perf disasm: Rework the string arch__is to use the ELF machine

Add new arch__is_x86 and arch__is_powerpc functions that avoid string
comparisons and use the ELF machine.

Remove arch__is() that is no longer used.

Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Aditya Bodkhe <aditya.b1@linux.ibm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Athira Rajeev <atrajeev@linux.ibm.com>
Cc: Bill Wendling <morbo@google.com>
Cc: Dr. David Alan Gilbert <linux@treblig.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Julia Lawall <Julia.Lawall@inria.fr>
Cc: Justin Stitt <justinstitt@google.com>
Cc: Krzysztof Łopatowski <krzysztof.m.lopatowski@gmail.com>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <nick.desaulniers+lkml@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <pjw@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sergei Trofimovich <slyich@gmail.com>
Cc: Shimin Guo <shimin.guo@skydio.com>
Cc: Suchit Karunakaran <suchitkarunakaran@gmail.com>
Cc: Thomas Falcon <thomas.falcon@intel.com>
Cc: Tianyou Li <tianyou.li@intel.com>
Cc: Will Deacon <will@kernel.org>
Cc: Zecheng Li <zecheng@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

6 files changed, 27 insertions, 21 deletions

diff --git a/tools/perf/util/annotate-data.c b/tools/perf/util/annotate-data.c
index edfcd6e9df9c..44fbd41e3845 100644
--- a/tools/perf/util/annotate-data.c
+++ b/tools/perf/util/annotate-data.c
@@ -165,7 +165,7 @@ static void init_type_state(struct type_state *state, const struct arch *arch)
 	memset(state, 0, sizeof(*state));
 	INIT_LIST_HEAD(&state->stack_vars);
 
-	if (arch__is(arch, "x86")) {
+	if (arch__is_x86(arch)) {
 		state->regs[0].caller_saved = true;
 		state->regs[1].caller_saved = true;
 		state->regs[2].caller_saved = true;
@@ -526,7 +526,7 @@ static enum type_match_result check_variable(struct data_loc_info *dloc,
 		needs_pointer = false;
 	else if (reg == dloc->fbreg || is_fbreg)
 		needs_pointer = false;
-	else if (arch__is(dloc->arch, "x86") && reg == X86_REG_SP)
+	else if (arch__is_x86(dloc->arch) && reg == X86_REG_SP)
 		needs_pointer = false;
 
 	/* Get the type of the variable */
@@ -1071,7 +1071,7 @@ static void delete_var_types(struct die_var_type *var_types)
 /* should match to is_stack_canary() in util/annotate.c */
 static void setup_stack_canary(struct data_loc_info *dloc)
 {
-	if (arch__is(dloc->arch, "x86")) {
+	if (arch__is_x86(dloc->arch)) {
 		dloc->op->segment = INSN_SEG_X86_GS;
 		dloc->op->imm = true;
 		dloc->op->offset = 40;
@@ -1311,7 +1311,7 @@ check_kernel:
 
 		/* Direct this-cpu access like "%gs:0x34740" */
 		if (dloc->op->segment == INSN_SEG_X86_GS && dloc->op->imm &&
-		    arch__is(dloc->arch, "x86")) {
+		    arch__is_x86(dloc->arch)) {
 			pr_debug_dtp("this-cpu var");
 
 			addr = dloc->op->offset;
@@ -1397,7 +1397,7 @@ out:
 
 static int arch_supports_insn_tracking(struct data_loc_info *dloc)
 {
-	if ((arch__is(dloc->arch, "x86")) || (arch__is(dloc->arch, "powerpc")))
+	if ((arch__is_x86(dloc->arch)) || (arch__is_powerpc(dloc->arch)))
 		return 1;
 	return 0;
 }
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 132af2556aec..79702072568b 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -2474,7 +2474,7 @@ static int extract_reg_offset(const struct arch *arch, const char *str,
 	 * %gs:0x18(%rbx).  In that case it should skip the part.
 	 */
 	if (*str == arch->objdump.register_char) {
-		if (arch__is(arch, "x86")) {
+		if (arch__is_x86(arch)) {
 			/* FIXME: Handle other segment registers */
 			if (!strncmp(str, "%gs:", 4))
 				op_loc->segment = INSN_SEG_X86_GS;
@@ -2571,7 +2571,7 @@ int annotate_get_insn_location(const struct arch *arch, struct disasm_line *dl,
 		op_loc->reg2 = -1;
 
