettext:c-format */
msg = _("%pB(%pA): warning: unaligned access to symbol '%s' in the small data area");
break;
case bfd_reloc_outofrange:
/* xgettext:c-format */
msg = _("%pB(%pA): internal error: out of range error");
break;
case bfd_reloc_notsupported:
/* xgettext:c-format */
msg = _("%pB(%pA): internal error: unsupported relocation error");
break;
case bfd_reloc_dangerous:
/* xgettext:c-format */
msg = _("%pB(%pA): internal error: dangerous relocation");
break;
default:
/* xgettext:c-format */
msg = _("%pB(%pA): internal error: unknown error");
break;
}
if (msg)
_bfd_error_handler (msg, input_bfd, input_section, name);
}
}
return true;
}
/* Relaxation Support. */
/* Progression of relocations from largest operand size to smallest
operand size. */
static int
next_smaller_reloc (int r)
{
switch (r)
{
case R_RX_DIR32: return R_RX_DIR24S;
case R_RX_DIR24S: return R_RX_DIR16S;
case R_RX_DIR16S: return R_RX_DIR8S;
case R_RX_DIR8S: return R_RX_NONE;
case R_RX_DIR16: return R_RX_DIR8;
case R_RX_DIR8: return R_RX_NONE;
case R_RX_DIR16U: return R_RX_DIR8U;
case R_RX_DIR8U: return R_RX_NONE;
case R_RX_DIR24S_PCREL: return R_RX_DIR16S_PCREL;
case R_RX_DIR16S_PCREL: return R_RX_DIR8S_PCREL;
case R_RX_DIR8S_PCREL: return R_RX_DIR3U_PCREL;
case R_RX_DIR16UL: return R_RX_DIR8UL;
case R_RX_DIR8UL: return R_RX_NONE;
case R_RX_DIR16UW: return R_RX_DIR8UW;
case R_RX_DIR8UW: return R_RX_NONE;
case R_RX_RH_32_OP: return R_RX_RH_24_OP;
case R_RX_RH_24_OP: return R_RX_RH_16_OP;
case R_RX_RH_16_OP: return R_RX_DIR8;
case R_RX_ABS32: return R_RX_ABS24S;
case R_RX_ABS24S: return R_RX_ABS16S;
case R_RX_ABS16: return R_RX_ABS8;
case R_RX_ABS16U: return R_RX_ABS8U;
case R_RX_ABS16S: return R_RX_ABS8S;
case R_RX_ABS8: return R_RX_NONE;
case R_RX_ABS8U: return R_RX_NONE;
case R_RX_ABS8S: return R_RX_NONE;
case R_RX_ABS24S_PCREL: return R_RX_ABS16S_PCREL;
case R_RX_ABS16S_PCREL: return R_RX_ABS8S_PCREL;
case R_RX_ABS8S_PCREL: return R_RX_NONE;
case R_RX_ABS16UL: return R_RX_ABS8UL;
case R_RX_ABS16UW: return R_RX_ABS8UW;
case R_RX_ABS8UL: return R_RX_NONE;
case R_RX_ABS8UW: return R_RX_NONE;
}
return r;
};
/* Delete some bytes from a section while relaxing. */
static bool
elf32_rx_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, int count,
Elf_Internal_Rela *alignment_rel, int force_snip,
Elf_Internal_Rela *irelstart)
{
Elf_Internal_Shdr * symtab_hdr;
unsigned int sec_shndx;
bfd_byte * contents;
Elf_Internal_Rela * irel;
Elf_Internal_Rela * irelend;
Elf_Internal_Sym * isym;
Elf_Internal_Sym * isymend;
bfd_vma toaddr;
unsigned int symcount;
struct elf_link_hash_entry ** sym_hashes;
struct elf_link_hash_entry ** end_hashes;
if (!alignment_rel)
force_snip = 1;
sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
contents = elf_section_data (sec)->this_hdr.contents;
/* The deletion must stop at the next alignment boundary, if
ALIGNMENT_REL is non-NULL. */
toaddr = sec->size;
if (alignment_rel)
toaddr = alignment_rel->r_offset;
BFD_ASSERT (toaddr > addr);
/* Actually delete the bytes. */
memmove (contents + addr, contents + addr + count,
(size_t) (toaddr - addr - count));
/* If we don't have an alignment marker to worry about, we can just
shrink the section. Otherwise, we have to fill in the newly
created gap with NOP insns (0x03). */
if (force_snip)
sec->size -= count;
else
memset (contents + toaddr - count, 0x03, count);
irel = irelstart;
BFD_ASSERT (irel != NULL || sec->reloc_count == 0);
irelend = irel + sec->reloc_count;
/* Adjust all the relocs. */
for (; irel < irelend; irel++)
{
/* Get the new reloc address. */
if (irel->r_offset > addr
&& (irel->r_offset < toaddr
|| (force_snip && irel->r_offset == toaddr)))
irel->r_offset -= count;
/* If we see an ALIGN marker at the end of the gap, we move it
to the beginning of the gap, since marking these gaps is what
they're for. */
if (irel->r_offset == toaddr
&& ELF32_R_TYPE (irel->r_info) == R_RX_RH_RELAX
&& irel->r_addend & RX_RELAXA_ALIGN)
irel->r_offset -= count;
}
/* Adjust the local symbols defined in this section. */
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
isym = (Elf_Internal_Sym *) symtab_hdr->contents;
isymend = isym + symtab_hdr->sh_info;
for (; isym < isymend; isym++)
{
/* If the symbol is in the range of memory we just moved, we
have to adjust its value. */
if (isym->st_shndx == sec_shndx
&& isym->st_value > addr
&& isym->st_value < toaddr)
isym->st_value -= count;
