perf script: Fix script_fetch_insn for more than just x86

The script_fetch_insn code was only supported on natively running x86.

Implement a crude elf_machine_max_instruction_length function and use to
give an instruction length on more than just x86.

Use the ELF machine to determine the length to use to support
cross-architecture development.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shimin Guo <shimin.guo@skydio.com>
Cc: Yujie Liu <yujie.liu@intel.com>
[ Conditionally define EM_CSKY and EM_LOONGARCH for older distros ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 0 insertions, 28 deletions

diff --git a/tools/perf/arch/x86/util/Build b/tools/perf/arch/x86/util/Build
index fad256252bb9..76127eefde8b 100644
--- a/tools/perf/arch/x86/util/Build
+++ b/tools/perf/arch/x86/util/Build
@@ -14,6 +14,5 @@ perf-util-y += iostat.o
 perf-util-$(CONFIG_LOCAL_LIBUNWIND)    += unwind-libunwind.o
 
 perf-util-y += auxtrace.o
-perf-util-y += archinsn.o
 perf-util-y += intel-pt.o
 perf-util-y += intel-bts.o
diff --git a/tools/perf/arch/x86/util/archinsn.c b/tools/perf/arch/x86/util/archinsn.c
deleted file mode 100644
index 546feda08428..000000000000
--- a/tools/perf/arch/x86/util/archinsn.c
+++ /dev/null
@@ -1,27 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include "archinsn.h"
-#include "event.h"
-#include "machine.h"
-#include "thread.h"
-#include "symbol.h"
-#include "../../../../arch/x86/include/asm/insn.h"
-
-void arch_fetch_insn(struct perf_sample *sample,
-		     struct thread *thread,
-		     struct machine *machine)
-{
-	struct insn insn;
-	int len, ret;
-	bool is64bit = false;
-
-	if (!sample->ip)
-		return;
-	len = thread__memcpy(thread, machine, sample->insn, sample->ip, sizeof(sample->insn), &is64bit);
-	if (len <= 0)
-		return;
-
-	ret = insn_decode(&insn, sample->insn, len,
-			  is64bit ? INSN_MODE_64 : INSN_MODE_32);
-	if (ret >= 0 && insn.length <= len)
-		sample->insn_len = insn.length;
-}