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/* $OpenBSD: trap.c,v 1.26 2020/07/10 18:34:24 kettenis Exp $ */
/*
* Copyright (c) 2020 Mark Kettenis <kettenis@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/signalvar.h>
#include <sys/user.h>
#include <sys/syscall.h>
#include <sys/syscall_mi.h>
#include <sys/systm.h>
#include <uvm/uvm_extern.h>
#include <machine/fpu.h>
#include <machine/pte.h>
#include <machine/trap.h>
#ifdef DDB
#include <machine/db_machdep.h>
#endif
void decr_intr(struct trapframe *); /* clock.c */
void hvi_intr(struct trapframe *); /* intr.c */
void syscall(struct trapframe *); /* syscall.c */
void dumpframe(struct trapframe *);
void
trap(struct trapframe *frame)
{
struct cpu_info *ci = curcpu();
struct proc *p = curproc;
int type = frame->exc;
union sigval sv;
struct vm_map *map;
struct slb_desc *slbd;
pmap_t pm;
vaddr_t va;
int ftype;
int error, sig, code;
/* Disable access to floating-point and vector registers. */
mtmsr(mfmsr() & ~(PSL_FP|PSL_VEC|PSL_VSX));
switch (type) {
case EXC_DECR:
uvmexp.intrs++;
ci->ci_idepth++;
decr_intr(frame);
ci->ci_idepth--;
return;
case EXC_HVI:
uvmexp.intrs++;
ci->ci_idepth++;
hvi_intr(frame);
ci->ci_idepth--;
return;
case EXC_SC:
uvmexp.syscalls++;
break;
default:
uvmexp.traps++;
break;
}
if (frame->srr1 & PSL_EE)
intr_enable();
if (frame->srr1 & PSL_PR) {
type |= EXC_USER;
p->p_md.md_regs = frame;
refreshcreds(p);
}
switch (type) {
#ifdef DDB
case EXC_PGM:
/* At a trap instruction, enter the debugger. */
if (frame->srr1 & EXC_PGM_TRAP) {
/* Return from db_enter(). */
if (frame->srr0 == (register_t)db_enter)
frame->srr0 = frame->lr;
db_ktrap(T_BREAKPOINT, frame);
return;
}
break;
case EXC_TRC:
db_ktrap(T_BREAKPOINT, frame); /* single-stepping */
return;
#endif
case EXC_DSI:
map = kernel_map;
va = frame->dar;
if (curpcb->pcb_onfault &&
(va >> ADDR_ESID_SHIFT) == USER_ESID) {
map = &p->p_vmspace->vm_map;
va = curpcb->pcb_userva | (va & SEGMENT_MASK);
}
if (frame->dsisr & DSISR_STORE)
ftype = PROT_READ | PROT_WRITE;
else
ftype = PROT_READ;
KERNEL_LOCK();
if (uvm_fault(map, trunc_page(va), 0, ftype) == 0) {
KERNEL_UNLOCK();
return;
}
KERNEL_UNLOCK();
if (curpcb->pcb_onfault) {
frame->srr0 = curpcb->pcb_onfault;
return;
}
printf("dar 0x%lx dsisr 0x%lx\n", frame->dar, frame->dsisr);
goto fatal;
case EXC_DSE:
/*
* If we sleep while handling a fault, we may lose our
* SLB entry. Enter it again.
