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NetBSD/sys/arch/sparc64/sparc64/trap.c

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/* $NetBSD: trap.c,v 1.62 2001/02/11 00:39:38 eeh Exp $ */
/*
* Copyright (c) 1996
* The President and Fellows of Harvard College. All rights reserved.
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Lawrence Berkeley Laboratory.
* This product includes software developed by Harvard University.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* This product includes software developed by Harvard University.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)trap.c 8.4 (Berkeley) 9/23/93
*/
#define NEW_FPSTATE
#include "opt_ddb.h"
#include "opt_syscall_debug.h"
#include "opt_ktrace.h"
#include "opt_compat_svr4.h"
#include "opt_compat_netbsd32.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/resource.h>
#include <sys/signal.h>
#include <sys/wait.h>
#include <sys/syscall.h>
#include <sys/syslog.h>
#ifdef KTRACE
#include <sys/ktrace.h>
#endif
#include <uvm/uvm_extern.h>
#include <machine/cpu.h>
#include <machine/ctlreg.h>
#include <machine/trap.h>
#include <machine/instr.h>
#include <machine/pmap.h>
#ifdef DDB
#include <machine/db_machdep.h>
#else
#include <machine/frame.h>
#endif
#ifdef COMPAT_SVR4
#include <machine/svr4_machdep.h>
#endif
#ifdef COMPAT_SVR4_32
#include <machine/svr4_32_machdep.h>
#endif
#include <sparc/fpu/fpu_extern.h>
#include <sparc64/sparc64/cache.h>
#ifndef offsetof
#define offsetof(s, f) ((int)&((s *)0)->f)
#endif
#ifdef DEBUG
/* What trap level are we running? */
#define tl() ({ \
int l; \
__asm __volatile("rdpr %%tl, %0" : "=r" (l) :); \
l; \
})
#endif
/* trapstats */
int trapstats = 0;
int protfix = 0;
int protmmu = 0;
int missmmu = 0;
int udmiss = 0; /* Number of normal/nucleus data/text miss/protection faults */
int udhit = 0;
int udprot = 0;
int utmiss = 0;
int kdmiss = 0;
int kdhit = 0;
int kdprot = 0;
int ktmiss = 0;
int iveccnt = 0; /* number if normal/nucleus interrupt/interrupt vector faults */
int uintrcnt = 0;
int kiveccnt = 0;
int kintrcnt = 0;
int intristk = 0; /* interrupts when already on intrstack */
int intrpoll = 0; /* interrupts not using vector lists */
int wfill = 0;
int kwfill = 0;
int wspill = 0;
int wspillskip = 0;
int rftucnt = 0;
int rftuld = 0;
int rftudone = 0;
int rftkcnt[5] = { 0, 0, 0, 0, 0 };
#ifdef DEBUG
#define RW_64 0x1
#define RW_ERR 0x2
#define RW_FOLLOW 0x4
int rwindow_debug = RW_ERR;
#define TDB_ADDFLT 0x1
#define TDB_TXTFLT 0x2
#define TDB_TRAP 0x4
#define TDB_SYSCALL 0x8
#define TDB_FOLLOW 0x10
#define TDB_FRAME 0x20
#define TDB_NSAVED 0x40
#define TDB_TL 0x80
#define TDB_STOPSIG 0x100
#define TDB_STOPCALL 0x200
#define TDB_STOPCPIO 0x400
#define TDB_SYSTOP 0x800
int trapdebug = 0/*|TDB_SYSCALL|TDB_STOPSIG|TDB_STOPCPIO|TDB_ADDFLT|TDB_FOLLOW*/;
/* #define __inline */
#endif
#ifdef DDB
#if 1
#define DEBUGGER(t,f) do { kdb_trap(t,f); } while (0)
#else
#define DEBUGGER(t,f) Debugger()
#endif
#else
#define DEBUGGER(t,f)
#define Debugger()
#endif
/*
* Initial FPU state is all registers == all 1s, everything else == all 0s.
* This makes every floating point register a signalling NaN, with sign bit
* set, no matter how it is interpreted. Appendix N of the Sparc V8 document
* seems to imply that we should do this, and it does make sense.
*/
__asm(".align 64");
struct fpstate64 initfpstate = {
{ ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0,
~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0 }
};
/*
* There are more than 100 trap types, but most are unused.
*
* Trap type 0 is taken over as an `Asynchronous System Trap'.
* This is left-over Vax emulation crap that should be fixed.
*
* Traps not supported on the spitfire are marked with `*',
* and additions are marked with `+'
*/
static const char T[] = "*trap";
const char *trap_type[] = {
/* non-user vectors */
"ast", /* 0 */
"power on reset", /* 1 */
"watchdog reset", /* 2 */
"externally initiated reset",/*3 */
"software initiated reset",/* 4 */
"RED state exception", /* 5 */
T, T, /* 6..7 */
"instruction access exception", /* 8 */
"*instruction MMU miss",/* 9 */
"instruction access error",/* 0a */
T, T, T, T, T, /* 0b..0f */
"illegal instruction", /* 10 */
"privileged opcode", /* 11 */
"*unimplemented LDD", /* 12 */
"*unimplemented STD", /* 13 */
T, T, T, T, /* 14..17 */
T, T, T, T, T, T, T, T, /* 18..1f */
"fp disabled", /* 20 */
"fp exception ieee 754",/* 21 */
"fp exception other", /* 22 */
"tag overflow", /* 23 */
"clean window", /* 24 */
T, T, T, /* 25..27 -- trap continues */
"division by zero", /* 28 */
"*internal processor error",/* 29 */
T, T, T, T, T, T, /* 2a..2f */
"data access exception",/* 30 */
"*data access MMU miss",/* 31 */
"data access error", /* 32 */
"*data access protection",/* 33 */
"mem address not aligned", /* 34 */
"LDDF mem address not aligned",/* 35 */
"STDF mem address not aligned",/* 36 */
"privileged action", /* 37 */
"LDQF mem address not aligned",/* 38 */
"STQF mem address not aligned",/* 39 */
T, T, T, T, T, T, /* 3a..3f */
"*async data error", /* 40 */
"level 1 int", /* 41 */
"level 2 int", /* 42 */
"level 3 int", /* 43 */
"level 4 int", /* 44 */
"level 5 int", /* 45 */
"level 6 int", /* 46 */
"level 7 int", /* 47 */
"level 8 int", /* 48 */
"level 9 int", /* 49 */
"level 10 int", /* 4a */
"level 11 int", /* 4b */
"level 12 int", /* 4c */
"level 13 int", /* 4d */
"level 14 int", /* 4e */
"level 15 int", /* 4f */
T, T, T, T, T, T, T, T, /* 50..57 */
T, T, T, T, T, T, T, T, /* 58..5f */
"+interrupt vector", /* 60 */
"+PA_watchpoint", /* 61 */
"+VA_watchpoint", /* 62 */
"+corrected ECC error", /* 63 */
"+fast instruction access MMU miss",/* 64 */
T, T, T, /* 65..67 -- trap continues */
"+fast data access MMU miss",/* 68 */
T, T, T, /* 69..6b -- trap continues */
"+fast data access protection",/* 6c */
T, T, T, /* 6d..6f -- trap continues */
T, T, T, T, T, T, T, T, /* 70..77 */
T, T, T, T, T, T, T, T, /* 78..7f */
"spill 0 normal", /* 80 */
T, T, T, /* 81..83 -- trap continues */
"spill 1 normal", /* 84 */
T, T, T, /* 85..87 -- trap continues */
"spill 2 normal", /* 88 */
T, T, T, /* 89..8b -- trap continues */
"spill 3 normal", /* 8c */
T, T, T, /* 8d..8f -- trap continues */
"spill 4 normal", /* 90 */
T, T, T, /* 91..93 -- trap continues */
"spill 5 normal", /* 94 */
T, T, T, /* 95..97 -- trap continues */
"spill 6 normal", /* 98 */
T, T, T, /* 99..9b -- trap continues */
"spill 7 normal", /* 9c */
T, T, T, /* 9c..9f -- trap continues */
"spill 0 other", /* a0 */
T, T, T, /* a1..a3 -- trap continues */
"spill 1 other", /* a4 */
T, T, T, /* a5..a7 -- trap continues */
"spill 2 other", /* a8 */
T, T, T, /* a9..ab -- trap continues */
"spill 3 other", /* ac */
T, T, T, /* ad..af -- trap continues */
"spill 4 other", /* b0 */
T, T, T, /* b1..b3 -- trap continues */
"spill 5 other", /* b4 */
T, T, T, /* b5..b7 -- trap continues */
"spill 6 other", /* b8 */
T, T, T, /* b9..bb -- trap continues */
"spill 7 other", /* bc */
T, T, T, /* bc..bf -- trap continues */
"fill 0 normal", /* c0 */
T, T, T, /* c1..c3 -- trap continues */
"fill 1 normal", /* c4 */
T, T, T, /* c5..c7 -- trap continues */
"fill 2 normal", /* c8 */
T, T, T, /* c9..cb -- trap continues */
"fill 3 normal", /* cc */
T, T, T, /* cd..cf -- trap continues */
"fill 4 normal", /* d0 */
T, T, T, /* d1..d3 -- trap continues */
"fill 5 normal", /* d4 */
T, T, T, /* d5..d7 -- trap continues */
"fill 6 normal", /* d8 */
