From 0fa4f690d6d05dd3b217a004d5f699deaf00c427 Mon Sep 17 00:00:00 2001 From: John Gilmore Date: Wed, 16 Oct 1991 18:57:16 +0000 Subject: [PATCH] * host-aout.c: New strategy. We use common code, include files, and data structures to handle the file, but set a few parameters from the host's config file (page size, text start addr, etc). * libaout.h: Define HP BSD machine types. --- bfd/libaout.h | 130 ++++++++++++++++++++++++++++++++++++++++++++-------------- 1 file changed, 100 insertions(+), 30 deletions(-) diff --git a/bfd/libaout.h b/bfd/libaout.h index 269dd41..0797bc5 100644 --- a/bfd/libaout.h +++ b/bfd/libaout.h @@ -48,21 +48,74 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #define BYTES_IN_WORD 4 #endif -#define adata(bfd) ((struct aoutdata *) ((bfd)->tdata)) -#define exec_hdr(bfd) (adata(bfd)->hdr) -#define obj_textsec(bfd) (adata(bfd)->textsec) -#define obj_datasec(bfd) (adata(bfd)->datasec) -#define obj_bsssec(bfd) (adata(bfd)->bsssec) -#define obj_sym_filepos(bfd) (adata(bfd)->sym_filepos) -#define obj_str_filepos(bfd) (adata(bfd)->str_filepos) - -#define obj_reloc_entry_size(bfd) (adata(bfd)->reloc_entry_size) - /* Declare these types at file level, since they are used in parameter lists, which have wierd scope. */ struct external_exec; struct internal_exec; +/* This is the layout in memory of a "struct exec" while we process it. + All 'lengths' are given as a number of bytes. + All 'alignments' are for relinkable files only; an alignment of + 'n' indicates the corresponding segment must begin at an + address that is a multiple of (2**n). */ + +struct internal_exec +{ + long a_info; /* Magic number and flags, packed */ + bfd_vma a_text; /* length of text, in bytes */ + bfd_vma a_data; /* length of data, in bytes */ + bfd_vma a_bss; /* length of uninitialized data area in mem */ + bfd_vma a_syms; /* length of symbol table data in file */ + bfd_vma a_entry; /* start address */ + bfd_vma a_trsize; /* length of text's relocation info, in bytes */ + bfd_vma a_drsize; /* length of data's relocation info, in bytes */ + /* Added for i960 */ + bfd_vma a_tload; /* Text runtime load address */ + bfd_vma a_dload; /* Data runtime load address */ + unsigned char a_talign; /* Alignment of text segment */ + unsigned char a_dalign; /* Alignment of data segment */ + unsigned char a_balign; /* Alignment of bss segment */ +}; + +/* Magic number is written +< MSB > +3130292827262524232221201918171615141312111009080706050403020100 +< FLAGS >< MACHINE TYPE >< MAGIC NUMBER > +*/ +enum machine_type { + M_UNKNOWN = 0, + M_68010 = 1, + M_68020 = 2, + M_SPARC = 3, + /* skip a bunch so we dont run into any of suns numbers */ + M_386 = 100, + M_29K = 101, + M_HP200 = 200, /* HP 200 (68010) BSD binary */ + M_HP300 = (300 % 256), /* HP 300 (68020+68881) BSD binary */ + M_HPUX = (0x20c % 256),/* HP 200/300 HPUX binary */ +}; + +#define N_DYNAMIC(exec) ((exec).a_info & 0x8000000) + +#define N_MAGIC(exec) ((exec).a_info & 0xffff) +#define N_MACHTYPE(exec) ((enum machine_type)(((exec).a_info >> 16) & 0xff)) +#define N_FLAGS(exec) (((exec).a_info >> 24) & 0xff) +#define N_SET_INFO(exec, magic, type, flags) \ +((exec).a_info = ((magic) & 0xffff) \ + | (((int)(type) & 0xff) << 16) \ + | (((flags) & 0xff) << 24)) + +#define N_SET_MAGIC(exec, magic) \ +((exec).a_info = (((exec).a_info & 0xffff0000) | ((magic) & 0xffff))) + +#define N_SET_MACHTYPE(exec, machtype) \ +((exec).a_info = \ + ((exec).a_info&0xff00ffff) | ((((int)(machtype))&0xff) << 16)) + +#define N_SET_FLAGS(exec, flags) \ +((exec).a_info = \ + ((exec).a_info&0x00ffffff) | (((flags) & 0xff) << 24)) + typedef struct aout_symbol { asymbol symbol; short desc; @@ -70,10 +123,13 @@ typedef struct aout_symbol { unsigned char type; } aout_symbol_type; +/* The `tdata' struct for all a.out-like object file formats. + Various things depend on this struct being around any time an a.out + file is being handled. An example is dbxread.c in GDB. */ + struct aoutdata { - struct internal_exec *hdr; /* exec file header */ + struct internal_exec *hdr; /* exec file header */ aout_symbol_type *symbols; /* symtab for input bfd */ - /* For