[PATCH v3 13/20] perf dwarf-regs: Move powerpc dwarf-regs out of arch

Ian Rogers
2024-10-17T01:27:04Z

Move arch/powerpc/util/dwarf-regs.c to util/dwarf-regs-powerpc.c and
compile in unconditionally. get_arch_regstr is redundant when EM_NONE
is treated as EM_HOST so remove and update dwarf-regs.c conditions.
Make get_powerpc_regs unconditionally available whwn libdw is.

Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/arch/powerpc/util/Build | 1 -
tools/perf/arch/powerpc/util/dwarf-regs.c | 141 ----------------------
tools/perf/util/Build | 1 +
tools/perf/util/dwarf-regs-powerpc.c | 61 ++++++++++
tools/perf/util/dwarf-regs.c | 6 +-
tools/perf/util/include/dwarf-regs.h | 9 +-
6 files changed, 70 insertions(+), 149 deletions(-)
delete mode 100644 tools/perf/arch/powerpc/util/dwarf-regs.c
create mode 100644 tools/perf/util/dwarf-regs-powerpc.c

diff --git a/tools/perf/arch/powerpc/util/Build b/tools/perf/arch/powerpc/util/Build
index 3d979480a188..ed82715080f9 100644
--- a/tools/perf/arch/powerpc/util/Build
+++ b/tools/perf/arch/powerpc/util/Build
@@ -7,7 +7,6 @@ perf-util-y += sym-handling.o
perf-util-y += evsel.o
perf-util-y += event.o

-perf-util-$(CONFIG_LIBDW) += dwarf-regs.o
perf-util-$(CONFIG_LIBDW) += skip-callchain-idx.o

