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yosys/tests/openmsp430/rtl/omsp_dbg_hwbrk.v

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//----------------------------------------------------------------------------
// Copyright (C) 2009 , Olivier Girard
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the authors nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
// OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE
//
//----------------------------------------------------------------------------
//
// *File Name: omsp_dbg_hwbrk.v
//
// *Module Description:
// Hardware Breakpoint / Watchpoint module
//
// *Author(s):
// - Olivier Girard, olgirard@gmail.com
//
//----------------------------------------------------------------------------
// $Rev: 117 $
// $LastChangedBy: olivier.girard $
// $LastChangedDate: 2011-06-23 21:30:51 +0200 (Thu, 23 Jun 2011) $
//----------------------------------------------------------------------------
`ifdef OMSP_NO_INCLUDE
`else
`include "openMSP430_defines.v"
`endif
module omsp_dbg_hwbrk (
// OUTPUTs
brk_halt, // Hardware breakpoint command
brk_pnd, // Hardware break/watch-point pending
brk_dout, // Hardware break/watch-point register data input
// INPUTs
brk_reg_rd, // Hardware break/watch-point register read select
brk_reg_wr, // Hardware break/watch-point register write select
dbg_clk, // Debug unit clock
dbg_din, // Debug register data input
dbg_rst, // Debug unit reset
eu_mab, // Execution-Unit Memory address bus
eu_mb_en, // Execution-Unit Memory bus enable
eu_mb_wr, // Execution-Unit Memory bus write transfer
eu_mdb_in, // Memory data bus input
eu_mdb_out, // Memory data bus output
exec_done, // Execution completed
fe_mb_en, // Frontend Memory bus enable
pc // Program counter
);
// OUTPUTs
//=========
output brk_halt; // Hardware breakpoint command
output brk_pnd; // Hardware break/watch-point pending
output [15:0] brk_dout; // Hardware break/watch-point register data input
// INPUTs
//=========
input [3:0] brk_reg_rd; // Hardware break/watch-point register read select
input [3:0] brk_reg_wr; // Hardware break/watch-point register write select
input dbg_clk; // Debug unit clock
input [15:0] dbg_din; // Debug register data input
input dbg_rst; // Debug unit reset
input [15:0] eu_mab; // Execution-Unit Memory address bus
input eu_mb_en; // Execution-Unit Memory bus enable
input [1:0] eu_mb_wr; // Execution-Unit Memory bus write transfer
input [15:0] eu_mdb_in; // Memory data bus input
input [15:0] eu_mdb_out; // Memory data bus output
input exec_done; // Execution completed
input fe_mb_en; // Frontend Memory bus enable
input [15:0] pc; // Program counter
//=============================================================================
// 1) WIRE & PARAMETER DECLARATION
//=============================================================================
wire range_wr_set;
wire range_rd_set;
wire addr1_wr_set;
wire addr1_rd_set;
wire addr0_wr_set;
wire addr0_rd_set;
parameter BRK_CTL = 0,
BRK_STAT = 1,
BRK_ADDR0 = 2,
BRK_ADDR1 = 3;
//=============================================================================
// 2) CONFIGURATION REGISTERS
//=============================================================================
// BRK_CTL Register
//-----------------------------------------------------------------------------
// 7 6 5 4 3 2 1 0
// Reserved RANGE_MODE INST_EN BREAK_EN ACCESS_MODE
//
// ACCESS_MODE: - 00 : Disabled
// - 01 : Detect read access
// - 10 : Detect write access
// - 11 : Detect read/write access
// NOTE: '10' & '11' modes are not supported on the instruction flow
//
// BREAK_EN: - 0 : Watchmode enable
// - 1 : Break enable
//
// INST_EN: - 0 : Checks are done on the execution unit (data flow)
// - 1 : Checks are done on the frontend (instruction flow)
//
// RANGE_MODE: - 0 : Address match on BRK_ADDR0 or BRK_ADDR1
// - 1 : Address match on BRK_ADDR0->BRK_ADDR1 range
//
//-----------------------------------------------------------------------------
reg [4:0] brk_ctl;
wire brk_ctl_wr = brk_reg_wr[BRK_CTL];
always @ (posedge dbg_clk or posedge dbg_rst)
if (dbg_rst) brk_ctl <= 5'h00;
else if (brk_ctl_wr) brk_ctl <= {`HWBRK_RANGE & dbg_din[4], dbg_din[3:0]};
wire [7:0] brk_ctl_full = {3'b000, brk_ctl};
// BRK_STAT Register
//-----------------------------------------------------------------------------
// 7 6 5 4 3 2 1 0
// Reserved RANGE_WR RANGE_RD ADDR1_WR ADDR1_RD ADDR0_WR ADDR0_RD
//-----------------------------------------------------------------------------
reg [5:0] brk_stat;
wire brk_stat_wr = brk_reg_wr[BRK_STAT];
wire [5:0] brk_stat_set = {range_wr_set & `HWBRK_RANGE,
range_rd_set & `HWBRK_RANGE,
addr1_wr_set, addr1_rd_set,
addr0_wr_set, addr0_rd_set};
wire [5:0] brk_stat_clr = ~dbg_din[5:0];
always @ (posedge dbg_clk or posedge dbg_rst)
if (dbg_rst) brk_stat <= 6'h00;
else if (brk_stat_wr) brk_stat <= ((brk_stat & brk_stat_clr) | brk_stat_set);
else brk_stat <= (brk_stat | brk_stat_set);
wire [7:0] brk_stat_full = {2'b00, brk_stat};
wire brk_pnd = |brk_stat;
// BRK_ADDR0 Register
//-----------------------------------------------------------------------------
reg [15:0] brk_addr0;
wire brk_addr0_wr = brk_reg_wr[BRK_ADDR0];
always @ (posedge dbg_clk or posedge dbg_rst)
if (dbg_rst) brk_addr0 <= 16'h0000;
else if (brk_addr0_wr) brk_addr0 <= dbg_din;
// BRK_ADDR1/DATA0 Register
//-----------------------------------------------------------------------------
reg [15:0] brk_addr1;
wire brk_addr1_wr = brk_reg_wr[BRK_ADDR1];
always @ (posedge dbg_clk or posedge dbg_rst)
if (dbg_rst) brk_addr1 <= 16'h0000;
else if (brk_addr1_wr) brk_addr1 <= dbg_din;
//============================================================================
// 3) DATA OUTPUT GENERATION
//============================================================================
wire [15:0] brk_ctl_rd = {8'h00, brk_ctl_full} & {16{brk_reg_rd[BRK_CTL]}};
wire [15:0] brk_stat_rd = {8'h00, brk_stat_full} & {16{brk_reg_rd[BRK_STAT]}};
wire [15:0] brk_addr0_rd = brk_addr0 & {16{brk_reg_rd[BRK_ADDR0]}};
wire [15:0] brk_addr1_rd = brk_addr1 & {16{brk_reg_rd[BRK_ADDR1]}};
wire [15:0] brk_dout = brk_ctl_rd |
brk_stat_rd |
brk_addr0_rd |
brk_addr1_rd;
//============================================================================
// 4) BREAKPOINT / WATCHPOINT GENERATION
//============================================================================
// Comparators
//---------------------------
// Note: here the comparison logic is instanciated several times in order
// to improve the timings, at the cost of a bit more area.
