libbpf: Handle GCC built-in types for Arm NEON

When building Arm NEON (SIMD) code from lib/raid6/neon.uc, GCC emits
DWARF information using a base type "__Poly8_t", which is internal to
GCC and not recognized by Clang. This causes build failures when
building with Clang a vmlinux.h generated from an arm64 kernel that was
built with GCC.

	vmlinux.h:47284:9: error: unknown type name '__Poly8_t'
	typedef __Poly8_t poly8x16_t[16];
	        ^~~~~~~~~

The polyX_t types are defined as unsigned integers in the "Arm C
Language Extension" document (101028_Q220_00_en). Emit typedefs based on
standard integer types for the GCC internal types, similar to those
emitted by Clang.

Including linux/kernel.h to use ARRAY_SIZE() incidentally redefined
max(), causing a build bug due to different types, hence the seemingly
unrelated change.

Reported-by: Jakov Petrina <jakov.petrina@sartura.hr>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200812143909.3293280-1-jean-philippe@linaro.org

diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c
index cf71116..ac81f3f 100644 (file)
--- a/tools/lib/bpf/btf_dump.c
+++ b/tools/lib/bpf/btf_dump.c
@@ -13,6 +13,7 @@
 #include <errno.h>
 #include <linux/err.h>
 #include <linux/btf.h>
+#include <linux/kernel.h>
 #include "btf.h"
 #include "hashmap.h"
 #include "libbpf.h"
@@ -549,6 +550,9 @@ static int btf_dump_order_type(struct btf_dump *d, __u32 id, bool through_ptr)
        }
 }
 
+static void btf_dump_emit_missing_aliases(struct btf_dump *d, __u32 id,
+                                         const struct btf_type *t);
+
 static void btf_dump_emit_struct_fwd(struct btf_dump *d, __u32 id,
                                     const struct btf_type *t);
 static void btf_dump_emit_struct_def(struct btf_dump *d, __u32 id,
@@ -671,6 +675,9 @@ static void btf_dump_emit_type(struct btf_dump *d, __u32 id, __u32 cont_id)
 
        switch (kind) {
        case BTF_KIND_INT:
+               /* Emit type alias definitions if necessary */
+               btf_dump_emit_missing_aliases(d, id, t);
+
                tstate->emit_state = EMITTED;
                break;
        case BTF_KIND_ENUM:
@@ -870,7 +877,7 @@ static void btf_dump_emit_struct_def(struct btf_dump *d,
                        btf_dump_printf(d, ": %d", m_sz);
                        off = m_off + m_sz;
                } else {
-                       m_sz = max(0, btf__resolve_size(d->btf, m->type));
+                       m_sz = max(0LL, btf__resolve_size(d->btf, m->type));
                        off = m_off + m_sz * 8;
                }
                btf_dump_printf(d, ";");
@@ -890,6 +897,32 @@ static void btf_dump_emit_struct_def(struct btf_dump *d,
                btf_dump_printf(d, " __attribute__((packed))");
 }
 
+static const char *missing_base_types[][2] = {
+       /*
+        * GCC emits typedefs to its internal __PolyX_t types when compiling Arm
+        * SIMD intrinsics. Alias them to standard base types.
+        */
+       { "__Poly8_t",          "unsigned char" },
+       { "__Poly16_t",         "unsigned short" },
+       { "__Poly64_t",         "unsigned long long" },
+       { "__Poly128_t",        "unsigned __int128" },
+};
+
+static void btf_dump_emit_missing_aliases(struct btf_dump *d, __u32 id,
+                                         const struct btf_type *t)
+{
+       const char *name = btf_dump_type_name(d, id);
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(missing_base_types); i++) {
+               if (strcmp(name, missing_base_types[i][0]) == 0) {
+                       btf_dump_printf(d, "typedef %s %s;\n\n",
+                                       missing_base_types[i][1], name);
+                       break;
+               }
+       }
+}
+
 static void btf_dump_emit_enum_fwd(struct btf_dump *d, __u32 id,
                                   const struct btf_type *t)
 {