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Clean up the trap handling code and make it consistent with the other platforms.

Browse Source 
Submitted by:	jhb
This commit is contained in:
mp 2001-11-05 00:49:03 +00:00
parent a5a36e7719
commit 6bc922a656
7 changed files with 915 additions and 633 deletions
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38
sys/powerpc/aim/locore.S
View File

@ -927,35 +927,16 @@ s_trap:
FRAME_SETUP(tempsave)
/* Now we can recover interrupts again: */
mfmsr 7
ori 7,7,(PSL_EE|PSL_ME|PSL_RI)@l
ori 7,7,(PSL_EE|PSL_FP|PSL_ME|PSL_RI)@l
mtmsr 7
isync
/* Call C trap code: */
trapagain:
addi 3,1,8
mr 30,3
bl trap
trapexit:
/* Disable interrupts: */
mfmsr 3
andi. 3,3,~PSL_EE@l
mtmsr 3
/* Test AST pending: */
lwz 5,FRAME_SRR1+8(1)
mtcr 5
bc 4,17,1f /* branch if PSL_PR is false */
lis 3,astpending@ha
lwz 4,astpending@l(3)
andi. 4,4,1
beq 1f
#if 0 /* XXX */
li 6,EXC_AST
#endif
stw 6,FRAME_EXC+8(1)
b trapagain
1:
#if 0
mr 3,30
bl ast
FRAME_LEAVE(tempsave)
#endif
rfi
/*
@ -971,7 +952,10 @@ fork_trampoline:
mtlr 31
mr 3,30
blrl /* jump indirect to r31 */
b trapexit
mr 3,30
bl ast
FRAME_LEAVE(tempsave)
rfi
/*
* DSI second stage fault handler
@ -1129,10 +1113,6 @@ intr_exit:
lwz 3,GD_CURPCB(3) /* get curpcb from globaldata */
lwz 3,PCB_PMR(3) /* get pmap real address from curpcb */
mtsr KERNEL_SR,3
lis 3,astpending@ha /* Test AST pending */
lwz 4,astpending@l(3)
andi. 4,4,1
beq 1f
/* Setup for entry to realtrap: */
lwz 3,0(1) /* get saved SP */
mtsprg 1,3
@ -1152,7 +1132,7 @@ intr_exit:
lwz 31,intr_depth@l(30)
addi 31,31,-1
stw 31,intr_depth@l(30)
b realtrap
b realtrap /* XXX: should call ast(frame ptr) */
1:
/* Here is the normal exit of extintr: */
lwz 5,36(1)

713
sys/powerpc/aim/trap.c
View File

@ -41,16 +41,27 @@ static const char rcsid[] =
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/ktr.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/pioctl.h>
#include <sys/reboot.h>
#include <sys/syscall.h>
#include <sys/sysent.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <sys/user.h>
#ifdef KTRACE
#include <sys/ktrace.h>
#endif
#include <sys/vmmeter.h>
#include <vm/vm.h>
#include <vm/vm_kern.h>
#include <vm/pmap.h>
#include <vm/vm_extern.h>
#include <vm/vm_kern.h>
#include <vm/vm_map.h>
#include <vm/vm_param.h>
#include <machine/cpu.h>
#include <machine/frame.h>
@ -63,306 +74,466 @@ static const char rcsid[] =
#define NARGREG 8 /* 8 args are in registers */
#define MOREARGS(sp) ((caddr_t)((int)(sp) + 8)) /* more args go here */
volatile int astpending;
volatile int want_resched;
#ifdef WITNESS
extern char *syscallnames[];
#endif
#if 0 /* XXX: not used yet */
static int fix_unaligned __P((struct proc *p, struct trapframe *frame));
#endif
static void trap_fatal __P((struct trapframe *frame));
static void printtrap __P((int vector, struct trapframe *frame, int isfatal,
int user));
static int trap_pfault __P((struct trapframe *frame, int user));
static int handle_onfault (struct trapframe *frame);
static const char *ppc_exception_names[] = {
"Reserved 0", /* 0 */
"Reset", /* 1 */
"Machine Check", /* 2 */
"Data Storage Interrupt", /* 3 */
"Instruction Storage Interrupt", /* 4 */
"External Interrupt", /* 5 */
"Alignment Interrupt", /* 6 */
"Program Interrupt", /* 7 */
"Floating Point Unavailable", /* 8 */
"Decrementer Interrupt", /* 9 */
"Reserved", /* 10 */
"Reserved", /* 11 */
"System Call", /* 12 */
"Trace", /* 13 */
"Floating Point Assist", /* 14 */
"Performance Monitoring", /* 15 */
"Instruction TLB Miss", /* 16 */
"Data Load TLB Miss", /* 17 */
"Data Store TLB Miss", /* 18 */
"Instruction Breakpoint", /* 19 */
"System Management Interrupt", /* 20 */
"Reserved 21", /* 21 */
"Reserved 22", /* 22 */
"Reserved 23", /* 23 */
"Reserved 24", /* 24 */
"Reserved 25", /* 25 */
"Reserved 26", /* 26 */
"Reserved 27", /* 27 */
"Reserved 28", /* 28 */
"Reserved 29", /* 29 */
"Reserved 30", /* 30 */
"Reserved 31", /* 31 */
"Reserved 32", /* 32 */
"Reserved 33", /* 33 */
"Reserved 34", /* 34 */
"Reserved 35", /* 35 */
"Reserved 36", /* 36 */
"Reserved 37", /* 37 */
"Reserved 38", /* 38 */
"Reserved 39", /* 39 */
"Reserved 40", /* 40 */
"Reserved 41", /* 41 */
"Reserved 42", /* 42 */
"Reserved 43", /* 43 */
"Reserved 44", /* 44 */
"Reserved 45", /* 45 */
"Reserved 46", /* 46 */
"Reserved 47", /* 47 */
};
static void
printtrap __P((int vector, struct trapframe *frame, int isfatal, int user))
{
printf("\n");
printf("%s %s trap:\n", isfatal ? "fatal" : "handled",
user ? "user" : "kernel");
printf("\n");
printf(" exception = 0x%x (%s)\n", vector >> 8,
ppc_exception_names[vector >> 8]);
switch (vector) {
case EXC_DSI:
printf(" virtual address = 0x%x\n", frame->dar);
break;
case EXC_ISI:
printf(" virtual address = 0x%x\n", frame->srr0);
break;
}
printf(" srr0 = 0x%x", frame->srr0);
printf(" curthread = %p\n", curthread);
if (curthread != NULL)
printf(" pid = %d, comm = %s\n",
curthread->td_proc->p_pid, curthread->td_proc->p_comm);
printf("\n");
}
static void
trap_fatal(struct trapframe *frame)
{
printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR));
#ifdef DDB
if ((debugger_on_panic || db_active) && kdb_trap(frame->exc, 0, frame))
return;
#endif
panic("%s Trap", ppc_exception_names[frame->exc >> 8]);
}
/*
* Handles a fatal fault when we have onfault state to recover. Returns
* non-zero if there was onfault recovery state available.
