From d190d906de5e612385126e5175123692c9196e60 Mon Sep 17 00:00:00 2001
From: Roman Zeyde <me@romanzey.de>
Date: Sat, 25 May 2019 12:42:13 +0300
Subject: [PATCH] core/secp256k1-zkp: use ARM assembly for field operations
 (#176)

Update to latest secp256k1-zkp to allow building on Cortex-M4 devices (https://github.com/ElementsProject/secp256k1-zkp/pull/56).
---
 core/SConscript.firmware | 2 ++
 vendor/secp256k1-zkp     | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/core/SConscript.firmware b/core/SConscript.firmware
index a46436be7..d40479654 100644
--- a/core/SConscript.firmware
+++ b/core/SConscript.firmware
@@ -100,6 +100,7 @@ CPPDEFINES_MOD += [
     'USE_NUM_NONE',
     'USE_FIELD_INV_BUILTIN',
     'USE_SCALAR_INV_BUILTIN',
+    'USE_EXTERNAL_ASM',
     'USE_FIELD_10X26',
     'USE_SCALAR_8X32',
     'USE_ECMULT_STATIC_PRECOMPUTATION',
@@ -112,6 +113,7 @@ CPPDEFINES_MOD += [
 ]
 SOURCE_MOD_SECP256K1_ZKP += [
     'vendor/secp256k1-zkp/src/secp256k1.c',
+    'vendor/secp256k1-zkp/src/asm/field_10x26_arm.s'
 ]
 
 # modtrezorio
diff --git a/vendor/secp256k1-zkp b/vendor/secp256k1-zkp
index 1c830b4c9..9ecd8bf38 160000
--- a/vendor/secp256k1-zkp
+++ b/vendor/secp256k1-zkp
@@ -1 +1 @@
-Subproject commit 1c830b4c9ac30aa32e246ea3ab8ef9ef99acf664
+Subproject commit 9ecd8bf38a77a97b44e8c830b286c65051f2f707