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/* $FreeBSD: release/9.1.0/sys/powerpc/powerpc/db_trace.c 223470 2011-06-23 09:43:53Z andreast $ */
/* $NetBSD: db_trace.c,v 1.20 2002/05/13 20:30:09 matt Exp $ */
/* $OpenBSD: db_trace.c,v 1.3 1997/03/21 02:10:48 niklas Exp $ */
/*-
* Mach Operating System
* Copyright (c) 1992 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kdb.h>
#include <sys/proc.h>
#include <sys/stack.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_extern.h>
#include <machine/db_machdep.h>
#include <machine/pcb.h>
#include <machine/spr.h>
#include <machine/stack.h>
#include <machine/trap.h>
#include <ddb/ddb.h>
#include <ddb/db_access.h>
#include <ddb/db_sym.h>
#include <ddb/db_variables.h>
static db_varfcn_t db_frame;
#define DB_OFFSET(x) (db_expr_t *)offsetof(struct trapframe, x)
#ifdef __powerpc64__
#define CALLOFFSET 8 /* Include TOC reload slot */
#else
#define CALLOFFSET 4
#endif
struct db_variable db_regs[] = {
{ "r0", DB_OFFSET(fixreg[0]), db_frame },
{ "r1", DB_OFFSET(fixreg[1]), db_frame },
{ "r2", DB_OFFSET(fixreg[2]), db_frame },
{ "r3", DB_OFFSET(fixreg[3]), db_frame },
{ "r4", DB_OFFSET(fixreg[4]), db_frame },
{ "r5", DB_OFFSET(fixreg[5]), db_frame },
{ "r6", DB_OFFSET(fixreg[6]), db_frame },
{ "r7", DB_OFFSET(fixreg[7]), db_frame },
{ "r8", DB_OFFSET(fixreg[8]), db_frame },
{ "r9", DB_OFFSET(fixreg[9]), db_frame },
{ "r10", DB_OFFSET(fixreg[10]), db_frame },
{ "r11", DB_OFFSET(fixreg[11]), db_frame },
{ "r12", DB_OFFSET(fixreg[12]), db_frame },
{ "r13", DB_OFFSET(fixreg[13]), db_frame },
{ "r14", DB_OFFSET(fixreg[14]), db_frame },
{ "r15", DB_OFFSET(fixreg[15]), db_frame },
{ "r16", DB_OFFSET(fixreg[16]), db_frame },
{ "r17", DB_OFFSET(fixreg[17]), db_frame },
{ "r18", DB_OFFSET(fixreg[18]), db_frame },
{ "r19", DB_OFFSET(fixreg[19]), db_frame },
{ "r20", DB_OFFSET(fixreg[20]), db_frame },
{ "r21", DB_OFFSET(fixreg[21]), db_frame },
{ "r22", DB_OFFSET(fixreg[22]), db_frame },
{ "r23", DB_OFFSET(fixreg[23]), db_frame },
{ "r24", DB_OFFSET(fixreg[24]), db_frame },
{ "r25", DB_OFFSET(fixreg[25]), db_frame },
{ "r26", DB_OFFSET(fixreg[26]), db_frame },
{ "r27", DB_OFFSET(fixreg[27]), db_frame },
{ "r28", DB_OFFSET(fixreg[28]), db_frame },
{ "r29", DB_OFFSET(fixreg[29]), db_frame },
{ "r30", DB_OFFSET(fixreg[30]), db_frame },
{ "r31", DB_OFFSET(fixreg[31]), db_frame },
{ "srr0", DB_OFFSET(srr0), db_frame },
{ "srr1", DB_OFFSET(srr1), db_frame },
{ "lr", DB_OFFSET(lr), db_frame },
{ "ctr", DB_OFFSET(ctr), db_frame },
{ "cr", DB_OFFSET(cr), db_frame },
{ "xer", DB_OFFSET(xer), db_frame },
#ifdef AIM
{ "dar", DB_OFFSET(cpu.aim.dar), db_frame },
{ "dsisr", DB_OFFSET(cpu.aim.dsisr), db_frame },
#endif
#ifdef E500
{ "dear", DB_OFFSET(cpu.booke.dear), db_frame },
{ "esr", DB_OFFSET(cpu.booke.esr), db_frame },
#endif
};
struct db_variable *db_eregs = db_regs + sizeof (db_regs)/sizeof (db_regs[0]);
/*
* register variable handling
*/
static int
db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
{
register_t *reg;
if (kdb_frame == NULL)
return (0);
reg = (register_t*)((uintptr_t)kdb_frame + (uintptr_t)vp->valuep);
if (op == DB_VAR_GET)
*valuep = *reg;
else
*reg = *valuep;
return (1);
}
/*
* Frame tracing.
