/* ECOFF support on MIPS machines.
  coff/ecoff.h must be included before this file.

  Copyright (C) 1999-2024 Free Software Foundation, Inc.

  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.  */

#define DO_NOT_DEFINE_AOUTHDR
#define L_LNNO_SIZE 4
#include "coff/external.h"

/* Magic numbers are defined in coff/ecoff.h.  */
#define MIPS_ECOFF_BADMAG(x) (((x).f_magic!=MIPS_MAGIC_1) && \
                             ((x).f_magic!=MIPS_MAGIC_LITTLE) &&\
                             ((x).f_magic!=MIPS_MAGIC_BIG) && \
                             ((x).f_magic!=MIPS_MAGIC_LITTLE2) && \
                             ((x).f_magic!=MIPS_MAGIC_BIG2) && \
                             ((x).f_magic!=MIPS_MAGIC_LITTLE3) && \
                             ((x).f_magic!=MIPS_MAGIC_BIG3))


/********************** AOUT "OPTIONAL HEADER" **********************/

typedef struct external_aouthdr
{
 unsigned char magic[2];       /* type of file                         */
 unsigned char vstamp[2];      /* version stamp                        */
 unsigned char tsize[4];       /* text size in bytes, padded to FW bdry*/
 unsigned char dsize[4];       /* initialized data "  "                */
 unsigned char bsize[4];       /* uninitialized data "   "             */
 unsigned char entry[4];       /* entry pt.                            */
 unsigned char text_start[4];  /* base of text used for this file */
 unsigned char data_start[4];  /* base of data used for this file */
 unsigned char bss_start[4];   /* base of bss used for this file */
 unsigned char gprmask[4];     /* ?? */
 unsigned char cprmask[4][4];  /* ?? */
 unsigned char gp_value[4];    /* value for gp register */
} AOUTHDR;

/* compute size of a header */

#define AOUTSZ 56
#define AOUTHDRSZ 56

/********************** RELOCATION DIRECTIVES **********************/

struct external_reloc
 {
   unsigned char r_vaddr[4];
   unsigned char r_bits[4];
 };

#define RELOC struct external_reloc
#define RELSZ 8

/* MIPS ECOFF uses a packed 8 byte format for relocs.  These constants
  are used to unpack the r_bits field.  */

#define RELOC_BITS0_SYMNDX_SH_LEFT_BIG          16
#define RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE       0

#define RELOC_BITS1_SYMNDX_SH_LEFT_BIG          8
#define RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE       8

#define RELOC_BITS2_SYMNDX_SH_LEFT_BIG          0
#define RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE       16

/* Originally, ECOFF used four bits for the reloc type and had three
  reserved bits.  Irix 4 added another bit for the reloc type, which
  was easy because it was big endian and one of the spare bits became
  the new most significant bit.  To make this also work for little
  endian ECOFF, we need to wrap one of the reserved bits around to
  become the most significant bit of the reloc type.  */
#define RELOC_BITS3_TYPE_BIG                    0x3E
#define RELOC_BITS3_TYPE_SH_BIG                 1
#define RELOC_BITS3_TYPE_LITTLE                 0x78
#define RELOC_BITS3_TYPE_SH_LITTLE              3
#define RELOC_BITS3_TYPEHI_LITTLE               0x04
#define RELOC_BITS3_TYPEHI_SH_LITTLE            2

#define RELOC_BITS3_EXTERN_BIG                  0x01
#define RELOC_BITS3_EXTERN_LITTLE               0x80

/* The r_type field in a reloc is one of the following values.  I
  don't know if any other values can appear.  These seem to be all
  that occur in the Ultrix 4.2 libraries.  */
#define MIPS_R_IGNORE   0
#define MIPS_R_REFHALF  1
#define MIPS_R_REFWORD  2
#define MIPS_R_JMPADDR  3
#define MIPS_R_REFHI    4
#define MIPS_R_REFLO    5
#define MIPS_R_GPREL    6
#define MIPS_R_LITERAL  7

/* FIXME: This relocation is used (internally only) to represent branches
  when assembling.  It should never appear in output files, and
  be removed.  (It used to be used for embedded-PIC support.)  */
#define MIPS_R_PCREL16  12