T, T, T, /* d9..db -- trap continues */
"fill 7 normal", /* dc */
T, T, T, /* dc..df -- trap continues */
"fill 0 other", /* e0 */
T, T, T, /* e1..e3 -- trap continues */
"fill 1 other", /* e4 */
T, T, T, /* e5..e7 -- trap continues */
"fill 2 other", /* e8 */
T, T, T, /* e9..eb -- trap continues */
"fill 3 other", /* ec */
T, T, T, /* ed..ef -- trap continues */
"fill 4 other", /* f0 */
T, T, T, /* f1..f3 -- trap continues */
"fill 5 other", /* f4 */
T, T, T, /* f5..f7 -- trap continues */
"fill 6 other", /* f8 */
T, T, T, /* f9..fb -- trap continues */
"fill 7 other", /* fc */
T, T, T, /* fc..ff -- trap continues */
/* user (software trap) vectors */
"syscall", /* 100 */
"breakpoint", /* 101 */
"zero divide", /* 102 */
"flush windows", /* 103 */
"clean windows", /* 104 */
"range check", /* 105 */
"fix align", /* 106 */
"integer overflow", /* 107 */
"svr4 syscall", /* 108 */
"4.4 syscall", /* 109 */
"kgdb exec", /* 10a */
T, T, T, T, T, /* 10b..10f */
T, T, T, T, T, T, T, T, /* 11a..117 */
T, T, T, T, T, T, T, T, /* 118..11f */
"svr4 getcc", /* 120 */
"svr4 setcc", /* 121 */
"svr4 getpsr", /* 122 */
"svr4 setpsr", /* 123 */
"svr4 gethrtime", /* 124 */
"svr4 gethrvtime", /* 125 */
T, /* 126 */
"svr4 gethrestime", /* 127 */
T, T, T, T, T, T, T, T, /* 128..12f */
T, T, /* 130..131 */
"get condition codes", /* 132 */
"set condision codes", /* 133 */
T, T, T, T, /* 134..137 */
T, T, T, T, T, T, T, T, /* 138..13f */
T, T, T, T, T, T, T, T, /* 140..147 */
T, T, T, T, T, T, T, T, /* 148..14f */
T, T, T, T, T, T, T, T, /* 150..157 */
T, T, T, T, T, T, T, T, /* 158..15f */
T, T, T, T, /* 160..163 */
"SVID syscall64", /* 164 */
"SPARC Intl syscall64", /* 165 */
"OS vedor spec syscall",/* 166 */
"HW OEM syscall", /* 167 */
"ret from deferred trap", /* 168 */
};
#define N_TRAP_TYPES (sizeof trap_type / sizeof *trap_type)
static __inline void userret __P((struct proc *, int, u_quad_t));
void trap __P((unsigned, long, long, struct trapframe64 *));
static __inline void share_fpu __P((struct proc *, struct trapframe64 *));
void mem_access_fault __P((unsigned, int, u_long, int, int, struct trapframe64 *));
void data_access_fault __P((unsigned type, u_long va, u_long pc, struct trapframe64 *));
void data_access_error __P((unsigned, u_long, u_long, u_long, u_long, struct trapframe64 *));
void text_access_fault __P((unsigned, u_long, struct trapframe64 *));
void text_access_error __P((unsigned, u_long, u_long, u_long, u_long, struct trapframe64 *));
void syscall __P((register_t, struct trapframe64 *, register_t));
#ifdef DEBUG
void print_trapframe __P((struct trapframe64 *));
void
print_trapframe(tf)
struct trapframe64 *tf;
{
printf("Trapframe %p:\ttstate: %lx\tpc: %lx\tnpc: %lx\n",
tf, (u_long)tf->tf_tstate, (u_long)tf->tf_pc, (u_long)tf->tf_npc);
printf("fault: %p\tkstack: %p\ty: %x\t",
(void *)(u_long)tf->tf_fault, (void *)(u_long)tf->tf_kstack,
(int)tf->tf_y);
printf("pil: %d\toldpil: %d\ttt: %x\tGlobals:\n",
(int)tf->tf_pil, (int)tf->tf_oldpil, (int)tf->tf_tt);
printf("%08x%08x %08x%08x %08x%08x %08x%08x\n",
(u_int)(tf->tf_global[0]>>32), (u_int)tf->tf_global[0],
(u_int)(tf->tf_global[1]>>32), (u_int)tf->tf_global[1],
(u_int)(tf->tf_global[2]>>32), (u_int)tf->tf_global[2],
(u_int)(tf->tf_global[3]>>32), (u_int)tf->tf_global[3]);
printf("%08x%08x %08x%08x %08x%08x %08x%08x\nouts:\n",
(u_int)(tf->tf_global[4]>>32), (u_int)tf->tf_global[4],
(u_int)(tf->tf_global[5]>>32), (u_int)tf->tf_global[5],
(u_int)(tf->tf_global[6]>>32), (u_int)tf->tf_global[6],
(u_int)(tf->tf_global[7]>>32), (u_int)tf->tf_global[7]);
printf("%08x%08x %08x%08x %08x%08x %08x%08x\n",
(u_int)(tf->tf_out[0]>>32), (u_int)tf->tf_out[0],
(u_int)(tf->tf_out[1]>>32), (u_int)tf->tf_out[1],
(u_int)(tf->tf_out[2]>>32), (u_int)tf->tf_out[2],
(u_int)(tf->tf_out[3]>>32), (u_int)tf->tf_out[3]);
printf("%08x%08x %08x%08x %08x%08x %08x%08x\n",
(u_int)(tf->tf_out[4]>>32), (u_int)tf->tf_out[4],
(u_int)(tf->tf_out[5]>>32), (u_int)tf->tf_out[5],
(u_int)(tf->tf_out[6]>>32), (u_int)tf->tf_out[6],
(u_int)(tf->tf_out[7]>>32), (u_int)tf->tf_out[7]);
}
#endif
/*
* Define the code needed before returning to user mode, for
* trap, mem_access_fault, and syscall.
*/
static __inline void
userret(p, pc, oticks)
struct proc *p;
int pc;
u_quad_t oticks;
{
int sig;
/* take pending signals */
while ((sig = CURSIG(p)) != 0)
postsig(sig);
p->p_priority = p->p_usrpri;
if (want_ast) {
want_ast = 0;
if (p->p_flag & P_OWEUPC) {
p->p_flag &= ~P_OWEUPC;
ADDUPROF(p);
}
}
if (want_resched) {
/*
* We are being preempted.
*/
preempt(NULL);
while ((sig = CURSIG(p)) != 0)
postsig(sig);
}
/*
* If profiling, charge recent system time to the trapped pc.
*/
if (p->p_flag & P_PROFIL)
addupc_task(p, pc, (int)(p->p_sticks - oticks));
curcpu()->ci_schedstate.spc_curpriority = p->p_priority;
}
/*
* If someone stole the FPU while we were away, do not enable it
* on return. This is not done in userret() above as it must follow
* the ktrsysret() in syscall(). Actually, it is likely that the
* ktrsysret should occur before the call to userret.
*
* Oh, and don't touch the FPU bit if we're returning to the kernel.
*/
static __inline void share_fpu(p, tf)
struct proc *p;
struct trapframe64 *tf;
{
if (!(tf->tf_tstate & (PSTATE_PRIV<<TSTATE_PSTATE_SHIFT)) &&
(tf->tf_tstate & (PSTATE_PEF<<TSTATE_PSTATE_SHIFT)) && fpproc != p)
tf->tf_tstate &= ~(PSTATE_PEF<<TSTATE_PSTATE_SHIFT);
}
/*
* Called from locore.s trap handling, for non-MMU-related traps.
* (MMU-related traps go through mem_access_fault, below.)
*/
void
trap(type, tstate, pc, tf)
register unsigned type;
register long tstate, pc;
register struct trapframe64 *tf;
{
register struct proc *p;
register struct pcb *pcb;
register int pstate = (tstate>>TSTATE_PSTATE_SHIFT);
register int64_t n;
u_quad_t sticks;
/* This steps the PC over the trap. */
#define ADVANCE (n = tf->tf_npc, tf->tf_pc = n, tf->tf_npc = n + 4)
#ifdef DEBUG
if (tf->tf_pc == tf->tf_npc) {
printf("trap: tpc %p == tnpc %p\n",
(void *)(u_long)tf->tf_pc, (void *)(u_long)tf->tf_npc);
Debugger();
}
#if 0
{
/* Check to make sure we're on the normal stack */
int* sp;
__asm("mov %%sp, %0" : "=r" (sp) :);
if (sp < EINTSTACK) {
printf("trap: We're on the interrupt stack!\ntype=0x%x tf=%p %s\n",
type, tf, type < N_TRAP_TYPES ? trap_type[type] :
((type == T_AST) ? "ast" :
((type == T_RWRET) ? "rwret" : T)));
}
}
#endif
#endif
#ifdef DEBUG
if ((trapdebug&TDB_NSAVED && cpcb->pcb_nsaved) || trapdebug&(TDB_FOLLOW|TDB_TRAP)) {
char sbuf[sizeof(PSTATE_BITS) + 64];
printf("trap: type 0x%x: pc=%lx &tf=%p\n",
type, pc, tf);
bitmask_snprintf(pstate, PSTATE_BITS, sbuf, sizeof(sbuf));
printf(" npc=%lx pstate=%s %s\n",
(long)tf->tf_npc, sbuf,
type < N_TRAP_TYPES ? trap_type[type] :
((type == T_AST) ? "ast" :
((type == T_RWRET) ? "rwret" : T)));
}
#if 0
if (trapdebug & TDB_FRAME) {
print_trapframe(tf);
}
#endif
#endif
uvmexp.traps++;
#ifdef DEBUG
if ((trapdebug&(TDB_FOLLOW|TDB_TRAP)) || ((trapdebug & TDB_TL) && tl())) {
char sbuf[sizeof(PSTATE_BITS) + 64];
extern int trap_trace_dis;
trap_trace_dis = 1;
printf("trap: type 0x%x: lvl=%d pc=%lx &tf=%p",
type, (int)tl(), pc, tf);
bitmask_snprintf(pstate, PSTATE_BITS, sbuf, sizeof(sbuf));
printf(" npc=%lx pstate=%s %s\n",
(long)tf->tf_npc, sbuf,
type < N_TRAP_TYPES ? trap_type[type] :
((type == T_AST) ? "ast" :
((type == T_RWRET) ? "rwret" : T)));
#ifdef DDB
kdb_trap(type, tf);
#endif
}
#endif
/*
* Generally, kernel traps cause a panic. Any exceptions are
* handled early here.
