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freebsd-nq/sys/ia64/ia64/db_machdep.c
Robert Watson 3c90d1ea74 Break out stack(9) from ddb(4): 
- Introduce per-architecture stack_machdep.c to hold stack_save(9).
- Introduce per-architecture machine/stack.h to capture any common
  definitions required between db_trace.c and stack_machdep.c.
- Add new kernel option "options STACK"; we will build in stack(9) if it is
  defined, or also if "options DDB" is defined to provide compatibility
  with existing users of stack(9).

Add new stack_save_td(9) function, which allows the capture of a stacktrace
of another thread rather than the current thread, which the existing
stack_save(9) was limited to.  It requires that the thread be neither
swapped out nor running, which is the responsibility of the consumer to
enforce.

Update stack(9) man page.

Build tested:	amd64, arm, i386, ia64, powerpc, sparc64, sun4v
Runtime tested:	amd64 (rwatson), arm (cognet), i386 (rwatson)
2007-12-02 20:40:35 +00:00

625 lines
16 KiB
C
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/*-
* Copyright (c) 2003-2005 Marcel Moolenaar
* Copyright (c) 2000-2001 Doug Rabson
* 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("$FreeBSD$");
#include <opt_xtrace.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/cons.h>
#include <sys/kdb.h>
#include <sys/ktr.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <sys/smp.h>
#include <sys/stack.h>
#include <vm/vm.h>
#include <machine/db_machdep.h>
#include <machine/frame.h>
#include <machine/kdb.h>
#include <machine/md_var.h>
#include <machine/mutex.h>
#include <machine/pcb.h>
#include <machine/setjmp.h>
#include <machine/unwind.h>
#include <machine/vmparam.h>
#include <ddb/ddb.h>
#include <ddb/db_access.h>
#include <ddb/db_output.h>
#include <ddb/db_sym.h>
#include <ddb/db_variables.h>
#include <ia64/disasm/disasm.h>
#define TMPL_BITS 5
#define TMPL_MASK ((1 << TMPL_BITS) - 1)
#define SLOT_BITS 41
#define SLOT_COUNT 3
#define SLOT_MASK ((1ULL << SLOT_BITS) - 1ULL)
#define SLOT_SHIFT(i) (TMPL_BITS+((i)<<3)+(i))
typedef db_expr_t __db_f(db_expr_t, db_expr_t, db_expr_t, db_expr_t, db_expr_t,
db_expr_t, db_expr_t, db_expr_t);
register uint64_t __db_gp __asm__("gp");
static db_varfcn_t db_frame;
static db_varfcn_t db_getip;
static db_varfcn_t db_getrse;
#define DB_OFFSET(x) (db_expr_t *)offsetof(struct trapframe, x)
struct db_variable db_regs[] = {
{"ip", NULL, db_getip},
{"cr.ifs", DB_OFFSET(tf_special.cfm), db_frame},
{"cr.ifa", DB_OFFSET(tf_special.ifa), db_frame},
{"ar.bspstore", DB_OFFSET(tf_special.bspstore), db_frame},
{"ndirty", DB_OFFSET(tf_special.ndirty), db_frame},
{"rp", DB_OFFSET(tf_special.rp), db_frame},
{"ar.pfs", DB_OFFSET(tf_special.pfs), db_frame},
{"psr", DB_OFFSET(tf_special.psr), db_frame},
{"cr.isr", DB_OFFSET(tf_special.isr), db_frame},
{"pr", DB_OFFSET(tf_special.pr), db_frame},
{"ar.rsc", DB_OFFSET(tf_special.rsc), db_frame},
{"ar.rnat", DB_OFFSET(tf_special.rnat), db_frame},
{"ar.unat", DB_OFFSET(tf_special.unat), db_frame},
{"ar.fpsr", DB_OFFSET(tf_special.fpsr), db_frame},
{"gp", DB_OFFSET(tf_special.gp), db_frame},
{"sp", DB_OFFSET(tf_special.sp), db_frame},
