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Change semantic of single step instruction

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This commit is contained in:
Florian Zaruba 2017-08-17 15:31:43 +02:00
parent d6932fb517
commit 25da717d83
1 changed files with 7 additions and 3 deletions
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10
src/debug_unit.sv
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@ -109,7 +109,7 @@ module debug_unit (
// update the previous PC if got a valid commit
dbg_ppc_n = (commit_ack_i) ? commit_instr_i.pc : dbg_ppc_q;
// flag to indicate that we came from a reset state
reset_n = (commit_ack_i) ? 1'b0 : reset_q;
reset_n = (commit_instr_i.valid) ? 1'b0 : reset_q;
// debug registers
dbg_ie_n = dbg_ie_q;
dbg_cause_n = dbg_cause_q;
@ -302,10 +302,14 @@ module debug_unit (
if (resume_req || debug_resume_i)
NS = RUNNING;
// resume from single step, check if single stepping is enabled and if the sticky bit is cleared
if (dbg_ss_q && !dbg_hit_q) begin
// resume from single step, check if single stepping is enabled and if we exited debug mode
if (dbg_ss_q && resume_req) begin
NS = SINGLE_STEP;
end
// we are setting a new PC -> continue execution until the new PC reaches the commit stage
if (debug_set_pc_o)
NS = HALT_REQ;
end
endcase