*/
if (pstate & PSTATE_PRIV) {
#ifdef DDB
if (type == T_BREAKPOINT) {
write_all_windows();
if (kdb_trap(type, tf)) {
/* ADVANCE; */
return;
}
}
if (type == T_PA_WATCHPT || type == T_VA_WATCHPT) {
if (kdb_trap(type, tf)) {
/* DDB must turn off watchpoints or something */
return;
}
}
#endif
/*
* The kernel needs to use FPU registers for block
* load/store. If we trap in priviliged code, save
* the FPU state if there is any and enable the FPU.
*
* We rely on the kernel code properly enabling the FPU
* in %fprs, otherwise we'll hang here trying to enable
* the FPU.
*/
if (type == T_FPDISABLED) {
#ifndef NEW_FPSTATE
if (fpproc != NULL) { /* someone else had it */
savefpstate(fpproc->p_md.md_fpstate);
fpproc = NULL;
/* Enable the FPU */
/* loadfpstate(initfpstate);*/
}
tf->tf_tstate |= (PSTATE_PEF<<TSTATE_PSTATE_SHIFT);
return;
#else
/* New scheme */
if (fpproc != NULL) { /* someone else had it, maybe? */
savefpstate(fpproc->p_md.md_fpstate);
fpproc = NULL;
/* Enable the FPU */
}
if (CLKF_INTR((struct clockframe *)tf) || !curproc) {
fpproc = &proc0;
} else {
fpproc = curproc;
}
/* If we have an allocated fpstate then load it */
if (fpproc->p_md.md_fpstate != 0)
loadfpstate(fpproc->p_md.md_fpstate);
else
fpproc = NULL;
tf->tf_tstate |= (PSTATE_PEF<<TSTATE_PSTATE_SHIFT);
return;
#endif
}
goto dopanic;
}
if ((p = curproc) == NULL)
p = &proc0;
sticks = p->p_sticks;
pcb = &p->p_addr->u_pcb;
p->p_md.md_tf = tf; /* for ptrace/signals */
switch (type) {
default:
if (type < 0x100) {
extern int trap_trace_dis;
dopanic:
trap_trace_dis = 1;
{
char sbuf[sizeof(PSTATE_BITS) + 64];
printf("trap type 0x%x: pc=%lx",
type, pc);
bitmask_snprintf(pstate, PSTATE_BITS, sbuf,
sizeof(sbuf));
printf(" npc=%lx pstate=%s\n",
(long)tf->tf_npc, sbuf);
DEBUGGER(type, tf);
panic(type < N_TRAP_TYPES ? trap_type[type] : T);
}
/* NOTREACHED */
}
#if defined(COMPAT_SVR4) || defined(COMPAT_SVR4_32)
badtrap:
#endif
/* the following message is gratuitous */
/* ... but leave it in until we find anything */
printf("%s[%d]: unimplemented software trap 0x%x\n",
p->p_comm, p->p_pid, type);
trapsignal(p, SIGILL, type);
break;
#if defined(COMPAT_SVR4) || defined(COMPAT_SVR4_32)
case T_SVR4_GETCC:
case T_SVR4_SETCC:
case T_SVR4_GETPSR:
case T_SVR4_SETPSR:
case T_SVR4_GETHRTIME:
case T_SVR4_GETHRVTIME:
case T_SVR4_GETHRESTIME:
#if defined(COMPAT_SVR4_32)
if (svr4_32_trap(type, p))
break;
#endif
#if defined(COMPAT_SVR4)
if (svr4_trap(type, p))
break;
#endif
goto badtrap;
#endif
case T_AST:
break; /* the work is all in userret() */
case T_ILLINST:
case T_INST_EXCEPT:
case T_TEXTFAULT:
/* This is not an MMU issue!!!! */
printf("trap: textfault at %lx!! sending SIGILL due to trap %d: %s\n",
pc, type, type < N_TRAP_TYPES ? trap_type[type] : T);
#if defined(DDB) && defined(DEBUG)
if (trapdebug & TDB_STOPSIG)
Debugger();
#endif
trapsignal(p, SIGILL, 0); /* XXX code?? */
break;
case T_PRIVINST:
printf("trap: privinst!! sending SIGILL due to trap %d: %s\n",
type, type < N_TRAP_TYPES ? trap_type[type] : T);
#if defined(DDB) && defined(DEBUG)
if (trapdebug & TDB_STOPSIG)
Debugger();
#endif
trapsignal(p, SIGILL, 0); /* XXX code?? */
break;
case T_FPDISABLED: {
register struct fpstate64 *fs = p->p_md.md_fpstate;
if (fs == NULL) {
/* NOTE: fpstate must be 64-bit aligned */
fs = malloc((sizeof *fs), M_SUBPROC, M_WAITOK);
*fs = initfpstate;
fs->fs_qsize = 0;
p->p_md.md_fpstate = fs;
}
/*
* If we have not found an FPU, we have to emulate it.
*
* Since All UltraSPARC CPUs have an FPU how can this happen?
*/
if (!foundfpu) {
#ifdef notyet
fpu_emulate(p, tf, fs);
break;
#else
trapsignal(p, SIGFPE, 0); /* XXX code?? */
break;
#endif
}
/*
* We may have more FPEs stored up and/or ops queued.
* If they exist, handle them and get out. Otherwise,
* resolve the FPU state, turn it on, and try again.
*
* Ultras should never have a FPU queue.
*/
if (fs->fs_qsize) {
printf("trap: Warning fs_qsize is %d\n",fs->fs_qsize);
fpu_cleanup(p, fs);
break;
}
if (fpproc != p) { /* we do not have it */
if (fpproc != NULL) /* someone else had it */
savefpstate(fpproc->p_md.md_fpstate);
loadfpstate(fs);
fpproc = p; /* now we do have it */
}
tf->tf_tstate |= (PSTATE_PEF<<TSTATE_PSTATE_SHIFT);
break;
}
case T_ALIGN:
case T_LDDF_ALIGN:
case T_STDF_ALIGN:
{
int64_t dsfsr, dsfar=0, isfsr;
dsfsr = ldxa(SFSR, ASI_DMMU);
if (dsfsr & SFSR_FV)
dsfar = ldxa(SFAR, ASI_DMMU);
isfsr = ldxa(SFSR, ASI_IMMU);
/*
* If we're busy doing copyin/copyout continue
*/
if (p->p_addr && p->p_addr->u_pcb.pcb_onfault) {
tf->tf_pc = (vaddr_t)p->p_addr->u_pcb.pcb_onfault;
tf->tf_npc = tf->tf_pc + 4;
break;
}
#define fmt64(x) (int)((x)>>32), (int)((x))
printf("Alignment error: dsfsr=%08x:%08x dsfar=%x:%x isfsr=%08x:%08x pc=%lx\n",
fmt64(dsfsr), fmt64(dsfar), fmt64(isfsr), pc);
}
#if defined(DDB) && defined(DEBUG)
if (trapdebug & TDB_STOPSIG) {
write_all_windows();
kdb_trap(type, tf);
}
#endif
if ((p->p_md.md_flags & MDP_FIXALIGN) != 0 &&
fixalign(p, tf) == 0) {
ADVANCE;
break;
}
trapsignal(p, SIGBUS, 0); /* XXX code?? */
break;
case T_FP_IEEE_754:
case T_FP_OTHER:
/*
* Clean up after a floating point exception.
* fpu_cleanup can (and usually does) modify the
* state we save here, so we must `give up' the FPU
* chip context. (The software and hardware states
* will not match once fpu_cleanup does its job, so
* we must not save again later.)
