[PATCH v4 07/20] perf dwarf-regs: Move x86 dwarf-regs out of arch

[Ian Rogers <irogers@google.com>]

Move arch/x86/util/dwarf-regs.c to util/dwarf-regs-x86.c and compile
in unconditionally. To avoid get_arch_regnum being duplicated, rename
to get_x86_regnum and add to get_dwarf_regnum switch.

For get_arch_regstr, this was unused on x86 unless the machine type
was EM_NONE. Map that case to EM_HOST and remove get_arch_regstr from
dwarf-regs-x86.c.

Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/arch/x86/util/Build                |  3 ---
 tools/perf/util/Build                         |  1 +
 .../dwarf-regs.c => util/dwarf-regs-x86.c}    | 24 +------------------
 tools/perf/util/dwarf-regs.c                  | 17 +++++++++++++
 tools/perf/util/include/dwarf-regs.h          |  8 +++++++
 5 files changed, 27 insertions(+), 26 deletions(-)
 rename tools/perf/{arch/x86/util/dwarf-regs.c => util/dwarf-regs-x86.c} (77%)

diff --git a/tools/perf/arch/x86/util/Build b/tools/perf/arch/x86/util/Build
index bc56a8e70f34..848327378694 100644
--- a/tools/perf/arch/x86/util/Build
+++ b/tools/perf/arch/x86/util/Build
@@ -11,9 +11,6 @@ perf-util-y += mem-events.o
 perf-util-y += evsel.o
 perf-util-y += iostat.o
 
-perf-util-$(CONFIG_LIBDW) += dwarf-regs.o
-perf-util-$(CONFIG_BPF_PROLOGUE) += dwarf-regs.o
-
 perf-util-$(CONFIG_LOCAL_LIBUNWIND)    += unwind-libunwind.o
 perf-util-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
 
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 1eedead5f2f2..4c615611b9d7 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -203,6 +203,7 @@ endif
 perf-util-$(CONFIG_LIBDW) += probe-finder.o
 perf-util-$(CONFIG_LIBDW) += dwarf-aux.o
 perf-util-$(CONFIG_LIBDW) += dwarf-regs.o
+perf-util-$(CONFIG_LIBDW) += dwarf-regs-x86.o
 perf-util-$(CONFIG_LIBDW) += debuginfo.o
 perf-util-$(CONFIG_LIBDW) += annotate-data.o
 
diff --git a/tools/perf/arch/x86/util/dwarf-regs.c b/tools/perf/util/dwarf-regs-x86.c
similarity index 77%
rename from tools/perf/arch/x86/util/dwarf-regs.c
rename to tools/perf/util/dwarf-regs-x86.c
index 530905118cd4..7a55c65e8da6 100644
--- a/tools/perf/arch/x86/util/dwarf-regs.c
+++ b/tools/perf/util/dwarf-regs-x86.c
@@ -11,28 +11,6 @@
 #include <linux/kernel.h> /* for ARRAY_SIZE */
 #include <dwarf-regs.h>
 
-#define DEFINE_DWARF_REGSTR_TABLE 1
-#include "dwarf-regs-table.h"
-
-/* Return architecture dependent register string (for kprobe-tracer) */
-const char *get_arch_regstr(unsigned int n)
-{
-#if defined(__i386__)
-	size_t len = ARRAY_SIZE(x86_32_regstr_tbl);
-#else
-	size_t len = ARRAY_SIZE(x86_64_regstr_tbl);
-#endif
-
-	if (n >= len)
-		return NULL;
-
-#if defined(__i386__)
-	return x86_32_regstr_tbl[n];
-#else
-	return x86_64_regstr_tbl[n];
-#endif
-}
-
 struct dwarf_regs_idx {
 	const char *name;
 	int idx;
@@ -58,7 +36,7 @@ static const struct dwarf_regs_idx x86_regidx_table[] = {
 	{ "rip", DWARF_REG_PC },
 };
 
-int get_arch_regnum(const char *name)
+int get_x86_regnum(const char *name)
 {
 	unsigned int i;
 
diff --git a/tools/perf/util/dwarf-regs.c b/tools/perf/util/dwarf-regs.c
index 86b3ef638fbb..eac99a246737 100644
--- a/tools/perf/util/dwarf-regs.c
+++ b/tools/perf/util/dwarf-regs.c
@@ -32,9 +32,17 @@
 const char *get_dwarf_regstr(unsigned int n, unsigned int machine,
 			     unsigned int flags __maybe_unused)
 {
+#if EM_HOST == EM_X86_64 || EM_HOST == EM_386
+	if (machine == EM_NONE) {
+		/* Generic arch - use host arch */
+		machine = EM_HOST;
+	}
+#endif
 	switch (machine) {
+#if EM_HOST != EM_X86_64 && EM_HOST != EM_386
 	case EM_NONE:	/* Generic arch - use host arch */
 		return get_arch_regstr(n);
+#endif
 	case EM_386:
 		return __get_dwarf_regstr(x86_32_regstr_tbl, n);
 	case EM_X86_64:
@@ -65,10 +73,12 @@ const char *get_dwarf_regstr(unsigned int n, unsigned int machine,
 	return NULL;
 }
 
+#if EM_HOST != EM_X86_64 && EM_HOST != EM_386
 __weak int get_arch_regnum(const char *name __maybe_unused)
 {
 	return -ENOTSUP;
 }
+#endif
 
 /* Return DWARF register number from architecture register name */
 int get_dwarf_regnum(const char *name, unsigned int machine, unsigned int flags __maybe_unused)
@@ -90,9 +100,16 @@ int get_dwarf_regnum(const char *name, unsigned int machine, unsigned int flags
 		machine = EM_HOST;
 	}
 	switch (machine) {
+#if EM_HOST != EM_X86_64 && EM_HOST != EM_386
 	case EM_HOST:
 		reg = get_arch_regnum(regname);
 		break;
+#endif
+	case EM_X86_64:
+		fallthrough;
+	case EM_386:
+		reg = get_x86_regnum(regname);
+		break;
 	default:
 		pr_err("ELF MACHINE %x is not supported.\n", machine);
 	}
diff --git a/tools/perf/util/include/dwarf-regs.h b/tools/perf/util/include/dwarf-regs.h
index 0ef428d07bcc..6aa66c375942 100644
--- a/tools/perf/util/include/dwarf-regs.h
+++ b/tools/perf/util/include/dwarf-regs.h
@@ -89,7 +89,10 @@
 #define DWARF_REG_FB  0xd3affb /* random number */
 
 #ifdef HAVE_LIBDW_SUPPORT
+#if !defined(__x86_64__) && !defined(__i386__)
 const char *get_arch_regstr(unsigned int n);
+#endif
+
 /**
  * get_dwarf_regstr() - Returns ftrace register string from DWARF regnum.
  * @n: DWARF register number.
@@ -98,7 +101,12 @@ const char *get_arch_regstr(unsigned int n);
  */
 const char *get_dwarf_regstr(unsigned int n, unsigned int machine, unsigned int flags);
 
+int get_x86_regnum(const char *name);
+
+#if !defined(__x86_64__) && !defined(__i386__)
 int get_arch_regnum(const char *name);
+#endif
+
 /*
  * get_dwarf_regnum - Returns DWARF regnum from register name
  * name: architecture register name
-- 
2.47.0.277.g8800431eea-goog