/* If the symbol *spans* the bytes we just deleted (i.e. it's
*end* is in the moved bytes but it's *start* isn't), then we
must adjust its size. */
if (isym->st_shndx == sec_shndx
&& isym->st_value < addr
&& isym->st_value + isym->st_size > addr
&& isym->st_value + isym->st_size < toaddr)
isym->st_size -= count;
}
/* Now adjust the global symbols defined in this section. */
symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
- symtab_hdr->sh_info);
sym_hashes = elf_sym_hashes (abfd);
end_hashes = sym_hashes + symcount;
for (; sym_hashes < end_hashes; sym_hashes++)
{
struct elf_link_hash_entry *sym_hash = *sym_hashes;
if ((sym_hash->root.type == bfd_link_hash_defined
|| sym_hash->root.type == bfd_link_hash_defweak)
&& sym_hash->root.u.def.section == sec)
{
/* As above, adjust the value if needed. */
if (sym_hash->root.u.def.value > addr
&& sym_hash->root.u.def.value < toaddr)
sym_hash->root.u.def.value -= count;
/* As above, adjust the size if needed. */
if (sym_hash->root.u.def.value < addr
&& sym_hash->root.u.def.value + sym_hash->size > addr
&& sym_hash->root.u.def.value + sym_hash->size < toaddr)
sym_hash->size -= count;
}
}
return true;
}
/* Used to sort relocs by address. If relocs have the same address,
we maintain their relative order, except that R_RX_RH_RELAX
alignment relocs must be the first reloc for any given address. */
static void
reloc_bubblesort (Elf_Internal_Rela * r, int count)
{
int i;
bool again;
bool swappit;
/* This is almost a classic bubblesort. It's the slowest sort, but
we're taking advantage of the fact that the relocations are
mostly in order already (the assembler emits them that way) and
we need relocs with the same address to remain in the same
relative order. */
again = true;
while (again)
{
again = false;
for (i = 0; i < count - 1; i ++)
{
if (r[i].r_offset > r[i + 1].r_offset)
swappit = true;
else if (r[i].r_offset < r[i + 1].r_offset)
swappit = false;
else if (ELF32_R_TYPE (r[i + 1].r_info) == R_RX_RH_RELAX
&& (r[i + 1].r_addend & RX_RELAXA_ALIGN))
swappit = true;
else if (ELF32_R_TYPE (r[i + 1].r_info) == R_RX_RH_RELAX
&& (r[i + 1].r_addend & RX_RELAXA_ELIGN)
&& !(ELF32_R_TYPE (r[i].r_info) == R_RX_RH_RELAX
&& (r[i].r_addend & RX_RELAXA_ALIGN)))
swappit = true;
else
swappit = false;
if (swappit)
{
Elf_Internal_Rela tmp;
tmp = r[i];
r[i] = r[i + 1];
r[i + 1] = tmp;
/* If we do move a reloc back, re-scan to see if it
needs to be moved even further back. This avoids
most of the O(n^2) behavior for our cases. */
if (i > 0)
i -= 2;
again = true;
}
}
}
}
#define OFFSET_FOR_RELOC(rel, lrel, scale) \
rx_offset_for_reloc (abfd, rel + 1, symtab_hdr, shndx_buf, intsyms, \
lrel, abfd, sec, link_info, scale)
static bfd_vma
rx_offset_for_reloc (bfd * abfd,
Elf_Internal_Rela * rel,
Elf_Internal_Shdr * symtab_hdr,
bfd_byte * shndx_buf ATTRIBUTE_UNUSED,
Elf_Internal_Sym * intsyms,
Elf_Internal_Rela ** lrel,
bfd * input_bfd,
asection * input_section,
struct bfd_link_info * info,
int * scale)
{
bfd_vma symval;
bfd_reloc_status_type r;
*scale = 1;
/* REL is the first of 1..N relocations. We compute the symbol
value for each relocation, then combine them if needed. LREL
gets a pointer to the last relocation used. */
while (1)
{
int32_t tmp1, tmp2;
/* Get the value of the symbol referred to by the reloc. */
if (ELF32_R_SYM (rel->r_info) < symtab_hdr->sh_info)
{
/* A local symbol. */
Elf_Internal_Sym *isym;
asection *ssec;
isym = intsyms + ELF32_R_SYM (rel->r_info);
if (isym->st_shndx == SHN_UNDEF)
ssec = bfd_und_section_ptr;
else if (isym->st_shndx == SHN_ABS)
ssec = bfd_abs_section_ptr;
else if (isym->st_shndx == SHN_COMMON)
ssec = bfd_com_section_ptr;
else
ssec = bfd_section_from_elf_index (abfd,
isym->st_shndx);
/* Initial symbol value. */
symval = isym->st_value;
/* GAS may have made this symbol relative to a section, in
which case, we have to add the addend to find the
symbol. */
if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
symval += rel->r_addend;
if (ssec)
{
if ((ssec->flags & SEC_MERGE)
&& ssec->sec_info_type == SEC_INFO_TYPE_MERGE)
symval = _bfd_merged_section_offset (abfd, & ssec,
elf_section_data (ssec)->sec_info,
symval);
}
/* Now make the offset relative to where the linker is putting it. */
if (ssec)
symval +=
ssec->output_section->vma + ssec->output_offset;
symval += rel->r_addend;
}
else
{
unsigned long indx;
struct elf_link_hash_entry * h;
/* An external symbol. */