*/
if (p != fpproc)
panic("fpe without being the FP user");
savefpstate(p->p_md.md_fpstate);
fpproc = NULL;
/* tf->tf_psr &= ~PSR_EF; */ /* share_fpu will do this */
if (p->p_md.md_fpstate->fs_qsize == 0) {
copyin((caddr_t)pc, &p->p_md.md_fpstate->fs_queue[0].fq_instr, sizeof(int));
p->p_md.md_fpstate->fs_qsize = 1;
fpu_cleanup(p, p->p_md.md_fpstate);
ADVANCE;
} else
fpu_cleanup(p, p->p_md.md_fpstate);
/* fpu_cleanup posts signals if needed */
#if 0 /* ??? really never??? */
ADVANCE;
#endif
break;
case T_TAGOF:
trapsignal(p, SIGEMT, 0); /* XXX code?? */
break;
case T_BREAKPOINT:
trapsignal(p, SIGTRAP, 0);
break;
case T_DIV0:
ADVANCE;
trapsignal(p, SIGFPE, FPE_INTDIV_TRAP);
break;
case T_CLEANWIN:
uprintf("T_CLEANWIN\n"); /* XXX Should not get this */
ADVANCE;
break;
case T_FLUSHWIN:
/* Software window flush for v8 software */
write_all_windows();
ADVANCE;
break;
case T_RANGECHECK:
printf("T_RANGECHECK\n"); /* XXX */
ADVANCE;
trapsignal(p, SIGILL, 0); /* XXX code?? */
break;
case T_FIXALIGN:
#ifdef DEBUG_ALIGN
uprintf("T_FIXALIGN\n");
#endif
/* User wants us to fix alignment faults */
p->p_md.md_flags |= MDP_FIXALIGN;
ADVANCE;
break;
case T_INTOF:
uprintf("T_INTOF\n"); /* XXX */
ADVANCE;
trapsignal(p, SIGFPE, FPE_INTOVF_TRAP);
break;
}
userret(p, pc, sticks);
share_fpu(p, tf);
#undef ADVANCE
#ifdef DEBUG
if (trapdebug&(TDB_FOLLOW|TDB_TRAP)) {
printf("trap: done\n");
/* if (type != T_BREAKPOINT) Debugger(); */
}
#if 0
if (trapdebug & TDB_FRAME) {
print_trapframe(tf);
}
#endif
#endif
}
/*
* Save windows from PCB into user stack, and return 0. This is used on
* window overflow pseudo-traps (from locore.s, just before returning to
* user mode) and when ptrace or sendsig needs a consistent state.
* As a side effect, rwindow_save() always sets pcb_nsaved to 0.
*
* If the windows cannot be saved, pcb_nsaved is restored and we return -1.
*
* XXXXXX This cannot work properly. I need to re-examine this register
* window thing entirely.
*/
int
rwindow_save(p)
register struct proc *p;
{
register struct pcb *pcb = &p->p_addr->u_pcb;
register struct rwindow64 *rw = &pcb->pcb_rw[0];
register u_int64_t rwdest;
register int i, j;
i = pcb->pcb_nsaved;
#ifdef DEBUG
if (rwindow_debug&RW_FOLLOW)
printf("rwindow_save(%p): nsaved %d\n", p, i);
#endif
if (i == 0)
return (0);
#ifdef DEBUG
if (rwindow_debug&RW_FOLLOW)
printf("%s[%d]: rwindow: pcb->stack:", p->p_comm, p->p_pid);
#endif
while (i > 0) {
rwdest = rw[i--].rw_in[6];
#ifdef DEBUG
if (rwindow_debug&RW_FOLLOW)
printf("window %d at %lx\n", i, (long)rwdest);
#endif
if (rwdest & 1) {
#ifdef DEBUG
if (rwindow_debug&RW_64) {
printf("rwindow_save: 64-bit tf to %p+BIAS or %p\n",
(void *)(long)rwdest, (void *)(long)(rwdest+BIAS));
Debugger();
}
#endif
rwdest += BIAS;
if (copyout((caddr_t)&rw[i], (caddr_t)(u_long)rwdest,
sizeof(*rw))) {
#ifdef DEBUG
if (rwindow_debug&(RW_ERR|RW_64))
printf("rwindow_save: 64-bit pcb copyout to %p failed\n",
(void *)(long)rwdest);
#endif
return (-1);
}
#ifdef DEBUG
if (rwindow_debug&RW_64) {
printf("Finished copyout(%p, %p, %lx)\n",
(caddr_t)&rw[i], (caddr_t)(long)rwdest,
sizeof(*rw));
Debugger();
}
#endif
} else {
struct rwindow32 rwstack;
/* 32-bit window */
for (j = 0; j < 8; j++) {
rwstack.rw_local[j] = (int)rw[i].rw_local[j];
rwstack.rw_in[j] = (int)rw[i].rw_in[j];
}
/* Must truncate rwdest */
if (copyout(&rwstack, (caddr_t)(u_long)(u_int)rwdest, sizeof(rwstack))) {
#ifdef DEBUG
if (rwindow_debug&RW_ERR)
printf("rwindow_save: 32-bit pcb copyout to %p (%p) failed\n",
(void *)(u_long)(u_int)rwdest, (void *)(u_long)rwdest);
#endif
return (-1);
}
}
}
pcb->pcb_nsaved = 0;
#ifdef DEBUG
if (rwindow_debug&RW_FOLLOW) {
printf("\n");
Debugger();
}
#endif
return (0);
}
/*
* Kill user windows (before exec) by writing back to stack or pcb
* and then erasing any pcb tracks. Otherwise we might try to write
* the registers into the new process after the exec.
*/
void
kill_user_windows(p)
struct proc *p;
{
write_user_windows();
p->p_addr->u_pcb.pcb_nsaved = 0;
}
void
data_access_fault(type, addr, pc, tf)
unsigned type;
u_long addr;
u_long pc;
struct trapframe64 *tf;
{
register u_int64_t tstate;
register struct proc *p;
register struct vmspace *vm;
register vaddr_t va;
register int rv;
vm_prot_t access_type;
vaddr_t onfault;
u_quad_t sticks;
#ifdef DEBUG
static int lastdouble;
extern struct pcb* cpcb;
#endif
#ifdef DEBUG
if (tf->tf_pc == tf->tf_npc) {
printf("data_access_fault: tpc %lx == tnpc %lx\n",
(long)tf->tf_pc, (long)tf->tf_npc);
Debugger();
}
if (protmmu || missmmu) {
extern int trap_trace_dis;
trap_trace_dis = 1;
printf("%ld: data_access_fault(%x, %lx, %lx, %p) %s=%d\n",
(long)(curproc?curproc->p_pid:-1), type, addr, pc, tf,
(protmmu)?"protmmu":"missmmu", (protmmu)?protmmu:missmmu);
Debugger();
}
write_user_windows();
if ((cpcb->pcb_nsaved > 8) ||
(trapdebug&TDB_NSAVED && cpcb->pcb_nsaved) ||
(trapdebug&(TDB_ADDFLT|TDB_FOLLOW))) {
printf("%ld: data_access_fault(%lx, %p, %p, %p) nsaved=%d\n",
(long)(curproc?curproc->p_pid:-1), (long)type, (void*)addr,
(void*)pc, (void*)tf, (int)cpcb->pcb_nsaved);
if ((trapdebug&TDB_NSAVED && cpcb->pcb_nsaved)) Debugger();
}
if (trapdebug & TDB_FRAME) {
print_trapframe(tf);
}
if ((trapdebug & TDB_TL) && tl()) {
printf("%d: tl %d data_access_fault(%x, %p, %p, %p) nsaved=%d\n",
(int)(curproc?curproc->p_pid:-1), (int)tl(), (int)type,
(void*)addr, (void*)pc, (void*)tf, (int)cpcb->pcb_nsaved);
Debugger();
}
if (trapdebug&TDB_STOPCALL) {
Debugger();
}
#endif
uvmexp.traps++;
if ((p = curproc) == NULL) /* safety check */
p = &proc0;
sticks = p->p_sticks;
#if 0
/* This can happen when we're in DDB w/curproc == NULL and try
* to access user space.
*/
#ifdef DIAGNOSTIC
if ((addr & PAGE_MASK) &&
(addr & PAGE_MASK) != p->p_vmspace->vm_map.pmap->pm_ctx) {
printf("data_access_fault: va ctx %x != pm ctx %x\n",
(addr & PAGE_MASK), p->p_vmspace->vm_map.pmap->pm_ctx);
Debugger();
}
#endif
#endif
tstate = tf->tf_tstate;
/* Find the faulting va to give to uvm_fault */
va = trunc_page(addr);
#ifdef DEBUG
if (lastdouble) {
printf("stacked data fault @ %lx (pc %lx);", addr, pc);
lastdouble = 0;
if (curproc == NULL)
printf("NULL proc\n");
else
printf("pid %d(%s); sigmask %x, sigcatch %x\n",
curproc->p_pid, curproc->p_comm,
/* XXX */
curproc->p_sigctx.ps_sigmask.__bits[0],
curproc->p_sigctx.ps_sigcatch.__bits[0]);
}
#endif
/* Now munch on protections... */
access_type = (type == T_FDMMU_PROT) ? VM_PROT_READ|VM_PROT_WRITE : VM_PROT_READ;
if (tstate & (PSTATE_PRIV<<TSTATE_PSTATE_SHIFT)) {
extern char Lfsbail[];
/*
* If this was an access that we shouldn't try to page in,
* resume at the fault handler without any action.
*/
if (p->p_addr && p->p_addr->u_pcb.pcb_onfault == Lfsbail)
goto kfault;
/*
* During autoconfiguration, faults are never OK unless
* pcb_onfault is set. Once running normally we must allow
* exec() to cause copy-on-write faults to kernel addresses.
