This is the mail archive of the
gdb-patches@sources.redhat.com
mailing list for the GDB project.
RFA: fix simulator's handling of exceptions
- To: gdb-patches at sources dot redhat dot com
- Subject: RFA: fix simulator's handling of exceptions
- From: Jim Blandy <jimb at zwingli dot cygnus dot com>
- Date: Sat, 5 May 2001 16:01:30 -0500 (EST)
This patch could be totally inept, but with luck, you can see what I
have in mind. Please clue me in.
2001-05-05 Jim Blandy <jimb@redhat.com>
* interp.c (program_interrupt): Don't try to emulate the
processor's behavior when it hits a breakpoint, unless we're
in the OPERATING_ENVIRONMENT.
Index: sim/mn10300/interp.c
===================================================================
RCS file: /cvs/cvsfiles/devo/sim/mn10300/interp.c,v
retrieving revision 1.48
diff -c -r1.48 interp.c
*** sim/mn10300/interp.c 2000/05/29 18:53:02 1.48
--- sim/mn10300/interp.c 2001/05/05 20:58:50
***************
*** 1348,1376 ****
/* 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);
--- 1348,1382 ----
/* avoid infinite recursion */
if (in_interrupt)
+ (*mn10300_callback->printf_filtered) (mn10300_callback,
+ "ERROR: recursion in program_interrupt during software exception dispatch.");
+
+ in_interrupt = 1;
+
+ /* Don't try to simulate the processor's response to the interrupt,
+ unless we're in OPERATING_ENVIRONMENT, where the sim is
+ explicitly responsible for such things. When running under GDB,
+ we don't actually need this behavior, and if our SP is garbage,
+ the stores can raise exceptions of their own that mask the
+ underlying interrupt. */
+ if (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)
{
/* 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);