indx = ELF32_R_SYM (rel->r_info) - symtab_hdr->sh_info;
h = elf_sym_hashes (abfd)[indx];
BFD_ASSERT (h != NULL);
if (h->root.type != bfd_link_hash_defined
&& h->root.type != bfd_link_hash_defweak)
{
/* This appears to be a reference to an undefined
symbol. Just ignore it--it will be caught by the
regular reloc processing. */
if (lrel)
*lrel = rel;
return 0;
}
symval = (h->root.u.def.value
+ h->root.u.def.section->output_section->vma
+ h->root.u.def.section->output_offset);
symval += rel->r_addend;
}
switch (ELF32_R_TYPE (rel->r_info))
{
case R_RX_SYM:
RX_STACK_PUSH (symval);
break;
case R_RX_OPneg:
RX_STACK_POP (tmp1);
tmp1 = - tmp1;
RX_STACK_PUSH (tmp1);
break;
case R_RX_OPadd:
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp1 += tmp2;
RX_STACK_PUSH (tmp1);
break;
case R_RX_OPsub:
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp2 -= tmp1;
RX_STACK_PUSH (tmp2);
break;
case R_RX_OPmul:
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp1 *= tmp2;
RX_STACK_PUSH (tmp1);
break;
case R_RX_OPdiv:
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp1 /= tmp2;
RX_STACK_PUSH (tmp1);
break;
case R_RX_OPshla:
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp1 <<= tmp2;
RX_STACK_PUSH (tmp1);
break;
case R_RX_OPshra:
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp1 >>= tmp2;
RX_STACK_PUSH (tmp1);
break;
case R_RX_OPsctsize:
RX_STACK_PUSH (input_section->size);
break;
case R_RX_OPscttop:
RX_STACK_PUSH (input_section->output_section->vma);
break;
case R_RX_OPand:
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp1 &= tmp2;
RX_STACK_PUSH (tmp1);
break;
case R_RX_OPor:
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp1 |= tmp2;
RX_STACK_PUSH (tmp1);
break;
case R_RX_OPxor:
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp1 ^= tmp2;
RX_STACK_PUSH (tmp1);
break;
case R_RX_OPnot:
RX_STACK_POP (tmp1);
tmp1 = ~ tmp1;
RX_STACK_PUSH (tmp1);
break;
case R_RX_OPmod:
RX_STACK_POP (tmp1);
RX_STACK_POP (tmp2);
tmp1 %= tmp2;
RX_STACK_PUSH (tmp1);
break;
case R_RX_OPromtop:
RX_STACK_PUSH (get_romstart (info, input_bfd, input_section, rel->r_offset));
break;
case R_RX_OPramtop:
RX_STACK_PUSH (get_ramstart (info, input_bfd, input_section, rel->r_offset));
break;
case R_RX_DIR16UL:
case R_RX_DIR8UL:
case R_RX_ABS16UL:
case R_RX_ABS8UL:
if (rx_stack_top)
RX_STACK_POP (symval);
if (lrel)
*lrel = rel;
*scale = 4;
return symval;
case R_RX_DIR16UW:
case R_RX_DIR8UW:
case R_RX_ABS16UW:
case R_RX_ABS8UW:
if (rx_stack_top)
RX_STACK_POP (symval);
if (lrel)
*lrel = rel;
*scale = 2;
return symval;
default:
if (rx_stack_top)
RX_STACK_POP (symval);
if (lrel)
*lrel = rel;
return symval;
}
rel ++;
}
/* FIXME. */
(void) r;
}
static void
move_reloc (Elf_Internal_Rela * irel, Elf_Internal_Rela * srel, int delta)
{
bfd_vma old_offset = srel->r_offset;
irel ++;
while (irel <= srel)
{
if (irel->r_offset == old_offset)
irel->r_offset += delta;
irel ++;
}
}
/* Relax one section. */
static bool
elf32_rx_relax_section (bfd *abfd,
asection *sec,
struct bfd_link_info *link_info,
bool *again,
bool allow_pcrel3)
{
Elf_Internal_Shdr *symtab_hdr;
Elf_Internal_Shdr *shndx_hdr;
Elf_Internal_Rela *internal_relocs;
Elf_Internal_Rela *irel;
Elf_Internal_Rela *srel;
Elf_Internal_Rela *irelend;
Elf_Internal_Rela *next_alignment;
Elf_Internal_Rela *prev_alignment;
bfd_byte *contents = NULL;
bfd_byte *free_contents = NULL;
Elf_Internal_Sym *intsyms = NULL;
Elf_Internal_Sym *free_intsyms = NULL;
bfd_byte *shndx_buf = NULL;
bfd_vma pc;
bfd_vma sec_start;
bfd_vma symval = 0;
int pcrel = 0;
int code = 0;
int section_alignment_glue;
/* how much to scale the relocation by - 1, 2, or 4. */
int scale;
/* Assume nothing changes. */
*again = false;
/* We don't have to do anything for a relocatable link, if
this section does not have relocs, or if this is not a
code section. */
if (bfd_link_relocatable (link_info)
|| sec->reloc_count == 0
|| (sec->flags & SEC_RELOC) == 0
|| (sec->flags & SEC_HAS_CONTENTS) == 0
|| (sec->flags & SEC_CODE) == 0)
return true;
symtab_hdr = & elf_symtab_hdr (abfd);
if (elf_symtab_shndx_list (abfd))
shndx_hdr = & elf_symtab_shndx_list (abfd)->hdr;
else
shndx_hdr = NULL;
sec_start = sec->output_section->vma + sec->output_offset;
/* Get the section contents. */
if (elf_section_data (sec)->this_hdr.contents != NULL)
contents = elf_section_data (sec)->this_hdr.contents;
/* Go get them off disk. */
else
{
if (! bfd_malloc_and_get_section (abfd, sec, &contents))
