Port a lot more code to AARCH64

- Introduce epoll_pwait()
- Rewrite -ftrapv and ffs() libraries in C code
- Use more FreeBSD code in math function library
- Get significantly more tests passing on qemu-aarch64
- Fix many Musl long double functions that were broken on AARCH64

third_party/python/Include/yoink.h

@@ -1,10 +1,19 @@
 #ifndef COSMOPOLITAN_THIRD_PARTY_PYTHON_INCLUDE_YOINK_H_
 #define COSMOPOLITAN_THIRD_PARTY_PYTHON_INCLUDE_YOINK_H_
 
+#ifdef __x86_64__
 #define PYTHON_YOINK(s)             \
   __asm__(".section .yoink\n\t"     \
           "nopl\t\"pyc:" s "\"\n\t" \
           ".previous")
+#elif defined(__aarch64__)
+#define PYTHON_YOINK(s)           \
+  __asm__(".section .yoink\n\t"   \
+          "bl\t\"pyc:" s "\"\n\t" \
+          ".previous")
+#else
+#error "architecture unsupported"
+#endif /* __x86_64__ */
 
 #define PYTHON_PROVIDE(s)             \
   __asm__(".section .yoink\n"         \

third_party/python/Python/cosmomodule.c

@@ -53,9 +53,11 @@ PYTHON_PROVIDE("cosmo.crc32c");
 PYTHON_PROVIDE("cosmo.syscount");
 PYTHON_PROVIDE("cosmo.popcount");
 PYTHON_PROVIDE("cosmo.decimate");
+PYTHON_PROVIDE("cosmo.ftrace");
+#ifdef __x86_64__
 PYTHON_PROVIDE("cosmo.getcpucore");
 PYTHON_PROVIDE("cosmo.getcpunode");
-PYTHON_PROVIDE("cosmo.ftrace");
+#endif /* __x86_64__ */
 
 PyDoc_STRVAR(cosmo_doc,
 "Cosmopolitan Libc Module\n\
@@ -103,6 +105,8 @@ PyDoc_STRVAR(getcpucore_doc,
 --\n\n\
 Returns 0-indexed CPU core on which process is currently scheduled.");
 
+#ifdef __x86_64__
+
 static PyObject *
 cosmo_getcpucore(PyObject *self, PyObject *noargs)
 {
@@ -120,6 +124,8 @@ cosmo_getcpunode(PyObject *self, PyObject *noargs)
     return PyLong_FromUnsignedLong(TSC_AUX_NODE(rdpid()));
 }
 
+#endif /* __x86_64__ */
+
 PyDoc_STRVAR(crc32c_doc,
 "crc32c($module, bytes, init=0)\n\
 --\n\n\
@@ -332,8 +338,10 @@ static PyMethodDef cosmo_methods[] = {
     {"syscount", cosmo_syscount, METH_NOARGS, syscount_doc},
     {"popcount", cosmo_popcount, METH_VARARGS, popcount_doc},
     {"decimate", cosmo_decimate, METH_VARARGS, decimate_doc},
+#ifdef __x86_64__
     {"getcpucore", cosmo_getcpucore, METH_NOARGS, getcpucore_doc},
     {"getcpunode", cosmo_getcpunode, METH_NOARGS, getcpunode_doc},
+#endif /* __x86_64__ */
 #ifdef __PG__
     {"ftrace", cosmo_ftrace, METH_NOARGS, ftrace_doc},
 #endif

third_party/python/Python/pymath.c

@@ -34,6 +34,4 @@ unsigned short _Py_get_387controlword(void) {
 void _Py_set_387controlword(unsigned short cw) {
     __asm__ __volatile__ ("fldcw %0" : : "m" (cw));
 }
-#else
-#error wut
 #endif

third_party/python/pyconfig.h

@@ -6,14 +6,17 @@
 
 #define STDC_HEADERS                    1
 #define HAVE_LONG_DOUBLE                1
-#define HAVE_GCC_ASM_FOR_X64            1
-#define HAVE_GCC_ASM_FOR_X87            1
 #define HAVE_GCC_UINT128_T              1
 #define HAVE_STDARG_PROTOTYPES          1
 #define HAVE_BUILTIN_ATOMIC             1
 #define HAVE_COMPUTED_GOTOS             1
 #define DOUBLE_IS_LITTLE_ENDIAN_IEEE754 1
 
+#ifdef __x86_64__
+#define HAVE_GCC_ASM_FOR_X64 1
+#define HAVE_GCC_ASM_FOR_X87 1
+#endif
+
 #define HAVE_ACOSH         1
 #define HAVE_ASINH         1
 #define HAVE_ATANH         1
@@ -100,7 +103,7 @@
 #define HAVE_DECL_RTLD_NOW      1
 
 #define HAVE_GETSID        1
-#define HAVE_GETEUID        1
+#define HAVE_GETEUID       1
 #define HAVE_GETTIMEOFDAY  1
 #define HAVE_GETUID        1
 #define HAVE_GETNAMEINFO   1