1 files changed, 98 insertions, 0 deletions
diff --git a/src/securerom/branchtable.S b/src/securerom/branchtable.S
new file mode 100644
index 000000000..d3c1c8608
--- /dev/null
+++ b/src/securerom/branchtable.S
@@ -0,0 +1,98 @@
+# IBM_PROLOG_BEGIN_TAG
+# This is an automatically generated prolog.
+#
+# $Source: src/securerom/branchtable.S $
+#
+# OpenPOWER HostBoot Project
+#
+# Contributors Listed Below - COPYRIGHT 2016,2017
+# [+] International Business Machines Corp.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied. See the License for the specific language governing
+# permissions and limitations under the License.
+#
+# IBM_PROLOG_END_TAG
+#****************************************************************************
+#*  branch table - a more stable location for software entering rom code
+#****************************************************************************
+#  adr function
+#	0 instruction_start
+#	2 .SHA512_Init
+#	4 .SHA512_Update
+#	6 .SHA512_Final
+#	8 .SHA512_Hash
+#	A .ec_verify
+#	C .ROM_verify
+#	100 rom_sreset
+
+branchtable:
+	.section	".branchtable","ax"
+
+	.globl _instruction_start
+_instruction_start:
+	b	instruction_start
+	nop
+
+	.globl	_SHA512_Init
+_SHA512_Init:
+	li	r0,	.L.SHA512_Init@l
+	b	springboard
+
+	.globl	_SHA512_Update
+_SHA512_Update:
+	li	r0,	.L.SHA512_Update@l
+	b	springboard
+
+	.globl	_SHA512_Final
+_SHA512_Final:
+	li	r0,	.L.SHA512_Final@l
+	b	springboard
+
+	.globl	_SHA512_Hash
+_SHA512_Hash:
+	li	r0,	.L.SHA512_Hash@l
+	b	springboard
+
+	.globl	_ec_verify
+_ec_verify:
+	li	r0,	.L.ec_verify@l
+	b	springboard
+
+	.globl	_ROM_verify
+_ROM_verify:
+	li	r0,	.L.ROM_verify@l
+	b	springboard
+
+#define CFAR 28
+
+springboard:
+	b		boingboing
+boingboing:
+	mfspr   r2, CFAR             // get address of springboard
+	addi	r2, r2, _instruction_start-springboard  // base address
+	add		r0,	r0, r2           // calculate entry relative
+	addi	r2, r2,              0x4000    //TOC+0x8000  part 1
+	addi	r2, r2, (__toc_start+0x4000)@l //TOC+0x8000  part 2
+	mtctr	r0
+	bctr						// jump
+
+# could put other assembly ocde routines here to conserver ROM space
+# including the sreset routine
+
+# need to align on bootrombase+0x100 !!!
+	.org    .branchtable+0x100
+	.globl	_rom_sreset
+_rom_sreset:
+	li	r0,	rom_sreset@l
+	b	springboard
+	nop