嘿，我正在开展一个简单的大学项目并为GameBoy Advanced制作游戏。
我一直在玩asm，打算通过ASM和THUMB模式创建我的调色板。
我尝试使用ldr和str将内存地址0x0500000（调色板内存）加载到寄存器中并存储0x253F（红色）等值并将其存储到调色板地址中。怎么可以这样做？我也试过使用MOV，但也没有成功。
下面的代码编译，但它似乎无法正常工作
.THUMB @ turn on thumb
.ALIGN 2 @ align code correctly for GBA
.GLOBL test @ name of function goes here
.THUMB_FUNC @ we are about to declare a thumb function
test: @ function start
push { r4-r7, lr } @ push r4-r7 and link register onto stack. Your function might use these
@ registers, so we need to preserve the values just in case!
@ we don't need to worry about r0-r3 as it is assumed they will be regularly messed up anyway
@ the magic happens here!
@ r0-r3 will automatically contain the parameters sent when calling the function.
ldr r5, =#0x5000000
ldr r4, =#0x03DF
str r5, [r4]
pop { r4-r7 } @ pop first 4 values from stack back into r4-r7, and also
pop { r3 } @ pop the next value from stack (stored value for lr) into some unused register, e.g. r3 -
@ we cannot overwrite lr so we have to do it via a normal register
bx r3 @ "branch and exchange" (return) back to C, using the previous value for lr stored in r3
@ ==================================
我真的很感激任何帮助