1 2 .EXTERN MY_LABEL2; 3 .section .text; 4 5 // 6 //2 Program Flow Control 7 // 8 9 10 //JUMP ( Preg ) ; /* indirect to an absolute (not PC-relative)address (a) */ 11 //Preg: P5-0, SP, FP 12 13 JUMP (P0); 14 JUMP (P1); 15 JUMP (P2); 16 JUMP (P3); 17 JUMP (P4); 18 JUMP (P5); 19 JUMP (SP); 20 JUMP (FP); 21 22 //JUMP ( PC + Preg ) ; /* PC-relative, indexed (a) */ 23 JUMP (PC+P0); 24 JUMP (PC+P1); 25 JUMP (PC+P2); 26 JUMP (PC+P3); 27 JUMP (PC+P4); 28 JUMP (PC+P5); 29 JUMP (PC+SP); 30 JUMP (PC+FP); 31 32 33 //JUMP pcrelm2 ; /* PC-relative, immediate (a) or (b) */ 34 35 JUMP 0X0; 36 JUMP 1234; 37 JUMP -1234; 38 JUMP 2; 39 JUMP -2; 40 41 MY_LABEL1: 42 //JUMP.S pcrel13m2 ; /* PC-relative, immediate, short (a) */ 43 JUMP.S 0X0; 44 JUMP.S 1234; 45 JUMP.S -1234; 46 JUMP.S 2; 47 JUMP.S -2; 48 49 //JUMP.L pcrel25m2 ; /* PC-relative, immediate, long (b) */ 50 JUMP.L 0XFF800000; 51 JUMP.L 0X007FFFFE; 52 JUMP.L 0X0; 53 JUMP.L 1234; 54 JUMP.L -1234; 55 JUMP.L 2; 56 JUMP.L -2; 57 58 //JUMP user_label ; /* user-defined absolute address label, */ 59 JUMP MY_LABEL1; 60 JUMP MY_LABEL2; 61 62 JUMP MY_LABEL1-2; 63 JUMP MY_LABEL2-2; 64 65 //IF CC JUMP pcrel11m2 ; /* branch if CC=1, branch predicted as not taken (a) */ 66 IF CC JUMP 0xFFFFFE08; 67 IF CC JUMP 0x0B4; 68 IF CC JUMP 0; 69 70 //IF CC JUMP pcrel11m2 (bp) ; /* branch if CC=1, branch predicted as taken (a) */ 71 IF CC JUMP 0xFFFFFE08(bp); 72 IF CC JUMP 0x0B4(bp); 73 74 //IF !CC JUMP pcrel11m2 ; /* branch if CC=0, branch predicted as not taken (a) */ 75 IF !CC JUMP 0xFFFFFF22; 76 IF !CC JUMP 0X120; 77 78 //IF !CC JUMP pcrel11m2 (bp) ; /* branch if CC=0, branch predicted as taken (a) */ 79 IF !CC JUMP 0xFFFFFF22(bp); 80 IF !CC JUMP 0X120(bp); 81 82 //IF CC JUMP user_label ; /* user-defined absolute address label, resolved by the assembler/linker to the appropriate PC-relative instruction (a) */ 83 IF CC JUMP MY_LABEL1; 84 IF CC JUMP MY_LABEL2; 85 86 //IF CC JUMP user_label (bp) ; /* user-defined absolute address label, resolved by the assembler/linker to the appropriate PC-relative instruction (a) */ 87 IF CC JUMP MY_LABEL1(bp); 88 IF CC JUMP MY_LABEL2(bp); 89 90 //IF !CC JUMP user_label ; /* user-defined absolute address label, resolved by the assembler/linker to the appropriate PC-relative instruction (a) */ 91 IF !CC JUMP MY_LABEL1; 92 IF !CC JUMP MY_LABEL2; 93 94 //IF !CC JUMP user_label (bp) ; /* user-defined absolute address label, resolved by the assembler/linker to the appropriate PC-relative instruction (a) */ 95 IF !CC JUMP MY_LABEL1(bp); 96 IF !CC JUMP MY_LABEL2(bp); 97 98 //CALL ( Preg ) ; /* indirect to an absolute (not PC-relative) address (a) */ 99 CALL(P0); 100 CALL(P1); 101 CALL(P2); 102 CALL(P3); 103 CALL(P4); 104 CALL(P5); 105 106 107 //CALL ( PC + Preg ) ; /* PC-relative, indexed (a) */ 108 CALL(PC+P0); 109 CALL(PC+P1); 110 CALL(PC+P2); 111 CALL(PC+P3); 112 CALL(PC+P4); 113 CALL(PC+P5); 114 115 //CALL pcrel25m2 ; /* PC-relative, immediate (b) */ 116 CALL 0x123456 ; 117 CALL -1234; 118 119 //CALL user_label ; /* user-defined absolute address label,resolved by the assembler/linker to the appropriate PC-relative instruction (a) or (b) */ 120 CALL MY_LABEL1; 121 CALL MY_LABEL2; 122 123 RTS ; // Return from Subroutine (a) 124 RTI ; // Return from Interrupt (a) 125 RTX ; // Return from Exception (a) 126 RTN ; // Return from NMI (a) 127 RTE ; // Return from Emulation (a) 128 129 lsetup ( 4, 4 ) lc0 ; 130 131 lsetup ( beg_poll_bit, end_poll_bit ) lc0 ; 132 NOP;NOP; 133 beg_poll_bit: R0=1(Z); 134 end_poll_bit: R1=2(Z); 135 136 lsetup ( 4, 6 ) lc1 ; 137 138 lsetup ( FIR_filter, bottom_of_FIR_filter ) lc1 ; 139 NOP; 140 FIR_filter: R0=1(Z); 141 bottom_of_FIR_filter: R1=2(Z); 142 143 lsetup ( 4, 8 ) lc0 = p1 ; 144 145 lsetup ( 4, 8 ) lc0 = p1>>1 ; 146 147 loop DoItSome LC0 ; /* define loop DoItSome with Loop Counter 0 */ 148 loop_begin DoItSome ; /* place before the first instruction in the loop */ 149 R0=1; 150 R1=2; 151 loop_end DoItSome ; /* place after the last instruction in the loop */ 152 153 loop DoItSomeMore LC1 ; /* define loop MyLoop with Loop Counter 1*/ 154 155 156