goto error_return;
elf_section_data (sec)->this_hdr.contents = contents;
}
/* Read this BFD's symbols. */
/* Get cached copy if it exists. */
if (symtab_hdr->contents != NULL)
intsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
else
{
intsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr, symtab_hdr->sh_info, 0, NULL, NULL, NULL);
symtab_hdr->contents = (bfd_byte *) intsyms;
}
if (shndx_hdr && shndx_hdr->sh_size != 0)
{
size_t amt;
if (_bfd_mul_overflow (symtab_hdr->sh_info,
sizeof (Elf_External_Sym_Shndx), &amt))
{
bfd_set_error (bfd_error_file_too_big);
goto error_return;
}
if (bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0)
goto error_return;
shndx_buf = _bfd_malloc_and_read (abfd, amt, amt);
if (shndx_buf == NULL)
goto error_return;
shndx_hdr->contents = shndx_buf;
}
/* Get a copy of the native relocations. */
/* Note - we ignore the setting of link_info->keep_memory when reading
in these relocs. We have to maintain a permanent copy of the relocs
because we are going to walk over them multiple times, adjusting them
as bytes are deleted from the section, and with this relaxation
function itself being called multiple times on the same section... */
internal_relocs = _bfd_elf_link_read_relocs
(abfd, sec, NULL, (Elf_Internal_Rela *) NULL, true);
if (internal_relocs == NULL)
goto error_return;
/* The RL_ relocs must be just before the operand relocs they go
with, so we must sort them to guarantee this. We use bubblesort
instead of qsort so we can guarantee that relocs with the same
address remain in the same relative order. */
reloc_bubblesort (internal_relocs, sec->reloc_count);
/* Walk through them looking for relaxing opportunities. */
irelend = internal_relocs + sec->reloc_count;
/* This will either be NULL or a pointer to the next alignment
relocation. */
next_alignment = internal_relocs;
/* This will be the previous alignment, although at first it points
to the first real relocation. */
prev_alignment = internal_relocs;
/* We calculate worst case shrinkage caused by alignment directives.
No fool-proof, but better than either ignoring the problem or
doing heavy duty analysis of all the alignment markers in all
input sections. */
section_alignment_glue = 0;
for (irel = internal_relocs; irel < irelend; irel++)
if (ELF32_R_TYPE (irel->r_info) == R_RX_RH_RELAX
&& irel->r_addend & RX_RELAXA_ALIGN)
{
int this_glue = 1 << (irel->r_addend & RX_RELAXA_ANUM);
if (section_alignment_glue < this_glue)
section_alignment_glue = this_glue;
}
/* Worst case is all 0..N alignments, in order, causing 2*N-1 byte
shrinkage. */
section_alignment_glue *= 2;
for (irel = internal_relocs; irel < irelend; irel++)
{
unsigned char *insn;
int nrelocs;
/* The insns we care about are all marked with one of these. */
if (ELF32_R_TYPE (irel->r_info) != R_RX_RH_RELAX)
continue;
if (irel->r_addend & RX_RELAXA_ALIGN
|| next_alignment == internal_relocs)
{
/* When we delete bytes, we need to maintain all the alignments
indicated. In addition, we need to be careful about relaxing
jumps across alignment boundaries - these displacements
*grow* when we delete bytes. For now, don't shrink
displacements across an alignment boundary, just in case.
Note that this only affects relocations to the same
section. */
prev_alignment = next_alignment;
next_alignment += 2;
while (next_alignment < irelend
&& (ELF32_R_TYPE (next_alignment->r_info) != R_RX_RH_RELAX
|| !(next_alignment->r_addend & RX_RELAXA_ELIGN)))
next_alignment ++;
if (next_alignment >= irelend || next_alignment->r_offset == 0)
next_alignment = NULL;
}
/* When we hit alignment markers, see if we've shrunk enough
before them to reduce the gap without violating the alignment
requirements. */
if (irel->r_addend & RX_RELAXA_ALIGN)
{
/* At this point, the next relocation *should* be the ELIGN
end marker. */
Elf_Internal_Rela *erel = irel + 1;
unsigned int alignment, nbytes;
if (ELF32_R_TYPE (erel->r_info) != R_RX_RH_RELAX)
continue;
if (!(erel->r_addend & RX_RELAXA_ELIGN))
continue;
alignment = 1 << (irel->r_addend & RX_RELAXA_ANUM);
if (erel->r_offset - irel->r_offset < alignment)
continue;
nbytes = erel->r_offset - irel->r_offset;
nbytes /= alignment;
nbytes *= alignment;
elf32_rx_relax_delete_bytes (abfd, sec, erel->r_offset-nbytes, nbytes, next_alignment,
erel->r_offset == sec->size, internal_relocs);
*again = true;
continue;
}
if (irel->r_addend & RX_RELAXA_ELIGN)
