hal_arch.h

ecos实时嵌入式操作系统

#define HAL_BREAKINST_ARM_SIZE     4
#define HAL_BREAKINST_THUMB        0xbebe  // illegal instruction currently
#define HAL_BREAKINST_THUMB_SIZE   2

#ifdef __thumb__

# define HAL_BREAKPOINT(_label_)                         \
asm volatile (" .code 16;"                               \
              " .globl  " #_label_ ";"                   \
              #_label_":"                                \
              " .short " _stringify(HAL_BREAKINST_THUMB) \
    );

# define HAL_BREAKINST           HAL_BREAKINST_THUMB
# define HAL_BREAKINST_SIZE      HAL_BREAKINST_THUMB_SIZE
# define HAL_BREAKINST_TYPE      cyg_uint16
#else // __thumb__

#define HAL_BREAKPOINT(_label_)                   \
asm volatile (" .globl  " #_label_ ";"            \
              #_label_":"                         \
              " .word " _stringify(HAL_BREAKINST_ARM) \
    );

//#define HAL_BREAKINST           {0xFE, 0xDE, 0xFF, 0xE7}
#define HAL_BREAKINST            HAL_BREAKINST_ARM
#define HAL_BREAKINST_SIZE       HAL_BREAKINST_ARM_SIZE
#define HAL_BREAKINST_TYPE       cyg_uint32
#endif // __thumb__


extern cyg_uint32 __arm_breakinst;
extern cyg_uint16 __thumb_breakinst;
#define HAL_BREAKINST_ADDR(x) (((x)==2)? \
                              ((void*)&__thumb_breakinst) : \
                              ((void*)&__arm_breakinst))

//--------------------------------------------------------------------------
// Thread register state manipulation for GDB support.

// Register layout expected by GDB
typedef struct
{
    cyg_uint32  gpr[16];
    cyg_uint32  f0[3];
    cyg_uint32  f1[3];
    cyg_uint32  f2[3];
    cyg_uint32  f3[3];
    cyg_uint32  f4[3];
    cyg_uint32  f5[3];
    cyg_uint32  f6[3];
    cyg_uint32  f7[3];
    cyg_uint32  fps;
    cyg_uint32  ps;
} GDB_Registers;

// Translate a stack pointer as saved by the thread context macros above into
// a pointer to a HAL_SavedRegisters structure.
#define HAL_THREAD_GET_SAVED_REGISTERS( _sp_, _regs_ )  \
        (_regs_) = (HAL_SavedRegisters *)(_sp_)

// Copy a set of coprocessor registers from a HAL_SavedRegisters structure
// into a GDB_Registers structure. GDB expects placeholders for FP regs
// even for non-FP targets, so we just zero fill the fields.
#define HAL_GET_GDB_COPROCESSOR_REGISTERS( _gdb_, _regs_ )      \
    CYG_MACRO_START                                             \
    cyg_uint32 *_p_ = _gdb_->f0;                                \
    for(_i_ = 0; _i_ < (8 * 3); _i_++)                          \
        *_p_++ = 0;                                             \
    _gdb_->fps = 0;                                             \
    CYG_MACRO_END

// Copy coprocessor registers from a GDB_Registers structure into a
// HAL_SavedRegisters structure.
#define HAL_SET_GDB_COPROCESSOR_REGISTERS( _regs_, _gdb_ )

// Copy a set of registers from a HAL_SavedRegisters structure into a
// GDB_Registers structure.
#define HAL_GET_GDB_REGISTERS( _aregval_, _regs_ )              \
    CYG_MACRO_START                                             \
    GDB_Registers *_gdb_ = (GDB_Registers *)(_aregval_);        \
    int _i_;                                                    \
                                                                \
    for( _i_ = 0; _i_ <= 10; _i_++ )                            \
        _gdb_->gpr[_i_] = (_regs_)->d[_i_];                     \
                                                                \
    _gdb_->gpr[11] = (_regs_)->fp;                              \
    _gdb_->gpr[12] = (_regs_)->ip;                              \
    _gdb_->gpr[13] = (_regs_)->sp;                              \
    _gdb_->gpr[14] = (_regs_)->lr;                              \
    _gdb_->gpr[15] = (_regs_)->pc;                              \
    _gdb_->ps = (_regs_)->cpsr;                                 \
    HAL_GET_GDB_COPROCESSOR_REGISTERS(_gdb_,_regs_);            \
    CYG_MACRO_END

