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authorGabe Black <gblack@eecs.umich.edu>2010-06-02 12:58:00 -0500
committerGabe Black <gblack@eecs.umich.edu>2010-06-02 12:58:00 -0500
commit7b8525287d7474fc90aba9ee7174174b1b672ea4 (patch)
tree9315c6e09be9847aa43d553652eaf6ae31fe16cd /src/arch
parentaaa619ea231f003d22cf681dbd90d641f476b84f (diff)
downloadgem5-7b8525287d7474fc90aba9ee7174174b1b672ea4.tar.xz
ARM: Stub out the 16 bit thumb decoder.
Diffstat (limited to 'src/arch')
-rw-r--r--src/arch/arm/isa/thumbdecode.isa129
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();
}