264 lines
8.9 KiB
C
264 lines
8.9 KiB
C
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/* $Id: ecoff.h,v 1.1 1994/01/28 12:42:38 pk Exp $ */
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#ifndef ECOFF_H
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#define ECOFF_H
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/* 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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/* 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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/* 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 _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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/* 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_ECOFF_FINI 0x1000000
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#define STYP_LIT8 0x8000000
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#define STYP_LIT4 0x10000000
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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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/* 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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/* The ECOFF a.out header carries information about register masks and
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the gp value. The assembler needs to be able to write out this
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information, and objcopy needs to be able to copy it from one file
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to another. To handle this in BFD, we use a dummy section to hold
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the information. We call this section .reginfo, since MIPS ELF has
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a .reginfo section which serves a similar purpose. When BFD
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recognizes an ECOFF object, it copies the information into a
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private data structure. When the .reginfo section is read, the
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information is retrieved from the private data structure. When the
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.reginfo section is written, the information in the private data
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structure is updated. The contents of the .reginfo section, as
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seen by programs outside BFD, is a ecoff_reginfo structure. The
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contents of the structure are as seen on the host, so no swapping
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issues arise.
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The assembler used to update the private BFD data structures
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directly. With this approach, it instead just creates a .reginfo
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section and updates that. The real advantage of this approach is
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that objcopy works automatically. */
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#define REGINFO ".reginfo"
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struct ecoff_reginfo
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{
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bfd_vma gp_value; /* GP register value. */
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unsigned long gprmask; /* General registers used. */
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unsigned long cprmask[4]; /* Coprocessor registers used. */
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unsigned long fprmask; /* Floating pointer registers used. */
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};
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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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/********************** 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 0x80
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#define TIR_BITS1_FBITFIELD_LITTLE 0x01
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#define TIR_BITS1_CONTINUED_BIG 0x40
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#define TIR_BITS1_CONTINUED_LITTLE 0x02
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#define TIR_BITS1_BT_BIG 0x3F
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#define TIR_BITS1_BT_SH_BIG 0
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#define TIR_BITS1_BT_LITTLE 0xFC
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#define TIR_BITS1_BT_SH_LITTLE 2
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#define TIR_BITS_TQ4_BIG 0xF0
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#define TIR_BITS_TQ4_SH_BIG 4
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#define TIR_BITS_TQ5_BIG 0x0F
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#define TIR_BITS_TQ5_SH_BIG 0
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#define TIR_BITS_TQ4_LITTLE 0x0F
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#define TIR_BITS_TQ4_SH_LITTLE 0
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#define TIR_BITS_TQ5_LITTLE 0xF0
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#define TIR_BITS_TQ5_SH_LITTLE 4
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#define TIR_BITS_TQ0_BIG 0xF0
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#define TIR_BITS_TQ0_SH_BIG 4
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#define TIR_BITS_TQ1_BIG 0x0F
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#define TIR_BITS_TQ1_SH_BIG 0
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#define TIR_BITS_TQ0_LITTLE 0x0F
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#define TIR_BITS_TQ0_SH_LITTLE 0
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#define TIR_BITS_TQ1_LITTLE 0xF0
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#define TIR_BITS_TQ1_SH_LITTLE 4
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#define TIR_BITS_TQ2_BIG 0xF0
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#define TIR_BITS_TQ2_SH_BIG 4
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#define TIR_BITS_TQ3_BIG 0x0F
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#define TIR_BITS_TQ3_SH_BIG 0
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#define TIR_BITS_TQ2_LITTLE 0x0F
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#define TIR_BITS_TQ2_SH_LITTLE 0
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#define TIR_BITS_TQ3_LITTLE 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 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 0x0F
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#define RNDX_BITS1_RFD_SH_LEFT_LITTLE 8
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#define RNDX_BITS1_INDEX_BIG 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 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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/* Prototypes for the swapping functions. These require that sym.h be
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included before this file. */
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extern void ecoff_swap_tir_in PARAMS ((int bigend, struct tir_ext *, TIR *));
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extern void ecoff_swap_tir_out PARAMS ((int bigend, TIR *, struct tir_ext *));
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extern void ecoff_swap_rndx_in PARAMS ((int bigend, struct rndx_ext *,
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RNDXR *));
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extern void ecoff_swap_rndx_out PARAMS ((int bigend, RNDXR *,
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struct rndx_ext *));
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#endif /* ! defined (ECOFF_H) */
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