{"tp", DB_OFFSET(tf_special.tp), db_frame},
{"b6", DB_OFFSET(tf_scratch.br6), db_frame},
{"b7", DB_OFFSET(tf_scratch.br7), db_frame},
{"r2", DB_OFFSET(tf_scratch.gr2), db_frame},
{"r3", DB_OFFSET(tf_scratch.gr3), db_frame},
{"r8", DB_OFFSET(tf_scratch.gr8), db_frame},
{"r9", DB_OFFSET(tf_scratch.gr9), db_frame},
{"r10", DB_OFFSET(tf_scratch.gr10), db_frame},
{"r11", DB_OFFSET(tf_scratch.gr11), db_frame},
{"r14", DB_OFFSET(tf_scratch.gr14), db_frame},
{"r15", DB_OFFSET(tf_scratch.gr15), db_frame},
{"r16", DB_OFFSET(tf_scratch.gr16), db_frame},
{"r17", DB_OFFSET(tf_scratch.gr17), db_frame},
{"r18", DB_OFFSET(tf_scratch.gr18), db_frame},
{"r19", DB_OFFSET(tf_scratch.gr19), db_frame},
{"r20", DB_OFFSET(tf_scratch.gr20), db_frame},
{"r21", DB_OFFSET(tf_scratch.gr21), db_frame},
{"r22", DB_OFFSET(tf_scratch.gr22), db_frame},
{"r23", DB_OFFSET(tf_scratch.gr23), db_frame},
{"r24", DB_OFFSET(tf_scratch.gr24), db_frame},
{"r25", DB_OFFSET(tf_scratch.gr25), db_frame},
{"r26", DB_OFFSET(tf_scratch.gr26), db_frame},
{"r27", DB_OFFSET(tf_scratch.gr27), db_frame},
{"r28", DB_OFFSET(tf_scratch.gr28), db_frame},
{"r29", DB_OFFSET(tf_scratch.gr29), db_frame},
{"r30", DB_OFFSET(tf_scratch.gr30), db_frame},
{"r31", DB_OFFSET(tf_scratch.gr31), db_frame},
{"r32", (db_expr_t*)0, db_getrse},
{"r33", (db_expr_t*)1, db_getrse},
{"r34", (db_expr_t*)2, db_getrse},
{"r35", (db_expr_t*)3, db_getrse},
{"r36", (db_expr_t*)4, db_getrse},
{"r37", (db_expr_t*)5, db_getrse},
{"r38", (db_expr_t*)6, db_getrse},
{"r39", (db_expr_t*)7, db_getrse},
{"r40", (db_expr_t*)8, db_getrse},
{"r41", (db_expr_t*)9, db_getrse},
{"r42", (db_expr_t*)10, db_getrse},
{"r43", (db_expr_t*)11, db_getrse},
{"r44", (db_expr_t*)12, db_getrse},
{"r45", (db_expr_t*)13, db_getrse},
{"r46", (db_expr_t*)14, db_getrse},
{"r47", (db_expr_t*)15, db_getrse},
{"r48", (db_expr_t*)16, db_getrse},
{"r49", (db_expr_t*)17, db_getrse},
{"r50", (db_expr_t*)18, db_getrse},
{"r51", (db_expr_t*)19, db_getrse},
{"r52", (db_expr_t*)20, db_getrse},
{"r53", (db_expr_t*)21, db_getrse},
{"r54", (db_expr_t*)22, db_getrse},
{"r55", (db_expr_t*)23, db_getrse},
{"r56", (db_expr_t*)24, db_getrse},
{"r57", (db_expr_t*)25, db_getrse},
{"r58", (db_expr_t*)26, db_getrse},
{"r59", (db_expr_t*)27, db_getrse},
{"r60", (db_expr_t*)28, db_getrse},
{"r61", (db_expr_t*)29, db_getrse},
{"r62", (db_expr_t*)30, db_getrse},
{"r63", (db_expr_t*)31, db_getrse},
{"r64", (db_expr_t*)32, db_getrse},
{"r65", (db_expr_t*)33, db_getrse},
{"r66", (db_expr_t*)34, db_getrse},
{"r67", (db_expr_t*)35, db_getrse},
{"r68", (db_expr_t*)36, db_getrse},
{"r69", (db_expr_t*)37, db_getrse},
{"r70", (db_expr_t*)38, db_getrse},
{"r71", (db_expr_t*)39, db_getrse},
{"r72", (db_expr_t*)40, db_getrse},
{"r73", (db_expr_t*)41, db_getrse},
{"r74", (db_expr_t*)42, db_getrse},
{"r75", (db_expr_t*)43, db_getrse},
{"r76", (db_expr_t*)44, db_getrse},
{"r77", (db_expr_t*)45, db_getrse},
{"r78", (db_expr_t*)46, db_getrse},
{"r79", (db_expr_t*)47, db_getrse},
{"r80", (db_expr_t*)48, db_getrse},
{"r81", (db_expr_t*)49, db_getrse},
{"r82", (db_expr_t*)50, db_getrse},
{"r83", (db_expr_t*)51, db_getrse},
{"r84", (db_expr_t*)52, db_getrse},
