[Bug c/117265] RFE: support for assembly macros/assembly headers

[hpa at zytor dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117265

--- Comment #12 from H. Peter Anvin <hpa at zytor dot com> ---
Certainly. This is *not* only used by copy_*_user (or {get,put}_user for that
matter), here is an example from msr.h:

static inline unsigned long long native_read_msr_safe(unsigned int msr,
                                                      int *err)
{
        DECLARE_ARGS(val, low, high);

        asm volatile("1: rdmsr ; xor %[err],%[err]\n"
                     "2:\n\t"
                     _ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_RDMSR_SAFE, %[err])
                     : [err] "=r" (*err), EAX_EDX_RET(val, low, high)
                     : "c" (msr));
        if (tracepoint_enabled(read_msr))
                do_trace_read_msr(msr, EAX_EDX_VAL(val, low, high), *err);
        return EAX_EDX_VAL(val, low, high);
}