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/*-
* Copyright (c) 2004-2005, Juniper Networks, Inc.
* All rights reserved.
*
* JNPR: db_trace.c,v 1.8 2007/08/09 11:23:32 katta
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/mips/mips/db_trace.c 210096 2010-07-15 01:47:47Z imp $");
#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 <machine/db_machdep.h>
#include <machine/md_var.h>
#include <machine/mips_opcode.h>
#include <machine/pcb.h>
#include <machine/trap.h>
#include <ddb/ddb.h>
#include <ddb/db_sym.h>
extern char _locore[];
extern char _locoreEnd[];
extern char edata[];
/*
* A function using a stack frame has the following instruction as the first
* one: addiu sp,sp,-<frame_size>
*
* We make use of this to detect starting address of a function. This works
* better than using 'j ra' instruction to signify end of the previous
* function (for e.g. functions like boot() or panic() do not actually
* emit a 'j ra' instruction).
*
* XXX the abi does not require that the addiu instruction be the first one.
*/
#define MIPS_START_OF_FUNCTION(ins) (((ins) & 0xffff8000) == 0x27bd8000)
/*
* MIPS ABI 3.0 requires that all functions return using the 'j ra' instruction
*
* XXX gcc doesn't do this for functions with __noreturn__ attribute.
*/
#define MIPS_END_OF_FUNCTION(ins) ((ins) == 0x03e00008)
/*
* kdbpeekD(addr) - skip one word starting at 'addr', then read the second word
*/
#define kdbpeekD(addr) kdbpeek(((int *)(addr)) + 1)
/*
* Functions ``special'' enough to print by name
*/
#ifdef __STDC__
#define Name(_fn) { (void*)_fn, # _fn }
#else
#define Name(_fn) { _fn, "_fn"}
#endif
static struct {
void *addr;
char *name;
} names[] = {
Name(trap),
Name(MipsKernGenException),
Name(MipsUserGenException),
Name(MipsKernIntr),
Name(MipsUserIntr),
Name(cpu_switch),
{
0, 0
}
};
/*
* Map a function address to a string name, if known; or a hex string.
*/
static char *
fn_name(uintptr_t addr)
{
static char buf[17];
int i = 0;
db_expr_t diff;
c_db_sym_t sym;
char *symname;
diff = 0;
symname = NULL;
sym = db_search_symbol((db_addr_t)addr, DB_STGY_ANY, &diff);
db_symbol_values(sym, (const char **)&symname, (db_expr_t *)0);
if (symname && diff == 0)
return (symname);
for (i = 0; names[i].name; i++)
if (names[i].addr == (void *)addr)
return (names[i].name);
sprintf(buf, "%jx", (uintmax_t)addr);
return (buf);
}
void
stacktrace_subr(register_t pc, register_t sp, register_t ra,
int (*printfn) (const char *,...))
{
InstFmt i;
/*
* Arrays for a0..a3 registers and flags if content
* of these registers is valid, e.g. obtained from the stack
*/
int valid_args[4];
uintptr_t args[4];
uintptr_t va, subr;
unsigned instr, mask;
unsigned int frames = 0;
int more, stksize, j;
/* Jump here when done with a frame, to start a new one */
loop:
/*
* Invalidate arguments values
*/
valid_args[0] = 0;
valid_args[1] = 0;
valid_args[2] = 0;
valid_args[3] = 0;
/* Jump here after a nonstandard (interrupt handler) frame */
stksize = 0;
subr = 0;
if (frames++ > 100) {
(*printfn) ("\nstackframe count exceeded\n");
/* return breaks stackframe-size heuristics with gcc -O2 */
goto finish; /* XXX */
}
/* check for bad SP: could foul up next frame */
/*XXX MIPS64 bad: this hard-coded SP is lame */
if (sp & 3 || (uintptr_t)sp < 0x80000000u) {
(*printfn) ("SP 0x%x: not in kernel\n", sp);
ra = 0;
subr = 0;
goto done;
}
#define Between(x, y, z) \
( ((x) <= (y)) && ((y) < (z)) )
#define pcBetween(a,b) \
Between((uintptr_t)a, pc, (uintptr_t)b)
/*
* Check for current PC in exception handler code that don't have a
* preceding "j ra" at the tail of the preceding function. Depends
* on relative ordering of functions in exception.S, swtch.S.
