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aarch64: Add setcontext support for SME

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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>
This commit is contained in:
Szabolcs Nagy 2021-12-17 17:14:59 +00:00
parent a7373e457f
commit 9d30e5cf96
1 changed files with 19 additions and 0 deletions
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19
sysdeps/unix/sysv/linux/aarch64/setcontext.S
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@ -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)