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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/amd64/compile/hs32/modules/usr/src/sys/modules/if_carp/@/ia64/ia64/unwind.c |
/*-
* Copyright (c) 2003, 2004 Marcel Moolenaar
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/ia64/ia64/unwind.c 145137 2005-04-16 05:38:59Z marcel $");
#include <sys/param.h>
#include <sys/kdb.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <machine/frame.h>
#include <machine/md_var.h>
#include <machine/pcb.h>
#include <machine/unwind.h>
#include <uwx.h>
MALLOC_DEFINE(M_UNWIND, "Unwind", "Unwind information");
struct unw_entry {
uint64_t ue_start; /* procedure start */
uint64_t ue_end; /* procedure end */
uint64_t ue_info; /* offset to procedure descriptors */
};
struct unw_table {
LIST_ENTRY(unw_table) ut_link;
uint64_t ut_base;
uint64_t ut_limit;
struct unw_entry *ut_start;
struct unw_entry *ut_end;
};
LIST_HEAD(unw_table_list, unw_table);
static struct unw_table_list unw_tables;
#ifdef KDB
#define KDBHEAPSZ 8192
struct mhdr {
uint32_t sig;
#define MSIG_FREE 0x65657246 /* "Free". */
#define MSIG_USED 0x64657355 /* "Used". */
uint32_t size;
int32_t next;
int32_t prev;
};
static struct mhdr *kdbheap;
#endif /* KDB */
static void *
unw_alloc(size_t sz)
{
#ifdef KDB
struct mhdr *hdr, *hfree;
if (kdb_active) {
sz = (sz + 15) >> 4;
hdr = kdbheap;
while (hdr->sig != MSIG_FREE || hdr->size < sz) {
if (hdr->next == -1)
return (NULL);
hdr = kdbheap + hdr->next;
}
if (hdr->size > sz + 1) {
hfree = hdr + sz + 1;
hfree->sig = MSIG_FREE;
hfree->size = hdr->size - sz - 1;
hfree->prev = hdr - kdbheap;
hfree->next = hdr->next;
hdr->size = sz;
hdr->next = hfree - kdbheap;
if (hfree->next >= 0) {
hfree = kdbheap + hfree->next;
hfree->prev = hdr->next;
}
}
hdr->sig = MSIG_USED;
return (void*)(hdr + 1);
}
#endif
return (malloc(sz, M_UNWIND, M_NOWAIT));
}
static void
unw_free(void *p)
{
#ifdef KDB
struct mhdr *hdr, *hfree;
if (kdb_active) {
hdr = (struct mhdr*)p - 1;
if (hdr->sig != MSIG_USED)
return;
hdr->sig = MSIG_FREE;
if (hdr->prev >= 0 && kdbheap[hdr->prev].sig == MSIG_FREE) {
hfree = kdbheap + hdr->prev;
hfree->size += hdr->size + 1;
hfree->next = hdr->next;
if (hdr->next >= 0) {
hfree = kdbheap + hdr->next;
hfree->prev = hdr->prev;
}
} else if (hdr->next >= 0 &&
kdbheap[hdr->next].sig == MSIG_FREE) {
hfree = kdbheap + hdr->next;
hdr->size += hfree->size + 1;
hdr->next = hfree->next;
if (hdr->next >= 0) {
hfree = kdbheap + hdr->next;
hfree->prev = hdr - kdbheap;
}
}
return;
}
#endif
free(p, M_UNWIND);
}
static struct unw_table *
unw_table_lookup(uint64_t ip)
{
struct unw_table *ut;
LIST_FOREACH(ut, &unw_tables, ut_link) {
if (ip >= ut->ut_base && ip < ut->ut_limit)
return (ut);
}
return (NULL);
}
static uint64_t
unw_copyin_from_frame(struct trapframe *tf, uint64_t from)
{
uint64_t val;
int reg;
if (from == UWX_REG_AR_PFS)
val = tf->tf_special.pfs;
else if (from == UWX_REG_PREDS)
val = tf->tf_special.pr;
else if (from == UWX_REG_AR_RNAT)
val = tf->tf_special.rnat;
else if (from == UWX_REG_AR_UNAT)
val = tf->tf_special.unat;
else if (from >= UWX_REG_GR(0) && from <= UWX_REG_GR(127)) {
reg = from - UWX_REG_GR(0);
