por eletroinf » 15 Ago 2007 08:21
O Makefile é o seguinte (lembrando que esse programa eu peguei da lista yahoo gnuarm, só importei ele no Eclipse):
NAME = demo2148_blink_flash
CC = arm-elf-gcc
LD = arm-elf-ld -v
AR = arm-elf-ar
AS = arm-elf-as
CP = arm-elf-objcopy
OD = arm-elf-objdump
CFLAGS = -I./ -c -fno-common -O0 -g
AFLAGS = -ahls -mapcs-32 -o crt.o
LFLAGS = -Map main.map -Tdemo2129_blink_flash.cmd
CPFLAGS = -O ihex
ODFLAGS = -x --syms
all: test
clean:
-rm crt.lst main.lst crt.o main.o main.out main.hex main.map main.dmp
test: main.out
@ echo "...copying"
$(CP) $(CPFLAGS) main.out main.hex
$(OD) $(ODFLAGS) main.out > main.dmp
main.out: crt.o main.o demo2129_blink_flash.cmd
@ echo "..linking"
$(LD) $(LFLAGS) -o main.out crt.o main.o
crt.o: crt.s
@ echo ".assembling"
$(AS) $(AFLAGS) crt.s > crt.lst
main.o: main.c
@ echo ".compiling"
$(CC) $(CFLAGS) main.c
/************************************************/
Agora o arquivo crt.s
/* ***************************************************************************************************************
crt.s STARTUP ASSEMBLY CODE
-----------------------
Module includes the interrupt vectors and start-up code.
*************************************************************************************************************** */
/* Stack Sizes */
.set UND_STACK_SIZE, 0x00000004 /* stack for "undefined instruction" interrupts is 4 bytes */
.set ABT_STACK_SIZE, 0x00000004 /* stack for "abort" interrupts is 4 bytes */
.set FIQ_STACK_SIZE, 0x00000004 /* stack for "FIQ" interrupts is 4 bytes */
.set IRQ_STACK_SIZE, 0X00000004 /* stack for "IRQ" normal interrupts is 4 bytes */
.set SVC_STACK_SIZE, 0x00000004 /* stack for "SVC" supervisor mode is 4 bytes */
/* Standard definitions of Mode bits and Interrupt (I & F) flags in PSRs (program status registers) */
.set MODE_USR, 0x10 /* Normal User Mode */
.set MODE_FIQ, 0x11 /* FIQ Processing Fast Interrupts Mode */
.set MODE_IRQ, 0x12 /* IRQ Processing Standard Interrupts Mode */
.set MODE_SVC, 0x13 /* Supervisor Processing Software Interrupts Mode */
.set MODE_ABT, 0x17 /* Abort Processing memory Faults Mode */
.set MODE_UND, 0x1B /* Undefined Processing Undefined Instructions Mode */
.set MODE_SYS, 0x1F /* System Running Priviledged Operating System Tasks Mode */
.set I_BIT, 0x80 /* when I bit is set, IRQ is disabled (program status registers) */
.set F_BIT, 0x40 /* when F bit is set, FIQ is disabled (program status registers) */
.text
.arm
.global Reset_Handler
.global _startup
.func _startup
_startup:
# Exception Vectors
_vectors: ldr PC, Reset_Addr
ldr PC, Undef_Addr
ldr PC, SWI_Addr
ldr PC, PAbt_Addr
ldr PC, DAbt_Addr
nop /* Reserved Vector (holds Philips ISP checksum) */
ldr PC, [PC,#-0xFF0] /* see page 71 of "Insiders Guide to the Philips ARM7-Based Microcontrollers" by Trevor Martin */
ldr PC, FIQ_Addr
Reset_Addr: .word Reset_Handler /* defined in this module below */
Undef_Addr: .word UNDEF_Routine /* defined in main.c */
SWI_Addr: .word SWI_Routine /* defined in main.c */
PAbt_Addr: .word UNDEF_Routine /* defined in main.c */
DAbt_Addr: .word UNDEF_Routine /* defined in main.c */
IRQ_Addr: .word IRQ_Routine /* defined in main.c */
FIQ_Addr: .word FIQ_Routine /* defined in main.c */
.word 0 /* rounds the vectors and ISR addresses to 64 bytes total */
# Reset Handler
Reset_Handler:
/* Setup a stack for each mode - note that this only sets up a usable stack
for User mode. Also each mode is setup with interrupts initially disabled. */
ldr r0, =_stack_end
msr CPSR_c, #MODE_UND|I_BIT|F_BIT /* Undefined Instruction Mode */
mov sp, r0
sub r0, r0, #UND_STACK_SIZE
msr CPSR_c, #MODE_ABT|I_BIT|F_BIT /* Abort Mode */
mov sp, r0
sub r0, r0, #ABT_STACK_SIZE
msr CPSR_c, #MODE_FIQ|I_BIT|F_BIT /* FIQ Mode */
mov sp, r0
sub r0, r0, #FIQ_STACK_SIZE
msr CPSR_c, #MODE_IRQ|I_BIT|F_BIT /* IRQ Mode */
mov sp, r0
sub r0, r0, #IRQ_STACK_SIZE
msr CPSR_c, #MODE_SVC|I_BIT|F_BIT /* Supervisor Mode */
mov sp, r0
sub r0, r0, #SVC_STACK_SIZE
msr CPSR_c, #MODE_SYS|I_BIT|F_BIT /* User Mode */
mov sp, r0
/* copy .data section (Copy from ROM to RAM) */
ldr R1, =_etext
ldr R2, =_data
ldr R3, =_edata
1: cmp R2, R3
ldrlo R0, [R1], #4
strlo R0, [R2], #4
blo 1b
/* Clear .bss section (Zero init) */
mov R0, #0
ldr R1, =_bss_start
ldr R2, =_bss_end
2: cmp R1, R2
strlo R0, [R1], #4
blo 2b
/* Enter the C code */
b main
.endfunc
.end
"De cada um segundo sua capacidade a cada um segundo sua necessidade."
