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tb: Test ROM execution protection

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Mikael Ågren 2025-02-14 13:33:44 +01:00
parent 0ee971e38c
commit 969df46315
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1 changed files with 56 additions and 0 deletions
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56
hw/application_fpga/core/tk1/tb/tb_tk1.v
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@ -64,6 +64,9 @@ module tb_tk1 ();
localparam APP_RAM_START = 32'h40000000;
localparam ROM_START = 32'h00000000;
localparam ROM_END = 32'h00001fff;
//----------------------------------------------------------------
// Register and Wire declarations.
//----------------------------------------------------------------
@ -1067,6 +1070,58 @@ module tb_tk1 ();
endtask // test11
//----------------------------------------------------------------
// test12()
// Test ROM execution protection. Test trapping at ROM edges while
// executing in different contexts.
//----------------------------------------------------------------
task test12;
begin
tc_ctr = tc_ctr + 1;
restore_mem_bus();
$display("");
$display("--- test12: ROM execution allowed in firmware mode.");
reset_dut();
fetch_instruction(ROM_START);
check_equal(tb_force_trap, 0);
fetch_instruction(ROM_END);
check_equal(tb_force_trap, 0);
$display("--- test12: ROM execution not allowed in app mode.");
reset_dut();
fetch_instruction(APP_RAM_START);
fetch_instruction(ROM_START);
check_equal(tb_force_trap, 1);
reset_dut();
fetch_instruction(APP_RAM_START);
fetch_instruction(ROM_END);
check_equal(tb_force_trap, 1);
$display("--- test12: ROM execution allowed in syscalls made from app mode.");
reset_dut();
fetch_instruction(APP_RAM_START);
tb_syscall = 1;
fetch_instruction(ROM_START);
check_equal(tb_force_trap, 0);
fetch_instruction(ROM_END);
check_equal(tb_force_trap, 0);
$display("--- test12: Leave syscall.");
tb_syscall = 0;
$display("--- test12: completed.");
$display("");
end
endtask // test12
//----------------------------------------------------------------
// exit_with_error_code()
//
@ -1107,6 +1162,7 @@ module tb_tk1 ();
test9();
test10();
test11();
test12();
display_test_result();
$display("");