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| author | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2021-12-01 11:37:44 +0000 |
|---|---|---|
| committer | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2024-01-02 15:43:30 +0000 |
| commit | a7373e457f0b5953d230f7756627036b1711dcc3 (patch) | |
| tree | 637d990fb97e2d9018cd682c5db199cb76fd7712 /sysdeps | |
| parent | d3c32ae207d4fc3e48bb47ce1b9f2c6cf0f35c4f (diff) | |
| download | glibc-a7373e457f0b5953d230f7756627036b1711dcc3.tar.gz glibc-a7373e457f0b5953d230f7756627036b1711dcc3.tar.xz glibc-a7373e457f0b5953d230f7756627036b1711dcc3.zip | |
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>
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/aarch64/__longjmp.S | 22 |
1 files changed, 22 insertions, 0 deletions
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] |