[PATCH v2 16/31] perf dwarf-regs: Pass accurate disassembly machine to get_dwarf_regnum

[Ian Rogers]

Rather than pass 0/EM_NONE, use the value computed in the disasm
struct arch. Switch the EM_NONE case to EM_HOST, rewriting EM_NONE if
it were passed to get_dwarf_regnum. Pass a flags value as
architectures like csky need the flags to determine the ABI variant.

Signed-off-by: Ian Rogers <irogers at google.com>
---
 tools/perf/util/annotate.c           | 6 +++---
 tools/perf/util/dwarf-regs.c         | 8 ++++++--
 tools/perf/util/include/dwarf-regs.h | 5 +++--
 3 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 37ce43c4eb8f..b1d98da79be8 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -2292,7 +2292,7 @@ static int extract_reg_offset(struct arch *arch, const char *str,
 	if (regname == NULL)
 		return -1;
 
-	op_loc->reg1 = get_dwarf_regnum(regname, 0);
+	op_loc->reg1 = get_dwarf_regnum(regname, arch->e_machine, arch->e_flags);
 	free(regname);
 
 	/* Get the second register */
@@ -2305,7 +2305,7 @@ static int extract_reg_offset(struct arch *arch, const char *str,
 		if (regname == NULL)
 			return -1;
 
-		op_loc->reg2 = get_dwarf_regnum(regname, 0);
+		op_loc->reg2 = get_dwarf_regnum(regname, arch->e_machine, arch->e_flags);
 		free(regname);
 	}
 	return 0;
@@ -2405,7 +2405,7 @@ int annotate_get_insn_location(struct arch *arch, struct disasm_line *dl,
 				return -1;
 
 			if (*s == arch->objdump.register_char)
-				op_loc->reg1 = get_dwarf_regnum(s, 0);
+				op_loc->reg1 = get_dwarf_regnum(s, arch->e_machine, arch->e_flags);
 			else if (*s == arch->objdump.imm_char) {
 				op_loc->offset = strtol(s + 1, &p, 0);
 				if (p && p != s + 1)
diff --git a/tools/perf/util/dwarf-regs.c b/tools/perf/util/dwarf-regs.c
index 7c01bc4d7e5b..1321387f6948 100644
--- a/tools/perf/util/dwarf-regs.c
+++ b/tools/perf/util/dwarf-regs.c
@@ -70,7 +70,7 @@ __weak int get_arch_regnum(const char *name __maybe_unused)
 }
 
 /* Return DWARF register number from architecture register name */
-int get_dwarf_regnum(const char *name, unsigned int machine)
+int get_dwarf_regnum(const char *name, unsigned int machine, unsigned int flags __maybe_unused)
 {
 	char *regname = strdup(name);
 	int reg = -1;
@@ -84,8 +84,12 @@ int get_dwarf_regnum(const char *name, unsigned int machine)
 	if (p)
 		*p = '\0';
 
+	if (machine == EM_NONE) {
+		/* Generic arch - use host arch */
+		machine = EM_HOST;
+	}
 	switch (machine) {
-	case EM_NONE:	/* Generic arch - use host arch */
+	case EM_HOST:
 		reg = get_arch_regnum(regname);
 		break;
 	default:
diff --git a/tools/perf/util/include/dwarf-regs.h b/tools/perf/util/include/dwarf-regs.h
index f4f87ded5e3d..ee0a734564c7 100644
--- a/tools/perf/util/include/dwarf-regs.h
+++ b/tools/perf/util/include/dwarf-regs.h
@@ -93,12 +93,13 @@ int get_arch_regnum(const char *name);
  * name: architecture register name
  * machine: ELF machine signature (EM_*)
  */
-int get_dwarf_regnum(const char *name, unsigned int machine);
+int get_dwarf_regnum(const char *name, unsigned int machine, unsigned int flags);
 
 #else /* HAVE_LIBDW_SUPPORT */
 
 static inline int get_dwarf_regnum(const char *name __maybe_unused,
-				   unsigned int machine __maybe_unused)
+				   unsigned int machine __maybe_unused,
+				   unsigned int flags __maybe_unused)
 {
 	return -1;
 }
-- 
2.47.0.rc0.187.ge670bccf7e-goog