Re: Usage of "p" constraint in BPF inline asm

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On 8/10/23 3:35 AM, Jose E. Marchesi wrote:

Hello.

We found that some of the BPF selftests use the "p" constraint in inline
assembly snippets, for input operands for MOV (rN = rM) instructions.

This is mainly done via the __imm_ptr macro defined in
tools/testing/selftests/bpf/progs/bpf_misc.h:

   #define __imm_ptr(name) [name]"p"(&name)

Example:

   int consume_first_item_only(void *ctx)
   {
         struct bpf_iter_num iter;
         asm volatile (
                 /* create iterator */
                 "r1 = %[iter];"
                 [...]
                 :
                 : __imm_ptr(iter)
                 : CLOBBERS);
         [...]
   }

Little equivalent reproducer:

   int bar ()
   {
     int jorl;
     asm volatile ("r1 = %a[jorl]" : : [jorl]"p"(&jorl));
     return jorl;
   }

The "p" constraint is a tricky one.  It is documented in the GCC manual
section "Simple Constraints":

   An operand that is a valid memory address is allowed.  This is for
   ``load address'' and ``push address'' instructions.

   p in the constraint must be accompanied by address_operand as the
   predicate in the match_operand.  This predicate interprets the mode
   specified in the match_operand as the mode of the memory reference for
   which the address would be valid.

There are two problems:

1. It is questionable whether that constraint was ever intended to be
    used in inline assembly templates, because its behavior really
    depends on compiler internals.  A "memory address" is not the same
    than a "memory operand" or a "memory reference" (constraint "m"), and
    in fact its usage in the template above results in an error in both
    x86_64-linux-gnu and bpf-unkonwn-none:

      foo.c: In function ‘bar’:
      foo.c:6:3: error: invalid 'asm': invalid expression as operand
         6 |   asm volatile ("r1 = %[jorl]" : : [jorl]"p"(&jorl));
           |   ^~~

    I would assume the same happens with aarch64, riscv, and most/all
    other targets in GCC, that do not accept operands of the form A + B
    that are not wrapped either in a const or in a memory reference.

    To avoid that error, the usage of the "p" constraint in internal GCC
    instruction templates is supposed to be complemented by the 'a'
    modifier, like in:

      asm volatile ("r1 = %a[jorl]" : : [jorl]"p"(&jorl));

    Internally documented (in GCC's final.cc) as:

      %aN means expect operand N to be a memory address
         (not a memory reference!) and print a reference
         to that address.

    That works because when the modifier 'a' is found, GCC prints an
    "operand address", which is not the same than an "operand".

    But...

2. Even if we used the internal 'a' modifier (we shouldn't) the 'rN =
    rM' instruction really requires a register argument.  In cases
    involving automatics, like in the examples above, we easily end with:

      bar:
         #APP
             r1 = r10-4
         #NO_APP

    In other cases we could conceibly also end with a 64-bit label that
    may overflow the 32-bit immediate operand of `rN = imm32'
    instructions:

         r1 = foo

    All of which is clearly wrong.

clang happens to do "the right thing" in the current usage of __imm_ptr
in the BPF tests, because even with -O2 it seems to "reload" the
fp-relative address of the automatic to a register like in:

   bar:
	r1 = r10
	r1 += -4
	#APP
	r1 = r1
	#NO_APP

Unfortunately, the modifier 'a' won't work for clang.

$ cat t.c

int bar ()

{

int jorl;

asm volatile ("r1 = %a[jorl]" : : [jorl]"p"(&jorl));

return jorl;

}

$ gcc -O2 -g -S t.c

$ clang --target=bpf -O2 -g -S t.c

clang: ../lib/Target/BPF/BPFAsmPrinter.cpp:126: virtual bool {anonymous}::BPFAsmPrinter::PrintAsmMemoryOperand(const llvm::MachineInstr*, unsigned int, const char*, llvm::raw_ostream&): Assertion `Offs
etMO.isImm() && "Unexpected offset for inline asm memory operand."' failed.
...

I guess BPF backend can try to add support for this 'a' modifier
if necessary.

Which is what GCC would generate with -O0.  Whether this is by chance or
by design (Nick, do you know?) I don't think the compiler should be
expected to do that reload driven by the "p" constraint.

I would suggest to change that macro (and similar out of macro usages of
the "p" constraint in selftests/bpf/progs/iters.c) to use the "r"
constraint instead.  If a register is what is required, we should let
the compiler know.

Could you specify what is the syntax ("r" constraint) which will work
for both clang and gcc?


Thoughts?

PS: I am aware that the x86 port of the kernel uses the "p" constraint
     in the percpu macros (arch/x86/include/asm/percpu.h) but that usage
     is in a different context (I would assume it is used in x86
     instructions that get constant addresses or global addresses loaded
     in registers and not automatics) where it seems to work well.





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