continue;
insn = contents + irel->r_offset;
nrelocs = irel->r_addend & RX_RELAXA_RNUM;
/* At this point, we have an insn that is a candidate for linker
relaxation. There are NRELOCS relocs following that may be
relaxed, although each reloc may be made of more than one
reloc entry (such as gp-rel symbols). */
/* Get the value of the symbol referred to by the reloc. Just
in case this is the last reloc in the list, use the RL's
addend to choose between this reloc (no addend) or the next
(yes addend, which means at least one following reloc). */
/* srel points to the "current" reloction for this insn -
actually the last reloc for a given operand, which is the one
we need to update. We check the relaxations in the same
order that the relocations happen, so we'll just push it
along as we go. */
srel = irel;
pc = sec->output_section->vma + sec->output_offset
+ srel->r_offset;
#define GET_RELOC \
symval = OFFSET_FOR_RELOC (srel, &srel, &scale); \
pcrel = symval - pc + srel->r_addend; \
nrelocs --;
#define SNIPNR(offset, nbytes) \
elf32_rx_relax_delete_bytes (abfd, sec, (insn - contents) + offset, nbytes, next_alignment, 0, internal_relocs);
#define SNIP(offset, nbytes, newtype) \
SNIPNR (offset, nbytes); \
srel->r_info = ELF32_R_INFO (ELF32_R_SYM (srel->r_info), newtype)
/* The order of these bit tests must match the order that the
relocs appear in. Since we sorted those by offset, we can
predict them. */
/* Note that the numbers in, say, DSP6 are the bit offsets of
the code fields that describe the operand. Bits number 0 for
the MSB of insn[0]. */
/* DSP* codes:
0 00 [reg]
1 01 dsp:8[reg]
2 10 dsp:16[reg]
3 11 reg */
if (irel->r_addend & RX_RELAXA_DSP6)
{
GET_RELOC;
code = insn[0] & 3;
if (code == 2 && symval/scale <= 255)
{
unsigned int newrel = ELF32_R_TYPE (srel->r_info);
insn[0] &= 0xfc;
insn[0] |= 0x01;
newrel = next_smaller_reloc (ELF32_R_TYPE (srel->r_info));
if (newrel != ELF32_R_TYPE (srel->r_info))
{
SNIP (3, 1, newrel);
*again = true;
}
}
else if (code == 1 && symval == 0)
{
insn[0] &= 0xfc;
SNIP (2, 1, R_RX_NONE);
*again = true;
}
/* Special case DSP:5 format: MOV.bwl dsp:5[Rsrc],Rdst. */
else if (code == 1 && symval/scale <= 31
/* Decodable bits. */
&& (insn[0] & 0xcc) == 0xcc
/* Width. */
&& (insn[0] & 0x30) != 0x30
/* Register MSBs. */
&& (insn[1] & 0x88) == 0x00)
{
int newrel = 0;
insn[0] = 0x88 | (insn[0] & 0x30);
/* The register fields are in the right place already. */
/* We can't relax this new opcode. */
irel->r_addend = 0;
switch ((insn[0] & 0x30) >> 4)
{
case 0:
newrel = R_RX_RH_ABS5p5B;
break;
case 1:
newrel = R_RX_RH_ABS5p5W;
break;
case 2:
newrel = R_RX_RH_ABS5p5L;
break;
}
move_reloc (irel, srel, -2);
SNIP (2, 1, newrel);
}
/* Special case DSP:5 format: MOVU.bw dsp:5[Rsrc],Rdst. */
else if (code == 1 && symval/scale <= 31
/* Decodable bits. */
&& (insn[0] & 0xf8) == 0x58
/* Register MSBs. */
&& (insn[1] & 0x88) == 0x00)
{
int newrel = 0;
insn[0] = 0xb0 | ((insn[0] & 0x04) << 1);
/* The register fields are in the right place already. */
/* We can't relax this new opcode. */
irel->r_addend = 0;
switch ((insn[0] & 0x08) >> 3)
{
case 0:
newrel = R_RX_RH_ABS5p5B;
break;
case 1:
newrel = R_RX_RH_ABS5p5W;
break;
}
move_reloc (irel, srel, -2);
SNIP (2, 1, newrel);
}
}
/* A DSP4 operand always follows a DSP6 operand, even if there's
no relocation for it. We have to read the code out of the
opcode to calculate the offset of the operand. */
if (irel->r_addend & RX_RELAXA_DSP4)
{
int code6, offset = 0;
GET_RELOC;
code6 = insn[0] & 0x03;
switch (code6)
{
case 0: offset = 2; break;
case 1: offset = 3; break;
case 2: offset = 4; break;
case 3: offset = 2; break;
}
code = (insn[0] & 0x0c) >> 2;
if (code == 2 && symval / scale <= 255)
{
unsigned int newrel = ELF32_R_TYPE (srel->r_info);
insn[0] &= 0xf3;
insn[0] |= 0x04;
newrel = next_smaller_reloc (ELF32_R_TYPE (srel->r_info));
if (newrel != ELF32_R_TYPE (srel->r_info))
{
SNIP (offset+1, 1, newrel);
*again = true;
}
}
else if (code == 1 && symval == 0)
{
insn[0] &= 0xf3;
SNIP (offset, 1, R_RX_NONE);
*again = true;
}
/* Special case DSP:5 format: MOV.bwl Rsrc,dsp:5[Rdst] */
else if (code == 1 && symval/scale <= 31
/* Decodable bits. */
&& (insn[0] & 0xc3) == 0xc3
/* Width. */
&& (insn[0] & 0x30) != 0x30
/* Register MSBs. */
&& (insn[1] & 0x88) == 0x00)
{
int newrel = 0;
insn[0] = 0x80 | (insn[0] & 0x30);
/* The register fields are in the right place already. */
