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arm fix negative branch offset

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This commit is contained in:
Matthew Berry 2020-10-09 20:17:51 -07:00
parent cf156829e5
commit 71235e4b2a
1 changed files with 1 additions and 2 deletions
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src/crab/arm/branch.cr
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@ -2,8 +2,7 @@ module ARM
def arm_branch(instr : Word) : Nil def arm_branch(instr : Word) : Nil
link = bit?(instr, 24) link = bit?(instr, 24)
offset = instr & 0xFFFFFF offset = instr & 0xFFFFFF
offset = (~offset &+ 1).to_i32 if bit?(offset, 23) # negative offset = (offset << 8).to_i32! >> 6
offset <<= 2
@r[14] = @r[15] - 4 if link @r[14] = @r[15] - 4 if link
@r[15] &+= offset @r[15] &+= offset
clear_pipeline clear_pipeline