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#*****************************************************************************
#*
#* Project: Generic include file for ARM startup
#* Filename: startup.inc
#* Date: 11.05.2004
#* Rights: Hitex Development Tools GmbH
#* Greschbachstr. 12
#* 76229 Karlsruhe
#*
#****************************************************************************
# *** Startup Code (executed after Reset) ***
# Standard definitions of Mode bits and Interrupt (I & F) flags in PSRs
.equ Mode_USR, 0x10
.equ Mode_FIQ, 0x11
.equ Mode_IRQ, 0x12
.equ Mode_SVC, 0x13
.equ Mode_ABT, 0x17
.equ Mode_UND, 0x1B
.equ Mode_SYS, 0x1F
.equ T_BIT, 0x20 /* when T bit is set, thumb mode active */
.equ F_BIT, 0x40 /* when F bit is set, FIQ is disabled */
.equ I_BIT, 0x80 /* when I bit is set, IRQ is disabled */
# ---------------------------------------------
# macro definition for stack memory reservation
# ---------------------------------------------
# use this macro to setup the stack
.macro setup_stack label1, size, mode_bits
.lcomm __range_\label1, (\size - 1) * 4
.global \label1
.lcomm \label1, 4
ldr r0, adr_\label1
msr CPSR_c, \mode_bits
mov r13, r0
.endm
# use this macro to define the label for the setup_stack mcaro!
.macro stack_adr label1
adr_\label1:
.word \label1
.endm
# ---------------------------------------------
# copy section
# use this macro to copy a section
# parameters:
# - individual name, used to create labels
# - source pointer
# - destination pointer
# - source pointer + length > end address of source
# ---------------------------------------------
.macro copy_section sec_name, source, destination, source_end
ldr R1, =\source
ldr R2, =\destination
ldr R3, =\source_end
_cplp_\sec_name:
cmp R1, R3
ldrlo R0, [R1], #4
strlo R0, [R2], #4
blo _cplp_\sec_name
.endm
# ---------------------------------------------
# copy section 2
# use this macro to copy a section
# parameters:
# - individual name, used to create labels
# - source pointer
# - destination pointer
# - destination pointer + length > end address of destination
# ---------------------------------------------
.macro copy_section2 sec_name, source, destination, destination_end
ldr R1, =\source
ldr R2, =\destination
ldr R3, =\destination_end
_cplp_\sec_name:
cmp R2, R3
ldrlo R0, [R1], #4
strlo R0, [R2], #4
blo _cplp_\sec_name
.endm
# ---------------------------------------------
# clear section
# use this macro to clear bss sections
# ---------------------------------------------
.macro clear_section sec_name, source, source_end
mov R0, #0
ldr R1, =\source
ldr R2, =\source_end
_cllp_\sec_name:
cmp R1, R2
strlo R0, [R1], #4
blo _cllp_\sec_name
.endm
# ---------------------------------------------
# examples how to use the macros
# ---------------------------------------------
# Setup stacks for the operating modes
# ---------------------------------------------
# setup_stack UND_Stack, UND_Stack_Size, #Mode_UND|I_BIT|F_BIT
# setup_stack SVC_Stack, SVC_Stack_Size, #Mode_SVC|I_BIT|F_BIT
# setup_stack ABT_Stack, ABT_Stack_Size, #Mode_ABT|I_BIT|F_BIT
# setup_stack FIQ_Stack, FIQ_Stack_Size, #Mode_FIQ|I_BIT|F_BIT
# setup_stack IRQ_Stack, IRQ_Stack_Size, #Mode_IRQ|I_BIT|F_BIT
# setup_stack USR_Stack, USR_Stack_Size, #Mode_USR
# ---------------------------------------------
# copy sections
# ---------------------------------------------
# copy code into internal ram
# copy_section code, __code_start__, RAM_Base_Boot, __code_end__
# Relocate .data section (Copy from ROM to RAM)
# copy_section data, __data_start__, __data_start__+RAM_Base_Boot, __data_end__
# ---------------------------------------------
# Clear .bss section
# ---------------------------------------------
# Clear .bss section (Zero init)
# clear_section bss, __bss_start__, __bss_end__
# ---------------------------------------------
# startup delay
# use this macro if you are working with an debugger
# the startup delay avoid problems while
# the application start before the debug interface
# becomes controled by the debugger
# ---------------------------------------------
# a goodf choice for the delay value is
# cpu clock / 100 with ATMEL controllers
# cpu clock / 40 with Philips controllers
.macro StartupDelay delay_value
ldr R1, =\delay_value
ldr R2, =0
__StartDelay:
sub R1, R1, #1
cmp R1, R2
bhi __StartDelay
.endm
# ---------------------------------------------
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