Re: some question about aarch32 for ARM64

From: Catalin Marinas
Date: Mon Feb 23 2015 - 08:27:56 EST

On Mon, Feb 23, 2015 at 12:28:57PM +0000, loody wrote:
> I follow below instructions to compile a simple c file as aarch32 but in vain.

On the above link, there are no instructions on how to compile an
AArch32 application with the AArch64 compiler. You need an AArch32 gcc
(e.g. arm-linux-gnu-gcc, not aarch64-linux-gnu-gcc).

> I saw there are aarch32 support in arm64 kernel porting.

Yes, that's to support AArch32 binaries (ARMv8/v7/...).

> Would you mind to let us know how to get aarch32 ELF for running on
> ARM64 processors?

Just use the right compiler.

> PS:Below is my compile error message:
> #aarch64-linux-gnu-gcc -mabi=ilp32 test.c

-mabi=ilp32 is entirely different from an AArch32 compiler. The above
still generates AArch64 but with the ILP32 ABI (sizeof int/long/pointer
is 32-bit).

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