*/
static int
handle_onfault (struct trapframe *frame)
{
struct thread *td;
faultbuf *fb;
td = curthread;
fb = td->td_pcb->pcb_onfault;
if (fb != NULL) {
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 (1);
}
return (0);
}
void
trap(struct trapframe *frame)
{
#if 0 /* XXX: This code hasn't been reworked yet. */
struct thread *td;
struct proc *p;
int type;
u_int sticks;
int sig, type, user;
u_int sticks, ucode;
atomic_add_int(&cnt.v_trap, 1);
td = curthread;
p = td->td_proc;
p = curproc;
type = frame->exc;
ucode = type;
sig = 0;
user = (frame->srr1 & PSL_PR);
sticks = 0;
if (frame->srr1 & PSL_PR) {
type |= EXC_USER;
sticks = p->p_sticks;
}
CTR3(KTR_TRAP, "trap: %s type=%s (%s)", p->p_comm,
ppc_exception_names[type >> 8],
user ? "user" : "kernel");
switch (type) {
case EXC_TRC|EXC_USER:
frame->srr1 &= ~PSL_SE;
trapsignal(p, SIGTRAP, EXC_TRC);
break;
case EXC_DSI:
{
vm_map_t map;
vaddr_t va;
int ftype;
faultbuf *fb;
map = kernel_map;
va = frame->dar;
if ((va >> ADDR_SR_SHFT) == USER_SR) {
sr_t user_sr;
__asm ("mfsr %0, %1"
: "=r"(user_sr) : "K"(USER_SR));
va &= ADDR_PIDX | ADDR_POFF;
va |= user_sr << ADDR_SR_SHFT;
map = &p->p_vmspace->vm_map;
}
if (frame->dsisr & DSISR_STORE)
ftype = VM_PROT_READ | VM_PROT_WRITE;
else
ftype = VM_PROT_READ;
if (uvm_fault(map, trunc_page(va), 0, ftype)
== KERN_SUCCESS)
return;
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;
}
map = kernel_map;
}
goto brain_damage;
case EXC_DSI|EXC_USER:
{
int ftype, rv;
if (frame->dsisr & DSISR_STORE)
ftype = VM_PROT_READ | VM_PROT_WRITE;
else
ftype = VM_PROT_READ;
if ((rv = uvm_fault(&p->p_vmspace->vm_map,
trunc_page(frame->dar), 0, ftype))
== KERN_SUCCESS)
break;
if (rv == KERN_RESOURCE_SHORTAGE) {
printf("UVM: pid %d (%s), uid %d killed: "
"out of swap\n",
p->p_pid, p->p_comm,
p->p_cred && p->p_ucred ?
p->p_ucred->cr_uid : -1);
trapsignal(p, SIGKILL, EXC_DSI);
} else {
trapsignal(p, SIGSEGV, EXC_DSI);
}
}
break;
case EXC_ISI|EXC_USER:
{
int ftype;
ftype = VM_PROT_READ | VM_PROT_EXECUTE;
if (uvm_fault(&p->p_vmspace->vm_map,
trunc_page(frame->srr0), 0, ftype)
== KERN_SUCCESS)
break;
}
trapsignal(p, SIGSEGV, EXC_ISI);
break;
case EXC_SC|EXC_USER:
{
struct sysent *callp;
size_t argsize;
register_t code, error;
register_t *params, rval[2];
int nsys, n;
register_t args[10];
uvmexp.syscalls++;
nsys = p->p_emul->e_nsysent;
callp = p->p_emul->e_sysent;
code = frame->fixreg[0];
params = frame->fixreg + FIRSTARG;
switch (code) {
case SYS_syscall:
/*
* code is first argument,
* followed by actual args.
*/
code = *params++;
break;
case SYS___syscall:
/*
* Like syscall, but code is a quad,
* so as to maintain quad alignment
* for the rest of the args.
*/
if (callp != sysent)
break;
params++;
code = *params++;
break;
default:
break;
}
if (code < 0 || code >= nsys)
callp += p->p_emul->e_nosys;
else
callp += code;
argsize = callp->sy_argsize;
n = NARGREG - (params - (frame->fixreg + FIRSTARG));
if (argsize > n * sizeof(register_t)) {
bcopy(params, args, n * sizeof(register_t));
if (error = copyin(MOREARGS(frame->fixreg[1]),
args + n,
argsize - n * sizeof(register_t))) {
#ifdef KTRACE
/* Can't get all the arguments! */
if (KTRPOINT(p, KTR_SYSCALL))
ktrsyscall(p, code, argsize,
args);
#endif
goto syscall_bad;
}
params = args;
}
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSCALL))
ktrsyscall(p, code, argsize, params);
#endif
rval[0] = 0;
rval[1] = frame->fixreg[FIRSTARG + 1];
switch (error = (*callp->sy_call)(p, params, rval)) {
case 0:
frame->fixreg[FIRSTARG] = rval[0];
frame->fixreg[FIRSTARG + 1] = rval[1];
frame->cr &= ~0x10000000;
break;
case ERESTART:
/*
* Set user's pc back to redo the system call.
