eCos flash driver.

[openocd.git] / ecosflash / flash.S

diff --git a/ecosflash/flash.S b/ecosflash/flash.S
new file mode 100644 (file)
index 0000000..dc30d16
--- /dev/null
+++ b/ecosflash/flash.S
@@ -0,0 +1,58 @@
+/*
+       Jump table for flash driver
+       
+       Registers in ARM callling convention is to place args in registers 
+       starting at r0.
+       
+       So for:
+       
+       void foo(int a, int b, int c).
+       
+       a=r0
+       b=r1
+       c=r2
+       
+       
+*/
+       .global _stack_base
+       .global _stack_start
+       .global _workarea
+       .global _start
+       .global _start_bss_clear
+_start:
+       // offset=0
+       // int erase(void *address, int len)
+       ldr     sp,=_stack_start                
+       bl erase
+       nop // Stop CPU here using hw breakpoint
+       
+       // offset=0xc
+       // int program(void *buffer, void *address, int len)    
+       ldr     sp,=_stack_start              
+       bl program
+       nop // Stop CPU here using hw breakpoint
+       
+       // offset=0x18
+       ldr     r0,=_workarea                
+       nop // Stop CPU here using hw breakpoint
+       
+       // offset=0x20
+       // int init() - returns error message if the flash chip can't be detected       
+       ldr     sp,=_stack_start              
+       bl init
+       nop // Stop CPU here using hw breakpoint
+
+    .section ".bss"
+    .balign 4
+_stack_base:
+        .rept 4096
+        .byte 0
+        .endr
+_stack_start:
+    .balign 4
+_workarea:
+        .rept 8192
+        .byte 0
+        .endr
+       // NB!!! we clear bss while the stack is in use, so we start BSS clearing here !!! :-)
+_start_bss_clear: