201 lines
7.5 KiB
C
201 lines
7.5 KiB
C
/* Xtensa ELF support for BFD.
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Copyright 2003, 2004 Free Software Foundation, Inc.
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Contributed by Bob Wilson (bwilson@tensilica.com) at Tensilica.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,
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USA. */
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/* This file holds definitions specific to the Xtensa ELF ABI. */
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#ifndef _ELF_XTENSA_H
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#define _ELF_XTENSA_H
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#include "elf/reloc-macros.h"
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/* Relocations. */
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START_RELOC_NUMBERS (elf_xtensa_reloc_type)
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RELOC_NUMBER (R_XTENSA_NONE, 0)
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RELOC_NUMBER (R_XTENSA_32, 1)
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RELOC_NUMBER (R_XTENSA_RTLD, 2)
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RELOC_NUMBER (R_XTENSA_GLOB_DAT, 3)
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RELOC_NUMBER (R_XTENSA_JMP_SLOT, 4)
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RELOC_NUMBER (R_XTENSA_RELATIVE, 5)
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RELOC_NUMBER (R_XTENSA_PLT, 6)
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RELOC_NUMBER (R_XTENSA_OP0, 8)
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RELOC_NUMBER (R_XTENSA_OP1, 9)
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RELOC_NUMBER (R_XTENSA_OP2, 10)
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RELOC_NUMBER (R_XTENSA_ASM_EXPAND, 11)
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RELOC_NUMBER (R_XTENSA_ASM_SIMPLIFY, 12)
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RELOC_NUMBER (R_XTENSA_GNU_VTINHERIT, 15)
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RELOC_NUMBER (R_XTENSA_GNU_VTENTRY, 16)
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RELOC_NUMBER (R_XTENSA_DIFF8, 17)
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RELOC_NUMBER (R_XTENSA_DIFF16, 18)
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RELOC_NUMBER (R_XTENSA_DIFF32, 19)
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RELOC_NUMBER (R_XTENSA_SLOT0_OP, 20)
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RELOC_NUMBER (R_XTENSA_SLOT1_OP, 21)
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RELOC_NUMBER (R_XTENSA_SLOT2_OP, 22)
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RELOC_NUMBER (R_XTENSA_SLOT3_OP, 23)
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RELOC_NUMBER (R_XTENSA_SLOT4_OP, 24)
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RELOC_NUMBER (R_XTENSA_SLOT5_OP, 25)
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RELOC_NUMBER (R_XTENSA_SLOT6_OP, 26)
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RELOC_NUMBER (R_XTENSA_SLOT7_OP, 27)
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RELOC_NUMBER (R_XTENSA_SLOT8_OP, 28)
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RELOC_NUMBER (R_XTENSA_SLOT9_OP, 29)
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RELOC_NUMBER (R_XTENSA_SLOT10_OP, 30)
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RELOC_NUMBER (R_XTENSA_SLOT11_OP, 31)
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RELOC_NUMBER (R_XTENSA_SLOT12_OP, 32)
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RELOC_NUMBER (R_XTENSA_SLOT13_OP, 33)
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RELOC_NUMBER (R_XTENSA_SLOT14_OP, 34)
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RELOC_NUMBER (R_XTENSA_SLOT0_ALT, 35)
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RELOC_NUMBER (R_XTENSA_SLOT1_ALT, 36)
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RELOC_NUMBER (R_XTENSA_SLOT2_ALT, 37)
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RELOC_NUMBER (R_XTENSA_SLOT3_ALT, 38)
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RELOC_NUMBER (R_XTENSA_SLOT4_ALT, 39)
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RELOC_NUMBER (R_XTENSA_SLOT5_ALT, 40)
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RELOC_NUMBER (R_XTENSA_SLOT6_ALT, 41)
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RELOC_NUMBER (R_XTENSA_SLOT7_ALT, 42)
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RELOC_NUMBER (R_XTENSA_SLOT8_ALT, 43)
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RELOC_NUMBER (R_XTENSA_SLOT9_ALT, 44)
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RELOC_NUMBER (R_XTENSA_SLOT10_ALT, 45)
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RELOC_NUMBER (R_XTENSA_SLOT11_ALT, 46)
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RELOC_NUMBER (R_XTENSA_SLOT12_ALT, 47)
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RELOC_NUMBER (R_XTENSA_SLOT13_ALT, 48)
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RELOC_NUMBER (R_XTENSA_SLOT14_ALT, 49)
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END_RELOC_NUMBERS (R_XTENSA_max)
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/* Processor-specific flags for the ELF header e_flags field. */
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/* Four-bit Xtensa machine type field. */
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#define EF_XTENSA_MACH 0x0000000f
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/* Various CPU types. */
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#define E_XTENSA_MACH 0x00000000
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/* Leave bits 0xf0 alone in case we ever have more than 16 cpu types.
