diff options
| -rw-r--r-- | test.subv | 40 |
1 files changed, 26 insertions, 14 deletions
@@ -1,31 +1,43 @@ == code 0x80000000 -main: - # load 0x10010000 (UART0) into t0 - 37/lui 5/rd/t0 0x10010/imm20 + # load mhartid CSR into t0, trap all but first Hart + 73/system 5/rd/t0 2/funct3/csrrs 0/rs/x0 f14/imm12/mhartid + 63/branch 1/subop/!= 5/rs/t0 0/rs/x0 0/off13 +main: # x4 = &message # . load high bits - 37/lui 4/rd/x4 Message/imm + 37/lui a/rd/a0 Message/imm20hi # . add low bits - 13/opi 0/subop/add 4/rd/x4 4/rs/x4 Message/imm + 13/opi 0/subop/add 4/rd/x4 a/rs/a0 Message/imm12lo + # call print + 6f/jal 1/rd/ra print/off21 +loop: + # infinite loop + 6f/jal 0/rd/x0 loop/off21 + +print: + # load 0x10010000 (UART0) into t0 + 37/lui 5/rd/t0 0x10010/imm20 print:loop: # load unsigned byte at x4 - 03/load 4/subop/lbu 6/rd/t1 4/rs/x4 0/imm12 + 03/load 4/subop/byte 6/rd/t1 a/rs/a0 0/imm12 # break loop if zero 63/branch 0/subop/== 6/rs/t1 0/rs/x0 print:break/off13 +print:spin: + # spin if FIFO is full + 03/load 2/subop/word 7/rd/t2 5/rs/t0 0/imm12 + 63/branch 4/subop/< 7/rs/t2 0/rs/x0 print:spin/off13 # print char - 23/store 2/subop/word 5/rs/t0 6/rs/t1 0/off12 + 23/store 2/width/word 5/rs/t0 6/rs/t1 0/off12 # increment x4 - 13/opi 0/subop/add 4/rd/x4 4/rs/x4 1/imm12 + 13/opi 0/subop/add a/rd/a0 a/rs/a0 1/imm12 # jump back up 6f/jal 0/rd/x0 print:loop/off21 print:break: + # return + 67/jalr 0/subop 0/rd/x0 1/rs/ra 0/off12 -loop: - # infinite loop - 6f/jal 0/rd/x0 loop/off21 - -== data 0x80001000 +== data 0x80500000 Message: - # "Hello World\n\0" + # "Hello World!\n\0" 48/8 65/8 6c/8 6c/8 6f/8 20/8 77/8 6f/8 72/8 6c/8 64/8 21/8 0a/8 00/8 |