/* We can't relax this new opcode. */
irel->r_addend = 0;
switch ((insn[0] & 0x30) >> 4)
{
case 0:
newrel = R_RX_RH_ABS5p5B;
break;
case 1:
newrel = R_RX_RH_ABS5p5W;
break;
case 2:
newrel = R_RX_RH_ABS5p5L;
break;
}
move_reloc (irel, srel, -2);
SNIP (2, 1, newrel);
}
}
/* These always occur alone, but the offset depends on whether
it's a MEMEX opcode (0x06) or not. */
if (irel->r_addend & RX_RELAXA_DSP14)
{
int offset;
GET_RELOC;
if (insn[0] == 0x06)
offset = 3;
else
offset = 4;
code = insn[1] & 3;
if (code == 2 && symval / scale <= 255)
{
unsigned int newrel = ELF32_R_TYPE (srel->r_info);
insn[1] &= 0xfc;
insn[1] |= 0x01;
newrel = next_smaller_reloc (ELF32_R_TYPE (srel->r_info));
if (newrel != ELF32_R_TYPE (srel->r_info))
{
SNIP (offset, 1, newrel);
*again = true;
}
}
else if (code == 1 && symval == 0)
{
insn[1] &= 0xfc;
SNIP (offset, 1, R_RX_NONE);
*again = true;
}
}
/* IMM* codes:
0 00 imm:32
1 01 simm:8
2 10 simm:16
3 11 simm:24. */
/* These always occur alone. */
if (irel->r_addend & RX_RELAXA_IMM6)
{
long ssymval;
GET_RELOC;
/* These relocations sign-extend, so we must do signed compares. */
ssymval = (long) symval;
code = insn[0] & 0x03;
if (code == 0 && ssymval <= 8388607 && ssymval >= -8388608)
{
unsigned int newrel = ELF32_R_TYPE (srel->r_info);
insn[0] &= 0xfc;
insn[0] |= 0x03;
newrel = next_smaller_reloc (ELF32_R_TYPE (srel->r_info));
if (newrel != ELF32_R_TYPE (srel->r_info))
{
SNIP (2, 1, newrel);
*again = true;
}
}
else if (code == 3 && ssymval <= 32767 && ssymval >= -32768)
{
unsigned int newrel = ELF32_R_TYPE (srel->r_info);
insn[0] &= 0xfc;
insn[0] |= 0x02;
newrel = next_smaller_reloc (ELF32_R_TYPE (srel->r_info));
if (newrel != ELF32_R_TYPE (srel->r_info))
{
SNIP (2, 1, newrel);
*again = true;
}
}
/* Special case UIMM8 format: CMP #uimm8,Rdst. */
else if (code == 2 && ssymval <= 255 && ssymval >= 16
/* Decodable bits. */
&& (insn[0] & 0xfc) == 0x74
/* Decodable bits. */
&& ((insn[1] & 0xf0) == 0x00))
{
int newrel;
insn[0] = 0x75;
insn[1] = 0x50 | (insn[1] & 0x0f);
/* We can't relax this new opcode. */
irel->r_addend = 0;
if (STACK_REL_P (ELF32_R_TYPE (srel->r_info)))
newrel = R_RX_ABS8U;
else
newrel = R_RX_DIR8U;
SNIP (2, 1, newrel);
*again = true;
}
else if (code == 2 && ssymval <= 127 && ssymval >= -128)
{
unsigned int newrel = ELF32_R_TYPE (srel->r_info);
insn[0] &= 0xfc;
insn[0] |= 0x01;
newrel = next_smaller_reloc (ELF32_R_TYPE (srel->r_info));
if (newrel != ELF32_R_TYPE (srel->r_info))
{
SNIP (2, 1, newrel);
*again = true;
}
}
/* Special case UIMM4 format: CMP, MUL, AND, OR. */
else if (code == 1 && ssymval <= 15 && ssymval >= 0
/* Decodable bits and immediate type. */
&& insn[0] == 0x75
/* Decodable bits. */
&& (insn[1] & 0xc0) == 0x00)
{
static const int newop[4] = { 1, 3, 4, 5 };
insn[0] = 0x60 | newop[insn[1] >> 4];
/* The register number doesn't move. */
/* We can't relax this new opcode. */
irel->r_addend = 0;
move_reloc (irel, srel, -1);
SNIP (2, 1, R_RX_RH_UIMM4p8);
*again = true;
}
/* Special case UIMM4 format: ADD -> ADD/SUB. */
else if (code == 1 && ssymval <= 15 && ssymval >= -15
/* Decodable bits and immediate type. */
&& insn[0] == 0x71
/* Same register for source and destination. */
&& ((insn[1] >> 4) == (insn[1] & 0x0f)))
{
int newrel;
/* Note that we can't turn "add $0,Rs" into a NOP
because the flags need to be set right. */
if (ssymval < 0)
{
insn[0] = 0x60; /* Subtract. */
newrel = R_RX_RH_UNEG4p8;
}
else
{
insn[0] = 0x62; /* Add. */
newrel = R_RX_RH_UIMM4p8;
}
/* The register number is in the right place. */
/* We can't relax this new opcode. */
irel->r_addend = 0;
move_reloc (irel, srel, -1);
SNIP (2, 1, newrel);
*again = true;
}
}
/* These are either matched with a DSP6 (2-byte base) or an id24
(3-byte base). */
if (irel->r_addend & RX_RELAXA_IMM12)
{
int dspcode, offset = 0;
long ssymval;
GET_RELOC;
if ((insn[0] & 0xfc) == 0xfc)
dspcode = 1; /* Just something with one byte operand. */
else
dspcode = insn[0] & 3;
switch (dspcode)
{
case 0: offset = 2; break;
case 1: offset = 3; break;
case 2: offset = 4; break;
case 3: offset = 2; break;
}
/* These relocations sign-extend, so we must do signed compares. */
ssymval = (long) symval;
code = (insn[1] >> 2) & 3;
if (code == 0 && ssymval <= 8388607 && ssymval >= -8388608)
{
unsigned int newrel = ELF32_R_TYPE (srel->r_info);
insn[1] &= 0xf3;
insn[1] |= 0x0c;
newrel = next_smaller_reloc (ELF32_R_TYPE (srel->r_info));
