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/* $OpenBSD: trap.c,v 1.11 2020/06/22 16:58:20 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/user.h>
#include <sys/syscall.h>
#include <sys/syscall_mi.h>
#include <sys/systm.h>
#include <uvm/uvm_extern.h>
#ifdef DDB
#include <machine/db_machdep.h>
#endif
#include <machine/trap.h>
void decr_intr(struct trapframe *); /* clock.c */
void hvi_intr(struct trapframe *); /* intr.c */
void syscall(struct trapframe *); /* syscall.c */
void
trap(struct trapframe *frame)
{
struct cpu_info *ci = curcpu();
struct proc *p = curproc;
int type = frame->exc;
struct vm_map *map;
vaddr_t va;
int ftype;
int error;
switch (type) {
case EXC_DECR:
decr_intr(frame);
return;
case EXC_HVI:
hvi_intr(frame);
return;
}
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 < VM_MAXUSER_ADDRESS) {
map = &p->p_vmspace->vm_map;
}
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)
printf("DSI onfault\n");
printf("dar 0x%lx dsisr 0x%lx\n", frame->dar, frame->dsisr);
goto fatal;
case EXC_DSE:
if (curpcb->pcb_onfault)
printf("DSE onfault\n");
printf("dar 0x%lx dsisr 0x%lx\n", frame->dar, frame->dsisr);
goto fatal;
case EXC_ISI|EXC_USER:
case EXC_ISE|EXC_USER:
intr_enable();
map = &p->p_vmspace->vm_map;
va = frame->srr0;
ftype = PROT_READ | PROT_EXEC;
error = uvm_fault(map, trunc_page(va), 0, ftype);
KERNEL_UNLOCK();
if (error)
goto fatal;
break;
case EXC_SC|EXC_USER:
intr_enable();
syscall(frame);
return;
case EXC_AST|EXC_USER:
p->p_md.md_astpending = 0;
intr_enable();
uvmexp.softs++;
mi_ast(p, ci->ci_want_resched);
break;
default:
fatal:
panic("trap type %lx srr1 %lx at %lx lr %lx",
frame->exc, frame->srr1, frame->srr0, frame->lr);
}
userret(p);
}
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