diff options
Diffstat (limited to 'src/arch/arm/isa/formats')
-rw-r--r-- | src/arch/arm/isa/formats/misc.isa | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/arch/arm/isa/formats/misc.isa b/src/arch/arm/isa/formats/misc.isa index a7172f7cb..36bccbba4 100644 --- a/src/arch/arm/isa/formats/misc.isa +++ b/src/arch/arm/isa/formats/misc.isa @@ -40,3 +40,40 @@ def format Svc() {{ decode_block = "return new Svc(machInst);" }}; + +def format ArmMsrMrs() {{ + decode_block = ''' + { + const uint8_t byteMask = bits(machInst, 19, 16); + const IntRegIndex rn = (IntRegIndex)(uint32_t)bits(machInst, 3, 0); + const IntRegIndex rd = (IntRegIndex)(uint32_t)bits(machInst, 15, 12); + const uint32_t opcode = bits(machInst, 24, 21); + const bool useImm = bits(machInst, 25); + + const uint32_t unrotated = bits(machInst, 7, 0); + const uint32_t rotation = (bits(machInst, 11, 8) << 1); + const uint32_t imm = rotate_imm(unrotated, rotation); + + switch (opcode) { + case 0x8: + return new MrsCpsr(machInst, rd); + case 0x9: + if (useImm) { + return new MsrCpsrImm(machInst, imm, byteMask); + } else { + return new MsrCpsrReg(machInst, rn, byteMask); + } + case 0xa: + return new MrsSpsr(machInst, rd); + case 0xb: + if (useImm) { + return new MsrSpsrImm(machInst, imm, byteMask); + } else { + return new MsrSpsrReg(machInst, rn, byteMask); + } + default: + return new Unknown(machInst); + } + } + ''' +}}; |