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/* $OpenBSD: db_trace.c,v 1.14 2019/11/07 16:08:08 mpi Exp $ */
/* $NetBSD: db_trace.c,v 1.15 1996/02/22 23:23:41 gwr 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/proc.h>
#include <sys/user.h>
#include <uvm/uvm_extern.h>
#include <machine/db_machdep.h>
#include <machine/signal.h>
#include <machine/pcb.h>
#include <machine/pmap.h>
#include <ddb/db_access.h>
#include <ddb/db_sym.h>
#include <ddb/db_variables.h>
#include <ddb/db_interface.h>
#include <ddb/db_output.h>
db_regs_t ddb_regs;
struct db_variable db_regs[] = {
{ "r0", (long *)&ddb_regs.fixreg[0], FCN_NULL },
{ "r1", (long *)&ddb_regs.fixreg[1], FCN_NULL },
{ "r2", (long *)&ddb_regs.fixreg[2], FCN_NULL },
{ "r3", (long *)&ddb_regs.fixreg[3], FCN_NULL },
{ "r4", (long *)&ddb_regs.fixreg[4], FCN_NULL },
{ "r5", (long *)&ddb_regs.fixreg[5], FCN_NULL },
{ "r6", (long *)&ddb_regs.fixreg[6], FCN_NULL },
{ "r7", (long *)&ddb_regs.fixreg[7], FCN_NULL },
{ "r8", (long *)&ddb_regs.fixreg[8], FCN_NULL },
{ "r9", (long *)&ddb_regs.fixreg[9], FCN_NULL },
{ "r10", (long *)&ddb_regs.fixreg[10], FCN_NULL },
{ "r11", (long *)&ddb_regs.fixreg[11], FCN_NULL },
{ "r12", (long *)&ddb_regs.fixreg[12], FCN_NULL },
{ "r13", (long *)&ddb_regs.fixreg[13], FCN_NULL },
{ "r14", (long *)&ddb_regs.fixreg[13], FCN_NULL },
{ "r15", (long *)&ddb_regs.fixreg[13], FCN_NULL },
{ "r16", (long *)&ddb_regs.fixreg[13], FCN_NULL },
{ "r17", (long *)&ddb_regs.fixreg[17], FCN_NULL },
{ "r18", (long *)&ddb_regs.fixreg[18], FCN_NULL },
{ "r19", (long *)&ddb_regs.fixreg[19], FCN_NULL },
{ "r20", (long *)&ddb_regs.fixreg[20], FCN_NULL },
{ "r21", (long *)&ddb_regs.fixreg[21], FCN_NULL },
{ "r22", (long *)&ddb_regs.fixreg[22], FCN_NULL },
{ "r23", (long *)&ddb_regs.fixreg[23], FCN_NULL },
{ "r24", (long *)&ddb_regs.fixreg[24], FCN_NULL },
{ "r25", (long *)&ddb_regs.fixreg[25], FCN_NULL },
{ "r26", (long *)&ddb_regs.fixreg[26], FCN_NULL },
{ "r27", (long *)&ddb_regs.fixreg[27], FCN_NULL },
{ "r28", (long *)&ddb_regs.fixreg[28], FCN_NULL },
{ "r29", (long *)&ddb_regs.fixreg[29], FCN_NULL },
{ "r30", (long *)&ddb_regs.fixreg[30], FCN_NULL },
{ "r31", (long *)&ddb_regs.fixreg[31], FCN_NULL },
{ "lr", (long *)&ddb_regs.lr, FCN_NULL },
{ "cr", (long *)&ddb_regs.cr, FCN_NULL },
{ "xer", (long *)&ddb_regs.xer, FCN_NULL },
{ "ctr", (long *)&ddb_regs.ctr, FCN_NULL },
{ "iar", (long *)&ddb_regs.srr0, FCN_NULL },
{ "msr", (long *)&ddb_regs.srr1, FCN_NULL },
};
struct db_variable *db_eregs = db_regs + nitems(db_regs);
/*
* this is probably hackery.
*/
void
db_save_regs(struct trapframe *frame)
{
bcopy(frame, &ddb_regs, sizeof (struct trapframe));
}
/* from locore.S */
extern vaddr_t trapexit;
extern vaddr_t esym;
#define INTSTK (8*1024) /* 8K interrupt stack */
#define INKERNEL(va) (((vaddr_t)(va)) >= VM_MIN_KERNEL_ADDRESS && \
((vaddr_t)(va)) < VM_MAX_KERNEL_ADDRESS)
#define ININTSTK(va) (((vaddr_t)(va)) >= round_page(esym) && \
((vaddr_t)(va)) < (round_page(esym) + INTSTK))
/*
* Frame tracing.
*/
void
db_stack_trace_print(db_expr_t addr, int have_addr, db_expr_t count,
char *modif, int (*pr)(const char *, ...))
{
vaddr_t lr, sp, lastsp, *db_fp_args;
db_expr_t offset;
Elf_Sym *sym;
char *name;
char c, *cp = modif;
int i, narg, trace_proc = 0;
while ((c = *cp++) != 0) {
if (c == 'p')
trace_proc = 1;
}
if (!have_addr) {
sp = ddb_regs.fixreg[1];
lr = ddb_regs.srr0;
} else {
if (trace_proc) {
struct proc *p = tfind((pid_t)addr);
if (p == NULL) {
(*pr) ("not found\n");
return;
}
addr = p->p_addr->u_pcb.pcb_sp;
}
sp = addr;
db_read_bytes(sp + 4, sizeof(vaddr_t), (char *)&lr);
}
while (count && sp != 0) {
/*
* lr contains the return address, so adjust its value
* to display the offset of the calling address.
*/
sym = db_search_symbol(lr - 4, DB_STGY_ANY, &offset);
db_symbol_values(sym, &name, NULL);
if (name == NULL || strcmp(name, "end") == 0) {
(*pr)("at 0x%lx", lr - 4);
} else {
narg = db_ctf_func_numargs(sym);
if (narg < 0 || narg > 8)
narg = 8;
(*pr)("%s(", name);
if (narg > 0) {
db_fp_args = (vaddr_t *)(sp + 8);
for (i = 0; i < narg; i++) {
(*pr)("%lx", db_fp_args[i]);
if (i != (narg-1))
(*pr)(",");
}
}
(*pr)(") at ");
db_printsym(lr - 4, DB_STGY_PROC, pr);
}
(*pr)("\n");
lastsp = sp;
/*
* Abuse the fact that the return address of the trap()
* function is always 'trapexit'.
*/
if (lr == (vaddr_t)&trapexit) {
struct trapframe *tf = (struct trapframe *)(sp + 8);
uint32_t code = tf->fixreg[0];
uint32_t type = tf->exc;
if (tf->srr1 & PSL_PR)
type |= EXC_USER;
if (type == (EXC_SC|EXC_USER))
(*pr)("--- syscall (number %d) ---\n", code);
else
(*pr)("--- trap (type 0x%x) ---\n", type);
}
db_read_bytes(sp, sizeof(vaddr_t), (char *)&sp);
if (sp == 0)
break;
db_read_bytes(sp + 4, sizeof(vaddr_t), (char *)&lr);
if (INKERNEL(sp)) {
if (sp <= lastsp) {
(*pr)("Bad frame pointer: 0x%lx\n", sp);
break;
}
if (ININTSTK(lastsp))
(*pr)("--- interrupt ---\n");
} else {
if (!ININTSTK(sp)) {
(*pr)("End of kernel: 0x%lx\n", sp);
break;
}
}
--count;
}
(*pr)("end trace frame: 0x%lx, count: %d\n", sp, count);
}
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