internal.h

早期freebsd实现

/*
 * Type of a symbol, in low N bits of the word
 */
#define T_NULL		0
#define T_VOID		1	/* function argument (only used by compiler) */
#define T_CHAR		2	/* character		*/
#define T_SHORT		3	/* short integer	*/
#define T_INT		4	/* integer		*/
#define T_LONG		5	/* long integer		*/
#define T_FLOAT		6	/* floating point	*/
#define T_DOUBLE	7	/* double word		*/
#define T_STRUCT	8	/* structure 		*/
#define T_UNION		9	/* union 		*/
#define T_ENUM		10	/* enumeration 		*/
#define T_MOE		11	/* member of enumeration*/
#define T_UCHAR		12	/* unsigned character	*/
#define T_USHORT	13	/* unsigned short	*/
#define T_UINT		14	/* unsigned integer	*/
#define T_ULONG		15	/* unsigned long	*/
#define T_LNGDBL	16	/* long double		*/

/*
 * derived types, in n_type
*/
#define DT_NON		(0)	/* no derived type */
#define DT_PTR		(1)	/* pointer */
#define DT_FCN		(2)	/* function */
#define DT_ARY		(3)	/* array */

#define BTYPE(x)	((x) & N_BTMASK)

#define ISPTR(x)	(((x) & N_TMASK) == (DT_PTR << N_BTSHFT))
#define ISFCN(x)	(((x) & N_TMASK) == (DT_FCN << N_BTSHFT))
#define ISARY(x)	(((x) & N_TMASK) == (DT_ARY << N_BTSHFT))
#define ISTAG(x)	((x)==C_STRTAG||(x)==C_UNTAG||(x)==C_ENTAG)
#define DECREF(x) ((((x)>>N_TSHIFT)&~N_BTMASK)|((x)&N_BTMASK))


union internal_auxent 
{
  struct {

    union {
      long l;			/* str, un, or enum tag indx */
      struct coff_ptr_struct *p;
    } x_tagndx;

    union {
      struct {
	unsigned short x_lnno;	/* declaration line number */
	unsigned short x_size;	/* str/union/array size */
      } x_lnsz;
      long x_fsize;		/* size of function */
    } x_misc;

    union {
      struct {			/* if ISFCN, tag, or .bb */
	long x_lnnoptr;		/* ptr to fcn line # */
	union { 		/* entry ndx past block end */
	  long  l;
	  struct coff_ptr_struct *p;
	} x_endndx;
      } x_fcn;

      struct {			/* if ISARY, up to 4 dimen. */
	unsigned short x_dimen[DIMNUM];
      } x_ary;
    } x_fcnary;

    unsigned short x_tvndx;	/* tv index */
  } x_sym;

  union {
    char x_fname[FILNMLEN];
    struct {
      long x_zeroes;
      long x_offset;
    } x_n;
  } x_file;

  struct {
    long x_scnlen;		/* section length */
    unsigned short x_nreloc;	/* # relocation entries */
    unsigned short x_nlinno;	/* # line numbers */
  } x_scn;

  struct {
    long		x_tvfill; /* tv fill value */
    unsigned short	x_tvlen; /* length of .tv */
    unsigned short	x_tvran[2]; /* tv range */
  } x_tv;		/* info about .tv section (in auxent of symbol .tv)) */

  /******************************************
   * RS/6000-specific auxent - last auxent for every external symbol
   ******************************************/
  struct {
    long            x_scnlen;       /* csect length */
    long            x_parmhash;     /* parm type hash index */
    unsigned short  x_snhash;       /* sect num with parm hash */
    unsigned char   x_smtyp;        /* symbol align and type */
				    /* 0-4 - Log 2 of alignment */
				    /* 5-7 - symbol type */
    unsigned char   x_smclas;       /* storage mapping class */
    long            x_stab;         /* dbx stab info index */
    unsigned short  x_snstab;       /* sect num with dbx stab */
  } x_csect; /* csect definition information */

/* x_smtyp values:  */

#define	SMTYP_ALIGN(x)	((x) >> 3)	/* log2 of alignment */
#define	SMTYP_SMTYP(x)	((x) & 0x7)	/* symbol type */
/* Symbol type values:  */
#define	XTY_ER	0	/* External reference */
#define	XTY_SD	1	/* Csect definition */
#define	XTY_LD	2	/* Label definition */
#define XTY_CM	3	/* .BSS */
#define	XTY_EM	4	/* Error message */
#define	XTY_US	5	/* "Reserved for internal use" */