ease, we do this */ asection *textsec; @@ -85,29 +141,42 @@ struct aoutdata { file_ptr sym_filepos; file_ptr str_filepos; - /* Size of a relocation entry */ + /* Size of a relocation entry in external form */ unsigned reloc_entry_size; -}; + /* Size of a symbol table entry in external form */ + unsigned symbol_entry_size; -#define obj_outsymbols(bfd) ((PTR)(((struct aoutdata *) ((bfd)->tdata))->outsymbols)) + /* Page size - needed for alignment of demand paged files. */ + unsigned long page_size; + /* Segment size - needed for alignment of demand paged files. */ + unsigned long segment_size; -/* We take the address of the first element of an asymbol to ensure that the - * macro is only ever applied to an asymbol */ -#define aout_symbol(asymbol) ((aout_symbol_type *)(&(asymbol)->the_bfd)) + unsigned exec_bytes_size; +}; -/*#define obj_symbols(bfd) ((((struct aoutdata *) ((bfd)->tdata))->symbols))*/ -#define obj_aout_symbols(bfd) ((((struct aoutdata *) (bfd)->tdata))->symbols) -#define obj_arch_flags(bfd) ((((struct aoutdata *) (bfd)->tdata))->arch_flags) +#define adata(bfd) ((struct aoutdata *) ((bfd)->tdata)) +#define exec_hdr(bfd) (adata(bfd)->hdr) +#define obj_aout_symbols(bfd) (adata(bfd)->symbols) +#define obj_textsec(bfd) (adata(bfd)->textsec) +#define obj_datasec(bfd) (adata(bfd)->datasec) +#define obj_bsssec(bfd) (adata(bfd)->bsssec) +#define obj_sym_filepos(bfd) (adata(bfd)->sym_filepos) +#define obj_str_filepos(bfd) (adata(bfd)->str_filepos) +#define obj_reloc_entry_size(bfd) (adata(bfd)->reloc_entry_size) +#define obj_symbol_entry_size(bfd) (adata(bfd)->symbol_entry_size) -#define get_tdata(x) ((struct aoutdata *)((x)->tdata)) +/* We take the address of the first element of an asymbol to ensure that the + macro is only ever applied to an asymbol */ +#define aout_symbol(asymbol) ((aout_symbol_type *)(&(asymbol)->the_bfd)) /* Prototype declarations for functions defined in aoutx.h */ PROTO (boolean, NAME(aout,squirt_out_relocs),(bfd *abfd, asection *section)); PROTO (bfd_target *, NAME(aout,some_aout_object_p), (bfd *abfd, + struct internal_exec *execp, bfd_target *(*callback)())); PROTO (boolean, NAME(aout,mkobject), (bfd *abfd)); PROTO (enum machine_type, NAME(aout,machine_type), (enum bfd_architecture arch, @@ -157,6 +226,7 @@ PROTO (void, NAME(aout,swap_exec_header_out),(bfd *abfd, struct internal_exec *e /* Calculate the file positions of the parts of a newly read aout header */ #define WORK_OUT_FILE_POSITIONS(abfd, execp) \ + /* The virtual memory addresses of the sections */ \ obj_datasec (abfd)->vma = N_DATADDR(*execp); \ obj_bsssec (abfd)->vma = N_BSSADDR(*execp); \ obj_textsec (abfd)->vma = N_TXTADDR(*execp); \ @@ -176,13 +246,13 @@ PROTO (void, NAME(aout,swap_exec_header_out),(bfd *abfd, struct internal_exec *e #define WRITE_HEADERS(abfd, execp) \ { \ - if ((obj_textsec(abfd)->vma & 0xff )== EXEC_BYTES_SIZE) \ - abfd->flags |= D_PAGED; \ - else \ - abfd->flags &= ~D_PAGED; \ if (abfd->flags & D_PAGED) \ { \ - execp->a_text = obj_textsec (abfd)->size + EXEC_BYTES_SIZE; \ + execp->a_text = obj_textsec (abfd)->size; \ + /* Kludge to distinguish old- and new-style ZMAGIC. \ + The latter includes the exec header in the text size. */ \ + if (obj_textsec(abfd)->filepos == EXEC_BYTES_SIZE) \ + execp->a_text += EXEC_BYTES_SIZE; \ N_SET_MAGIC (*execp, ZMAGIC); \ } \ else \ @@ -195,8 +265,8 @@ PROTO (void, NAME(aout,swap_exec_header_out),(bfd *abfd, struct internal_exec *e } \ if (abfd->flags & D_PAGED) \ { \ - data_pad = ((obj_datasec(abfd)->size + PAGE_SIZE -1) \ - & (- PAGE_SIZE)) - obj_datasec(abfd)->size; \ + data_pad = ALIGN(obj_datasec(abfd)->size, PAGE_SIZE) \ + - obj_datasec(abfd)->size; \ \ if (data_pad > obj_bsssec(abfd)->size) \ execp->a_bss = 0; \ @@ -210,7 +280,7 @@ PROTO (void, NAME(aout,swap_exec_header_out),(bfd *abfd, struct internal_exec *e execp->a_bss = obj_bsssec (abfd)->size; \ } \ \ - execp->a_syms = bfd_get_symcount (abfd) * EXTERNAL_LIST_SIZE; \ + execp->a_syms = bfd_get_symcount (abfd) * EXTERNAL_NLIST_SIZE; \ execp->a_entry = bfd_get_start_address (abfd); \ \ execp->a_trsize = ((obj_textsec (abfd)->reloc_count) * \ -- 2.7.4