*/
if (cold)
goto kfault;
if (!(addr&TLB_TAG_ACCESS_CTX)) {
/* CTXT == NUCLEUS */
if ((rv=uvm_fault(kernel_map, va, 0, access_type)) == KERN_SUCCESS) {
#ifdef DEBUG
if (trapdebug&(TDB_ADDFLT|TDB_FOLLOW))
printf("data_access_fault: kernel uvm_fault(%p, %lx, %x, 0) sez %x -- success\n",
kernel_map, (vaddr_t)va, 0, rv);
#endif
return;
}
#ifdef DEBUG
if (trapdebug&(TDB_ADDFLT|TDB_FOLLOW))
printf("data_access_fault: kernel uvm_fault(%p, %lx, 0, 0) sez %x -- failure\n",
(void *)(u_long)kernel_map, (vaddr_t)va, rv);
#endif
goto kfault;
}
} else
p->p_md.md_tf = tf;
vm = p->p_vmspace;
/* alas! must call the horrible vm code */
rv = uvm_fault(&vm->vm_map, (vaddr_t)va, 0, access_type);
#ifdef DEBUG
if (trapdebug&(TDB_ADDFLT|TDB_FOLLOW))
printf("data_access_fault: user uvm_fault(%p, %lx, %x, FALSE) sez %x\n",
&vm->vm_map, (vaddr_t)va, 0, rv);
#endif
/*
* If this was a stack access we keep track of the maximum
* accessed stack size. Also, if uvm_fault gets a protection
* failure it is due to accessing the stack region outside
* the current limit and we need to reflect that as an access
* error.
*/
if ((caddr_t)va >= vm->vm_maxsaddr) {
if (rv == KERN_SUCCESS) {
segsz_t nss = btoc(p->p_vmspace->vm_minsaddr - va);
if (nss > vm->vm_ssize)
vm->vm_ssize = nss;
} else if (rv == KERN_PROTECTION_FAILURE)
rv = KERN_INVALID_ADDRESS;
}
if (rv != KERN_SUCCESS) {
/*
* Pagein failed. If doing copyin/out, return to onfault
* address. Any other page fault in kernel, die; if user
* fault, deliver SIGSEGV.
*/
if (tstate & (PSTATE_PRIV<<TSTATE_PSTATE_SHIFT)) {
kfault:
onfault = p->p_addr ?
(long)p->p_addr->u_pcb.pcb_onfault : 0;
if (!onfault) {
extern int trap_trace_dis;
trap_trace_dis = 1; /* Disable traptrace for printf */
(void) splhigh();
printf("data fault: pc=%lx addr=%lx\n",
pc, addr);
DEBUGGER(type, tf);
panic("kernel fault");
/* NOTREACHED */
}
#ifdef DEBUG
if (trapdebug&(TDB_ADDFLT|TDB_FOLLOW|TDB_STOPCPIO)) {
printf("data_access_fault: copyin/out of %p fault -- recover\n", (void *)addr);
DEBUGGER(type, tf);
}
#endif
tf->tf_pc = onfault;
tf->tf_npc = onfault + 4;
return;
}
#ifdef DEBUG
if (trapdebug&(TDB_ADDFLT|TDB_STOPSIG)) {
extern int trap_trace_dis;
trap_trace_dis = 1;
printf("data_access_fault at addr %p: sending SIGSEGV\n", (void *)addr);
Debugger();
}
#endif
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, (u_long)addr);
} else {
trapsignal(p, SIGSEGV, (u_long)addr);
}
}
if ((tstate & TSTATE_PRIV) == 0) {
userret(p, pc, sticks);
share_fpu(p, tf);
}
#ifdef DEBUG
if (trapdebug&(TDB_ADDFLT|TDB_FOLLOW))
printf("data_access_fault: done\n");
if (trapdebug & TDB_FRAME) {
print_trapframe(tf);
}
if (trapdebug&(TDB_ADDFLT|TDB_FOLLOW)) {
extern void* return_from_trap __P((void));
if ((void *)(u_long)tf->tf_pc == (void *)return_from_trap) {
printf("Returning from stack datafault\n");
}
}
#endif
}
void
data_access_error(type, sfva, sfsr, afva, afsr, tf)
register unsigned type;
register u_long sfva;
register u_long sfsr;
register u_long afva;
register u_long afsr;
register struct trapframe64 *tf;
{
register u_long pc;
register u_int64_t tstate;
register struct proc *p;
register struct vmspace *vm;
register vaddr_t va = 0; /* Stupid GCC warning */
register int rv;
vm_prot_t access_type;
vaddr_t onfault;
u_quad_t sticks;
#ifdef DEBUG
static int lastdouble;
#endif
#ifdef DEBUG
if (tf->tf_pc == tf->tf_npc) {
printf("data_access_error: tpc %lx == tnpc %lx\n",
(long)tf->tf_pc, (long)tf->tf_npc);
Debugger();
}
if (protmmu || missmmu) {
extern int trap_trace_dis;
trap_trace_dis = 1;
printf("%d: data_access_error(%x, %lx, %lx, %p) %s=%d\n",
curproc?curproc->p_pid:-1, type, sfva, afva, tf,
(protmmu)?"protmmu":"missmmu", (protmmu)?protmmu:missmmu);
Debugger();
}
write_user_windows();
if ((trapdebug&TDB_NSAVED && cpcb->pcb_nsaved) ||
trapdebug&(TDB_ADDFLT|TDB_FOLLOW)) {
char buf[768];
bitmask_snprintf(sfsr, SFSR_BITS, buf, sizeof buf);
printf("%d data_access_error(%lx, %lx, %lx, %p)=%lx @ %p %s\n",
curproc?curproc->p_pid:-1,
(long)type, (long)sfva, (long)afva, tf, (long)tf->tf_tstate,
(void *)(u_long)tf->tf_pc, buf);
}
if (trapdebug & TDB_FRAME) {
print_trapframe(tf);
}
if ((trapdebug & TDB_TL) && tl()) {
char buf[768];
bitmask_snprintf(sfsr, SFSR_BITS, buf, sizeof buf);
printf("%d tl %ld data_access_error(%lx, %lx, %lx, %p)=%lx @ %lx %s\n",
curproc?curproc->p_pid:-1, (long)tl(),
(long)type, (long)sfva, (long)afva, tf, (long)tf->tf_tstate,
(long)tf->tf_pc, buf);
Debugger();
}
if (trapdebug&TDB_STOPCALL) {
Debugger();
}
#endif
uvmexp.traps++;
if ((p = curproc) == NULL) /* safety check */
p = &proc0;
sticks = p->p_sticks;
pc = tf->tf_pc;
tstate = tf->tf_tstate;
/*
* Our first priority is handling serious faults, such as
* parity errors or async faults that might have come through here.
* If we have a data fault, but SFSR_FAV is not set in the sfsr,
* then things are really bizarre, and we treat it as a hard
* error and pass it on to memerr4m.
*/
if ((afsr) != 0 ||
(type == T_DATAFAULT && !(sfsr & SFSR_FV))) {
printf("data memory error type %x sfsr=%lx sfva=%lx afsr=%lx afva=%lx tf=%p\n",
type, sfsr, sfva, afsr, afva, tf);
if (tstate & (PSTATE_PRIV<<TSTATE_PSTATE_SHIFT))
panic("trap: memory error");
/* User fault -- Berr */
trapsignal(p, SIGBUS, (u_long)sfva);
}
/*
* Figure out what to pass the VM code. We cannot ignore the sfva
* register on text faults, since this might be a trap on an
* alternate-ASI access to code space. However, we can't help using
* have a DMMU sfar.
* Kernel faults are somewhat different: text faults are always
* illegal, and data faults are extra complex. User faults must
* set p->p_md.md_tf, in case we decide to deliver a signal. Check
* for illegal virtual addresses early since those can induce more
* faults.
* All translation faults are illegal, and result in a SIGSEGV
* being delivered to the running process (or a kernel panic, for
* a kernel fault). We check the translation first to make sure
* it is not spurious.
* Also, note that in the case where we have an overwritten
* text fault (OW==1, AT==2,3), we attempt to service the
* second (overwriting) fault, then restart the instruction
* (which is from the first fault) and allow the first trap
* to reappear. XXX is this right? It will probably change...
*/
if ((sfsr & SFSR_FV) == 0 || (sfsr & SFSR_FT) == 0) {
printf("data_access_error: no fault\n");
goto out; /* No fault. Why were we called? */
}
/*
* This next section is a mess since some chips use sfva, and others
* don't on text faults. We want to use sfva where possible, since
* we _could_ be dealing with an ASI 0x8,0x9 data access to text space,
* which would trap as a text fault, at least on a HyperSPARC. Ugh.
* XXX: Find out about MicroSPARCs.
*/
if (!(sfsr & SFSR_FV)) {
#ifdef DEBUG
if (trapdebug&(TDB_ADDFLT|TDB_FOLLOW))
printf("data_access_error: got fault without valid SFVA\n");
#endif
goto fault;
}
va = trunc_page(sfva);
#ifdef DEBUG
if (lastdouble) {
printf("stacked data error @ %lx (pc %lx); sfsr %lx", sfva, pc, sfsr);
lastdouble = 0;
if (curproc == NULL)
printf("NULL proc\n");
else
printf("pid %d(%s); sigmask %x, sigcatch %x\n",
curproc->p_pid, curproc->p_comm,
/* XXX */
curproc->p_sigctx.ps_sigmask.__bits[0],
curproc->p_sigctx.ps_sigcatch.__bits[0]);
}
#endif
/* Now munch on protections... */
access_type = (sfsr & SFSR_W) ? VM_PROT_READ|VM_PROT_WRITE : VM_PROT_READ;
if (tstate & (PSTATE_PRIV<<TSTATE_PSTATE_SHIFT)) {
extern char Lfsbail[];
/*
* If this was an access that we shouldn't try to page in,
* resume at the fault handler without any action.
*/
if (p->p_addr && p->p_addr->u_pcb.pcb_onfault == Lfsbail)
goto kfault;
/*
* During autoconfiguration, faults are never OK unless
* pcb_onfault is set. Once running normally we must allow
* exec() to cause copy-on-write faults to kernel addresses.
