perf dwarf-regs: Pass accurate disassembly machine to get_dwarf_regnum

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.

Reviewed-by: Masami Hiramatsu (Google) <[email protected]>
Signed-off-by: Ian Rogers <[email protected]>
Cc: Anup Patel <[email protected]>
Cc: Yang Jihong <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: Shenlin Liang <[email protected]>
Cc: Nick Terrell <[email protected]>
Cc: Guilherme Amadio <[email protected]>
Cc: Steinar H. Gunderson <[email protected]>
Cc: Changbin Du <[email protected]>
Cc: Alexander Lobakin <[email protected]>
Cc: Przemek Kitszel <[email protected]>
Cc: Huacai Chen <[email protected]>
Cc: Guo Ren <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: James Clark <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Chen Pei <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Oliver Upton <[email protected]>
Cc: Aditya Gupta <[email protected]>
Cc: Kajol Jain <[email protected]>
Cc: Athira Rajeev <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Bibo Mao <[email protected]>
Cc: John Garry <[email protected]>
Cc: Atish Patra <[email protected]>
Cc: Dima Kogan <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Dr. David Alan Gilbert <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

Author: captain5050

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)

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:

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

@@ -103,12 +103,13 @@ 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;
 }