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author | Gabe Black <gblack@eecs.umich.edu> | 2010-06-02 12:58:00 -0500 |
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committer | Gabe Black <gblack@eecs.umich.edu> | 2010-06-02 12:58:00 -0500 |
commit | 7b8525287d7474fc90aba9ee7174174b1b672ea4 (patch) | |
tree | 9315c6e09be9847aa43d553652eaf6ae31fe16cd /src/arch/arm/isa | |
parent | aaa619ea231f003d22cf681dbd90d641f476b84f (diff) | |
download | gem5-7b8525287d7474fc90aba9ee7174174b1b672ea4.tar.xz |
ARM: Stub out the 16 bit thumb decoder.
Diffstat (limited to 'src/arch/arm/isa')
-rw-r--r-- | src/arch/arm/isa/thumbdecode.isa | 129 |
1 files changed, 128 insertions, 1 deletions
diff --git a/src/arch/arm/isa/thumbdecode.isa b/src/arch/arm/isa/thumbdecode.isa index c6fd3b21f..6277e7b59 100644 --- a/src/arch/arm/isa/thumbdecode.isa +++ b/src/arch/arm/isa/thumbdecode.isa @@ -41,6 +41,133 @@ // Authors: Gabe Black 1: decode BIGTHUMB { - 0: Unknown::unknown(); + // 16 bit thumb instructions. + 0: decode TOPCODE_15_13 { + 0x0, 0x1: decode TOPCODE_13_11 { + 0x0: WarnUnimpl::lsl(); //immediate + 0x1: WarnUnimpl::lsr(); //immediate + 0x2: WarnUnimpl::asr(); //immediate + 0x3: decode TOPCODE_10_9 { + 0x0: WarnUnimpl::add(); //register + 0x1: WarnUnimpl::sub(); //register + 0x2: WarnUnimpl::add(); //3 bit immediate + 0x3: WarnUnimpl::sub(); //3 bit immediate + } + 0x4: WarnUnimpl::mov(); //immediate + 0x5: WarnUnimpl::cmp(); //immediate + 0x6: WarnUnimpl::add(); //8 bit immediate, thumb + 0x7: WarnUnimpl::sub(); //8 bit immediate, thumb + } + 0x2: decode TOPCODE_12_10 { + // Data processing + 0x0: decode TOPCODE_9_6 { + 0x0: WarnUnimpl::and(); //register + 0x1: WarnUnimpl::eor(); //register + 0x2: WarnUnimpl::lsl(); //register + 0x3: WarnUnimpl::lsr(); //register + 0x4: WarnUnimpl::asr(); //register + 0x5: WarnUnimpl::adc(); //register + 0x6: WarnUnimpl::sbc(); //register + 0x7: WarnUnimpl::ror(); //register + 0x8: WarnUnimpl::tst(); //register + 0x9: WarnUnimpl::rsb(); //immediate + 0xa: WarnUnimpl::cmp(); //register (high registers) + 0xb: WarnUnimpl::cmn(); //register + 0xc: WarnUnimpl::orr(); //register + 0xd: WarnUnimpl::mul(); + 0xe: WarnUnimpl::bic(); //register + 0xf: WarnUnimpl::mvn(); //register + } + // Special data instructions and branch and exchange + 0x1: decode TOPCODE_9_6 { + 0x0: WarnUnimpl::add(); //register (low registers) + 0x1, 0x2, 0x3: WarnUnimpl::add(); //register (high registers) + 0x4: WarnUnimpl::unpredictable(); //? + 0x5, 0x6, 0x7: WarnUnimpl::cmp(); //register + 0x8: WarnUnimpl::mov(); //register (low registers) + 0x9, 0xa, 0xb: WarnUnimpl::mov(); //register (high registers) + 0xc, 0xd: WarnUnimpl::bx(); + 0xe, 0xf: WarnUnimpl::blx(); //register + } + 0x2, 0x3: WarnUnimpl::ldr(); + default: decode TOPCODE_11_9 { + 0x0: WarnUnimpl::str(); //register + 0x1: WarnUnimpl::strh(); //register + 0x2: WarnUnimpl::strb(); //register + 0x3: WarnUnimpl::ldrsb(); //register + 0x4: WarnUnimpl::ldr(); //register + 0x5: WarnUnimpl::ldrh(); //register + 0x6: WarnUnimpl::ldrb(); //register + 0x7: WarnUnimpl::ldrsh(); //register + } + } + 0x3: decode TOPCODE_12_11 { + 0x0: WarnUnimpl::str(); //immediate, thumb + 0x1: WarnUnimpl::ldr(); //immediate, thumb + 0x2: WarnUnimpl::strb(); //immediate, thumb + 0x3: WarnUnimpl::ldrb(); //immediate, thumb + } + 0x4: decode TOPCODE_12_11 { + 0x0: WarnUnimpl::strh(); //immediate, thumb + 0x1: WarnUnimpl::ldrh(); //immediate, thumb + 0x2: WarnUnimpl::str(); //immediate, thumb + 0x3: WarnUnimpl::ldr(); //immediate, thumb + } + 0x5: decode TOPCODE_12_11 { + 0x0: WarnUnimpl::adr(); + 0x1: WarnUnimpl::add(); //sp, immediate + 0x2: decode TOPCODE_10_8 { + 0x0: decode TOPCODE_7 { + 0x0: WarnUnimpl::add(); //sp, immediate + 0x1: WarnUnimpl::sub(); //sp, immediate + } + 0x1, 0x3: WarnUnimpl::cbz(); //cbnz too... + 0x2: decode TOPCODE_7_6 { + 0x0: WarnUnimpl::sxth(); + 0x1: WarnUnimpl::sxtb(); + 0x2: WarnUnimpl::uxth(); + 0x3: WarnUnimpl::uxtb(); + } + 0x4, 0x5: WarnUnimpl::pop(); + 0x6: decode TOPCODE_7_5 { + 0x2: WarnUnimpl::setend(); + 0x3: WarnUnimpl::cps(); + } + } + 0x3: decode TOPCODE_10_8 { + 0x1, 0x3: WarnUnimpl::cbz(); //cbnz too... + 0x2: decode TOPCODE_7_6 { + 0x0: WarnUnimpl::rev(); + 0x1: WarnUnimpl::rev16(); + 0x3: WarnUnimpl::revsh(); + } + 0x4, 0x5: WarnUnimpl::pop(); + 0x6: WarnUnimpl::bkpt(); + 0x7: decode TOPCODE_3_0 { + 0x0: WarnUnimpl::it(); + default: decode TOPCODE_7_4 { + 0x0: WarnUnimpl::nop(); + 0x1: WarnUnimpl::yield(); + 0x2: WarnUnimpl::wfe(); + 0x3: WarnUnimpl::wfi(); + 0x4: WarnUnimpl::sev(); + default: WarnUnimpl::unallocated_hint(); + } + } + } + } + 0x6: decode TOPCODE_12_11 { + 0x0: WarnUnimpl::stm(); // also stmia, stmea + 0x1: WarnUnimpl::ldm(); // also ldmia, ldmea + default: decode TOPCODE_11_8 { + 0xe: WarnUnimpl::undefined(); // permanently undefined + 0xf: WarnUnimpl::svc(); // formerly swi + default: WarnUnimpl::b(); // conditional + } + } + 0x7: decode TOPCODE_12_11 { + 0x0: WarnUnimpl::b(); // unconditional + } + } 1: Unknown::unknown(); } |