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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178// SPDX-License-Identifier: GPL-2.0/* * Created by: Jason Wessel <jason.wessel@windriver.com> * * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved. * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */
#include <linux/kgdb.h>#include <linux/kdb.h>#include <linux/kdebug.h>#include <linux/export.h>#include <linux/hardirq.h>#include "kdb_private.h"#include "../debug_core.h"
/* * KDB interface to KGDB internals */get_char_func kdb_poll_funcs[] = { dbg_io_get_char, NULL, NULL, NULL, NULL, NULL,};EXPORT_SYMBOL_GPL(kdb_poll_funcs);
int kdb_poll_idx = 1;EXPORT_SYMBOL_GPL(kdb_poll_idx);
static struct kgdb_state *kdb_ks;
int kdb_common_init_state(struct kgdb_state *ks){ kdb_initial_cpu = atomic_read(&kgdb_active); kdb_current_task = kgdb_info[ks->cpu].task; kdb_current_regs = kgdb_info[ks->cpu].debuggerinfo; return 0;}
int kdb_common_deinit_state(void){ kdb_initial_cpu = -1; kdb_current_task = NULL; kdb_current_regs = NULL; return 0;}
int kdb_stub(struct kgdb_state *ks){ int error = 0; kdb_bp_t *bp; unsigned long addr = kgdb_arch_pc(ks->ex_vector, ks->linux_regs); kdb_reason_t reason = KDB_REASON_OOPS; kdb_dbtrap_t db_result = KDB_DB_NOBPT; int i;
kdb_ks = ks; if (KDB_STATE(REENTRY)) { reason = KDB_REASON_SWITCH; KDB_STATE_CLEAR(REENTRY); addr = instruction_pointer(ks->linux_regs); } ks->pass_exception = 0; if (atomic_read(&kgdb_setting_breakpoint)) reason = KDB_REASON_KEYBOARD;
if (ks->err_code == KDB_REASON_SYSTEM_NMI && ks->signo == SIGTRAP) reason = KDB_REASON_SYSTEM_NMI;
else if (in_nmi()) reason = KDB_REASON_NMI;
for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT; i++, bp++) { if ((bp->bp_enabled) && (bp->bp_addr == addr)) { reason = KDB_REASON_BREAK; db_result = KDB_DB_BPT; if (addr != instruction_pointer(ks->linux_regs)) kgdb_arch_set_pc(ks->linux_regs, addr); break; } } if (reason == KDB_REASON_BREAK || reason == KDB_REASON_SWITCH) { for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT; i++, bp++) { if (bp->bp_free) continue; if (bp->bp_addr == addr) { bp->bp_delay = 1; bp->bp_delayed = 1; /* * SSBPT is set when the kernel debugger must single step a * task in order to re-establish an instruction breakpoint * which uses the instruction replacement mechanism. It is * cleared by any action that removes the need to single-step * the breakpoint. */ reason = KDB_REASON_BREAK; db_result = KDB_DB_BPT; KDB_STATE_SET(SSBPT); break; } } }
if (reason != KDB_REASON_BREAK && ks->ex_vector == 0 && ks->signo == SIGTRAP) { reason = KDB_REASON_SSTEP; db_result = KDB_DB_BPT; } /* Set initial kdb state variables */ KDB_STATE_CLEAR(KGDB_TRANS); kdb_common_init_state(ks); /* Remove any breakpoints as needed by kdb and clear single step */ kdb_bp_remove(); KDB_STATE_CLEAR(DOING_SS); KDB_STATE_SET(PAGER); if (ks->err_code == DIE_OOPS || reason == KDB_REASON_OOPS) { ks->pass_exception = 1; KDB_FLAG_SET(CATASTROPHIC); } /* set CATASTROPHIC if the system contains unresponsive processors */ for_each_online_cpu(i) if (!kgdb_info[i].enter_kgdb) KDB_FLAG_SET(CATASTROPHIC); if (KDB_STATE(SSBPT) && reason == KDB_REASON_SSTEP) { KDB_STATE_CLEAR(SSBPT); KDB_STATE_CLEAR(DOING_SS); } else { /* Start kdb main loop */ error = kdb_main_loop(KDB_REASON_ENTER, reason, ks->err_code, db_result, ks->linux_regs); } /* * Upon exit from the kdb main loop setup break points and restart * the system based on the requested continue state */ kdb_common_deinit_state(); KDB_STATE_CLEAR(PAGER); if (error == KDB_CMD_KGDB) { if (KDB_STATE(DOING_KGDB)) KDB_STATE_CLEAR(DOING_KGDB); return DBG_PASS_EVENT; } kdb_bp_install(ks->linux_regs); /* Set the exit state to a single step or a continue */ if (KDB_STATE(DOING_SS)) gdbstub_state(ks, "s"); else gdbstub_state(ks, "c");
KDB_FLAG_CLEAR(CATASTROPHIC);
/* Invoke arch specific exception handling prior to system resume */ kgdb_info[ks->cpu].ret_state = gdbstub_state(ks, "e"); if (ks->pass_exception) kgdb_info[ks->cpu].ret_state = 1; if (error == KDB_CMD_CPU) { KDB_STATE_SET(REENTRY); /* * Force clear the single step bit because kdb emulates this * differently vs the gdbstub */ kgdb_single_step = 0; return DBG_SWITCH_CPU_EVENT; } return kgdb_info[ks->cpu].ret_state;}
void kdb_gdb_state_pass(char *buf){ gdbstub_state(kdb_ks, buf);}