diff options
Diffstat (limited to 'qtmips_gui/samples/cop0-test-ia.S')
| -rw-r--r-- | qtmips_gui/samples/cop0-test-ia.S | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/qtmips_gui/samples/cop0-test-ia.S b/qtmips_gui/samples/cop0-test-ia.S new file mode 100644 index 0000000..3bfe586 --- /dev/null +++ b/qtmips_gui/samples/cop0-test-ia.S @@ -0,0 +1,74 @@ +.set SERIAL_PORT_BASE, 0xffffc000 + +.set SERP_RX_ST_REG_o, 0x00 +.set SERP_RX_ST_REG_READY_m, 0x1 +.set SERP_RX_ST_REG_IE_m, 0x2 + +.set SERP_RX_DATA_REG_o, 0x04 + +.set SERP_TX_ST_REG_o, 0x08 +.set SERP_TX_ST_REG_READY_m, 0x1 +.set SERP_TX_ST_REG_IE_m, 0x2 + +.set SERP_TX_DATA_REG_o, 0x0c + + +.globl _start +.set noat +.set noreorder +.ent _start + +.text + +_start: + addi $1, $0, 0x101 + addi $2, $0, 0x102 + synci 0($zero) + addi $3, $0, 0x103 + addi $4, $0, 0x104 + la $20, skip + mtc0 $20, $14, 0 // EPC + eret + addi $5, $0, 0x105 + addi $6, $0, 0x106 +skip: + addi $7, $0, 0x107 + addi $8, $0, 0x108 + mfc0 $9, $14, 0 // EPC + + break + mfc0 $10, $14, 0 // EPC + + la $20, irq_entry - 0x180 + mtc0 $20, $15, 1 // EBase + + li $21, SERIAL_PORT_BASE + li $20, SERP_RX_ST_REG_IE_m + sw $20, SERP_RX_ST_REG_o($21) + li $20, 0x00000801 + mtc0 $20, $12, 0 // Status + +loop: mfc0 $10, $14, 0 // EPC + beq $zero, $zero, loop + nop + + +irq_entry: + mfc0 $26, $13, 0 // Cause + andi $27, $26, 0x00000800 + bne $27, $0, rx_irq + nop + mfc0 $27, $12, 0 // Status + nor $26, $26, $0 + andi $26, $26, 0x0000ff00 + and $27, $27, $26 + mtc0 $27, $12, 0 // Status + eret + +rx_irq: + li $26, SERIAL_PORT_BASE + lw $27, SERP_RX_DATA_REG_o($26) + sw $27, SERP_TX_DATA_REG_o($26) + eret + +.end _start |