 		if (insn_str == NULL) {
-			if (!arch__is(arch, "powerpc"))
+			if (!arch__is_powerpc(arch))
 				continue;
 		}
 
@@ -2580,7 +2580,7 @@ int annotate_get_insn_location(const struct arch *arch, struct disasm_line *dl,
 		 * required fields for op_loc, ie reg1, reg2, offset from the
 		 * raw instruction.
 		 */
-		if (arch__is(arch, "powerpc")) {
+		if (arch__is_powerpc(arch)) {
 			op_loc->mem_ref = mem_ref;
 			op_loc->multi_regs = multi_regs;
 			get_powerpc_regs(dl->raw.raw_insn, !i, op_loc);
@@ -2591,7 +2591,7 @@ int annotate_get_insn_location(const struct arch *arch, struct disasm_line *dl,
 		} else {
 			char *s, *p = NULL;
 
-			if (arch__is(arch, "x86")) {
+			if (arch__is_x86(arch)) {
 				/* FIXME: Handle other segment registers */
 				if (!strncmp(insn_str, "%gs:", 4)) {
 					op_loc->segment = INSN_SEG_X86_GS;
@@ -2675,7 +2675,7 @@ static struct annotated_item_stat *annotate_data_stat(struct list_head *head,
 
 static bool is_stack_operation(const struct arch *arch, struct disasm_line *dl)
 {
-	if (arch__is(arch, "x86")) {
+	if (arch__is_x86(arch)) {
 		if (!strncmp(dl->ins.name, "push", 4) ||
 		    !strncmp(dl->ins.name, "pop", 3) ||
 		    !strncmp(dl->ins.name, "call", 4) ||
@@ -2689,7 +2689,7 @@ static bool is_stack_operation(const struct arch *arch, struct disasm_line *dl)
 static bool is_stack_canary(const struct arch *arch, struct annotated_op_loc *loc)
 {
 	/* On x86_64, %gs:40 is used for stack canary */
-	if (arch__is(arch, "x86")) {
+	if (arch__is_x86(arch)) {
 		if (loc->segment == INSN_SEG_X86_GS && loc->imm &&
 		    loc->offset == 40)
 			return true;
@@ -2704,7 +2704,7 @@ static bool is_stack_canary(const struct arch *arch, struct annotated_op_loc *lo
  */
 static bool is_address_gen_insn(const struct arch *arch, struct disasm_line *dl)
 {
-	if (arch__is(arch, "x86")) {
+	if (arch__is_x86(arch)) {
 		if (!strncmp(dl->ins.name, "lea", 3))
 			return true;
 	}
@@ -2847,7 +2847,7 @@ __hist_entry__get_data_type(struct hist_entry *he, const struct arch *arch,
 		}
 
 		/* This CPU access in kernel - pretend PC-relative addressing */
-		if (dso__kernel(map__dso(ms->map)) && arch__is(arch, "x86") &&
+		if (dso__kernel(map__dso(ms->map)) && arch__is_x86(arch) &&
 		    op_loc->segment == INSN_SEG_X86_GS && op_loc->imm) {
 			dloc.var_addr = op_loc->offset;
 			op_loc->reg1 = DWARF_REG_PC;
diff --git a/tools/perf/util/capstone.c b/tools/perf/util/capstone.c
index 2c7feab61b7b..ce06cfd253ef 100644
--- a/tools/perf/util/capstone.c
+++ b/tools/perf/util/capstone.c
@@ -147,7 +147,7 @@ static void print_capstone_detail(cs_insn *insn, char *buf, size_t len,
 	struct symbol *sym;
 
