cortex_m.h

Go to the documentation of this file.

/* SPDX-License-Identifier: GPL-2.0-or-later */
 
/***************************************************************************
 *   Copyright (C) 2005 by Dominic Rath                                    *
 *   Dominic.Rath@gmx.de                                                   *
 *                                                                         *
 *   Copyright (C) 2006 by Magnus Lundin                                   *
 *   lundin@mlu.mine.nu                                                    *
 *                                                                         *
 *   Copyright (C) 2008 by Spencer Oliver                                  *
 *   spen@spen-soft.co.uk                                                  *
 ***************************************************************************/
 
#ifndef OPENOCD_TARGET_CORTEX_M_H
#define OPENOCD_TARGET_CORTEX_M_H
 
#include "armv7m.h"
#include "helper/bits.h"
 
#define CORTEX_M_COMMON_MAGIC 0x1A451A45U
 
#define SYSTEM_CONTROL_BASE 0x400FE000
 
#define ITM_TER0    0xE0000E00
#define ITM_TPR     0xE0000E40
#define ITM_TCR     0xE0000E80
#define ITM_TCR_ITMENA_BIT  BIT(0)
#define ITM_TCR_BUSY_BIT    BIT(23)
#define ITM_LAR     0xE0000FB0
#define ITM_LAR_KEY 0xC5ACCE55
 
#define CPUID       0xE000ED00
 
#define ARM_CPUID_IMPLEMENTER_POS   24
#define ARM_CPUID_IMPLEMENTER_MASK  (0xFF << ARM_CPUID_IMPLEMENTER_POS)
#define ARM_CPUID_PARTNO_POS        4
#define ARM_CPUID_PARTNO_MASK       (0xFFF << ARM_CPUID_PARTNO_POS)
 
#define ARM_MAKE_CPUID(impl, partno)    ((((impl) << ARM_CPUID_IMPLEMENTER_POS) & ARM_CPUID_IMPLEMENTER_MASK) | \
    (((partno) << ARM_CPUID_PARTNO_POS)  & ARM_CPUID_PARTNO_MASK))
 
enum cortex_m_impl_part {
    CORTEX_M_PARTNO_INVALID,
    STAR_MC1_PARTNO      = ARM_MAKE_CPUID(ARM_IMPLEMENTER_ARM_CHINA, 0x132),
    CORTEX_M0_PARTNO     = ARM_MAKE_CPUID(ARM_IMPLEMENTER_ARM, 0xC20),
    CORTEX_M1_PARTNO     = ARM_MAKE_CPUID(ARM_IMPLEMENTER_ARM, 0xC21),
    CORTEX_M3_PARTNO     = ARM_MAKE_CPUID(ARM_IMPLEMENTER_ARM, 0xC23),
    CORTEX_M4_PARTNO     = ARM_MAKE_CPUID(ARM_IMPLEMENTER_ARM, 0xC24),
    CORTEX_M7_PARTNO     = ARM_MAKE_CPUID(ARM_IMPLEMENTER_ARM, 0xC27),
    CORTEX_M0P_PARTNO    = ARM_MAKE_CPUID(ARM_IMPLEMENTER_ARM, 0xC60),
    CORTEX_M23_PARTNO    = ARM_MAKE_CPUID(ARM_IMPLEMENTER_ARM, 0xD20),
    CORTEX_M33_PARTNO    = ARM_MAKE_CPUID(ARM_IMPLEMENTER_ARM, 0xD21),
    CORTEX_M35P_PARTNO   = ARM_MAKE_CPUID(ARM_IMPLEMENTER_ARM, 0xD31),
    CORTEX_M52_PARTNO    = ARM_MAKE_CPUID(ARM_IMPLEMENTER_ARM_CHINA, 0xD24),
    CORTEX_M55_PARTNO    = ARM_MAKE_CPUID(ARM_IMPLEMENTER_ARM, 0xD22),
    CORTEX_M85_PARTNO    = ARM_MAKE_CPUID(ARM_IMPLEMENTER_ARM, 0xD23),
    INFINEON_SLX2_PARTNO = ARM_MAKE_CPUID(ARM_IMPLEMENTER_INFINEON, 0xDB0),
    REALTEK_M200_PARTNO  = ARM_MAKE_CPUID(ARM_IMPLEMENTER_REALTEK, 0xd20),
    REALTEK_M300_PARTNO  = ARM_MAKE_CPUID(ARM_IMPLEMENTER_REALTEK, 0xd22),
};
 
