Extend handling of immediates on ARM's SystemTap SDT probe support

Continuing my series of fixes on the SystemTap SDT support for the
ARM/AArch64 architectures, this patch now extends how ARM's SDT specific
parser handles literal numbers (immediates).

Currently, it only accepts "#" as the prefix.  However, according to
"info '(as) ARM-Chars'", expressions can also have "$" and nothing as a
prefix.  This patch extends the parser to accept those options.

2013-12-28  Sergio Durigan Junior  <sergiodj@redhat.com>

	* arm-linux-tdep.c (arm_stap_is_single_operand): Accept "$" as a
	literal prefix.  Also accept no prefix at all.
	(arm_stap_parse_special_token): Likewise.
	(arm_linux_init_abi): Likewise.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index c6f37e5..02db708 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,12 @@
 2013-12-28  Sergio Durigan Junior  <sergiodj@redhat.com>
 
+       * arm-linux-tdep.c (arm_stap_is_single_operand): Accept "$" as a
+       literal prefix.  Also accept no prefix at all.
+       (arm_stap_parse_special_token): Likewise.
+       (arm_linux_init_abi): Likewise.
+
+2013-12-28  Sergio Durigan Junior  <sergiodj@redhat.com>
+
        PR tdep/15653
        * NEWS: Mention SystemTap SDT probe support for AArch64 GNU/Linux.
        * aarch64-linux-tdep.c: Include necessary headers for parsing of

diff --git a/gdb/arm-linux-tdep.c b/gdb/arm-linux-tdep.c
index 0284f69..830b2eb 100644 (file)
--- a/gdb/arm-linux-tdep.c
+++ b/gdb/arm-linux-tdep.c
@@ -1116,7 +1116,7 @@ arm_linux_displaced_step_copy_insn (struct gdbarch *gdbarch,
 static int
 arm_stap_is_single_operand (struct gdbarch *gdbarch, const char *s)
 {
-  return (*s == '#' /* Literal number.  */
+  return (*s == '#' || *s == '$' || isdigit (*s) /* Literal number.  */
          || *s == '[' /* Register indirection or
                          displacement.  */
          || isalpha (*s)); /* Register value.  */
@@ -1183,8 +1183,8 @@ arm_stap_parse_special_token (struct gdbarch *gdbarch,
 
       ++tmp;
       tmp = skip_spaces_const (tmp);
-      if (*tmp++ != '#')
-       return 0;
+      if (*tmp == '#' || *tmp == '$')
+       ++tmp;
 
       if (*tmp == '-')
        {
@@ -1235,7 +1235,7 @@ static void
 arm_linux_init_abi (struct gdbarch_info info,
                    struct gdbarch *gdbarch)
 {
-  static const char *const stap_integer_prefixes[] = { "#", NULL };
+  static const char *const stap_integer_prefixes[] = { "#", "$", "", NULL };
   static const char *const stap_register_prefixes[] = { "r", NULL };
   static const char *const stap_register_indirection_prefixes[] = { "[",
                                                                    NULL };