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Highly unlikely, but what the heck. */
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#define EF_XTENSA_XT_INSN 0x00000100
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#define EF_XTENSA_XT_LIT 0x00000200
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/* Processor-specific dynamic array tags. */
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/* Offset of the table that records the GOT location(s). */
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#define DT_XTENSA_GOT_LOC_OFF 0x70000000
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/* Number of entries in the GOT location table. */
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#define DT_XTENSA_GOT_LOC_SZ 0x70000001
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/* Definitions for instruction and literal property tables. The
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tables for ".gnu.linkonce.*" sections are placed in the following
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sections:
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instruction tables: .gnu.linkonce.x.*
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literal tables: .gnu.linkonce.p.*
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*/
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#define XTENSA_INSN_SEC_NAME ".xt.insn"
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#define XTENSA_LIT_SEC_NAME ".xt.lit"
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#define XTENSA_PROP_SEC_NAME ".xt.prop"
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typedef struct property_table_entry_t
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{
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bfd_vma address;
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bfd_vma size;
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flagword flags;
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} property_table_entry;
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/* Flags in the property tables to specify whether blocks of memory are
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literals, instructions, data, or unreachable. For instructions,
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blocks that begin loop targets and branch targets are designated.
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Blocks that do not allow density instructions, instruction reordering
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or transformation are also specified. Finally, for branch targets,
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branch target alignment priority is included. Alignment of the next
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block is specified in the current block and the size of the current
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block does not include any fill required to align to the next
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block. */
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#define XTENSA_PROP_LITERAL 0x00000001
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#define XTENSA_PROP_INSN 0x00000002
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#define XTENSA_PROP_DATA 0x00000004
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#define XTENSA_PROP_UNREACHABLE 0x00000008
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/* Instruction-only properties at beginning of code. */
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#define XTENSA_PROP_INSN_LOOP_TARGET 0x00000010
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#define XTENSA_PROP_INSN_BRANCH_TARGET 0x00000020
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/* Instruction-only properties about code. */
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#define XTENSA_PROP_INSN_NO_DENSITY 0x00000040
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#define XTENSA_PROP_INSN_NO_REORDER 0x00000080
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/* Historically, NO_TRANSFORM was a property of instructions,
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but it should apply to literals under certain circumstances. */
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#define XTENSA_PROP_NO_TRANSFORM 0x00000100
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/* Branch target alignment information. This transmits information
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to the linker optimization about the priority of aligning a
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particular block for branch target alignment: None, low priority,
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high priority, or required. These only need to be checked in
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instruction blocks marked as XTENSA_PROP_INSN_BRANCH_TARGET.
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Common usage is:
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switch (GET_XTENSA_PROP_BT_ALIGN(flags))
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case XTENSA_PROP_BT_ALIGN_NONE:
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case XTENSA_PROP_BT_ALIGN_LOW:
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case XTENSA_PROP_BT_ALIGN_HIGH:
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case XTENSA_PROP_BT_ALIGN_REQUIRE:
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*/
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#define XTENSA_PROP_BT_ALIGN_MASK 0x00000600
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/* No branch target alignment. */
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#define XTENSA_PROP_BT_ALIGN_NONE 0x0
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/* Low priority branch target alignment. */
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#define XTENSA_PROP_BT_ALIGN_LOW 0x1
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/* High priority branch target alignment. */
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#define XTENSA_PROP_BT_ALIGN_HIGH 0x2
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/* Required branch target alignment. */
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#define XTENSA_PROP_BT_ALIGN_REQUIRE 0x3
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#define GET_XTENSA_PROP_BT_ALIGN(flag) \
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(((unsigned)((flag) & (XTENSA_PROP_BT_ALIGN_MASK))) >> 9)
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#define SET_XTENSA_PROP_BT_ALIGN(flag, align) \
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(((flag) & (~XTENSA_PROP_BT_ALIGN_MASK)) | \
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(((align) << 9) & XTENSA_PROP_BT_ALIGN_MASK))
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/* Alignment is specified in the block BEFORE the one that needs
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alignment. Up to 5 bits. Use GET_XTENSA_PROP_ALIGNMENT(flags) to
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get the required alignment specified as a power of 2. Use
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SET_XTENSA_PROP_ALIGNMENT(flags, pow2) to set the required
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alignment. Be careful of side effects since the SET will evaluate
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flags twice. Also, note that the SIZE of a block in the property
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table does not include the alignment size, so the alignment fill
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must be calculated to determine if two blocks are contiguous.
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TEXT_ALIGN is not currently implemented but is a placeholder for a
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possible future implementation. */
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#define XTENSA_PROP_ALIGN 0x00000800
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#define XTENSA_PROP_ALIGNMENT_MASK 0x0001f000
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#define GET_XTENSA_PROP_ALIGNMENT(flag) \
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(((unsigned)((flag) & (XTENSA_PROP_ALIGNMENT_MASK))) >> 12)
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#define SET_XTENSA_PROP_ALIGNMENT(flag, align) \
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(((flag) & (~XTENSA_PROP_ALIGNMENT_MASK)) | \
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(((align) << 12) & XTENSA_PROP_ALIGNMENT_MASK))
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#define XTENSA_PROP_INSN_ABSLIT 0x00020000
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#endif /* _ELF_XTENSA_H */
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