412 lines
14 KiB
C
412 lines
14 KiB
C
/* Generic ECOFF support.
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This does not include symbol information, found in sym.h and
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symconst.h.
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Copyright 2001, 2002, 2003, 2004, 2005, 2010 Free Software Foundation, Inc.
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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 3 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,
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MA 02110-1301, USA. */
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#ifndef ECOFF_H
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#define ECOFF_H
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/* Mips magic numbers used in filehdr. MIPS_MAGIC_LITTLE is used on
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little endian machines. MIPS_MAGIC_BIG is used on big endian
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machines. Where is MIPS_MAGIC_1 from? */
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#define MIPS_MAGIC_1 0x0180
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#define MIPS_MAGIC_LITTLE 0x0162
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#define MIPS_MAGIC_BIG 0x0160
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/* These are the magic numbers used for MIPS code compiled at ISA
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level 2. */
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#define MIPS_MAGIC_LITTLE2 0x0166
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#define MIPS_MAGIC_BIG2 0x0163
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/* These are the magic numbers used for MIPS code compiled at ISA
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level 3. */
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#define MIPS_MAGIC_LITTLE3 0x142
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#define MIPS_MAGIC_BIG3 0x140
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/* Alpha magic numbers used in filehdr. */
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#define ALPHA_MAGIC 0x183
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#define ALPHA_MAGIC_BSD 0x185
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/* A compressed version of an ALPHA_MAGIC file created by DEC's tools. */
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#define ALPHA_MAGIC_COMPRESSED 0x188
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/* Magic numbers used in a.out header. */
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#define ECOFF_AOUT_OMAGIC 0407 /* not demand paged (ld -N). */
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#define ECOFF_AOUT_ZMAGIC 0413 /* demand load format, eg normal ld output */
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/* Names of special sections. */
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#define _TEXT ".text"
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#define _DATA ".data"
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#define _BSS ".bss"
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#define _RDATA ".rdata"
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#define _SDATA ".sdata"
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#define _SBSS ".sbss"
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#define _LITA ".lita"
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#define _LIT4 ".lit4"
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#define _LIT8 ".lit8"
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#define _LIB ".lib"
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#define _INIT ".init"
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#define _FINI ".fini"
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#define _PDATA ".pdata"
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#define _XDATA ".xdata"
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#define _GOT ".got"
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#define _HASH ".hash"
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#define _DYNSYM ".dynsym"
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#define _DYNSTR ".dynstr"
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#define _RELDYN ".rel.dyn"
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#define _CONFLIC ".conflic"
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#define _COMMENT ".comment"
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#define _LIBLIST ".liblist"
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#define _DYNAMIC ".dynamic"
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#define _RCONST ".rconst"
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/* ECOFF uses some additional section flags. */
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#define STYP_RDATA 0x100
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#define STYP_SDATA 0x200
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#define STYP_SBSS 0x400
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#define STYP_GOT 0x1000
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#define STYP_DYNAMIC 0x2000
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#define STYP_DYNSYM 0x4000
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#define STYP_RELDYN 0x8000
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#define STYP_DYNSTR 0x10000
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#define STYP_HASH 0x20000
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#define STYP_LIBLIST 0x40000
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#define STYP_CONFLIC 0x100000
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#define STYP_ECOFF_FINI 0x1000000
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#define STYP_EXTENDESC 0x2000000 /* 0x02FFF000 bits => scn type, rest clr */
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#define STYP_LITA 0x4000000
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#define STYP_LIT8 0x8000000
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#define STYP_LIT4 0x10000000
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#define STYP_ECOFF_LIB 0x40000000
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#define STYP_ECOFF_INIT 0x80000000
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#define STYP_OTHER_LOAD (STYP_ECOFF_INIT | STYP_ECOFF_FINI)
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/* extended section types */
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#define STYP_COMMENT 0x2100000
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#define STYP_RCONST 0x2200000
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#define STYP_XDATA 0x2400000
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#define STYP_PDATA 0x2800000
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/* The linker needs a section to hold small common variables while
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linking. There is no convenient way to create it when the linker
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needs it, so we always create one for each BFD. We then avoid
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writing it out. */
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#define SCOMMON ".scommon"
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/* If the extern bit in a reloc is 1, then r_symndx is an index into
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the external symbol table. If the extern bit is 0, then r_symndx
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indicates a section, and is one of the following values. */
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#define RELOC_SECTION_NONE 0
