dl_start.s

来自「在高通的手机平台下,一个下载手机.bin文件到手机的flash中的工具,包含PC」· S 代码 · 共 140 行

;//===================================================
;                                         Edit History
; Date     Name      Description
;12/26/05  wufei.lin    Initial  the stack register and the memory
; 
;
;//=================================================================


;//============================================================================
;//
;//                  REGISTER DEFINITIONS
;//
;//============================================================================

;CPSR Control Masks 
PSR_Fiq_Mask    EQU     0x40
PSR_Irq_Mask    EQU     0x80

; Processor mode definitions 
PSR_Supervisor  EQU     0x13


;/*============================================================================
;
;                  STACK DEFINITIONS
;
;============================================================================*/


; Stack sizes
SVC_Stack_Size  EQU     0x200
    

        IMPORT |Load$$CODE$$Base|
        IMPORT |Image$$CODE$$Base|
        IMPORT |Image$$CODE$$Length|
        IMPORT |Image$$CODE$$ZI$$Base|
        IMPORT |Image$$CODE$$ZI$$Length|
        IMPORT svc_stack
        IMPORT  process_packets
        IMPORT  boot_ram_init

        EXPORT Load__CODE__Base
        EXPORT Image__CODE__Base
        EXPORT Image__CODE__Length
        EXPORT Image__CODE__ZI__Base
        EXPORT Image__CODE__ZI__Length
;/*============================================================================
;
;                  STARTUP CODE
;
;============================================================================*/


        IMPORT  process_packets

        EXPORT  __main

        AREA    StartHere, CODE, READONLY
        CODE32
__main
        ENTRY

;////////////////////////////////////////////////////////////////////////////////
;//
;// Name: blatox
;//
;// Description: Calls a function from ARM state without having to know whether that 
;//    that function is ARM or Thumb state code.
;//
;// Arguments: 
;//   destreg - The register that contains the address of the function to be called.
;//
;// Registers modified: lr
;//       
;// MODE: Any
;// STATE: ARM. Can call either ARM or Thumb state functions.
;//
;////////////////////////////////////////////////////////////////////////////////

;                                        // call a function without knowing if it is ARM or THUMB code
        MACRO
        blatox  $destreg
        ROUT

        tst     $destreg, #0x01         ;// Test for thumb mode call.

        ldrne   lr, =%1
        ldreq   lr, =%2
        bx      $destreg
1
        CODE16
        bx      pc
        ALIGN
        CODE32
2
        MEND

;//============================================================================
; Enter C code execution   
;wufei.lin add to initialize the stack 
        msr     CPSR_c, #PSR_Supervisor:OR:PSR_Irq_Mask:OR:PSR_Fiq_Mask
        ldr     r13, =svc_stack+SVC_Stack_Size

;wufei.lin add to Initial variable in ram
        ldr     r4, =boot_ram_init
        blatox  r4


        ldr     a1, =process_packets
        blatox  a1
        
     
      AREA    BOOTSYS_DATA, DATA, READONLY

        ; The $$ convention used by the linker is replaced to avoid the need
        ; for the -pcc option required by the ARM compiler when symbols that
        ; include $$ are used in 'C' code.

Load__CODE__Base
        DCD |Load$$CODE$$Base|

Image__CODE__Base
        DCD |Image$$CODE$$Base|

Image__CODE__Length
        DCD |Image$$CODE$$Length|

Image__CODE__ZI__Base
        DCD |Image$$CODE$$ZI$$Base|

Image__CODE__ZI__Length
        DCD |Image$$CODE$$ZI$$Length|

        END