wire equ_d_addr0 = eu_mb_en & (eu_mab==brk_addr0) & ~brk_ctl[`BRK_RANGE];
wire equ_d_addr1 = eu_mb_en & (eu_mab==brk_addr1) & ~brk_ctl[`BRK_RANGE];
wire equ_d_range = eu_mb_en & ((eu_mab>=brk_addr0) & (eu_mab<=brk_addr1)) &
brk_ctl[`BRK_RANGE] & `HWBRK_RANGE;
reg fe_mb_en_buf;
always @ (posedge dbg_clk or posedge dbg_rst)
if (dbg_rst) fe_mb_en_buf <= 1'b0;
else fe_mb_en_buf <= fe_mb_en;
wire equ_i_addr0 = fe_mb_en_buf & (pc==brk_addr0) & ~brk_ctl[`BRK_RANGE];
wire equ_i_addr1 = fe_mb_en_buf & (pc==brk_addr1) & ~brk_ctl[`BRK_RANGE];
wire equ_i_range = fe_mb_en_buf & ((pc>=brk_addr0) & (pc<=brk_addr1)) &
brk_ctl[`BRK_RANGE] & `HWBRK_RANGE;
// Detect accesses
//---------------------------
// Detect Instruction read access
wire i_addr0_rd = equ_i_addr0 & brk_ctl[`BRK_I_EN];
wire i_addr1_rd = equ_i_addr1 & brk_ctl[`BRK_I_EN];
wire i_range_rd = equ_i_range & brk_ctl[`BRK_I_EN];
// Detect Execution-Unit write access
wire d_addr0_wr = equ_d_addr0 & ~brk_ctl[`BRK_I_EN] & |eu_mb_wr;
wire d_addr1_wr = equ_d_addr1 & ~brk_ctl[`BRK_I_EN] & |eu_mb_wr;
wire d_range_wr = equ_d_range & ~brk_ctl[`BRK_I_EN] & |eu_mb_wr;
// Detect DATA read access
// Whenever an "ADD r9. &0x200" instruction is executed, &0x200 will be read
// before being written back. In that case, the read flag should not be set.
// In general, We should here make sure no write access occures during the
// same instruction cycle before setting the read flag.
reg [2:0] d_rd_trig;
always @ (posedge dbg_clk or posedge dbg_rst)
if (dbg_rst) d_rd_trig <= 3'h0;
else if (exec_done) d_rd_trig <= 3'h0;
else d_rd_trig <= {equ_d_range & ~brk_ctl[`BRK_I_EN] & ~|eu_mb_wr,
equ_d_addr1 & ~brk_ctl[`BRK_I_EN] & ~|eu_mb_wr,
equ_d_addr0 & ~brk_ctl[`BRK_I_EN] & ~|eu_mb_wr};
wire d_addr0_rd = d_rd_trig[0] & exec_done & ~d_addr0_wr;
wire d_addr1_rd = d_rd_trig[1] & exec_done & ~d_addr1_wr;
wire d_range_rd = d_rd_trig[2] & exec_done & ~d_range_wr;
// Set flags
assign addr0_rd_set = brk_ctl[`BRK_MODE_RD] & (d_addr0_rd | i_addr0_rd);
assign addr0_wr_set = brk_ctl[`BRK_MODE_WR] & d_addr0_wr;
assign addr1_rd_set = brk_ctl[`BRK_MODE_RD] & (d_addr1_rd | i_addr1_rd);
assign addr1_wr_set = brk_ctl[`BRK_MODE_WR] & d_addr1_wr;
assign range_rd_set = brk_ctl[`BRK_MODE_RD] & (d_range_rd | i_range_rd);
assign range_wr_set = brk_ctl[`BRK_MODE_WR] & d_range_wr;
// Break CPU
assign brk_halt = brk_ctl[`BRK_EN] & |brk_stat_set;
endmodule // omsp_dbg_hwbrk
`ifdef OMSP_NO_INCLUDE
`else
`include "openMSP430_undefines.v"
`endif
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