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Fixed handling of compressed ISA

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This commit is contained in:
Eyck Jentzsch
2017-10-25 22:05:31 +02:00
parent 9970303fa4
commit b0dcb3b60e
7 changed files with 219 additions and 218 deletions
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104
riscv/gen_input/RV32C.core_desc
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@ -12,42 +12,37 @@ InsructionSet RV32CI {
PC[XLEN](is_pc)
}
instructions{
C.ADDI4SPN { //(RES, nzuimm=0)
encoding: b000 | nzuimm[5:4] | nzuimm[9:6] | nzuimm[2:2] | nzuimm[3:3] | rd[2:0] | b00;
args_disass: "x%rd$d, 0x%nzuimm$05x";
if(nzuimm == 0)
raise(0, 2);
C.ADDI4SPN { //(RES, imm=0)
encoding: b000 | imm[5:4] | imm[9:6] | imm[2:2] | imm[3:3] | rd[2:0] | b00;
args_disass: "x%rd$d, 0x%imm$05x";
if(imm == 0) raise(0, 2);
val rd_idx[5] <= rd+8;
val x2_idx[5] <= 2;
X[rd_idx] <= X[x2_idx] + nzuimm;
X[rd_idx] <= X[x2_idx] + imm;
}
C.LW { // (RV32)
encoding: b010 | uimm[5:3] | rs1[2:0] | uimm[2:2] | uimm[6:6] | rd[2:0] | b00;
args_disass: "x(8+%rd$d), x(8+%rs1$d), 0x%uimm$05x";
val rs1_idx[5] <= rs1+8;
val adr[XLEN] <= X[rs1_idx]+uimm;
val rd_idx[5] <= rd+8;
X[rd_idx] <= MEM[adr]{32};
val offs[XLEN] <= X[rs1_idx]+uimm;
X[rd_idx] <= MEM[offs]{32};
}
C.SW {//(RV32)
encoding: b110 | uimm[5:3] | rs1[2:0] | uimm[2:2] | uimm[6:6] | rs2[2:0] | b00;
args_disass: "x(8+%rs1$d), x(8+%rs2$d), 0x%uimm$05x";
val rs1_idx[5] <= rs1+8;
val adr[XLEN] <= X[rs1_idx]+uimm;
val rs2_idx[5] <= rs2+8;
MEM[adr]{32} <= X[rs2_idx];
}
C.NOP {//(RV32)
encoding: b000 | b0 | b00000 | b00000 | b01; //TODO
args_disass: "";
val offs[XLEN] <= X[rs1_idx]+uimm;
MEM[offs]{32} <= X[rs2_idx];
}
C.ADDI {//(RV32)
encoding:b000 | nzimm[5:5]s | rs1[4:0] | nzimm[4:0]s | b01;
args_disass: "x%rs1$d, 0x%nzimm$05x";
if(nzimm == 0)
raise(0, 2);
X[rs1] <= X[rs1] + nzimm;
encoding:b000 | imm[5:5]s | rs1[4:0] | imm[4:0]s | b01;
args_disass: "x%rs1$d, 0x%imm$05x";
X[rs1] <= X[rs1] + imm;
}
C.NOP {
encoding:b000 | b0 | b00000 | b00000 | b01;
}
// C.JAL will be overwritten by C.ADDIW for RV64/128
C.JAL(no_cont) {//(RV32)
@ -60,35 +55,32 @@ InsructionSet RV32CI {
C.LI {//(RV32)
encoding:b010 | imm[5:5]s | rd[4:0] | imm[4:0]s | b01;
args_disass: "x%rd$d, 0x%imm$05x";
if(rd == 0) raise(0, 2);
if(rd == 0) raise(0, 2); //TODO: should it be handled as trap?
X[rd] <= imm;
}
// order matters here as C.ADDI16SP overwrites C.LUI vor rd==2
C.LUI {//(RV32)
encoding:b011 | nzimm[17:17]s | rd[4:0] | nzimm[16:12]s | b01;
args_disass: "x%rd$d, 0x%nzimm$05x";
if(rd == 0) raise(0, 2);
if(rd == 2) raise(0, 2);
if(nzimm == 0) raise(0, 2);
X[rd] <= nzimm;
encoding:b011 | imm[17:17]s | rd[4:0] | imm[16:12]s | b01;
args_disass: "x%rd$d, 0x%imm$05x";
if(rd == 0) raise(0, 2); //TODO: should it be handled as trap?
if(imm == 0) raise(0, 2); //TODO: should it be handled as trap?
