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Diffstat (limited to 'include/coff/ecoff.h')
| -rw-r--r-- | include/coff/ecoff.h | 421 |
1 files changed, 421 insertions, 0 deletions
diff --git a/include/coff/ecoff.h b/include/coff/ecoff.h new file mode 100644 index 00000000000..9e4202e4757 --- /dev/null +++ b/include/coff/ecoff.h @@ -0,0 +1,421 @@ +#ifndef ECOFF_H +#define ECOFF_H + +/* Generic ECOFF support. + This does not include symbol information, found in sym.h and + symconst.h. */ + +/* Mips magic numbers used in filehdr. MIPS_MAGIC_LITTLE is used on + little endian machines. MIPS_MAGIC_BIG is used on big endian + machines. Where is MIPS_MAGIC_1 from? */ +#define MIPS_MAGIC_1 0x0180 +#define MIPS_MAGIC_LITTLE 0x0162 +#define MIPS_MAGIC_BIG 0x0160 + +/* These are the magic numbers used for MIPS code compiled at ISA + level 2. */ +#define MIPS_MAGIC_LITTLE2 0x0166 +#define MIPS_MAGIC_BIG2 0x0163 + +/* These are the magic numbers used for MIPS code compiled at ISA + level 3. */ +#define MIPS_MAGIC_LITTLE3 0x142 +#define MIPS_MAGIC_BIG3 0x140 + +/* Alpha magic numbers used in filehdr. */ +#define ALPHA_MAGIC 0x183 +#define ALPHA_MAGIC_BSD 0x185 + +/* Magic numbers used in a.out header. */ +#define ECOFF_AOUT_OMAGIC 0407 /* not demand paged (ld -N). */ +#define ECOFF_AOUT_ZMAGIC 0413 /* demand load format, eg normal ld output */ + +/* Names of special sections. */ +#define _TEXT ".text" +#define _DATA ".data" +#define _BSS ".bss" +#define _RDATA ".rdata" +#define _SDATA ".sdata" +#define _SBSS ".sbss" +#define _LITA ".lita" +#define _LIT4 ".lit4" +#define _LIT8 ".lit8" +#define _LIB ".lib" +#define _INIT ".init" +#define _FINI ".fini" +#define _PDATA ".pdata" +#define _XDATA ".xdata" +#define _GOT ".got" +#define _HASH ".hash" +#define _DYNSYM ".dynsym" +#define _DYNSTR ".dynstr" +#define _RELDYN ".rel.dyn" +#define _CONFLIC ".conflic" +#define _COMMENT ".comment" +#define _LIBLIST ".liblist" +#define _DYNAMIC ".dynamic" +#define _RCONST ".rconst" + +/* ECOFF uses some additional section flags. */ +#define STYP_RDATA 0x100 +#define STYP_SDATA 0x200 +#define STYP_SBSS 0x400 +#define STYP_GOT 0x1000 +#define STYP_DYNAMIC 0x2000 +#define STYP_DYNSYM 0x4000 +#define STYP_RELDYN 0x8000 +#define STYP_DYNSTR 0x10000 +#define STYP_HASH 0x20000 +#define STYP_LIBLIST 0x40000 +#define STYP_CONFLIC 0x100000 +#define STYP_ECOFF_FINI 0x1000000 +#define STYP_EXTENDESC 0x2000000 /* 0x02FFF000 bits => scn type, rest clr */ +#define STYP_LITA 0x4000000 +#define STYP_LIT8 0x8000000 +#define STYP_LIT4 0x10000000 +#define STYP_ECOFF_LIB 0x40000000 +#define STYP_ECOFF_INIT 0x80000000 +#define STYP_OTHER_LOAD (STYP_ECOFF_INIT | STYP_ECOFF_FINI) + +/* extended section types */ +#define STYP_COMMENT 0x2100000 +#define STYP_RCONST 0x2200000 +#define STYP_XDATA 0x2400000 +#define STYP_PDATA 0x2800000 + +/* The linker needs a section to hold small common variables while + linking. There is no convenient way to create it when the linker + needs it, so we always create one for each BFD. We then avoid + writing it out. */ +#define SCOMMON ".scommon" + +/* If the extern bit in a reloc is 1, then r_symndx is an index into + the external symbol table. If the extern bit is 0, then r_symndx + indicates a section, and is one of the following values. */ +#define RELOC_SECTION_NONE 0 +#define RELOC_SECTION_TEXT 1 +#define RELOC_SECTION_RDATA 2 +#define RELOC_SECTION_DATA 3 +#define RELOC_SECTION_SDATA 4 +#define RELOC_SECTION_SBSS 5 +#define RELOC_SECTION_BSS 6 +#define RELOC_SECTION_INIT 7 +#define RELOC_SECTION_LIT8 8 +#define RELOC_SECTION_LIT4 9 +#define RELOC_SECTION_XDATA 10 +#define RELOC_SECTION_PDATA 11 +#define RELOC_SECTION_FINI 12 +#define RELOC_SECTION_LITA 13 +#define RELOC_SECTION_ABS 14 +#define RELOC_SECTION_RCONST 15 + +#define NUM_RELOC_SECTIONS 16 + +/********************** STABS **********************/ + +/* gcc uses mips-tfile to output type information in special stabs + entries. These must match the corresponding definition in + gcc/config/mips.h. At some point, these should probably go into a + shared include file, but currently gcc and gdb do not share any + directories. */ +#define CODE_MASK 0x8F300 +#define ECOFF_IS_STAB(sym) (((sym)->index & 0xFFF00) == CODE_MASK) +#define ECOFF_MARK_STAB(code) ((code)+CODE_MASK) +#define ECOFF_UNMARK_STAB(code) ((code)-CODE_MASK) +#define STABS_SYMBOL "@stabs" + +/********************** COFF **********************/ + +/* gcc also uses mips-tfile to output COFF debugging information. + These are the values it uses when outputting the .type directive. + These should also be in a shared include file. */ +#define N_BTMASK (017) +#define N_TMASK (060) +#define N_BTSHFT (4) +#define N_TSHIFT (2) + +/********************** AUX **********************/ + +/* The auxiliary type information is the same on all known ECOFF + targets. I can't see any reason that it would ever change, so I am + going to gamble and define the external structures here, in the + target independent ECOFF header file. The internal forms are + defined in coff/sym.h, which was originally donated by MIPS + Computer Systems. */ + +/* Type information external record */ + +struct tir_ext { + unsigned char t_bits1[1]; + unsigned char t_tq45[1]; + unsigned char t_tq01[1]; + unsigned char t_tq23[1]; +}; + +#define TIR_BITS1_FBITFIELD_BIG ((unsigned int) 0x80) +#define TIR_BITS1_FBITFIELD_LITTLE ((unsigned int) 0x01) + +#define TIR_BITS1_CONTINUED_BIG ((unsigned int) 0x40) +#define TIR_BITS1_CONTINUED_LITTLE ((unsigned int) 0x02) + +#define TIR_BITS1_BT_BIG ((unsigned int) 0x3F) +#define TIR_BITS1_BT_SH_BIG 0 +#define TIR_BITS1_BT_LITTLE ((unsigned int) 0xFC) +#define TIR_BITS1_BT_SH_LITTLE 2 + +#define TIR_BITS_TQ4_BIG ((unsigned int) 0xF0) +#define TIR_BITS_TQ4_SH_BIG 4 +#define TIR_BITS_TQ5_BIG ((unsigned int) 0x0F) +#define TIR_BITS_TQ5_SH_BIG 0 +#define TIR_BITS_TQ4_LITTLE ((unsigned int) 0x0F) +#define TIR_BITS_TQ4_SH_LITTLE 0 +#define TIR_BITS_TQ5_LITTLE ((unsigned int) 0xF0) +#define TIR_BITS_TQ5_SH_LITTLE 4 + +#define TIR_BITS_TQ0_BIG ((unsigned int) 0xF0) +#define