344 lines
9.9 KiB
C
344 lines
9.9 KiB
C
/* 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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struct external_filehdr {
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unsigned char f_magic[2]; /* magic number */
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unsigned char f_nscns[2]; /* number of sections */
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unsigned char f_timdat[4]; /* time & date stamp */
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unsigned char f_symptr[4]; /* file pointer to symtab */
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unsigned char f_nsyms[4]; /* number of symtab entries */
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unsigned char f_opthdr[2]; /* sizeof(optional hdr) */
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unsigned char f_flags[2]; /* flags */
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};
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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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/********************** AOUT "OPTIONAL HEADER" **********************/
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typedef struct external_aouthdr
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{
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unsigned char magic[2]; /* type of file */
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unsigned char vstamp[2]; /* version stamp */
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unsigned char tsize[4]; /* text size in bytes, padded to FW bdry*/
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unsigned char dsize[4]; /* initialized data " " */
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unsigned char bsize[4]; /* uninitialized data " " */
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unsigned char entry[4]; /* entry pt. */
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unsigned char text_start[4]; /* base of text used for this file */
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unsigned char data_start[4]; /* base of data used for this file */
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unsigned char bss_start[4]; /* base of bss used for this file */
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unsigned char gprmask[4]; /* ?? */
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unsigned char cprmask[4][4]; /* ?? */
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unsigned char gp_value[4]; /* value for gp register */
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} AOUTHDR;
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/* compute size of a header */
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#define AOUTSZ (sizeof(AOUTHDR))
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/********************** SECTION HEADER **********************/
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struct external_scnhdr {
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unsigned char s_name[8]; /* section name */
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unsigned char s_paddr[4]; /* physical address, aliased s_nlib */
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unsigned char s_vaddr[4]; /* virtual address */
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unsigned char s_size[4]; /* section size */
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unsigned char s_scnptr[4]; /* file ptr to raw data for section */
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unsigned char s_relptr[4]; /* file ptr to relocation */
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unsigned char s_lnnoptr[4]; /* file ptr to line numbers */
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unsigned char s_nreloc[2]; /* number of relocation entries */
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unsigned char s_nlnno[2]; /* number of line number entries*/
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unsigned char s_flags[4]; /* flags */
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};
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#define SCNHDR struct external_scnhdr
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#define SCNHSZ sizeof(SCNHDR)
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/********************** RELOCATION DIRECTIVES **********************/
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struct external_reloc {
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unsigned char r_vaddr[4];
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unsigned char r_bits[4];
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};
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#define RELOC struct external_reloc
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#define RELSZ 8
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/* MIPS ECOFF uses a packed 8 byte format for relocs. These constants
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are used to unpack the r_bits field. */
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#define RELOC_BITS0_SYMNDX_SH_LEFT_BIG 16
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#define RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE 0
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#define RELOC_BITS1_SYMNDX_SH_LEFT_BIG 8
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#define RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE 8
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#define RELOC_BITS2_SYMNDX_SH_LEFT_BIG 0
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#define RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE 16
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#define RELOC_BITS3_TYPE_BIG 0x1E
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#define RELOC_BITS3_TYPE_SH_BIG 1
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#define RELOC_BITS3_TYPE_LITTLE 0x78
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#define RELOC_BITS3_TYPE_SH_LITTLE 3
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#define RELOC_BITS3_EXTERN_BIG 0x01
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#define RELOC_BITS3_EXTERN_LITTLE 0x80
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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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/* 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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/* 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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#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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#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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/********************** 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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