/* Relevant Cortex-M flags, used in struct cortex_m_part_info.flags */
#define CORTEX_M_F_HAS_FPV4               BIT(0)
#define CORTEX_M_F_HAS_FPV5               BIT(1)
#define CORTEX_M_F_TAR_AUTOINCR_BLOCK_4K  BIT(2)
 
struct cortex_m_part_info {
    enum cortex_m_impl_part impl_part;
    const char *name;
    enum arm_arch arch;
    uint32_t flags;
};
 
/* Debug Control Block */
#define DCB_DHCSR   0xE000EDF0
#define DCB_DCRSR   0xE000EDF4
#define DCB_DCRDR   0xE000EDF8
#define DCB_DEMCR   0xE000EDFC
#define DCB_DSCSR   0xE000EE08
 
#define DAUTHSTATUS 0xE000EFB8
#define DAUTHSTATUS_SID_MASK    0x00000030
 
#define DCRSR_WNR   BIT(16)
 
#define DWT_CTRL    0xE0001000
#define DWT_CYCCNT  0xE0001004
#define DWT_PCSR    0xE000101C
#define DWT_COMP0   0xE0001020
#define DWT_MASK0   0xE0001024
#define DWT_FUNCTION0   0xE0001028
#define DWT_DEVARCH     0xE0001FBC
 
#define DWT_DEVARCH_ARMV8M_V2_0 0x101A02
#define DWT_DEVARCH_ARMV8M_V2_1 0x111A02
 
#define FP_CTRL     0xE0002000
#define FP_REMAP    0xE0002004
#define FP_COMP0    0xE0002008
#define FP_COMP1    0xE000200C
#define FP_COMP2    0xE0002010
#define FP_COMP3    0xE0002014
#define FP_COMP4    0xE0002018
#define FP_COMP5    0xE000201C
#define FP_COMP6    0xE0002020
#define FP_COMP7    0xE0002024
 
#define FPU_CPACR   0xE000ED88
#define FPU_FPCCR   0xE000EF34
#define FPU_FPCAR   0xE000EF38
#define FPU_FPDSCR  0xE000EF3C
 
#define TPIU_SSPSR  0xE0040000
#define TPIU_CSPSR  0xE0040004
#define TPIU_ACPR   0xE0040010
#define TPIU_SPPR   0xE00400F0
#define TPIU_FFSR   0xE0040300
#define TPIU_FFCR   0xE0040304
#define TPIU_FSCR   0xE0040308
 
/* Maximum SWO prescaler value. */
#define TPIU_ACPR_MAX_SWOSCALER 0x1fff
 
/* DCB_DHCSR bit and field definitions */
#define DBGKEY      (0xA05Ful << 16)
#define C_DEBUGEN   BIT(0)
#define C_HALT      BIT(1)
#define C_STEP      BIT(2)
#define C_MASKINTS  BIT(3)
#define S_REGRDY    BIT(16)
#define S_HALT      BIT(17)
#define S_SLEEP     BIT(18)
#define S_LOCKUP    BIT(19)
#define S_RETIRE_ST BIT(24)
#define S_RESET_ST  BIT(25)
 
/* DCB_DEMCR bit and field definitions */
#define TRCENA          BIT(24)
#define VC_HARDERR      BIT(10)
#define VC_INTERR       BIT(9)
#define VC_BUSERR       BIT(8)
#define VC_STATERR      BIT(7)
#define VC_CHKERR       BIT(6)
#define VC_NOCPERR      BIT(5)
#define VC_MMERR        BIT(4)
#define VC_CORERESET    BIT(0)
 
