From f0ad502e4651243d6a96194b3393bd460c0f7fc9 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Karel=20Ko=C4=8D=C3=AD?= Date: Sun, 19 Nov 2017 21:23:04 +0100 Subject: Another huge pile of work for about two months Well I should commit every change instead of this madness. I am not documenting changes as all this is just improvements and implementation progression. --- qtmips_machine/alu.h | 38 +++++++++++++++++++++++++++++++++----- 1 file changed, 33 insertions(+), 5 deletions(-) (limited to 'qtmips_machine/alu.h') diff --git a/qtmips_machine/alu.h b/qtmips_machine/alu.h index e913b0c..974b462 100644 --- a/qtmips_machine/alu.h +++ b/qtmips_machine/alu.h @@ -1,11 +1,39 @@ #ifndef ALU_H #define ALU_H +#include +#include -class Alu -{ -public: - Alu(); +// TODO Any other operations? We seems to be missing a lot of them. +enum AluOp : std::uint8_t { + ALU_OP_SLL = 0, + ALU_OP_SRL = 2, + ALU_OP_SRA, + ALU_OP_SLLV, + ALU_OP_SRLV = 6, + ALU_OP_SRAV, + ALU_OP_ADD = 32, + ALU_OP_ADDU, + ALU_OP_SUB, + ALU_OP_SUBU, + ALU_OP_AND, + ALU_OP_OR, + ALU_OP_XOR, + ALU_OP_NOR, + ALU_OP_SLT = 42, + ALU_OP_SLTU, + ALU_OP_LAST = 64 // First impossible operation (just to be sure that we don't overflow) }; -#endif // ALU_H \ No newline at end of file +// Do ALU operation. +// operation: This is function field from instruction or shifted opcode for immediate instructions +// s: Loaded from rs. Also calles as source. +// t: Loaded from rt or immediate field from instruction it self. Also called as target. +// sa: This is value directly from instruction it self (sa section) used for shift operations +// Returned value is commonly saved to rt/rd or any other way passed trough core +std::uint32_t alu_operate(enum AluOp operation, std::uint32_t s, std::uint32_t t, std::uint8_t sa); + +// Returns string representation of ALU instruction (internally used by Instruction::to_str) +QString alu_str(enum AluOp operation, std::uint32_t s, std::uint32_t t, std::uint8_t sa); + +#endif // ALU_H -- cgit v1.2.3