*/
frame->srr0 -= 4;
break;
case EJUSTRETURN:
/* nothing to do */
break;
default:
syscall_bad:
if (p->p_emul->e_errno)
error = p->p_emul->e_errno[error];
frame->fixreg[FIRSTARG] = error;
frame->cr |= 0x10000000;
break;
}
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSRET))
ktrsysret(p, code, error, rval[0]);
#endif
}
break;
if (user) {
sticks = td->td_kse->ke_sticks;
td->td_frame = frame;
KASSERT(td->td_ucred == NULL, ("already have a ucred"));
PROC_LOCK(p);
td->td_ucred = crhold(p->p_ucred);
PROC_UNLOCK(p);
case EXC_FPU|EXC_USER:
if (fpuproc)
save_fpu(fpuproc);
fpuproc = p;
enable_fpu(p);
break;
/* User Mode Traps */
switch (type) {
case EXC_TRC:
frame->srr1 &= ~PSL_SE;
sig = SIGTRAP;
break;
case EXC_DSI:
case EXC_ISI:
sig = trap_pfault(frame, 1);
break;
case EXC_SC:
syscall(frame);
break;
case EXC_FPU:
enable_fpu(PCPU_GET(curpcb));
frame->srr1 |= PSL_FP;
break;
case EXC_AST|EXC_USER:
/* This is just here that we trap */
break;
case EXC_ALI|EXC_USER:
case EXC_ALI:
#if 0
if (fix_unaligned(p, frame) != 0)
trapsignal(p, SIGBUS, EXC_ALI);
#endif
sig = SIGBUS;
#if 0
else
frame->srr0 += 4;
#endif
break;
case EXC_PGM|EXC_USER:
/* XXX temporarily */
if (frame->srr1 & 0x0002000)
trapsignal(p, SIGTRAP, EXC_PGM);
else
trapsignal(p, SIGILL, EXC_PGM);
break;
case EXC_PGM:
/* XXX temporarily */
/* XXX: Magic Number? */
if (frame->srr1 & 0x0002000)
sig = SIGTRAP;
else
sig = SIGILL;
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;
}
default:
trap_fatal(frame);
}
goto brain_damage;
} else {
/* Kernel Mode Traps */
default:
brain_damage:
printf("trap type %x at %x\n", type, frame->srr0);
#ifdef DDB
Debugger(); /* XXX temporarily */
#endif
#ifdef TRAP_PANICWAIT
printf("Press a key to panic.\n");
cngetc();
#endif
panic("trap");
KASSERT(cold || td->td_ucred != NULL,
("kernel trap doesn't have ucred"));
switch (type) {
case EXC_DSI:
if (trap_pfault(frame, 0) == 0)
return;
break;
case EXC_MCHK:
if (handle_onfault(frame))
return;
break;
default:
trap_fatal(frame);
}
}
astpending = 0; /* we are about to do it */
uvmexp.softs++;
if (p->p_flag & P_OWEUPC) {
p->p_flag &= ~P_OWEUPC;
ADDUPROF(p);
if (sig != 0) {
if (p->p_sysent->sv_transtrap != NULL)
sig = (p->p_sysent->sv_transtrap)(sig, type);
trapsignal(p, sig, ucode);
}
userret(td, frame, sticks);
mtx_assert(&Giant, MA_NOTOWNED);
mtx_lock(&Giant);
crfree(td->td_ucred);
mtx_unlock(&Giant);
td->td_ucred = NULL;
}
/* take pending signals */
{
int sig;
void
syscall(struct trapframe *frame)
{
caddr_t params;
struct sysent *callp;
struct thread *td;
struct proc *p;
int error, n;
size_t narg;
register_t args[10];
u_int code;
while (sig = CURSIG(p))
postsig(sig);
}
td = curthread;
p = td->td_proc;
p->p_priority = p->p_usrpri;
if (want_resched) {
int sig;
atomic_add_int(&cnt.v_syscall, 1);
code = frame->fixreg[0];
params = (caddr_t) (frame->fixreg + FIRSTARG);
if (p->p_sysent->sv_prepsyscall)
/*
* We are being preempted.
* The prep code is MP aware.
*/
preempt(NULL);
while (sig = CURSIG(p))
postsig(sig);
(*p->p_sysent->sv_prepsyscall)(frame, args, &code, &params);
else if (code == SYS_syscall)
/*
* code is first argument,
* followed by actual args.
*/
code = *params++;
else if (code == SYS___syscall) {
/*
* Like syscall, but code is a quad,
* so as to maintain quad alignment
* for the rest of the args.
*/
params++;
code = *params++;
}
/*
* If profiling, charge recent system time to the trapped pc.
*/
if (p->p_flag & P_PROFIL) {
extern int psratio;
if (p->p_sysent->sv_mask)
code &= p->p_sysent->sv_mask;
addupc_task(p, frame->srr0,
(int)(p->p_sticks - sticks) * psratio);
}
/*
* If someone stole the fpu while we were away, disable it
*/
if (p != fpuproc)
frame->srr1 &= ~PSL_FP;
curcpu()->ci_schedstate.spc_curpriority = p->p_priority;
if (code >= p->p_sysent->sv_size)
callp = &p->p_sysent->sv_table[0];
else
callp = &p->p_sysent->sv_table[code];
narg = callp->sy_narg & SYF_ARGMASK;
n = NARGREG - (params - (caddr_t)(frame->fixreg + FIRSTARG));
if (narg > n * sizeof(register_t)) {
bcopy(params, args, n * sizeof(register_t));
if (error = copyin(MOREARGS(frame->fixreg[1]), args + n,
narg - n * sizeof(register_t))) {
#ifdef KTRACE
/* Can't get all the arguments! */
if (KTRPOINT(p, KTR_SYSCALL))
ktrsyscall(p->p_tracep, code, narg, args);
#endif
goto bad;
}
params = (caddr_t) args;
}
/*
* Try to run the syscall without Giant if the syscall is MP safe.
*/
if ((callp->sy_narg & SYF_MPSAFE) == 0)
mtx_lock(&Giant);
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSCALL))
ktrsyscall(p->p_tracep, code, narg, params);
#endif
td->td_retval[0] = 0;
td->td_retval[1] = frame->fixreg[FIRSTARG + 1];
STOPEVENT(p, S_SCE, narg);
error = (*callp->sy_call)(td, args);
switch (error) {
case 0:
frame->fixreg[FIRSTARG] = td->td_retval[0];
frame->fixreg[FIRSTARG + 1] = td->td_retval[1];
/* XXX: Magic number */
frame->cr &= ~0x10000000;
break;
case ERESTART:
/*
* Set user's pc back to redo the system call.
