perf dwarf-regs: Move csky dwarf-regs out of arch

Move arch/csky/util/dwarf-regs.c to util/dwarf-regs-csky.c and compile
in unconditionally. To avoid get_arch_regstr being duplicated, rename
to get_csky_regstr and add to get_dwarf_regstr switch.

Update #ifdefs to allow ABI V1 and V2 tables at the same
time. Determine the table from the ELF flags.

Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Anup Patel <anup@brainfault.org>
Cc: Yang Jihong <yangjihong@bytedance.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Shenlin Liang <liangshenlin@eswincomputing.com>
Cc: Nick Terrell <terrelln@fb.com>
Cc: Guilherme Amadio <amadio@gentoo.org>
Cc: Steinar H. Gunderson <sesse@google.com>
Cc: Changbin Du <changbin.du@huawei.com>
Cc: Alexander Lobakin <aleksander.lobakin@intel.com>
Cc: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: James Clark <james.clark@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Chen Pei <cp0613@linux.alibaba.com>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: Oliver Upton <oliver.upton@linux.dev>
Cc: Aditya Gupta <adityag@linux.ibm.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-riscv@lists.infradead.org
Cc: Bibo Mao <maobibo@loongson.cn>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Atish Patra <atishp@rivosinc.com>
Cc: Dima Kogan <dima@secretsauce.net>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Dr. David Alan Gilbert <linux@treblig.org>
Cc: linux-csky@vger.kernel.org
Link: https://lore.kernel.org/r/20241108234606.429459-11-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

Author: captain5050

tools/perf/arch/csky/util/Build

@@ -1,4 +1,3 @@
 perf-util-y += perf_regs.o
 
-perf-util-$(CONFIG_LIBDW) += dwarf-regs.o
 perf-util-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o

tools/perf/util/Build

@@ -204,6 +204,7 @@ 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-csky.o
 perf-util-$(CONFIG_LIBDW) += dwarf-regs-x86.o
 perf-util-$(CONFIG_LIBDW) += debuginfo.o
 perf-util-$(CONFIG_LIBDW) += annotate-data.o

tools/perf/arch/csky/util/dwarf-regs.c tools/perf/util/dwarf-regs-csky.ctools/perf/arch/csky/util/dwarf-regs.c renamed to tools/perf/util/dwarf-regs-csky.c

@@ -5,9 +5,8 @@
 #include <stddef.h>
 #include <dwarf-regs.h>
 
-#if defined(__CSKYABIV2__)
-#define CSKY_MAX_REGS 73
-const char *csky_dwarf_regs_table[CSKY_MAX_REGS] = {
+#define CSKY_ABIV2_MAX_REGS 73
+const char *csky_dwarf_regs_table_abiv2[CSKY_ABIV2_MAX_REGS] = {
 	/* r0 ~ r8 */
 	"%a0", "%a1", "%a2", "%a3", "%regs0", "%regs1", "%regs2", "%regs3",
 	/* r9 ~ r15 */
@@ -26,9 +25,9 @@ const char *csky_dwarf_regs_table[CSKY_MAX_REGS] = {
 	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
 	"%epc",
 };
-#else
-#define CSKY_MAX_REGS 57
-const char *csky_dwarf_regs_table[CSKY_MAX_REGS] = {
+
+#define CSKY_ABIV1_MAX_REGS 57
+const char *csky_dwarf_regs_table_abiv1[CSKY_ABIV1_MAX_REGS] = {
 	/* r0 ~ r8 */
 	"%sp", "%regs9", "%a0", "%a1", "%a2", "%a3", "%regs0", "%regs1",
 	/* r9 ~ r15 */
@@ -41,9 +40,11 @@ const char *csky_dwarf_regs_table[CSKY_MAX_REGS] = {
 	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
 	"%epc",
 };
-#endif
 
-const char *get_arch_regstr(unsigned int n)
+const char *get_csky_regstr(unsigned int n, unsigned int flags)
 {
-	return (n < CSKY_MAX_REGS) ? csky_dwarf_regs_table[n] : NULL;
+	if (flags & EF_CSKY_ABIV2)
+		return (n < CSKY_ABIV2_MAX_REGS) ? csky_dwarf_regs_table_abiv2[n] : NULL;
+
+	return (n < CSKY_ABIV1_MAX_REGS) ? csky_dwarf_regs_table_abiv1[n] : NULL;
 }

tools/perf/util/dwarf-regs.c

@@ -29,17 +29,18 @@
 #define __get_dwarf_regstr(tbl, n) (((n) < ARRAY_SIZE(tbl)) ? (tbl)[(n)] : NULL)
 
 /* Return architecture dependent register string (for kprobe-tracer) */
-const char *get_dwarf_regstr(unsigned int n, unsigned int machine,
-			     unsigned int flags __maybe_unused)
+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
+#if EM_HOST == EM_X86_64 || EM_HOST == EM_386 || EM_HOST == EM_AARCH64 || EM_HOST == EM_ARM \
+    || EM_HOST == EM_CSKY
 	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 && EM_HOST != EM_AARCH64 && EM_HOST != EM_ARM
+#if EM_HOST != EM_X86_64 && EM_HOST != EM_386 && EM_HOST != EM_AARCH64 && EM_HOST != EM_ARM \
+    && EM_HOST != EM_CSKY
 	case EM_NONE:	/* Generic arch - use host arch */
 		return get_arch_regstr(n);
 #endif
@@ -51,6 +52,8 @@ const char *get_dwarf_regstr(unsigned int n, unsigned int machine,
 		return __get_dwarf_regstr(arm_regstr_tbl, n);
 	case EM_AARCH64:
 		return __get_dwarf_regstr(aarch64_regstr_tbl, n);
+	case EM_CSKY:
+		return get_csky_regstr(n, flags);
 	case EM_SH:
 		return __get_dwarf_regstr(sh_regstr_tbl, n);
 	case EM_S390:

tools/perf/util/include/dwarf-regs.h

@@ -93,6 +93,8 @@
 const char *get_arch_regstr(unsigned int n);
 #endif
 
+const char *get_csky_regstr(unsigned int n, unsigned int flags);
+
 /**
  * get_dwarf_regstr() - Returns ftrace register string from DWARF regnum.
  * @n: DWARF register number.