From ae7e2f45aa4798be449f282bbf75ad41e73f055e Mon Sep 17 00:00:00 2001
From: Christophe Lyon <christophe.lyon@arm.com>
Date: Fri, 1 Apr 2022 10:22:16 +0100
Subject: gdb/arm: Add support for multiple stack pointers on Cortex-M
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Armv8-M architecture with Security extension features four stack pointers
to handle Secure and Non-secure modes.

This patch adds support to switch between them as needed during
unwinding, and replaces all updates of cache->prev_sp with calls to
arm_cache_set_prev_sp.

Signed-off-by: Torbjörn Svensson <torbjorn.svensson@st.com>
Signed-off-by: Christophe Lyon <christophe.lyon@foss.st.com>
Signed-off-by: Christophe Lyon <christophe.lyon@arm.com>
---
 gdb/features/arm/arm-secext.c   | 17 +++++++++++++++++
 gdb/features/arm/arm-secext.xml | 15 +++++++++++++++
 2 files changed, 32 insertions(+)
 create mode 100644 gdb/features/arm/arm-secext.c
 create mode 100644 gdb/features/arm/arm-secext.xml

(limited to 'gdb/features')

diff --git a/gdb/features/arm/arm-secext.c b/gdb/features/arm/arm-secext.c
new file mode 100644
index 0000000..39ef4af
--- /dev/null
+++ b/gdb/features/arm/arm-secext.c
@@ -0,0 +1,17 @@
+/* THIS FILE IS GENERATED.  -*- buffer-read-only: t -*- vi:set ro:
+  Original: arm-secext.xml */
+
+#include "gdbsupport/tdesc.h"
+
+static int
+create_feature_arm_arm_m_system (struct target_desc *result, long regnum)
+{
+  struct tdesc_feature *feature;
+
+  feature = tdesc_create_feature (result, "org.gnu.gdb.arm.secext");
+  tdesc_create_reg (feature, "msp_ns", regnum++, 1, NULL, 32, "data_ptr");
+  tdesc_create_reg (feature, "psp_ns", regnum++, 1, NULL, 32, "data_ptr");
+  tdesc_create_reg (feature, "msp_s", regnum++, 1, NULL, 32, "data_ptr");
+  tdesc_create_reg (feature, "psp_s", regnum++, 1, NULL, 32, "data_ptr");
+  return regnum;
+}
diff --git a/gdb/features/arm/arm-secext.xml b/gdb/features/arm/arm-secext.xml
new file mode 100644
index 0000000..52b2c20
--- /dev/null
+++ b/gdb/features/arm/arm-secext.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0"?>
+<!-- Copyright (C) 2022 Free Software Foundation, Inc.
+
+     Copying and distribution of this file, with or without modification,
+     are permitted in any medium without royalty provided the copyright
+     notice and this notice are preserved.  -->
+
+<!DOCTYPE feature SYSTEM "gdb-target.dtd">
+<feature name="org.gnu.gdb.arm.secext">
+  <!-- We have 4 stack pointers with the security extension.  -->
+  <reg name="msp_ns" bitsize="32" type="data_ptr"/>
+  <reg name="psp_ns" bitsize="32" type="data_ptr"/>
+  <reg name="msp_s" bitsize="32" type="data_ptr"/>
+  <reg name="psp_s" bitsize="32" type="data_ptr"/>
+</feature>
-- 
cgit v1.1