TIR_BITS_TQ0_SH_BIG 4 +#define TIR_BITS_TQ1_BIG ((unsigned int) 0x0F) +#define TIR_BITS_TQ1_SH_BIG 0 +#define TIR_BITS_TQ0_LITTLE ((unsigned int) 0x0F) +#define TIR_BITS_TQ0_SH_LITTLE 0 +#define TIR_BITS_TQ1_LITTLE ((unsigned int) 0xF0) +#define TIR_BITS_TQ1_SH_LITTLE 4 + +#define TIR_BITS_TQ2_BIG ((unsigned int) 0xF0) +#define TIR_BITS_TQ2_SH_BIG 4 +#define TIR_BITS_TQ3_BIG ((unsigned int) 0x0F) +#define TIR_BITS_TQ3_SH_BIG 0 +#define TIR_BITS_TQ2_LITTLE ((unsigned int) 0x0F) +#define TIR_BITS_TQ2_SH_LITTLE 0 +#define TIR_BITS_TQ3_LITTLE ((unsigned int) 0xF0) +#define TIR_BITS_TQ3_SH_LITTLE 4 + +/* Relative symbol external record */ + +struct rndx_ext { + unsigned char r_bits[4]; +}; + +#define RNDX_BITS0_RFD_SH_LEFT_BIG 4 +#define RNDX_BITS1_RFD_BIG ((unsigned int) 0xF0) +#define RNDX_BITS1_RFD_SH_BIG 4 + +#define RNDX_BITS0_RFD_SH_LEFT_LITTLE 0 +#define RNDX_BITS1_RFD_LITTLE ((unsigned int) 0x0F) +#define RNDX_BITS1_RFD_SH_LEFT_LITTLE 8 + +#define RNDX_BITS1_INDEX_BIG ((unsigned int) 0x0F) +#define RNDX_BITS1_INDEX_SH_LEFT_BIG 16 +#define RNDX_BITS2_INDEX_SH_LEFT_BIG 8 +#define RNDX_BITS3_INDEX_SH_LEFT_BIG 0 + +#define RNDX_BITS1_INDEX_LITTLE ((unsigned int) 0xF0) +#define RNDX_BITS1_INDEX_SH_LITTLE 4 +#define RNDX_BITS2_INDEX_SH_LEFT_LITTLE 4 +#define RNDX_BITS3_INDEX_SH_LEFT_LITTLE 12 + +/* Auxiliary symbol information external record */ + +union aux_ext { + struct tir_ext a_ti; + struct rndx_ext a_rndx; + unsigned char a_dnLow[4]; + unsigned char a_dnHigh[4]; + unsigned char a_isym[4]; + unsigned char a_iss[4]; + unsigned char a_width[4]; + unsigned char a_count[4]; +}; + +#define AUX_GET_ANY(bigend, ax, field) \ + ((bigend) ? bfd_getb32 ((ax)->field) : bfd_getl32 ((ax)->field)) + +#define AUX_GET_DNLOW(bigend, ax) AUX_GET_ANY ((bigend), (ax), a_dnLow) +#define AUX_GET_DNHIGH(bigend, ax) AUX_GET_ANY ((bigend), (ax), a_dnHigh) +#define AUX_GET_ISYM(bigend, ax) AUX_GET_ANY ((bigend), (ax), a_isym) +#define AUX_GET_ISS(bigend, ax) AUX_GET_ANY ((bigend), (ax), a_iss) +#define AUX_GET_WIDTH(bigend, ax) AUX_GET_ANY ((bigend), (ax), a_width) +#define AUX_GET_COUNT(bigend, ax) AUX_GET_ANY ((bigend), (ax), a_count) + +#define AUX_PUT_ANY(bigend, val, ax, field) \ + ((bigend) \ + ? (bfd_putb32 ((bfd_vma) (val), (ax)->field), 0) \ + : (bfd_putl32 ((bfd_vma) (val), (ax)->field), 0)) + +#define AUX_PUT_DNLOW(bigend, val, ax) \ + AUX_PUT_ANY ((bigend), (val), (ax), a_dnLow) +#define AUX_PUT_DNHIGH(bigend, val, ax) \ + AUX_PUT_ANY ((bigend), (val), (ax), a_dnHigh) +#define AUX_PUT_ISYM(bigend, val, ax) \ + AUX_PUT_ANY ((bigend), (val), (ax), a_isym) +#define AUX_PUT_ISS(bigend, val, ax) \ + AUX_PUT_ANY ((bigend), (val), (ax), a_iss) +#define AUX_PUT_WIDTH(bigend, val, ax) \ + AUX_PUT_ANY ((bigend), (val), (ax), a_width) +#define AUX_PUT_COUNT(bigend, val, ax) \ + AUX_PUT_ANY ((bigend), (val), (ax), a_count) + +/********************** SYMBOLS **********************/ + +/* For efficiency, gdb deals directly with the unswapped symbolic + information (that way it only takes the time to swap