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Merge pull request #200 from grissiom/cortex-r4 

Cortex r4
This commit is contained in:
Bernard Xiong 2013-11-16 21:24:18 -08:00
parent 394657979d 0c9b9ced31
commit a2bd42c81a
1 changed files with 8 additions and 12 deletions
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20
libcpu/arm/cortex-r4/start_gcc.S
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@ -18,11 +18,10 @@
.equ F_Bit, 0x40 @ when F bit is set, FIQ is disabled .equ F_Bit, 0x40 @ when F bit is set, FIQ is disabled
.equ UND_Stack_Size, 0x00000000 .equ UND_Stack_Size, 0x00000000
.equ SVC_Stack_Size, 0x00000100 .equ SVC_Stack_Size, 0x00000000
.equ ABT_Stack_Size, 0x00000000 .equ ABT_Stack_Size, 0x00000000
.equ FIQ_Stack_Size, 0x00000000 .equ FIQ_Stack_Size, 0x00001000
.equ IRQ_Stack_Size, 0x00000100 .equ IRQ_Stack_Size, 0x00001000
.equ USR_Stack_Size, 0x00000100
.section .bss.noinit .section .bss.noinit
/* stack */ /* stack */
@ -31,7 +30,7 @@
stack_start: stack_start:
.rept (UND_Stack_Size + SVC_Stack_Size + ABT_Stack_Size + FIQ_Stack_Size + IRQ_Stack_Size) .rept (UND_Stack_Size + SVC_Stack_Size + ABT_Stack_Size + FIQ_Stack_Size + IRQ_Stack_Size)
.long 0 .byte 0
.endr .endr
stack_top: stack_top:
@ -63,6 +62,9 @@ _reset:
@ Initialize Stack Pointers @ Initialize Stack Pointers
ldr r0, =stack_top ldr r0, =stack_top
@ Set the startup stack for svc
mov sp, r0
@ Enter Undefined Instruction Mode and set its Stack Pointer @ Enter Undefined Instruction Mode and set its Stack Pointer
msr cpsr_c, #Mode_UND|I_Bit|F_Bit msr cpsr_c, #Mode_UND|I_Bit|F_Bit
mov sp, r0 mov sp, r0
@ -83,14 +85,8 @@ _reset:
mov sp, r0 mov sp, r0
sub r0, r0, #IRQ_Stack_Size sub r0, r0, #IRQ_Stack_Size
@ Enter Supervisor Mode and set its Stack Pointer @ Switch back to SVC
msr cpsr_c, #Mode_SVC|I_Bit|F_Bit msr cpsr_c, #Mode_SVC|I_Bit|F_Bit
mov sp, r0
sub r0, r0, #SVC_Stack_Size
@ Enter User Mode and set its Stack Pointer
mov sp, r0
sub sl, sp, #USR_Stack_Size
bl next1 bl next1
next1: next1: