/*
IAR startup file for AT91SAM9XE microcontrollers.
*/

MODULE ?cstartup

;; Forward declaration of sections.
SECTION IRQ_STACK:DATA:NOROOT(2)
SECTION CSTACK:DATA:NOROOT(3)

//------------------------------------------------------------------------------
// Headers
//------------------------------------------------------------------------------

#define __ASSEMBLY__
#include "board.h"

//------------------------------------------------------------------------------
// Definitions
//------------------------------------------------------------------------------

#define ARM_MODE_ABT 0x17
#define ARM_MODE_FIQ 0x11
#define ARM_MODE_IRQ 0x12
#define ARM_MODE_SVC 0x13
#define ARM_MODE_SYS 0x1F

#define I_BIT 0x80
#define F_BIT 0x40

//------------------------------------------------------------------------------
// Startup routine
//------------------------------------------------------------------------------

/*
Exception vectors
*/
SECTION .vectors:CODE:NOROOT(2)

PUBLIC resetVector
PUBLIC irqHandler

EXTERN Undefined_Handler
EXTERN SWI_Handler
EXTERN Prefetch_Handler
EXTERN Abort_Handler
EXTERN FIQ_Handler

ARM

__iar_init$$done: ; The interrupt vector is not needed
; until after copy initialization is done

resetVector:
; All default exception handlers (except reset) are
; defined as weak symbol definitions.
; If a handler is defined by the application it will take precedence.
LDR pc, =resetHandler ; Reset
LDR pc, Undefined_Addr ; Undefined instructions
LDR pc, SWI_Addr ; Software interrupt (SWI/SYS)
LDR pc, Prefetch_Addr ; Prefetch abort
LDR pc, Abort_Addr ; Data abort
B . ; RESERVED
LDR pc, =irqHandler ; IRQ
LDR pc, FIQ_Addr ; FIQ

Undefined_Addr: DCD Undefined_Handler
SWI_Addr: DCD SWI_Handler
Prefetch_Addr: DCD Prefetch_Handler
Abort_Addr: DCD Abort_Handler
FIQ_Addr: DCD FIQ_Handler

/*
Handles incoming interrupt requests by branching to the corresponding
handler, as defined in the AIC. Supports interrupt nesting.
*/
irqHandler:
/* Save interrupt context on the stack to allow nesting */
SUB lr, lr, #4
STMFD sp!, {lr}
MRS lr, SPSR
STMFD sp!, {r0, lr}

/* Write in the IVR to support Protect Mode */
LDR lr, =AT91C_BASE_AIC
LDR r0, [r14, #AIC_IVR]
STR lr, [r14, #AIC_IVR]

/* Branch to interrupt handler in Supervisor mode */
MSR CPSR_c, #ARM_MODE_SYS
STMFD sp!, {r1-r3, r4, r12, lr}
BLX r0
LDMIA sp!, {r1-r3, r4, r12, lr}
MSR CPSR_c, #ARM_MODE_IRQ | I_BIT

/* Acknowledge interrupt */
LDR lr, =AT91C_BASE_AIC
STR lr, [r14, #AIC_EOICR]

/* Restore interrupt context and branch back to calling code */
LDMIA sp!, {r0, lr}
MSR SPSR_cxsf, lr
LDMIA sp!, {pc}^


/*
After a reset, execution starts here, the mode is ARM, supervisor
with interrupts disabled.
Initializes the chip and branches to the main() function.
*/
SECTION .cstartup:CODE:NOROOT(2)

PUBLIC resetHandler
EXTERN LowLevelInit
EXTERN ?main
REQUIRE resetVector
ARM

resetHandler:

/* Set pc to actual code location (i.e. not in remap zone) */
LDR pc, =label

/* Perform low-level initialization of the chip using LowLevelInit() */
label:
LDR r0, =LowLevelInit
LDR r4, =SFE(CSTACK)
MOV sp, r4
BLX r0

