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Implement badaddr() and trap machine-check in badaddr.

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This commit is contained in:
tsubai 1999-03-15 01:29:07 +00:00
parent ef79649fc1
commit b4374e3ce0
1 changed files with 72 additions and 1 deletions
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73
sys/arch/powerpc/powerpc/trap.c
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@ -1,4 +1,4 @@
/* $NetBSD: trap.c,v 1.15 1999/01/10 10:24:17 tsubai Exp $ */
/* $NetBSD: trap.c,v 1.16 1999/03/15 01:29:07 tsubai Exp $ */
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
@ -291,6 +291,22 @@ syscall_bad:
trapsignal(p, SIGILL, EXC_PGM);
break;
case EXC_MCHK:
{
faultbuf *fb;
if (fb = p->p_addr->u_pcb.pcb_onfault) {
frame->srr0 = (*fb)[0];
frame->fixreg[1] = (*fb)[1];
frame->fixreg[2] = (*fb)[2];
frame->cr = (*fb)[3];
bcopy(&(*fb)[4], &frame->fixreg[13],
19 * sizeof(register_t));
return;
}
}
goto brain_damage;
default:
brain_damage:
printf("trap type %x at %x\n", type, frame->srr0);
@ -479,3 +495,58 @@ kcopy(src, dst, len)
return 0;
}
#endif
int
badaddr(addr, size)
void *addr;
size_t size;
{
return badaddr_read(addr, size, NULL);
}
int
badaddr_read(addr, size, rptr)
void *addr;
size_t size;
int *rptr;
{
faultbuf env;
int x;
/* Get rid of any stale machine checks that have been waiting. */
__asm __volatile ("sync; isync");
if (setfault(env)) {
curpcb->pcb_onfault = 0;
__asm __volatile ("sync");
return 1;
}
__asm __volatile ("sync");
switch (size) {
case 1:
x = *(volatile int8_t *)addr;
break;
case 2:
x = *(volatile int16_t *)addr;
break;
case 4:
x = *(volatile int32_t *)addr;
break;
default:
panic("badaddr: invalid size (%d)", size);
}
/* Make sure we took the machine check, if we caused one. */
__asm __volatile ("sync; isync");
curpcb->pcb_onfault = 0;
__asm __volatile ("sync"); /* To be sure. */
/* Use the value to avoid reorder. */
if (rptr)
*rptr = x;
return 0;
}