* mips.h (MIPS_R_SWITCH): Define.
This commit is contained in:
Ian Lance Taylor
parent
99a6c7613c
commit
f268681bc0
2 changed files with 253 additions and 91 deletions
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@ -1,3 +1,7 @@
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Thu Apr 7 14:19:35 1994 Ian Lance Taylor (ian@tweedledumb.cygnus.com)
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* mips.h (MIPS_R_SWITCH): Define.
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Thu Mar 31 19:28:33 1994 Ken Raeburn (raeburn@cujo.cygnus.com)
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* internal.h (internal_aouthdr): Added comments for Apollo fields.
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@ -1,6 +1,5 @@
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/* Rudimentary ECOFF support on MIPS machines.
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This lacks symbol information, normally provided on MIPS Unix systems
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in the files <sym.h> and <symconst.h>. */
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/* ECOFF support on MIPS machines.
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coff/ecoff.h must be included before this file. */
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/********************** FILE HEADER **********************/
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@ -14,18 +13,14 @@ struct external_filehdr {
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unsigned char f_flags[2]; /* flags */
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};
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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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#define ECOFFBADMAG(x) (((x).f_magic!=MIPS_MAGIC_1) && \
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((x).f_magic!=MIPS_MAGIC_LITTLE) &&\
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((x).f_magic!=MIPS_MAGIC_BIG))
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/* Magic numbers are defined in coff/ecoff.h. */
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#define MIPS_ECOFF_BADMAG(x) (((x).f_magic!=MIPS_MAGIC_1) && \
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((x).f_magic!=MIPS_MAGIC_LITTLE) &&\
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((x).f_magic!=MIPS_MAGIC_BIG) && \
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((x).f_magic!=MIPS_MAGIC_LITTLE2) && \
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((x).f_magic!=MIPS_MAGIC_BIG2) && \
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((x).f_magic!=MIPS_MAGIC_LITTLE3) && \
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((x).f_magic!=MIPS_MAGIC_BIG3))
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#define FILHDR struct external_filehdr
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#define FILHSZ 20
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@ -53,9 +48,6 @@ typedef struct external_aouthdr
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#define AOUTSZ (sizeof(AOUTHDR))
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#define OMAGIC 0407 /* not demand paged (ld -N). */
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#define ZMAGIC 0413 /* demand load format, eg normal ld output */
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/********************** SECTION HEADER **********************/
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struct external_scnhdr {
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@ -74,35 +66,6 @@ struct external_scnhdr {
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#define SCNHDR struct external_scnhdr
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#define SCNHSZ sizeof(SCNHDR)
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/*
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* names of "special" sections
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*/
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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 _LIT4 ".lit4"
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#define _LIT8 ".lit8"
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#define _LIB ".lib"
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#define DEFAULT_DATA_SECTION_ALIGNMENT 4
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#define DEFAULT_BSS_SECTION_ALIGNMENT 4
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#define DEFAULT_TEXT_SECTION_ALIGNMENT 16
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/* For new sections we havn't heard of before */
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#define DEFAULT_SECTION_ALIGNMENT 4
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/* MIPS ECOFF uses some additional section types. */
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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_LIT8 0x8000000
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#define STYP_LIT4 0x10000000
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/* I don't know when this is used. */
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#define STYP_OTHER_LOAD 0x80000000
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/********************** RELOCATION DIRECTIVES **********************/
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struct external_reloc {
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@ -133,54 +96,249 @@ struct external_reloc {
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#define RELOC_BITS3_EXTERN_BIG 0x01
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#define RELOC_BITS3_EXTERN_LITTLE 0x80
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/* We store the extern field in the r_offset field of a struct
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internal_reloc. FIXME: Do this more sensibly. */
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#define r_extern r_offset
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/* The r_type field in a reloc is one of the following values. I
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don't know if any other values can appear. These seem to be all
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that occur in the Ultrix 4.2 libraries. */
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#define MIPS_R_IGNORE 0
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#define MIPS_R_REFHALF 1
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#define MIPS_R_REFWORD 2
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#define MIPS_R_JMPADDR 3
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#define MIPS_R_REFHI 4
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#define MIPS_R_REFLO 5
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#define MIPS_R_GPREL 6
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#define MIPS_R_LITERAL 7
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/* If the extern bit is 1, then r_symndx is an index into the external
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symbol table. If the extern bit is 0, then r_symndx indicates a
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section, and is one of the following values. */
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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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/* This reloc type is a Cygnus extension used when generating position
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independent code for embedded systems. */
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#define MIPS_R_PCREL16 8
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/* The r_type field is one of the following values. I don't know if
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any other values can appear. These seem to be all that occur in
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the Ultrix 4.2 libraries. */
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#define ECOFF_R_IGNORE 0
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#define ECOFF_R_REFHALF 1
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#define ECOFF_R_REFWORD 2
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#define ECOFF_R_JMPADDR 3
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#define ECOFF_R_REFHI 4
