/* COFF information for TI COFF support. Definitions in this file should be
customized in a target-specific file, and then this file included (see
tic54x.h for an example).
Copyright (C) 2000-2024 Free Software Foundation, Inc.
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 3 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., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#ifndef COFF_TI_H
#define COFF_TI_H
/* Note "coff/external.h is not used because TI adds extra fields to the structures. */
struct external_filehdr
{
char f_magic[2]; /* magic number */
char f_nscns[2]; /* number of sections */
char f_timdat[4]; /* time & date stamp */
char f_symptr[4]; /* file pointer to symtab */
char f_nsyms[4]; /* number of symtab entries */
char f_opthdr[2]; /* sizeof(optional hdr) */
char f_flags[2]; /* flags */
char f_target_id[2]; /* magic no. (TI COFF-specific) */
};
/* COFF0 has magic number in f_magic, and omits f_target_id from the file
header; for later versions, f_magic is 0xC1 for COFF1 and 0xC2 for COFF2
and the target-specific magic number is found in f_target_id */
/* The target_id field changes depending on the particular CPU target */
/* for COFF0, the target id appeared in f_magic, where COFFX magic is now */
#ifndef TI_TARGET_ID
#error "TI_TARGET_ID needs to be defined for your CPU"
#endif
/* Which bfd_arch to use... */
#ifndef TICOFF_TARGET_ARCH
#error "TICOFF_TARGET_ARCH needs to be defined for your CPU"
#endif
/* Default to COFF2 for file output */
#ifndef TICOFF_DEFAULT_MAGIC
#define TICOFF_DEFAULT_MAGIC TICOFF2MAGIC
#endif
/* This value is made available in the rare case where a bfd is unavailable */
#ifndef OCTETS_PER_BYTE_POWER
#error "OCTETS_PER_BYTE_POWER not defined for this CPU"
#else
#define OCTETS_PER_BYTE (1<<OCTETS_PER_BYTE_POWER)
#endif
/* default alignment is on a byte (not octet!) boundary */
#ifndef COFF_DEFAULT_SECTION_ALIGNMENT_POWER
#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 0
#endif
/* TI COFF encodes the section alignment in the section header flags */
#define COFF_ALIGN_IN_SECTION_HEADER 1
#define COFF_ALIGN_IN_S_FLAGS 1
/* requires a power-of-two argument */
#define COFF_ENCODE_ALIGNMENT(B,S,X) \
((S).s_flags |= (((unsigned) (X) & 0xF) << 8), true)
/* result is a power of two */
#define COFF_DECODE_ALIGNMENT(X) (((X) >> 8) & 0xF)
/* we need to read/write an extra field in the coff file header */
#ifndef COFF_ADJUST_FILEHDR_IN_POST
#define COFF_ADJUST_FILEHDR_IN_POST(abfd, src, dst) \
do \
{ \
if (!COFF0_P (abfd)) \
((struct internal_filehdr *)(dst))->f_target_id = \
H_GET_16 (abfd, ((FILHDR *)(src))->f_target_id); \
} \
while (0)
#endif
#ifndef COFF_ADJUST_FILEHDR_OUT_POST
#define COFF_ADJUST_FILEHDR_OUT_POST(abfd, src, dst) \
do \
{ \
if (!COFF0_P (abfd)) \
H_PUT_16 (abfd, ((struct internal_filehdr *)(src))->f_target_id, \
((FILHDR *)(dst))->f_target_id); \
} \
while (0)
#endif
typedef struct
{
char magic[2]; /* type of file (0x108) */
char vstamp[2]; /* version stamp */
char tsize[4]; /* text size in bytes, padded to FW bdry*/
char dsize[4]; /* initialized data " " */
char bsize[4]; /* uninitialized data " " */
char entry[4]; /* entry pt. */
char text_start[4]; /* base of text used for this file */
