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| author | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2021-12-17 17:14:59 +0000 |
|---|---|---|
| committer | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2024-01-02 15:43:30 +0000 |
| commit | 9d30e5cf9687559d942514c780332d53b0617f0b (patch) | |
| tree | feea322faaf19730aedbe8433822fff9fa9677c5 | |
| parent | a7373e457f0b5953d230f7756627036b1711dcc3 (diff) | |
| download | glibc-9d30e5cf9687559d942514c780332d53b0617f0b.tar.gz glibc-9d30e5cf9687559d942514c780332d53b0617f0b.tar.xz glibc-9d30e5cf9687559d942514c780332d53b0617f0b.zip | |
aarch64: Add setcontext support for SME
For the ZA lazy saving scheme to work, setcontext has to call __libc_arm_za_disable. Also fixes swapcontext which uses setcontext internally. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
| -rw-r--r-- | sysdeps/unix/sysv/linux/aarch64/setcontext.S | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/aarch64/setcontext.S b/sysdeps/unix/sysv/linux/aarch64/setcontext.S index 699c31189f..ba659438c5 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) |