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#define ECOFF_R_REFLO 5
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#define ECOFF_R_GPREL 6
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#define ECOFF_R_LITERAL 7
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/* This reloc type is a Cygnus extension used when generating position
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independent code for embedded systems. It is used for an entry in
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a switch table, which looks like this:
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.switch $L3-$LS12
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The object file will contain the correct difference, and does not
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require adjustment. However, when the linker is relaxing PC
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relative calls, it is possible for $L3 to move farther away. This
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reloc always appears in the .text section, and is always against
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the .text section. However, the symbol index is not
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RELOC_SECTION_TEXT. It is, instead, the distance between this
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switch table entry and $LS12. Thus, the original value of $L12 is
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vaddr - symndx
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and the original value of $L3 is
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vaddr - symndx + addend
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where addend is the value in the object file. Knowing this, the
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linker can know whether the addend in the object file must be
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adjusted. */
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#define MIPS_R_SWITCH 9
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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 MIPS_IS_STAB(sym) (((sym)->index & 0xFFF00) == CODE_MASK)
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#define MIPS_MARK_STAB(code) ((code)+CODE_MASK)
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#define MIPS_UNMARK_STAB(code) ((code)-CODE_MASK)
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#define STABS_SYMBOL "@stabs"
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#define MIPS_IS_STAB ECOFF_IS_STAB
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#define MIPS_MARK_STAB ECOFF_MARK_STAB
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#define MIPS_UNMARK_STAB ECOFF_UNMARK_STAB
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/********************** COFF **********************/
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#define DEFAULT_DATA_SECTION_ALIGNMENT 4
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#define DEFAULT_BSS_SECTION_ALIGNMENT 4
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#define DEFAULT_TEXT_SECTION_ALIGNMENT 16
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/* For new sections we havn't heard of before */
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#define DEFAULT_SECTION_ALIGNMENT 4
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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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/********************** SYMBOLIC INFORMATION **********************/
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/* Written by John Gilmore. */
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/* ECOFF uses COFF-like section structures, but its own symbol format.
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This file defines the symbol format in fields whose size and alignment
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will not vary on different host systems. */
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/* File header as a set of bytes */
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struct hdr_ext {
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unsigned char h_magic[2];
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unsigned char h_vstamp[2];
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unsigned char h_ilineMax[4];
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unsigned char h_cbLine[4];
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unsigned char h_cbLineOffset[4];
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unsigned char h_idnMax[4];
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unsigned char h_cbDnOffset[4];
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unsigned char h_ipdMax[4];
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unsigned char h_cbPdOffset[4];
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unsigned char h_isymMax[4];
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unsigned char h_cbSymOffset[4];
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unsigned char h_ioptMax[4];
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unsigned char h_cbOptOffset[4];
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unsigned char h_iauxMax[4];
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unsigned char h_cbAuxOffset[4];
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unsigned char h_issMax[4];
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unsigned char h_cbSsOffset[4];
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unsigned char h_issExtMax[4];
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unsigned char h_cbSsExtOffset[4];
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unsigned char h_ifdMax[4];
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unsigned char h_cbFdOffset[4];
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unsigned char h_crfd[4];
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unsigned char h_cbRfdOffset[4];
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unsigned char h_iextMax[4];
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unsigned char h_cbExtOffset[4];
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};
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/* File descriptor external record */
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struct fdr_ext {
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unsigned char f_adr[4];
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unsigned char f_rss[4];
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unsigned char f_issBase[4];
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unsigned char f_cbSs[4];
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unsigned char f_isymBase[4];
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unsigned char f_csym[4];
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unsigned char f_ilineBase[4];
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unsigned char f_cline[4];
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unsigned char f_ioptBase[4];
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unsigned char f_copt[4];
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unsigned char f_ipdFirst[2];
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unsigned char f_cpd[2];
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unsigned char f_iauxBase[4];
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unsigned char f_caux[4];
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unsigned char f_rfdBase[4];
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unsigned char f_crfd[4];
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unsigned char f_bits1[1];
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unsigned char f_bits2[3];
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unsigned char f_cbLineOffset[4];
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unsigned char f_cbLine[4];
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};
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#define FDR_BITS1_LANG_BIG 0xF8
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#define FDR_BITS1_LANG_SH_BIG 3
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#define FDR_BITS1_LANG_LITTLE 0x1F
