From: cauldwell.thomas@nospicedham.gmail.com   
      
   Over on comp.unix.programmer, Adam Sampson gave me inline assembler that works:   
      
    __asm(".text\n"   
    "Invoke:\n"   
    " mov x1, x8\n"   
    " adr x9, f\n"   
    " ldr x9, [x9]\n"   
    " br x9\n"   
    );   
      
   For the sake of posting to this newsgroup, I simplified my problem just a tiny   
   bit. Previously I told you that 'f' was a global variable defined as follows:   
      
       void (*f)(void);   
      
   but in actual fact it's:   
      
       thread_local void (*f)(void);   
      
   If I change it to thread_local then try to re-compile the inline assembler, I   
   get a linker error:   
      
       R_AARCH64_ADR_PREL_LO21 used with TLS symbol f   
      
   Do you know what syntax I use to access the thread_local variable from   
   assembler? Will I need to write a separate function as follows?   
      
   void (*getf(void))(void)   
   {   
       return f;   
   }   
      
   and then call that function from my assembler? I'm worried about corrupting   
   the caller-saved registers, because I perform a 'br' rather than a 'blr' (i.e.   
   I perform a jump rather than a function call). I suppose I could push all the   
   caller-saved    
   registers before invoking 'getf' and then pop afterward... which I know how to   
   do on x86_64 but I'm new to all this aarch64 stuff.   
      
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