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/* Xtensa ELF support for BFD.
Copyright (C) 2003-2021 Free Software Foundation, Inc.
Contributed by Bob Wilson (bwilson@tensilica.com) at Tensilica.
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. */
/* This file holds definitions specific to the Xtensa ELF ABI. */
#ifndef _ELF_XTENSA_H
#define _ELF_XTENSA_H
#include "elf/reloc-macros.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Relocations. */
START_RELOC_NUMBERS (elf_xtensa_reloc_type)
RELOC_NUMBER (R_XTENSA_NONE, 0)
RELOC_NUMBER (R_XTENSA_32, 1)
RELOC_NUMBER (R_XTENSA_RTLD, 2)
RELOC_NUMBER (R_XTENSA_GLOB_DAT, 3)
RELOC_NUMBER (R_XTENSA_JMP_SLOT, 4)
RELOC_NUMBER (R_XTENSA_RELATIVE, 5)
RELOC_NUMBER (R_XTENSA_PLT, 6)
RELOC_NUMBER (R_XTENSA_OP0, 8)
RELOC_NUMBER (R_XTENSA_OP1, 9)
RELOC_NUMBER (R_XTENSA_OP2, 10)
RELOC_NUMBER (R_XTENSA_ASM_EXPAND, 11)
RELOC_NUMBER (R_XTENSA_ASM_SIMPLIFY, 12)
RELOC_NUMBER (R_XTENSA_32_PCREL, 14)
RELOC_NUMBER (R_XTENSA_GNU_VTINHERIT, 15)
RELOC_NUMBER (R_XTENSA_GNU_VTENTRY, 16)
RELOC_NUMBER (R_XTENSA_DIFF8, 17)
RELOC_NUMBER (R_XTENSA_DIFF16, 18)
RELOC_NUMBER (R_XTENSA_DIFF32, 19)
RELOC_NUMBER (R_XTENSA_SLOT0_OP, 20)
RELOC_NUMBER (R_XTENSA_SLOT1_OP, 21)
RELOC_NUMBER (R_XTENSA_SLOT2_OP, 22)
RELOC_NUMBER (R_XTENSA_SLOT3_OP, 23)
RELOC_NUMBER (R_XTENSA_SLOT4_OP, 24)
RELOC_NUMBER (R_XTENSA_SLOT5_OP, 25)
RELOC_NUMBER (R_XTENSA_SLOT6_OP, 26)
RELOC_NUMBER (R_XTENSA_SLOT7_OP, 27)
RELOC_NUMBER (R_XTENSA_SLOT8_OP, 28)
RELOC_NUMBER (R_XTENSA_SLOT9_OP, 29)
RELOC_NUMBER (R_XTENSA_SLOT10_OP, 30)
RELOC_NUMBER (R_XTENSA_SLOT11_OP, 31)
RELOC_NUMBER (R_XTENSA_SLOT12_OP, 32)
RELOC_NUMBER (R_XTENSA_SLOT13_OP, 33)
RELOC_NUMBER (R_XTENSA_SLOT14_OP, 34)
RELOC_NUMBER (R_XTENSA_SLOT0_ALT, 35)
RELOC_NUMBER (R_XTENSA_SLOT1_ALT, 36)
RELOC_NUMBER (R_XTENSA_SLOT2_ALT, 37)
RELOC_NUMBER (R_XTENSA_SLOT3_ALT, 38)
RELOC_NUMBER (R_XTENSA_SLOT4_ALT, 39)
RELOC_NUMBER (R_XTENSA_SLOT5_ALT, 40)
RELOC_NUMBER (R_XTENSA_SLOT6_ALT, 41)
RELOC_NUMBER (R_XTENSA_SLOT7_ALT, 42)
RELOC_NUMBER (R_XTENSA_SLOT8_ALT, 43)
RELOC_NUMBER (R_XTENSA_SLOT9_ALT, 44)
RELOC_NUMBER (R_XTENSA_SLOT10_ALT, 45)
RELOC_NUMBER (R_XTENSA_SLOT11_ALT, 46)
RELOC_NUMBER (R_XTENSA_SLOT12_ALT, 47)
RELOC_NUMBER (R_XTENSA_SLOT13_ALT, 48)
RELOC_NUMBER (R_XTENSA_SLOT14_ALT, 49)
RELOC_NUMBER (R_XTENSA_TLSDESC_FN, 50)
RELOC_NUMBER (R_XTENSA_TLSDESC_ARG, 51)
RELOC_NUMBER (R_XTENSA_TLS_DTPOFF, 52)
RELOC_NUMBER (R_XTENSA_TLS_TPOFF, 53)
RELOC_NUMBER (R_XTENSA_TLS_FUNC, 54)
RELOC_NUMBER (R_XTENSA_TLS_ARG, 55)
RELOC_NUMBER (R_XTENSA_TLS_CALL, 56)
RELOC_NUMBER (R_XTENSA_PDIFF8, 57)
RELOC_NUMBER (R_XTENSA_PDIFF16, 58)
RELOC_NUMBER (R_XTENSA_PDIFF32, 59)
RELOC_NUMBER (R_XTENSA_NDIFF8, 60)
RELOC_NUMBER (R_XTENSA_NDIFF16, 61)
RELOC_NUMBER (R_XTENSA_NDIFF32, 62)
END_RELOC_NUMBERS (R_XTENSA_max)
/* Processor-specific flags for the ELF header e_flags field. */
/* Four-bit Xtensa machine type field. */
#define EF_XTENSA_MACH 0x0000000f
/* Various CPU types. */
#define E_XTENSA_MACH 0x00000000
/* Leave bits 0xf0 alone in case we ever have more than 16 cpu types.