if (newrel != ELF32_R_TYPE (srel->r_info))
{
SNIP (offset, 1, newrel);
*again = true;
}
}
else if (code == 3 && ssymval <= 32767 && ssymval >= -32768)
{
unsigned int newrel = ELF32_R_TYPE (srel->r_info);
insn[1] &= 0xf3;
insn[1] |= 0x08;
newrel = next_smaller_reloc (ELF32_R_TYPE (srel->r_info));
if (newrel != ELF32_R_TYPE (srel->r_info))
{
SNIP (offset, 1, newrel);
*again = true;
}
}
/* Special case UIMM8 format: MOV #uimm8,Rdst. */
else if (code == 2 && ssymval <= 255 && ssymval >= 16
/* Decodable bits. */
&& insn[0] == 0xfb
/* Decodable bits. */
&& ((insn[1] & 0x03) == 0x02))
{
int newrel;
insn[0] = 0x75;
insn[1] = 0x40 | (insn[1] >> 4);
/* We can't relax this new opcode. */
irel->r_addend = 0;
if (STACK_REL_P (ELF32_R_TYPE (srel->r_info)))
newrel = R_RX_ABS8U;
else
newrel = R_RX_DIR8U;
SNIP (2, 1, newrel);
*again = true;
}
else if (code == 2 && ssymval <= 127 && ssymval >= -128)
{
unsigned int newrel = ELF32_R_TYPE(srel->r_info);
insn[1] &= 0xf3;
insn[1] |= 0x04;
newrel = next_smaller_reloc (ELF32_R_TYPE (srel->r_info));
if (newrel != ELF32_R_TYPE(srel->r_info))
{
SNIP (offset, 1, newrel);
*again = true;
}
}
/* Special case UIMM4 format: MOV #uimm4,Rdst. */
else if (code == 1 && ssymval <= 15 && ssymval >= 0
/* Decodable bits. */
&& insn[0] == 0xfb
/* Decodable bits. */
&& ((insn[1] & 0x03) == 0x02))
{
insn[0] = 0x66;
insn[1] = insn[1] >> 4;
/* We can't relax this new opcode. */
irel->r_addend = 0;
move_reloc (irel, srel, -1);
SNIP (2, 1, R_RX_RH_UIMM4p8);
*again = true;
}
}
if (irel->r_addend & RX_RELAXA_BRA)
{
unsigned int newrel = ELF32_R_TYPE (srel->r_info);
int max_pcrel3 = 4;
int alignment_glue = 0;
GET_RELOC;
/* Branches over alignment chunks are problematic, as
deleting bytes here makes the branch *further* away. We
can be agressive with branches within this alignment
block, but not branches outside it. */
if ((prev_alignment == NULL
|| symval < (bfd_vma)(sec_start + prev_alignment->r_offset))
&& (next_alignment == NULL
|| symval > (bfd_vma)(sec_start + next_alignment->r_offset)))
alignment_glue = section_alignment_glue;
if (ELF32_R_TYPE(srel[1].r_info) == R_RX_RH_RELAX
&& srel[1].r_addend & RX_RELAXA_BRA
&& srel[1].r_offset < irel->r_offset + pcrel)
max_pcrel3 ++;
newrel = next_smaller_reloc (ELF32_R_TYPE (srel->r_info));
/* The values we compare PCREL with are not what you'd
expect; they're off by a little to compensate for (1)
where the reloc is relative to the insn, and (2) how much
the insn is going to change when we relax it. */
/* These we have to decode. */
switch (insn[0])
{
case 0x04: /* BRA pcdsp:24 */
if (-32768 + alignment_glue <= pcrel
&& pcrel <= 32765 - alignment_glue)
{
insn[0] = 0x38;
SNIP (3, 1, newrel);
*again = true;
}
break;
case 0x38: /* BRA pcdsp:16 */
if (-128 + alignment_glue <= pcrel
&& pcrel <= 127 - alignment_glue)
{
insn[0] = 0x2e;
SNIP (2, 1, newrel);
*again = true;
}
break;
case 0x2e: /* BRA pcdsp:8 */
/* Note that there's a risk here of shortening things so
much that we no longer fit this reloc; it *should*
only happen when you branch across a branch, and that
branch also devolves into BRA.S. "Real" code should
be OK. */
if (max_pcrel3 + alignment_glue <= pcrel
&& pcrel <= 10 - alignment_glue
&& allow_pcrel3)
{
insn[0] = 0x08;
SNIP (1, 1, newrel);
move_reloc (irel, srel, -1);
*again = true;
}
break;
case 0x05: /* BSR pcdsp:24 */
if (-32768 + alignment_glue <= pcrel
&& pcrel <= 32765 - alignment_glue)
{
insn[0] = 0x39;
SNIP (1, 1, newrel);
*again = true;
}
break;
case 0x3a: /* BEQ.W pcdsp:16 */
case 0x3b: /* BNE.W pcdsp:16 */
if (-128 + alignment_glue <= pcrel
&& pcrel <= 127 - alignment_glue)
{
insn[0] = 0x20 | (insn[0] & 1);
SNIP (1, 1, newrel);
*again = true;
}
break;
case 0x20: /* BEQ.B pcdsp:8 */
case 0x21: /* BNE.B pcdsp:8 */
if (max_pcrel3 + alignment_glue <= pcrel
&& pcrel - alignment_glue <= 10
&& allow_pcrel3)
{
insn[0] = 0x10 | ((insn[0] & 1) << 3);
SNIP (1, 1, newrel);
move_reloc (irel, srel, -1);
*again = true;
}
break;
case 0x16: /* synthetic BNE dsp24 */
case 0x1e: /* synthetic BEQ dsp24 */
if (-32767 + alignment_glue <= pcrel
&& pcrel <= 32766 - alignment_glue
&& insn[1] == 0x04)
{
if (insn[0] == 0x16)
insn[0] = 0x3b;
else
insn[0] = 0x3a;
/* We snip out the bytes at the end else the reloc
will get moved too, and too much. */
SNIP (3, 2, newrel);
move_reloc (irel, srel, -1);
*again = true;
}
break;
}
/* Special case - synthetic conditional branches, pcrel24.