{"r85", (db_expr_t*)53, db_getrse},
{"r86", (db_expr_t*)54, db_getrse},
{"r87", (db_expr_t*)55, db_getrse},
{"r88", (db_expr_t*)56, db_getrse},
{"r89", (db_expr_t*)57, db_getrse},
{"r90", (db_expr_t*)58, db_getrse},
{"r91", (db_expr_t*)59, db_getrse},
{"r92", (db_expr_t*)60, db_getrse},
{"r93", (db_expr_t*)61, db_getrse},
{"r94", (db_expr_t*)62, db_getrse},
{"r95", (db_expr_t*)63, db_getrse},
{"r96", (db_expr_t*)64, db_getrse},
{"r97", (db_expr_t*)65, db_getrse},
{"r98", (db_expr_t*)66, db_getrse},
{"r99", (db_expr_t*)67, db_getrse},
{"r100", (db_expr_t*)68, db_getrse},
{"r101", (db_expr_t*)69, db_getrse},
{"r102", (db_expr_t*)70, db_getrse},
{"r103", (db_expr_t*)71, db_getrse},
{"r104", (db_expr_t*)72, db_getrse},
{"r105", (db_expr_t*)73, db_getrse},
{"r106", (db_expr_t*)74, db_getrse},
{"r107", (db_expr_t*)75, db_getrse},
{"r108", (db_expr_t*)76, db_getrse},
{"r109", (db_expr_t*)77, db_getrse},
{"r110", (db_expr_t*)78, db_getrse},
{"r111", (db_expr_t*)79, db_getrse},
{"r112", (db_expr_t*)80, db_getrse},
{"r113", (db_expr_t*)81, db_getrse},
{"r114", (db_expr_t*)82, db_getrse},
{"r115", (db_expr_t*)83, db_getrse},
{"r116", (db_expr_t*)84, db_getrse},
{"r117", (db_expr_t*)85, db_getrse},
{"r118", (db_expr_t*)86, db_getrse},
{"r119", (db_expr_t*)87, db_getrse},
{"r120", (db_expr_t*)88, db_getrse},
{"r121", (db_expr_t*)89, db_getrse},
{"r122", (db_expr_t*)90, db_getrse},
{"r123", (db_expr_t*)91, db_getrse},
{"r124", (db_expr_t*)92, db_getrse},
{"r125", (db_expr_t*)93, db_getrse},
{"r126", (db_expr_t*)94, db_getrse},
{"r127", (db_expr_t*)95, db_getrse},
};
struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]);
static int
db_backtrace(struct thread *td, struct pcb *pcb, int count)
{
struct unw_regstate rs;
struct trapframe *tf;
const char *name;
db_expr_t offset;
uint64_t bsp, cfm, ip, pfs, reg, sp;
c_db_sym_t sym;
int args, error, i;
error = unw_create_from_pcb(&rs, pcb);
while (!error && count-- && !db_pager_quit) {
error = unw_get_cfm(&rs, &cfm);
if (!error)
error = unw_get_bsp(&rs, &bsp);
if (!error)
error = unw_get_ip(&rs, &ip);
if (!error)
error = unw_get_sp(&rs, &sp);
if (error)
break;
args = IA64_CFM_SOL(cfm);
if (args > 8)
args = 8;
error = unw_step(&rs);
if (!error) {
if (!unw_get_cfm(&rs, &pfs)) {
i = IA64_CFM_SOF(pfs) - IA64_CFM_SOL(pfs);
if (args > i)
args = i;
}
}
sym = db_search_symbol(ip, DB_STGY_ANY, &offset);
db_symbol_values(sym, &name, NULL);
db_printf("%s(", name);
if (bsp >= IA64_RR_BASE(5)) {
for (i = 0; i < args; i++) {
if ((bsp & 0x1ff) == 0x1f8)
bsp += 8;
db_read_bytes(bsp, sizeof(reg), (void*)&reg);
if (i > 0)
db_printf(", ");
db_printf("0x%lx", reg);
bsp += 8;
}
} else
db_printf("...");
db_printf(") at ");
db_printsym(ip, DB_STGY_PROC);
db_printf("\n");
if (error != ERESTART)
continue;
if (sp < IA64_RR_BASE(5))
break;
tf = (struct trapframe *)(sp + 16);
if ((tf->tf_flags & FRAME_SYSCALL) != 0 ||
tf->tf_special.iip < IA64_RR_BASE(5))
break;
/* XXX ask if we should unwind across the trapframe. */
db_printf("--- trapframe at %p\n", tf);
unw_delete(&rs);
error = unw_create_from_frame(&rs, tf);
}
unw_delete(&rs);
/*
* EJUSTRETURN and ERESTART signal the end of a trace and
* are not really errors.
