Add support for semihosting with GCC. Still needs more testing.

[mirror_edk2.git] / ArmPkg / Library / SemihostLib / Arm / GccSemihost.S

diff --git a/ArmPkg/Library/SemihostLib/Arm/GccSemihost.S b/ArmPkg/Library/SemihostLib/Arm/GccSemihost.S
new file mode 100755 (executable)
index 0000000..aa8b16a
--- /dev/null
+++ b/ArmPkg/Library/SemihostLib/Arm/GccSemihost.S
@@ -0,0 +1,35 @@
+#------------------------------------------------------------------------------ 
+#
+# Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
+#
+# This program and the accompanying materials
+# are licensed and made available under the terms and conditions of the BSD License
+# which accompanies this distribution.  The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+#------------------------------------------------------------------------------
+
+.text
+.align 2
+
+.globl ASM_PFX(GccSemihostCall)
+INTERWORK_FUNC(GccSemihostCall)
+
+/*
+  Semihosting operation request mechanism
+  
+  SVC  0x123456  in ARM state (for all architectures)
+  SVC  0xAB in Thumb state (excluding ARMv7-M)
+  BKPT 0xAB for ARMv7-M (Thumb-2 only)
+  
+  R0 - operation type 
+  R1 - block containing all other parametes 
+ */
+ASM_PFX(GccSemihostCall):
+  svc     #0x123456  
+  bx      lr
+
+