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/* $NetBSD: db_trace.c,v 1.8 2003/01/17 22:28:48 thorpej Exp $ */
/*-
* Copyright (c) 2000, 2001 Ben Harris
* Copyright (c) 1996 Scott K. Stevens
*
* Mach Operating System
* Copyright (c) 1991,1990 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 the
* rights to redistribute these changes.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/kdb.h>
#include <sys/stack.h>
#include <machine/armreg.h>
#include <machine/asm.h>
#include <machine/cpufunc.h>
#include <machine/db_machdep.h>
#include <machine/pcb.h>
#include <machine/stack.h>
#include <machine/vmparam.h>
#include <ddb/ddb.h>
#include <ddb/db_access.h>
#include <ddb/db_sym.h>
#include <ddb/db_output.h>
/*
* APCS stack frames are awkward beasts, so I don't think even trying to use
* a structure to represent them is a good idea.
*
* Here's the diagram from the APCS. Increasing address is _up_ the page.
*
* save code pointer [fp] <- fp points to here
* return link value [fp, #-4]
* return sp value [fp, #-8]
* return fp value [fp, #-12]
* [saved v7 value]
* [saved v6 value]
* [saved v5 value]
* [saved v4 value]
* [saved v3 value]
* [saved v2 value]
* [saved v1 value]
* [saved a4 value]
* [saved a3 value]
* [saved a2 value]
* [saved a1 value]
*
* The save code pointer points twelve bytes beyond the start of the
* code sequence (usually a single STM) that created the stack frame.
* We have to disassemble it if we want to know which of the optional
* fields are actually present.
*/
static void
db_stack_trace_cmd(db_expr_t addr, db_expr_t count)
{
u_int32_t *frame, *lastframe;
c_db_sym_t sym;
const char *name;
db_expr_t value;
db_expr_t offset;
boolean_t kernel_only = TRUE;
int scp_offset;
frame = (u_int32_t *)addr;
lastframe = NULL;
scp_offset = -(get_pc_str_offset() >> 2);
while (count-- && frame != NULL && !db_pager_quit) {
db_addr_t scp;
u_int32_t savecode;
int r;
u_int32_t *rp;
const char *sep;
/*
* In theory, the SCP isn't guaranteed to be in the function
* that generated the stack frame. We hope for the best.
*/
scp = frame[FR_SCP];
sym = db_search_symbol(scp, DB_STGY_ANY, &offset);
if (sym == C_DB_SYM_NULL) {
value = 0;
name = "(null)";
} else
db_symbol_values(sym, &name, &value);
db_printf("%s() at ", name);
db_printsym(scp, DB_STGY_PROC);
db_printf("\n");
#ifdef __PROG26
db_printf("scp=0x%08x rlv=0x%08x (", scp, frame[FR_RLV] & R15_PC);
db_printsym(frame[FR_RLV] & R15_PC, DB_STGY_PROC);
db_printf(")\n");
#else
db_printf("scp=0x%08x rlv=0x%08x (", scp, frame[FR_RLV]);
db_printsym(frame[FR_RLV], DB_STGY_PROC);
db_printf(")\n");
#endif
db_printf("\trsp=0x%08x rfp=0x%08x", frame[FR_RSP], frame[FR_RFP]);
savecode = ((u_int32_t *)scp)[scp_offset];
if ((savecode & 0x0e100000) == 0x08000000) {
/* Looks like an STM */
rp = frame - 4;
sep = "\n\t";
for (r = 10; r >= 0; r--) {
if (savecode & (1 << r)) {
db_printf("%sr%d=0x%08x",
sep, r, *rp--);
sep = (frame - rp) % 4 == 2 ?
"\n\t" : " ";
}
}
}
db_printf("\n");
/*
* Switch to next frame up
*/
if (frame[FR_RFP] == 0)
break; /* Top of stack */
lastframe = frame;
frame = (u_int32_t *)(frame[FR_RFP]);
if (INKERNEL((int)frame)) {
/* staying in kernel */
if (frame <= lastframe) {
db_printf("Bad frame pointer: %p\n", frame);
break;
}
} else if (INKERNEL((int)lastframe)) {
/* switch from user to kernel */
if (kernel_only)
break; /* kernel stack only */
} else {
/* in user */
if (frame <= lastframe) {
db_printf("Bad user frame pointer: %p\n",
frame);
break;
}
}
}
}
/* XXX stubs */
void
db_md_list_watchpoints()
{
}
int
db_md_clr_watchpoint(db_expr_t addr, db_expr_t size)
{
return (0);
}
int
db_md_set_watchpoint(db_expr_t addr, db_expr_t size)
{
return (0);
}
int
db_trace_thread(struct thread *thr, int count)
{
uint32_t addr;
if (thr == curthread)
addr = (uint32_t)__builtin_frame_address(0);
else
addr = thr->td_pcb->un_32.pcb32_r11;
db_stack_trace_cmd(addr, -1);
return (0);
}
void
db_trace_self(void)
{
db_trace_thread(curthread, -1);
}
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