2021-12-25 14:35:36 +00:00
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// sumtest.S
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// David_Harris@hmc.edu 24 December 2021
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.global rvtest_entry_point
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rvtest_entry_point:
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la sp, topofstack # Initialize stack pointer
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la t0, N # get address of N in data
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ld a0, 0(t0) # load N
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2021-12-29 00:28:51 +00:00
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csrr s8, instret # count instructions before call
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2021-12-25 14:35:36 +00:00
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jal sum # call sum(N)
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2021-12-29 00:28:51 +00:00
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csrr s9, instret # count instructions after call
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sub s9, s9, s8 # length of call
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2021-12-25 14:35:36 +00:00
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la t0, begin_signature # address of signature
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sd a0, 0(t0) # store sum(N) in signature
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2021-12-29 00:28:51 +00:00
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sd s9, 8(t0) # record performance
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2021-12-25 14:35:36 +00:00
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write_tohost:
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la t1, tohost
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li t0, 1 # 1 for success, 3 for failure
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sd t0, 0(t1) # send success code
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self_loop:
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j self_loop # wait
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.section .tohost
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tohost: # write to HTIF
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.dword 0
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fromhost:
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.dword 0
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.data
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N:
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.dword 4
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2021-12-29 00:28:51 +00:00
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.EQU XLEN,64
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2021-12-25 14:35:36 +00:00
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begin_signature:
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2021-12-29 00:28:51 +00:00
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.fill 2*(XLEN/32),4,0xdeadbeef #
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2021-12-25 14:35:36 +00:00
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end_signature:
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# Initialize stack with room for 512 bytes
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.bss
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.space 512
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topofstack:
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