*/
return ((error > 0) ? error : 0);
}
void
db_bkpt_clear(db_addr_t addr, BKPT_INST_TYPE *storage)
{
BKPT_INST_TYPE tmp;
db_addr_t loc;
int slot;
slot = addr & 0xfUL;
if (slot >= SLOT_COUNT)
return;
loc = (addr & ~0xfUL) + (slot << 2);
db_read_bytes(loc, sizeof(BKPT_INST_TYPE), (char *)&tmp);
tmp &= ~(SLOT_MASK << SLOT_SHIFT(slot));
tmp |= *storage << SLOT_SHIFT(slot);
db_write_bytes(loc, sizeof(BKPT_INST_TYPE), (char *)&tmp);
}
void
db_bkpt_skip(void)
{
if (kdb_frame == NULL)
return;
kdb_frame->tf_special.psr += IA64_PSR_RI_1;
if ((kdb_frame->tf_special.psr & IA64_PSR_RI) > IA64_PSR_RI_2) {
kdb_frame->tf_special.psr &= ~IA64_PSR_RI;
kdb_frame->tf_special.iip += 16;
}
}
void
db_bkpt_write(db_addr_t addr, BKPT_INST_TYPE *storage)
{
BKPT_INST_TYPE tmp;
db_addr_t loc;
int slot;
slot = addr & 0xfUL;
if (slot >= SLOT_COUNT)
return;
loc = (addr & ~0xfUL) + (slot << 2);
db_read_bytes(loc, sizeof(BKPT_INST_TYPE), (char *)&tmp);
*storage = (tmp >> SLOT_SHIFT(slot)) & SLOT_MASK;
tmp &= ~(SLOT_MASK << SLOT_SHIFT(slot));
tmp |= (0x84000 << 6) << SLOT_SHIFT(slot);
db_write_bytes(loc, sizeof(BKPT_INST_TYPE), (char *)&tmp);
}
db_addr_t
db_disasm(db_addr_t loc, boolean_t altfmt)
{
char buf[32];
struct asm_bundle bundle;
const struct asm_inst *i;
const char *tmpl;
int n, slot;
slot = loc & 0xf;
loc &= ~0xful;
db_read_bytes(loc, 16, buf);
if (asm_decode((uintptr_t)buf, &bundle)) {
i = bundle.b_inst + slot;
tmpl = bundle.b_templ + slot;
if (*tmpl == ';' || (slot == 2 && bundle.b_templ[1] == ';'))
tmpl++;
if (*tmpl == 'L' || i->i_op == ASM_OP_NONE) {
db_printf("\n");
goto out;
}
/* Unit + slot. */
db_printf("[%c%d] ", *tmpl, slot);
/* Predicate. */
if (i->i_oper[0].o_value != 0) {
asm_operand(i->i_oper+0, buf, loc);
db_printf("(%s) ", buf);
} else
db_printf(" ");
/* Mnemonic & completers. */
asm_mnemonic(i->i_op, buf);
db_printf(buf);
n = 0;
while (n < i->i_ncmpltrs) {
asm_completer(i->i_cmpltr + n, buf);
db_printf(buf);
n++;
}
db_printf(" ");
/* Operands. */
n = 1;
while (n < 7 && i->i_oper[n].o_type != ASM_OPER_NONE) {
if (n > 1) {
if (n == i->i_srcidx)
db_printf("=");
else
db_printf(",");
}
asm_operand(i->i_oper + n, buf, loc);
db_printf(buf);
n++;
}
if (tmpl[1] == ';')
db_printf(" ;;");
} else {
tmpl = NULL;
slot = 2;
}
db_printf("\n");
out:
slot++;
if (slot == 1 && tmpl[1] == 'L')
slot++;
if (slot > 2)
slot = 16;
return (loc + slot);
}
int
db_fncall_ia64(db_expr_t addr, db_expr_t *rv, int nargs, db_expr_t args[])
{
struct ia64_fdesc fdesc;
__db_f *f;
f = (__db_f *)&fdesc;
fdesc.func = addr;
fdesc.gp = __db_gp; /* XXX doesn't work for modules. */
*rv = (*f)(args[0], args[1], args[2], args[3], args[4], args[5],
args[6], args[7]);
