ARM product support

Answer

FAQ >> Embest IDE for ARM >> Instructions and codes

Date	2005-7-29 11:22:02
Question	About stack of ARM7
Answer
	Corresponding form of Registers of ARM7: R0 R0 .. .. R9 R9 R10 ---> SL R11 ---> FP FRAME POINTER ( base stack point to stack bottom) R12 ---> IP R13 ---> SP STACK POINTER (register of stack pointer (SP) point to top of stack R14 ---> LR R15 ---> PC graphical illustration of stack (stack-->arm7.cpp): ARM7 uses r11 register as stack bottom pointer and r13 as current top of stack under gcc2.95/2.97 compilation. A typical function stack¡¯s information structure is as below: memory high address ---------------------------------------------- \| current function parameter \| -----------------------<-------- last function top stack (r12) \| PC value (no use) when enter function \| ------------------------- <--------bottom stack (r11) function \| return address of current function \| ------------------------------ \| r13 register value of last function \| ------------------------------ stack \| r11 register value of last function \| ------------------------------ \| local variable of current function \| ------------------------------ \| parameter pass to next function \| ------------------------- <-------- top of stack (r13) memory low address ( Notice: set value to r11 is to set PC value not return address of function)