*/
frame->srr0 -= 4;
break;
case EJUSTRETURN:
/* nothing to do */
break;
default:
bad:
if (p->p_sysent->sv_errsize) {
if (error >= p->p_sysent->sv_errsize)
error = -1; /* XXX */
else
error = p->p_sysent->sv_errtbl[error];
}
frame->fixreg[FIRSTARG] = error;
/* XXX: Magic number: Carry Flag Equivalent? */
frame->cr |= 0x10000000;
break;
}
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSRET))
ktrsysret(p->p_tracep, code, error, td->td_retval[0]);
#endif
if ((callp->sy_narg & SYF_MPSAFE) == 0)
mtx_unlock(&Giant);
/*
* Does the comment in the i386 code about errno apply here?
*/
STOPEVENT(p, S_SCX, code);
#ifdef WITNESS
if (witness_list(td)) {
panic("system call %s returning with mutex(s) held\n",
syscallnames[code]);
}
#endif
mtx_assert(&sched_lock, MA_NOTOWNED);
mtx_assert(&Giant, MA_NOTOWNED);
}
static int
trap_pfault(struct trapframe *frame, int user)
{
vm_offset_t eva, va;
struct thread *td;
struct proc *p;
vm_map_t map;
vm_prot_t ftype;
int rv;
td = curthread;
p = td->td_proc;
if (frame->exc == EXC_ISI) {
eva = frame->srr0;
ftype = VM_PROT_READ | VM_PROT_EXECUTE;
} else {
eva = frame->dar;
if (frame->dsisr & DSISR_STORE)
ftype = VM_PROT_READ | VM_PROT_WRITE;
else
ftype = VM_PROT_READ;
}
if ((eva >> ADDR_SR_SHFT) != USER_SR) {
if (user)
return (SIGSEGV);
map = kernel_map;
} else {
sr_t user_sr;
if (p->p_vmspace == NULL)
return (SIGSEGV);
__asm ("mfsr %0, %1"
: "=r"(user_sr)
: "K"(USER_SR));
eva &= ADDR_PIDX | ADDR_POFF;
eva |= user_sr << ADDR_SR_SHFT;
map = &p->p_vmspace->vm_map;
}
va = trunc_page(eva);
mtx_lock(&Giant);
if (map != kernel_map) {
/*
* Keep swapout from messing with us during this
* critical time.
*/
PROC_LOCK(p);
++p->p_lock;
PROC_UNLOCK(p);
/*
* Grow the stack if necessary
*/
/* grow_stack returns false only if va falls into
* a growable stack region and the stack growth
* fails. It returns true if va was not within
* a growable stack region, or if the stack
* growth succeeded.
*/
if (!grow_stack (p, va))
rv = KERN_FAILURE;
else
/* Fault in the user page: */
rv = vm_fault(map, va, ftype,
(ftype & VM_PROT_WRITE) ? VM_FAULT_DIRTY
: VM_FAULT_NORMAL);
PROC_LOCK(p);
--p->p_lock;
PROC_UNLOCK(p);
} else {
/*
* Don't have to worry about process locking or stacks in the
* kernel.
*/
rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL);
}
mtx_unlock(&Giant);
if (rv == KERN_SUCCESS)
return (0);
if (!user && handle_onfault(frame))
return (0);
return (SIGSEGV);
}
#if 0 /* XXX: child_return not used */
/*
* XXX: the trapframe return values should be setup in vm_machdep.c in
* cpu_fork().
*/
void
child_return(void *arg)
{
@ -576,18 +747,20 @@ fix_unaligned(p, frame)
* the FPRs, and that their current state is in
* the PCB.
*/
if (fpuproc != p) {
if (fpuproc)
save_fpu(fpuproc);
enable_fpu(p);
if (!(pcb->pcb_flags & PCB_FPU))
enable_fpu(PCPU_GET(curpcb));
frame->srr1 |= PSL_FP;
}
save_fpu(p);
save_fpu(PCPU_GET(curpcb));
if (indicator == EXC_ALI_LFD) {
if (copyin((void *)frame->dar, fpr,
sizeof(double)) != 0)
return -1;
enable_fpu(p);
if (!(pcb->pcb_flags & PCB_FPU))
enable_fpu(PCPU_GET(curpcb));
frame->srr1 |= PSL_FP;
}
} else {
if (copyout(fpr, (void *)frame->dar,
sizeof(double)) != 0)

3
sys/powerpc/include/cpu.h
View File

@ -53,9 +53,6 @@
void delay(int);
#define DELAY(n) delay(n)
extern int want_resched;
extern int astpending;
extern char bootpath[];
#if defined(_KERNEL) || defined(_STANDALONE)

5
sys/powerpc/include/trap.h
View File

@ -52,7 +52,7 @@
/* The following are only available on 604: */
#define EXC_PERF 0x0f00 /* Performance Monitoring */
#define EXC_BPT 0x1300 /* Instruction Breakpoint */
#define EXC_SMI 0x1400 /* System Managment Interrupt */
#define EXC_SMI 0x1400 /* System Management Interrupt */
/* And these are only on the 603: */
#define EXC_IMISS 0x1000 /* Instruction translation miss */
@ -61,8 +61,6 @@
#define EXC_LAST 0x2f00 /* Last possible exception vector */
#define EXC_AST 0x3000 /* Fake AST vector */
/* Trap was in user mode */
#define EXC_USER 0x10000
@ -87,6 +85,7 @@
#ifndef LOCORE
void trap(struct trapframe *);
void syscall(struct trapframe *);
#endif /* !LOCORE */

38
sys/powerpc/powerpc/locore.S
View File

@ -927,35 +927,16 @@ s_trap:
FRAME_SETUP(tempsave)
/* Now we can recover interrupts again: */
mfmsr 7
ori 7,7,(PSL_EE|PSL_ME|PSL_RI)@l
ori 7,7,(PSL_EE|PSL_FP|PSL_ME|PSL_RI)@l
mtmsr 7
isync