X[rd] <= imm;
}
C.ADDI16SP {//(RV32)
encoding:b011 | nzimm[9:9]s | b00010 | nzimm[4:4]s |nzimm[6:6]s | nzimm[8:7]s | nzimm[5:5]s | b01;
args_disass: "0x%nzimm$05x";
encoding:b011 | imm[9:9]s | b00010 | imm[4:4]s | imm[6:6]s | imm[8:7]s | imm[5:5]s | b01;
args_disass: "0x%imm$05x";
val x2_idx[5] <= 2;
X[x2_idx] <= X[x2_idx]s + nzimm;
X[x2_idx] <= X[x2_idx]s + imm;
}
C.SRLI {//(RV32 nse)
encoding:b100 | shamt[5:5] | b00 | rs1[2:0] | shamt[4:0] | b01;
encoding:b100 | b0 | b00 | rs1[2:0] | shamt[4:0] | b01;
args_disass: "x(8+%rs1$d), %shamt$d";
if(shamt > 31) raise(0, 2);
val rs1_idx[5] <= rs1+8;
X[rs1_idx] <= shrl(X[rs1_idx], shamt);
}
C.SRAI {//(RV32)
encoding:b100 | shamt[5:5] | b01 | rs1[2:0] | shamt[4:0] | b01;
encoding:b100 | b0 | b01 | rs1[2:0] | shamt[4:0] | b01;
args_disass: "x(8+%rs1$d), %shamt$d";
if(shamt > 31) raise(0, 2);
val rs1_idx[5] <= rs1+8;
X[rs1_idx] <= shra(X[rs1_idx], shamt);
}
@ -132,27 +124,23 @@ InsructionSet RV32CI {
PC<=PC+imm;
}
C.BEQZ(no_cont) {//(RV32)
encoding:b110 | imm[8:8]s | imm[4:3]s | rs1d[2:0] | imm[7:6]s |imm[2:1]s | imm[5:5]s | b01;
args_disass: "x(8+%rs1d$d), 0x%imm$05x";
val rs1[5] <= rs1d+8;
PC<=choose(X[rs1]==0, PC+imm, PC+2);
encoding:b110 | imm[8:8]s | imm[4:3]s | rs1[2:0] | imm[7:6]s |imm[2:1]s | imm[5:5]s | b01;
args_disass: "x(8+%rs1$d), 0x%imm$05x";
val rs1_idx[5] <= rs1+8;
PC<=choose(X[rs1_idx]==0, PC+imm, PC+2);
}
C.BNEZ(no_cont) {//(RV32)
encoding:b111 | imm[8:8] | imm[4:3] | rs1d[2:0] | imm[7:6] | imm[2:1] | imm[5:5] | b01;
args_disass: "x(8+%rs1d$d),, 0x%imm$05x";
val rs1[5] <= rs1d+8;
PC<=choose(X[rs1]!=0, PC+imm, PC+2);
encoding:b111 | imm[8:8]s | imm[4:3]s | rs1[2:0] | imm[7:6]s | imm[2:1]s | imm[5:5]s | b01;
args_disass: "x(8+%rs1$d), 0x%imm$05x";
val rs1_idx[5] <= rs1+8;
PC<=choose(X[rs1_idx]!=0, PC+imm, PC+2);
}
C.SLLI {//(RV32)
encoding:b000 | shamt[5:5] | rs1[4:0] | shamt[4:0] | b10;
encoding:b000 | b0 | rs1[4:0] | shamt[4:0] | b10;
args_disass: "x%rs1$d, %shamt$d";
if(rs1 == 0) raise(0, 2);
if(shamt > 31) raise(0, 2);
X[rs1] <= shll(X[rs1], shamt);
}
C.LQSP {//(RV128)
encoding:b001 | uimm[5:5] | rd[4:0] | uimm[4:4] | uimm[9:6] | b10;
}
C.LWSP {//
encoding:b010 | uimm[5:5] | rd[4:0] | uimm[4:2] | uimm[7:6] | b10;
args_disass: "x%rd$d, sp, 0x%uimm$05x";
@ -160,7 +148,7 @@ InsructionSet RV32CI {
val offs[XLEN] <= X[x2_idx] + uimm;
X[rd] <= MEM[offs]{32};
}
// order matters as C.JR is a special case of C.JR
// order matters as C.JR is a special case of C.MV
C.MV {//(RV32)
encoding:b100 | b0 | rd[4:0] | rs2[4:0] | b10;
args_disass: "x%rd$d, x%rs2$d";
@ -171,23 +159,23 @@ InsructionSet RV32CI {
args_disass: "x%rs1$d";
PC <= X[rs1];
}
C.EBREAK(no_cont) {//(RV32)
encoding:b100 | b1 | b00000 | b00000 | b10;
raise(0, 3);
}
// order matters as C.JALR is a special case of C.ADD
// order matters as C.EBREAK is a special case of C.JALR which is a special case of C.ADD
C.ADD {//(RV32)
encoding:b100 | b1 | rd[4:0] | rs2[4:0] | b10;
args_disass: "x%rd$d, x%rs2$d";
X[rd] <= X[rd] + X[rs2];
X[rd] <= X[rd] + X[rs2];
}
C.JALR(no_cont) {//(RV32)
encoding:b100 | b1 | rs1[4:0] | b00000 | b10;
args_disass: "x%rs1$d";
val rd[5] <= 1;
X[rd] <= PC+2;
val r_idx[5] <= 1;
X[r_idx] <= PC+2;
PC<=X[rs1];
}
C.EBREAK(no_cont) {//(RV32)
encoding:b100 | b1 | b00000 | b00000 | b10;
raise(0, 3);
}
C.SWSP {//
encoding:b110 | uimm[5:2] | uimm[7:6] | rs2[4:0] | b10;
args_disass: "x2+0x%uimm$05x, x%rs2$d";
@ -195,6 +183,10 @@ InsructionSet RV32CI {
val offs[XLEN] <= X[x2_idx] + uimm;
MEM[offs]{32} <= X[rs2];
}
DII {
encoding:b000 | b0 | b00000 | b00000 | b00;
raise(0, 2);
}
}
}