if (reg == 1)
val = tf->tf_special.gp;
else if (reg == 12)
val = tf->tf_special.sp;
else if (reg == 13)
val = tf->tf_special.tp;
else if (reg >= 2 && reg <= 3)
val = (&tf->tf_scratch.gr2)[reg - 2];
else if (reg >= 8 && reg <= 11)
val = (&tf->tf_scratch.gr8)[reg - 8];
else if (reg >= 14 && reg <= 31)
val = (&tf->tf_scratch.gr14)[reg - 14];
else
goto oops;
} else if (from >= UWX_REG_BR(0) && from <= UWX_REG_BR(7)) {
reg = from - UWX_REG_BR(0);
if (reg == 0)
val = tf->tf_special.rp;
else if (reg >= 6 && reg <= 7)
val = (&tf->tf_scratch.br6)[reg - 6];
else
goto oops;
} else
goto oops;
return (val);
oops:
printf("UNW: %s(%p, %lx)\n", __func__, tf, from);
return (0UL);
}
static uint64_t
unw_copyin_from_pcb(struct pcb *pcb, uint64_t from)
{
uint64_t val;
int reg;
if (from == UWX_REG_AR_PFS)
val = pcb->pcb_special.pfs;
else if (from == UWX_REG_PREDS)
val = pcb->pcb_special.pr;
else if (from == UWX_REG_AR_RNAT)
val = pcb->pcb_special.rnat;
else if (from == UWX_REG_AR_UNAT)
val = pcb->pcb_special.unat;
else if (from >= UWX_REG_GR(0) && from <= UWX_REG_GR(127)) {
reg = from - UWX_REG_GR(0);
if (reg == 1)
val = pcb->pcb_special.gp;
else if (reg == 12)
val = pcb->pcb_special.sp;
else if (reg == 13)
val = pcb->pcb_special.tp;
else if (reg >= 4 && reg <= 7)
val = (&pcb->pcb_preserved.gr4)[reg - 4];
else
goto oops;
} else if (from >= UWX_REG_BR(0) && from <= UWX_REG_BR(7)) {
reg = from - UWX_REG_BR(0);
if (reg == 0)
val = pcb->pcb_special.rp;
else if (reg >= 1 && reg <= 5)
val = (&pcb->pcb_preserved.br1)[reg - 1];
else
goto oops;
} else
goto oops;
return (val);
oops:
printf("UNW: %s(%p, %lx)\n", __func__, pcb, from);
return (0UL);
}
static int
unw_cb_copyin(int req, char *to, uint64_t from, int len, intptr_t tok)
{
struct unw_regstate *rs = (void*)tok;
uint64_t val;
switch (req) {
case UWX_COPYIN_UINFO:
break;
case UWX_COPYIN_MSTACK:
*((uint64_t*)to) = *((uint64_t*)from);
return (8);
case UWX_COPYIN_RSTACK:
*((uint64_t*)to) = *((uint64_t*)from);
return (8);
case UWX_COPYIN_REG:
if (rs->frame != NULL)
val = unw_copyin_from_frame(rs->frame, from);
else if (rs->pcb != NULL)
val = unw_copyin_from_pcb(rs->pcb, from);
else
goto oops;
*((uint64_t*)to) = val;
return (len);
}
oops:
printf("UNW: %s(%d, %p, %lx, %d, %lx)\n", __func__, req, to, from,
len, tok);
return (0);
}
static int
unw_cb_lookup(int req, uint64_t ip, intptr_t tok, uint64_t **vec)
{
struct unw_regstate *rs = (void*)tok;
struct unw_table *ut;
switch (req) {
case UWX_LKUP_LOOKUP:
ut = unw_table_lookup(ip);
if (ut == NULL)
return (UWX_LKUP_NOTFOUND);
rs->keyval[0] = UWX_KEY_TBASE;
rs->keyval[1] = ut->ut_base;
rs->keyval[2] = UWX_KEY_USTART;
rs->keyval[3] = (intptr_t)ut->ut_start;
rs->keyval[4] = UWX_KEY_UEND;
rs->keyval[5] = (intptr_t)ut->ut_end;
rs->keyval[6] = 0;
rs->keyval[7] = 0;
*vec = rs->keyval;
return (UWX_LKUP_UTABLE);
case UWX_LKUP_FREE:
return (0);
}
return (UWX_LKUP_ERR);
}
int
unw_create_from_frame(struct unw_regstate *rs, struct trapframe *tf)
{
uint64_t bsp, ip;
int uwxerr;
rs->frame = tf;
rs->pcb = NULL;
rs->env = uwx_init();
if (rs->env == NULL)
return (ENOMEM);
uwxerr = uwx_register_callbacks(rs->env, (intptr_t)rs,
unw_cb_copyin, unw_cb_lookup);
