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Diffstat (limited to 'include/aout/encap.h')
| -rw-r--r-- | include/aout/encap.h | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/include/aout/encap.h b/include/aout/encap.h new file mode 100644 index 0000000..cebedf3 --- /dev/null +++ b/include/aout/encap.h @@ -0,0 +1,135 @@ +/* Yet Another Try at encapsulating bsd object files in coff. + Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc. + Written by Pace Willisson 12/9/88 + + This file is obsolete. It needs to be converted to just define a bunch + of stuff that BFD can use to do coff-encapsulated files. --gnu@cygnus.com + +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 2 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* + * We only use the coff headers to tell the kernel + * how to exec the file. Therefore, the only fields that need to + * be filled in are the scnptr and vaddr for the text and data + * sections, and the vaddr for the bss. As far as coff is concerned, + * there is no symbol table, relocation, or line numbers. + * + * A normal bsd header (struct exec) is placed after the coff headers, + * and before the real text. I defined a the new fields 'a_machtype' + * and a_flags. If a_machtype is M_386, and a_flags & A_ENCAP is + * true, then the bsd header is preceeded by a coff header. Macros + * like N_TXTOFF and N_TXTADDR use this field to find the bsd header. + * + * The only problem is to track down the bsd exec header. The + * macros HEADER_OFFSET, etc do this. + */ + +#define N_FLAGS_COFF_ENCAPSULATE 0x20 /* coff header precedes bsd header */ + +/* Describe the COFF header used for encapsulation. */ + +struct coffheader +{ + /* filehdr */ + unsigned short f_magic; + unsigned short f_nscns; + long f_timdat; + long f_symptr; + long f_nsyms; + unsigned short f_opthdr; + unsigned short f_flags; + /* aouthdr */ + short magic; + short vstamp; + long tsize; + long dsize; + long bsize; + long entry; + long text_start; + long data_start; + struct coffscn + { + char s_name[8]; + long s_paddr; + long s_vaddr; + long s_size; + long s_scnptr; + long s_relptr; + long s_lnnoptr; + unsigned short s_nreloc; + unsigned short s_nlnno; + long s_flags; + } scns[3]; +}; + +/* Describe some of the parameters of the encapsulation, + including how to find the encapsulated BSD header. */ + +/* FIXME, this is dumb. The same tools can't handle a.outs for different + architectures, just because COFF_MAGIC is different; so you need a + separate GNU nm for every architecture!!? Unfortunately, it needs to + be this way, since the COFF_MAGIC value is determined by the kernel + we're trying to fool here. */ + +#define COFF_MAGIC_I386 0514 /* I386MAGIC */ +#define COFF_MAGIC_M68K 0520 /* MC68MAGIC */ +#define COFF_MAGIC_A29K 0x17A /* Used by asm29k cross-tools */ + +#ifdef COFF_MAGIC +short __header_offset_temp; +#define HEADER_OFFSET(f) \ + (__header_offset_temp = 0, \ + fread ((char *)&__header_offset_temp, sizeof (short), 1, (f)), \ + fseek ((f), -sizeof (short), 1), \ + __header_offset_temp==COFF_MAGIC ? sizeof(struct coffheader) : 0) +#else +#define HEADER_OFFSET(f) 0 +#endif + +#define HEADER_SEEK(f) (fseek ((f), HEADER_OFFSET((f)), 1)) + +/* Describe the characteristics of the BSD header + that appears inside the encapsulation. */ + +/* Encapsulated coff files that are linked ZMAGIC have a text segment + offset just past the header (and a matching TXTADDR), excluding + the headers from the text segment proper but keeping the physical + layout and the virtual memory layout page-aligned. + + Non-encapsulated a.out files that are linked ZMAGIC have a text + segment that starts at 0 and an N_TXTADR similarly offset to 0. + They too are page-aligned with each other, but they include the + a.out header as part of the text. + + The _N_HDROFF gets sizeof struct exec added to it, so we have + to compensate here. See <a.out.gnu.h>. */ + +#undef _N_HDROFF +#undef N_TXTADDR +#undef N_DATADDR + +#define _N_HDROFF(x) ((N_FLAGS(x) & N_FLAGS_COFF_ENCAPSULATE) ? \ + sizeof (struct coffheader) : 0) + +/* Address of text segment in memory after it is loaded. */ +#define N_TXTADDR(x) \ + ((N_FLAGS(x) & N_FLAGS_COFF_ENCAPSULATE) ? \ + sizeof (struct coffheader) + sizeof (struct exec) : 0) +#define SEGMENT_SIZE 0x400000 + +#define N_DATADDR(x) \ + ((N_FLAGS(x) & N_FLAGS_COFF_ENCAPSULATE) ? \ + (SEGMENT_SIZE + ((N_TXTADDR(x)+(x).a_text-1) & ~(SEGMENT_SIZE-1))) : \ + (N_TXTADDR(x)+(x).a_text)) |