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#define RELOC_SECTION_TEXT 1
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#define RELOC_SECTION_RDATA 2
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#define RELOC_SECTION_DATA 3
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#define RELOC_SECTION_SDATA 4
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#define RELOC_SECTION_SBSS 5
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#define RELOC_SECTION_BSS 6
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#define RELOC_SECTION_INIT 7
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#define RELOC_SECTION_LIT8 8
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#define RELOC_SECTION_LIT4 9
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#define RELOC_SECTION_XDATA 10
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#define RELOC_SECTION_PDATA 11
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#define RELOC_SECTION_FINI 12
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#define RELOC_SECTION_LITA 13
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#define RELOC_SECTION_ABS 14
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#define RELOC_SECTION_RCONST 15
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#define NUM_RELOC_SECTIONS 16
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/********************** STABS **********************/
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/* gcc uses mips-tfile to output type information in special stabs
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entries. These must match the corresponding definition in
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gcc/config/mips.h. At some point, these should probably go into a
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shared include file, but currently gcc and gdb do not share any
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directories. */
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#define CODE_MASK 0x8F300
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#define ECOFF_IS_STAB(sym) (((sym)->index & 0xFFF00) == CODE_MASK)
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#define ECOFF_MARK_STAB(code) ((code)+CODE_MASK)
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#define ECOFF_UNMARK_STAB(code) ((code)-CODE_MASK)
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#define STABS_SYMBOL "@stabs"
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/********************** COFF **********************/
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/* gcc also uses mips-tfile to output COFF debugging information.
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These are the values it uses when outputting the .type directive.
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These should also be in a shared include file. */
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#define N_BTMASK (017)
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#define N_TMASK (060)
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#define N_BTSHFT (4)
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#define N_TSHIFT (2)
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/********************** AUX **********************/
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/* The auxiliary type information is the same on all known ECOFF
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targets. I can't see any reason that it would ever change, so I am
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going to gamble and define the external structures here, in the
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target independent ECOFF header file. The internal forms are
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defined in coff/sym.h, which was originally donated by MIPS
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Computer Systems. */
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/* Type information external record */
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struct tir_ext {
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unsigned char t_bits1[1];
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unsigned char t_tq45[1];
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unsigned char t_tq01[1];
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unsigned char t_tq23[1];
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};
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#define TIR_BITS1_FBITFIELD_BIG ((unsigned int) 0x80)
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#define TIR_BITS1_FBITFIELD_LITTLE ((unsigned int) 0x01)
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#define TIR_BITS1_CONTINUED_BIG ((unsigned int) 0x40)
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#define TIR_BITS1_CONTINUED_LITTLE ((unsigned int) 0x02)
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#define TIR_BITS1_BT_BIG ((unsigned int) 0x3F)
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#define TIR_BITS1_BT_SH_BIG 0
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#define TIR_BITS1_BT_LITTLE ((unsigned int) 0xFC)
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#define TIR_BITS1_BT_SH_LITTLE 2
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#define TIR_BITS_TQ4_BIG ((unsigned int) 0xF0)
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#define TIR_BITS_TQ4_SH_BIG 4
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#define TIR_BITS_TQ5_BIG ((unsigned int) 0x0F)
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#define TIR_BITS_TQ5_SH_BIG 0
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#define TIR_BITS_TQ4_LITTLE ((unsigned int) 0x0F)
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#define TIR_BITS_TQ4_SH_LITTLE 0
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#define TIR_BITS_TQ5_LITTLE ((unsigned int) 0xF0)
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#define TIR_BITS_TQ5_SH_LITTLE 4
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#define TIR_BITS_TQ0_BIG ((unsigned int) 0xF0)
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#define TIR_BITS_TQ0_SH_BIG 4
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#define TIR_BITS_TQ1_BIG ((unsigned int) 0x0F)
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#define TIR_BITS_TQ1_SH_BIG 0
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#define TIR_BITS_TQ0_LITTLE ((unsigned int) 0x0F)
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#define TIR_BITS_TQ0_SH_LITTLE 0
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#define TIR_BITS_TQ1_LITTLE ((unsigned int) 0xF0)
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#define TIR_BITS_TQ1_SH_LITTLE 4
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#define TIR_BITS_TQ2_BIG ((unsigned int) 0xF0)
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#define TIR_BITS_TQ2_SH_BIG 4
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#define TIR_BITS_TQ3_BIG ((unsigned int) 0x0F)
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#define TIR_BITS_TQ3_SH_BIG 0
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#define TIR_BITS_TQ2_LITTLE ((unsigned int) 0x0F)
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#define TIR_BITS_TQ2_SH_LITTLE 0
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#define TIR_BITS_TQ3_LITTLE ((unsigned int) 0xF0)
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#define TIR_BITS_TQ3_SH_LITTLE 4
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/* Relative symbol external record */
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struct rndx_ext {
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unsigned char r_bits[4];
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};
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#define RNDX_BITS0_RFD_SH_LEFT_BIG 4