/* Call C trap code: */
trapagain:
addi 3,1,8
mr 30,3
bl trap
trapexit:
/* Disable interrupts: */
mfmsr 3
andi. 3,3,~PSL_EE@l
mtmsr 3
/* Test AST pending: */
lwz 5,FRAME_SRR1+8(1)
mtcr 5
bc 4,17,1f /* branch if PSL_PR is false */
lis 3,astpending@ha
lwz 4,astpending@l(3)
andi. 4,4,1
beq 1f
#if 0 /* XXX */
li 6,EXC_AST
#endif
stw 6,FRAME_EXC+8(1)
b trapagain
1:
#if 0
mr 3,30
bl ast
FRAME_LEAVE(tempsave)
#endif
rfi
/*
@ -971,7 +952,10 @@ fork_trampoline:
mtlr 31
mr 3,30
blrl /* jump indirect to r31 */
b trapexit
mr 3,30
bl ast
FRAME_LEAVE(tempsave)
rfi
/*
* DSI second stage fault handler
@ -1129,10 +1113,6 @@ intr_exit:
lwz 3,GD_CURPCB(3) /* get curpcb from globaldata */
lwz 3,PCB_PMR(3) /* get pmap real address from curpcb */
mtsr KERNEL_SR,3
lis 3,astpending@ha /* Test AST pending */
lwz 4,astpending@l(3)
andi. 4,4,1
beq 1f
/* Setup for entry to realtrap: */
lwz 3,0(1) /* get saved SP */
mtsprg 1,3
@ -1152,7 +1132,7 @@ intr_exit:
lwz 31,intr_depth@l(30)
addi 31,31,-1
stw 31,intr_depth@l(30)
b realtrap
b realtrap /* XXX: should call ast(frame ptr) */
1:
/* Here is the normal exit of extintr: */
lwz 5,36(1)

38
sys/powerpc/powerpc/locore.s
View File

@ -927,35 +927,16 @@ s_trap:
FRAME_SETUP(tempsave)
/* Now we can recover interrupts again: */
mfmsr 7
ori 7,7,(PSL_EE|PSL_ME|PSL_RI)@l
ori 7,7,(PSL_EE|PSL_FP|PSL_ME|PSL_RI)@l
mtmsr 7
isync
/* Call C trap code: */
trapagain:
addi 3,1,8
mr 30,3
bl trap
trapexit:
/* Disable interrupts: */
mfmsr 3
andi. 3,3,~PSL_EE@l
mtmsr 3
/* Test AST pending: */
lwz 5,FRAME_SRR1+8(1)
mtcr 5
bc 4,17,1f /* branch if PSL_PR is false */
lis 3,astpending@ha
lwz 4,astpending@l(3)
andi. 4,4,1
beq 1f
#if 0 /* XXX */
li 6,EXC_AST
#endif
stw 6,FRAME_EXC+8(1)
b trapagain
1:
#if 0
mr 3,30
bl ast
FRAME_LEAVE(tempsave)
#endif
rfi
/*
@ -971,7 +952,10 @@ fork_trampoline:
mtlr 31
mr 3,30
blrl /* jump indirect to r31 */
b trapexit
mr 3,30
bl ast
FRAME_LEAVE(tempsave)
rfi
/*
* DSI second stage fault handler
@ -1129,10 +1113,6 @@ intr_exit:
lwz 3,GD_CURPCB(3) /* get curpcb from globaldata */
lwz 3,PCB_PMR(3) /* get pmap real address from curpcb */
mtsr KERNEL_SR,3
lis 3,astpending@ha /* Test AST pending */
lwz 4,astpending@l(3)
andi. 4,4,1
beq 1f
/* Setup for entry to realtrap: */
lwz 3,0(1) /* get saved SP */
mtsprg 1,3
@ -1152,7 +1132,7 @@ intr_exit:
lwz 31,intr_depth@l(30)
addi 31,31,-1
stw 31,intr_depth@l(30)
b realtrap
b realtrap /* XXX: should call ast(frame ptr) */
1:
/* Here is the normal exit of extintr: */
lwz 5,36(1)

713
sys/powerpc/powerpc/trap.c
View File

@ -41,16 +41,27 @@ static const char rcsid[] =
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/ktr.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/pioctl.h>
#include <sys/reboot.h>
#include <sys/syscall.h>
#include <sys/sysent.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <sys/user.h>
#ifdef KTRACE
#include <sys/ktrace.h>
#endif
#include <sys/vmmeter.h>
#include <vm/vm.h>
#include <vm/vm_kern.h>
#include <vm/pmap.h>
#include <vm/vm_extern.h>
#include <vm/vm_kern.h>
#include <vm/vm_map.h>
#include <vm/vm_param.h>
#include <machine/cpu.h>
#include <machine/frame.h>
@ -63,306 +74,466 @@ static const char rcsid[] =
#define NARGREG 8 /* 8 args are in registers */
#define MOREARGS(sp) ((caddr_t)((int)(sp) + 8)) /* more args go here */
volatile int astpending;
volatile int want_resched;
#ifdef WITNESS
extern char *syscallnames[];
#endif
#if 0 /* XXX: not used yet */
static int fix_unaligned __P((struct proc *p, struct trapframe *frame));
#endif
static void trap_fatal __P((struct trapframe *frame));
static void printtrap __P((int vector, struct trapframe *frame, int isfatal,
int user));
static int trap_pfault __P((struct trapframe *frame, int user));
static int handle_onfault (struct trapframe *frame);
static const char *ppc_exception_names[] = {
"Reserved 0", /* 0 */
"Reset", /* 1 */
"Machine Check", /* 2 */
"Data Storage Interrupt", /* 3 */
"Instruction Storage Interrupt", /* 4 */
"External Interrupt", /* 5 */
"Alignment Interrupt", /* 6 */
"Program Interrupt", /* 7 */
"Floating Point Unavailable", /* 8 */
"Decrementer Interrupt", /* 9 */
"Reserved", /* 10 */
"Reserved", /* 11 */
"System Call", /* 12 */
"Trace", /* 13 */
"Floating Point Assist", /* 14 */
"Performance Monitoring", /* 15 */
"Instruction TLB Miss", /* 16 */
"Data Load TLB Miss", /* 17 */