information + that it really needs to read). gdb originally retrieved the + information directly from the BFD backend information, but that + strategy, besides being sort of ugly, does not work for MIPS ELF, + which also uses ECOFF debugging information. This structure holds + pointers to the (mostly) unswapped symbolic information. */ + +struct ecoff_debug_info +{ + /* The swapped ECOFF symbolic header. */ + HDRR symbolic_header; + + /* Pointers to the unswapped symbolic information. Note that the + pointers to external structures point to different sorts of + information on different ECOFF targets. The ecoff_debug_swap + structure provides the sizes of the structures and the functions + needed to swap the information in and out. These pointers are + all pointers to arrays, not single structures. They will be NULL + if there are no instances of the relevant structure. These + fields are also used by the assembler to output ECOFF debugging + information. */ + unsigned char *line; + PTR external_dnr; /* struct dnr_ext */ + PTR external_pdr; /* struct pdr_ext */ + PTR external_sym; /* struct sym_ext */ + PTR external_opt; /* struct opt_ext */ + union aux_ext *external_aux; + char *ss; + char *ssext; + PTR external_fdr; /* struct fdr_ext */ + PTR external_rfd; /* struct rfd_ext */ + PTR external_ext; /* struct ext_ext */ + + /* These fields are used when linking. They may disappear at some + point. */ + char *ssext_end; + PTR external_ext_end; + + /* When linking, this field holds a mapping from the input FDR + numbers to the output numbers, and is used when writing out the + external symbols. It is NULL if no mapping is required. */ + RFDT *ifdmap; + + /* The swapped FDR information. Currently this is never NULL, but + code using this structure should probably double-check in case + this changes in the future. This is a pointer to an array, not a + single structure. */ + FDR *fdr; + + /* When relaxing MIPS embedded PIC code, we may need to adjust + symbol values when they are output. This is a linked list of + structures indicating how values should be adjusted. There is no + requirement that the entries be in any order, or that they not + overlap. This field is normally NULL, in which case no + adjustments need to be made. */ + struct ecoff_value_adjust *adjust; +}; + +/* This structure describes how to adjust symbol values when + outputting MIPS embedded PIC code. These adjustments only apply to + the internal symbols, as the external symbol values will come from + the hash table and have already been adjusted. */ + +struct ecoff_value_adjust +{ + /* Next entry on adjustment list. */ + struct ecoff_value_adjust *next; + /* Starting VMA of adjustment. This is the VMA in the ECOFF file, + not the offset from the start of the section. Thus it should + indicate a particular section. */ + bfd_vma start; + /* Ending VMA of adjustment. */ + bfd_vma end; + /* Adjustment. This should be added to the value of the symbol, or + FDR. This is zero for the last entry in the array. */ + long