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Commit 259d66a9 authored by David Mosberger's avatar David Mosberger
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ia64; Improve debug output from kernel unwinder. Based on patch by 

	Keith Owens.
parent 9f319191
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Inline Side-by-side
Showing with 106 additions and 65 deletions
arch/ia64/kernel/unwind.c
View file @ 259d66a9
......@@ -51,18 +51,24 @@
#define UNW_LOG_HASH_SIZE (UNW_LOG_CACHE_SIZE + 1)
#define UNW_HASH_SIZE (1 << UNW_LOG_HASH_SIZE)
#define UNW_DEBUG 0
#define UNW_STATS 0 /* WARNING: this disabled interrupts for long time-spans!! */
#if UNW_DEBUG
static long unw_debug_level = 255;
# define debug(level,format...) if (unw_debug_level > level) printk(format)
# define dprintk(format...) printk(format)
# define inline
#else
# define debug(level,format...)
# define dprintk(format...)
#endif
#ifdef UNW_DEBUG
static unsigned int unw_debug_level = UNW_DEBUG;
# ifdef CONFIG_KDB
# include <linux/kdb.h>
# define UNW_DEBUG_ON(n) (unw_debug_level >= n && !KDB_IS_RUNNING())
# define UNW_DPRINT(n, ...) if (UNW_DEBUG_ON(n)) kdb_printf(__VA_ARGS__)
# else /* !CONFIG_KDB */
# define UNW_DEBUG_ON(n) unw_debug_level >= n
/* Do not code a printk level, not all debug lines end in newline */
# define UNW_DPRINT(n, ...) if (UNW_DEBUG_ON(n)) printk(__VA_ARGS__)
# endif /* CONFIG_KDB */
# define inline
#else /* !UNW_DEBUG */
# define UNW_DEBUG_ON(n) 0
# define UNW_DPRINT(n, ...)
#endif /* UNW_DEBUG */
#if UNW_STATS
# define STAT(x...) x
......@@ -111,7 +117,7 @@ static struct {
/* script cache: */
struct unw_script cache[UNW_CACHE_SIZE];
# if UNW_DEBUG
# ifdef UNW_DEBUG
const char *preg_name[UNW_NUM_REGS];
# endif
# if UNW_STATS
......@@ -190,7 +196,7 @@ static struct {
struct_offset(struct unw_frame_info, fr_loc[31 - 16])/8,
},
.hash = { [0 ... UNW_HASH_SIZE - 1] = -1 },
#if UNW_DEBUG
#ifdef UNW_DEBUG
.preg_name = {
"pri_unat_gr", "pri_unat_mem", "bsp", "bspstore", "ar.pfs", "ar.rnat", "psp", "rp",
"r4", "r5", "r6", "r7",
......@@ -223,7 +229,7 @@ pt_regs_off (unsigned long reg)
else if (reg <= 31)
off = struct_offset(struct pt_regs, r16) + 8*(reg - 16);
else
dprintk("unwind: bad scratch reg r%lu\n", reg);
UNW_DPRINT(0, "unwind.%s: bad scratch reg r%lu\n", __FUNCTION__, reg);
return off;
}
......@@ -232,9 +238,12 @@ dump_info_pt(struct unw_frame_info *info, const char *func)
{
/* WAR for no struct pt_regs, may be caused by bad unwind data. KAO */
if (!info->pt) {
dprintk("unwind.%s: sp 0x%lx pt 0x%lx, set to 0x%lx\n", func, info->sp, info->pt, info->sp - 16);
UNW_DPRINT(0, "unwind.%s: sp 0x%lx pt 0x%lx, set to 0x%lx\n", func, info->sp, info->pt, info->sp - 16);
info->pt = info->sp - 16;
}
else {
UNW_DPRINT(3, "unwind.%s: sp 0x%lx pt 0x%lx\n", func, info->sp, info->pt);
}
}
int
......@@ -244,7 +253,7 @@ unw_access_gr (struct unw_frame_info *info, int regnum, unsigned long *val, char