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#define RNDX_BITS1_RFD_BIG ((unsigned int) 0xF0)
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#define RNDX_BITS1_RFD_SH_BIG 4
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#define RNDX_BITS0_RFD_SH_LEFT_LITTLE 0
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#define RNDX_BITS1_RFD_LITTLE ((unsigned int) 0x0F)
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#define RNDX_BITS1_RFD_SH_LEFT_LITTLE 8
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#define RNDX_BITS1_INDEX_BIG ((unsigned int) 0x0F)
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#define RNDX_BITS1_INDEX_SH_LEFT_BIG 16
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#define RNDX_BITS2_INDEX_SH_LEFT_BIG 8
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#define RNDX_BITS3_INDEX_SH_LEFT_BIG 0
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#define RNDX_BITS1_INDEX_LITTLE ((unsigned int) 0xF0)
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#define RNDX_BITS1_INDEX_SH_LITTLE 4
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#define RNDX_BITS2_INDEX_SH_LEFT_LITTLE 4
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#define RNDX_BITS3_INDEX_SH_LEFT_LITTLE 12
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/* Auxiliary symbol information external record */
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union aux_ext {
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struct tir_ext a_ti;
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struct rndx_ext a_rndx;
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unsigned char a_dnLow[4];
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unsigned char a_dnHigh[4];
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unsigned char a_isym[4];
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unsigned char a_iss[4];
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unsigned char a_width[4];
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unsigned char a_count[4];
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};
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#define AUX_GET_ANY(bigend, ax, field) \
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((bigend) ? bfd_getb32 ((ax)->field) : bfd_getl32 ((ax)->field))
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#define AUX_GET_DNLOW(bigend, ax) AUX_GET_ANY ((bigend), (ax), a_dnLow)
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#define AUX_GET_DNHIGH(bigend, ax) AUX_GET_ANY ((bigend), (ax), a_dnHigh)
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#define AUX_GET_ISYM(bigend, ax) AUX_GET_ANY ((bigend), (ax), a_isym)
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#define AUX_GET_ISS(bigend, ax) AUX_GET_ANY ((bigend), (ax), a_iss)
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#define AUX_GET_WIDTH(bigend, ax) AUX_GET_ANY ((bigend), (ax), a_width)
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#define AUX_GET_COUNT(bigend, ax) AUX_GET_ANY ((bigend), (ax), a_count)
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#define AUX_PUT_ANY(bigend, val, ax, field) \
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((bigend) \
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? (bfd_putb32 ((bfd_vma) (val), (ax)->field), 0) \
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: (bfd_putl32 ((bfd_vma) (val), (ax)->field), 0))
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#define AUX_PUT_DNLOW(bigend, val, ax) \
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AUX_PUT_ANY ((bigend), (val), (ax), a_dnLow)
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#define AUX_PUT_DNHIGH(bigend, val, ax) \
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AUX_PUT_ANY ((bigend), (val), (ax), a_dnHigh)
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#define AUX_PUT_ISYM(bigend, val, ax) \
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AUX_PUT_ANY ((bigend), (val), (ax), a_isym)
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#define AUX_PUT_ISS(bigend, val, ax) \
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AUX_PUT_ANY ((bigend), (val), (ax), a_iss)
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#define AUX_PUT_WIDTH(bigend, val, ax) \
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AUX_PUT_ANY ((bigend), (val), (ax), a_width)
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#define AUX_PUT_COUNT(bigend, val, ax) \
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AUX_PUT_ANY ((bigend), (val), (ax), a_count)
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/********************** SYMBOLS **********************/
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/* For efficiency, gdb deals directly with the unswapped symbolic
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information (that way it only takes the time to swap information
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that it really needs to read). gdb originally retrieved the
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information directly from the BFD backend information, but that
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strategy, besides being sort of ugly, does not work for MIPS ELF,
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which also uses ECOFF debugging information. This structure holds
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pointers to the (mostly) unswapped symbolic information. */
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struct ecoff_debug_info
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{
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/* The swapped ECOFF symbolic header. */
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HDRR symbolic_header;
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/* Pointers to the unswapped symbolic information. Note that the
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pointers to external structures point to different sorts of
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information on different ECOFF targets. The ecoff_debug_swap
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structure provides the sizes of the structures and the functions
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needed to swap the information in and out. These pointers are
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all pointers to arrays, not single structures. They will be NULL
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if there are no instances of the relevant structure. These
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fields are also used by the assembler to output ECOFF debugging
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information. */
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unsigned char *line;
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void *external_dnr; /* struct dnr_ext */
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void *external_pdr; /* struct pdr_ext */
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void *external_sym; /* struct sym_ext */
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void *external_opt; /* struct opt_ext */
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union aux_ext *external_aux;
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char *ss;
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char *ssext;
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void *external_fdr; /* struct fdr_ext */
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void *external_rfd; /* struct rfd_ext */
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void *external_ext; /* struct ext_ext */
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/* These fields are used when linking. They may disappear at some