/* DCB_DSCSR bit and field definitions */
#define DSCSR_CDSKEY    BIT(17)
#define DSCSR_CDS       BIT(16)
 
/* NVIC registers */
#define NVIC_ICTR       0xE000E004
#define NVIC_ISE0       0xE000E100
#define NVIC_ICSR       0xE000ED04
#define NVIC_AIRCR      0xE000ED0C
#define NVIC_SHCSR      0xE000ED24
#define NVIC_CFSR       0xE000ED28
#define NVIC_MMFSRB     0xE000ED28
#define NVIC_BFSRB      0xE000ED29
#define NVIC_USFSRH     0xE000ED2A
#define NVIC_HFSR       0xE000ED2C
#define NVIC_DFSR       0xE000ED30
#define NVIC_MMFAR      0xE000ED34
#define NVIC_BFAR       0xE000ED38
#define MPU_CTRL        0xE000ED94
#define SAU_CTRL        0xE000EDD0
#define NVIC_SFSR       0xE000EDE4
#define NVIC_SFAR       0xE000EDE8
 
/* NVIC_AIRCR bits */
#define AIRCR_VECTKEY       (0x5FAul << 16)
#define AIRCR_SYSRESETREQ   BIT(2)
#define AIRCR_VECTCLRACTIVE BIT(1)
#define AIRCR_VECTRESET     BIT(0)
/* NVIC_SHCSR bits */
#define SHCSR_BUSFAULTENA   BIT(17)
/* NVIC_DFSR bits */
#define DFSR_HALTED         1
#define DFSR_BKPT           2
#define DFSR_DWTTRAP        4
#define DFSR_VCATCH         8
#define DFSR_EXTERNAL       16
 
#define MPU_CTRL_ENABLE     BIT(0)
#define SAU_CTRL_ENABLE     BIT(0)
 
#define FPCR_CODE 0
#define FPCR_LITERAL 1
#define FPCR_REPLACE_REMAP  (0ul << 30)
#define FPCR_REPLACE_BKPT_LOW  (1ul << 30)
#define FPCR_REPLACE_BKPT_HIGH  (2ul << 30)
#define FPCR_REPLACE_BKPT_BOTH  (3ul << 30)
 
struct cortex_m_fp_comparator {
    bool used;
    int type;
    uint32_t fpcr_value;
    uint32_t fpcr_address;
};
 
struct cortex_m_dwt_comparator {
    bool used;
    uint32_t comp;
    uint32_t mask;
    uint32_t function;
    uint32_t dwt_comparator_address;
};
 
enum cortex_m_soft_reset_config {
    CORTEX_M_RESET_SYSRESETREQ,
    CORTEX_M_RESET_VECTRESET,
};
 
enum cortex_m_isrmasking_mode {
    CORTEX_M_ISRMASK_AUTO,
    CORTEX_M_ISRMASK_OFF,
    CORTEX_M_ISRMASK_ON,
    CORTEX_M_ISRMASK_STEPONLY,
};
 
struct cortex_m_common {
    unsigned int common_magic;
 
    struct armv7m_common armv7m;
 
    /* Context information */
    uint32_t dcb_dhcsr;
    uint32_t dcb_dhcsr_cumulated_sticky;
    /* DCB DHCSR has been at least once read, so the sticky bits have been reset */
    bool dcb_dhcsr_sticky_is_recent;
    uint32_t nvic_dfsr;  /* Debug Fault Status Register - shows reason for debug halt */
    uint32_t nvic_icsr;  /* Interrupt Control State Register - shows active and pending IRQ */
 
    /* Flash Patch and Breakpoint (FPB) */
    unsigned int fp_num_lit;
    unsigned int fp_num_code;
    int fp_rev;
    bool fpb_enabled;
    struct cortex_m_fp_comparator *fp_comparator_list;
 
