diff options
Diffstat (limited to 'sim/tic80/interp.c')
| -rw-r--r-- | sim/tic80/interp.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sim/tic80/interp.c b/sim/tic80/interp.c index 24cfad1..e013302 100644 --- a/sim/tic80/interp.c +++ b/sim/tic80/interp.c @@ -114,6 +114,7 @@ engine_run_until_stop (SIM_DESC sd, do { instruction_word insn = IMEM (cia); + cpu->reg[0] = 0; /* force r0 to always contain 0 */ cia = idecode_issue (sd, insn, cia); } while (*keep_running); @@ -135,6 +136,7 @@ engine_step (SIM_DESC sd) sd->restart_ok = 1; cia = cpu->cia; insn = IMEM (cia); + cpu->reg[0] = 0; /* force r0 to always contain 0 */ cia = idecode_issue (sd, insn, cia); engine_halt (sd, cpu, cia, sim_stopped, SIGTRAP); } |