From: Luis Machado <luis.machado@arm.com>
Date: Thu, 8 Oct 2020 17:06:35 +0000 (-0300)
Subject: [Morello] Add 'C' augmentation character support
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b34767fcc8909619e080c7879631df62138efccf;p=thirdparty%2Fbinutils-gdb.git

[Morello] Add 'C' augmentation character support

Handle the Morello 'C' augmentation character. It is not used yet, but it
is acknowledged.

gdb/ChangeLog:

2020-10-20  Luis Machado  <luis.machado@arm.com>

	* dwarf2/frame.c (struct dwarf2_cie) <pure_cap>: New field.
	(decode_frame_entry_1): Handle the 'C' augmentation character.
---

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index a85c361f820..f15af2c4552 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2020-10-20  Luis Machado  <luis.machado@arm.com>
+
+	* dwarf2/frame.c (struct dwarf2_cie) <pure_cap>: New field.
+	(decode_frame_entry_1): Handle the 'C' augmentation character.
+
 2020-10-20  Luis Machado  <luis.machado@arm.com>
 
 	* aarch64-tdep.c (aarch64_register_has_tag, aarch64_register_tag): New
diff --git a/gdb/dwarf2/frame.c b/gdb/dwarf2/frame.c
index a8748e4d7d3..0b2b8eeb9be 100644
--- a/gdb/dwarf2/frame.c
+++ b/gdb/dwarf2/frame.c
@@ -96,6 +96,9 @@ struct dwarf2_cie
   /* True if an 'S' augmentation existed.  */
   unsigned char signal_frame;
 
+  /* True if a 'C' augmentation was specified.  */
+  unsigned char pure_cap;
+
   /* The version recorded in the CIE.  */
   unsigned char version;
 
@@ -1943,6 +1946,15 @@ decode_frame_entry_1 (struct gdbarch *gdbarch,
 	      augmentation++;
 	    }
 
+	  /* "C" indicates that the default unwind rules for this CIE should be
+	     initialized in accordance with the pure capability procedure call
+	     standard.  */
+	  else if (*augmentation == 'C')
+	    {
+	      cie->pure_cap = 1;
+	      augmentation++;
+	    }
+
 	  /* Otherwise we have an unknown augmentation.  Assume that either
 	     there is no augmentation data, or we saw a 'z' prefix.  */
 	  else