*/
if (cold)
goto kfault;
if (SFSR_CTXT_IS_PRIM(sfsr) || SFSR_CTXT_IS_NUCLEUS(sfsr)) {
/* NUCLEUS context */
if (uvm_fault(kernel_map, va, 0, access_type) == KERN_SUCCESS)
return;
if (SFSR_CTXT_IS_NUCLEUS(sfsr))
goto kfault;
}
} else
p->p_md.md_tf = tf;
vm = p->p_vmspace;
/* alas! must call the horrible vm code */
#ifdef DEBUG
if (trapdebug&(TDB_ADDFLT|TDB_FOLLOW))
printf("data_access_error: calling uvm_fault\n");
#endif
rv = uvm_fault(&vm->vm_map, (vaddr_t)va, 0, access_type);
/*
* If this was a stack access we keep track of the maximum
* accessed stack size. Also, if uvm_fault gets a protection
* failure it is due to accessing the stack region outside
* the current limit and we need to reflect that as an access
* error.
*/
if ((caddr_t)va >= vm->vm_maxsaddr) {
if (rv == KERN_SUCCESS) {
segsz_t nss = btoc(p->p_vmspace->vm_minsaddr - va);
if (nss > vm->vm_ssize)
vm->vm_ssize = nss;
} else if (rv == KERN_PROTECTION_FAILURE)
rv = KERN_INVALID_ADDRESS;
}
if (rv != KERN_SUCCESS) {
/*
* Pagein failed. If doing copyin/out, return to onfault
* address. Any other page fault in kernel, die; if user
* fault, deliver SIGSEGV.
*/
fault:
if (tstate & (PSTATE_PRIV<<TSTATE_PSTATE_SHIFT)) {
kfault:
onfault = p->p_addr ?
(long)p->p_addr->u_pcb.pcb_onfault : 0;
if (!onfault) {
extern int trap_trace_dis;
char buf[768];
trap_trace_dis = 1; /* Disable traptrace for printf */
bitmask_snprintf(sfsr, SFSR_BITS, buf, sizeof buf);
(void) splhigh();
printf("data fault: pc=%lx addr=%lx sfsr=%s\n",
(u_long)pc, (long)sfva, buf);
DEBUGGER(type, tf);
panic("kernel fault");
/* NOTREACHED */
}
#ifdef DEBUG
if (trapdebug&(TDB_ADDFLT|TDB_FOLLOW|TDB_STOPCPIO)) {
printf("data_access_error: kern fault -- skipping instr\n");
if (trapdebug&TDB_STOPCPIO) DEBUGGER(type, tf);
}
#endif
tf->tf_pc = onfault;
tf->tf_npc = onfault + 4;
return;
}
#ifdef DEBUG
if (trapdebug&(TDB_ADDFLT|TDB_STOPSIG)) {
extern int trap_trace_dis;
trap_trace_dis = 1;
printf("data_access_error at %p: sending SIGSEGV\n",
(void *)(u_long)va);
Debugger();
}
#endif
trapsignal(p, SIGSEGV, (u_long)sfva);
}
out:
if ((tstate & TSTATE_PRIV) == 0) {
userret(p, pc, sticks);
share_fpu(p, tf);
}
#ifdef DEBUG
if (trapdebug&(TDB_ADDFLT|TDB_FOLLOW))
printf("data_access_error: done\n");
if (trapdebug & TDB_FRAME) {
print_trapframe(tf);
}
#endif
}
void
text_access_fault(type, pc, tf)
register unsigned type;
register vaddr_t pc;
register struct trapframe64 *tf;
{
register u_int64_t tstate;
register struct proc *p;
register struct vmspace *vm;
register vaddr_t va;
register int rv;
vm_prot_t access_type;
u_quad_t sticks;
#ifdef DEBUG
if (tf->tf_pc == tf->tf_npc) {
printf("text_access_fault: tpc %p == tnpc %p\n", (void *)(u_long)tf->tf_pc, (void *)(u_long)tf->tf_npc);
Debugger();
}
if (protmmu || missmmu) {
extern int trap_trace_dis;
trap_trace_dis = 1;
printf("%d: text_access_fault(%x, %lx, %p) %s=%d\n",
curproc?curproc->p_pid:-1, type, pc, tf,
(protmmu)?"protmmu":"missmmu", (protmmu)?protmmu:missmmu);
Debugger();
}
write_user_windows();
if (((trapdebug&TDB_NSAVED) && cpcb->pcb_nsaved) ||
(trapdebug&(TDB_TXTFLT|TDB_FOLLOW)))
printf("%d text_access_fault(%x, %lx, %p)\n",
curproc?curproc->p_pid:-1, type, pc, tf);
if (trapdebug & TDB_FRAME) {
print_trapframe(tf);
}
if ((trapdebug & TDB_TL) && tl()) {
printf("%d tl %d text_access_fault(%x, %lx, %p)\n",
curproc?curproc->p_pid:-1, tl(), type, pc, tf);
Debugger();
}
if (trapdebug&TDB_STOPCALL) {
Debugger();
}
#endif
uvmexp.traps++;
if ((p = curproc) == NULL) /* safety check */
p = &proc0;
sticks = p->p_sticks;
tstate = tf->tf_tstate;
va = trunc_page(pc);
/* Now munch on protections... */
access_type = /* VM_PROT_EXECUTE| */VM_PROT_READ;
if (tstate & (PSTATE_PRIV<<TSTATE_PSTATE_SHIFT)) {
extern int trap_trace_dis;
trap_trace_dis = 1; /* Disable traptrace for printf */
(void) splhigh();
printf("text_access_fault: pc=%lx va=%lx\n", pc, va);
DEBUGGER(type, tf);
panic("kernel fault");
/* NOTREACHED */
} else
p->p_md.md_tf = tf;
vm = p->p_vmspace;
/* alas! must call the horrible vm code */
rv = uvm_fault(&vm->vm_map, va, 0, access_type);
#ifdef DEBUG
if (trapdebug&(TDB_TXTFLT|TDB_FOLLOW))
printf("text_access_fault: uvm_fault(%p, %lx, %x, FALSE) sez %x\n",
&vm->vm_map, va, 0, rv);
#endif
/*
* If this was a stack access we keep track of the maximum
* accessed stack size. Also, if uvm_fault gets a protection
* failure it is due to accessing the stack region outside
* the current limit and we need to reflect that as an access
* error.
*/
if ((caddr_t)va >= vm->vm_maxsaddr) {
if (rv == KERN_SUCCESS) {
segsz_t nss = btoc(p->p_vmspace->vm_minsaddr - va);
if (nss > vm->vm_ssize)
vm->vm_ssize = nss;
} else if (rv == KERN_PROTECTION_FAILURE)
rv = KERN_INVALID_ADDRESS;
}
if (rv != KERN_SUCCESS) {
/*
* Pagein failed. Any other page fault in kernel, die; if user
* fault, deliver SIGSEGV.