/* x_smclas values:  */

#define	XMC_PR	0	/* Read-only program code */
#define	XMC_RO	1	/* Read-only constant */
#define	XMC_DB	2	/* Read-only debug dictionary table */
#define	XMC_TC	3	/* Read-write general TOC entry */
#define	XMC_UA	4	/* Read-write unclassified */
#define	XMC_RW	5	/* Read-write data */
#define	XMC_GL	6	/* Read-only global linkage */
#define	XMC_XO	7	/* Read-only extended operation (simulated insn) */
#define	XMC_SV	8	/* Read-only supervisor call */
#define	XMC_BS	9	/* Read-write BSS */
#define	XMC_DS	10	/* Read-write descriptor csect */
#define	XMC_UC	11	/* Read-write unnamed Fortran common */
#define	XMC_TI	12	/* Read-only traceback index csect */
#define	XMC_TB	13	/* Read-only traceback table csect */
/* 		14	??? */
#define	XMC_TC0	15	/* Read-write TOC anchor for TOC addressability */


  /******************************************
   *  I960-specific *2nd* aux. entry formats
   ******************************************/
  struct {
    /* This is a very old typo that keeps getting propagated. */
#define x_stdindx x_stindx
    long x_stindx;		/* sys. table entry */
  } x_sc;			/* system call entry */

  struct {
    unsigned long x_balntry;	/* BAL entry point */
  } x_bal;			/* BAL-callable function */

  struct {
    unsigned long	x_timestamp; /* time stamp */
    char 	x_idstring[20];	/* producer identity string */
  } x_ident;			/* Producer ident info */

};

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

struct internal_reloc 
{
	long r_vaddr;		/* Virtual address of reference */
	long r_symndx;		/* Index into symbol table	*/
	unsigned short r_type;	/* Relocation type		*/

#if RS6000COFF_C
	unsigned char  r_size;
#endif

	unsigned short r_offset;

};

#define R_RELBYTE	017
#define R_RELWORD	020
#define R_PCRBYTE	022
#define R_PCRWORD	023
#define R_PCRLONG	024

#define R_DIR32		06
#define	R_PCLONG	020
#define R_RELBYTE	017
#define R_RELWORD	020



#define R_PCR16L 128
#define R_PCR26L 129
#define R_VRT16  130
#define R_HVRT16 131
#define R_LVRT16 132
#define R_VRT32  133
#define R_RELLONG	(0x11)	/* Direct 32-bit relocation */
#define R_IPRSHORT	(0x18)
#define R_IPRMED 	(0x19)	/* 24-bit ip-relative relocation */
#define R_IPRLONG	(0x1a)
#define R_OPTCALL	(0x1b)	/* 32-bit optimizable call (leafproc/sysproc) */
#define R_OPTCALLX	(0x1c)	/* 64-bit optimizable call (leafproc/sysproc) */
#define R_GETSEG	(0x1d)
#define R_GETPA		(0x1e)
#define R_TAGWORD	(0x1f)
#define R_JUMPTARG	0x20	/* strange 29k 00xx00xx reloc */
#define R_MOVB1    0x41    /* Special h8 16bit or 8 bit reloc for  mov.b */
#define R_MOVB2    0x42    /* Special h8 opcode for 8bit which could
			      be 16 */
#define R_JMP1     0x43    /* Special h8 16bit jmp which could be
			      pcrel */
#define R_JMP2 0x44 /* a branch which used to be a jmp */
#define R_RELLONG_NEG  0x45


/* Z8k modes */
#define R_DA	  0x01	/* 16 bit Absolute direct address */
#define R_JR	  0x02	/* jr  8 bit disp */
#define R_IMM4L   0x23  /* low nibble */


#define R_CALL    R_DA /* Absolute address which could be a callr */
#define R_JP	  R_DA  /* Absolute address which could be a jp */

#define R_REL16   0x04  /* 16 bit PC rel */
#define R_CALLR	  0x05	/* callr 12 bit disp */

#define R_SEG     0x10  /* set if in segmented mode */


#define R_IMM32   0x21  /* 32 bit abs */
#define R_IMM8    0x22  /* 8 bit abs */

#define R_IMM4H   0x24  /* high nibble */