Homebrew ASM Question about LDR

[ely42]

Hello guys, I was looking at the disassembly of NTR CFW and I want know if in the expresion:

STR    R1, [R7,#(install_state - 0x10A924)]

the minus ("-") is for a substraction.

Thank in advance

 

[ksanislo]

Yeah, the #() part is an expression to calculate the offset from the value of R7 for the store of what's in R1.

http://infocenter.arm.com/help/topic/com.arm.doc.kui0100a/armasm_cihgjhed.htm

 

[ely42]

Thanks man So in this case R1 = R7 + (install_state -0x10A924) right ?

 

[ksanislo]

Thanks man So in this case R1 = R7 + (install_state -0x10A924) right ?

I read it more as "save the value of R1 to memory location at R7 + (install_state - 0x10A924)", but I think that might be what you're already saying, just worded differently

 

[ely42]

Oh my bad, you're right It write from R1 not load to R1. I'm still reading the disassembly and the line I was reading contained a LDR instruction, it confused me A big thank to you