in_reset.s

uC/OS 使用gcc进行开发的例子,可以参考一下

                adr         r0, irqvec                  @  @ where to read values
                ldmia       r0!, {r1-r2}                @  read the vectors
                mov         r0, #(6*4)                  @  @ of the interrupt vector
                stmia       r0!, {r1-r2}                @  store them
    ENDIF
*/

/*    IF  :DEF: AT91EB01
@ - | -- Get the top of the SRAM
@ - | top <- InitMainSram()
*/
                stmfd       r13!, {lr}
                ldr         r0, =InitMainSram
                mov         lr, pc
                bx          r0
                ldmfd       r13!, {lr}
/*    ENDIF

    IF  :DEF: AT91DB01
@ - | -- Get the top of the SSRAM
@ - | top <- SSRAM_BASE
                ldr         r0, =SSRAM_LIMIT
    ENDIF

@ - | -- Save current CPSR and work registers
*/
                mrs         r12, cpsr

/* @ - | Get the size of the stacks */
                ldr         r2, =InitTableStack

/* @ - | Reserve debugger stack size */
                ldr         r3, [r2, #0]
                sub         r0, r0, r3

/*    IF  :LNOT::DEF:AT91_DEBUG_ANGEL

@ - | If (FIQ size defined)
*/
                ldr         r3, [r2, #0]
                teq         r3, #0
/* @ - | Then */
                beq         InitFiqEnd
/* @ - | | -- Set up Fast Interrupt mode and set FIQ stack */
                mov         r1, #ARM_MODE_FIQ | I_BIT | F_BIT
                msr         cpsr, r1
/* @ - | | FIQ_r13 <- top */
                mov         r13, r0
/* @ - | | top <- top - size_FIQ */
                sub         r0, r0, r3
/* @ - | Endif */
InitFiqEnd:

/*
@ - | If (IRQ size defined)
*/
                ldr         r3, [r2, #4]
                teq         r3, #0
/* @ - | Then */
                beq         InitIrqEnd
/* @ - | | -- Set up Interrupt mode and set IRQ stack */
                mov         r1, #ARM_MODE_IRQ | I_BIT | F_BIT
                msr         cpsr, r1
/* @ - | | IRQ_r13 <- top */
                mov         r13, r0
/* @ - | | top <- top - size_IRQ */
                sub         r0, r0, r3
/* @ - | Endif */
InitIrqEnd:

/*
    IF  :LNOT::DEF:AT91_DEBUG_ICE

@ - | If (SVC size defined)
*/
                ldr         r3, [r2, #8]
                teq         r3, #0
/* @ - | Then */
                beq         InitSvcEnd
/* @ - | | -- Set up Supervisor mode and set SVC stack */
                mov         r1, #ARM_MODE_SVC | I_BIT | F_BIT
                msr         cpsr, r1
/* @ - | | SVC_r13 <- top */
                mov         r13, r0
/* @ - | | top <- top - size_SVC */
                sub         r0, r0, r3
/* @ - | Endif */
InitSvcEnd:

/*    ENDIF
    ENDIF

@ - | If (ABORT size defined)
*/
                ldr         r3, [r2, #12]
                teq         r3, #0
/* @ - | Then */
                beq         InitAbortEnd
/* @ - | | -- Set up Abort mode and set ABORT stack */

                mov         r1, #ARM_MODE_ABORT | I_BIT | F_BIT
                msr         cpsr, r1
/* @ - | | Abort_r13 <- top */
                mov         r13, r0
/* @ - | | top <- top - size_ABORT */
                sub         r0, r0, r3
/* @ - | Endif */
InitAbortEnd:


/* @ - | If (UNDEF size defined) */
                ldr         r3, [r2, #16]
                teq         r3, #0
/* @ - | Then */
                beq         InitUndefEnd
/* @ - | | -- Set up Undefined mode and set UNDEF stack */
                mov         r1, #ARM_MODE_UNDEF | I_BIT | F_BIT
                msr         cpsr, r1
/* @ - | | UNDEF_r13 <- top */
                mov         r13, r0
/* @ - | | top <- top - size_UNDEF */
                sub         r0, r0, r3
/* @ - | Endif */
InitUndefEnd:

/* @ - | -- Set up USER/SYStem mode and set USER/SYStem stack */
                mov         r1, #ARM_MODE_SYS | I_BIT | F_BIT
                msr         cpsr, r1
/* @ - | r13 <- top */
                mov         r13, r0

