# Linux Kernel Module Cheat
The perfect emulation setup to study and develop the <<linux-kernel>> v5.9.2, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>.

###### 30.6.1.3.2. ARMv8 AArch32 VCVTA instruction

Example: userland/arch/arm/vcvt.S

Added in ARMv8 AArch32 only, not present in ARMv7.

In ARMv7, to use a non-round-to-zero rounding mode, you had to set the rounding mode with FPSCR and use the R version of the instruction e.g. ARM VCVTR instruction.

Now in AArch32 it is possible to do it explicitly per-instruction.

Also there was no ties to away mode in ARMv7. This mode does not exist in C99 either.