395 lines
11 KiB
C
395 lines
11 KiB
C
/* MIPS ELF support for BFD.
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Copyright (C) 1993, 1994 Free Software Foundation, Inc.
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By Ian Lance Taylor, Cygnus Support, <ian@cygnus.com>, from
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information in the System V Application Binary Interface, MIPS
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Processor Supplement.
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* This file holds definitions specific to the MIPS ELF ABI. Note
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that most of this is not actually implemented by BFD. */
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#ifndef _ELF_MIPS_H
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#define _ELF_MIPS_H
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/* Processor specific flags for the ELF header e_flags field. */
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/* At least one .noreorder directive appears in the source. */
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#define EF_MIPS_NOREORDER 0x00000001
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/* File contains position independent code. */
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#define EF_MIPS_PIC 0x00000002
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/* Code in file uses the standard calling sequence for calling
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position independent code. */
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#define EF_MIPS_CPIC 0x00000004
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/* Four bit MIPS architecture field. */
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#define EF_MIPS_ARCH 0xf0000000
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/* -mips1 code. */
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#define E_MIPS_ARCH_1 0x00000000
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/* -mips2 code. */
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#define E_MIPS_ARCH_2 0x10000000
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/* -mips3 code. */
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#define E_MIPS_ARCH_3 0x20000000
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/* -mips4 code. */
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#define E_MIPS_ARCH_4 0x30000000
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/* Processor specific section indices. These sections do not actually
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exist. Symbols with a st_shndx field corresponding to one of these
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values have a special meaning. */
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/* Defined and allocated common symbol. Value is virtual address. If
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relocated, alignment must be preserved. */
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#define SHN_MIPS_ACOMMON 0xff00
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/* Defined and allocated text symbol. Value is virtual address.
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Occur in the dynamic symbol table of Alpha OSF/1 and Irix 5 executables. */
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#define SHN_MIPS_TEXT 0xff01
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/* Defined and allocated data symbol. Value is virtual address.
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Occur in the dynamic symbol table of Alpha OSF/1 and Irix 5 executables. */
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#define SHN_MIPS_DATA 0xff02
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/* Small common symbol. */
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#define SHN_MIPS_SCOMMON 0xff03
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/* Small undefined symbol. */
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#define SHN_MIPS_SUNDEFINED 0xff04
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/* Processor specific section types. */
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/* Section contains the set of dynamic shared objects used when
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statically linking. */
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#define SHT_MIPS_LIBLIST 0x70000000
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/* I'm not sure what this is, but it's used on Irix 5. */
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#define SHT_MIPS_MSYM 0x70000001
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/* Section contains list of symbols whose definitions conflict with
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symbols defined in shared objects. */
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#define SHT_MIPS_CONFLICT 0x70000002
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/* Section contains the global pointer table. */
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#define SHT_MIPS_GPTAB 0x70000003
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/* Section contains microcode information. The exact format is
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unspecified. */
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#define SHT_MIPS_UCODE 0x70000004
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/* Section contains some sort of debugging information. The exact
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format is unspecified. It's probably ECOFF symbols. */
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#define SHT_MIPS_DEBUG 0x70000005
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/* Section contains register usage information. */
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#define SHT_MIPS_REGINFO 0x70000006
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/* Section contains miscellaneous options (used on Irix). */
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#define SHT_MIPS_OPTIONS 0x7000000d
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/* DWARF debugging section (used on Irix 6). */
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#define SHT_MIPS_DWARF 0x7000001e
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/* Events section. This appears on Irix 6. I don't know what it
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means. */
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#define SHT_MIPS_EVENTS 0x70000021
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/* A section of type SHT_MIPS_LIBLIST contains an array of the
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following structure. The sh_link field is the section index of the
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string table. The sh_info field is the number of entries in the
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section. */
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typedef struct
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{
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/* String table index for name of shared object. */
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unsigned long l_name;
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/* Time stamp. */
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unsigned long l_time_stamp;
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/* Checksum of symbol names and common sizes. */
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unsigned long l_checksum;
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/* String table index for version. */
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unsigned long l_version;
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/* Flags. */
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unsigned long l_flags;
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} Elf32_Lib;
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/* The l_flags field of an Elf32_Lib structure may contain the
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following flags. */
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/* Require an exact match at runtime. */
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#define LL_EXACT_MATCH 0x00000001
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/* Ignore version incompatibilities at runtime. */
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#define LL_IGNORE_INT_VER 0x00000002
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/* A section of type SHT_MIPS_CONFLICT is an array of indices into the