/* Set up the interrupt stack pointer. */
MSR cpsr_c, #ARM_MODE_IRQ | I_BIT | F_BIT ; Change the mode
LDR sp, =SFE(IRQ_STACK)

/* Set up the SYS stack pointer. */
MSR cpsr_c, #ARM_MODE_SYS | F_BIT ; Change the mode
LDR sp, =SFE(CSTACK)

/* Branch to main() */
LDR r0, =?main
BLX r0

/* Loop indefinitely when program is finished */
loop4:
B loop4

END




Cstartup.s79:

;------------------------------------------------------------------------------
;- 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 : Cstartup.s79
;- Object : Generic CStartup for IAR No Use REMAP
;- Compilation flag : None
;-
;- 1.0 15/Jun/04 JPP : Creation
;- 1.1 01/Apr/05 JPP : save SPSR
;------------------------------------------------------------------------------

#include "AT91SAM7S32_inc.h"

;------------------------------------------------------------------------------
;- Area Definition
;------------------------------------------------------------------------------

;---------------------------------------------------------------
; ?RESET
; Reset Vector.
; Normally, segment INTVEC is linked at address 0.
; For debugging purposes, INTVEC may be placed at other
; addresses.
; A debugger that honors the entry point will start the
; program in a normal way even if INTVEC is not at address 0.
;-------------------------------------------------------------

PROGRAM ?RESET
RSEG INTRAMSTART_REMAP
RSEG INTRAMEND_REMAP

RSEG ICODE:CODE:ROOT(2)
CODE32 ; Always ARM mode after reset
org 0
reset
;------------------------------------------------------------------------------
;- Exception vectors
;--------------------
;- These vectors can be read at address 0 or at RAM address
;- They ABSOLUTELY requires to be in relative addresssing mode in order to
;- guarantee a valid jump. For the moment, all are just looping.
;- If an exception occurs before remap, this would result in an infinite loop.
;- To ensure if a exeption occurs before start application to infinite loop.
;------------------------------------------------------------------------------

B InitReset ; 0x00 Reset handler
undefvec:
B undefvec ; 0x04 Undefined Instruction
swivec:
B swivec ; 0x08 Software Interrupt
pabtvec:
B pabtvec ; 0x0C Prefetch Abort
dabtvec:
B dabtvec ; 0x10 Data Abort
rsvdvec:
B rsvdvec ; 0x14 reserved
irqvec:
B IRQ_Handler_Entry ; 0x18 IRQ
fiqvec: ; 0x1c FIQ
;------------------------------------------------------------------------------
;- Function : FIQ_Handler_Entry
;- Treatments : FIQ Controller Interrupt Handler.
;- Called Functions : AIC_FVR[interrupt]
;------------------------------------------------------------------------------

FIQ_Handler_Entry:

;- Switch in SVC/User Mode to allow User Stack access for C code
; because the FIQ is not yet acknowledged

;- Save and r0 in FIQ_Register
mov r9,r0
ldr r0 , [r8, #AIC_FVR]
msr CPSR_c,#I_BIT | F_BIT | ARM_MODE_SVC
;- Save scratch/used registers and LR in User Stack
stmfd sp!, { r1-r3, r12, lr}

;- Branch to the routine pointed by the AIC_FVR
mov r14, pc
bx r0

;- Restore scratch/used registers and LR from User Stack
ldmia sp!, { r1-r3, r12, lr}

;- Leave Interrupts disabled and switch back in FIQ mode
msr CPSR_c, #I_BIT | F_BIT | ARM_MODE_FIQ

;- Restore the R0 ARM_MODE_SVC register
mov r0,r9

;- Restore the Program Counter using the LR_fiq directly in the PC
subs pc,lr,#4


InitReset:
;------------------------------------------------------------------------------
;- Low level Init (PMC, AIC, ? ....) by C function AT91F_LowLevelInit
;------------------------------------------------------------------------------
EXTERN AT91F_LowLevelInit

#define __iramend SFB(INTRAMEND_REMAP)

