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xen
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05/09/2024 07:14:16 AM
rwxr-xr-x
Editing: hw_breakpoint.h
Close
/* * Copyright (C) 2012 ARM Ltd. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #ifndef __ASM_HW_BREAKPOINT_H #define __ASM_HW_BREAKPOINT_H #include <asm/cputype.h> #include <asm/cpufeature.h> #include <asm/sysreg.h> #include <asm/virt.h> #ifdef __KERNEL__ struct arch_hw_breakpoint_ctrl { u32 __reserved : 19, len : 8, type : 2, privilege : 2, enabled : 1; }; struct arch_hw_breakpoint { u64 address; u64 trigger; struct arch_hw_breakpoint_ctrl ctrl; }; /* Privilege Levels */ #define AARCH64_BREAKPOINT_EL1 1 #define AARCH64_BREAKPOINT_EL0 2 #define DBG_HMC_HYP (1 << 13) static inline u32 encode_ctrl_reg(struct arch_hw_breakpoint_ctrl ctrl) { u32 val = (ctrl.len << 5) | (ctrl.type << 3) | (ctrl.privilege << 1) | ctrl.enabled; if (is_kernel_in_hyp_mode() && ctrl.privilege == AARCH64_BREAKPOINT_EL1) val |= DBG_HMC_HYP; return val; } static inline void decode_ctrl_reg(u32 reg, struct arch_hw_breakpoint_ctrl *ctrl) { ctrl->enabled = reg & 0x1; reg >>= 1; ctrl->privilege = reg & 0x3; reg >>= 2; ctrl->type = reg & 0x3; reg >>= 2; ctrl->len = reg & 0xff; } /* Breakpoint */ #define ARM_BREAKPOINT_EXECUTE 0 /* Watchpoints */ #define ARM_BREAKPOINT_LOAD 1 #define ARM_BREAKPOINT_STORE 2 #define AARCH64_ESR_ACCESS_MASK (1 << 6) /* Lengths */ #define ARM_BREAKPOINT_LEN_1 0x1 #define ARM_BREAKPOINT_LEN_2 0x3 #define ARM_BREAKPOINT_LEN_3 0x7 #define ARM_BREAKPOINT_LEN_4 0xf #define ARM_BREAKPOINT_LEN_5 0x1f #define ARM_BREAKPOINT_LEN_6 0x3f #define ARM_BREAKPOINT_LEN_7 0x7f #define ARM_BREAKPOINT_LEN_8 0xff /* Kernel stepping */ #define ARM_KERNEL_STEP_NONE 0 #define ARM_KERNEL_STEP_ACTIVE 1 #define ARM_KERNEL_STEP_SUSPEND 2 /* * Limits. * Changing these will require modifications to the register accessors. */ #define ARM_MAX_BRP 16 #define ARM_MAX_WRP 16 /* Virtual debug register bases. */ #define AARCH64_DBG_REG_BVR 0 #define AARCH64_DBG_REG_BCR (AARCH64_DBG_REG_BVR + ARM_MAX_BRP) #define AARCH64_DBG_REG_WVR (AARCH64_DBG_REG_BCR + ARM_MAX_BRP) #define AARCH64_DBG_REG_WCR (AARCH64_DBG_REG_WVR + ARM_MAX_WRP) /* Debug register names. */ #define AARCH64_DBG_REG_NAME_BVR bvr #define AARCH64_DBG_REG_NAME_BCR bcr #define AARCH64_DBG_REG_NAME_WVR wvr #define AARCH64_DBG_REG_NAME_WCR wcr /* Accessor macros for the debug registers. */ #define AARCH64_DBG_READ(N, REG, VAL) do {\ VAL = read_sysreg(dbg##REG##N##_el1);\ } while (0) #define AARCH64_DBG_WRITE(N, REG, VAL) do {\ write_sysreg(VAL, dbg##REG##N##_el1);\ } while (0) struct task_struct; struct notifier_block; struct perf_event; struct pmu; extern int arch_bp_generic_fields(struct arch_hw_breakpoint_ctrl ctrl, int *gen_len, int *gen_type, int *offset); extern int arch_check_bp_in_kernelspace(struct perf_event *bp); extern int arch_validate_hwbkpt_settings(struct perf_event *bp); extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused, unsigned long val, void *data); extern int arch_install_hw_breakpoint(struct perf_event *bp); extern void arch_uninstall_hw_breakpoint(struct perf_event *bp); extern void hw_breakpoint_pmu_read(struct perf_event *bp); extern int hw_breakpoint_slots(int type); #ifdef CONFIG_HAVE_HW_BREAKPOINT extern void hw_breakpoint_thread_switch(struct task_struct *next); extern void ptrace_hw_copy_thread(struct task_struct *task); #else static inline void hw_breakpoint_thread_switch(struct task_struct *next) { } static inline void ptrace_hw_copy_thread(struct task_struct *task) { } #endif /* Determine number of BRP registers available. */ static inline int get_num_brps(void) { u64 dfr0 = read_sanitised_ftr_reg(SYS_ID_AA64DFR0_EL1); return 1 + cpuid_feature_extract_unsigned_field(dfr0, ID_AA64DFR0_BRPS_SHIFT); } /* Determine number of WRP registers available. */ static inline int get_num_wrps(void) { u64 dfr0 = read_sanitised_ftr_reg(SYS_ID_AA64DFR0_EL1); return 1 + cpuid_feature_extract_unsigned_field(dfr0, ID_AA64DFR0_WRPS_SHIFT); } #endif /* __KERNEL__ */ #endif /* __ASM_BREAKPOINT_H */