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temp commit 

Signed-off-by: liangkangnan <liangkangnan@163.com>
pull/4/head
liangkangnan 2021-05-11 16:21:58 +08:00
parent 36147d9391
commit b02b38bddc
2 changed files with 28 additions and 6 deletions
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7
rtl/core/csr_reg.sv
View File

@ -225,7 +225,12 @@ module csr_reg(
dpc_we = 1'b1;
end
`CSR_DCSR: begin
// Not all bits in DCSR are writable by exu
if (exu_we_i) begin
dcsr_d = {dcsr_q[31:28], wdata[27:9], dcsr_q[8:6], wdata[5:4], dcsr_q[3], wdata[2:0]};
end else begin
dcsr_d = wdata;
end
dcsr_we = 1'b1;
end
default:;
@ -345,7 +350,7 @@ module csr_reg(
// dcsr
csr #(
.RESET_VAL(32'h0)
.RESET_VAL(32'h40000000)
) dcsr_csr (
.clk(clk),
.rst_n(rst_n),

23
rtl/core/exception.sv
View File

@ -31,6 +31,7 @@
`define DCSR_CAUSE_STEP 3'h4
`define DCSR_CAUSE_DBGREQ 3'h3
`define DCSR_CAUSE_EBREAK 3'h1
`define DCSR_CAUSE_HALT 3'h5
module exception (
@ -187,21 +188,26 @@ module exception (
reg enter_debug_cause_debugger_req;
reg enter_debug_cause_single_step;
reg enter_debug_cause_ebreak;
reg enter_debug_cause_reset_halt;
reg[2:0] dcsr_cause_d, dcsr_cause_q;
always @ (*) begin
enter_debug_cause_debugger_req = 1'b0;
enter_debug_cause_single_step = 1'b0;
enter_debug_cause_ebreak = 1'b0;
enter_debug_cause_reset_halt = 1'b0;
dcsr_cause_d = `DCSR_CAUSE_NONE;
if (inst_ebreak_i & debug_mode_q) begin
enter_debug_cause_ebreak = 1'b1;
dcsr_cause_d = `DCSR_CAUSE_EBREAK;
end else if ((inst_addr_i == `CPU_RESET_ADDR) & inst_valid_i & debug_req_i) begin
enter_debug_cause_reset_halt = 1'b1;
dcsr_cause_d = `DCSR_CAUSE_HALT;
end else if ((~debug_mode_q) & debug_req_i & inst_valid_i) begin
enter_debug_cause_debugger_req = 1'b1;
dcsr_cause_d = `DCSR_CAUSE_DBGREQ;
end else if (inst_ebreak_i & dcsr_i[15]) begin
end else if ((~debug_mode_q) & dcsr_i[2] & (state_q == S_IDLE)) begin
enter_debug_cause_single_step = 1'b1;
dcsr_cause_d = `DCSR_CAUSE_STEP;
end
@ -209,6 +215,7 @@ module exception (
wire debug_mode_req = enter_debug_cause_debugger_req |
enter_debug_cause_single_step |
enter_debug_cause_reset_halt |
enter_debug_cause_ebreak;
assign stall_flag_o = ((state_q != S_IDLE) & (state_q != S_ASSERT)) |
@ -237,13 +244,23 @@ module exception (
state_d = S_W_MEPC;
end else if (debug_mode_req) begin
debug_mode_d = 1'b1;
if (enter_debug_cause_debugger_req) begin
if (enter_debug_cause_debugger_req |
enter_debug_cause_single_step |
enter_debug_cause_reset_halt) begin
csr_we = 1'b1;
csr_waddr = {20'h0, `CSR_DPC};
csr_wdata = inst_addr_i;
csr_wdata = enter_debug_cause_reset_halt ? (`CPU_RESET_ADDR) : inst_addr_i;
// when run openocd compliance test, use it.
// openocd compliance test bug: It report test fail when the reset address is 0x0:
// "NDMRESET should move DPC to reset value."
//csr_wdata = enter_debug_cause_reset_halt ? (`CPU_RESET_ADDR + 4'h4) : inst_addr_i;
end
assert_addr_d = debug_halt_addr_i;
if (enter_debug_cause_ebreak) begin
state_d = S_ASSERT;
end else begin
state_d = S_W_DCSR;
end
end else if (inst_mret_i) begin
assert_addr_d = mepc_i;
state_d = S_ASSERT;