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SubjectRe: [PATCH v2 2/2] syscall.2: add x32 ABI
Hi Jann,

On 24 March 2015 at 19:40, Jann Horn <jann@thejh.net> wrote:
> [added H. Peter Anvin to CC for this patch because he
> seems to have contributed large parts of the X32 code]

It looks like I did not reply to this mail. But as you'll probably have seen
from the man-pages-3.83 release announcement, I did apply this patch.
Thanks!

Cheers,

Michael


>
> ---
> man2/syscall.2 | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/man2/syscall.2 b/man2/syscall.2
> index ef8f3cf..1f25255 100644
> --- a/man2/syscall.2
> +++ b/man2/syscall.2
> @@ -170,12 +170,18 @@ s390 svc 0 r1 r2 See below
> s390x svc 0 r1 r2 See below
> sparc/32 t 0x10 g1 o0
> sparc/64 t 0x6d g1 o0
> -x86_64 syscall rax rax
> +x86_64 syscall rax rax See below
> +x32 syscall rax rax See below
> .TE
> .PP
> For s390 and s390x, NR (the system call number)
> may be passed directly with "svc NR" if it is less than 256.
>
> +The x32 ABI uses the same instruction as the x86_64 ABI and is used on
> +the same processors. To differentiate between them, the bitmask
> +.I __X32_SYSCALL_BIT
> +is bitwise-ORed into the syscall number for syscalls under the x32 ABI.
> +
> On a few architectures,
> a register is used to indicate simple boolean failure of the system call:
> ia64 uses
> @@ -210,6 +216,7 @@ s390x r2 r3 r4 r5 r6 r7 -
> sparc/32 o0 o1 o2 o3 o4 o5 -
> sparc/64 o0 o1 o2 o3 o4 o5 -
> x86_64 rdi rsi rdx r10 r8 r9 -
> +x32 rdi rsi rdx r10 r8 r9 -
> .TE
> .PP
> The mips/o32 system call convention passes
> --
> 2.1.4



--
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/


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