*/
static int
db_backtrace(struct thread *td, db_addr_t fp, int count)
{
db_addr_t stackframe, lr, *args;
db_expr_t diff;
c_db_sym_t sym;
const char *symname;
boolean_t kernel_only = TRUE;
boolean_t full = FALSE;
#if 0
{
register char *cp = modif;
register char c;
while ((c = *cp++) != 0) {
if (c == 't')
trace_thread = TRUE;
if (c == 'u')
kernel_only = FALSE;
if (c == 'f')
full = TRUE;
}
}
#endif
stackframe = fp;
while (!db_pager_quit) {
if (stackframe < PAGE_SIZE)
break;
/*
* Locate the next frame by grabbing the backchain ptr
* from frame[0]
*/
stackframe = *(db_addr_t *)stackframe;
next_frame:
#ifdef __powerpc64__
/* The saved arg values start at frame[6] */
args = (db_addr_t *)(stackframe + 48);
#else
/* The saved arg values start at frame[2] */
args = (db_addr_t *)(stackframe + 8);
#endif
if (stackframe < PAGE_SIZE)
break;
if (count-- == 0)
break;
/*
* Extract link register from frame and subtract
* 4 to convert into calling address (as opposed to
* return address)
*/
#ifdef __powerpc64__
lr = *(db_addr_t *)(stackframe + 16) - 4;
#else
lr = *(db_addr_t *)(stackframe + 4) - 4;
#endif
if ((lr & 3) || (lr < 0x100)) {
db_printf("saved LR(0x%zx) is invalid.", lr);
break;
}
#ifdef __powerpc64__
db_printf("0x%016lx: ", stackframe);
#else
db_printf("0x%08x: ", stackframe);
#endif
/*
* The trap code labels the return addresses from the
* call to C code as 'trapexit' and 'asttrapexit. Use this
* to determine if the callframe has to traverse a saved
* trap context
*/
if ((lr + CALLOFFSET == (db_addr_t) &trapexit) ||
(lr + CALLOFFSET == (db_addr_t) &asttrapexit)) {
const char *trapstr;
struct trapframe *tf = (struct trapframe *)(args);
db_printf("%s ", tf->srr1 & PSL_PR ? "user" : "kernel");
switch (tf->exc) {
case EXC_DSI:
/* XXX take advantage of the union. */
db_printf("DSI %s trap @ %#zx by ",
(tf->cpu.aim.dsisr & DSISR_STORE) ? "write"
: "read", tf->cpu.aim.dar);
goto print_trap;
case EXC_ALI:
/* XXX take advantage of the union. */
db_printf("ALI trap @ %#zx (xSR %#x) ",
tf->cpu.aim.dar,
(uint32_t)tf->cpu.aim.dsisr);
goto print_trap;
#ifdef __powerpc64__
case EXC_DSE:
db_printf("DSE trap @ %#zx by ",
tf->cpu.aim.dar);
goto print_trap;
case EXC_ISE:
db_printf("ISE trap @ %#zx by ", tf->srr0);
goto print_trap;
#endif
case EXC_ISI: trapstr = "ISI"; break;
case EXC_PGM: trapstr = "PGM"; break;
case EXC_SC: trapstr = "SC"; break;
case EXC_EXI: trapstr = "EXI"; break;
case EXC_MCHK: trapstr = "MCHK"; break;
#ifndef E500
case EXC_VEC: trapstr = "VEC"; break;
case EXC_FPA: trapstr = "FPA"; break;
case EXC_BPT: trapstr = "BPT"; break;
case EXC_TRC: trapstr = "TRC"; break;
case EXC_RUNMODETRC: trapstr = "RUNMODETRC"; break;
case EXC_SMI: trapstr = "SMI"; break;
case EXC_RST: trapstr = "RST"; break;
#endif
case EXC_FPU: trapstr = "FPU"; break;
case EXC_DECR: trapstr = "DECR"; break;
case EXC_PERF: trapstr = "PERF"; break;
default: trapstr = NULL; break;
}
if (trapstr != NULL) {
db_printf("%s trap by ", trapstr);
} else {
db_printf("trap %#zx by ", tf->exc);
}
print_trap:
lr = (db_addr_t) tf->srr0;
diff = 0;
symname = NULL;
sym = db_search_symbol(lr, DB_STGY_ANY, &diff);
db_symbol_values(sym, &symname, 0);
if (symname == NULL || !strcmp(symname, "end")) {
db_printf("%#zx: srr1=%#zx\n", lr, tf->srr1);
} else {
db_printf("%s+%#zx: srr1=%#zx\n", symname, diff,
tf->srr1);
}
db_printf("%-10s r1=%#zx cr=%#x xer=%#x ctr=%#zx",
"", tf->fixreg[1], (uint32_t)tf->cr,
(uint32_t)tf->xer, tf->ctr);
if (tf->exc == EXC_DSI)
db_printf(" sr=%#x",
(uint32_t)tf->cpu.aim.dsisr);
db_printf("\n");
stackframe = (db_addr_t) tf->fixreg[1];
if (kernel_only && (tf->srr1 & PSL_PR))
break;
goto next_frame;
}
diff = 0;
symname = NULL;
sym = db_search_symbol(lr, DB_STGY_ANY, &diff);
db_symbol_values(sym, &symname, 0);
if (symname == NULL || !strcmp(symname, "end"))
db_printf("at %zx", lr);
else
db_printf("at %s+%#zx", symname, diff);
if (full)
/* Print all the args stored in that stackframe. */
db_printf("(%zx, %zx, %zx, %zx, %zx, %zx, %zx, %zx)",
args[0], args[1], args[2], args[3],
args[4], args[5], args[6], args[7]);
db_printf("\n");
}
return (0);
}
void
db_trace_self(void)
{
db_addr_t addr;
addr = (db_addr_t)__builtin_frame_address(1);
db_backtrace(curthread, addr, -1);
}
int
db_trace_thread(struct thread *td, int count)
{
struct pcb *ctx;
ctx = kdb_thr_ctx(td);
return (db_backtrace(td, (db_addr_t)ctx->pcb_sp, count));
}