"Data Store TLB Miss", /* 18 */
"Instruction Breakpoint", /* 19 */
"System Management Interrupt", /* 20 */
"Reserved 21", /* 21 */
"Reserved 22", /* 22 */
"Reserved 23", /* 23 */
"Reserved 24", /* 24 */
"Reserved 25", /* 25 */
"Reserved 26", /* 26 */
"Reserved 27", /* 27 */
"Reserved 28", /* 28 */
"Reserved 29", /* 29 */
"Reserved 30", /* 30 */
"Reserved 31", /* 31 */
"Reserved 32", /* 32 */
"Reserved 33", /* 33 */
"Reserved 34", /* 34 */
"Reserved 35", /* 35 */
"Reserved 36", /* 36 */
"Reserved 37", /* 37 */
"Reserved 38", /* 38 */
"Reserved 39", /* 39 */
"Reserved 40", /* 40 */
"Reserved 41", /* 41 */
"Reserved 42", /* 42 */
"Reserved 43", /* 43 */
"Reserved 44", /* 44 */
"Reserved 45", /* 45 */
"Reserved 46", /* 46 */
"Reserved 47", /* 47 */
};
static void
printtrap __P((int vector, struct trapframe *frame, int isfatal, int user))
{
printf("\n");
printf("%s %s trap:\n", isfatal ? "fatal" : "handled",
user ? "user" : "kernel");
printf("\n");
printf(" exception = 0x%x (%s)\n", vector >> 8,
ppc_exception_names[vector >> 8]);
switch (vector) {
case EXC_DSI:
printf(" virtual address = 0x%x\n", frame->dar);
break;
case EXC_ISI:
printf(" virtual address = 0x%x\n", frame->srr0);
break;
}
printf(" srr0 = 0x%x", frame->srr0);
printf(" curthread = %p\n", curthread);
if (curthread != NULL)
printf(" pid = %d, comm = %s\n",
curthread->td_proc->p_pid, curthread->td_proc->p_comm);
printf("\n");
}
static void
trap_fatal(struct trapframe *frame)
{
printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR));
#ifdef DDB
if ((debugger_on_panic || db_active) && kdb_trap(frame->exc, 0, frame))
return;
#endif
panic("%s Trap", ppc_exception_names[frame->exc >> 8]);
}
/*
* Handles a fatal fault when we have onfault state to recover. Returns
* non-zero if there was onfault recovery state available.
*/
static int
handle_onfault (struct trapframe *frame)
{
struct thread *td;
faultbuf *fb;
td = curthread;
fb = td->td_pcb->pcb_onfault;
if (fb != NULL) {
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 (1);
}
return (0);
}
void
trap(struct trapframe *frame)
{
#if 0 /* XXX: This code hasn't been reworked yet. */
struct thread *td;
struct proc *p;
int type;
u_int sticks;
int sig, type, user;
u_int sticks, ucode;
atomic_add_int(&cnt.v_trap, 1);
td = curthread;
p = td->td_proc;
p = curproc;
type = frame->exc;
ucode = type;
sig = 0;
user = (frame->srr1 & PSL_PR);
sticks = 0;
if (frame->srr1 & PSL_PR) {
type |= EXC_USER;
sticks = p->p_sticks;
}
CTR3(KTR_TRAP, "trap: %s type=%s (%s)", p->p_comm,
ppc_exception_names[type >> 8],
user ? "user" : "kernel");
switch (type) {
case EXC_TRC|EXC_USER:
frame->srr1 &= ~PSL_SE;
trapsignal(p, SIGTRAP, EXC_TRC);
break;
case EXC_DSI:
{
vm_map_t map;
vaddr_t va;
int ftype;
faultbuf *fb;
map = kernel_map;
va = frame->dar;
if ((va >> ADDR_SR_SHFT) == USER_SR) {
sr_t user_sr;
__asm ("mfsr %0, %1"
: "=r"(user_sr) : "K"(USER_SR));
va &= ADDR_PIDX | ADDR_POFF;
va |= user_sr << ADDR_SR_SHFT;
map = &p->p_vmspace->vm_map;
}
if (frame->dsisr & DSISR_STORE)
ftype = VM_PROT_READ | VM_PROT_WRITE;
else
ftype = VM_PROT_READ;
if (uvm_fault(map, trunc_page(va), 0, ftype)
== KERN_SUCCESS)
return;
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;
}
map = kernel_map;
}
goto brain_damage;
case EXC_DSI|EXC_USER:
{
int ftype, rv;
if (frame->dsisr & DSISR_STORE)
ftype = VM_PROT_READ | VM_PROT_WRITE;
else
ftype = VM_PROT_READ;
if ((rv = uvm_fault(&p->p_vmspace->vm_map,
trunc_page(frame->dar), 0, ftype))
== KERN_SUCCESS)
break;
if (rv == KERN_RESOURCE_SHORTAGE) {
printf("UVM: pid %d (%s), uid %d killed: "
"out of swap\n",
p->p_pid, p->p_comm,
p->p_cred && p->p_ucred ?
p->p_ucred->cr_uid : -1);
trapsignal(p, SIGKILL, EXC_DSI);
} else {
trapsignal(p, SIGSEGV, EXC_DSI);
}
}
break;
case EXC_ISI|EXC_USER:
{
int ftype;
ftype = VM_PROT_READ | VM_PROT_EXECUTE;
if (uvm_fault(&p->p_vmspace->vm_map,
trunc_page(frame->srr0), 0, ftype)
== KERN_SUCCESS)
break;
}
trapsignal(p, SIGSEGV, EXC_ISI);
break;
case EXC_SC|EXC_USER:
{
struct sysent *callp;
size_t argsize;
register_t code, error;
register_t *params, rval[2];
int nsys, n;
register_t args[10];
uvmexp.syscalls++;
nsys = p->p_emul->e_nsysent;
callp = p->p_emul->e_sysent;
code = frame->fixreg[0];
params = frame->fixreg + FIRSTARG;
switch (code) {
case SYS_syscall:
/*
* code is first argument,
* followed by actual args.