struct unw_ireg *ireg;
if ((unsigned) regnum - 1 >= 127) {
dprintk("unwind: trying to access non-existent r%u\n", regnum);
UNW_DPRINT(0, "unwind.%s: trying to access non-existent r%u\n", __FUNCTION__, regnum);
return -1;
}
......@@ -289,8 +298,9 @@ unw_access_gr (struct unw_frame_info *info, int regnum, unsigned long *val, char
if ((unsigned long) addr < info->regstk.limit
|| (unsigned long) addr >= info->regstk.top)
{
dprintk("unwind: %p outside of regstk "
"[0x%lx-0x%lx)\n", (void *) addr,
UNW_DPRINT(0, "unwind.%s: %p outside of regstk "
"[0x%lx-0x%lx)\n",
__FUNCTION__, (void *) addr,
info->regstk.limit,
info->regstk.top);
return -1;
......@@ -322,7 +332,7 @@ unw_access_gr (struct unw_frame_info *info, int regnum, unsigned long *val, char
if ((unsigned long) addr < info->regstk.limit
|| (unsigned long) addr >= info->regstk.top)
{
dprintk("unwind: ignoring attempt to access register outside of rbs\n");
UNW_DPRINT(0, "unwind.%s: ignoring attempt to access register outside of rbs\n", __FUNCTION__);
return -1;
}
if ((unsigned long) nat_addr >= info->regstk.top)
......@@ -370,7 +380,7 @@ unw_access_br (struct unw_frame_info *info, int regnum, unsigned long *val, int
break;
default:
dprintk("unwind: trying to access non-existent b%u\n", regnum);
UNW_DPRINT(0, "unwind.%s: trying to access non-existent b%u\n", __FUNCTION__, regnum);
return -1;
}
if (write)
......@@ -387,7 +397,7 @@ unw_access_fr (struct unw_frame_info *info, int regnum, struct ia64_fpreg *val,
struct pt_regs *pt;
if ((unsigned) (regnum - 2) >= 126) {
dprintk("unwind: trying to access non-existent f%u\n", regnum);
UNW_DPRINT(0, "unwind.%s: trying to access non-existent f%u\n", __FUNCTION__, regnum);
return -1;
}
......@@ -495,7 +505,7 @@ unw_access_ar (struct unw_frame_info *info, int regnum, unsigned long *val, int
break;
default:
dprintk("unwind: trying to access non-existent ar%u\n", regnum);
UNW_DPRINT(0, "unwind.%s: trying to access non-existent ar%u\n", __FUNCTION__, regnum);
return -1;
}
......@@ -612,7 +622,7 @@ decode_abreg (unsigned char abreg, int memory)
default:
break;
}
dprintk("unwind: bad abreg=0x%x\n", abreg);
UNW_DPRINT(0, "unwind.%s: bad abreg=0x%x\n", __FUNCTION__, abreg);
return UNW_REG_LC;
}
......@@ -652,7 +662,7 @@ spill_next_when (struct unw_reg_info **regp, struct unw_reg_info *lim, unw_word
return;
}
}
dprintk("unwind: excess spill!\n");
UNW_DPRINT(0, "unwind.%s: excess spill!\n", __FUNCTION__);
}
static inline void
......@@ -765,10 +775,13 @@ desc_prologue (int body, unw_word rlen, unsigned char mask, unsigned char grsave
static inline void
desc_abi (unsigned char abi, unsigned char context, struct unw_state_record *sr)
{
if (abi == 0 && context == 'i')
if (abi == 0 && context == 'i') {
sr->flags |= UNW_FLAG_INTERRUPT_FRAME;
UNW_DPRINT(3, "unwind.%s: interrupt frame\n", __FUNCTION__);
}
else