*/
if (tstate & TSTATE_PRIV) {
extern int trap_trace_dis;
trap_trace_dis = 1; /* Disable traptrace for printf */
(void) splhigh();
printf("text fault: pc=%llx\n", (unsigned long long)pc);
DEBUGGER(type, tf);
panic("kernel fault");
/* NOTREACHED */
}
#ifdef DEBUG
if (trapdebug&(TDB_TXTFLT|TDB_STOPSIG)) {
extern int trap_trace_dis;
trap_trace_dis = 1;
printf("text_access_fault at %p: sending SIGSEGV\n", (void *)(u_long)va);
Debugger();
}
#endif
trapsignal(p, SIGSEGV, (u_long)pc);
}
if ((tstate & TSTATE_PRIV) == 0) {
userret(p, pc, sticks);
share_fpu(p, tf);
}
#ifdef DEBUG
if (trapdebug&(TDB_TXTFLT|TDB_FOLLOW)) {
printf("text_access_fault: done\n");
/* kdb_trap(T_BREAKPOINT, tf); */
}
if (trapdebug & TDB_FRAME) {
print_trapframe(tf);
}
#endif
}
void
text_access_error(type, pc, sfsr, afva, afsr, tf)
register unsigned type;
register u_long pc;
register u_long sfsr;
register u_long afva;
register u_long afsr;
register struct trapframe64 *tf;
{
register int64_t tstate;
register struct proc *p;
register struct vmspace *vm;
register vaddr_t va;
register int rv;
vm_prot_t access_type;
u_quad_t sticks;
#ifdef DEBUG
static int lastdouble;
#endif
char buf[768];
#ifdef DEBUG
if (tf->tf_pc == tf->tf_npc) {
printf("text_access_error: tpc %p == tnpc %p\n",
(void *)(u_long)tf->tf_pc, (void *)(u_long)tf->tf_npc);
Debugger();
}
if (protmmu || missmmu) {
extern int trap_trace_dis;
trap_trace_dis = 1;
printf("%ld: text_access_error(%lx, %lx, %lx, %p) %s=%d\n",
(long)(curproc?curproc->p_pid:-1), (long)type, (long)sfsr, (long)afsr, tf,
(protmmu)?"protmmu":"missmmu", (protmmu)?protmmu:missmmu);
Debugger();
}
write_user_windows();
if ((trapdebug&TDB_NSAVED && cpcb->pcb_nsaved) || trapdebug&(TDB_TXTFLT|TDB_FOLLOW)) {
bitmask_snprintf(sfsr, SFSR_BITS, buf, sizeof buf);
printf("%ld text_access_error(%lx, %lx, %lx, %p)=%lx @ %lx %s\n",
(long)(curproc?curproc->p_pid:-1),
(long)type, pc, (long)afva, tf, (long)tf->tf_tstate,
(long)tf->tf_pc, buf);
}
if (trapdebug & TDB_FRAME) {
print_trapframe(tf);
}
if ((trapdebug & TDB_TL) && tl()) {
bitmask_snprintf(sfsr, SFSR_BITS, buf, sizeof buf);
printf("%ld tl %ld text_access_error(%lx, %lx, %lx, %p)=%lx @ %lx %s\n",
(long)(curproc?curproc->p_pid:-1), (long)tl(),
(long)type, (long)pc, (long)afva, tf,
(long)tf->tf_tstate, (long)tf->tf_pc, buf);
Debugger();
}
if (trapdebug&TDB_STOPCALL) {
Debugger();
}
#endif
uvmexp.traps++;
if ((p = curproc) == NULL) /* safety check */
p = &proc0;
sticks = p->p_sticks;
tstate = tf->tf_tstate;
if ((afsr) != 0) {
extern int trap_trace_dis;
trap_trace_dis++; /* Disable traptrace for printf */
printf("text_access_error: memory error...\n");
printf("text memory error type %d sfsr=%lx sfva=%lx afsr=%lx afva=%lx tf=%p\n",
type, sfsr, pc, afsr, afva, tf);
trap_trace_dis--; /* Reenable traptrace for printf */
if (tstate & (PSTATE_PRIV<<TSTATE_PSTATE_SHIFT))
panic("text_access_error: kernel memory error");
/* User fault -- Berr */
trapsignal(p, SIGBUS, (u_long)pc);
}
if ((sfsr & SFSR_FV) == 0 || (sfsr & SFSR_FT) == 0)
goto out; /* No fault. Why were we called? */
va = trunc_page(pc);
#ifdef DEBUG
if (lastdouble) {
printf("stacked text error @ pc %lx; sfsr %lx", pc, sfsr);
lastdouble = 0;
if (curproc == NULL)
printf("NULL proc\n");
else
printf("pid %d(%s); sigmask %x, sigcatch %x\n",
curproc->p_pid, curproc->p_comm,
/* XXX */
curproc->p_sigctx.ps_sigmask.__bits[0],
curproc->p_sigctx.ps_sigcatch.__bits[0]);
}
#endif
/* Now munch on protections... */
access_type = /* VM_PROT_EXECUTE| */ VM_PROT_READ;
if (tstate & (PSTATE_PRIV<<TSTATE_PSTATE_SHIFT)) {
extern int trap_trace_dis;
trap_trace_dis = 1; /* Disable traptrace for printf */
bitmask_snprintf(sfsr, SFSR_BITS, buf, sizeof buf);
(void) splhigh();
printf("text error: pc=%lx sfsr=%s\n", pc, buf);
DEBUGGER(type, tf);
panic("kernel fault");
/* NOTREACHED */
} else
p->p_md.md_tf = tf;
vm = p->p_vmspace;
/* alas! must call the horrible vm code */
rv = uvm_fault(&vm->vm_map, (vaddr_t)va, 0, access_type);
/*
* If this was a stack access we keep track of the maximum
* accessed stack size. Also, if uvm_fault gets a protection
* failure it is due to accessing the stack region outside
* the current limit and we need to reflect that as an access
* error.
*/
if ((caddr_t)va >= vm->vm_maxsaddr) {
if (rv == KERN_SUCCESS) {
segsz_t nss = btoc(p->p_vmspace->vm_minsaddr - va);
if (nss > vm->vm_ssize)
vm->vm_ssize = nss;
} else if (rv == KERN_PROTECTION_FAILURE)
rv = KERN_INVALID_ADDRESS;
}
if (rv != KERN_SUCCESS) {
/*
* Pagein failed. If doing copyin/out, return to onfault
* address. Any other page fault in kernel, die; if user
* fault, deliver SIGSEGV.
*/
if (tstate & TSTATE_PRIV) {
extern int trap_trace_dis;
trap_trace_dis = 1; /* Disable traptrace for printf */
bitmask_snprintf(sfsr, SFSR_BITS, buf, sizeof buf);
(void) splhigh();
printf("text error: pc=%lx sfsr=%s\n", pc, buf);
DEBUGGER(type, tf);
panic("kernel fault");
/* NOTREACHED */
}
#ifdef DEBUG
if (trapdebug&(TDB_TXTFLT|TDB_STOPSIG)) {
extern int trap_trace_dis;
trap_trace_dis = 1;
printf("text_access_error at %p: sending SIGSEGV\n",
(void *)(u_long)va);
Debugger();
}
#endif
trapsignal(p, SIGSEGV, (u_long)pc);
}
out:
if ((tstate & TSTATE_PRIV) == 0) {
userret(p, pc, sticks);
share_fpu(p, tf);
}
#ifdef DEBUG
if (trapdebug&(TDB_TXTFLT|TDB_FOLLOW))
printf("text_access_error: done\n");
if (trapdebug & TDB_FRAME) {
print_trapframe(tf);
}
#endif
}
/*
* System calls. `pc' is just a copy of tf->tf_pc.
*
* Note that the things labelled `out' registers in the trapframe were the
* `in' registers within the syscall trap code (because of the automatic
* `save' effect of each trap). They are, however, the %o registers of the
* thing that made the system call, and are named that way here.
*
* 32-bit system calls on a 64-bit system are a problem. Each system call
* argument is stored in the smaller of the argument's true size or a
* `register_t'. Now on a 64-bit machine all normal types can be stored in a
* `register_t'. (The only exceptions would be 128-bit `quad's or 128-bit
* extended precision floating point values, which we don't support.) For
* 32-bit syscalls, 64-bit integers like `off_t's, double precision floating
* point values, and several other types cannot fit in a 32-bit `register_t'.
* These will require reading in two `register_t' values for one argument.
*
* In order to calculate the true size of the arguments and therefore whether
* any argument needs to be split into two slots, the system call args
* structure needs to be built with the appropriately sized register_t.
* Otherwise the emul needs to do some magic to split oversized arguments.
*
* We can handle most this stuff for normal syscalls by using either a 32-bit
* or 64-bit array of `register_t' arguments. Unfortunately ktrace always
* expects arguments to be `register_t's, so it loses badly. What's worse,
* ktrace may need to do size translations to massage the argument array
* appropriately according to the emulation that is doing the ktrace.
*
*/
void
syscall(code, tf, pc)
register_t code;
register struct trapframe64 *tf;
register_t pc;
{
int i, nsys, nap;
int64_t *ap;
const struct sysent *callp;
struct proc *p;
int error = 0, new;
union args {
register32_t i[8];
register64_t l[8];
} args;
register_t rval[2];
u_quad_t sticks;
#ifdef DIAGNOSTIC
extern struct pcb *cpcb;
#endif
#ifdef DEBUG
write_user_windows();
if (tf->tf_pc == tf->tf_npc) {
printf("syscall: tpc %p == tnpc %p\n", (void *)(u_long)tf->tf_pc,
(void *)(u_long)tf->tf_npc);
Debugger();
}
if ((trapdebug&TDB_NSAVED && cpcb->pcb_nsaved) || trapdebug&(TDB_SYSCALL|TDB_FOLLOW))
printf("%d syscall(%lx, %p, %lx)\n",
curproc?curproc->p_pid:-1, (u_long)code, tf, (u_long)pc);
if (trapdebug & TDB_FRAME) {
print_trapframe(tf);
}
if ((trapdebug & TDB_TL) && tl()) {
printf("%d tl %d syscall(%lx, %p, %lx)\n",
curproc?curproc->p_pid:-1, tl(), (u_long)code, tf, (u_long)pc);
Debugger();
}
#endif
uvmexp.syscalls++;
p = curproc;
#ifdef DIAGNOSTIC
if (tf->tf_tstate & TSTATE_PRIV)
panic("syscall from kernel");
if (cpcb != &p->p_addr->u_pcb)
panic("syscall: cpcb/ppcb mismatch");
if (tf != (struct trapframe64 *)((caddr_t)cpcb + USPACE) - 1)
panic("syscall: trapframe");
#endif
sticks = p->p_sticks;
p->p_md.md_tf = tf;
new = code & (SYSCALL_G7RFLAG | SYSCALL_G2RFLAG);
code &= ~(SYSCALL_G7RFLAG | SYSCALL_G2RFLAG);
callp = p->p_emul->e_sysent;
nsys = p->p_emul->e_nsysent;
/*
* The first six system call arguments are in the six %o registers.
* Any arguments beyond that are in the `argument extension' area
* of the user's stack frame (see <machine/frame.h>).
*
* Check for ``special'' codes that alter this, namely syscall and
* __syscall. The latter takes a quad syscall number, so that other
* arguments are at their natural alignments. Adjust the number
* of ``easy'' arguments as appropriate; we will copy the hard
* ones later as needed.
*/
ap = &tf->tf_out[0];
nap = 6;
switch (code) {
case SYS_syscall:
code = *ap++;
nap--;
break;
case SYS___syscall:
if (code < nsys &&
callp[code].sy_call != callp[p->p_emul->e_nosys].sy_call)
break; /* valid system call */
if (tf->tf_out[6] & 1L) {
/* longs *are* quadwords */
code = ap[0];
ap += 1;
nap -= 1;
} else {
code = ap[_QUAD_LOWWORD];
ap += 2;
nap -= 2;
}
break;
}
#ifdef DEBUG
/* printf("code=%x, nsys=%x\n", code, nsys); */
if (trapdebug&(TDB_SYSCALL|TDB_FOLLOW))
printf("%d syscall(%d[%x]): tstate=%x:%x %s\n",
curproc?curproc->p_pid:-1, (int)code, (u_int)code,
(int)(tf->tf_tstate>>32), (int)(tf->tf_tstate),
(p->p_emul->e_syscallnames) ?
