[PATCH v3 11/20] perf loongarch: Remove dwarf-regs.c

Ian Rogers
2024-10-17T00:57:45Z

The file just provides the function get_arch_regstr, however, if in
the only caller get_dwarf_regstr EM_HOST is used for the EM_NONE case
the function can never be called. So remove as dead code. Tidy up the
EM_NONE cases for loongarch in dwarf-regs.c.

Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/arch/loongarch/util/Build | 1 -
tools/perf/arch/loongarch/util/dwarf-regs.c | 34 ---------------------
tools/perf/util/dwarf-regs.c | 4 +--
tools/perf/util/include/dwarf-regs.h | 3 +-
4 files changed, 4 insertions(+), 38 deletions(-)
delete mode 100644 tools/perf/arch/loongarch/util/dwarf-regs.c

diff --git a/tools/perf/arch/loongarch/util/Build b/tools/perf/arch/loongarch/util/Build
index 06ff95394921..0aa31986ecb5 100644
--- a/tools/perf/arch/loongarch/util/Build
+++ b/tools/perf/arch/loongarch/util/Build
@@ -1,7 +1,6 @@
perf-util-y += header.o
perf-util-y += perf_regs.o

-perf-util-$(CONFIG_LIBDW) += dwarf-regs.o
perf-util-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o
perf-util-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
perf-util-$(CONFIG_LIBTRACEEVENT) += kvm-stat.o
diff --git a/tools/perf/arch/loongarch/util/dwarf-regs.c b/tools/perf/arch/loongarch/util/dwarf-regs.c
deleted file mode 100644
index bee08fdcf2fd..000000000000
--- a/tools/perf/arch/loongarch/util/dwarf-regs.c
+++ /dev/null
@@ -1,34 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * dwarf-regs.c : Mapping of DWARF debug register numbers into register names.
- *
- * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
- */
-
-#include <stdio.h>
-#include <errno.h> /* for EINVAL */
-#include <string.h> /* for strcmp */
-#include <dwarf-regs.h>
-
-struct pt_regs_dwarfnum {
- const char *name;
- unsigned int dwarfnum;
-};
-
-static struct pt_regs_dwarfnum loongarch_gpr_table[] = {
- {"%r0", 0}, {"%r1", 1}, {"%r2", 2}, {"%r3", 3},
- {"%r4", 4}, {"%r5", 5}, {"%r6", 6}, {"%r7", 7},
- {"%r8", 8}, {"%r9", 9}, {"%r10", 10}, {"%r11", 11},
- {"%r12", 12}, {"%r13", 13}, {"%r14", 14}, {"%r15", 15},
- {"%r16", 16}, {"%r17", 17}, {"%r18", 18}, {"%r19", 19},
- {"%r20", 20}, {"%r21", 21}, {"%r22", 22}, {"%r23", 23},
- {"%r24", 24}, {"%r25", 25}, {"%r26", 26}, {"%r27", 27},
- {"%r28", 28}, {"%r29", 29}, {"%r30", 30}, {"%r31", 31},
- {NULL, 0}
-};
-
-const char *get_arch_regstr(unsigned int n)
-{
- n %= 32;
- return loongarch_gpr_table[n].name;
-}
diff --git a/tools/perf/util/dwarf-regs.c b/tools/perf/util/dwarf-regs.c
index 9a76f83af62c..efc41d0fbee9 100644
--- a/tools/perf/util/dwarf-regs.c
+++ b/tools/perf/util/dwarf-regs.c
@@ -32,7 +32,7 @@
const char *get_dwarf_regstr(unsigned int n, unsigned int machine, unsigned int flags)
{
#if EM_HOST == EM_X86_64 || EM_HOST == EM_386 || EM_HOST == EM_AARCH64 || EM_HOST == EM_ARM \
- || EM_HOST == EM_CSKY
+ || EM_HOST == EM_CSKY || EM_HOST == EM_LOONGARCH
if (machine == EM_NONE) {
/* Generic arch - use host arch */
machine = EM_HOST;
@@ -40,7 +40,7 @@ const char *get_dwarf_regstr(unsigned int n, unsigned int machine, unsigned int
#endif
switch (machine) {
#if EM_HOST != EM_X86_64 && EM_HOST != EM_386 && EM_HOST != EM_AARCH64 && EM_HOST != EM_ARM \
- && EM_HOST != EM_CSKY
+ && EM_HOST != EM_CSKY && EM_HOST != EM_LOONGARCH
case EM_NONE: /* Generic arch - use host arch */
return get_arch_regstr(n);
#endif
diff --git a/tools/perf/util/include/dwarf-regs.h b/tools/perf/util/include/dwarf-regs.h
index b72d9d308ce4..4f205a58db89 100644
--- a/tools/perf/util/include/dwarf-regs.h
+++ b/tools/perf/util/include/dwarf-regs.h
@@ -79,7 +79,8 @@
#define DWARF_REG_FB 0xd3affb /* random number */

#ifdef HAVE_LIBDW_SUPPORT
-#if !defined(__x86_64__) && !defined(__i386__) && !defined(__aarch64__) && !defined(__arm__)
+#if !defined(__x86_64__) && !defined(__i386__) && !defined(__aarch64__) && !defined(__arm__) \
+ && !defined(__loongarch__)
const char *get_arch_regstr(unsigned int n);
#endif