參數(shù)資料
型號(hào): ARM60
廠商: Zarlink Semiconductor Inc.
英文描述: Low power, general purpose 32-bit RISC microprocessor
中文描述: 低功耗,通用32位RISC微處理器
文件頁數(shù): 51/120頁
文件大小: 1275K
代理商: ARM60
Instruction Set - LDM, STM
47
IA, IB, DA, DB allow control when LDM/STM are not being used for stacks and simply mean Increment
After, Increment Before, Decrement After, Decrement Before.
4.8.10 Examples
LDMFD
SP!,{R0,R1,R2}
; unstack 3 registers
STMIA
R0,{R0-R15}
; save all registers
LDMFD
LDMFD
SP!,{R15}
SP!,{R15}^
; R15 <- (SP),CPSR unchanged
; R15 <- (SP), CPSR <- SPSR_mode (allowed
; only in privileged modes)
; Save user mode regs on stack (allowed
; only in privileged modes)
STMFD
R13,{R0-R14}^
These instructions may be used to save state on subroutine entry, and restore it efficiently on return to the
calling routine:
STMED
SP!,{R0-R3,R14}
; save R0 to R3 to use as workspace
; and R14 for returning
BL
somewhere
; this nested call will overwrite R14
LDMED
SP!,{R0-R3,R15}
; restore workspace and return
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