4352fc1b12
This is the next big chunk of hw_breakpoint support. This decouples the SH-4A support from the core and moves it out in to its own stub, following many of the conventions established with the perf events layering. In addition to extending SH-4A support to encapsulate the remainder of the UBC channels, clock framework support for handling the UBC interface clock is added as well, allowing for dynamic clock gating. This also fixes up a regression introduced by the SIGTRAP handling that broke the ksym_tracer, to the extent that the current support works well with all of the ksym_tracer/ptrace/kgdb. The kprobes singlestep code will follow in turn. With this in place, the remaining UBC variants (SH-2A and SH-4) can now be trivially plugged in. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
#ifndef __ASM_SH_HW_BREAKPOINT_H
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#define __ASM_SH_HW_BREAKPOINT_H
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#include <linux/kdebug.h>
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#include <linux/types.h>
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#ifdef __KERNEL__
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#define __ARCH_HW_BREAKPOINT_H
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struct arch_hw_breakpoint {
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char *name; /* Contains name of the symbol to set bkpt */
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unsigned long address;
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u16 len;
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u16 type;
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};
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enum {
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SH_BREAKPOINT_READ = (1 << 1),
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SH_BREAKPOINT_WRITE = (1 << 2),
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SH_BREAKPOINT_RW = SH_BREAKPOINT_READ | SH_BREAKPOINT_WRITE,
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SH_BREAKPOINT_LEN_1 = (1 << 12),
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SH_BREAKPOINT_LEN_2 = (1 << 13),
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SH_BREAKPOINT_LEN_4 = SH_BREAKPOINT_LEN_1 | SH_BREAKPOINT_LEN_2,
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SH_BREAKPOINT_LEN_8 = (1 << 14),
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};
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struct sh_ubc {
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const char *name;
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unsigned int num_events;
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unsigned int trap_nr;
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void (*enable)(struct arch_hw_breakpoint *, int);
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void (*disable)(struct arch_hw_breakpoint *, int);
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void (*enable_all)(unsigned long);
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void (*disable_all)(void);
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unsigned long (*active_mask)(void);
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unsigned long (*triggered_mask)(void);
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void (*clear_triggered_mask)(unsigned long);
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struct clk *clk; /* optional interface clock / MSTP bit */
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};
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struct perf_event;
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struct task_struct;
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struct pmu;
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/* Maximum number of UBC channels */
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#define HBP_NUM 2
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/* arch/sh/kernel/hw_breakpoint.c */
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extern int arch_check_va_in_userspace(unsigned long va, u16 hbp_len);
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extern int arch_validate_hwbkpt_settings(struct perf_event *bp,
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struct task_struct *tsk);
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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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void hw_breakpoint_pmu_unthrottle(struct perf_event *bp);
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extern void arch_fill_perf_breakpoint(struct perf_event *bp);
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extern int register_sh_ubc(struct sh_ubc *);
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extern struct pmu perf_ops_bp;
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#endif /* __KERNEL__ */
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#endif /* __ASM_SH_HW_BREAKPOINT_H */
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