QEMU Changes

QEMU was cloned under:

qemu/

The custom linux-user emulator is:

qemu/build/qemu-aarch64_ilp32

New Target

Added:

qemu/configs/targets/aarch64_ilp32-linux-user.mak

This defines a linux-user target based on AArch64 but built with TARGET_ABI32, so QEMU has a separate executable for ILP32 user binaries:

qemu-aarch64_ilp32

ELF Loader Support

Modified:

qemu/linux-user/aarch64/target_elf.h

Key behavior:

• reports ELFCLASS32 when TARGET_ABI32 is enabled;
• keeps the machine type as AArch64;
• disables the AArch64 VDSO path for ABI32 for now.

Address Space and mmap

Modified:

qemu/linux-user/aarch64/target_mman.h
qemu/target/arm/cpu-param.h

Key behavior:

• uses a 32-bit virtual address shape for the AArch64 ILP32 target;
• keeps mappings in a range suitable for ILP32 user pointers.

Linux-User Syscall ABI Fixes

Modified:

qemu/linux-user/qemu.h
qemu/linux-user/syscall.c
qemu/linux-user/syscall_defs.h

Key behavior:

• avoids treating AArch64 ILP32 as legacy ARM OABI;
• avoids old ARM-only UID/stat assumptions for this target;
• adds an AArch64 ILP32 target_stat layout path;

Usage

• Apply the patch with git -C ~/fresh_qemu/qemu am qemu-ilp32/qemu-aarch64-ilp32.patch
• Build with: ./configure --target-list=aarch64_ilp32-linux-user --disable-docs then ninja -C build qemu-aarch64_ilp32
• Run the output binary at: qemu/build/qemu-aarch64_ilp32