((code < 0 || code >= nsys) ?
"illegal syscall" :
p->p_emul->e_syscallnames[code]) :
"unknown syscall");
if (p->p_emul->e_syscallnames)
p->p_addr->u_pcb.lastcall =
((code < 0 || code >= nsys) ?
"illegal syscall" :
p->p_emul->e_syscallnames[code]);
#endif
if (code < 0 || code >= nsys)
callp += p->p_emul->e_nosys;
else if (tf->tf_out[6] & 1L) {
register64_t *argp;
#ifndef __arch64__
#ifdef DEBUG
printf("syscall(): 64-bit stack on a 32-bit kernel????\n");
Debugger();
#endif
#endif
/* 64-bit stack -- not really supported on 32-bit kernels */
callp += code;
i = callp->sy_narg; /* Why divide? */
#ifdef DEBUG
if (i != (long)callp->sy_argsize / sizeof(register64_t))
printf("syscall %s: narg=%hd, argsize=%hd, call=%p, argsz/reg64=%ld\n",
(p->p_emul->e_syscallnames) ? ((code < 0 || code >= nsys) ?
"illegal syscall" :
p->p_emul->e_syscallnames[code])
: "unknown syscall",
callp->sy_narg, callp->sy_argsize, callp->sy_call,
(long)callp->sy_argsize / sizeof(register64_t));
#endif
if (i > nap) { /* usually false */
#ifdef DEBUG
if (trapdebug&(TDB_SYSCALL|TDB_FOLLOW) || i>8) {
printf("Args64 %d>%d -- need to copyin\n", i , nap);
}
#endif
if (i > 8)
panic("syscall nargs");
/* Read the whole block in */
error = copyin((caddr_t)(u_long)tf->tf_out[6] + BIAS +
offsetof(struct frame64, fr_argx),
(caddr_t)&args.l[nap], (i - nap) * sizeof(register64_t));
i = nap;
}
/* It should be faster to do <=6 longword copies than call bcopy */
for (argp = &args.l[0]; i--;)
*argp++ = *ap++;
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSCALL))
ktrsyscall(p, code,
callp->sy_argsize, (register_t*)args.l);
#endif
if (error) goto bad;
#ifdef DEBUG
if (trapdebug&(TDB_SYSCALL|TDB_FOLLOW)) {
for (i=0; i < callp->sy_narg; i++)
printf("arg[%d]=%lx ", i, (long)(args.l[i]));
printf("\n");
}
if (trapdebug&(TDB_STOPCALL)) {
printf("stop precall\n");
Debugger();
}
#endif
} else {
register32_t *argp;
int j = 0;
/* 32-bit stack */
callp += code;
#if defined(__arch64__) && !defined(COMPAT_NETBSD32)
#ifdef DEBUG
printf("syscall(): 32-bit stack on a 64-bit kernel????\n");
Debugger();
#endif
#endif
i = (long)callp->sy_argsize / sizeof(register32_t);
if (i > nap) { /* usually false */
register32_t temp[6];
#ifdef DEBUG
if (trapdebug&(TDB_SYSCALL|TDB_FOLLOW) || i>8)
printf("Args %d>%d -- need to copyin\n", i , nap);
#endif
if (i > 8)
panic("syscall nargs");
/* Read the whole block in */
error = copyin((caddr_t)(u_long)(tf->tf_out[6] +
offsetof(struct frame32, fr_argx)),
(caddr_t)&temp, (i - nap) * sizeof(register32_t));
/* Copy each to the argument array */
for (j = 0; nap + j < i; j++)
args.i[nap+j] = temp[j];
#ifdef DEBUG
if (trapdebug & (TDB_SYSCALL|TDB_FOLLOW)) {
int k;
printf("Copyin args of %d from %p:\n", j,
(caddr_t)(u_long)(tf->tf_out[6] + offsetof(struct frame32, fr_argx)));
for (k = 0; k < j; k++)
printf("arg %d = %p at %d val %p\n", k, (void *)(u_long)temp[k], nap+k, (void *)(u_long)args.i[nap+k]);
}
#endif
i = nap;
}
/* Need to convert from int64 to int32 or we lose */
for (argp = &args.i[0]; i--;)
*argp++ = *ap++;
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSCALL)) {
#if defined(__arch64__)
register_t temp[8];
/* Need to xlate 32-bit->64-bit */
i = (long)callp->sy_argsize /
sizeof(register32_t);
for (j=0; j<i; j++)
temp[j] = args.i[j];
ktrsyscall(p, code,
i * sizeof(register_t), (register_t *)temp);
#else
ktrsyscall(p, code,
callp->sy_argsize, (register_t *)args.i);
#endif
}
#endif
if (error) {
goto bad;
}
#ifdef DEBUG
if (trapdebug&(TDB_SYSCALL|TDB_FOLLOW)) {
for (i=0; i < (long)callp->sy_argsize / sizeof(register32_t); i++)
printf("arg[%d]=%x ", i, (int)(args.i[i]));
printf("\n");
}
if (trapdebug&(TDB_STOPCALL)) {
printf("stop precall\n");
Debugger();
}
#endif
}
#ifdef SYSCALL_DEBUG
scdebug_call(p, code, (register_t *)&args);
#endif
rval[0] = 0;
rval[1] = tf->tf_out[1];
#ifdef DEBUG
if (callp->sy_call == sys_nosys) {
printf("trapdebug: emul %s UNIPL syscall %d:%s\n",
p->p_emul->e_name, (int)code,
p->p_emul->e_syscallnames ? (
(code < 0 || code >= nsys) ?
"illegal syscall" :
p->p_emul->e_syscallnames[code]) :
"unknown syscall");
}
#endif
error = (*callp->sy_call)(p, &args, rval);
switch (error) {
vaddr_t dest;
case 0:
/* Note: fork() does not return here in the child */
tf->tf_out[0] = rval[0];
tf->tf_out[1] = rval[1];
if (new) {
/* jmp %g2 (or %g7, deprecated) on success */
dest = tf->tf_global[new & SYSCALL_G2RFLAG ? 2 : 7];
#ifdef DEBUG
if (trapdebug&(TDB_SYSCALL|TDB_FOLLOW))
printf("syscall: return tstate=%llx new success to %p retval %lx:%lx\n",
(unsigned long long)tf->tf_tstate, (void *)(u_long)dest,
(u_long)rval[0], (u_long)rval[1]);
#endif
if (dest & 3) {
error = EINVAL;
goto bad;
}
} else {
/* old system call convention: clear C on success */
tf->tf_tstate &= ~(((int64_t)(ICC_C|XCC_C))<<TSTATE_CCR_SHIFT); /* success */
dest = tf->tf_npc;
#ifdef DEBUG
if (trapdebug&(TDB_SYSCALL|TDB_FOLLOW))
printf("syscall: return tstate=%llx old success to %p retval %lx:%lx\n",
(unsigned long long)tf->tf_tstate, (void *)(u_long)dest,
(u_long)rval[0], (u_long)rval[1]);
if (trapdebug&(TDB_SYSCALL|TDB_FOLLOW))
printf("old pc=%p npc=%p dest=%p\n",
(void *)(u_long)tf->tf_pc,
(void *)(u_long)tf->tf_npc,
(void *)(u_long)dest);
#endif
}
tf->tf_pc = dest;
tf->tf_npc = dest + 4;
break;
case ERESTART:
case EJUSTRETURN:
/* nothing to do */
break;
default:
bad:
if (p->p_emul->e_errno)
error = p->p_emul->e_errno[error];
tf->tf_out[0] = error;
tf->tf_tstate |= (((int64_t)(ICC_C|XCC_C))<<TSTATE_CCR_SHIFT); /* fail */
dest = tf->tf_npc;
tf->tf_pc = dest;
tf->tf_npc = dest + 4;
#ifdef DEBUG
if (trapdebug&(TDB_SYSCALL|TDB_FOLLOW))
printf("syscall: return tstate=%llx fail %d to %p\n",
(unsigned long long)tf->tf_tstate, error,
(void *)(long)dest);
#endif
break;
}
#ifdef SYSCALL_DEBUG
scdebug_ret(p, code, error, rval);
#endif
userret(p, pc, sticks);
#ifdef NOTDEF_DEBUG
if ( code == 202) {
/* Trap on __sysctl */
Debugger();
}
#endif
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSRET))
ktrsysret(p, code, error, rval[0]);
#endif
share_fpu(p, tf);
#ifdef DEBUG
if (trapdebug&(TDB_STOPCALL|TDB_SYSTOP)) {
Debugger();
}
#endif
#ifdef DEBUG
if (trapdebug & TDB_FRAME) {
print_trapframe(tf);
}
#endif
}
/*
* Process the tail end of a fork() for the child.
*/
void
child_return(arg)
void *arg;
{
struct proc *p = arg;
/*
* Return values in the frame set by cpu_fork().
*/
#ifdef NOTDEF_DEBUG
printf("child_return: proc=%p\n", p);
#endif
userret(p, p->p_md.md_tf->tf_pc, 0);
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSRET))
ktrsysret(p,
(p->p_flag & P_PPWAIT) ? SYS_vfork : SYS_fork, 0, 0);
#endif
}
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