perf-util-$(CONFIG_LIBUNWIND) += unwind-libunwind.o
diff --git a/tools/perf/arch/powerpc/util/dwarf-regs.c b/tools/perf/arch/powerpc/util/dwarf-regs.c
deleted file mode 100644
index 23846c59a522..000000000000
--- a/tools/perf/arch/powerpc/util/dwarf-regs.c
+++ /dev/null
@@ -1,141 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Mapping of DWARF debug register numbers into register names.
- *
- * Copyright (C) 2010 Ian Munsie, IBM Corporation.
- */
-
-#include <stddef.h>
-#include <errno.h>
-#include <string.h>
-#include <dwarf-regs.h>
-#include <linux/kernel.h>
-#include <linux/stringify.h>
-
-struct regs_dwarfnum {
- const char *name;
- unsigned int dwarfnum;
-};
-
-#define REG_DWARFNUM_NAME(r, num) \
- {.name = __stringify(%)__stringify(r), .dwarfnum = num}
-#define GPR_DWARFNUM_NAME(num) \
- {.name = __stringify(%gpr##num), .dwarfnum = num}
-#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
-
-/*
- * Reference:
- * http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html
- */
-static const struct regs_dwarfnum regdwarfnum_table[] = {
- GPR_DWARFNUM_NAME(0),
- GPR_DWARFNUM_NAME(1),
- GPR_DWARFNUM_NAME(2),
- GPR_DWARFNUM_NAME(3),
- GPR_DWARFNUM_NAME(4),
- GPR_DWARFNUM_NAME(5),
- GPR_DWARFNUM_NAME(6),
- GPR_DWARFNUM_NAME(7),
- GPR_DWARFNUM_NAME(8),
- GPR_DWARFNUM_NAME(9),
- GPR_DWARFNUM_NAME(10),
- GPR_DWARFNUM_NAME(11),
- GPR_DWARFNUM_NAME(12),
- GPR_DWARFNUM_NAME(13),
- GPR_DWARFNUM_NAME(14),
- GPR_DWARFNUM_NAME(15),
- GPR_DWARFNUM_NAME(16),
- GPR_DWARFNUM_NAME(17),
- GPR_DWARFNUM_NAME(18),
- GPR_DWARFNUM_NAME(19),
- GPR_DWARFNUM_NAME(20),
- GPR_DWARFNUM_NAME(21),
- GPR_DWARFNUM_NAME(22),
- GPR_DWARFNUM_NAME(23),
- GPR_DWARFNUM_NAME(24),
- GPR_DWARFNUM_NAME(25),
- GPR_DWARFNUM_NAME(26),
- GPR_DWARFNUM_NAME(27),
- GPR_DWARFNUM_NAME(28),
- GPR_DWARFNUM_NAME(29),
- GPR_DWARFNUM_NAME(30),
- GPR_DWARFNUM_NAME(31),
- REG_DWARFNUM_NAME(msr, 66),
- REG_DWARFNUM_NAME(ctr, 109),
- REG_DWARFNUM_NAME(link, 108),
- REG_DWARFNUM_NAME(xer, 101),
- REG_DWARFNUM_NAME(dar, 119),
- REG_DWARFNUM_NAME(dsisr, 118),
- REG_DWARFNUM_END,
-};
-
-/**
- * get_arch_regstr() - lookup register name from it's DWARF register number
- * @n: the DWARF register number
- *
- * get_arch_regstr() returns the name of the register in struct
- * regdwarfnum_table from it's DWARF register number. If the register is not
- * found in the table, this returns NULL;
- */
-const char *get_arch_regstr(unsigned int n)
-{
- const struct regs_dwarfnum *roff;
-
- for (roff = regdwarfnum_table; roff->name != NULL; roff++)
- if (roff->dwarfnum == n)
- return roff->name;
- return NULL;
-}
-
-#define PPC_OP(op) (((op) >> 26) & 0x3F)
-#define PPC_RA(a) (((a) >> 16) & 0x1f)
-#define PPC_RT(t) (((t) >> 21) & 0x1f)
-#define PPC_RB(b) (((b) >> 11) & 0x1f)
-#define PPC_D(D) ((D) & 0xfffe)
-#define PPC_DS(DS) ((DS) & 0xfffc)
-#define OP_LD 58
-#define OP_STD 62
-
-static int get_source_reg(u32 raw_insn)
-{
- return PPC_RA(raw_insn);
-}
-
-static int get_target_reg(u32 raw_insn)
-{
- return PPC_RT(raw_insn);
-}
-
-static int get_offset_opcode(u32 raw_insn)
-{
- int opcode = PPC_OP(raw_insn);
-
- /* DS- form */
- if ((opcode == OP_LD) || (opcode == OP_STD))
- return PPC_DS(raw_insn);
- else
- return PPC_D(raw_insn);
-}
-
-/*
- * Fills the required fields for op_loc depending on if it
- * is a source or target.
- * D form: ins RT,D(RA) -> src_reg1 = RA, offset = D, dst_reg1 = RT
- * DS form: ins RT,DS(RA) -> src_reg1 = RA, offset = DS, dst_reg1 = RT
- * X form: ins RT,RA,RB -> src_reg1 = RA, src_reg2 = RB, dst_reg1 = RT
- */
-void get_powerpc_regs(u32 raw_insn, int is_source,
- struct annotated_op_loc *op_loc)
-{
- if (is_source)
- op_loc->reg1 = get_source_reg(raw_insn);
- else
- op_loc->reg1 = get_target_reg(raw_insn);
-
- if (op_loc->multi_regs)
- op_loc->reg2 = PPC_RB(raw_insn);
-
- /* TODO: Implement offset handling for X Form */
- if ((op_loc->mem_ref) && (PPC_OP(raw_insn) != 31))
- op_loc->offset = get_offset_opcode(raw_insn);
-}
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 99ae4e2802b8..eeab8684ddcc 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -204,6 +204,7 @@ 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-powerpc.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/util/dwarf-regs-powerpc.c b/tools/perf/util/dwarf-regs-powerpc.c
new file mode 100644
index 000000000000..caf77a234c78
--- /dev/null
+++ b/tools/perf/util/dwarf-regs-powerpc.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Mapping of DWARF debug register numbers into register names.
+ *
+ * Copyright (C) 2010 Ian Munsie, IBM Corporation.
+ */
+
+#include <dwarf-regs.h>
+
+#define PPC_OP(op) (((op) >> 26) & 0x3F)
+#define PPC_RA(a) (((a) >> 16) & 0x1f)
+#define PPC_RT(t) (((t) >> 21) & 0x1f)
+#define PPC_RB(b) (((b) >> 11) & 0x1f)
+#define PPC_D(D) ((D) & 0xfffe)
+#define PPC_DS(DS) ((DS) & 0xfffc)
+#define OP_LD 58
+#define OP_STD 62
+
+static int get_source_reg(u32 raw_insn)
+{
+ return PPC_RA(raw_insn);
+}
+
+static int get_target_reg(u32 raw_insn)
+{
+ return PPC_RT(raw_insn);
+}
+
+static int get_offset_opcode(u32 raw_insn)
+{
+ int opcode = PPC_OP(raw_insn);
+
+ /* DS- form */
+ if ((opcode == OP_LD) || (opcode == OP_STD))
+ return PPC_DS(raw_insn);
+ else
+ return PPC_D(raw_insn);
+}
+
+/*
+ * Fills the required fields for op_loc depending on if it
+ * is a source or target.
+ * D form: ins RT,D(RA) -> src_reg1 = RA, offset = D, dst_reg1 = RT
+ * DS form: ins RT,DS(RA) -> src_reg1 = RA, offset = DS, dst_reg1 = RT
+ * X form: ins RT,RA,RB -> src_reg1 = RA, src_reg2 = RB, dst_reg1 = RT
+ */
+void get_powerpc_regs(u32 raw_insn, int is_source,
+ struct annotated_op_loc *op_loc)
+{
+ if (is_source)
+ op_loc->reg1 = get_source_reg(raw_insn);
+ else
+ op_loc->reg1 = get_target_reg(raw_insn);
+
+ if (op_loc->multi_regs)
+ op_loc->reg2 = PPC_RB(raw_insn);
+
+ /* TODO: Implement offset handling for X Form */
+ if ((op_loc->mem_ref) && (PPC_OP(raw_insn) != 31))
+ op_loc->offset = get_offset_opcode(raw_insn);
+}
diff --git a/tools/perf/util/dwarf-regs.c b/tools/perf/util/dwarf-regs.c
index d536964df43c..3d98c2bf6035 100644
--- a/tools/perf/util/dwarf-regs.c
+++ b/tools/perf/util/dwarf-regs.c
@@ -32,7 +32,8 @@
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_LOONGARCH || EM_HOST == EM_MIPS
+ || EM_HOST == EM_CSKY || EM_HOST == EM_LOONGARCH || EM_HOST == EM_MIPS || EM_HOST == EM_PPC \
+ || EM_HOST == EM_PPC64
if (machine == EM_NONE) {
/* Generic arch - use host arch */
machine = EM_HOST;
@@ -40,7 +41,8 @@ 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_LOONGARCH && EM_HOST != EM_MIPS
+ && EM_HOST != EM_CSKY && EM_HOST != EM_LOONGARCH && EM_HOST != EM_MIPS && EM_HOST != EM_PPC \
+ && EM_HOST != EM_PPC64
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 1f771b635789..1763280855ce 100644
--- a/tools/perf/util/include/dwarf-regs.h
+++ b/tools/perf/util/include/dwarf-regs.h
@@ -80,7 +80,8 @@

