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| Current File : //sys/amd64/compile/hs32/modules/usr/src/sys/modules/dtrace/prototype/@/sparc64/sparc64/db_trace.c |
/*-
* Copyright (c) 2001 Jake Burkholder.
* 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 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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/sparc64/sparc64/db_trace.c 217265 2011-01-11 13:59:06Z jhb $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kdb.h>
#include <sys/proc.h>
#include <sys/stack.h>
#include <sys/sysent.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
#include <vm/vm_map.h>
#include <machine/cpu.h>
#include <machine/pcb.h>
#include <machine/stack.h>
#include <machine/trap.h>
#include <machine/vmparam.h>
#include <ddb/ddb.h>
#include <ddb/db_access.h>
#include <ddb/db_sym.h>
#include <ddb/db_variables.h>
#include <ddb/db_watch.h>
static db_varfcn_t db_frame;
#define DB_OFFSET(x) (db_expr_t *)offsetof(struct trapframe, x)
struct db_variable db_regs[] = {
{ "g0", DB_OFFSET(tf_global[0]), db_frame },
{ "g1", DB_OFFSET(tf_global[1]), db_frame },
{ "g2", DB_OFFSET(tf_global[2]), db_frame },
{ "g3", DB_OFFSET(tf_global[3]), db_frame },
{ "g4", DB_OFFSET(tf_global[4]), db_frame },
{ "g5", DB_OFFSET(tf_global[5]), db_frame },
{ "g6", DB_OFFSET(tf_global[6]), db_frame },
{ "g7", DB_OFFSET(tf_global[7]), db_frame },
{ "i0", DB_OFFSET(tf_out[0]), db_frame },
{ "i1", DB_OFFSET(tf_out[1]), db_frame },
{ "i2", DB_OFFSET(tf_out[2]), db_frame },
{ "i3", DB_OFFSET(tf_out[3]), db_frame },
{ "i4", DB_OFFSET(tf_out[4]), db_frame },
{ "i5", DB_OFFSET(tf_out[5]), db_frame },
{ "i6", DB_OFFSET(tf_out[6]), db_frame },
{ "i7", DB_OFFSET(tf_out[7]), db_frame },
{ "tnpc", DB_OFFSET(tf_tnpc), db_frame },
{ "tpc", DB_OFFSET(tf_tpc), db_frame },
{ "tstate", DB_OFFSET(tf_tstate), db_frame },
};
struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]);
static int
db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
{
uint64_t *reg;
if (kdb_frame == NULL)
return (0);
reg = (uint64_t*)((uintptr_t)kdb_frame + (uintptr_t)vp->valuep);
if (op == DB_VAR_GET)
*valuep = *reg;
else
*reg = *valuep;
return (1);
}
/*
* User stack trace (debugging aid).
*/
static void
db_utrace(struct thread *td, struct trapframe *tf, int count)
{
struct pcb *pcb;
db_addr_t sp, rsp, o7, pc;
int i, found;
pcb = td->td_pcb;
sp = db_get_value((db_addr_t)&tf->tf_sp, sizeof(tf->tf_sp), FALSE);
o7 = db_get_value((db_addr_t)&tf->tf_out[7], sizeof(tf->tf_out[7]),
FALSE);
pc = db_get_value((db_addr_t)&tf->tf_tpc, sizeof(tf->tf_tpc), FALSE);
db_printf("user trace: trap %%o7=%#lx\n", o7);
while (count-- && sp != 0 && !db_pager_quit) {
db_printf("pc %#lx, sp %#lx\n", pc, sp);
/* First, check whether the frame is in the pcb. */
found = 0;
for (i = 0; i < pcb->pcb_nsaved; i++) {
if (pcb->pcb_rwsp[i] == sp) {
found = 1;
sp = pcb->pcb_rw[i].rw_in[6];
pc = pcb->pcb_rw[i].rw_in[7];
break;
}
}
if (!found) {
rsp = sp + SPOFF;
sp = 0;
if (copyin((void *)(rsp + offsetof(struct frame, fr_fp)),
&sp, sizeof(sp)) != 0 ||
copyin((void *)(rsp + offsetof(struct frame, fr_pc)),
&pc, sizeof(pc)) != 0)
break;
}
}
db_printf("done\n");
}
static int
db_print_trap(struct thread *td, struct trapframe *tf, int count)
{
struct proc *p;
const char *symname;
c_db_sym_t sym;
db_expr_t diff;
db_addr_t func;
db_addr_t tpc;
