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Annotation of GNUtools/cctools/include/mach-o/i860/reloc.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Relocation types used in the I860 implementation.  Relocation entries for
                      3:  * things other than instructions use the same generic relocation as discribed
                      4:  * above and their r_type is RELOC_VANILLA.  The rest of the relocation types
                      5:  * are for instructions.  Since they are for instructions the r_address field
                      6:  * indicates the 32 bit instruction that the relocation is to be preformed on.
                      7:  * The fields r_pcrel and r_length are ignored for non-RELOC_VANILLA r_types
                      8:  * except RELOC_SPLIT0 as discribed below.
                      9:  */
                     10: enum reloc_type_i860
                     11: {
                     12:     I860_RELOC_VANILLA,        /* generic relocation as discribed above */
                     13: 
                     14:     I860_RELOC_PAIR,   /* Only follows a I860_RELOC_HIGH or a
                     15:                         * I860_RELOC_HIGHADJ and only the r_address has any
                     16:                         * meaning.
                     17:                         */ 
                     18:     I860_RELOC_HIGH,   /* The low 16 bits of the instruction contains the high
                     19:                         * 16 bits of the item being refered to.  This
                     20:                         * relocation type must be followed by a I860_RELOC_PAIR
                     21:                         * relocation type.  The low 16 bits of the item being
                     22:                         * refered to is stored in the r_address of the
                     23:                         * I860_RELOC_PAIR entry.
                     24:                         */
                     25:     I860_RELOC_LOW0,   /* For all of these the low 16 bits of the instruction*/
                     26:     I860_RELOC_LOW1,   /* (minus the low 0, 1, 2, 3, or 4 bits) contain the  */
                     27:     I860_RELOC_LOW2,   /* low 16 bits of the item being refered to.  The bits*/
                     28:     I860_RELOC_LOW3,   /* of the reference that are missing are 0 and the    */
                     29:     I860_RELOC_LOW4,   /* bits in the instruction are part of the encoding of*/
                     30:                        /* instruction.  The resulting low 16 bits of the item*/
                     31:                        /* being refered to is sign extended to 32 bits.      */
                     32: 
                     33:     I860_RELOC_SPLIT0, /* For all of these the bits 20-14 and bits 10-0 of   */
                     34:     I860_RELOC_SPLIT1, /* the instruction (minus the low 0, 1 or 2 bits)     */
                     35:     I860_RELOC_SPLIT2, /* contain the low 16 bits of the item to being       */
                     36:                        /* refered to.  The bits of the reference that are    */
                     37:                        /* missing are 0 and the bits of the instruction are  */
                     38:                        /* part of the encoding of the instruction.  The      */
                     39:                        /* resulting low 16 bits of the item being relocated  */
                     40:                        /* is sign extened to 32 bits.  A special case of the */
                     41:                        /* I860_RELOC_SPLIT0 is when r_pcrel is non-zero (for */
                     42:                        /* branch displacements).  In this case the 16 bits   */
                     43:                        /* from the instruction is a 32 bit word displacement.*/
                     44: 
                     45:     I860_RELOC_HIGHADJ,        /* Same as the RELOC_HIGH except the low 16 bits and the
                     46:                         * high 16 bits are added together with the low 16 bits
                     47:                         * sign extened first.  This means if bit 15 of the low
                     48:                         * 16 bits is set the high 16 bits stored in the
                     49:                         * instruction will be adjusted.
                     50:                         */
                     51:     I860_RELOC_BRADDR, /* The low 26 bits of the instruction is a 32 bit
                     52:                         * word displacement from the pc to the item to being
                     53:                         * refered to.
                     54:                         */
                     55:     I860_RELOC_SECTDIFF /* a PAIR follows with subtract symbol value */
                     56: };

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