[PATCH] perf llvm: Specify features="+all" for aarch64

[Peter Collingbourne <pcc@google.com>]

This is consistent with what llvm-objdump does (see [1]) and allows
the LLVM disassembler to disassemble instructions not in the base
instruction set.

[1] https://reviews.llvm.org/D127741

Link: https://linux-review.googlesource.com/id/I52e4fef18d2e12b45f875231fa9d3efff2538fd4
Signed-off-by: Peter Collingbourne <pcc@google.com>
---
 tools/perf/util/llvm.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/llvm.c b/tools/perf/util/llvm.c
index 87fceae8488a7..44eff99970fe2 100644
--- a/tools/perf/util/llvm.c
+++ b/tools/perf/util/llvm.c
@@ -153,11 +153,17 @@ int symbol__disassemble_llvm(const char *filename, struct symbol *sym,
 					  /*get_op_info=*/NULL, symbol_lookup_callback);
 	} else {
 		char triplet[64];
+		const char *features = NULL;
 
 		scnprintf(triplet, sizeof(triplet), "%s-linux-gnu",
 			  args->arch->name);
-		disasm = LLVMCreateDisasm(triplet, &storage, /*tag_type=*/0,
-					  /*get_op_info=*/NULL, symbol_lookup_callback);
+		if (args->arch->id.e_machine == EM_AARCH64)
+			features = "+all";
+		disasm = LLVMCreateDisasmCPUFeatures(triplet, /*cpu=*/"",
+						     features, &storage,
+						     /*tag_type=*/0,
+						     /*get_op_info=*/NULL,
+						     symbol_lookup_callback);
 	}
 
 	if (disasm == NULL)
-- 
2.53.0.473.g4a7958ca14-goog