if (uwxerr)
return (EINVAL); /* XXX */
bsp = tf->tf_special.bspstore + tf->tf_special.ndirty;
bsp = ia64_bsp_adjust(bsp, -IA64_CFM_SOF(tf->tf_special.cfm));
ip = tf->tf_special.iip + ((tf->tf_special.psr >> 41) & 3);
uwxerr = uwx_init_context(rs->env, ip, tf->tf_special.sp, bsp,
tf->tf_special.cfm);
return ((uwxerr) ? EINVAL : 0); /* XXX */
}
int
unw_create_from_pcb(struct unw_regstate *rs, struct pcb *pcb)
{
uint64_t bsp, cfm, ip;
int uwxerr;
rs->frame = NULL;
rs->pcb = pcb;
rs->env = uwx_init();
if (rs->env == NULL)
return (ENOMEM);
uwxerr = uwx_register_callbacks(rs->env, (intptr_t)rs,
unw_cb_copyin, unw_cb_lookup);
if (uwxerr)
return (EINVAL); /* XXX */
bsp = pcb->pcb_special.bspstore;
if (pcb->pcb_special.__spare == ~0UL) {
ip = pcb->pcb_special.iip + ((pcb->pcb_special.psr >> 41) & 3);
cfm = pcb->pcb_special.cfm;
bsp += pcb->pcb_special.ndirty;
bsp = ia64_bsp_adjust(bsp, -IA64_CFM_SOF(cfm));
} else {
ip = pcb->pcb_special.rp;
cfm = pcb->pcb_special.pfs;
bsp = ia64_bsp_adjust(bsp, -IA64_CFM_SOL(cfm));
}
uwxerr = uwx_init_context(rs->env, ip, pcb->pcb_special.sp, bsp, cfm);
return ((uwxerr) ? EINVAL : 0); /* XXX */
}
void
unw_delete(struct unw_regstate *rs)
{
if (rs->env != NULL)
uwx_free(rs->env);
}
int
unw_step(struct unw_regstate *rs)
{
int err;
switch (uwx_step(rs->env)) {
case UWX_ABI_FRAME:
err = ERESTART;
break;
case UWX_BOTTOM:
err = EJUSTRETURN;
break;
case UWX_OK:
err = 0;
break;
default:
err = EINVAL; /* XXX */
break;
}
return (err);
}
int
unw_get_bsp(struct unw_regstate *s, uint64_t *r)
{
int uwxerr;
uwxerr = uwx_get_reg(s->env, UWX_REG_BSP, r);
return ((uwxerr) ? EINVAL : 0); /* XXX */
}
int
unw_get_cfm(struct unw_regstate *s, uint64_t *r)
{
int uwxerr;
uwxerr = uwx_get_reg(s->env, UWX_REG_CFM, r);
return ((uwxerr) ? EINVAL : 0); /* XXX */
}
int
unw_get_ip(struct unw_regstate *s, uint64_t *r)
{
int uwxerr;
uwxerr = uwx_get_reg(s->env, UWX_REG_IP, r);
return ((uwxerr) ? EINVAL : 0); /* XXX */
}
int
unw_get_sp(struct unw_regstate *s, uint64_t *r)
{
int uwxerr;
uwxerr = uwx_get_reg(s->env, UWX_REG_SP, r);
return ((uwxerr) ? EINVAL : 0); /* XXX */
}
int
unw_table_add(uint64_t base, uint64_t start, uint64_t end)
{
struct unw_table *ut;
ut = malloc(sizeof(struct unw_table), M_UNWIND, M_WAITOK);
ut->ut_base = base;
ut->ut_start = (struct unw_entry*)start;
ut->ut_end = (struct unw_entry*)end;
ut->ut_limit = base + ut->ut_end[-1].ue_end;
LIST_INSERT_HEAD(&unw_tables, ut, ut_link);
if (bootverbose)
printf("UNWIND: table added: base=%lx, start=%lx, end=%lx\n",
base, start, end);
return (0);
}
void
unw_table_remove(uint64_t base)
{
struct unw_table *ut;
ut = unw_table_lookup(base);
if (ut != NULL) {
LIST_REMOVE(ut, ut_link);
free(ut, M_UNWIND);
if (bootverbose)
printf("UNWIND: table removed: base=%lx\n", base);
}
}
static void
unw_initialize(void *dummy __unused)
{
LIST_INIT(&unw_tables);
uwx_register_alloc_cb(unw_alloc, unw_free);
#ifdef KDB
kdbheap = malloc(KDBHEAPSZ, M_UNWIND, M_WAITOK);
kdbheap->sig = MSIG_FREE;
kdbheap->size = (KDBHEAPSZ - sizeof(struct mhdr)) >> 4;
kdbheap->next = -1;
kdbheap->prev = -1;
#endif
}
SYSINIT(unwind, SI_SUB_KMEM, SI_ORDER_ANY, unw_initialize, 0);