ref: d916a4c3823f55227ffae35738c2497256e307b5
dir: /os/mpc/faultpower.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "ureg.h"
#include "io.h"
enum
{
MC_IFETCH = (1<<30),
MC_STORE = (1<<11), /* bit 23 if X-form, bit 3 if D-form => write */
DSI_STORE = (1<<25),
DSI_PROT = (1<<27),
};
void
faultpower(Ureg *ur)
{
ulong addr;
char buf[ERRMAX];
int read, i;
addr = ur->pc; /* assume instr. exception */
read = 1;
i = ur->cause >> 8;
if(i == CDSI || i == CDTLBE || i == CMCHECK && (ur->status&MC_IFETCH) == 0) { /* data access error including machine check load/store */
addr = getdar();
if(getdsisr() & (DSI_STORE|MC_STORE))
read = 0;
} else if(i == CDMISS) /* DTLB miss */
addr = getdepn() & ~0x3FF; /* can't distinguish read/write, but Inferno doesn't care */
/*
print("fault %lux %lux %lux %d\n", ur->pc, ur->cause, addr, read);
print("imiss %lux dmiss %lux hash1 %lux dcmp %lux hash2 %lux\n",
getimiss(), getdmiss(), gethash1(), getdcmp(), gethash2());
print("up %lux %lux %lux\n", m->upage, m->upage->virt, m->upage->phys);
*/
up->dbgreg = ur; /* For remote ACID */
spllo();
sprint(buf, "trap: fault %s pc=0x%lux addr=0x%lux",
read ? "read" : "write", ur->pc, addr);
if(up->type == Interp)
disfault(ur, buf);
dumpregs(ur);
panic("fault: %s\n", buf);
}