From 98e05ee4b7aa8a08088b1f0cd6c581bb50f11395 Mon Sep 17 00:00:00 2001
From: merry <git@mary.rs>
Date: Thu, 17 Feb 2022 22:39:45 +0000
Subject: ARMeilleure: Thumb support (All T16 instructions) (#3105)
* Decoders: Add InITBlock argument
* OpCodeTable: Minor cleanup
* OpCodeTable: Remove existing thumb instruction implementations
* OpCodeTable: Prepare for thumb instructions
* OpCodeTables: Improve thumb fast lookup
* Tests: Prepare for thumb tests
* T16: Implement BX
* T16: Implement LSL/LSR/ASR (imm)
* T16: Implement ADDS, SUBS (reg)
* T16: Implement ADDS, SUBS (3-bit immediate)
* T16: Implement MOVS, CMP, ADDS, SUBS (8-bit immediate)
* T16: Implement ANDS, EORS, LSLS, LSRS, ASRS, ADCS, SBCS, RORS, TST, NEGS, CMP, CMN, ORRS, MULS, BICS, MVNS (low registers)
* T16: Implement ADD, CMP, MOV (high reg)
* T16: Implement BLX (reg)
* T16: Implement LDR (literal)
* T16: Implement {LDR,STR}{,H,B,SB,SH} (register)
* T16: Implement {LDR,STR}{,B,H} (immediate)
* T16: Implement LDR/STR (SP)
* T16: Implement ADR
* T16: Implement Add to SP (immediate)
* T16: Implement ADD/SUB (SP)
* T16: Implement SXTH, SXTB, UXTH, UTXB
* T16: Implement CBZ, CBNZ
* T16: Implement PUSH, POP
* T16: Implement REV, REV16, REVSH
* T16: Implement NOP
* T16: Implement LDM, STM
* T16: Implement SVC
* T16: Implement B (conditional)
* T16: Implement B (unconditional)
* T16: Implement IT
* fixup! T16: Implement ADD/SUB (SP)
* fixup! T16: Implement Add to SP (immediate)
* fixup! T16: Implement IT
* CpuTestThumb: Add randomized tests
* Remove inITBlock argument
* Address nits
* Use index to handle IfThenBlockState
* Reduce line noise
* fixup
* nit
---
ARMeilleure/Decoders/OpCodeT16MemStack.cs | 42 +++++++++++++++++++++++++++++++
1 file changed, 42 insertions(+)
create mode 100644 ARMeilleure/Decoders/OpCodeT16MemStack.cs
(limited to 'ARMeilleure/Decoders/OpCodeT16MemStack.cs')
diff --git a/ARMeilleure/Decoders/OpCodeT16MemStack.cs b/ARMeilleure/Decoders/OpCodeT16MemStack.cs
new file mode 100644
index 00000000..9d7b0d20
--- /dev/null
+++ b/ARMeilleure/Decoders/OpCodeT16MemStack.cs
@@ -0,0 +1,42 @@
+using ARMeilleure.Instructions;
+using ARMeilleure.State;
+using System;
+using System.Numerics;
+
+namespace ARMeilleure.Decoders
+{
+ class OpCodeT16MemStack : OpCodeT16, IOpCode32MemMult
+ {
+ public int Rn => RegisterAlias.Aarch32Sp;
+ public int RegisterMask { get; }
+ public int PostOffset { get; }
+ public bool IsLoad { get; }
+ public int Offset { get; }
+
+ public new static OpCode Create(InstDescriptor inst, ulong address, int opCode) => new OpCodeT16MemStack(inst, address, opCode);
+
+ public OpCodeT16MemStack(InstDescriptor inst, ulong address, int opCode) : base(inst, address, opCode)
+ {
+ int extra = (opCode >> 8) & 1;
+ int regCount = BitOperations.PopCount((uint)opCode & 0x1ff);
+
+ switch (inst.Name)
+ {
+ case InstName.Push:
+ RegisterMask = (opCode & 0xff) | (extra << 14);
+ IsLoad = false;
+ Offset = -4 * regCount;
+ PostOffset = -4 * regCount;
+ break;
+ case InstName.Pop:
+ RegisterMask = (opCode & 0xff) | (extra << 15);
+ IsLoad = true;
+ Offset = 0;
+ PostOffset = 4 * regCount;
+ break;
+ default:
+ throw new InvalidOperationException();
+ }
+ }
+ }
+}
--
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