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picorv32
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Added CATCH_MISALIGN and CATCH_ILLINSN

This commit is contained in:
Clifford Wolf 2015-07-01 21:20:51 +02:00
parent f6fe27ecbf
commit 34193bf9df
2 changed files with 23 additions and 8 deletions
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9
README.md
View File

@ -158,6 +158,15 @@ latches the value internally.
This parameter is only available for the `picorv32` core. In the
`picorv32_axi` core this is implicitly set to 0.
#### CATCH_MISALIGN (default = 1)
Set this to 0 to disable the circuitry for catching misaligned memory
accesses.
#### CATCH_ILLINSN (default = 1)
Set this to 0 to disable the circuitry for catching illegal instructions.
#### ENABLE_PCPI (default = 0)
Set this to 1 to enable the Pico Co-Processor Interface (PCPI).

22
picorv32.v
View File

@ -30,6 +30,8 @@ module picorv32 #(
parameter [ 0:0] ENABLE_REGS_16_31 = 1,
parameter [ 0:0] ENABLE_REGS_DUALPORT = 1,
parameter [ 0:0] LATCHED_MEM_RDATA = 0,
parameter [ 0:0] CATCH_MISALIGN = 1,
parameter [ 0:0] CATCH_ILLINSN = 1,
parameter [ 0:0] ENABLE_PCPI = 0,
parameter [ 0:0] ENABLE_MUL = 0,
parameter [ 0:0] ENABLE_IRQ = 0,
@ -280,7 +282,7 @@ module picorv32 #(
reg is_alu_reg_reg;
reg is_compare;
assign instr_trap = !{instr_lui, instr_auipc, instr_jal, instr_jalr,
assign instr_trap = (CATCH_ILLINSN || ENABLE_PCPI) && !{instr_lui, instr_auipc, instr_jal, instr_jalr,
instr_beq, instr_bne, instr_blt, instr_bge, instr_bltu, instr_bgeu,
instr_lb, instr_lh, instr_lw, instr_lbu, instr_lhu, instr_sb, instr_sh, instr_sw,
instr_addi, instr_slti, instr_sltiu, instr_xori, instr_ori, instr_andi, instr_slli, instr_srli, instr_srai,
@ -569,8 +571,8 @@ module picorv32 #(
reg_alu_out <= alu_out;
if (WITH_PCPI) begin
if (pcpi_valid && !pcpi_int_wait) begin
if (WITH_PCPI && CATCH_ILLINSN) begin
if (resetn && pcpi_valid && !pcpi_int_wait) begin
if (pcpi_timeout_counter)
pcpi_timeout_counter <= pcpi_timeout_counter - 1;
end else
@ -710,7 +712,7 @@ module picorv32 #(
`ifdef DEBUG
$display("DECODE: 0x%08x %-0s", reg_pc, instruction ? instruction : "UNKNOWN");
`endif
if (instr_trap) begin
if ((CATCH_ILLINSN || WITH_PCPI) && instr_trap) begin
if (WITH_PCPI) begin
reg_op1 <= decoded_rs1 ? cpuregs[decoded_rs1] : 0;
if (ENABLE_REGS_DUALPORT) begin
@ -724,7 +726,7 @@ module picorv32 #(
latched_store <= pcpi_int_wr;
cpu_state <= cpu_state_fetch;
end else
if (pcpi_timeout) begin
if (CATCH_ILLINSN && pcpi_timeout) begin
`ifdef DEBUG
$display("SBREAK OR UNSUPPORTED INSN AT 0x%08x", reg_pc);
`endif
@ -848,7 +850,7 @@ module picorv32 #(
latched_store <= pcpi_int_wr;
cpu_state <= cpu_state_fetch;
end else
if (pcpi_timeout) begin
if (CATCH_ILLINSN && pcpi_timeout) begin
`ifdef DEBUG
$display("SBREAK OR UNSUPPORTED INSN AT 0x%08x", reg_pc);
`endif
@ -962,7 +964,7 @@ module picorv32 #(
end
endcase
if (resetn && (mem_do_rdata || mem_do_wdata)) begin
if (CATCH_MISALIGN && resetn && (mem_do_rdata || mem_do_wdata)) begin
if (mem_wordsize == 0 && reg_op1[1:0] != 0) begin
`ifdef DEBUG
$display("MISALIGNED WORD: 0x%08x", reg_op1);
@ -982,7 +984,7 @@ module picorv32 #(
cpu_state <= cpu_state_trap;
end
end
if (resetn && mem_do_rinst && reg_pc[1:0] != 0) begin
if (CATCH_MISALIGN && resetn && mem_do_rinst && reg_pc[1:0] != 0) begin
`ifdef DEBUG
$display("MISALIGNED INSTRUCTION: 0x%08x", reg_pc);
`endif
@ -1149,6 +1151,8 @@ module picorv32_axi #(
parameter [ 0:0] ENABLE_COUNTERS = 1,
parameter [ 0:0] ENABLE_REGS_16_31 = 1,
parameter [ 0:0] ENABLE_REGS_DUALPORT = 1,
parameter [ 0:0] CATCH_MISALIGN = 1,
parameter [ 0:0] CATCH_ILLINSN = 1,
parameter [ 0:0] ENABLE_PCPI = 0,
parameter [ 0:0] ENABLE_MUL = 0,
parameter [ 0:0] ENABLE_IRQ = 0,
@ -1241,6 +1245,8 @@ module picorv32_axi #(
.ENABLE_COUNTERS (ENABLE_COUNTERS ),
.ENABLE_REGS_16_31 (ENABLE_REGS_16_31 ),
.ENABLE_REGS_DUALPORT(ENABLE_REGS_DUALPORT),
.CATCH_MISALIGN (CATCH_MISALIGN ),
.CATCH_ILLINSN (CATCH_ILLINSN ),
.ENABLE_PCPI (ENABLE_PCPI ),
.ENABLE_MUL (ENABLE_MUL ),
.ENABLE_IRQ (ENABLE_IRQ ),