[Bug 38780] AArch64 platforms: register X18 (TEB) must remain reserved for Wine to run 64-bit ARM Windows applications ( Distro aarch64 toolchains need '-ffixed-x18' default, loader/libc/userland )

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=38780

Anastasius Focht <focht at gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |NEW
            Summary|AArch64 platforms: register |AArch64 platforms: register
                   |X18 must remain reserved    |X18 (TEB) must remain
                   |for Wine to run 64-bit ARM  |reserved for Wine to run
                   |Windows applications        |64-bit ARM Windows
                   |(Distro aarch64 toolchains  |applications (Distro
                   |need '-ffixed-x18' default, |aarch64 toolchains need
                   |loader/libc/userland)       |'-ffixed-x18' default,
                   |                            |loader/libc/userland)

--- Comment #12 from Anastasius Focht <focht at gmx.net> ---
Hello folks,

setting status again to 'NEW'.

It's also documented now in Microsoft docs:

https://docs.microsoft.com/en-us/cpp/build/arm64-windows-abi-conventions?view=vs-2017

--- quote ---
...
Integer registers

The AArch64 architecture supports 32 integer registers, summarized below:

Register     Volatile?     Role

x0             Volatile     Parameter/scratch register 1, result register
x1-x7             Volatile     Parameter/scratch register 2-8
x8-x15             Volatile     Scratch registers
x16-x17     Volatile     Intra-procedure-call scratch registers
x18             Non-volatile     Platform register: in kernel mode, points to
KPCR for the current processor; in user mode, points to TEB
x19-x28     Non-volatile     Scratch registers
x29/fp             Non-volatile     Frame pointer
x30/lr             Non-volatile     Link registers
--- quote ---

Regards

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