You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
224 lines
8.1 KiB
Plaintext
224 lines
8.1 KiB
Plaintext
;------------------------------------------------------------------------------
|
|
;- 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
|
|
;------------------------------------------------------------------------------
|
|
|
|
#include "AT91SAM7S64_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
|
|
|
|
EXTERN vPortYieldProcessor
|
|
|
|
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 vPortYieldProcessor ; 0x08 Software Interrupt
|
|
pabtvec:
|
|
B pabtvec ; 0x0C Prefetch Abort
|
|
dabtvec:
|
|
B dabtvec ; 0x10 Data Abort
|
|
rsvdvec:
|
|
B rsvdvec ; 0x14 reserved
|
|
irqvec:
|
|
LDR PC, [PC, #-0xF20] ; Jump directly to the address given by the AIC
|
|
|
|
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 300
|
|
|
|
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
|
|
|
|
|
|
|
|
;---------------------------------------------------------------
|
|
; ?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
|
|
|