diff options
| author | iximeow <me@iximeow.net> | 2020-12-06 15:37:46 -0800 |
|---|---|---|
| committer | iximeow <me@iximeow.net> | 2020-12-06 15:37:46 -0800 |
| commit | 44542e4f40f13dbdc10ec491b50178bb39fc6ca1 (patch) | |
| tree | 246bf6080677847374b25ac2d3d90ef9404bdd36 /src/armv7/thumb.rs | |
| parent | 1572e928b41b5c0765d7f47b346110da14e58b9e (diff) | |
support CPS (change processor state) and some warming cleanup
Diffstat (limited to 'src/armv7/thumb.rs')
| -rw-r--r-- | src/armv7/thumb.rs | 54 |
1 files changed, 41 insertions, 13 deletions
diff --git a/src/armv7/thumb.rs b/src/armv7/thumb.rs index ab28be8..ecbf119 100644 --- a/src/armv7/thumb.rs +++ b/src/armv7/thumb.rs @@ -1591,14 +1591,42 @@ pub fn decode_into<T: IntoIterator<Item=u8>>(decoder: &InstDecoder, inst: &mut I if op1 != 0b000 { // `CPS (Thumb)` (`B9-1964`) // v6T2 - let _mode = lower & 0b11111; - let _aif = (lower >> 5) & 0b111; - let _m = (lower >> 8) & 1; - let _imod = (lower >> 9) & 0b11; - // TODO: no CPS instruction? yet? - eprintln!("cps support is not complete"); - return Err(DecodeError::Incomplete); - // inst.opcode = Opcode::CPS; + // encoding T2 + let mode = lower2[0..5].load::<u16>(); + let m = lower2[8]; + let aif = lower2[5..8].load::<u16>(); + let imod = lower2[9..11].load::<u8>(); + + if !m && imod == 0b00 { + // unreachable; would be a hint + } + if !m && mode != 0 { + decoder.unpredictable()?; + } + if imod < 0b10 { + if imod == 0b01 { + decoder.unpredictable()?; + } + inst.opcode = Opcode::CPS_modeonly; + inst.operands = [ + Operand::Imm12(mode), + Operand::Nothing, + Operand::Nothing, + Operand::Nothing, + ]; + } else { + inst.opcode = Opcode::CPS(imod == 0b11); + inst.operands = [ + Operand::Imm12(aif), + if m { + Operand::Imm12(mode) + } else { + Operand::Nothing + }, + Operand::Nothing, + Operand::Nothing, + ]; + } } else { if op2 >= 0b11110000 { // `DBG` (`A8-378`) @@ -2385,7 +2413,7 @@ pub fn decode_into<T: IntoIterator<Item=u8>>(decoder: &InstDecoder, inst: &mut I inst.opcode = opcode; inst.operands = [ Operand::Reg(Reg::from_u8(rt)), - Operand::RegDerefPreindexOffset(Reg::from_u8(rn), imm12, false, false), // no add, no wback + Operand::RegDerefPreindexOffset(Reg::from_u8(rn), imm12, u, false), // no add, no wback Operand::Nothing, Operand::Nothing, ]; @@ -2557,7 +2585,7 @@ pub fn decode_into<T: IntoIterator<Item=u8>>(decoder: &InstDecoder, inst: &mut I inst.opcode = opcode; inst.operands = [ Operand::Reg(Reg::from_u8(rt)), - Operand::RegDerefPreindexOffset(Reg::from_u8(rn), imm12, true, false), // add, no wback + Operand::RegDerefPreindexOffset(Reg::from_u8(rn), imm12, u, false), // add, no wback Operand::Nothing, Operand::Nothing, ]; @@ -2631,7 +2659,7 @@ pub fn decode_into<T: IntoIterator<Item=u8>>(decoder: &InstDecoder, inst: &mut I inst.opcode = opcode; inst.operands = [ Operand::Reg(Reg::from_u8(rt)), - Operand::RegDerefPreindexOffset(Reg::from_u8(15), imm12, false, false), // add, no wback + Operand::RegDerefPreindexOffset(Reg::from_u8(15), imm12, u, false), // add, no wback Operand::Nothing, Operand::Nothing, ]; @@ -2842,7 +2870,7 @@ pub fn decode_into<T: IntoIterator<Item=u8>>(decoder: &InstDecoder, inst: &mut I ][op1]; let rm = lower2[..4].load::<u8>(); - let rotate = lower2[1..3].load::<u8>() << 2;; + let rotate = lower2[1..3].load::<u8>() << 2; let rd = lower2[8..12].load::<u8>(); inst.opcode = op; @@ -2863,7 +2891,7 @@ pub fn decode_into<T: IntoIterator<Item=u8>>(decoder: &InstDecoder, inst: &mut I ][op1]; let rm = lower2[..4].load::<u8>(); - let rotate = lower2[1..3].load::<u8>() << 2;; + let rotate = lower2[1..3].load::<u8>() << 2; let rd = lower2[8..12].load::<u8>(); inst.opcode = op; |