/********************** STABS **********************/

#define MIPS_IS_STAB ECOFF_IS_STAB
#define MIPS_MARK_STAB ECOFF_MARK_STAB
#define MIPS_UNMARK_STAB ECOFF_UNMARK_STAB

/********************** SYMBOLIC INFORMATION **********************/

/* Written by John Gilmore.  */

/* ECOFF uses COFF-like section structures, but its own symbol format.
  This file defines the symbol format in fields whose size and alignment
  will not vary on different host systems.  */

/* File header as a set of bytes */

struct hdr_ext
{
       unsigned char   h_magic[2];
       unsigned char   h_vstamp[2];
       unsigned char   h_ilineMax[4];
       unsigned char   h_cbLine[4];
       unsigned char   h_cbLineOffset[4];
       unsigned char   h_idnMax[4];
       unsigned char   h_cbDnOffset[4];
       unsigned char   h_ipdMax[4];
       unsigned char   h_cbPdOffset[4];
       unsigned char   h_isymMax[4];
       unsigned char   h_cbSymOffset[4];
       unsigned char   h_ioptMax[4];
       unsigned char   h_cbOptOffset[4];
       unsigned char   h_iauxMax[4];
       unsigned char   h_cbAuxOffset[4];
       unsigned char   h_issMax[4];
       unsigned char   h_cbSsOffset[4];
       unsigned char   h_issExtMax[4];
       unsigned char   h_cbSsExtOffset[4];
       unsigned char   h_ifdMax[4];
       unsigned char   h_cbFdOffset[4];
       unsigned char   h_crfd[4];
       unsigned char   h_cbRfdOffset[4];
       unsigned char   h_iextMax[4];
       unsigned char   h_cbExtOffset[4];
};

/* File descriptor external record */

struct fdr_ext
{
       unsigned char   f_adr[4];
       unsigned char   f_rss[4];
       unsigned char   f_issBase[4];
       unsigned char   f_cbSs[4];
       unsigned char   f_isymBase[4];
       unsigned char   f_csym[4];
       unsigned char   f_ilineBase[4];
       unsigned char   f_cline[4];
       unsigned char   f_ioptBase[4];
       unsigned char   f_copt[4];
       unsigned char   f_ipdFirst[2];
       unsigned char   f_cpd[2];
       unsigned char   f_iauxBase[4];
       unsigned char   f_caux[4];
       unsigned char   f_rfdBase[4];
       unsigned char   f_crfd[4];
       unsigned char   f_bits1[1];
       unsigned char   f_bits2[3];
       unsigned char   f_cbLineOffset[4];
       unsigned char   f_cbLine[4];
};

#define FDR_BITS1_LANG_BIG              0xF8
#define FDR_BITS1_LANG_SH_BIG           3
#define FDR_BITS1_LANG_LITTLE           0x1F
#define FDR_BITS1_LANG_SH_LITTLE        0

#define FDR_BITS1_FMERGE_BIG            0x04
#define FDR_BITS1_FMERGE_LITTLE         0x20

#define FDR_BITS1_FREADIN_BIG           0x02
#define FDR_BITS1_FREADIN_LITTLE        0x40

#define FDR_BITS1_FBIGENDIAN_BIG        0x01
#define FDR_BITS1_FBIGENDIAN_LITTLE     0x80

#define FDR_BITS2_GLEVEL_BIG            0xC0
#define FDR_BITS2_GLEVEL_SH_BIG         6
#define FDR_BITS2_GLEVEL_LITTLE         0x03
#define FDR_BITS2_GLEVEL_SH_LITTLE      0

/* We ignore the `reserved' field in bits2. */

/* Procedure descriptor external record */

struct pdr_ext
{
       unsigned char   p_adr[4];
       unsigned char   p_isym[4];
       unsigned char   p_iline[4];
       unsigned char   p_regmask[4];
       unsigned char   p_regoffset[4];
       unsigned char   p_iopt[4];
       unsigned char   p_fregmask[4];
       unsigned char   p_fregoffset[4];
       unsigned char   p_frameoffset[4];
       unsigned char   p_framereg[2];
       unsigned char   p_pcreg[2];
       unsigned char   p_lnLow[4];
       unsigned char   p_lnHigh[4];
       unsigned char   p_cbLineOffset[4];
};

