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[RTL] Fix single stepping on exceptions

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When we single step over an instruction that causes an exception DPC
should be set to point to the exception handler (where we would have
gone were we not single stepping).
This commit is contained in:
Greg Chadwick 2019-10-15 12:12:15 +01:00
parent b94961402c
commit cc94bc8d54
1 changed files with 6 additions and 3 deletions
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9
rtl/ibex_controller.sv
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@ -566,10 +566,13 @@ module ibex_controller (
end
end // exc_req_q
// single stepping
// set exception registers, but do not jump into handler [Debug Spec v0.13.2, p.44]
// Entering debug mode due to either single step or debug_req. Ensure
// registers are set for exception but then enter debug handler rather
// than exception handler [Debug Spec v0.13.2, p.44]
// Leave all other signals as is to ensure CSRs and PC get set as if
// core was entering exception handler, entry to debug mode will then
// see the appropriate state and setup dpc correctly.
if (enter_debug_mode) begin
pc_set_o = 1'b0;
ctrl_fsm_ns = DBG_TAKEN_IF;
end
end // FLUSH