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core: Implement the setb instruction

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Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Paul Mackerras
2020-08-03 14:31:58 +10:00
parent fa77a6f683
commit cce34039c3
2 changed files with 10 additions and 1 deletions
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2
decode1.vhdl
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@@ -289,7 +289,7 @@ architecture behaviour of decode1 is
2#0101111010# => (ALU, OP_POPCNT, NONE, NONE, RS, RA, '0', '0', '0', '0', ZERO, '0', is4B, '0', '0', '0', '0', '0', '0', NONE, '0', '0'), -- popcntw
2#0010111010# => (ALU, OP_PRTY, NONE, NONE, RS, RA, '0', '0', '0', '0', ZERO, '0', is8B, '0', '0', '0', '0', '0', '0', NONE, '0', '0'), -- prtyd
2#0010011010# => (ALU, OP_PRTY, NONE, NONE, RS, RA, '0', '0', '0', '0', ZERO, '0', is4B, '0', '0', '0', '0', '0', '0', NONE, '0', '0'), -- prtyw
-- 2#0010000000# setb
2#0010000000# => (ALU, OP_SETB, NONE, NONE, NONE, RT, '1', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0'), -- setb
2#0111110010# => (LDST, OP_TLBIE, NONE, NONE, NONE, NONE, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0'), -- slbia
2#0000011011# => (ALU, OP_SHL, NONE, RB, RS, RA, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0'), -- sld
2#0000011000# => (ALU, OP_SHL, NONE, RB, RS, RA, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '0', RC, '0', '0'), -- slw

9
execute1.vhdl
View File

@@ -875,6 +875,15 @@ begin
set_carry(v.e, rotator_carry, rotator_carry);
end if;
result_en := '1';
when OP_SETB =>
bfa := insn_bfa(e_in.insn);
crbit := to_integer(unsigned(bfa)) * 4;
result := (others => '0');
if cr_in(31 - crbit) = '1' then
result := (others => '1');
elsif cr_in(30 - crbit) = '1' then
result(0) := '1';
end if;
when OP_ISYNC =>
v.f.redirect := '1';