*/
code = *params++;
break;
case SYS___syscall:
/*
* Like syscall, but code is a quad,
* so as to maintain quad alignment
* for the rest of the args.
*/
if (callp != sysent)
break;
params++;
code = *params++;
break;
default:
break;
}
if (code < 0 || code >= nsys)
callp += p->p_emul->e_nosys;
else
callp += code;
argsize = callp->sy_argsize;
n = NARGREG - (params - (frame->fixreg + FIRSTARG));
if (argsize > n * sizeof(register_t)) {
bcopy(params, args, n * sizeof(register_t));
if (error = copyin(MOREARGS(frame->fixreg[1]),
args + n,
argsize - n * sizeof(register_t))) {
#ifdef KTRACE
/* Can't get all the arguments! */
if (KTRPOINT(p, KTR_SYSCALL))
ktrsyscall(p, code, argsize,
args);
#endif
goto syscall_bad;
}
params = args;
}
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSCALL))
ktrsyscall(p, code, argsize, params);
#endif
rval[0] = 0;
rval[1] = frame->fixreg[FIRSTARG + 1];
switch (error = (*callp->sy_call)(p, params, rval)) {
case 0:
frame->fixreg[FIRSTARG] = rval[0];
frame->fixreg[FIRSTARG + 1] = rval[1];
frame->cr &= ~0x10000000;
break;
case ERESTART:
/*
* Set user's pc back to redo the system call.
*/
frame->srr0 -= 4;
break;
case EJUSTRETURN:
/* nothing to do */
break;
default:
syscall_bad:
if (p->p_emul->e_errno)
error = p->p_emul->e_errno[error];
frame->fixreg[FIRSTARG] = error;
frame->cr |= 0x10000000;
break;
}
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSRET))
ktrsysret(p, code, error, rval[0]);
#endif
}
break;
if (user) {
sticks = td->td_kse->ke_sticks;
td->td_frame = frame;
KASSERT(td->td_ucred == NULL, ("already have a ucred"));
PROC_LOCK(p);
td->td_ucred = crhold(p->p_ucred);
PROC_UNLOCK(p);
case EXC_FPU|EXC_USER:
if (fpuproc)
save_fpu(fpuproc);
fpuproc = p;
enable_fpu(p);
break;
/* User Mode Traps */
switch (type) {
case EXC_TRC:
frame->srr1 &= ~PSL_SE;
sig = SIGTRAP;
break;
case EXC_DSI:
case EXC_ISI:
sig = trap_pfault(frame, 1);
break;
case EXC_SC:
syscall(frame);
break;
case EXC_FPU:
enable_fpu(PCPU_GET(curpcb));
frame->srr1 |= PSL_FP;
break;
case EXC_AST|EXC_USER:
/* This is just here that we trap */
break;
case EXC_ALI|EXC_USER:
case EXC_ALI:
#if 0
if (fix_unaligned(p, frame) != 0)
trapsignal(p, SIGBUS, EXC_ALI);
#endif
sig = SIGBUS;
#if 0
else
frame->srr0 += 4;
#endif
break;
case EXC_PGM|EXC_USER:
/* XXX temporarily */
if (frame->srr1 & 0x0002000)
trapsignal(p, SIGTRAP, EXC_PGM);
else
trapsignal(p, SIGILL, EXC_PGM);
break;
case EXC_PGM:
/* XXX temporarily */
/* XXX: Magic Number? */
if (frame->srr1 & 0x0002000)
sig = SIGTRAP;
else
sig = SIGILL;
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;
}
default:
trap_fatal(frame);
}
goto brain_damage;
} else {
/* Kernel Mode Traps */
default:
brain_damage:
printf("trap type %x at %x\n", type, frame->srr0);
#ifdef DDB
Debugger(); /* XXX temporarily */
#endif
#ifdef TRAP_PANICWAIT
printf("Press a key to panic.\n");
cngetc();
#endif
panic("trap");
KASSERT(cold || td->td_ucred != NULL,
("kernel trap doesn't have ucred"));
switch (type) {
case EXC_DSI:
if (trap_pfault(frame, 0) == 0)
return;
break;
case EXC_MCHK:
if (handle_onfault(frame))
return;
break;
default:
trap_fatal(frame);
}
}
astpending = 0; /* we are about to do it */
uvmexp.softs++;
if (p->p_flag & P_OWEUPC) {
p->p_flag &= ~P_OWEUPC;
ADDUPROF(p);
if (sig != 0) {
if (p->p_sysent->sv_transtrap != NULL)
sig = (p->p_sysent->sv_transtrap)(sig, type);
trapsignal(p, sig, ucode);
}
userret(td, frame, sticks);
mtx_assert(&Giant, MA_NOTOWNED);
mtx_lock(&Giant);
crfree(td->td_ucred);
mtx_unlock(&Giant);
td->td_ucred = NULL;
}
/* take pending signals */
{
int sig;
void
syscall(struct trapframe *frame)
{
caddr_t params;
struct sysent *callp;
struct thread *td;
struct proc *p;
int error, n;
size_t narg;
register_t args[10];
u_int code;
while (sig = CURSIG(p))
postsig(sig);
}
td = curthread;
p = td->td_proc;
p->p_priority = p->p_usrpri;
if (want_resched) {
int sig;
atomic_add_int(&cnt.v_syscall, 1);
code = frame->fixreg[0];
params = (caddr_t) (frame->fixreg + FIRSTARG);
if (p->p_sysent->sv_prepsyscall)
/*
* We are being preempted.
* The prep code is MP aware.
*/
preempt(NULL);
while (sig = CURSIG(p))
postsig(sig);
(*p->p_sysent->sv_prepsyscall)(frame, args, &code, &params);
else if (code == SYS_syscall)
/*
* code is first argument,
* followed by actual args.
*/
code = *params++;
else if (code == SYS___syscall) {
/*
* Like syscall, but code is a quad,
* so as to maintain quad alignment
* for the rest of the args.
*/
params++;
code = *params++;
}
/*
* If profiling, charge recent system time to the trapped pc.