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.dynsym section. Each element has the following type. */
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typedef unsigned long Elf32_Conflict;
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/* A section of type SHT_MIPS_GPTAB contains information about how
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much GP space would be required for different -G arguments. This
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information is only used so that the linker can provide informative
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suggestions as to the best -G value to use. The sh_info field is
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the index of the section for which this information applies. The
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contents of the section are an array of the following union. The
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first element uses the gt_header field. The remaining elements use
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the gt_entry field. */
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typedef union
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{
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struct
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{
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/* -G value actually used for this object file. */
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unsigned long gt_current_g_value;
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/* Unused. */
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unsigned long gt_unused;
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} gt_header;
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struct
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{
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/* If this -G argument has been used... */
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unsigned long gt_g_value;
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/* ...this many GP section bytes would be required. */
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unsigned long gt_bytes;
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} gt_entry;
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} Elf32_gptab;
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/* The external version of Elf32_gptab. */
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typedef union
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{
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struct
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{
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unsigned char gt_current_g_value[4];
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unsigned char gt_unused[4];
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} gt_header;
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struct
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{
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unsigned char gt_g_value[4];
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unsigned char gt_bytes[4];
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} gt_entry;
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} Elf32_External_gptab;
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/* A section of type SHT_MIPS_REGINFO contains the following
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structure. */
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typedef struct
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{
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/* Mask of general purpose registers used. */
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unsigned long ri_gprmask;
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/* Mask of co-processor registers used. */
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unsigned long ri_cprmask[4];
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/* GP register value for this object file. */
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long ri_gp_value;
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} Elf32_RegInfo;
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/* The external version of the Elf_RegInfo structure. */
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typedef struct
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{
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unsigned char ri_gprmask[4];
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unsigned char ri_cprmask[4][4];
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unsigned char ri_gp_value[4];
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} Elf32_External_RegInfo;
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/* MIPS ELF .reginfo swapping routines. */
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extern void bfd_mips_elf32_swap_reginfo_in
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PARAMS ((bfd *, const Elf32_External_RegInfo *, Elf32_RegInfo *));
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extern void bfd_mips_elf32_swap_reginfo_out
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PARAMS ((bfd *, const Elf32_RegInfo *, Elf32_External_RegInfo *));
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/* Processor specific section flags. */
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/* This section must be in the global data area. */
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#define SHF_MIPS_GPREL 0x10000000
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/* Processor specific program header types. */
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/* Register usage information. Identifies one .reginfo section. */
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#define PT_MIPS_REGINFO 0x70000000
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/* Runtime procedure table. */
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#define PT_MIPS_RTPROC 0x70000001
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/* Processor specific dynamic array tags. */
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/* 32 bit version number for runtime linker interface. */
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#define DT_MIPS_RLD_VERSION 0x70000001
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/* Time stamp. */
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#define DT_MIPS_TIME_STAMP 0x70000002
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/* Checksum of external strings and common sizes. */
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#define DT_MIPS_ICHECKSUM 0x70000003
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/* Index of version string in string table. */
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#define DT_MIPS_IVERSION 0x70000004
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/* 32 bits of flags. */
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#define DT_MIPS_FLAGS 0x70000005
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/* Base address of the segment. */
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#define DT_MIPS_BASE_ADDRESS 0x70000006
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/* Address of .conflict section. */
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#define DT_MIPS_CONFLICT 0x70000008
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/* Address of .liblist section. */
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#define DT_MIPS_LIBLIST 0x70000009
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/* Number of local global offset table entries. */
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#define DT_MIPS_LOCAL_GOTNO 0x7000000a
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/* Number of entries in the .conflict section. */
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#define DT_MIPS_CONFLICTNO 0x7000000b
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/* Number of entries in the .liblist section. */
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#define DT_MIPS_LIBLISTNO 0x70000010
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/* Number of entries in the .dynsym section. */
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#define DT_MIPS_SYMTABNO 0x70000011
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/* Index of first external dynamic symbol not referenced locally. */
