【发布时间】:2015-03-29 12:27:18
【问题描述】:
我正在尝试将代码从代码内存复制到堆栈,然后在堆栈中使用该代码执行。我正在使用以下功能
;Personal Function
IMPORT extfunc
EXPORT func
func
LDR R0,=extfunc;Function in C
LDR R1,=0x00000000;Counter for Counting instructions when i make code generic
PUSH {LR};For nested call
ADD R3,SP,#0x00;move
SUB SP,#0x10;As stack grows upwards, we just make space for 10 instructions for testing
ADD R5,SP,#0x0;Where we branch after copying
LOOP
LDR SP,[R0];Load in stack instruction
ADD R1,R1,#0x01;instruction count
ADD R0,#0x04;next C instruction address
ADD SP,#0x04;next instruction address
CMP R1,#0x10;Copy 10 instructions
BLT LOOP
ADD R0,PC,#0x0C;Get ready for branching
ADD LR,R0,#0x00;LR prepared
ADD PC,R5,#0x00;GO
ADD SP,R3,#0x00;When we return restore the SP
POP {LR}
BX LR
但我收到以下错误
startup_XMC4500.s(335):错误:A1477E:此寄存器组合导致不可预测的行为
startup_XMC4500.s(336):错误:A1477E:此寄存器组合导致不可预测的行为
显然您无法将 PC 移动到运行时计算的任意地址,谁能告诉我解决此问题的方法?
【问题讨论】:
标签: assembly stack arm runtime