| Message ID | 4d546102e14a17458005727b7c8a692bcd74e435.1702051831.git.szabolcs.nagy@arm.com |
|---|---|
| State | Committed |
| Commit | 9d30e5cf9687559d942514c780332d53b0617f0b |
| Headers |
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From: Szabolcs Nagy <szabolcs.nagy@arm.com>
To: <libc-alpha@sourceware.org>
Subject: [PATCH 3/4] aarch64: Add setcontext support for SME
Date: Fri, 8 Dec 2023 16:32:28 +0000
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|
| Series |
aarch64: Add SME support
|
|
Checks
| Context | Check | Description |
|---|---|---|
| redhat-pt-bot/TryBot-apply_patch | success | Patch applied to master at the time it was sent |
| linaro-tcwg-bot/tcwg_glibc_build--master-aarch64 | success | Testing passed |
| linaro-tcwg-bot/tcwg_glibc_check--master-aarch64 | success | Testing passed |
| linaro-tcwg-bot/tcwg_glibc_build--master-arm | success | Testing passed |
| linaro-tcwg-bot/tcwg_glibc_check--master-arm | success | Testing passed |
Commit Message
Szabolcs Nagy
Dec. 8, 2023, 4:32 p.m. UTC
For the ZA lazy saving scheme to work, setcontext has to call __libc_arm_za_disable. Also fixes swapcontext which uses setcontext internally. --- sysdeps/unix/sysv/linux/aarch64/setcontext.S | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
Comments
On 08/12/23 13:32, Szabolcs Nagy wrote: > For the ZA lazy saving scheme to work, setcontext has to call > __libc_arm_za_disable. > > Also fixes swapcontext which uses setcontext internally. LGTM, thanks. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> > --- > sysdeps/unix/sysv/linux/aarch64/setcontext.S | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > > diff --git a/sysdeps/unix/sysv/linux/aarch64/setcontext.S b/sysdeps/unix/sysv/linux/aarch64/setcontext.S > index d7756015c5..fe75adf61e 100644 > --- a/sysdeps/unix/sysv/linux/aarch64/setcontext.S > +++ b/sysdeps/unix/sysv/linux/aarch64/setcontext.S > @@ -49,6 +49,25 @@ ENTRY (__setcontext) > cbz x0, 1f > b C_SYMBOL_NAME (__syscall_error) > 1: > + /* Disable ZA of SME. */ > +#if HAVE_AARCH64_PAC_RET > + PACIASP > + cfi_window_save > +#endif > + stp x29, x30, [sp, -16]! > + cfi_adjust_cfa_offset (16) > + cfi_rel_offset (x29, 0) > + cfi_rel_offset (x30, 8) > + mov x29, sp > + bl __libc_arm_za_disable > + ldp x29, x30, [sp], 16 > + cfi_adjust_cfa_offset (-16) > + cfi_restore (x29) > + cfi_restore (x30) > +#if HAVE_AARCH64_PAC_RET > + AUTIASP > + cfi_window_save > +#endif > /* Restore the general purpose registers. */ > mov x0, x9 > cfi_def_cfa (x0, 0)
diff --git a/sysdeps/unix/sysv/linux/aarch64/setcontext.S b/sysdeps/unix/sysv/linux/aarch64/setcontext.S index d7756015c5..fe75adf61e 100644 --- a/sysdeps/unix/sysv/linux/aarch64/setcontext.S +++ b/sysdeps/unix/sysv/linux/aarch64/setcontext.S @@ -49,6 +49,25 @@ ENTRY (__setcontext) cbz x0, 1f b C_SYMBOL_NAME (__syscall_error) 1: + /* Disable ZA of SME. */ +#if HAVE_AARCH64_PAC_RET + PACIASP + cfi_window_save +#endif + stp x29, x30, [sp, -16]! + cfi_adjust_cfa_offset (16) + cfi_rel_offset (x29, 0) + cfi_rel_offset (x30, 8) + mov x29, sp + bl __libc_arm_za_disable + ldp x29, x30, [sp], 16 + cfi_adjust_cfa_offset (-16) + cfi_restore (x29) + cfi_restore (x30) +#if HAVE_AARCH64_PAC_RET + AUTIASP + cfi_window_save +#endif /* Restore the general purpose registers. */ mov x0, x9 cfi_def_cfa (x0, 0)