I think the safest way is to box them into NSNumber instances. NSLog(@”Number is %@”, @(number)); // use the highest level of abstraction This boxing doesn’t usually have to create a new object thanks to tagged pointer magic. If you really don’t want to use NSNumber, you can cast primitive types manually, as others suggested: … Read more
QEMU’s Cortex-A53 emulation by default only emulates a CPU with EL1, not EL2 or EL3, and therefore (as the architecture requires) we boot up in EL1. If you want a CPU with EL2 or EL3 you need to specifically enable it on the command line, with -machine virtualization=on to enable EL2, and -machine secure=on to … Read more
QEMU’s command line options for loading code into the guest are various, and often have different semantics between architectures or even between machine types for the same architecture. This is unfortunate but is the result of backwards-compatibility with older QEMU versions and a gradual accumulation of “it would be nice to Do The Right Thing … Read more
Providing the hardware bit for strict alignment checking is not turned on (which, as on x86, no general-purpose OS is realistically going to do), AArch64 does permit unaligned data accesses to Normal (not Device) memory with the regular load/store instructions. However, there are several reasons why a compiler would still want to maintain aligned data: … Read more
If I use a cross compiler, how can I tell the value of the –host option I should give when I run ./configure? Three machines must be distinguished when discussing toolchain creation The build machine, where the toolchain is built. The host machine, where the toolchain will be executed. The target machine, where the binaries … Read more
ADR ADR is a simple PC-relative address calculation: you give it an immediate offset, and it stores in the register the address relative to the current PC. For example, if the following ADR instruction is placed at position 0x4000 in memory: adr x0, #1 then after this instruction is executed x0 now contains the value … Read more
Use “Standard architectures” like this: Architecture: “Standard architectures” arm7, arm64 Valid Architectures: “arm64” , armv7… Build Active Architecture Only – NO (specially… if your connected device is not arm64 compatible) like this: Additionally, unplugging iphones and ipads from the mac has been known to help, especially if they are 32-bit versions.