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#define FDR_BITS1_LANG_SH_LITTLE 0
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#define FDR_BITS1_FMERGE_BIG 0x04
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#define FDR_BITS1_FMERGE_LITTLE 0x20
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#define FDR_BITS1_FREADIN_BIG 0x02
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#define FDR_BITS1_FREADIN_LITTLE 0x40
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#define FDR_BITS1_FBIGENDIAN_BIG 0x01
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#define FDR_BITS1_FBIGENDIAN_LITTLE 0x80
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#define FDR_BITS2_GLEVEL_BIG 0xC0
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#define FDR_BITS2_GLEVEL_SH_BIG 6
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#define FDR_BITS2_GLEVEL_LITTLE 0x03
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#define FDR_BITS2_GLEVEL_SH_LITTLE 0
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/* We ignore the `reserved' field in bits2. */
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/* Procedure descriptor external record */
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struct pdr_ext {
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unsigned char p_adr[4];
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unsigned char p_isym[4];
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unsigned char p_iline[4];
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unsigned char p_regmask[4];
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unsigned char p_regoffset[4];
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unsigned char p_iopt[4];
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unsigned char p_fregmask[4];
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unsigned char p_fregoffset[4];
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unsigned char p_frameoffset[4];
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unsigned char p_framereg[2];
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unsigned char p_pcreg[2];
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unsigned char p_lnLow[4];
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unsigned char p_lnHigh[4];
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unsigned char p_cbLineOffset[4];
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};
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/* Line numbers */
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struct line_ext {
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unsigned char l_line[4];
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};
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/* Symbol external record */
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struct sym_ext {
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unsigned char s_iss[4];
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unsigned char s_value[4];
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unsigned char s_bits1[1];
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unsigned char s_bits2[1];
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unsigned char s_bits3[1];
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unsigned char s_bits4[1];
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};
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#define SYM_BITS1_ST_BIG 0xFC
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#define SYM_BITS1_ST_SH_BIG 2
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#define SYM_BITS1_ST_LITTLE 0x3F
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#define SYM_BITS1_ST_SH_LITTLE 0
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#define SYM_BITS1_SC_BIG 0x03
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#define SYM_BITS1_SC_SH_LEFT_BIG 3
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#define SYM_BITS1_SC_LITTLE 0xC0
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#define SYM_BITS1_SC_SH_LITTLE 6
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#define SYM_BITS2_SC_BIG 0xE0
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#define SYM_BITS2_SC_SH_BIG 5
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#define SYM_BITS2_SC_LITTLE 0x07
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#define SYM_BITS2_SC_SH_LEFT_LITTLE 2
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#define SYM_BITS2_RESERVED_BIG 0x10
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#define SYM_BITS2_RESERVED_LITTLE 0x08
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#define SYM_BITS2_INDEX_BIG 0x0F
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#define SYM_BITS2_INDEX_SH_LEFT_BIG 16
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#define SYM_BITS2_INDEX_LITTLE 0xF0
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#define SYM_BITS2_INDEX_SH_LITTLE 4
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#define SYM_BITS3_INDEX_SH_LEFT_BIG 8
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#define SYM_BITS3_INDEX_SH_LEFT_LITTLE 4
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#define SYM_BITS4_INDEX_SH_LEFT_BIG 0
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#define SYM_BITS4_INDEX_SH_LEFT_LITTLE 12
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/* External symbol external record */
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struct ext_ext {
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unsigned char es_bits1[1];
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unsigned char es_bits2[1];
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unsigned char es_ifd[2];
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struct sym_ext es_asym;
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};
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#define EXT_BITS1_JMPTBL_BIG 0x80
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#define EXT_BITS1_JMPTBL_LITTLE 0x01
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#define EXT_BITS1_COBOL_MAIN_BIG 0x40
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#define EXT_BITS1_COBOL_MAIN_LITTLE 0x02
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#define EXT_BITS1_WEAKEXT_BIG 0x20
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#define EXT_BITS1_WEAKEXT_LITTLE 0x04
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/* Dense numbers external record */
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struct dnr_ext {
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unsigned char d_rfd[4];
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unsigned char d_index[4];
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};
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/* Relative file descriptor */
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struct rfd_ext {
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unsigned char rfd[4];
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};
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/* Optimizer symbol external record */
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struct opt_ext {
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unsigned char o_bits1[1];
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unsigned char o_bits2[1];
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unsigned char o_bits3[1];
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unsigned char o_bits4[1];
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struct rndx_ext o_rndx;
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unsigned char o_offset[4];
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};
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#define OPT_BITS2_VALUE_SH_LEFT_BIG 16
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#define OPT_BITS2_VALUE_SH_LEFT_LITTLE 0
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#define OPT_BITS3_VALUE_SH_LEFT_BIG 8
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#define OPT_BITS3_VALUE_SH_LEFT_LITTLE 8
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#define OPT_BITS4_VALUE_SH_LEFT_BIG 0
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#define OPT_BITS4_VALUE_SH_LEFT_LITTLE 16
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