char data_start[4]; /* base of data used for this file */
}
AOUTHDR;
#define AOUTHDRSZ 28
#define AOUTSZ 28
/********************** SECTION HEADER **********************/
/* COFF0, COFF1 */
struct external_scnhdr_v01 {
char s_name[8]; /* section name */
char s_paddr[4]; /* physical address, aliased s_nlib */
char s_vaddr[4]; /* virtual address */
char s_size[4]; /* section size (in WORDS) */
char s_scnptr[4]; /* file ptr to raw data for section */
char s_relptr[4]; /* file ptr to relocation */
char s_lnnoptr[4]; /* file ptr to line numbers */
char s_nreloc[2]; /* number of relocation entries */
char s_nlnno[2]; /* number of line number entries*/
char s_flags[2]; /* flags */
char s_reserved[1]; /* reserved */
char s_page[1]; /* section page number (LOAD) */
};
/* COFF2 */
struct external_scnhdr {
char s_name[8]; /* section name */
char s_paddr[4]; /* physical address, aliased s_nlib */
char s_vaddr[4]; /* virtual address */
char s_size[4]; /* section size (in WORDS) */
char s_scnptr[4]; /* file ptr to raw data for section */
char s_relptr[4]; /* file ptr to relocation */
char s_lnnoptr[4]; /* file ptr to line numbers */
char s_nreloc[4]; /* number of relocation entries */
char s_nlnno[4]; /* number of line number entries*/
char s_flags[4]; /* flags */
char s_reserved[2]; /* reserved */
char s_page[2]; /* section page number (LOAD) */
};
/*
* Special section flags
*/
/* TI COFF defines these flags;
STYP_CLINK: the section should be excluded from the final
linker output if there are no references found to any symbol in the section
STYP_BLOCK: the section should be blocked, i.e. if the section would cross
a page boundary, it is started at a page boundary instead.
TI COFF puts the section alignment power of two in the section flags
e.g. 2**N is alignment, flags |= (N & 0xF) << 8
*/
#define STYP_CLINK (0x4000)
#define STYP_BLOCK (0x1000)
#define STYP_ALIGN (0x0F00) /* TI COFF stores section alignment here */
#define SCNHDR_V01 struct external_scnhdr_v01
#define SCNHDR struct external_scnhdr
#define SCNHSZ_V01 40 /* for v0 and v1 */
#define SCNHSZ 48
/* COFF2 changes the offsets and sizes of these fields
Assume we're dealing with the COFF2 scnhdr structure, and adjust
accordingly. Note: The GNU C versions of some of these macros
are necessary in order to avoid compile time warnings triggered
gcc's array bounds checking. The PUT_SCNHDR_PAGE macro also has
the advantage on not evaluating LOC twice. */
/* TI COFF stores section size as number of bytes (address units, not octets),
so adjust to be number of octets, which is what BFD expects */
#define GET_SCNHDR_SIZE(ABFD, SZP) \
(H_GET_32 (ABFD, SZP) * bfd_octets_per_byte (ABFD, NULL))
#define PUT_SCNHDR_SIZE(ABFD, SZ, SZP) \
H_PUT_32 (ABFD, (SZ) / bfd_octets_per_byte (ABFD, NULL), SZP)
/* The entire scnhdr may not be assigned.
Ensure that everything is initialized. */
#define COFF_ADJUST_SCNHDR_OUT_PRE(ABFD, INT, EXT) \
do \
{ \
memset((EXT), 0, sizeof (SCNHDR)); \
} \
while (0)
/* The line number and reloc overflow checking in coff_swap_scnhdr_out in
coffswap.h doesn't use PUT_X for s_nlnno and s_nreloc.
Due to different sized v0/v1/v2 section headers, we have to re-write these
fields.
