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WALLY-init-lib improvements to support functional coverage

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This commit is contained in:
David Harris 2024-10-13 20:59:41 -07:00
parent 9ef211b40d
commit 669ee6ca12
1 changed files with 14 additions and 0 deletions
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14
tests/coverage/WALLY-init-lib.h
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@ -127,6 +127,17 @@ write_tohost:
self_loop:
j self_loop # wait
// utility routines
# put a 1 in msb of a0 (position XLEN-1); works for both RV32 and RV64
setmsb:
li a0, 0x80000000 # 1 in bit 31
slli a1, a0, 1 # check if register is wider than 31 bits
beqz a1, 1f # yes, a0 has 1 in bit 31
slli a0, a0, 16 # no: shift a0 to have 1 inn bit 63
slli a0, a0, 16 # use two shifts of 16 bits each to be compatible with compiling either RV32 or 64
ret # return to calller
.section .tohost
tohost: # write to HTIF
@ -139,6 +150,9 @@ begin_signature:
.fill 6*(XLEN/32),4,0xdeadbeef #
end_signature:
scratch:
.fill 4,4,0x0
# Initialize stack with room for 512 bytes
.bss
.space 512