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jeremybenn |
/******************************************************************
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*** ***
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*** crt0 for __BELOW100__ attribute test with SID ***
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*** ***
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******************************************************************/
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/*************************************/
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/** Interrupt vectors at 0x8000 **/
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/*************************************/
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.section .int_vec,"ax"
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.global _start
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.align 1
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_start:
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jmpf _int_reset
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//jmpf _int_basetimer
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//jmpf _int_timer0
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//jmpf _int_timer1
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//jmpf _int_irq_4
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//jmpf _int_irq_5
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//jmpf _int_port0
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//jmpf _int_port1
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//jmpf _int_irq_8
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//jmpf _int_irq_9
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//jmpf _int_irq_a
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//jmpf _int_irq_b
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//jmpf _int_irq_c
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//jmpf _int_irq_d
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//jmpf _int_irq_e
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//jmpf _int_irq_f
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/*************************************/
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/** reset code **/
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/*************************************/
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.text
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_int_reset:
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/*************************************/
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/** setup stack pointer **/
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/*************************************/
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mov sp,#__stack
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/*************************************/
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/** zero .bss section **/
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/*************************************/
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mov r0,#__bss_start
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mov r1,#__bss_end
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mov r2,#0
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1: mov.w (r0++),r2
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blt r0,r1,1b
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/*************************************/
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/** copy inital value for .data **/
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/*************************************/
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mov r1,#__data_start
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mov r3,#__data_end
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mov r0,#@lo(__rdata)
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mov r8,#@hi(__rdata)
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2: movf.w r2,(r0++)
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bnz r0,#0,3f
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add r8,#1
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3: mov.w (r1++),r2
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blt r1,r3,2b
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/*************************************/
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/** call hardware init routine **/
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/*************************************/
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callf _hwinit
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/*************************************/
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/** call initializaton routines **/
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/*************************************/
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callf _init
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/*************************************/
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/** setup fini routines to be **/
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/** called from exit **/
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/*************************************/
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mov r2,#@fptr(_fini)
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callf atexit
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/*************************************/
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/** call main() with empty **/
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/** argc/argv/envp **/
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/*************************************/
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mov r2,#0
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mov r3,#0
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mov r4,#0
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callf main
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/*************************************/
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/** return from main() **/
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/*************************************/
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callf exit
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/*************************************/
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/** should never reach this code **/
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/*************************************/
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jmpf _start
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/*************************************/
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/** default h/w initialize routine **/
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/** and default _init/_finit for **/
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/** -nostartfiles option **/
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/*************************************/
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.globl _hwinit
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.weak _hwinit
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_hwinit:
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.globl _init
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.weak _init
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_init:
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.globl _fini
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.weak _fini
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_fini:
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ret
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/******************************************************************
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*******************************************************************
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*** ***
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*** Chip information data for LC59_32K ***
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*** Written by T.Matsukawa ***
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*** ***
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*******************************************************************
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******************************************************************/
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/*************************************/
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/** Define convenient macros **/
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/*************************************/
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#define BCD(x) (((x)/10)%10)*0x10+((x)%10)
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#define BCD4(x) BCD((x)/100),BCD(x)
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#define BCD6(x) BCD((x)/10000),BCD((x)/100),BCD(x)
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/*************************************/
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/** Define memory sizes **/
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/*************************************/
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#define RAM_SIZE 0x7E00
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#define ROM_SIZE 0x78000
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#define VRAM_SIZE 0x0000
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#define VRAM_ROW 0
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#define VRAM_COLUMN 0
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#define CGROM_SIZE 0x0000
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#define PROTECT_SIZE 0x0000
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/*************************************/
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/** section ".chip_info" **/
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/*************************************/
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.section .chip_info,"a"
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.space 0xb8,0x00
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/*************************************/
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/** B8-BB : User option address **/
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/*************************************/
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.word 0x00000
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.global __reset_vector
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#if 0x00000==0
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.equ __reset_vector,0x08000
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#else
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.equ __reset_vector,0x00000
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#endif
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/*************************************/
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/** BC-BF : Flash Protect address **/
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/*************************************/
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#if PROTECT_SIZE==0
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.word 0x00000000
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#else
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.word 0x08000+ROM_SIZE-PROTECT_SIZE
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#endif
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/*************************************/
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/** C0-CF : Fixed string **/
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/*************************************/
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1: .ascii "CHIPINFORMATION"
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2: .space (0x10-(2b-1b)),0x00
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/*************************************/
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/** D0-DF : Chipname **/
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/*************************************/
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1: .ascii "LC59_32K"
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2: .space (0x10-(2b-1b)),0x00
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/*************************************/
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/** E0-E1 : Format version(BCD4) **/
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/*************************************/
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.byte 0x10, 0x00
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.space 6, 0x00
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/*************************************/
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/** E8-F5 : Memory sizes **/
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/*************************************/
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.byte BCD4(ROM_SIZE/1024)
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.byte BCD6(RAM_SIZE)
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.byte BCD6(VRAM_SIZE)
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.byte BCD4(VRAM_ROW)
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.byte BCD4(VRAM_COLUMN)
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.byte BCD4(CGROM_SIZE/1024)
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.space 3, 0x00
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/*************************************/
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/** F9 : Package type **/
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/*************************************/
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.byte 0xff
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.space 6, 0x00
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/*************************************/
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/** In order to link BIOS in library**/
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/*************************************/
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.equ dummy,__bios_entry
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