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#define DT_MIPS_UNREFEXTNO 0x70000012
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/* Index of first dynamic symbol in global offset table. */
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#define DT_MIPS_GOTSYM 0x70000013
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/* Number of page table entries in global offset table. */
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#define DT_MIPS_HIPAGENO 0x70000014
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/* Address of run time loader map, used for debugging. */
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#define DT_MIPS_RLD_MAP 0x70000016
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/* Flags which may appear in a DT_MIPS_FLAGS entry. */
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/* No flags. */
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#define RHF_NONE 0x00000000
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/* Uses shortcut pointers. */
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#define RHF_QUICKSTART 0x00000001
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/* Hash size is not a power of two. */
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#define RHF_NOTPOT 0x00000002
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/* Ignore LD_LIBRARY_PATH. */
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#define RHS_NO_LIBRARY_REPLACEMENT \
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0x00000004
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/* Special values for the st_other field in the symbol table. These
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are used in an Irix 5 dynamic symbol table. */
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#define STO_DEFAULT 0x00
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#define STO_INTERNAL 0x01
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#define STO_HIDDEN 0x02
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#define STO_PROTECTED 0x03
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/* The 64-bit MIPS ELF ABI uses an usual reloc format. Each
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relocation entry specifies up to three actual relocations, all at
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the same address. The first relocation which required a symbol
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uses the symbol in the r_sym field. The second relocation which
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requires a symbol uses the symbol in the r_ssym field. If all
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three relocations require a symbol, the third one uses a zero
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value. */
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/* An entry in a 64 bit SHT_REL section. */
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typedef struct
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{
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/* Address of relocation. */
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unsigned char r_offset[8];
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/* Symbol index. */
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unsigned char r_sym[4];
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/* Special symbol. */
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unsigned char r_ssym[1];
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/* Third relocation. */
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unsigned char r_type3[1];
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/* Second relocation. */
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unsigned char r_type2[1];
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/* First relocation. */
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unsigned char r_type[1];
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} Elf64_Mips_External_Rel;
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typedef struct
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{
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/* Address of relocation. */
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bfd_vma r_offset;
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/* Symbol index. */
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unsigned long r_sym;
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/* Special symbol. */
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unsigned char r_ssym;
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/* Third relocation. */
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unsigned char r_type3;
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/* Second relocation. */
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unsigned char r_type2;
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/* First relocation. */
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unsigned char r_type;
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} Elf64_Mips_Internal_Rel;
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/* An entry in a 64 bit SHT_RELA section. */
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typedef struct
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{
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/* Address of relocation. */
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unsigned char r_offset[8];
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/* Symbol index. */
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unsigned char r_sym[4];
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/* Special symbol. */
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unsigned char r_ssym[1];
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/* Third relocation. */
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unsigned char r_type3[1];
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/* Second relocation. */
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unsigned char r_type2[1];
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/* First relocation. */
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unsigned char r_type[1];
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/* Addend. */
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unsigned char r_addend[8];
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} Elf64_Mips_External_Rela;
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typedef struct
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{
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/* Address of relocation. */
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bfd_vma r_offset;
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/* Symbol index. */
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unsigned long r_sym;
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/* Special symbol. */
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unsigned char r_ssym;
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/* Third relocation. */
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unsigned char r_type3;
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/* Second relocation. */
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unsigned char r_type2;
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/* First relocation. */
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unsigned char r_type;
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/* Addend. */
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bfd_signed_vma r_addend;
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} Elf64_Mips_Internal_Rela;
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/* Values found in the r_ssym field of a relocation entry. */
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/* No relocation. */
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#define RSS_UNDEF 0
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/* Value of GP. */
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#define RSS_GP 1
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/* Value of GP in object being relocated. */
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#define RSS_GP0 2
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/* Address of location being relocated. */
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#define RSS_LOC 3
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#endif /* _ELF_MIPS_H */
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