147 lines
5.0 KiB
ArmAsm
147 lines
5.0 KiB
ArmAsm
;;; Startup variant, change attribute value if you make your own
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.rtmodel cstartup,"sentinel65x"
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.rtmodel version, "1"
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.rtmodel core, "*"
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.section stack
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.section cstack
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.section heap
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.section data_init_table
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.extern main, exit
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.extern _Dp, _Vfp
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.extern _DirectPageStart
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#ifndef __CALYPSI_DATA_MODEL_SMALL__
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.extern _NearBaseAddress
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#endif
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#include "macros.h"
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;;; ***************************************************************************
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;;;
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;;; The reset vector. This uses the entry point label __program_root_section
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;;; which by default is what the linker will pull in first.
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;;;
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;;; ***************************************************************************
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.section reset
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.pubweak __program_root_section
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__program_root_section:
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.word __program_start
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;;; ***************************************************************************
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;;;
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;;; __program_start - actual start point of the program
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;;;
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;;; Set up CPU stack, initialize sections and call main().
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;;; You can override this with your own routine, or tailor it as needed.
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;;; The easiest way to make custom initialization is to provide your own
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;;; __low_level_init which gets called after stacks have been initialized.
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;;;
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;;; ***************************************************************************
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#ifdef __CALYPSI_CODE_MODEL_COMPACT__
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.section boot
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#else
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.section boot, noreorder
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#endif
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.asciz "WDC"
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.pubweak __program_start
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__program_start:
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clc
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xce ; native 16-bit mode
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rep #0x38 ; 16-bit registers, no decimal mode
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ldx ##.sectionEnd stack
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txs ; set stack
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lda ##_DirectPageStart
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tcd ; set direct page
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#ifdef __CALYPSI_DATA_MODEL_SMALL__
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lda ##0
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#else
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lda ##.word2 _NearBaseAddress
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#endif
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stz dp:.tiny(_Vfp+2)
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xba ; A upper half = data bank
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pha
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plb ; pop 8 dummy
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plb ; set data bank
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#ifdef __CALYPSI_CODE_MODEL_COMPACT__
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jmp long:_Trampoline_program_start
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.section compactcode, noreorder
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_Trampoline_program_start:
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#define CODE compactcode
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#else
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#define CODE code
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#endif
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call __low_level_init
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;;; **** Initialize data sections if needed.
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.section CODE, noroot, noreorder
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.pubweak __data_initialization_needed
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.extern __initialize_sections
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__data_initialization_needed:
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lda ##.word2 (.sectionEnd data_init_table)
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sta dp:.tiny(_Dp+6)
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lda ##.word0 (.sectionEnd data_init_table)
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sta dp:.tiny(_Dp+4)
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lda ##.word2 (.sectionStart data_init_table)
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sta dp:.tiny(_Dp+2)
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lda ##.word0 (.sectionStart data_init_table)
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sta dp:.tiny(_Dp+0)
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call __initialize_sections
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;;; **** Initialize streams if needed.
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.section CODE, noroot, noreorder
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.pubweak __call_initialize_global_streams
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.extern __initialize_global_streams
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__call_initialize_global_streams:
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call __initialize_global_streams
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;;; **** Initialize heap if needed.
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.section CODE, noroot, noreorder
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.pubweak __call_heap_initialize
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.extern __heap_initialize, __default_heap
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__call_heap_initialize:
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#ifdef __CALYPSI_DATA_MODEL_SMALL__
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lda ##.sectionSize heap
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sta dp:.tiny(_Dp+2)
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lda ##.sectionStart heap
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sta dp:.tiny(_Dp+0)
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lda ##__default_heap
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#else
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lda ##.word2 (.sectionStart heap)
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sta dp:.tiny(_Dp+6)
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lda ##.word0 (.sectionStart heap)
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sta dp:.tiny(_Dp+4)
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lda ##.word2 __default_heap
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sta dp:.tiny(_Dp+2)
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lda ##.word0 __default_heap
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sta dp:.tiny(_Dp+0)
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ldx ##.word2 (.sectionSize heap)
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lda ##.word0 (.sectionSize heap)
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#endif
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call __heap_initialize
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.section CODE, root, noreorder
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lda ##0 ; argc = 0
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call main
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jump exit
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;;; ***************************************************************************
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;;;
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;;; __low_level_init - custom low level initialization
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;;;
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;;; This default routine just returns doing nothing. You can provide your own
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;;; routine, either in C or assembly for doing custom low leve initialization.
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;;;
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;;; ***************************************************************************
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.section libcode
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.pubweak __low_level_init
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__low_level_init:
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return
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