adjust; +}; + +/* These structures are used by the ECOFF find_nearest_line function. */ + +struct ecoff_fdrtab_entry +{ + /* Base address in .text of this FDR. */ + bfd_vma base_addr; + FDR *fdr; +}; + +struct ecoff_find_line +{ + /* Allocated memory to hold function and file names. */ + char *find_buffer; + + /* FDR table, sorted by address: */ + long fdrtab_len; + struct ecoff_fdrtab_entry *fdrtab; + + /* Cache entry for most recently found line information. The sect + field is NULL if this cache does not contain valid information. */ + struct + { + asection *sect; + bfd_vma start; + bfd_vma stop; + const char *filename; + const char *functionname; + unsigned int line_num; + } cache; +}; + +/********************** SWAPPING **********************/ + +/* The generic ECOFF code needs to be able to swap debugging + information in and out in the specific format used by a particular + ECOFF implementation. This structure provides the information + needed to do this. */ + +struct ecoff_debug_swap +{ + /* Symbol table magic number. */ + int sym_magic; + /* Alignment of debugging information. E.g., 4. */ + bfd_size_type debug_align; + /* Sizes of external symbolic information. */ + bfd_size_type external_hdr_size; + bfd_size_type external_dnr_size; + bfd_size_type external_pdr_size; + bfd_size_type external_sym_size; + bfd_size_type external_opt_size; + bfd_size_type external_fdr_size; + bfd_size_type external_rfd_size; + bfd_size_type external_ext_size; + /* Functions to swap in external symbolic data. */ + void (*swap_hdr_in) PARAMS ((bfd *, PTR, HDRR *)); + void (*swap_dnr_in) PARAMS ((bfd *, PTR, DNR *)); + void (*swap_pdr_in) PARAMS ((bfd *, PTR, PDR *)); + void (*swap_sym_in) PARAMS ((bfd *, PTR, SYMR *)); + void (*swap_opt_in) PARAMS ((bfd *, PTR, OPTR *)); + void (*swap_fdr_in) PARAMS ((bfd *, PTR, FDR *)); + void (*swap_rfd_in) PARAMS ((bfd *, PTR, RFDT *)); + void (*swap_ext_in) PARAMS ((bfd *, PTR, EXTR *)); + void (*swap_tir_in) PARAMS ((int, const struct tir_ext *, TIR *)); + void (*swap_rndx_in) PARAMS ((int, const struct rndx_ext *, RNDXR *)); + /* Functions to swap out external symbolic data. */ + void (*swap_hdr_out) PARAMS ((bfd *, const HDRR *, PTR)); + void (*swap_dnr_out) PARAMS ((bfd *, const DNR *, PTR)); + void (*swap_pdr_out) PARAMS ((bfd *, const PDR *, PTR)); + void (*swap_sym_out) PARAMS ((bfd *, const SYMR *, PTR)); + void (*swap_opt_out) PARAMS ((bfd *, const OPTR *, PTR)); + void (*swap_fdr_out) PARAMS ((bfd *, const FDR *, PTR)); + void (*swap_rfd_out) PARAMS ((bfd *, const RFDT *, PTR)); + void (*swap_ext_out) PARAMS ((bfd *, const EXTR *, PTR)); + void (*swap_tir_out) PARAMS ((int, const TIR *, struct tir_ext *)); + void (*swap_rndx_out) PARAMS ((int, const RNDXR *, struct rndx_ext *)); + /* Function to read symbol data and set up pointers in + ecoff_debug_info structure. The section argument is used for + ELF, not straight ECOFF. */ + boolean (*read_debug_info) PARAMS ((bfd *, asection *, + struct ecoff_debug_info *)); +}; + +#endif /* ! defined (ECOFF_H) */ |