X-Git-Url: http://git.joshuawise.com/firearm.git/blobdiff_plain/793482e95432866affeec1c87c4d9e94caed8934..b770ec9a582cb5401f2b969bda91d65a4adf5f67:/Execute.v diff --git a/Execute.v b/Execute.v index 3a21968..66a63e5 100644 --- a/Execute.v +++ b/Execute.v @@ -9,6 +9,7 @@ module Execute( input [31:0] pc, input [31:0] insn, input [31:0] cpsr, + input [31:0] spsr, input [31:0] op0, input [31:0] op1, input [31:0] op2, @@ -17,9 +18,15 @@ module Execute( output reg outstall = 0, output reg outbubble = 1, output reg [31:0] outcpsr = 0, + output reg [31:0] outspsr = 0, output reg write_reg = 1'bx, output reg [3:0] write_num = 4'bxxxx, - output reg [31:0] write_data = 32'hxxxxxxxx + output reg [31:0] write_data = 32'hxxxxxxxx, + output reg [31:0] jmppc, + output reg jmp, + output reg [31:0] outpc, + output reg [31:0] outinsn, + output reg [31:0] outop0, outop1, outop2 ); reg mult_start; @@ -34,11 +41,12 @@ module Execute( wire alu_setres; reg next_outbubble; - reg [31:0] next_outcpsr; + reg [31:0] next_outcpsr, next_outspsr; reg next_write_reg; reg [3:0] next_write_num; + reg [31:0] next_write_data; - + Multiplier multiplier( .clk(clk), .Nrst(Nrst), .start(mult_start), .acc0(mult_acc0), .in0(mult_in0), @@ -49,18 +57,31 @@ module Execute( .in0(alu_in0), .in1(alu_in1), .cpsr(cpsr), .op(alu_op), .setflags(alu_setflags), .shifter_carry(carry), .result(alu_result), .cpsr_out(alu_outcpsr), .setres(alu_setres)); - + always @(posedge clk) begin if (!stall) begin outbubble <= next_outbubble; outcpsr <= next_outcpsr; + outspsr <= next_outspsr; write_reg <= next_write_reg; write_num <= next_write_num; write_data <= next_write_data; + outpc <= pc; + outinsn <= insn; + outop0 <= op0; + outop1 <= op1; + outop2 <= op2; end end + + reg delayedflush = 0; + always @(posedge clk) + if (flush && outstall /* halp! I can't do it now, maybe later? */) + delayedflush <= 1; + else if (!outstall /* anything has been handled this time around */) + delayedflush <= 0; reg prevstall = 0; always @(posedge clk) @@ -69,22 +90,26 @@ module Execute( always @(*) begin outstall = stall; - next_outbubble = inbubble; + next_outbubble = inbubble | flush | delayedflush; next_outcpsr = cpsr; + next_outspsr = spsr; next_write_reg = 0; next_write_num = 4'hx; next_write_data = 32'hxxxxxxxx; - + mult_start = 0; mult_acc0 = 32'hxxxxxxxx; mult_in0 = 32'hxxxxxxxx; mult_in1 = 32'hxxxxxxxx; - + alu_in0 = 32'hxxxxxxxx; alu_in1 = 32'hxxxxxxxx; alu_op = 4'hx; /* hax! */ alu_setflags = 1'bx; - + + jmp = 1'b0; + jmppc = 32'h00000000; + casez (insn) `DECODE_ALU_MULT: /* Multiply -- must come before ALU, because it pattern matches a specific case of ALU */ begin @@ -104,9 +129,29 @@ module Execute( next_write_data = mult_result; end // `DECODE_ALU_MUL_LONG, /* Multiply long */ - `DECODE_ALU_MRS, /* MRS (Transfer PSR to register) */ + `DECODE_ALU_MRS: /* MRS (Transfer PSR to register) */ + begin + next_write_reg = 1; + next_write_num = insn[15:12]; + if (insn[22] /* Ps */) + next_write_data = spsr; + else + next_write_data = cpsr; + end `DECODE_ALU_MSR, /* MSR (Transfer register to PSR) */ - `DECODE_ALU_MSR_FLAGS, /* MSR (Transfer register or immediate to PSR, flag bits only) */ + `DECODE_ALU_MSR_FLAGS: /* MSR (Transfer register or immediate to PSR, flag bits only) */ + if ((cpsr[4:0] == `MODE_USR) || (insn[16] /* that random bit */ == 1'b0)) /* flags only */ + begin + if (insn[22] /* Ps */) + next_outspsr = {op0[31:29], spsr[28:0]}; + else + next_outcpsr = {op0[31:29], cpsr[28:0]}; + end else begin + if (insn[22] /* Ps */) + next_outspsr = op0; + else + next_outcpsr = op0; + end `DECODE_ALU_SWP, /* Atomic swap */ `DECODE_ALU_BX, /* Branch */ `DECODE_ALU_HDATA_REG, /* Halfword transfer - register offset */ @@ -117,7 +162,7 @@ module Execute( alu_in0 = op0; alu_in1 = op1; alu_op = insn[24:21]; - alu_setflags = insn[20] /* I */; + alu_setflags = insn[20] /* S */; if (alu_setres) begin next_write_reg = 1; @@ -125,12 +170,24 @@ module Execute( next_write_data = alu_result; end - next_outcpsr = alu_outcpsr; + next_outcpsr = ((insn[15:12] == 4'b1111) && insn[20]) ? spsr : alu_outcpsr; end `DECODE_LDRSTR_UNDEFINED, /* Undefined. I hate ARM */ `DECODE_LDRSTR, /* Single data transfer */ - `DECODE_LDMSTM, /* Block data transfer */ - `DECODE_BRANCH, /* Branch */ + `DECODE_LDMSTM: /* Block data transfer */ + begin end + `DECODE_BRANCH: + begin + if(!inbubble && !flush && !delayedflush) begin + jmppc = pc + op0 + 32'h8; + if(insn[24]) begin + next_write_reg = 1; + next_write_num = 4'hE; /* link register */ + next_write_data = pc + 32'h4; + end + jmp = 1'b1; + end + end /* Branch */ `DECODE_LDCSTC, /* Coprocessor data transfer */ `DECODE_CDP, /* Coprocessor data op */ `DECODE_MRCMCR, /* Coprocessor register transfer */ @@ -194,8 +251,8 @@ module ALU( output reg [31:0] cpsr_out, output reg setres ); - wire [31:0] res; - wire flag_n, flag_z, flag_c, flag_v, setres; + reg [31:0] res; + reg flag_n, flag_z, flag_c, flag_v; wire [32:0] sum, diff, rdiff; wire sum_v, diff_v, rdiff_v;