/* Runtime procedure table */

struct rpdr_ext
{
       unsigned char   p_adr[4];
       unsigned char   p_regmask[4];
       unsigned char   p_regoffset[4];
       unsigned char   p_fregmask[4];
       unsigned char   p_fregoffset[4];
       unsigned char   p_frameoffset[4];
       unsigned char   p_framereg[2];
       unsigned char   p_pcreg[2];
       unsigned char   p_irpss[4];
       unsigned char   p_reserved[4];
       unsigned char   p_exception_info[4];
};

/* Line numbers */

struct line_ext
{
       unsigned char   l_line[4];
};

/* Symbol external record */

struct sym_ext
{
       unsigned char   s_iss[4];
       unsigned char   s_value[4];
       unsigned char   s_bits1[1];
       unsigned char   s_bits2[1];
       unsigned char   s_bits3[1];
       unsigned char   s_bits4[1];
};

#define SYM_BITS1_ST_BIG                0xFC
#define SYM_BITS1_ST_SH_BIG             2
#define SYM_BITS1_ST_LITTLE             0x3F
#define SYM_BITS1_ST_SH_LITTLE          0

#define SYM_BITS1_SC_BIG                0x03
#define SYM_BITS1_SC_SH_LEFT_BIG        3
#define SYM_BITS1_SC_LITTLE             0xC0
#define SYM_BITS1_SC_SH_LITTLE          6

#define SYM_BITS2_SC_BIG                0xE0
#define SYM_BITS2_SC_SH_BIG             5
#define SYM_BITS2_SC_LITTLE             0x07
#define SYM_BITS2_SC_SH_LEFT_LITTLE     2

#define SYM_BITS2_RESERVED_BIG          0x10
#define SYM_BITS2_RESERVED_LITTLE       0x08

#define SYM_BITS2_INDEX_BIG             0x0F
#define SYM_BITS2_INDEX_SH_LEFT_BIG     16
#define SYM_BITS2_INDEX_LITTLE          0xF0
#define SYM_BITS2_INDEX_SH_LITTLE       4

#define SYM_BITS3_INDEX_SH_LEFT_BIG     8
#define SYM_BITS3_INDEX_SH_LEFT_LITTLE  4

#define SYM_BITS4_INDEX_SH_LEFT_BIG     0
#define SYM_BITS4_INDEX_SH_LEFT_LITTLE  12

/* External symbol external record */

struct ext_ext
{
       unsigned char   es_bits1[1];
       unsigned char   es_bits2[1];
       unsigned char   es_ifd[2];
       struct  sym_ext es_asym;
};

#define EXT_BITS1_JMPTBL_BIG            0x80
#define EXT_BITS1_JMPTBL_LITTLE         0x01

#define EXT_BITS1_COBOL_MAIN_BIG        0x40
#define EXT_BITS1_COBOL_MAIN_LITTLE     0x02

#define EXT_BITS1_WEAKEXT_BIG           0x20
#define EXT_BITS1_WEAKEXT_LITTLE        0x04

/* Dense numbers external record */

struct dnr_ext
{
       unsigned char   d_rfd[4];
       unsigned char   d_index[4];
};

/* Relative file descriptor */

struct rfd_ext
{
 unsigned char rfd[4];
};

/* Optimizer symbol external record */

struct opt_ext
{
 unsigned char o_bits1[1];
 unsigned char o_bits2[1];
 unsigned char o_bits3[1];
 unsigned char o_bits4[1];
 struct rndx_ext o_rndx;
 unsigned char o_offset[4];
};

#define OPT_BITS2_VALUE_SH_LEFT_BIG     16
#define OPT_BITS2_VALUE_SH_LEFT_LITTLE  0

#define OPT_BITS3_VALUE_SH_LEFT_BIG     8
#define OPT_BITS3_VALUE_SH_LEFT_LITTLE  8

#define OPT_BITS4_VALUE_SH_LEFT_BIG     0
#define OPT_BITS4_VALUE_SH_LEFT_LITTLE  16

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