/* @ - | -- Restore current CPSR enabling interrupt and fast interrupt */
                bic         r12, r12, #I_BIT | F_BIT
                msr         cpsr, r12

/* @ - | return */
                bx          lr

/*
@ ------------------------------------------------------------------------------
@ -    ATMEL Microcontroller Software Support  -   ROUSSET -
@ ------------------------------------------------------------------------------
@  The software is delivered "AS IS" without warranty or condition of any
@  kind, either express, implied or statutory. This includes without
@  limitation any warranty or condition with respect to merchantability or
@  fitness for any particular purpose, or against the infringements of
@  intellectual property rights of others.
@ -----------------------------------------------------------------------------
@ - File source          : in_eb01.s
@ - Object               : table for AT91EB01 initialization
@ - Translator           : ARM Software Development Toolkit V2.11a
@ -
@ - Exported Resources   : InitTableEBI - InitTableStack
@ - Imported Resources   : None
@ -
@ - 1.0 15/09/98 JLV     : Creation
@ - 2.0 21/10/98 JCZ     : Clean up.
@ - 2.1 16/03/99 JCZ     : SDT V2.5
@ -                      : Reserve stack space on top of memory for ICE Debug.
@ ------------------------------------------------------------------------------

            AREA        Init, CODE, READONLY

@  -------------------------- List of Included Files ---------------------------

@             INCLUDE     Include/ebi.inc
*/

	EBI_BASE        =     0xFFE00000

/* @  -------------------------- List of Macro definitions ------------------------ */

/*            MACRO
            STACK_SIZE  $debug, $fiq, $irq, $svc, $abort, $undef

            DCD     $debug*4
            DCD     $fiq*4
            DCD     $irq*4
            DCD     $svc*4
            DCD     $abort*4
            DCD     $undef*4

            MEND
*/            
            .macro	STACK_SIZE  debug, fiq, irq, svc, abort, undef

            .word     \debug*4
            .word     \fiq*4
            .word     \irq*4
            .word     \svc*4
            .word     \abort*4
            .word     \undef*4

            .endm
            
/*
@  ------------------------ List of constants and types ------------------------
@  None

@  ------------------------ List of Imported resources -------------------------
@  None

@  ------------------------ List of Internal resources -------------------------
@  None

@  ------------------------ List of Exported resources -------------------------

    IF  :DEF:AT91_DEBUG_NONE

@ ------------------------------------------------------------------------------
@ - Function             : InitTableEBI
@ - Treatments           : Table for EBI initialization
@ - Input Parameters     : None
@ - Output Parameters    : None
@ - Registers lost       : None
@ - Called Functions     : None
@ - Called Macros        : None
@ ------------------------------------------------------------------------------

@                 .global      InitTableEBI
@  32,768 MHz master clock assumed
*/

InitTableEBI:
            .word         0x01002535  @  0x01000000, 16MB, 2 hold, 16 bits, 6 WS
            .word         0x02002121  @  0x02000000, 16MB, 0 hold, 16 bits, 1 WS
            .word         0x20000000  @  unused
            .word         0x30000000  @  unused
            .word         0x40000000  @  unused
            .word         0x50000000  @  unused
            .word         0x60000000  @  unused
            .word         0x70000000  @  unused
            .word         0x00000001  @  REMAP command
            .word         0x00000006  @  7 memory regions, standard read
            .word         EBI_BASE    @  EBI Base address

/*    ENDIF 

@ ------------------------------------------------------------------------------
@ - Function             : InitTableStack
@ - Treatments           : Table for stack initialization ( stack sizes)
@ - Input Parameters     : None
@ - Output Parameters    : None
@ - Registers lost       : None
@ - Called Functions     : None
@ - Called Macros        : None
@ ------------------------------------------------------------------------------

@                 .global      InitTableStack
*/

InitTableStack:
/*    IF  :DEF:AT91_DEBUG_NONE
*/
            STACK_SIZE  0, 3, 3*8, 256, 3, 3
/*    ENDIF
    IF  :DEF:AT91_DEBUG_ANGEL
            STACK_SIZE  0, 0, 0, 0, 0, 0
    ENDIF
    IF  :DEF:AT91_DEBUG_ICE
            STACK_SIZE  1024, 3, 3*8, 0, 3, 3
    ENDIF

            END
*/