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