/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* PowerPC BookIII S hardware breakpoint definitions
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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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#ifndef _PPC_BOOK3S_64_HW_BREAKPOINT_H
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#define _PPC_BOOK3S_64_HW_BREAKPOINT_H
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#include <asm/cpu_has_feature.h>
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#include <asm/inst.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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u16 hw_len; /* length programmed in hw */
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u8 flags;
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};
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/* Note: Don't change 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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#define HW_BRK_FLAG_DISABLED 0x1
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/* Minimum granularity */
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#ifdef CONFIG_PPC_8xx
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#define HW_BREAKPOINT_SIZE 0x4
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#else
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#define HW_BREAKPOINT_SIZE 0x8
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#endif
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#define HW_BREAKPOINT_SIZE_QUADWORD 0x10
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#define DABR_MAX_LEN 8
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#define DAWR_MAX_LEN 512
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static inline int nr_wp_slots(void)
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{
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return cpu_has_feature(CPU_FTR_DAWR1) ? 2 : 1;
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}
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bool wp_check_constraints(struct pt_regs *regs, struct ppc_inst instr,
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unsigned long ea, int type, int size,
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struct arch_hw_breakpoint *info);
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void wp_get_instr_detail(struct pt_regs *regs, struct ppc_inst *instr,
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int *type, int *size, unsigned long *ea);
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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_attr;
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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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struct task_struct;
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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 arch_hw_breakpoint *hw);
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extern int hw_breakpoint_arch_parse(struct perf_event *bp,
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const struct perf_event_attr *attr,
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struct arch_hw_breakpoint *hw);
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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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int i;
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struct arch_hw_breakpoint null_brk = {0};
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if (!ppc_breakpoint_available())
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return;
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for (i = 0; i < nr_wp_slots(); i++)
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__set_breakpoint(i, &null_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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int hw_breakpoint_handler(struct die_args *args);
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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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#ifdef CONFIG_PPC_DAWR
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extern bool dawr_force_enable;
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static inline bool dawr_enabled(void)
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{
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return dawr_force_enable;
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}
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int set_dawr(int nr, struct arch_hw_breakpoint *brk);
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#else
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static inline bool dawr_enabled(void) { return false; }
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static inline int set_dawr(int nr, struct arch_hw_breakpoint *brk) { return -1; }
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#endif
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#endif /* __KERNEL__ */
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#endif /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */
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