diff options
Diffstat (limited to 'sysdeps/aarch64/setjmp.S')
| -rw-r--r-- | sysdeps/aarch64/setjmp.S | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/sysdeps/aarch64/setjmp.S b/sysdeps/aarch64/setjmp.S index d82d62c..53c5e7d 100644 --- a/sysdeps/aarch64/setjmp.S +++ b/sysdeps/aarch64/setjmp.S @@ -35,6 +35,20 @@ libc_hidden_def (_setjmp) ENTRY_ALIGN (__sigsetjmp, 2) 1: + +#if IS_IN(libc) + /* Disable ZA state of SME in libc.a and libc.so, but not in ld.so. + The calling convention of __libc_arm_za_disable allows to do + this thus allowing to avoid saving to and reading from stack. + As a result we also don't need to sign the return address and + check it after returning because it is not stored to stack. */ + mov x13, x30 + cfi_register (x30, x13) + bl __libc_arm_za_disable + mov x30, x13 + cfi_register (x13, x30) +#endif + stp x19, x20, [x0, #JB_X19<<3] stp x21, x22, [x0, #JB_X21<<3] stp x23, x24, [x0, #JB_X23<<3] @@ -73,7 +87,7 @@ L(gcs_done): #if IS_IN (rtld) /* In ld.so we never save the signal mask */ mov w0, #0 - RET + ret #else b C_SYMBOL_NAME(__sigjmp_save) #endif |