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.section .text
.global irq
.global sieve
.global stats
#define TEST(n) \
.global n; .global n ## _ret; \
addi x1, zero, 1000; \
custom0 0,1,0,5; /* timer x1 */ \
jal zero,n; n ## _ret:
reset_vec:
custom0 0,0,7,3 // maskirq 7
j start
nop
nop
irq_vec:
/* save registers */
custom0 2,1,0,1 // setq q2, x1
custom0 3,2,0,1 // setq q3, x2
lui x1, %hi(irq_regs)
addi x1, x1, %lo(irq_regs)
custom0 2,0,0,0 // getq x2, q0
sw x2, 0*4(x1)
custom0 2,2,0,0 // getq x2, q2
sw x2, 1*4(x1)
custom0 2,3,0,0 // getq x2, q3
sw x2, 2*4(x1)
sw x3, 3*4(x1)
sw x4, 4*4(x1)
sw x5, 5*4(x1)
sw x6, 6*4(x1)
sw x7, 7*4(x1)
sw x8, 8*4(x1)
sw x9, 9*4(x1)
sw x10, 10*4(x1)
sw x11, 11*4(x1)
sw x12, 12*4(x1)
sw x13, 13*4(x1)
sw x14, 14*4(x1)
sw x15, 15*4(x1)
sw x16, 16*4(x1)
sw x17, 17*4(x1)
sw x18, 18*4(x1)
sw x19, 19*4(x1)
sw x20, 20*4(x1)
sw x21, 21*4(x1)
sw x22, 22*4(x1)
sw x23, 23*4(x1)
sw x24, 24*4(x1)
sw x25, 25*4(x1)
sw x26, 26*4(x1)
sw x27, 27*4(x1)
sw x28, 28*4(x1)
sw x29, 29*4(x1)
sw x30, 30*4(x1)
sw x31, 31*4(x1)
/* call interrupt handler */
lui sp, %hi(irq_stack_top)
addi sp, sp, %lo(irq_stack_top)
// arg0 = address of regs
lui a0, %hi(irq_regs)
addi a0, a0, %lo(irq_regs)
// arg1 = interrupt type
custom0 11,1,0,0 // getq x11, q1
// call to c function
jal ra, irq
/* restore registers */
lui x1, %hi(irq_regs)
addi x1, x1, %lo(irq_regs)
lw x2, 0*4(x1)
custom0 0,2,0,1 // setq q0, x2
lw x2, 1*4(x1)
custom0 1,2,0,1 // setq q1, x2
lw x2, 2*4(x1)
custom0 2,2,0,1 // setq q2, x2
lw x3, 3*4(x1)
lw x4, 4*4(x1)
lw x5, 5*4(x1)
lw x6, 6*4(x1)
lw x7, 7*4(x1)
lw x8, 8*4(x1)
lw x9, 9*4(x1)
lw x10, 10*4(x1)
lw x11, 11*4(x1)
lw x12, 12*4(x1)
lw x13, 13*4(x1)
lw x14, 14*4(x1)
lw x15, 15*4(x1)
lw x16, 16*4(x1)
lw x17, 17*4(x1)
lw x18, 18*4(x1)
lw x19, 19*4(x1)
lw x20, 20*4(x1)
lw x21, 21*4(x1)
lw x22, 22*4(x1)
lw x23, 23*4(x1)
lw x24, 24*4(x1)
lw x25, 25*4(x1)
lw x26, 26*4(x1)
lw x27, 27*4(x1)
lw x28, 28*4(x1)
lw x29, 29*4(x1)
lw x30, 30*4(x1)
lw x31, 31*4(x1)
custom0 1,1,0,0 // getq x1, q1
custom0 2,2,0,0 // getq x2, q2
custom0 0,0,0,2 // retirq
irq_regs:
// registers are saved to this memory region
// the program counter is saved as register 0
.fill 32,4
irq_stack:
.fill 128,4
irq_stack_top:
start:
addi x1, zero, 0
addi x2, zero, 0
addi x3, zero, 0
addi x4, zero, 0
addi x5, zero, 0
addi x6, zero, 0
addi x7, zero, 0
addi x8, zero, 0
addi x9, zero, 0
addi x10, zero, 0
addi x11, zero, 0
addi x12, zero, 0
addi x13, zero, 0
addi x14, zero, 0
addi x15, zero, 0
addi x16, zero, 0
addi x17, zero, 0
addi x18, zero, 0
addi x19, zero, 0
addi x20, zero, 0
addi x21, zero, 0
addi x22, zero, 0
addi x23, zero, 0
addi x24, zero, 0
addi x25, zero, 0
addi x26, zero, 0
addi x27, zero, 0
addi x28, zero, 0
addi x29, zero, 0
addi x30, zero, 0
addi x31, zero, 0
TEST(lui)
TEST(auipc)
TEST(j)
TEST(jal)
TEST(jalr)
TEST(beq)
TEST(bne)
TEST(blt)
TEST(bge)
TEST(bltu)
TEST(bgeu)
TEST(lb)
TEST(lh)
TEST(lw)
TEST(lbu)
TEST(lhu)
TEST(sb)
TEST(sh)
TEST(sw)
TEST(addi)
TEST(slti) // also tests sltiu
TEST(xori)
TEST(ori)
TEST(andi)
TEST(slli)
TEST(srli)
TEST(srai)
TEST(add)
TEST(sub)
TEST(sll)
TEST(slt) // what is with sltu ?
TEST(xor)
TEST(srl)
TEST(sra)
TEST(or)
TEST(and)
TEST(simple)
/* set stack pointer */
lui sp,(64*1024)>>12
/* jump to sieve C code */
jal ra,sieve
/* jump to stats C code */
jal ra,stats
/* print "DONE\n" */
lui a0,0x10000000>>12
addi a1,zero,'D'
addi a2,zero,'O'
addi a3,zero,'N'
addi a4,zero,'E'
addi a5,zero,'\n'
sw a1,0(a0)
sw a2,0(a0)
sw a3,0(a0)
sw a4,0(a0)
sw a5,0(a0)
/* break */
sbreak
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