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Currently, on 8641D, which doesn't set CONFIG_HAVE_HW_BREAKPOINT we get the following splat: BUG: using smp_processor_id() in preemptible [00000000] code: login/1382 caller is set_breakpoint+0x1c/0xa0 CPU: 0 PID: 1382 Comm: login Not tainted 3.15.0-rc3-00041-g2aafe1a4d451 #1 Call Trace: [decd5d80] [c0008dc4] show_stack+0x50/0x158 (unreliable) [decd5dc0] [c03c6fa0] dump_stack+0x7c/0xdc [decd5de0] [c01f8818] check_preemption_disabled+0xf4/0x104 [decd5e00] [c00086b8] set_breakpoint+0x1c/0xa0 [decd5e10] [c00d4530] flush_old_exec+0x2bc/0x588 [decd5e40] [c011c468] load_elf_binary+0x2ac/0x1164 [decd5ec0] [c00d35f8] search_binary_handler+0xc4/0x1f8 [decd5ef0] [c00d4ee8] do_execve+0x3d8/0x4b8 [decd5f40] [c001185c] ret_from_syscall+0x0/0x38 --- Exception: c01 at 0xfeee554 LR = 0xfeee7d4 The call path in this case is: flush_thread --> set_debug_reg_defaults --> set_breakpoint --> __get_cpu_var Since preemption is enabled in the cleanup of flush thread, and there is no need to disable it, introduce the distinction between set_breakpoint and __set_breakpoint, leaving only the flush_thread instance as the current user of set_breakpoint. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
93 lines
3.1 KiB
C
93 lines
3.1 KiB
C
/*
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* PowerPC BookIII S hardware breakpoint definitions
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright 2010, IBM Corporation.
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* Author: K.Prasad <prasad@linux.vnet.ibm.com>
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*
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*/
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#ifndef _PPC_BOOK3S_64_HW_BREAKPOINT_H
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#define _PPC_BOOK3S_64_HW_BREAKPOINT_H
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#ifdef __KERNEL__
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struct arch_hw_breakpoint {
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unsigned long address;
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u16 type;
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u16 len; /* length of the target data symbol */
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};
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/* Note: Don't change the the first 6 bits below as they are in the same order
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* as the dabr and dabrx.
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*/
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#define HW_BRK_TYPE_READ 0x01
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#define HW_BRK_TYPE_WRITE 0x02
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#define HW_BRK_TYPE_TRANSLATE 0x04
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#define HW_BRK_TYPE_USER 0x08
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#define HW_BRK_TYPE_KERNEL 0x10
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#define HW_BRK_TYPE_HYP 0x20
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#define HW_BRK_TYPE_EXTRANEOUS_IRQ 0x80
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/* bits that overlap with the bottom 3 bits of the dabr */
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#define HW_BRK_TYPE_RDWR (HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE)
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#define HW_BRK_TYPE_DABR (HW_BRK_TYPE_RDWR | HW_BRK_TYPE_TRANSLATE)
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#define HW_BRK_TYPE_PRIV_ALL (HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \
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HW_BRK_TYPE_HYP)
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#ifdef CONFIG_HAVE_HW_BREAKPOINT
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#include <linux/kdebug.h>
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#include <asm/reg.h>
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#include <asm/debug.h>
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struct perf_event;
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struct pmu;
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struct perf_sample_data;
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#define HW_BREAKPOINT_ALIGN 0x7
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extern int hw_breakpoint_slots(int type);
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extern int arch_bp_generic_fields(int type, int *gen_bp_type);
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extern int arch_check_bp_in_kernelspace(struct perf_event *bp);
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extern int arch_validate_hwbkpt_settings(struct perf_event *bp);
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extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
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unsigned long val, void *data);
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int arch_install_hw_breakpoint(struct perf_event *bp);
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void arch_uninstall_hw_breakpoint(struct perf_event *bp);
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void hw_breakpoint_pmu_read(struct perf_event *bp);
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extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
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extern struct pmu perf_ops_bp;
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extern void ptrace_triggered(struct perf_event *bp,
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struct perf_sample_data *data, struct pt_regs *regs);
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static inline void hw_breakpoint_disable(void)
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{
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struct arch_hw_breakpoint brk;
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brk.address = 0;
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brk.type = 0;
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brk.len = 0;
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__set_breakpoint(&brk);
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}
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extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
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#else /* CONFIG_HAVE_HW_BREAKPOINT */
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static inline void hw_breakpoint_disable(void) { }
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static inline void thread_change_pc(struct task_struct *tsk,
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struct pt_regs *regs) { }
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#endif /* CONFIG_HAVE_HW_BREAKPOINT */
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#endif /* __KERNEL__ */
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#endif /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */
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