.section .text
.globl _entry
_entry:
    # Both call and j will work here, but since ra will be cleared,
    # we will need a jump instruction back (from _clear) to continue.
    call _clear

continue:
    # Set up a stack for C.
    la sp, stack0
    li a0, 1024*4       # a0 = 4096
    csrr a1, mhartid    # a1 = hart id
    addi a1, a1, 1      # hartid + 1
    mul a0, a0, a1      # a0 *= hartid+1
    add sp, sp, a0      # sp += a0

    # Jump to start() in start.c
    call start

1:
    j 1b                 # Infinite loop

.section .text
.globl _clear
_clear:
    li x1, 0x0 # ra: Return address
    li x2, 0x0 # sp: Stack points
    li x3, 0x0 # gp: Global pointer
    li x4, 0x0 # tp: Thread pointer
    li x5, 0x0
    li x6, 0x0
    li x7, 0x0
    li x8, 0x0
    li x9, 0x0
    li x10, 0x0
    li x11, 0x0
    li x12, 0x0
    li x13, 0x0
    li x14, 0x0
    li x15, 0x0
    li x16, 0x0
    li x17, 0x0
    li x18, 0x0
    li x19, 0x0
    li x20, 0x0
    li x21, 0x0
    li x22, 0x0
    li x23, 0x0
    li x24, 0x0
    li x25, 0x0
    li x26, 0x0
    li x27, 0x0
    li x28, 0x0
    li x29, 0x0
    li x30, 0x0
    li x31, 0x0

    # ret wont work here since we cleared x1
    j continue