#ifdef HAVE_LIBDW_SUPPORT
#if !defined(__x86_64__) && !defined(__i386__) && !defined(__aarch64__) && !defined(__arm__) \
- && !defined(__loongarch__) && !defined(__mips__)
+ && !defined(__loongarch__) && !defined(__mips__) && !defined(__powerpc__) \
+ && !defined(__powerpc64__)
const char *get_arch_regstr(unsigned int n);
#endif

@@ -107,6 +108,8 @@ int get_arch_regnum(const char *name);
*/
int get_dwarf_regnum(const char *name, unsigned int machine, unsigned int flags);

+void get_powerpc_regs(u32 raw_insn, int is_source, struct annotated_op_loc *op_loc);
+
#else /* HAVE_LIBDW_SUPPORT */

static inline int get_dwarf_regnum(const char *name __maybe_unused,
@@ -115,16 +118,12 @@ static inline int get_dwarf_regnum(const char *name __maybe_unused,
{
return -1;
}
-#endif

-#if !defined(__powerpc__) || !defined(HAVE_LIBDW_SUPPORT)
static inline void get_powerpc_regs(u32 raw_insn __maybe_unused, int is_source __maybe_unused,
struct annotated_op_loc *op_loc __maybe_unused)
{
return;
}
-#else
-void get_powerpc_regs(u32 raw_insn, int is_source, struct annotated_op_loc *op_loc);
#endif

#endif