diff options
Diffstat (limited to 'sim/mn10300/interp.c')
| -rw-r--r-- | sim/mn10300/interp.c | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/sim/mn10300/interp.c b/sim/mn10300/interp.c index d5e833e097e..12dffff8766 100644 --- a/sim/mn10300/interp.c +++ b/sim/mn10300/interp.c @@ -1329,19 +1329,39 @@ program_interrupt (SIM_DESC sd, { int status; struct hw *device; + static int in_interrupt = 0; #ifdef SIM_CPU_EXCEPTION_TRIGGER SIM_CPU_EXCEPTION_TRIGGER(sd,cpu,cia); #endif - /* copy NMI handler code from dv-mn103cpu.c */ - /* XXX: possible infinite recursion if these store_*() calls fail! */ - store_word (SP - 4, CIA_GET (cpu)); - store_half (SP - 8, PSW); + /* avoid infinite recursion */ + if (in_interrupt) + { + (*mn10300_callback->printf_filtered) (mn10300_callback, + "ERROR: recursion in program_interrupt during software exception dispatch."); + } + else + { + in_interrupt = 1; + /* copy NMI handler code from dv-mn103cpu.c */ + store_word (SP - 4, CIA_GET (cpu)); + store_half (SP - 8, PSW); + + /* Set the SYSEF flag in NMICR by backdoor method. See + dv-mn103int.c:write_icr(). This is necessary because + software exceptions are not modelled by actually talking to + the interrupt controller, so it cannot set its own SYSEF + flag. */ + if ((NULL != board) && (strcmp(board, BOARD_AM32) == 0)) + store_byte (0x34000103, 0x04); + } + PSW &= ~PSW_IE; SP = SP - 8; CIA_SET (cpu, 0x40000008); + in_interrupt = 0; sim_engine_halt(sd, cpu, NULL, cia, sim_stopped, sig); } |