    /* Data Watchpoint and Trace (DWT) */
    unsigned int dwt_num_comp;
    unsigned int dwt_comp_available;
    uint32_t dwt_devarch;
    struct cortex_m_dwt_comparator *dwt_comparator_list;
    struct reg_cache *dwt_cache;
 
    enum cortex_m_soft_reset_config soft_reset_config;
    bool vectreset_supported;
    enum cortex_m_isrmasking_mode isrmasking_mode;
 
    const struct cortex_m_part_info *core_info;
 
    bool slow_register_read;    /* A register has not been ready, poll S_REGRDY */
 
    uint64_t apsel;
 
    /* Whether this target has the erratum that makes C_MASKINTS not apply to
     * already pending interrupts */
    bool maskints_erratum;
 
    /* Errata 3092511 Cortex-M7 can halt in an incorrect address when breakpoint
     * and exception occurs simultaneously */
    bool incorrect_halt_erratum;
};
 
struct cortex_m_saved_security {
    bool dscsr_dirty;
    uint32_t dscsr;
    bool sau_ctrl_dirty;
    uint32_t sau_ctrl;
    bool mpu_ctrl_dirty;
    uint32_t mpu_ctrl;
};
 
static inline bool is_cortex_m_or_hla(const struct cortex_m_common *cortex_m)
{
    return cortex_m->common_magic == CORTEX_M_COMMON_MAGIC;
}
 
static inline bool is_cortex_m_with_dap_access(const struct cortex_m_common *cortex_m)
{
    if (!is_cortex_m_or_hla(cortex_m))
        return false;
 
    return !cortex_m->armv7m.is_hla_target;
}
 
static inline struct cortex_m_common *
target_to_cm(struct target *target)
{
    return container_of(target->arch_info,
            struct cortex_m_common, armv7m.arm);
}
 
static inline struct cortex_m_common *
target_to_cortex_m_safe(struct target *target)
{
    /* Check the parent types first to prevent peeking memory too far
     * from arch_info pointer */
    if (!target_to_armv7m_safe(target))
        return NULL;
 
    struct cortex_m_common *cortex_m = target_to_cm(target);
    if (!is_cortex_m_or_hla(cortex_m))
        return NULL;
 
    return cortex_m;
}
 
static inline enum cortex_m_impl_part cortex_m_get_impl_part(struct target *target)
{
    struct cortex_m_common *cortex_m = target_to_cortex_m_safe(target);
    if (!cortex_m)
        return CORTEX_M_PARTNO_INVALID;
 
    if (!cortex_m->core_info)
        return CORTEX_M_PARTNO_INVALID;
 
    return cortex_m->core_info->impl_part;
}
 
int cortex_m_examine(struct target *target);
int cortex_m_set_breakpoint(struct target *target, struct breakpoint *breakpoint);
int cortex_m_unset_breakpoint(struct target *target, struct breakpoint *breakpoint);
int cortex_m_add_breakpoint(struct target *target, struct breakpoint *breakpoint);
int cortex_m_remove_breakpoint(struct target *target, struct breakpoint *breakpoint);
int cortex_m_add_watchpoint(struct target *target, struct watchpoint *watchpoint);
int cortex_m_remove_watchpoint(struct target *target, struct watchpoint *watchpoint);
void cortex_m_enable_breakpoints(struct target *target);
void cortex_m_enable_watchpoints(struct target *target);
void cortex_m_deinit_target(struct target *target);
int cortex_m_profiling(struct target *target, uint32_t *samples,
    uint32_t max_num_samples, uint32_t *num_samples, uint32_t seconds);
 
int cortex_m_set_secure(struct target *target, struct cortex_m_saved_security *ssec);
 
int cortex_m_security_restore(struct target *target, struct cortex_m_saved_security *ssec);
 
#endif /* OPENOCD_TARGET_CORTEX_M_H */