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[rtl] Fix debug step over EBREAK issue

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- If there is a request to enter debug mode (either due to a halt
  request or single stepping mode) on the same cycle as an EBREAK
  instruction, continue with the EBREAK and capture the ID PC rather
  than the IF PC.
- relates to #1106

Signed-off-by: Tom Roberts <tomroberts@lowrisc.org>
This commit is contained in:
Tom Roberts 2020-09-14 13:56:29 +01:00 • committed by Tom Roberts
parent c31d066130
commit 2c22c1ee01
1 changed files with 4 additions and 1 deletions
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5
rtl/ibex_controller.sv
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@ -766,7 +766,10 @@ module ibex_controller #(
// 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
// If an EBREAK instruction is causing us to enter debug mode on the
// same cycle as a debug_req or single step, honor the EBREAK and
// proceed to DBG_TAKEN_ID.
if (enter_debug_mode && !(ebrk_insn_prio && ebreak_into_debug)) begin
ctrl_fsm_ns = DBG_TAKEN_IF;
end
end // FLUSH