*/
if (pcBetween(MipsKernGenException, MipsUserGenException))
subr = (uintptr_t)MipsKernGenException;
else if (pcBetween(MipsUserGenException, MipsKernIntr))
subr = (uintptr_t)MipsUserGenException;
else if (pcBetween(MipsKernIntr, MipsUserIntr))
subr = (uintptr_t)MipsKernIntr;
else if (pcBetween(MipsUserIntr, MipsTLBInvalidException))
subr = (uintptr_t)MipsUserIntr;
else if (pcBetween(MipsTLBInvalidException, MipsTLBMissException))
subr = (uintptr_t)MipsTLBInvalidException;
else if (pcBetween(fork_trampoline, savectx))
subr = (uintptr_t)fork_trampoline;
else if (pcBetween(savectx, cpu_throw))
subr = (uintptr_t)savectx;
else if (pcBetween(cpu_throw, cpu_switch))
subr = (uintptr_t)cpu_throw;
else if (pcBetween(cpu_switch, MipsSwitchFPState))
subr = (uintptr_t)cpu_switch;
else if (pcBetween(_locore, _locoreEnd)) {
subr = (uintptr_t)_locore;
ra = 0;
goto done;
}
/* check for bad PC */
/*XXX MIPS64 bad: These hard coded constants are lame */
if (pc & 3 || pc < (uintptr_t)0x80000000) {
(*printfn) ("PC 0x%x: not in kernel\n", pc);
ra = 0;
goto done;
}
/*
* Find the beginning of the current subroutine by scanning
* backwards from the current PC for the end of the previous
* subroutine.
*/
if (!subr) {
va = pc - sizeof(int);
while (1) {
instr = kdbpeek((int *)va);
if (MIPS_START_OF_FUNCTION(instr))
break;
if (MIPS_END_OF_FUNCTION(instr)) {
/* skip over branch-delay slot instruction */
va += 2 * sizeof(int);
break;
}
va -= sizeof(int);
}
/* skip over nulls which might separate .o files */
while ((instr = kdbpeek((int *)va)) == 0)
va += sizeof(int);
subr = va;
}
/* scan forwards to find stack size and any saved registers */
stksize = 0;
more = 3;
mask = 0;
for (va = subr; more; va += sizeof(int),
more = (more == 3) ? 3 : more - 1) {
/* stop if hit our current position */
if (va >= pc)
break;
instr = kdbpeek((int *)va);
i.word = instr;
switch (i.JType.op) {
case OP_SPECIAL:
switch (i.RType.func) {
case OP_JR:
case OP_JALR:
more = 2; /* stop after next instruction */
break;
case OP_SYSCALL:
case OP_BREAK:
more = 1; /* stop now */
};
break;
case OP_BCOND:
case OP_J:
case OP_JAL:
case OP_BEQ:
case OP_BNE:
case OP_BLEZ:
case OP_BGTZ:
more = 2; /* stop after next instruction */
break;
case OP_COP0:
case OP_COP1:
case OP_COP2:
case OP_COP3:
switch (i.RType.rs) {
case OP_BCx:
case OP_BCy:
more = 2; /* stop after next instruction */
};
break;
case OP_SW:
/* look for saved registers on the stack */
if (i.IType.rs != 29)
break;
/* only restore the first one */
if (mask & (1 << i.IType.rt))
break;
mask |= (1 << i.IType.rt);
switch (i.IType.rt) {
case 4:/* a0 */
args[0] = kdbpeek((int *)(sp + (short)i.IType.imm));
valid_args[0] = 1;
break;
case 5:/* a1 */