*/
#define COFF_ADJUST_SCNHDR_OUT_POST(ABFD, INT, EXT) \
do \
{ \
PUT_SCNHDR_NLNNO (ABFD, ((struct internal_scnhdr *)(INT))->s_nlnno, \
((SCNHDR *)(EXT))->s_nlnno); \
PUT_SCNHDR_NRELOC (ABFD, ((struct internal_scnhdr *)(INT))->s_nreloc,\
((SCNHDR *)(EXT))->s_nreloc); \
PUT_SCNHDR_FLAGS (ABFD, ((struct internal_scnhdr *)(INT))->s_flags, \
((SCNHDR *)(EXT))->s_flags); \
PUT_SCNHDR_PAGE (ABFD, ((struct internal_scnhdr *)(INT))->s_page, \
((SCNHDR *)(EXT))->s_page); \
} \
while (0)
/*
* names of "special" sections
*/
#define _TEXT ".text"
#define _DATA ".data"
#define _BSS ".bss"
#define _CINIT ".cinit" /* initialized C data */
#define _SCONST ".const" /* constants */
#define _SWITCH ".switch" /* switch tables */
#define _STACK ".stack" /* C stack */
#define _SYSMEM ".sysmem" /* used for malloc et al. syscalls */
/********************** LINE NUMBERS **********************/
/* 1 line number entry for every "breakpointable" source line in a section.
* Line numbers are grouped on a per function basis; first entry in a function
* grouping will have l_lnno = 0 and in place of physical address will be the
* symbol table index of the function name.
*/
struct external_lineno {
union {
char l_symndx[4]; /* function name symbol index, iff l_lnno == 0*/
char l_paddr[4]; /* (physical) address of line number */
} l_addr;
char l_lnno[2]; /* line number */
};
/* NOTE: this is what a local label looks like in assembly source; what it
looks like in COFF output is undefined */
#define TICOFF_LOCAL_LABEL_P(NAME) \
((NAME[0] == '$' && NAME[1] >= '0' && NAME[1] <= '9' && NAME[2] == '\0') \
|| NAME[strlen(NAME)-1] == '?')
#define E_SYMNMLEN 8 /* # characters in a symbol name */
#define E_FILNMLEN 14 /* # characters in a file name */
#define E_DIMNUM 4 /* # array dimensions in auxiliary entry */
union external_auxent {
struct {
char x_tagndx[4]; /* str, un, or enum tag indx */
union {
struct {
char x_lnno[2]; /* declaration line number */
char x_size[2]; /* str/union/array size */
} x_lnsz;
char x_fsize[4]; /* size of function */
} x_misc;
union {
struct { /* if ISFCN, tag, or .bb */
char x_lnnoptr[4]; /* ptr to fcn line # */
char x_endndx[4]; /* entry ndx past block end */
} x_fcn;
struct { /* if ISARY, up to 4 dimen. */
char x_dimen[E_DIMNUM][2];
} x_ary;
} x_fcnary;
char x_tvndx[2]; /* tv index */
} x_sym;
struct {
char x_tvfill[4]; /* tv fill value */
char x_tvlen[2]; /* length of .tv */
char x_tvran[2][2]; /* tv range */
} x_tv; /* info about .tv section (in auxent of symbol .tv)) */
/* TI COFF stores offsets for MOS and MOU in bits; BFD expects bytes
Also put the load page flag of the section into the symbol value if it's an
address. */
#ifndef NEEDS_PAGE
#define NEEDS_PAGE(X) 0
#define PAGE_MASK 0
#endif
#define COFF_ADJUST_SYM_IN_POST(ABFD, EXT, INT) \
do \
{ \
struct internal_syment *dst = (struct internal_syment *)(INT); \
if (dst->n_sclass == C_MOS || dst->n_sclass == C_MOU) \
dst->n_value /= 8; \
else if (NEEDS_PAGE (dst->n_sclass)) { \
asection *scn = coff_section_from_bfd_index (abfd, dst->n_scnum); \
dst->n_value |= (scn->lma & PAGE_MASK); \
} \
} \
while (0)
/* Detect section-relative absolute symbols so they get flagged with a sym
index of -1.
*/
#define SECTION_RELATIVE_ABSOLUTE_SYMBOL_P(RELOC, SECT) \
((*(RELOC)->sym_ptr_ptr)->section->output_section == (SECT) \
&& (RELOC)->howto->name[0] == 'A')