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point. */
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char *ssext_end;
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void *external_ext_end;
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/* When linking, this field holds a mapping from the input FDR
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numbers to the output numbers, and is used when writing out the
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external symbols. It is NULL if no mapping is required. */
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RFDT *ifdmap;
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/* The swapped FDR information. Currently this is never NULL, but
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code using this structure should probably double-check in case
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this changes in the future. This is a pointer to an array, not a
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single structure. */
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FDR *fdr;
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};
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/* These structures are used by the ECOFF find_nearest_line function. */
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struct ecoff_fdrtab_entry
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{
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/* Base address in .text of this FDR. */
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bfd_vma base_addr;
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FDR *fdr;
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};
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struct ecoff_find_line
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{
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/* Allocated memory to hold function and file names. */
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char *find_buffer;
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/* FDR table, sorted by address: */
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long fdrtab_len;
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struct ecoff_fdrtab_entry *fdrtab;
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/* Cache entry for most recently found line information. The sect
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field is NULL if this cache does not contain valid information. */
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struct
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{
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asection *sect;
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bfd_vma start;
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bfd_vma stop;
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const char *filename;
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const char *functionname;
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unsigned int line_num;
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} cache;
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};
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/********************** SWAPPING **********************/
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/* The generic ECOFF code needs to be able to swap debugging
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information in and out in the specific format used by a particular
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ECOFF implementation. This structure provides the information
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needed to do this. */
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struct ecoff_debug_swap
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{
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/* Symbol table magic number. */
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int sym_magic;
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/* Alignment of debugging information. E.g., 4. */
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bfd_size_type debug_align;
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/* Sizes of external symbolic information. */
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bfd_size_type external_hdr_size;
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bfd_size_type external_dnr_size;
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bfd_size_type external_pdr_size;
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bfd_size_type external_sym_size;
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bfd_size_type external_opt_size;
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bfd_size_type external_fdr_size;
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bfd_size_type external_rfd_size;
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bfd_size_type external_ext_size;
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/* Functions to swap in external symbolic data. */
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void (*swap_hdr_in) (bfd *, void *, HDRR *);
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void (*swap_dnr_in) (bfd *, void *, DNR *);
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void (*swap_pdr_in) (bfd *, void *, PDR *);
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void (*swap_sym_in) (bfd *, void *, SYMR *);
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void (*swap_opt_in) (bfd *, void *, OPTR *);
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void (*swap_fdr_in) (bfd *, void *, FDR *);
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void (*swap_rfd_in) (bfd *, void *, RFDT *);
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void (*swap_ext_in) (bfd *, void *, EXTR *);
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void (*swap_tir_in) (int, const struct tir_ext *, TIR *);
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void (*swap_rndx_in) (int, const struct rndx_ext *, RNDXR *);
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/* Functions to swap out external symbolic data. */
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void (*swap_hdr_out) (bfd *, const HDRR *, void *);
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void (*swap_dnr_out) (bfd *, const DNR *, void *);
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void (*swap_pdr_out) (bfd *, const PDR *, void *);
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void (*swap_sym_out) (bfd *, const SYMR *, void *);
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void (*swap_opt_out) (bfd *, const OPTR *, void *);
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void (*swap_fdr_out) (bfd *, const FDR *, void *);
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void (*swap_rfd_out) (bfd *, const RFDT *, void *);
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void (*swap_ext_out) (bfd *, const EXTR *, void *);
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void (*swap_tir_out) (int, const TIR *, struct tir_ext *);
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void (*swap_rndx_out) (int, const RNDXR *, struct rndx_ext *);
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/* Function to read symbol data and set up pointers in
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ecoff_debug_info structure. The section argument is used for
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ELF, not straight ECOFF. */
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bfd_boolean (*read_debug_info) (bfd *, asection *, struct ecoff_debug_info *);
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};
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#endif /* ! defined (ECOFF_H) */
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