;- minumum C initialization
;- call AT91F_LowLevelInit( void)

ldr r13,=__iramend ; temporary stack in internal RAM
;--Call Low level init function in ABSOLUTE through the Interworking
ldr r0,=AT91F_LowLevelInit
mov lr, pc
bx r0

;------------------------------------------------------------------------------
;- Stack Sizes Definition
;------------------------
;- Interrupt Stack requires 2 words x 8 priority level x 4 bytes when using
;- the vectoring. This assume that the IRQ management.
;- The Interrupt Stack must be adjusted depending on the interrupt handlers.
;- Fast Interrupt not requires stack If in your application it required you must
;- be definehere.
;- The System stack size is not defined and is limited by the free internal
;- SRAM.
;------------------------------------------------------------------------------

;------------------------------------------------------------------------------
;- Top of Stack Definition
;-------------------------
;- Interrupt and Supervisor Stack are located at the top of internal memory in
;- order to speed the exception handling context saving and restoring.
;- ARM_MODE_SVC (Application, C) Stack is located at the top of the external memory.
;------------------------------------------------------------------------------

IRQ_STACK_SIZE EQU (3*8*4) ; 3 words per interrupt priority level

ARM_MODE_FIQ EQU 0x11
ARM_MODE_IRQ EQU 0x12
ARM_MODE_SVC EQU 0x13

I_BIT EQU 0x80
F_BIT EQU 0x40

;------------------------------------------------------------------------------
;- Setup the stack for each mode
;-------------------------------
ldr r0, =__iramend

;- Set up Fast Interrupt Mode and set FIQ Mode Stack
msr CPSR_c, #ARM_MODE_FIQ | I_BIT | F_BIT
;- Init the FIQ register
ldr r8, =AT91C_BASE_AIC

;- Set up Interrupt Mode and set IRQ Mode Stack
msr CPSR_c, #ARM_MODE_IRQ | I_BIT | F_BIT
mov r13, r0 ; Init stack IRQ
sub r0, r0, #IRQ_STACK_SIZE

;- Enable interrupt & Set up Supervisor Mode and set Supervisor Mode Stack
msr CPSR_c, #ARM_MODE_SVC
mov r13, r0


;---------------------------------------------------------------
; ?CSTARTUP
;---------------------------------------------------------------
EXTERN __segment_init
EXTERN main
; Initialize segments.
; __segment_init is assumed to use
; instruction set and to be reachable by BL from the ICODE segment
; (it is safest to link them in segment ICODE).
ldr r0,=__segment_init
mov lr, pc
bx r0

PUBLIC __main
?jump_to_main:
ldr lr,=?call_exit
ldr r0,=main
__main:
bx r0

;------------------------------------------------------------------------------
;- Loop for ever
;---------------
;- End of application. Normally, never occur.
;- Could jump on Software Reset ( B 0x0 ).
;------------------------------------------------------------------------------
?call_exit:
End
b End


;------------------------------------------------------------------------------
;- Manage exception
;---------------
;- This module The exception must be ensure in ARM mode
;------------------------------------------------------------------------------
;------------------------------------------------------------------------------
;- Function : IRQ_Handler_Entry
;- Treatments : IRQ Controller Interrupt Handler.
;- Called Functions : AIC_IVR[interrupt]
;------------------------------------------------------------------------------
IRQ_Handler_Entry:

;- Manage Exception Entry
;- Adjust and save LR_irq in IRQ stack
sub lr, lr, #4
stmfd sp!, {lr}

;- Save SPSR need to be saved for nested interrupt
mrs r14, SPSR
stmfd sp!, {r14}

;- Save and r0 in IRQ stack
stmfd sp!, {r0}

;- Write in the IVR to support Protect Mode
;- No effect in Normal Mode
;- De-assert the NIRQ and clear the source in Protect Mode
ldr r14, =AT91C_BASE_AIC
ldr r0 , [r14, #AIC_IVR]
str r14, [r14, #AIC_IVR]