*/
va = frame->dar;
if (curpcb->pcb_onfault &&
(va >> ADDR_ESID_SHIFT) == USER_ESID) {
map = &p->p_vmspace->vm_map;
va = curpcb->pcb_userva | (va & SEGMENT_MASK);
if (pmap_set_user_slb(map->pmap, va, NULL, NULL) == 0)
return;
}
if (curpcb->pcb_onfault) {
frame->srr0 = curpcb->pcb_onfault;
return;
}
printf("dar 0x%lx dsisr 0x%lx\n", frame->dar, frame->dsisr);
goto fatal;
case EXC_DSE|EXC_USER:
pm = p->p_vmspace->vm_map.pmap;
slbd = pmap_slbd_lookup(pm, frame->dar);
if (slbd) {
pmap_slbd_cache(pm, slbd);
break;
}
frame->dsisr = 0;
/* FALLTHROUGH */
case EXC_DSI|EXC_USER:
map = &p->p_vmspace->vm_map;
va = frame->dar;
if (frame->dsisr & DSISR_STORE)
ftype = PROT_READ | PROT_WRITE;
else
ftype = PROT_READ;
KERNEL_LOCK();
error = uvm_fault(map, trunc_page(va), 0, ftype);
KERNEL_UNLOCK();
if (error) {
printf("type %x dar 0x%lx dsisr 0x%lx %s\r\n",
type, frame->dar, frame->dsisr, p->p_p->ps_comm);
dumpframe(frame);
if (error == ENOMEM) {
sig = SIGKILL;
code = 0;
} else if (error == EIO) {
sig = SIGBUS;
code = BUS_OBJERR;
} else if (error == EACCES) {
sig = SIGSEGV;
code = SEGV_ACCERR;
} else {
sig = SIGSEGV;
code = SEGV_MAPERR;
}
sv.sival_ptr = (void *)va;
KERNEL_LOCK();
trapsignal(p, sig, 0, code, sv);
KERNEL_UNLOCK();
}
break;
case EXC_ISE|EXC_USER:
pm = p->p_vmspace->vm_map.pmap;
slbd = pmap_slbd_lookup(pm, frame->srr0);
if (slbd) {
pmap_slbd_cache(pm, slbd);
break;
}
/* FALLTHROUGH */
case EXC_ISI|EXC_USER:
map = &p->p_vmspace->vm_map;
va = frame->srr0;
ftype = PROT_READ | PROT_EXEC;
KERNEL_LOCK();
error = uvm_fault(map, trunc_page(va), 0, ftype);
KERNEL_UNLOCK();
if (error) {
printf("type %x srr0 0x%lx %s\r\n",
type, frame->srr0, p->p_p->ps_comm);
dumpframe(frame);
if (error == ENOMEM) {
sig = SIGKILL;
code = 0;
} else if (error == EIO) {
sig = SIGBUS;
code = BUS_OBJERR;
} else if (error == EACCES) {
sig = SIGSEGV;
code = SEGV_ACCERR;
} else {
sig = SIGSEGV;
code = SEGV_MAPERR;
}
sv.sival_ptr = (void *)va;
KERNEL_LOCK();
trapsignal(p, sig, 0, code, sv);
KERNEL_UNLOCK();
}
break;
case EXC_SC|EXC_USER:
syscall(frame);
return;
case EXC_AST|EXC_USER:
p->p_md.md_astpending = 0;
uvmexp.softs++;
mi_ast(p, ci->ci_want_resched);
break;
case EXC_ALI|EXC_USER:
sv.sival_ptr = (void *)frame->dar;
KERNEL_LOCK();
trapsignal(p, SIGBUS, 0, BUS_ADRALN, sv);
KERNEL_UNLOCK();
break;
case EXC_PGM|EXC_USER:
printf("type %x srr0 0x%lx\r\n", type, frame->srr0);
dumpframe(frame);
sv.sival_ptr = (void *)frame->srr0;
KERNEL_LOCK();
trapsignal(p, SIGTRAP, 0, TRAP_BRKPT, sv);
KERNEL_UNLOCK();
break;
case EXC_FPU|EXC_USER:
restore_vsx(p);
curpcb->pcb_flags |= PCB_FP;
frame->srr1 |= PSL_FP;
break;
case EXC_VEC|EXC_USER:
restore_vsx(p);
curpcb->pcb_flags |= PCB_VEC;
frame->srr1 |= PSL_VEC;
break;
default:
fatal:
panic("trap type %x srr1 %lx at %lx lr %lx",
type, frame->srr1, frame->srr0, frame->lr);
}
userret(p);
}
#include <machine/opal.h>
void
dumpframe(struct trapframe *frame)
{
int i;
for (i = 0; i < 32; i++)
opal_printf("r%d 0x%lx\r\n", i, frame->fixreg[i]);
opal_printf("ctr 0x%lx\r\n", frame->ctr);
opal_printf("xer 0x%lx\r\n", frame->xer);
opal_printf("cr 0x%lx\r\n", frame->cr);
opal_printf("lr 0x%lx\r\n", frame->lr);
opal_printf("srr0 0x%lx\r\n", frame->srr0);
opal_printf("srr1 0x%lx\r\n", frame->srr1);
}
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