Note that EQ and NE have been handled above. */
if ((insn[0] & 0xf0) == 0x20
&& insn[1] == 0x06
&& insn[2] == 0x04
&& srel->r_offset != irel->r_offset + 1
&& -32767 + alignment_glue <= pcrel
&& pcrel <= 32766 - alignment_glue)
{
insn[1] = 0x05;
insn[2] = 0x38;
SNIP (5, 1, newrel);
*again = true;
}
/* Special case - synthetic conditional branches, pcrel16 */
if ((insn[0] & 0xf0) == 0x20
&& insn[1] == 0x05
&& insn[2] == 0x38
&& srel->r_offset != irel->r_offset + 1
&& -127 + alignment_glue <= pcrel
&& pcrel <= 126 - alignment_glue)
{
int cond = (insn[0] & 0x0f) ^ 0x01;
insn[0] = 0x20 | cond;
/* By moving the reloc first, we avoid having
delete_bytes move it also. */
move_reloc (irel, srel, -2);
SNIP (2, 3, newrel);
*again = true;
}
}
BFD_ASSERT (nrelocs == 0);
/* Special case - check MOV.bwl #IMM, dsp[reg] and see if we can
use MOV.bwl #uimm:8, dsp:5[r7] format. This is tricky
because it may have one or two relocations. */
if ((insn[0] & 0xfc) == 0xf8
&& (insn[1] & 0x80) == 0x00
&& (insn[0] & 0x03) != 0x03)
{
int dcode, icode, reg, ioff, dscale, ilen;
bfd_vma disp_val = 0;
long imm_val = 0;
Elf_Internal_Rela * disp_rel = 0;
Elf_Internal_Rela * imm_rel = 0;
/* Reset this. */
srel = irel;
dcode = insn[0] & 0x03;
icode = (insn[1] >> 2) & 0x03;
reg = (insn[1] >> 4) & 0x0f;
ioff = dcode == 1 ? 3 : dcode == 2 ? 4 : 2;
/* Figure out what the dispacement is. */
if (dcode == 1 || dcode == 2)
{
/* There's a displacement. See if there's a reloc for it. */
if (srel[1].r_offset == irel->r_offset + 2)
{
GET_RELOC;
disp_val = symval;
disp_rel = srel;
}
else
{
if (dcode == 1)
disp_val = insn[2];
else
{
#if RX_OPCODE_BIG_ENDIAN
disp_val = insn[2] * 256 + insn[3];
#else
disp_val = insn[2] + insn[3] * 256;
#endif
}
switch (insn[1] & 3)
{
case 1:
disp_val *= 2;
scale = 2;
break;
case 2:
disp_val *= 4;
scale = 4;
break;
}
}
}
dscale = scale;
/* Figure out what the immediate is. */
if (srel[1].r_offset == irel->r_offset + ioff)
{
GET_RELOC;
imm_val = (long) symval;
imm_rel = srel;
}
else
{
unsigned char * ip = insn + ioff;
switch (icode)
{
case 1:
/* For byte writes, we don't sign extend. Makes the math easier later. */
if (scale == 1)
imm_val = ip[0];
else
imm_val = (char) ip[0];
break;
case 2:
#if RX_OPCODE_BIG_ENDIAN
imm_val = ((char) ip[0] << 8) | ip[1];
#else
imm_val = ((char) ip[1] << 8) | ip[0];
#endif
break;
case 3:
#if RX_OPCODE_BIG_ENDIAN
imm_val = ((char) ip[0] << 16) | (ip[1] << 8) | ip[2];
#else
imm_val = ((char) ip[2] << 16) | (ip[1] << 8) | ip[0];
#endif
break;
case 0:
#if RX_OPCODE_BIG_ENDIAN
imm_val = ((unsigned) ip[0] << 24) | (ip[1] << 16) | (ip[2] << 8) | ip[3];
#else
imm_val = ((unsigned) ip[3] << 24) | (ip[2] << 16) | (ip[1] << 8) | ip[0];
#endif
break;
}
}
ilen = 2;
switch (dcode)
{
case 1:
ilen += 1;
break;
case 2:
ilen += 2;
break;
}
switch (icode)
{
case 1:
ilen += 1;
break;
case 2:
ilen += 2;
break;
case 3:
ilen += 3;
break;
case 4:
ilen += 4;
break;
}
/* The shortcut happens when the immediate is 0..255,
register r0 to r7, and displacement (scaled) 0..31. */
if (0 <= imm_val && imm_val <= 255
&& 0 <= reg && reg <= 7
&& disp_val / dscale <= 31)
{
insn[0] = 0x3c | (insn[1] & 0x03);
insn[1] = (((disp_val / dscale) << 3) & 0x80) | (reg << 4) | ((disp_val/dscale) & 0x0f);
insn[2] = imm_val;
if (disp_rel)
{
int newrel = R_RX_NONE;
switch (dscale)
{
case 1:
newrel = R_RX_RH_ABS5p8B;
break;