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aarch64: Add longjmp support for SME

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For the ZA lazy saving scheme to work, longjmp has to call
__libc_arm_za_disable.

In ld.so we assume ZA is not used so longjmp does not need
special support there.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Szabolcs Nagy 2021-12-01 11:37:44 +00:00
parent d3c32ae207
commit a7373e457f
1 changed files with 22 additions and 0 deletions
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22
sysdeps/aarch64/__longjmp.S
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@ -49,6 +49,28 @@ ENTRY (__longjmp)
PTR_ARG (0)
#if IS_IN(libc)
/* Disable ZA state of SME in libc.a and libc.so, but not in ld.so. */
# 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
#endif
ldp x19, x20, [x0, #JB_X19<<3]
ldp x21, x22, [x0, #JB_X21<<3]
ldp x23, x24, [x0, #JB_X23<<3]