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Make sure r0 == 0; Return EINVAL for system calls that are defined but not provided; Provide traps 74-79 as debugging traps

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This commit is contained in:
Michael Meissner 1997-05-13 22:04:32 +00:00
parent af942f1dc2
commit 1b6f4dde35
3 changed files with 37 additions and 0 deletions
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9
sim/tic80/ChangeLog
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@ -1,3 +1,12 @@
Tue May 13 18:00:10 1997 Mike Meissner <meissner@cygnus.com>
* insns (do_trap): For system calls that are defined, but not
provided return EINVAL. Temporarily add traps 74-79 to just print
the register state.
* interp.c (engine_{run_until_stop,step}): Before executing
instructions, make sure r0 == 0.
Tue May 13 16:39:37 1997 Andrew Cagney <cagney@b1.cygnus.com>
* alu.h (IMEM): Take full cia not just IP as argument.

26
sim/tic80/insns
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@ -1005,6 +1005,7 @@ void::function::do_swcr:int Dest, signed32 rSource, signed32 cr
// trap
void::function::do_trap:unsigned32 trap_number
int i;
TRACE_SINK1 (MY_INDEX, trap_number);
switch (trap_number)
{
@ -1041,6 +1042,12 @@ void::function::do_trap:unsigned32 trap_number
break;
}
default:
/* For system calls which are defined, just return EINVAL instead of trapping */
if (GPR(15) <= 204)
{
GPR(2) = -22; /* -EINVAL */
break;
}
engine_error (SD, CPU, cia,
"0x%lx: unknown syscall %d",
(unsigned long) cia.ip, GPR(15));
@ -1048,6 +1055,25 @@ void::function::do_trap:unsigned32 trap_number
break;
case 73:
engine_halt (SD, CPU, cia, sim_stopped, SIGTRAP);
/* Add a few traps for now to print the register state */
case 74:
case 75:
case 76:
case 77:
case 78:
case 79:
if (!TRACE_ALU_P (CPU))
trace_one_insn (SD, CPU, cia.ip, 1, itable[MY_INDEX].file,
itable[MY_INDEX].line_nr, "trap",
"Trap %d", trap_number);
for (i = 0; i < 32; i++)
sim_io_eprintf (SD, "%s0x%.8lx%s", ((i % 8) == 0) ? "\t" : " ", (long)GPR(i),
(((i+1) % 8) == 0) ? "\n" : "");
sim_io_write_stderr (SD, "\n", 1);
break;
default:
engine_error (SD, CPU, cia,
"0x%lx: unsupported trap %d",

2
sim/tic80/interp.c
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@ -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);
}