 	/* TODO: support more architectures */
-	if (!arch__is(args->arch, "x86"))
+	if (!arch__is_x86(args->arch))
 		return;
 
 	if (insn->detail == NULL)
diff --git a/tools/perf/util/disasm.c b/tools/perf/util/disasm.c
index 2793697ce75c..b7523256c4ad 100644
--- a/tools/perf/util/disasm.c
+++ b/tools/perf/util/disasm.c
@@ -228,9 +228,14 @@ const struct arch *arch__find(const char *name)
 	return bsearch(name, architectures, nmemb, sizeof(struct arch), arch__key_cmp);
 }
 
-bool arch__is(const struct arch *arch, const char *name)
+bool arch__is_x86(const struct arch *arch)
 {
-	return !strcmp(arch->name, name);
+	return arch->e_machine == EM_386 || arch->e_machine == EM_X86_64;
+}
+
+bool arch__is_powerpc(const struct arch *arch)
+{
+	return arch->e_machine == EM_PPC || arch->e_machine == EM_PPC64;
 }
 
 static void ins_ops__delete(struct ins_operands *ops)
@@ -877,7 +882,7 @@ static const struct ins_ops *__ins__find(const struct arch *arch, const char *na
 	struct ins *ins;
 	const int nmemb = arch->nr_instructions;
 
-	if (arch__is(arch, "powerpc")) {
+	if (arch__is_powerpc(arch)) {
 		/*
 		 * For powerpc, identify the instruction ops
 		 * from the opcode using raw_insn.
@@ -1066,7 +1071,7 @@ struct disasm_line *disasm_line__new(struct annotate_args *args)
 		goto out_delete;
 
 	if (args->offset != -1) {
-		if (arch__is(args->arch, "powerpc")) {
+		if (arch__is_powerpc(args->arch)) {
 			if (disasm_line__parse_powerpc(dl, args) < 0)
 				goto out_free_line;
 		} else if (disasm_line__parse(dl->al.line, &dl->ins.name, &dl->ops.raw) < 0)
@@ -1700,7 +1705,7 @@ int symbol__disassemble(struct symbol *sym, struct annotate_args *args)
 	 * and typeoff, disassemble to mnemonic notation is not required in
 	 * case of powerpc.
 	 */
-	if (arch__is(args->arch, "powerpc")) {
+	if (arch__is_powerpc(args->arch)) {
 		extern const char *sort_order;
 
 		if (sort_order && !strstr(sort_order, "sym")) {
diff --git a/tools/perf/util/disasm.h b/tools/perf/util/disasm.h
index 4f5c9a985786..db7f1ee3d8e7 100644
--- a/tools/perf/util/disasm.h
+++ b/tools/perf/util/disasm.h
@@ -106,7 +106,8 @@ struct annotate_args {
 };
 
 const struct arch *arch__find(const char *name);
-bool arch__is(const struct arch *arch, const char *name);
+bool arch__is_x86(const struct arch *arch);
+bool arch__is_powerpc(const struct arch *arch);
 
 const struct ins_ops *ins__find(const struct arch *arch, const char *name, struct disasm_line *dl);
 
diff --git a/tools/perf/util/llvm.c b/tools/perf/util/llvm.c
index 4ada9a10bd93..0d126d233c01 100644
--- a/tools/perf/util/llvm.c
+++ b/tools/perf/util/llvm.c
@@ -146,7 +146,7 @@ int symbol__disassemble_llvm(const char *filename, struct symbol *sym,
 		return errno;
 
 	init_llvm();
-	if (arch__is(args->arch, "x86")) {
+	if (arch__is_x86(args->arch)) {
 		const char *triplet = is_64bit ? "x86_64-pc-linux" : "i686-pc-linux";
 
 		disasm = LLVMCreateDisasm(triplet, &storage, /*tag_type=*/0,