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aarch64: Add longjmp support for SME
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>
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@ -49,6 +49,28 @@ ENTRY (__longjmp)
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PTR_ARG (0)
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#if IS_IN(libc)
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/* Disable ZA state of SME in libc.a and libc.so, but not in ld.so. */
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# if HAVE_AARCH64_PAC_RET
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PACIASP
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cfi_window_save
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# endif
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stp x29, x30, [sp, -16]!
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cfi_adjust_cfa_offset (16)
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cfi_rel_offset (x29, 0)
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cfi_rel_offset (x30, 8)
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mov x29, sp
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bl __libc_arm_za_disable
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ldp x29, x30, [sp], 16
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cfi_adjust_cfa_offset (-16)
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cfi_restore (x29)
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cfi_restore (x30)
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# if HAVE_AARCH64_PAC_RET
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AUTIASP
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cfi_window_save
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# endif
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#endif
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ldp x19, x20, [x0, #JB_X19<<3]
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ldp x21, x22, [x0, #JB_X21<<3]
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ldp x23, x24, [x0, #JB_X23<<3]
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