u_long type;
u_long sfar;
u_long sfsr;
u_long tar;
u_long level;
u_long pil;
u_long code;
u_long o7;
int user;
p = td->td_proc;
type = db_get_value((db_addr_t)&tf->tf_type,
sizeof(tf->tf_type), FALSE);
db_printf("-- %s", trap_msg[type & ~T_KERNEL]);
switch (type & ~T_KERNEL) {
case T_DATA_PROTECTION:
tar = (u_long)db_get_value((db_addr_t)&tf->tf_tar,
sizeof(tf->tf_tar), FALSE);
db_printf(" tar=%#lx", tar);
/* fall through */
case T_DATA_EXCEPTION:
case T_INSTRUCTION_EXCEPTION:
case T_MEM_ADDRESS_NOT_ALIGNED:
sfar = (u_long)db_get_value((db_addr_t)&tf->tf_sfar,
sizeof(tf->tf_sfar), FALSE);
sfsr = (u_long)db_get_value((db_addr_t)&tf->tf_sfsr,
sizeof(tf->tf_sfsr), FALSE);
db_printf(" sfar=%#lx sfsr=%#lx", sfar, sfsr);
break;
case T_DATA_MISS:
case T_INSTRUCTION_MISS:
tar = (u_long)db_get_value((db_addr_t)&tf->tf_tar,
sizeof(tf->tf_tar), FALSE);
db_printf(" tar=%#lx", tar);
break;
case T_SYSCALL:
code = db_get_value((db_addr_t)&tf->tf_global[1],
sizeof(tf->tf_global[1]), FALSE);
db_printf(" (%ld", code);
if (code >= 0 && code < p->p_sysent->sv_size) {
func = (db_addr_t)p->p_sysent->sv_table[code].sy_call;
sym = db_search_symbol(func, DB_STGY_ANY, &diff);
if (sym != DB_SYM_NULL && diff == 0) {
db_symbol_values(sym, &symname, NULL);
db_printf(", %s, %s", p->p_sysent->sv_name,
symname);
}
db_printf(")");
}
break;
case T_INTERRUPT:
level = (u_long)db_get_value((db_addr_t)&tf->tf_level,
sizeof(tf->tf_level), FALSE);
pil = (u_long)db_get_value((db_addr_t)&tf->tf_pil,
sizeof(tf->tf_pil), FALSE);
db_printf(" level=%#lx pil=%#lx", level, pil);
break;
default:
break;
}
o7 = (u_long)db_get_value((db_addr_t)&tf->tf_out[7],
sizeof(tf->tf_out[7]), FALSE);
db_printf(" %%o7=%#lx --\n", o7);
user = (type & T_KERNEL) == 0;
if (user) {
tpc = db_get_value((db_addr_t)&tf->tf_tpc,
sizeof(tf->tf_tpc), FALSE);
db_printf("userland() at ");
db_printsym(tpc, DB_STGY_PROC);
db_printf("\n");
db_utrace(td, tf, count);
}
return (user);
}
static int
db_backtrace(struct thread *td, struct frame *fp, int count)
{
struct trapframe *tf;
const char *name;
c_db_sym_t sym;
db_expr_t offset;
db_expr_t value;
db_addr_t npc;
db_addr_t pc;
int trap;
int user;
if (count == -1)
count = 1024;
trap = 0;
user = 0;
npc = 0;
while (count-- && !user && !db_pager_quit) {
pc = (db_addr_t)db_get_value((db_addr_t)&fp->fr_pc,
sizeof(fp->fr_pc), FALSE);
if (trap) {
pc = npc;
trap = 0;
}
if (!INKERNEL((vm_offset_t)pc))
break;
sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
if (sym == C_DB_SYM_NULL) {
value = 0;
name = NULL;
} else
db_symbol_values(sym, &name, &value);
if (name == NULL)
name = "(null)";
fp = (struct frame *)(db_get_value((db_addr_t)&fp->fr_fp,
sizeof(fp->fr_fp), FALSE) + SPOFF);
if ((value > (u_long)tl_trap_begin &&
value < (u_long)tl_trap_end) ||
(value > (u_long)tl_text_begin &&
value < (u_long)tl_text_end)) {
tf = (struct trapframe *)(fp + 1);
npc = db_get_value((db_addr_t)&tf->tf_tpc,
sizeof(tf->tf_tpc), FALSE);
user = db_print_trap(td, tf, count);
trap = 1;
} else {
db_printf("%s() at ", name);
db_printsym(pc, DB_STGY_PROC);
db_printf("\n");
}
}
return (0);
}
void
db_trace_self(void)
{
db_backtrace(curthread,
(struct frame *)__builtin_frame_address(1), -1);
}
int
db_trace_thread(struct thread *td, int count)
{
struct pcb *ctx;
ctx = kdb_thr_ctx(td);
return (db_backtrace(td,
(struct frame *)(ctx->pcb_sp + SPOFF), count));
}