return (1);
}
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);
}
static int
db_getip(struct db_variable *vp, db_expr_t *valuep, int op)
{
u_long iip, slot;
if (kdb_frame == NULL)
return (0);
if (op == DB_VAR_GET) {
iip = kdb_frame->tf_special.iip;
slot = (kdb_frame->tf_special.psr >> 41) & 3;
*valuep = iip + slot;
} else {
iip = *valuep & ~0xf;
slot = *valuep & 0xf;
if (slot > 2)
return (0);
kdb_frame->tf_special.iip = iip;
kdb_frame->tf_special.psr &= ~IA64_PSR_RI;
kdb_frame->tf_special.psr |= slot << 41;
}
return (1);
}
static int
db_getrse(struct db_variable *vp, db_expr_t *valuep, int op)
{
u_int64_t *reg;
uint64_t bsp;
int nats, regno, sof;
if (kdb_frame == NULL)
return (0);
regno = (int)(intptr_t)valuep;
bsp = kdb_frame->tf_special.bspstore + kdb_frame->tf_special.ndirty;
sof = (int)(kdb_frame->tf_special.cfm & 0x7f);
if (regno >= sof)
return (0);
nats = (sof - regno + 63 - ((int)(bsp >> 3) & 0x3f)) / 63;
reg = (void*)(bsp - ((sof - regno + nats) << 3));
if (op == DB_VAR_GET)
*valuep = *reg;
else
*reg = *valuep;
return (1);
}
int
db_md_clr_watchpoint(db_expr_t addr, db_expr_t size)
{
return (-1);
}
void
db_md_list_watchpoints()
{
return;
}
int
db_md_set_watchpoint(db_expr_t addr, db_expr_t size)
{
return (-1);
}
/*
* Read bytes from kernel address space for debugger.
*/
int
db_read_bytes(vm_offset_t addr, size_t size, char *data)
{
jmp_buf jb;
void *prev_jb;
char *src;
int ret;
prev_jb = kdb_jmpbuf(jb);
ret = setjmp(jb);
if (ret == 0) {
src = (char *)addr;
while (size-- > 0)
*data++ = *src++;
}
(void)kdb_jmpbuf(prev_jb);
return (ret);
}
/*
* Write bytes to kernel address space for debugger.
*/
int
db_write_bytes(vm_offset_t addr, size_t size, char *data)
{
jmp_buf jb;
void *prev_jb;
size_t cnt;
char *dst;
int ret;
prev_jb = kdb_jmpbuf(jb);
ret = setjmp(jb);
if (ret == 0) {
dst = (char *)addr;
cnt = size;
while (cnt-- > 0)
*dst++ = *data++;
kdb_cpu_sync_icache((void *)addr, size);
}
(void)kdb_jmpbuf(prev_jb);
return (ret);
}
void
db_show_mdpcpu(struct pcpu *pc)
{
}
void
db_trace_self(void)
{
struct pcb pcb;
savectx(&pcb);
db_backtrace(curthread, &pcb, -1);
}
int
db_trace_thread(struct thread *td, int count)
{
struct pcb *ctx;
ctx = kdb_thr_ctx(td);
return (db_backtrace(td, ctx, count));
}
#ifdef EXCEPTION_TRACING
extern long xtrace[];
extern long *xhead;
DB_COMMAND(xtrace, db_xtrace)
{
long *p;
p = (*xhead == 0) ? xtrace : xhead;
db_printf("ITC\t\t IVT\t\t IIP\t\t IFA\t\t ISR\n");
if (*p == 0)
return;
do {
db_printf("%016lx %016lx %016lx %016lx %016lx\n", p[0], p[1],
p[2], p[3], p[4]);
p += 5;
if (p == (void *)&xhead)
p = xtrace;
} while (p != xhead);
}
#endif
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