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

  Copyright (C) 2001-2024 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.  */

/********************** FILE HEADER **********************/

struct external_filehdr
{
 unsigned char f_magic[2];     /* magic number                 */
 unsigned char f_nscns[2];     /* number of sections           */
 unsigned char f_timdat[4];    /* time & date stamp            */
 unsigned char f_symptr[8];    /* file pointer to symtab       */
 unsigned char f_nsyms[4];     /* number of symtab entries     */
 unsigned char f_opthdr[2];    /* sizeof(optional hdr)         */
 unsigned char f_flags[2];     /* flags                        */
};

/* Magic numbers are defined in coff/ecoff.h.  */
#define ALPHA_ECOFF_BADMAG(x) \
 ((x).f_magic != ALPHA_MAGIC && (x).f_magic != ALPHA_MAGIC_BSD)

#define ALPHA_ECOFF_COMPRESSEDMAG(x) \
 ((x).f_magic == ALPHA_MAGIC_COMPRESSED)

/* The object type is encoded in the f_flags.  */
#define F_ALPHA_OBJECT_TYPE_MASK        0x3000
#define F_ALPHA_NO_SHARED               0x1000
#define F_ALPHA_SHARABLE                0x2000
#define F_ALPHA_CALL_SHARED             0x3000

#define FILHDR  struct external_filehdr
#define FILHSZ  24

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

typedef struct external_aouthdr
{
 unsigned char magic[2];       /* type of file                         */
 unsigned char vstamp[2];      /* version stamp                        */
 unsigned char bldrev[2];      /* ?? */
 unsigned char padding[2];     /* pad to quadword boundary             */
 unsigned char tsize[8];       /* text size in bytes                   */
 unsigned char dsize[8];       /* initialized data "  "                */
 unsigned char bsize[8];       /* uninitialized data "   "             */
 unsigned char entry[8];       /* entry pt.                            */
 unsigned char text_start[8];  /* base of text used for this file */
 unsigned char data_start[8];  /* base of data used for this file */
 unsigned char bss_start[8];   /* base of bss used for this file */
 unsigned char gprmask[4];     /* bitmask of general registers used */
 unsigned char fprmask[4];     /* bitmask of floating point registers used */
 unsigned char gp_value[8];    /* value for gp register */
} AOUTHDR;

/* compute size of a header */

#define AOUTSZ 80
#define AOUTHDRSZ 80

/********************** SECTION HEADER **********************/

struct external_scnhdr
{
 unsigned char s_name[8];      /* section name                 */
 unsigned char s_paddr[8];     /* physical address, aliased s_nlib */
 unsigned char s_vaddr[8];     /* virtual address              */
 unsigned char s_size[8];      /* section size                 */
 unsigned char s_scnptr[8];    /* file ptr to raw data for section */
 unsigned char s_relptr[8];    /* file ptr to relocation       */
 unsigned char s_lnnoptr[8];   /* file ptr to line numbers     */
 unsigned char s_nreloc[2];    /* number of relocation entries */
 unsigned char s_nlnno[2];     /* number of line number entries*/
 unsigned char s_flags[4];     /* flags                        */
};

#define SCNHDR  struct external_scnhdr
#define SCNHSZ  64

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

struct external_reloc
{
 unsigned char r_vaddr[8];
 unsigned char r_symndx[4];
 unsigned char r_bits[4];
};

#define RELOC struct external_reloc
#define RELSZ 16

/* Constants to unpack the r_bits field.  The Alpha seems to always be
  little endian, so I haven't bothered to define big endian variants
  of these.  */

#define RELOC_BITS0_TYPE_LITTLE                 0xff
#define RELOC_BITS0_TYPE_SH_LITTLE              0

#define RELOC_BITS1_EXTERN_LITTLE               0x01

#define RELOC_BITS1_OFFSET_LITTLE               0x7e
#define RELOC_BITS1_OFFSET_SH_LITTLE            1

#define RELOC_BITS1_RESERVED_LITTLE             0x80
#define RELOC_BITS1_RESERVED_SH_LITTLE          7
#define RELOC_BITS2_RESERVED_LITTLE             0xff
#define RELOC_BITS2_RESERVED_SH_LEFT_LITTLE     1
#define RELOC_BITS3_RESERVED_LITTLE             0x03
#define RELOC_BITS3_RESERVED_SH_LEFT_LITTLE     9

#define RELOC_BITS3_SIZE_LITTLE                 0xfc
#define RELOC_BITS3_SIZE_SH_LITTLE              2