;- Enable Interrupt and Switch in Supervisor Mode
msr CPSR_c, #ARM_MODE_SVC

;- Save scratch/used registers and LR in User Stack
stmfd sp!, { r1-r3, r12, r14}

;- Branch to the routine pointed by the AIC_IVR
mov r14, pc
bx r0

;- Restore scratch/used registers and LR from User Stack
ldmia sp!, { r1-r3, r12, r14}

;- Disable Interrupt and switch back in IRQ mode
msr CPSR_c, #I_BIT | ARM_MODE_IRQ

;- Mark the End of Interrupt on the AIC
ldr r14, =AT91C_BASE_AIC
str r14, [r14, #AIC_EOICR]

;- Restore R0
ldmia sp!, {r0}

;- Restore SPSR_irq and r0 from IRQ stack
ldmia sp!, {r14}
msr SPSR_cxsf, r14

;- Restore adjusted LR_irq from IRQ stack directly in the PC
ldmia sp!, {pc}^
;---------------------------------------------------------------
; ?EXEPTION_VECTOR
; This module is only linked if needed for closing files.
;---------------------------------------------------------------
PUBLIC AT91F_Default_FIQ_handler
PUBLIC AT91F_Default_IRQ_handler
PUBLIC AT91F_Spurious_handler

CODE32 ; Always ARM mode after exeption

AT91F_Default_FIQ_handler
b AT91F_Default_FIQ_handler

AT91F_Default_IRQ_handler
b AT91F_Default_IRQ_handler

AT91F_Spurious_handler
b AT91F_Spurious_handler

ENDMOD

END

;- Set up Fast Interrupt Mode and set FIQ Mode Stack
                msr     CPSR_c, #ARM_MODE_FIQ | I_BIT | F_BIT
;- Init the FIQ register
                ldr     r8, =AT91C_BASE_AIC

;- Set up Fast Interrupt Mode and set FIQ Mode Stack
                msr     CPSR_c, #ARM_MODE_FIQ | I_BIT | F_BIT
;- Init the FIQ register
                ldr     r8, =AT91C_BASE_AIC

label:
        LDR     r0, =LowLevelInit
        LDR     r4, =SFE(CSTACK)
        MOV     sp, r4
        MOV     lr, pc
        BX      r0

        /* Set up Fast Interrupt Mode and set FIQ Mode Stack */
        msr     CPSR_c, #ARM_MODE_FIQ | I_BIT | F_BIT
        /* Init the FIQ register */
        ldr     r8, =AT91C_BASE_AIC
                
        /* Set up the interrupt stack pointer. */
        MSR     cpsr_c, #ARM_MODE_IRQ | I_BIT | F_BIT     ; Change the mode
        LDR     sp, =SFE(IRQ_STACK)

        /* Set up the SVC stack pointer. */
        MSR     cpsr_c, #ARM_MODE_SVC | F_BIT             ; Change the mode
        LDR     sp, =SFE(CSTACK)


Building configuration: at91sam9xe-ek - at91sam9xe256_sram
Updating build tree...
board_cstartup_iar.s
Linking
Error[Lp002]: relocation failed: out of range or illegal value
     Kind    : R_ARM_LDR_PC_G0[0x4]
     Location: mem:0x304ff4
               "resetHandler" + 0x1c
               Module:  D:\Stas\Atmel\cc2400_arm9_1\at91sam9xe-ek\usb-device-core-project\ewp\at91sam9xe256_sram\Obj\board_cstartup_iar.o
               Section: 9 (.cstartup)
               Offset:  0x1c
     Target  : mem:0x300000
               "resetVector"
               Module:  D:\Stas\Atmel\cc2400_arm9_1\at91sam9xe-ek\usb-device-core-project\ewp\at91sam9xe256_sram\Obj\board_cstartup_iar.o
               Section: 8 (.vectors)
               Offset:  0x0
Error while running Linker

ldr     PC, [PC,# -0xF20]      ;AIC direct