Highly unlikely, but what the heck. */
#define EF_XTENSA_XT_INSN 0x00000100
#define EF_XTENSA_XT_LIT 0x00000200
/* Processor-specific dynamic array tags. */
/* Offset of the table that records the GOT location(s). */
#define DT_XTENSA_GOT_LOC_OFF 0x70000000
/* Number of entries in the GOT location table. */
#define DT_XTENSA_GOT_LOC_SZ 0x70000001
/* Definitions for instruction and literal property tables. The
tables for ".gnu.linkonce.*" sections are placed in the following
sections:
instruction tables: .gnu.linkonce.x.*
literal tables: .gnu.linkonce.p.*
*/
#define XTENSA_INSN_SEC_NAME ".xt.insn"
#define XTENSA_LIT_SEC_NAME ".xt.lit"
#define XTENSA_PROP_SEC_NAME ".xt.prop"
typedef struct property_table_entry_t
{
bfd_vma address;
bfd_vma size;
flagword flags;
} property_table_entry;
/* Flags in the property tables to specify whether blocks of memory are
literals, instructions, data, or unreachable. For instructions,
blocks that begin loop targets and branch targets are designated.
Blocks that do not allow density instructions, instruction reordering
or transformation are also specified. Finally, for branch targets,
branch target alignment priority is included. Alignment of the next
block is specified in the current block and the size of the current
block does not include any fill required to align to the next
block. */
#define XTENSA_PROP_LITERAL 0x00000001
#define XTENSA_PROP_INSN 0x00000002
#define XTENSA_PROP_DATA 0x00000004
#define XTENSA_PROP_UNREACHABLE 0x00000008
/* Instruction-only properties at beginning of code. */
#define XTENSA_PROP_INSN_LOOP_TARGET 0x00000010
#define XTENSA_PROP_INSN_BRANCH_TARGET 0x00000020
/* Instruction-only properties about code. */
#define XTENSA_PROP_INSN_NO_DENSITY 0x00000040
#define XTENSA_PROP_INSN_NO_REORDER 0x00000080
/* Historically, NO_TRANSFORM was a property of instructions,
but it should apply to literals under certain circumstances. */
#define XTENSA_PROP_NO_TRANSFORM 0x00000100
/* Branch target alignment information. This transmits information
to the linker optimization about the priority of aligning a
particular block for branch target alignment: None, low priority,
high priority, or required. These only need to be checked in
instruction blocks marked as XTENSA_PROP_INSN_BRANCH_TARGET.
Common usage is:
switch (GET_XTENSA_PROP_BT_ALIGN(flags))
case XTENSA_PROP_BT_ALIGN_NONE:
case XTENSA_PROP_BT_ALIGN_LOW:
case XTENSA_PROP_BT_ALIGN_HIGH:
case XTENSA_PROP_BT_ALIGN_REQUIRE:
*/
#define XTENSA_PROP_BT_ALIGN_MASK 0x00000600
/* No branch target alignment. */
#define XTENSA_PROP_BT_ALIGN_NONE 0x0
/* Low priority branch target alignment. */
#define XTENSA_PROP_BT_ALIGN_LOW 0x1
/* High priority branch target alignment. */
#define XTENSA_PROP_BT_ALIGN_HIGH 0x2
/* Required branch target alignment. */
#define XTENSA_PROP_BT_ALIGN_REQUIRE 0x3
#define GET_XTENSA_PROP_BT_ALIGN(flag) \
(((unsigned)((flag) & (XTENSA_PROP_BT_ALIGN_MASK))) >> 9)
#define SET_XTENSA_PROP_BT_ALIGN(flag, align) \
(((flag) & (~XTENSA_PROP_BT_ALIGN_MASK)) | \
(((align) << 9) & XTENSA_PROP_BT_ALIGN_MASK))
/* Alignment is specified in the block BEFORE the one that needs
alignment. Up to 5 bits. Use GET_XTENSA_PROP_ALIGNMENT(flags) to
get the required alignment specified as a power of 2. Use
SET_XTENSA_PROP_ALIGNMENT(flags, pow2) to set the required
alignment. Be careful of side effects since the SET will evaluate
flags twice. Also, note that the SIZE of a block in the property
table does not include the alignment size, so the alignment fill
must be calculated to determine if two blocks are contiguous.
TEXT_ALIGN is not currently implemented but is a placeholder for a
possible future implementation. */
#define XTENSA_PROP_ALIGN 0x00000800
#define XTENSA_PROP_ALIGNMENT_MASK 0x0001f000
#define GET_XTENSA_PROP_ALIGNMENT(flag) \
(((unsigned)((flag) & (XTENSA_PROP_ALIGNMENT_MASK))) >> 12)
#define SET_XTENSA_PROP_ALIGNMENT(flag, align) \
(((flag) & (~XTENSA_PROP_ALIGNMENT_MASK)) | \
(((align) << 12) & XTENSA_PROP_ALIGNMENT_MASK))
#define XTENSA_PROP_INSN_ABSLIT 0x00020000
extern asection *xtensa_make_property_section (asection *, const char *);
extern int
xtensa_read_table_entries (bfd *abfd,
asection *section,
property_table_entry **table_p,
const char *sec_name,
bfd_boolean output_addr);
extern int
xtensa_compute_fill_extra_space (property_table_entry *entry);
extern int
xtensa_abi_choice (void);
#ifdef __cplusplus
}
#endif
#endif /* _ELF_XTENSA_H */
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