dprintk("unwind: ignoring unwabi(abi=0x%x,context=0x%x)\n", abi, context);
UNW_DPRINT(0, "unwind%s: ignoring unwabi(abi=0x%x,context=0x%x)\n",
__FUNCTION__, abi, context);
}
static inline void
......@@ -1136,6 +1149,9 @@ script_lookup (struct unw_frame_info *info)
unsigned short index;
unsigned long ip, pr;
if (UNW_DEBUG_ON(0))
return 0; /* Always regenerate scripts in debug mode */
STAT(++unw.stat.cache.lookups);
ip = info->ip;
......@@ -1260,8 +1276,8 @@ static inline void
script_emit (struct unw_script *script, struct unw_insn insn)
{
if (script->count >= UNW_MAX_SCRIPT_LEN) {
dprintk("unwind: script exceeds maximum size of %u instructions!\n",
UNW_MAX_SCRIPT_LEN);
UNW_DPRINT(0, "unwind.%s: script exceeds maximum size of %u instructions!\n",
__FUNCTION__, UNW_MAX_SCRIPT_LEN);
return;
}
script->insn[script->count++] = insn;
......@@ -1302,7 +1318,7 @@ emit_nat_info (struct unw_state_record *sr, int i, struct unw_script *script)
break;
default:
dprintk("unwind: don't know how to emit nat info for where = %u\n", r->where);
UNW_DPRINT(0, "unwind.%s: don't know how to emit nat info for where = %u\n", __FUNCTION__, r->where);
return;
}
insn.opc = opc;
......@@ -1355,7 +1371,7 @@ compile_reg (struct unw_state_record *sr, int i, struct unw_script *script)
if (rval <= 9)
val = struct_offset(struct pt_regs, f6) + 16*(rval - 6);
else
dprintk("unwind: kernel may not touch f%lu\n", rval);
UNW_DPRINT(0, "unwind.%s: kernel may not touch f%lu\n", __FUNCTION__, rval);
}
break;
......@@ -1382,7 +1398,7 @@ compile_reg (struct unw_state_record *sr, int i, struct unw_script *script)
break;
default:
dprintk("unwind: register %u has unexpected `where' value of %u\n", i, r->where);
UNW_DPRINT(0, "unwind%s: register %u has unexpected `where' value of %u\n", __FUNCTION__, i, r->where);
break;
}
insn.opc = opc;
......@@ -1455,9 +1471,10 @@ build_script (struct unw_frame_info *info)
r->when = UNW_WHEN_NEVER;
sr.pr_val = info->pr;
UNW_DPRINT(3, "unwind.%s: ip 0x%lx\n", __FUNCTION__, ip);
script = script_new(ip);
if (!script) {
dprintk("unwind: failed to create unwind script\n");
UNW_DPRINT(0, "unwind.%s: failed to create unwind script\n", __FUNCTION__);
STAT(unw.stat.script.build_time += ia64_get_itc() - start);
return 0;
}
......@@ -1475,8 +1492,8 @@ build_script (struct unw_frame_info *info)
}
if (!e) {
/* no info, return default unwinder (leaf proc, no mem stack, no saved regs) */
dprintk("unwind: no unwind info for ip=0x%lx (prev ip=0x%lx)\n", ip,
unw.cache[info->prev_script].ip);
UNW_DPRINT(1, "unwind.%s: no unwind info for ip=0x%lx (prev ip=0x%lx)\n",
__FUNCTION__, ip, unw.cache[info->prev_script].ip);
sr.curr.reg[UNW_REG_RP].where = UNW_WHERE_BR;
sr.curr.reg[UNW_REG_RP].when = -1;
sr.curr.reg[UNW_REG_RP].val = 0;
......@@ -1524,26 +1541,28 @@ build_script (struct unw_frame_info *info)
sr.curr.reg[UNW_REG_RP].where = UNW_WHERE_BR;
sr.curr.reg[UNW_REG_RP].when = -1;
