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* Stop other cpus when one cpu enters DDB and restart them after it

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leaves.
* Add a sync.i instruction to the code which writes out breakpoints to
  ensure that the breakpoint is seem by all cpus in the coherence domain.
This commit is contained in:
Doug Rabson 2002-03-15 11:12:08 +00:00
parent 68a6b5e1ba
commit 0ab3e3b15a
1 changed files with 47 additions and 11 deletions
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58
sys/ia64/ia64/db_interface.c
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@ -282,6 +282,9 @@ ddbprinttrap(int vector)
printf("ddbprinttrap(%d)\n", vector);
}
#define CPUSTOP_ON_DDBBREAK
#define VERBOSE_CPUSTOP_ON_DDBBREAK
/*
* ddb_trap - field a kernel trap
*/
@ -323,6 +326,26 @@ kdb_trap(int vector, struct trapframe *regs)
* XXX Should switch to DDB's own stack, here.
*/
s = cpu_critical_enter();
#ifdef SMP
#ifdef CPUSTOP_ON_DDBBREAK
#if defined(VERBOSE_CPUSTOP_ON_DDBBREAK)
db_printf("CPU%d stopping CPUs: 0x%08x...", PCPU_GET(cpuid),
PCPU_GET(other_cpus));
#endif /* VERBOSE_CPUSTOP_ON_DDBBREAK */
/* We stop all CPUs except ourselves (obviously) */
stop_cpus(PCPU_GET(other_cpus));
#if defined(VERBOSE_CPUSTOP_ON_DDBBREAK)
db_printf(" stopped.\n");
#endif /* VERBOSE_CPUSTOP_ON_DDBBREAK */
#endif /* CPUSTOP_ON_DDBBREAK */
#endif /* SMP */
ddb_regs = *regs;
/*
@ -333,14 +356,6 @@ kdb_trap(int vector, struct trapframe *regs)
__asm __volatile("flushrs"); /* so we can look at them */
s = cpu_critical_enter();
#if 0
db_printf("stopping %x\n", PCPU_GET(other_cpus));
stop_cpus(PCPU_GET(other_cpus));
db_printf("stopped_cpus=%x\n", stopped_cpus);
#endif
db_active++;
if (ddb_mode) {
@ -352,13 +367,33 @@ kdb_trap(int vector, struct trapframe *regs)
db_active--;
#if 0
#ifdef SMP
#ifdef CPUSTOP_ON_DDBBREAK
#if defined(VERBOSE_CPUSTOP_ON_DDBBREAK)
db_printf("CPU%d restarting CPUs: 0x%08x...", PCPU_GET(cpuid),
stopped_cpus);
#endif /* VERBOSE_CPUSTOP_ON_DDBBREAK */
/* Restart all the CPUs we previously stopped */
if (stopped_cpus != PCPU_GET(other_cpus) && smp_started != 0) {
db_printf("whoa, other_cpus: 0x%08x, stopped_cpus: 0x%08x\n",
PCPU_GET(other_cpus), stopped_cpus);
panic("stop_cpus() failed");
}
restart_cpus(stopped_cpus);
#endif
#if defined(VERBOSE_CPUSTOP_ON_DDBBREAK)
db_printf(" restarted.\n");
#endif /* VERBOSE_CPUSTOP_ON_DDBBREAK */
#endif /* CPUSTOP_ON_DDBBREAK */
#endif /* SMP */
*regs = ddb_regs;
cpu_critical_exit(s);
*regs = ddb_regs;
/*
* Tell caller "We HAVE handled the trap."
@ -466,6 +501,7 @@ db_write_bundle(db_addr_t addr, struct ia64_bundle *bp)
db_write_bytes(addr+8, 8, (caddr_t) &high);
ia64_fc(addr);
ia64_sync_i();
}
void