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From: Szabolcs Nagy <nsz@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] aarch64: Add longjmp support for SME Date: Tue, 2 Jan 2024 17:21:51 +0000 (GMT) [thread overview] Message-ID: <20240102172151.C988B3858005@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a7373e457f0b5953d230f7756627036b1711dcc3 commit a7373e457f0b5953d230f7756627036b1711dcc3 Author: Szabolcs Nagy <szabolcs.nagy@arm.com> Date: Wed Dec 1 11:37:44 2021 +0000 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> Diff: --- sysdeps/aarch64/__longjmp.S | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/sysdeps/aarch64/__longjmp.S b/sysdeps/aarch64/__longjmp.S index 2c8ff54112..7b6add751e 100644 --- a/sysdeps/aarch64/__longjmp.S +++ b/sysdeps/aarch64/__longjmp.S @@ -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]
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