sr.curr.reg[UNW_REG_RP].val = sr.return_link_reg;
UNW_DPRINT(1, "unwind.%s: using default for rp at ip=0x%lx where=%d val=0x%lx\n",
__FUNCTION__, ip, sr.curr.reg[UNW_REG_RP].where, sr.curr.reg[UNW_REG_RP].val);
}
#if UNW_DEBUG
printk("unwind: state record for func 0x%lx, t=%u:\n",
table->segment_base + e->start_offset, sr.when_target);
#ifdef UNW_DEBUG
UNW_DPRINT(1, "unwind.%s: state record for func 0x%lx, t=%u:\n",
__FUNCTION__, table->segment_base + e->start_offset, sr.when_target);
for (r = sr.curr.reg; r < sr.curr.reg + UNW_NUM_REGS; ++r) {
if (r->where != UNW_WHERE_NONE || r->when != UNW_WHEN_NEVER) {
printk(" %s <- ", unw.preg_name[r - sr.curr.reg]);
UNW_DPRINT(1, " %s <- ", unw.preg_name[r - sr.curr.reg]);
switch (r->where) {
case UNW_WHERE_GR: printk("r%lu", r->val); break;
case UNW_WHERE_FR: printk("f%lu", r->val); break;
case UNW_WHERE_BR: printk("b%lu", r->val); break;
case UNW_WHERE_SPREL: printk("[sp+0x%lx]", r->val); break;
case UNW_WHERE_PSPREL: printk("[psp+0x%lx]", r->val); break;
case UNW_WHERE_GR: UNW_DPRINT(1, "r%lu", r->val); break;
case UNW_WHERE_FR: UNW_DPRINT(1, "f%lu", r->val); break;
case UNW_WHERE_BR: UNW_DPRINT(1, "b%lu", r->val); break;
case UNW_WHERE_SPREL: UNW_DPRINT(1, "[sp+0x%lx]", r->val); break;
case UNW_WHERE_PSPREL: UNW_DPRINT(1, "[psp+0x%lx]", r->val); break;
case UNW_WHERE_NONE:
printk("%s+0x%lx", unw.preg_name[r - sr.curr.reg], r->val);
UNW_DPRINT(1, "%s+0x%lx", unw.preg_name[r - sr.curr.reg], r->val);
break;
default: printk("BADWHERE(%d)", r->where); break;
default: UNW_DPRINT(1, "BADWHERE(%d)", r->where); break;
}
printk("\t\t%d\n", r->when);
UNW_DPRINT(1, "\t\t%d\n", r->when);
}
}
#endif
......@@ -1648,7 +1667,7 @@ run_script (struct unw_script *script, struct unw_frame_info *state)
}
else {
s[dst] = 0;
dprintk("unwind.%s: no state->pt, dst=%ld, val=%ld\n", __FUNCTION__, dst, val);
UNW_DPRINT(0, "unwind.%s: no state->pt, dst=%ld, val=%ld\n", __FUNCTION__, dst, val);
}
break;
......@@ -1677,11 +1696,11 @@ run_script (struct unw_script *script, struct unw_frame_info *state)
break;
case UNW_INSN_LOAD:
#if UNW_DEBUG
#ifdef UNW_DEBUG
if ((s[val] & (local_cpu_data->unimpl_va_mask | 0x7)) != 0
|| s[val] < TASK_SIZE)
{
debug(1, "unwind: rejecting bad psp=0x%lx\n", s[val]);
UNW_DPRINT(0, "unwind.%s: rejecting bad psp=0x%lx\n", __FUNCTION__, s[val]);
break;
}
#endif
......@@ -1714,7 +1733,8 @@ find_save_locs (struct unw_frame_info *info)
if ((info->ip & (local_cpu_data->unimpl_va_mask | 0xf)) || info->ip < TASK_SIZE) {
/* don't let obviously bad addresses pollute the cache */
debug(1, "unwind: rejecting bad ip=0x%lx\n", info->ip);
/* FIXME: should really be level 0 but it occurs too often. KAO */
UNW_DPRINT(1, "unwind.%s: rejecting bad ip=0x%lx\n", __FUNCTION__, info->ip);
info->rp_loc = 0;
return -1;
}
......@@ -1723,8 +1743,8 @@ find_save_locs (struct unw_frame_info *info)
if (!scr) {
