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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 "opt_ddb.h"
#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/debug_monitor.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>
static void
db_stack_trace_cmd(struct unwind_state *state)
{
const char *name;
db_expr_t value;
db_expr_t offset;
c_db_sym_t sym;
u_int reg, i;
char *sep;
uint16_t upd_mask;
bool finished;
finished = false;
while (!finished) {
finished = unwind_stack_one(state, 1);
/* Print the frame details */
sym = db_search_symbol(state->start_pc, 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(state->start_pc, DB_STGY_PROC);
db_printf("\n");
db_printf("\t pc = 0x%08x lr = 0x%08x (", state->start_pc,
state->registers[LR]);
db_printsym(state->registers[LR], DB_STGY_PROC);
db_printf(")\n");
db_printf("\t sp = 0x%08x fp = 0x%08x",
state->registers[SP], state->registers[FP]);
/* Don't print the registers we have already printed */
upd_mask = state->update_mask &
~((1 << SP) | (1 << FP) | (1 << LR) | (1 << PC));
sep = "\n\t";
for (i = 0, reg = 0; upd_mask != 0; upd_mask >>= 1, reg++) {
if ((upd_mask & 1) != 0) {
db_printf("%s%sr%d = 0x%08x", sep,
(reg < 10) ? " " : "", reg,
state->registers[reg]);
i++;
if (i == 2) {
sep = "\n\t";
i = 0;
} else
sep = " ";
}
}
db_printf("\n");
if (finished)
break;
/*
* Stop if directed to do so, or if we've unwound back to the
* kernel entry point, or if the unwind function didn't change
* anything (to avoid getting stuck in this loop forever).
* If the latter happens, it's an indication that the unwind
* information is incorrect somehow for the function named in
* the last frame printed before you see the unwind failure
* message (maybe it needs a STOP_UNWINDING).
*/
if (state->registers[PC] < VM_MIN_KERNEL_ADDRESS) {
db_printf("Unable to unwind into user mode\n");
finished = true;
} else if (state->update_mask == 0) {
db_printf("Unwind failure (no registers changed)\n");
finished = true;
}
}
}
void
db_md_list_watchpoints(void)
{
dbg_show_watchpoint();
}
int
db_md_clr_watchpoint(db_expr_t addr, db_expr_t size)
{
return (dbg_remove_watchpoint(addr, size));
}
int
db_md_set_watchpoint(db_expr_t addr, db_expr_t size)
{
return (dbg_setup_watchpoint(addr, size, HW_WATCHPOINT_RW));
}
int
db_trace_thread(struct thread *thr, int count)
{
struct unwind_state state;
struct pcb *ctx;
if (thr != curthread) {
ctx = kdb_thr_ctx(thr);
state.registers[FP] = ctx->pcb_regs.sf_r11;
state.registers[SP] = ctx->pcb_regs.sf_sp;
state.registers[LR] = ctx->pcb_regs.sf_lr;
state.registers[PC] = ctx->pcb_regs.sf_pc;
db_stack_trace_cmd(&state);
} else
db_trace_self();
return (0);
}
void
db_trace_self(void)
{
struct unwind_state state;
uint32_t sp;
/* Read the stack pointer */
__asm __volatile("mov %0, sp" : "=&r" (sp));
state.registers[FP] = (uint32_t)__builtin_frame_address(0);
state.registers[SP] = sp;
state.registers[LR] = (uint32_t)__builtin_return_address(0);
state.registers[PC] = (uint32_t)db_trace_self;
db_stack_trace_cmd(&state);
}
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