ti.h

这个是LINUX下的GDB调度工具的源码

/* 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))
#define PUT_SCNHDR_SIZE(ABFD, SZ, SZP) \
  H_PUT_32 (ABFD, (SZ) / bfd_octets_per_byte (ABFD), SZP)

#define COFF_ADJUST_SCNHDR_IN_POST(ABFD, EXT, INT) \
  do									\
    {									\
      ((struct internal_scnhdr *)(INT))->s_page =			\
	GET_SCNHDR_PAGE (ABFD, ((SCNHDR *)(EXT))->s_page);		\
    }									\
   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		*/
};

#define	LINENO	struct external_lineno
#define	LINESZ	6


/********************** SYMBOLS **********************/

/* 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 */

struct external_syment 
{
  union {
    char e_name[E_SYMNMLEN];
    struct {
      char e_zeroes[4];
      char e_offset[4];
    } e;
  } e;
  char e_value[4];
  char e_scnum[2];
  char e_type[2];
  char e_sclass[1];
  char e_numaux[1];
};


#define N_BTMASK	(017)
#define N_TMASK		(060)
#define N_BTSHFT	(4)
#define N_TSHIFT	(2)
  

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;
  
  union {
	char x_fname[E_FILNMLEN];
	struct {
	  char x_zeroes[4];
	  char x_offset[4];
	} x_n;
  } x_file;
  
  struct {
	char x_scnlen[4];			/* section length */
	char x_nreloc[2];	/* # relocation entries */
	char x_nlinno[2];	/* # line numbers */
  } x_scn;
  
  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)) */
  

};

#define	SYMENT	struct external_syment
#define	SYMESZ	18	
#define	AUXENT	union external_auxent
#define	AUXESZ	18

/* section lengths are in target bytes (not host bytes) */
#define GET_SCN_SCNLEN(ABFD, EXT) \
  (H_GET_32 (ABFD, (EXT)->x_scn.x_scnlen) * bfd_octets_per_byte (ABFD))
#define PUT_SCN_SCNLEN(ABFD, INT, EXT) \
  H_PUT_32 (ABFD, (INT) / bfd_octets_per_byte (ABFD), (EXT)->x_scn.x_scnlen)

/* lnsz size is in bits in COFF file, in bytes in BFD */
#define GET_LNSZ_SIZE(abfd, ext) \
 (H_GET_16 (abfd, ext->x_sym.x_misc.x_lnsz.x_size) / (class != C_FIELD ? 8 : 1))

#define PUT_LNSZ_SIZE(abfd, in, ext) \
  H_PUT_16 (abfd, ((class != C_FIELD) ? (in) * 8 : (in)), \
	   ext->x_sym.x_misc.x_lnsz.x_size)
 
/* 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)

#define COFF_ADJUST_SYM_OUT_POST(ABFD, INT, EXT) \
  do									\
    {									\
       struct internal_syment *src = (struct internal_syment *)(INT);	\
       SYMENT *dst = (SYMENT *)(EXT);					\
       if (src->n_sclass == C_MOU || src->n_sclass == C_MOS)		\
	 H_PUT_32 (abfd, src->n_value * 8, dst->e_value);		\
       else if (NEEDS_PAGE (src->n_sclass)) {                           \
         H_PUT_32 (abfd, src->n_value &= ~PAGE_MASK, dst->e_value);     \
       }								\
    }									\
   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')

/********************** RELOCATION DIRECTIVES **********************/

struct external_reloc_v0
{
  char r_vaddr[4];
  char r_symndx[2];
  char r_reserved[2];
  char r_type[2];
};

struct external_reloc
{
  char r_vaddr[4];
  char r_symndx[4];
  char r_reserved[2]; /* extended pmad byte for COFF2 */
  char r_type[2];
};

#define RELOC struct external_reloc
#define RELSZ_V0 10                 /* FIXME -- coffcode.h needs fixing */
#define RELSZ 12                    /* for COFF1/2 */

/* various relocation types.  */
#define R_ABS     0x0000            /* no relocation */
#define R_REL13   0x002A            /* 13-bit direct reference (???) */
#define R_PARTLS7 0x0028            /* 7 LSBs of an address */
#define R_PARTMS9 0x0029            /* 9MSBs of an address */
#define R_EXTWORD 0x002B            /* 23-bit direct reference */
#define R_EXTWORD16 0x002C          /* 16-bit direct reference to 23-bit addr*/
#define R_EXTWORDMS7 0x002D         /* upper 7 bits of 23-bit address */

#endif /* COFF_TI_H */