// Copy a set of registers from a GDB_Registers structure into a
// HAL_SavedRegisters structure.
#define HAL_SET_GDB_REGISTERS( _regs_ , _aregval_ )             \
    CYG_MACRO_START                                             \
    GDB_Registers *_gdb_ = (GDB_Registers *)(_aregval_);        \
    int _i_;                                                    \
                                                                \
    for( _i_ = 0; _i_ <= 10; _i_++ )                            \
        (_regs_)->d[_i_] = _gdb_->gpr[_i_];                     \
                                                                \
    (_regs_)->fp = _gdb_->gpr[11];                              \
    (_regs_)->ip = _gdb_->gpr[12];                              \
    (_regs_)->sp = _gdb_->gpr[13];                              \
    (_regs_)->lr = _gdb_->gpr[14];                              \
    (_regs_)->pc = _gdb_->gpr[15];                              \
    (_regs_)->cpsr = _gdb_->ps;                                 \
    HAL_SET_GDB_COPROCESSOR_REGISTERS(_regs_,_gdb_);            \
    CYG_MACRO_END

#if defined(CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT) || defined(CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT)
#define HAL_GET_PROFILE_INFO( _thepc_, _thesp_ )                \
    CYG_MACRO_START                                             \
    extern HAL_SavedRegisters *hal_saved_interrupt_state;       \
    if ( hal_saved_interrupt_state ) {                          \
        (_thepc_) = (char *)(hal_saved_interrupt_state->pc);    \
        (_thesp_) = (char *)(hal_saved_interrupt_state->sp);    \
    }                                                           \
    CYG_MACRO_END
#endif

//--------------------------------------------------------------------------
// HAL setjmp

#define CYGARC_JMP_BUF_SIZE 16  // Actually 11, but some room left over

typedef cyg_uint32 hal_jmp_buf[CYGARC_JMP_BUF_SIZE];

externC int hal_setjmp(hal_jmp_buf env);
externC void hal_longjmp(hal_jmp_buf env, int val);


//--------------------------------------------------------------------------
// Idle thread code.
// This macro is called in the idle thread loop, and gives the HAL the
// chance to insert code. Typical idle thread behaviour might be to halt the
// processor.

externC void hal_idle_thread_action(cyg_uint32 loop_count);

#define HAL_IDLE_THREAD_ACTION(_count_) hal_idle_thread_action(_count_)

//---------------------------------------------------------------------------

// Minimal and sensible stack sizes: the intention is that applications
// will use these to provide a stack size in the first instance prior to
// proper analysis.  Idle thread stack should be this big.

//    THESE ARE NOT INTENDED TO BE MICROMETRICALLY ACCURATE FIGURES.
//           THEY ARE HOWEVER ENOUGH TO START PROGRAMMING.
// YOU MUST MAKE YOUR STACKS LARGER IF YOU HAVE LARGE "AUTO" VARIABLES!

// This is not a config option because it should not be adjusted except
// under "enough rope" sort of disclaimers.

// A minimal, optimized stack frame, rounded up - no autos
#define CYGNUM_HAL_STACK_FRAME_SIZE (4 * 20)

// Stack needed for a context switch: this is implicit in the estimate for
// interrupts so not explicitly used below:
#define CYGNUM_HAL_STACK_CONTEXT_SIZE (4 * 20)

// Interrupt + call to ISR, interrupt_end() and the DSR
#define CYGNUM_HAL_STACK_INTERRUPT_SIZE \
    ((4 * 20) + 2 * CYGNUM_HAL_STACK_FRAME_SIZE)

// Space for the maximum number of nested interrupts, plus room to call functions
#define CYGNUM_HAL_MAX_INTERRUPT_NESTING 4

#define CYGNUM_HAL_STACK_SIZE_MINIMUM \
        (CYGNUM_HAL_MAX_INTERRUPT_NESTING * CYGNUM_HAL_STACK_INTERRUPT_SIZE + \
         2 * CYGNUM_HAL_STACK_FRAME_SIZE)

#define CYGNUM_HAL_STACK_SIZE_TYPICAL \
        (CYGNUM_HAL_STACK_SIZE_MINIMUM + \
         16 * CYGNUM_HAL_STACK_FRAME_SIZE)

//--------------------------------------------------------------------------
// Macros for switching context between two eCos instances (jump from
// code in ROM to code in RAM or vice versa).
#define CYGARC_HAL_SAVE_GP()
#define CYGARC_HAL_RESTORE_GP()

#endif // CYGONCE_HAL_ARCH_H
// End of hal_arch.h