scr = build_script(info);
if (!scr) {
dprintk("unwind: failed to locate/build unwind script for ip %lx\n",
info->ip);
UNW_DPRINT(0, "unwind.%s: failed to locate/build unwind script for ip %lx\n",
__FUNCTION__, info->ip);
return -1;
}
have_write_lock = 1;
......@@ -1757,7 +1777,8 @@ unw_unwind (struct unw_frame_info *info)
/* restore the ip */
if (!info->rp_loc) {
debug(1, "unwind: failed to locate return link (ip=0x%lx)!\n", info->ip);
/* FIXME: should really be level 0 but it occurs too often. KAO */
UNW_DPRINT(1, "unwind.%s: failed to locate return link (ip=0x%lx)!\n", __FUNCTION__, info->ip);
STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
return -1;
}
......@@ -1767,14 +1788,14 @@ unw_unwind (struct unw_frame_info *info)
* We don't have unwind info for the gate page, so we consider that part
* of user-space for the purpose of unwinding.
*/
debug(1, "unwind: reached user-space (ip=0x%lx)\n", ip);
UNW_DPRINT(2, "unwind.%s: reached user-space (ip=0x%lx)\n", __FUNCTION__, ip);
STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
return -1;
}
/* restore the cfm: */
if (!info->pfs_loc) {
dprintk("unwind: failed to locate ar.pfs!\n");
UNW_DPRINT(0, "unwind.%s: failed to locate ar.pfs!\n", __FUNCTION__);
STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
return -1;
}
......@@ -1789,12 +1810,13 @@ unw_unwind (struct unw_frame_info *info)
num_regs = *info->cfm_loc & 0x7f; /* size of frame */
info->pfs_loc =
(unsigned long *) (info->pt + struct_offset(struct pt_regs, ar_pfs));
UNW_DPRINT(3, "unwind.%s: interrupt_frame pt 0x%lx\n", __FUNCTION__, info->pt);
} else
num_regs = (*info->cfm_loc >> 7) & 0x7f; /* size of locals */
info->bsp = (unsigned long) ia64_rse_skip_regs((unsigned long *) info->bsp, -num_regs);
if (info->bsp < info->regstk.limit || info->bsp > info->regstk.top) {
dprintk("unwind: bsp (0x%lx) out of range [0x%lx-0x%lx]\n",
info->bsp, info->regstk.limit, info->regstk.top);
UNW_DPRINT(0, "unwind.%s: bsp (0x%lx) out of range [0x%lx-0x%lx]\n",
__FUNCTION__, info->bsp, info->regstk.limit, info->regstk.top);
STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
return -1;
}
......@@ -1802,14 +1824,14 @@ unw_unwind (struct unw_frame_info *info)
/* restore the sp: */
info->sp = info->psp;
if (info->sp < info->memstk.top || info->sp > info->memstk.limit) {
dprintk("unwind: sp (0x%lx) out of range [0x%lx-0x%lx]\n",
info->sp, info->memstk.top, info->memstk.limit);
UNW_DPRINT(0, "unwind.%s: sp (0x%lx) out of range [0x%lx-0x%lx]\n",
__FUNCTION__, info->sp, info->memstk.top, info->memstk.limit);
STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
return -1;
}
if (info->ip == prev_ip && info->sp == prev_sp && info->bsp == prev_bsp) {
dprintk("unwind: ip, sp, bsp remain unchanged; stopping here (ip=0x%lx)\n", ip);
UNW_DPRINT(0, "unwind.%s: ip, sp, bsp remain unchanged; stopping here (ip=0x%lx)\n", __FUNCTION__, ip);
STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
return -1;
}
......@@ -1833,7 +1855,7 @@ unw_unwind_to_user (struct unw_frame_info *info)
while (unw_unwind(info) >= 0) {
if (unw_get_rp(info, &ip) < 0) {
unw_get_ip(info, &ip);
dprintk("unwind: failed to read return pointer (ip=0x%lx)\n", ip);
UNW_DPRINT(0, "unwind.%s: failed to read return pointer (ip=0x%lx)\n", __FUNCTION__, ip);
return -1;
}
/*
......@@ -1844,7 +1866,7 @@ unw_unwind_to_user (struct unw_frame_info *info)
return 0;
}
unw_get_ip(info, &ip);
dprintk("unwind: failed to unwind to user-level (ip=0x%lx)\n", ip);
UNW_DPRINT(0, "unwind.%s: failed to unwind to user-level (ip=0x%lx)\n", __FUNCTION__, ip);
return -1;
}
......@@ -1891,6 +1913,24 @@ unw_init_frame_info (struct unw_frame_info *info, struct task_struct *t, struct
info->bsp = (unsigned long) ia64_rse_skip_regs((unsigned long *) info->regstk.top, -sol);
info->ip = sw->b0;
info->pr = sw->pr;
UNW_DPRINT(3,
"unwind.%s\n"
" rbslimit 0x%lx\n"
" rbstop 0x%lx\n"
" stklimit 0x%lx\n"
" stktop 0x%lx\n"
" task 0x%lx\n"
" sw 0x%lx\n",
__FUNCTION__, rbslimit, rbstop, stklimit, stktop,
(unsigned long)(info->task),
(unsigned long)(info->sw));
UNW_DPRINT(3,
" sp/psp 0x%lx\n"
" sol 0x%lx\n"
" bsp 0x%lx\n"
" ip 0x%lx\n"
" pr 0x%lx\n",
info->sp, sol, info->bsp, info->ip, info->pr);
find_save_locs(info);
STAT(unw.stat.api.init_time += ia64_get_itc() - start; local_irq_restore(flags));
......@@ -1901,6 +1941,7 @@ unw_init_from_blocked_task (struct unw_frame_info *info, struct task_struct *t)
{
struct switch_stack *sw = (struct switch_stack *) (t->thread.ksp + 16);
UNW_DPRINT(1, "unwind.%s\n", __FUNCTION__);
unw_init_frame_info(info, t, sw);
}
......@@ -1928,7 +1969,7 @@ unw_add_unwind_table (const char *name, unsigned long segment_base, unsigned lon
unsigned long flags;
if (end - start <= 0) {
dprintk("unwind: ignoring attempt to insert empty unwind table\n");
UNW_DPRINT(0, "unwind.%s: ignoring attempt to insert empty unwind table\n", __FUNCTION__);
return 0;
}
......@@ -1958,13 +1999,13 @@ unw_remove_unwind_table (void *handle)
long index;
if (!handle) {
dprintk("unwind: ignoring attempt to remove non-existent unwind table\n");
UNW_DPRINT(0, "unwind.%s: ignoring attempt to remove non-existent unwind table\n", __FUNCTION__);
return;
}
table = handle;
if (table == &unw.kernel_table) {
dprintk("unwind: sorry, freeing the kernel's unwind table is a no-can-do!\n");
UNW_DPRINT(0, "unwind.%s: sorry, freeing the kernel's unwind table is a no-can-do!\n", __FUNCTION__);
return;
}
......@@ -1976,7 +2017,7 @@ unw_remove_unwind_table (void *handle)
if (prev->next == table)
break;
if (!prev) {
dprintk("unwind: failed to find unwind table %p\n", (void *) table);
UNW_DPRINT(0, "unwind.%s: failed to find unwind table %p\n", __FUNCTION__, (void *) table);
spin_unlock_irqrestore(&unw.lock, flags);
return;
}
......
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