gdbstub.h

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/*
 * Copyright (c) 2023 Marek Vedral <vedrama5@fel.cvut.cz>
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_INCLUDE_ARCH_ARM_AARCH32_GDBSTUB_H_
#define ZEPHYR_INCLUDE_ARCH_ARM_AARCH32_GDBSTUB_H_
 
#include <zephyr/arch/arm/exc.h>
 
#ifndef _ASMLANGUAGE
 
#define DBGDSCR_MONITOR_MODE_EN 0x8000
 
#define SPSR_ISETSTATE_ARM     0x0
#define SPSR_ISETSTATE_JAZELLE 0x2
#define SPSR_J                 24
#define SPSR_T                 5
 
/* Debug Breakpoint Control Register constants */
#define DBGDBCR_MEANING_MASK          0x7
#define DBGDBCR_MEANING_SHIFT         20
#define DBGDBCR_MEANING_ADDR_MISMATCH 0x4
#define DBGDBCR_BYTE_ADDR_MASK        0xF
#define DBGDBCR_BYTE_ADDR_SHIFT       5
#define DBGDBCR_BRK_EN_MASK           0x1
 
/* Regno of the SPSR */
#define SPSR_REG_IDX    25
/* Minimal size of the packet - SPSR is the last, 42-nd byte, see packet_pos array */
#define GDB_READALL_PACKET_SIZE (42 * 8)
 
#define IFSR_DEBUG_EVENT 0x2
 
enum AARCH32_GDB_REG {
        R0 = 0,
        R1,
        R2,
        R3,
        /* READONLY registers (R4 - R13) except R12 */
        R4,
        R5,
        R6,
        R7,
        R8,
        R9,
        R10,
        R11,
        R12,
        /* Stack pointer - READONLY */
        R13,
        LR,
        PC,
        /* Saved program status register */
        SPSR,
        GDB_NUM_REGS
};
 
/* required structure */
struct gdb_ctx {
        /* cause of the exception */
        unsigned int exception;
        unsigned int registers[GDB_NUM_REGS];
};
 
void z_gdb_entry(struct arch_esf *esf, unsigned int exc_cause);
 
#endif
 
#endif