/* The r_type field in a reloc is one of the following values.  */
#define ALPHA_R_IGNORE          0
#define ALPHA_R_REFLONG         1
#define ALPHA_R_REFQUAD         2
#define ALPHA_R_GPREL32         3
#define ALPHA_R_LITERAL         4
#define ALPHA_R_LITUSE          5
#define ALPHA_R_GPDISP          6
#define ALPHA_R_BRADDR          7
#define ALPHA_R_HINT            8
#define ALPHA_R_SREL16          9
#define ALPHA_R_SREL32         10
#define ALPHA_R_SREL64         11
#define ALPHA_R_OP_PUSH        12
#define ALPHA_R_OP_STORE       13
#define ALPHA_R_OP_PSUB        14
#define ALPHA_R_OP_PRSHIFT     15
#define ALPHA_R_GPVALUE        16
#define ALPHA_R_GPRELHIGH      17
#define ALPHA_R_GPRELLOW       18
#define ALPHA_R_IMMED          19

/* Overloaded reloc value used by Net- and OpenBSD.  */
#define ALPHA_R_LITERALSLEAZY  17

/* With ALPHA_R_LITUSE, the r_size field is one of the following values.  */
#define ALPHA_R_LU_BASE         1
#define ALPHA_R_LU_BYTOFF       2
#define ALPHA_R_LU_JSR          3

/* With ALPHA_R_IMMED, the r_size field is one of the following values.  */
#define ALPHA_R_IMMED_GP_16     1
#define ALPHA_R_IMMED_GP_HI32   2
#define ALPHA_R_IMMED_SCN_HI32  3
#define ALPHA_R_IMMED_BR_HI32   4
#define ALPHA_R_IMMED_LO32      5

/********************** 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_idnMax[4];
       unsigned char   h_ipdMax[4];
       unsigned char   h_isymMax[4];
       unsigned char   h_ioptMax[4];
       unsigned char   h_iauxMax[4];
       unsigned char   h_issMax[4];
       unsigned char   h_issExtMax[4];
       unsigned char   h_ifdMax[4];
       unsigned char   h_crfd[4];
       unsigned char   h_iextMax[4];
       unsigned char   h_cbLine[8];
       unsigned char   h_cbLineOffset[8];
       unsigned char   h_cbDnOffset[8];
       unsigned char   h_cbPdOffset[8];
       unsigned char   h_cbSymOffset[8];
       unsigned char   h_cbOptOffset[8];
       unsigned char   h_cbAuxOffset[8];
       unsigned char   h_cbSsOffset[8];
       unsigned char   h_cbSsExtOffset[8];
       unsigned char   h_cbFdOffset[8];
       unsigned char   h_cbRfdOffset[8];
       unsigned char   h_cbExtOffset[8];
};

/* File descriptor external record */

struct fdr_ext
{
       unsigned char   f_adr[8];
       unsigned char   f_cbLineOffset[8];
       unsigned char   f_cbLine[8];
       unsigned char   f_cbSs[8];
       unsigned char   f_rss[4];
       unsigned char   f_issBase[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[4];
       unsigned char   f_cpd[4];
       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_padding[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[8];
       unsigned char   p_cbLineOffset[8];
       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_lnLow[4];
       unsigned char   p_lnHigh[4];
       unsigned char   p_gp_prologue[1];
       unsigned char   p_bits1[1];
       unsigned char   p_bits2[1];
       unsigned char   p_localoff[1];
       unsigned char   p_framereg[2];
       unsigned char   p_pcreg[2];
};

#define PDR_BITS1_GP_USED_BIG           0x80
#define PDR_BITS1_REG_FRAME_BIG         0x40
#define PDR_BITS1_PROF_BIG              0x20
#define PDR_BITS1_RESERVED_BIG          0x1f
#define PDR_BITS1_RESERVED_SH_LEFT_BIG  8
#define PDR_BITS2_RESERVED_BIG          0xff
#define PDR_BITS2_RESERVED_SH_BIG       0

#define PDR_BITS1_GP_USED_LITTLE        0x01
#define PDR_BITS1_REG_FRAME_LITTLE      0x02
#define PDR_BITS1_PROF_LITTLE           0x04
#define PDR_BITS1_RESERVED_LITTLE       0xf8
#define PDR_BITS1_RESERVED_SH_LITTLE    3
#define PDR_BITS2_RESERVED_LITTLE       0xff
#define PDR_BITS2_RESERVED_SH_LEFT_LITTLE 5

/* Line numbers */

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

/* Symbol external record */

struct sym_ext {
       unsigned char   s_value[8];
       unsigned char   s_iss[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 {
       struct  sym_ext es_asym;
       unsigned char   es_bits1[1];
       unsigned char   es_bits2[3];
       unsigned char   es_ifd[4];
};

#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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