*/
if (p->p_flag & P_PROFIL) {
extern int psratio;
if (p->p_sysent->sv_mask)
code &= p->p_sysent->sv_mask;
addupc_task(p, frame->srr0,
(int)(p->p_sticks - sticks) * psratio);
}
/*
* If someone stole the fpu while we were away, disable it
*/
if (p != fpuproc)
frame->srr1 &= ~PSL_FP;
curcpu()->ci_schedstate.spc_curpriority = p->p_priority;
if (code >= p->p_sysent->sv_size)
callp = &p->p_sysent->sv_table[0];
else
callp = &p->p_sysent->sv_table[code];
narg = callp->sy_narg & SYF_ARGMASK;
n = NARGREG - (params - (caddr_t)(frame->fixreg + FIRSTARG));
if (narg > n * sizeof(register_t)) {
bcopy(params, args, n * sizeof(register_t));
if (error = copyin(MOREARGS(frame->fixreg[1]), args + n,
narg - n * sizeof(register_t))) {
#ifdef KTRACE
/* Can't get all the arguments! */
if (KTRPOINT(p, KTR_SYSCALL))
ktrsyscall(p->p_tracep, code, narg, args);
#endif
goto bad;
}
params = (caddr_t) args;
}
/*
* Try to run the syscall without Giant if the syscall is MP safe.
*/
if ((callp->sy_narg & SYF_MPSAFE) == 0)
mtx_lock(&Giant);
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSCALL))
ktrsyscall(p->p_tracep, code, narg, params);
#endif
td->td_retval[0] = 0;
td->td_retval[1] = frame->fixreg[FIRSTARG + 1];
STOPEVENT(p, S_SCE, narg);
error = (*callp->sy_call)(td, args);
switch (error) {
case 0:
frame->fixreg[FIRSTARG] = td->td_retval[0];
frame->fixreg[FIRSTARG + 1] = td->td_retval[1];
/* XXX: Magic number */
frame->cr &= ~0x10000000;
break;
case ERESTART:
/*
* Set user's pc back to redo the system call.
*/
frame->srr0 -= 4;
break;
case EJUSTRETURN:
/* nothing to do */
break;
default:
bad:
if (p->p_sysent->sv_errsize) {
if (error >= p->p_sysent->sv_errsize)
error = -1; /* XXX */
else
error = p->p_sysent->sv_errtbl[error];
}
frame->fixreg[FIRSTARG] = error;
/* XXX: Magic number: Carry Flag Equivalent? */
frame->cr |= 0x10000000;
break;
}
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSRET))
ktrsysret(p->p_tracep, code, error, td->td_retval[0]);
#endif
if ((callp->sy_narg & SYF_MPSAFE) == 0)
mtx_unlock(&Giant);
/*
* Does the comment in the i386 code about errno apply here?
*/
STOPEVENT(p, S_SCX, code);
#ifdef WITNESS
if (witness_list(td)) {
panic("system call %s returning with mutex(s) held\n",
syscallnames[code]);
}
#endif
mtx_assert(&sched_lock, MA_NOTOWNED);
mtx_assert(&Giant, MA_NOTOWNED);
}
static int
trap_pfault(struct trapframe *frame, int user)
{
vm_offset_t eva, va;
struct thread *td;
struct proc *p;
vm_map_t map;
vm_prot_t ftype;
int rv;
td = curthread;
p = td->td_proc;
if (frame->exc == EXC_ISI) {
eva = frame->srr0;
ftype = VM_PROT_READ | VM_PROT_EXECUTE;
} else {
eva = frame->dar;
if (frame->dsisr & DSISR_STORE)
ftype = VM_PROT_READ | VM_PROT_WRITE;
else
ftype = VM_PROT_READ;
}
if ((eva >> ADDR_SR_SHFT) != USER_SR) {
if (user)
return (SIGSEGV);
map = kernel_map;
} else {
sr_t user_sr;
if (p->p_vmspace == NULL)
return (SIGSEGV);
__asm ("mfsr %0, %1"
: "=r"(user_sr)
: "K"(USER_SR));
eva &= ADDR_PIDX | ADDR_POFF;
eva |= user_sr << ADDR_SR_SHFT;
map = &p->p_vmspace->vm_map;
}
va = trunc_page(eva);
mtx_lock(&Giant);
if (map != kernel_map) {
/*
* Keep swapout from messing with us during this
* critical time.
*/
PROC_LOCK(p);
++p->p_lock;
PROC_UNLOCK(p);
/*
* Grow the stack if necessary
*/
/* grow_stack returns false only if va falls into
* a growable stack region and the stack growth
* fails. It returns true if va was not within
* a growable stack region, or if the stack
* growth succeeded.
*/
if (!grow_stack (p, va))
rv = KERN_FAILURE;
else
/* Fault in the user page: */
rv = vm_fault(map, va, ftype,
(ftype & VM_PROT_WRITE) ? VM_FAULT_DIRTY
: VM_FAULT_NORMAL);
PROC_LOCK(p);
--p->p_lock;
PROC_UNLOCK(p);
} else {
/*
* Don't have to worry about process locking or stacks in the
* kernel.
*/
rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL);
}
mtx_unlock(&Giant);
if (rv == KERN_SUCCESS)
return (0);
if (!user && handle_onfault(frame))
return (0);
return (SIGSEGV);
}
#if 0 /* XXX: child_return not used */
/*
* XXX: the trapframe return values should be setup in vm_machdep.c in
* cpu_fork().
*/
void
child_return(void *arg)
{
@ -576,18 +747,20 @@ fix_unaligned(p, frame)
* the FPRs, and that their current state is in
* the PCB.
*/
if (fpuproc != p) {
if (fpuproc)
save_fpu(fpuproc);
enable_fpu(p);
if (!(pcb->pcb_flags & PCB_FPU))
enable_fpu(PCPU_GET(curpcb));
frame->srr1 |= PSL_FP;
}
save_fpu(p);
save_fpu(PCPU_GET(curpcb));
if (indicator == EXC_ALI_LFD) {
if (copyin((void *)frame->dar, fpr,
sizeof(double)) != 0)
return -1;
enable_fpu(p);
if (!(pcb->pcb_flags & PCB_FPU))
enable_fpu(PCPU_GET(curpcb));
frame->srr1 |= PSL_FP;
}
} else {
if (copyout(fpr, (void *)frame->dar,
sizeof(double)) != 0)