args[1] = kdbpeek((int *)(sp + (short)i.IType.imm));
valid_args[1] = 1;
break;
case 6:/* a2 */
args[2] = kdbpeek((int *)(sp + (short)i.IType.imm));
valid_args[2] = 1;
break;
case 7:/* a3 */
args[3] = kdbpeek((int *)(sp + (short)i.IType.imm));
valid_args[3] = 1;
break;
case 31: /* ra */
ra = kdbpeek((int *)(sp + (short)i.IType.imm));
}
break;
case OP_SD:
/* look for saved registers on the stack */
if (i.IType.rs != 29)
break;
/* only restore the first one */
if (mask & (1 << i.IType.rt))
break;
mask |= (1 << i.IType.rt);
switch (i.IType.rt) {
case 4:/* a0 */
args[0] = kdbpeekD((int *)(sp + (short)i.IType.imm));
valid_args[0] = 1;
break;
case 5:/* a1 */
args[1] = kdbpeekD((int *)(sp + (short)i.IType.imm));
valid_args[1] = 1;
break;
case 6:/* a2 */
args[2] = kdbpeekD((int *)(sp + (short)i.IType.imm));
valid_args[2] = 1;
break;
case 7:/* a3 */
args[3] = kdbpeekD((int *)(sp + (short)i.IType.imm));
valid_args[3] = 1;
break;
case 31: /* ra */
ra = kdbpeekD((int *)(sp + (short)i.IType.imm));
}
break;
case OP_ADDI:
case OP_ADDIU:
/* look for stack pointer adjustment */
if (i.IType.rs != 29 || i.IType.rt != 29)
break;
stksize = -((short)i.IType.imm);
}
}
done:
(*printfn) ("%s+%x (", fn_name(subr), pc - subr);
for (j = 0; j < 4; j ++) {
if (j > 0)
(*printfn)(",");
if (valid_args[j])
(*printfn)("%x", args[j]);
else
(*printfn)("?");
}
(*printfn) (") ra %x sp %x sz %d\n", ra, sp, stksize);
if (ra) {
if (pc == ra && stksize == 0)
(*printfn) ("stacktrace: loop!\n");
else {
pc = ra;
sp += stksize;
ra = 0;
goto loop;
}
} else {
finish:
if (curproc)
(*printfn) ("pid %d\n", curproc->p_pid);
else
(*printfn) ("curproc NULL\n");
}
}
int
db_md_set_watchpoint(db_expr_t addr, db_expr_t size)
{
return(0);
}
int
db_md_clr_watchpoint(db_expr_t addr, db_expr_t size)
{
return(0);
}
void
db_md_list_watchpoints()
{
}
void
db_trace_self(void)
{
db_trace_thread (curthread, -1);
return;
}
int
db_trace_thread(struct thread *thr, int count)
{
register_t pc, ra, sp;
struct pcb *ctx;
if (thr == curthread) {
sp = (register_t)(intptr_t)__builtin_frame_address(0);
ra = (register_t)(intptr_t)__builtin_return_address(0);
__asm __volatile(
"jal 99f\n"
"nop\n"
"99:\n"
"move %0, $31\n" /* get ra */
"move $31, %1\n" /* restore ra */
: "=r" (pc)
: "r" (ra));
} else {
ctx = kdb_thr_ctx(thr);
sp = (register_t)ctx->pcb_context[PREG_SP];
pc = (register_t)ctx->pcb_context[PREG_PC];
ra = (register_t)ctx->pcb_context[PREG_RA];
}
stacktrace_subr(pc, sp, ra,
(int (*) (const char *, ...))db_printf);
return (0);
}
void
db_show_mdpcpu(struct pcpu *pc)
{
db_printf("ipis = 0x%x\n", pc->pc_pending_ipis);
db_printf("next ASID = %d\n", pc->pc_next_asid);
db_printf("GENID = %d\n", pc->pc_asid_generation);
return;
}