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🐛 fix another C-ISA loophole (#806)

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stnolting 2024-02-15 15:53:05 +01:00 • committed by GitHub
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3
CHANGELOG.md
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@ -30,11 +30,12 @@ mimpid = 0x01040312 -> Version 01.04.03.12 -> v1.4.3.12
| Date | Version | Comment | Link |
|:----:|:-------:|:--------|:----:|
| 14.02.2024 | 1.9.4.12 | :bug: close another illegal compressed instruction encoding loophole | [#806](https://github.com/stnolting/neorv32/pull/806) |
| 11.02.2024 | 1.9.4.11 | :bug: fix several FPU bugs and design flaws | [#794](https://github.com/stnolting/neorv32/pull/794) |
| 11.02.2024 | 1.9.4.10 | minor additions to previous version (1.9.4.9): fix HPM configuration read-back | [#804](https://github.com/stnolting/neorv32/pull/804) |
| 10.02.2024 | 1.9.4.9 | fixing HPM configuration's null range assertions | [#803](https://github.com/stnolting/neorv32/pull/803) |
| 10.02.2024 | 1.9.4.8 | :bug: fix missing fence pass-through in caches | [#802](https://github.com/stnolting/neorv32/pull/802) |
| 09.02.2024 | 1.9.4.7 | :warning: integrate fence signal into CPU bus, remove top entity's fence signals | (#800)[https://github.com/stnolting/neorv32/pull/800] |
| 09.02.2024 | 1.9.4.7 | :warning: integrate fence signal into CPU bus, remove top entity's fence signals | [#800](https://github.com/stnolting/neorv32/pull/800) |
| 09.02.2024 | 1.9.4.6 | :sparkles: add configurable XIP cache | [#799](https://github.com/stnolting/neorv32/pull/799) |
| 09.02.2024 | 1.9.4.5 | :bug: close further illegal compressed instruction encoding loopholes | [#797](https://github.com/stnolting/neorv32/pull/797) |
| 04.02.2024 | 1.9.4.4 | :bug: fix minor bug: CPU instruction bus privilege signal did not remain stable during the entire request | [#792](https://github.com/stnolting/neorv32/pull/792) |

2
rtl/core/neorv32_cpu_decompressor.vhd
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@ -288,7 +288,7 @@ begin
decoded(instr_imm12_lsb_c + 2) <= ci_instr16_i(4);
decoded(instr_imm12_lsb_c + 3) <= ci_instr16_i(5);
decoded(instr_imm12_lsb_c + 4) <= ci_instr16_i(6);
if ((ci_instr16_i(12) or or_reduce_f(ci_instr16_i(6 downto 2))) = '0') then -- nzuimm = 0 -> RV32 custom / illegal
if (ci_instr16_i(12) = '1') then -- nzuimm[5] = 1 -> RV32 custom / illegal
illegal <= '1';
end if;
when "10" => -- C.ANDI

2
rtl/core/neorv32_package.vhd
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@ -53,7 +53,7 @@ package neorv32_package is
-- Architecture Constants -----------------------------------------------------------------
-- -------------------------------------------------------------------------------------------
constant hw_version_c : std_ulogic_vector(31 downto 0) := x"01090411"; -- hardware version
constant hw_version_c : std_ulogic_vector(31 downto 0) := x"01090412"; -- hardware version
constant archid_c : natural := 19; -- official RISC-V architecture ID
constant XLEN : natural := 32; -- native data path width