exo2: implement warmboot firmware

2025-05-20 09:55:07 -04:00 · 2020-06-11 01:30:30 -07:00 · 2020-06-11 01:30:30 -07:00 · 293c213bf2
commit 293c213bf2
parent ff87ff2592
43 changed files with 1996 additions and 103 deletions
--- a/libraries/libvapours/source/crypto/crypto_memory_compare.arch.arm.cpp
+++ b/libraries/libvapours/source/crypto/crypto_memory_compare.arch.arm.cpp
@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <vapours.hpp>
+
+namespace ams::crypto {
+
+    bool IsSameBytes(const void *lhs, const void *rhs, size_t size) {
+        bool result;
+        u8 xor_acc, ltmp, rtmp;
+        size_t index;
+
+        __asm__ __volatile__(
+            /* Clear registers and prepare for comparison. */
+            "   movs     %[xor_acc], #0\n"
+            "   movs     %[index], #0\n"
+            "   b       1f\n"
+
+            /* Compare one byte in constant time. */
+            "0:\n"
+            "   ldrb    %[ltmp], [%[lhs]]\n"
+            "   ldrb    %[rtmp], [%[rhs]]\n"
+            "   adds    %[lhs], #1\n"
+            "   adds    %[rhs], #1\n"
+            "   eors    %[ltmp], %[ltmp], %[rtmp]\n"
+            "   orrs    %[xor_acc], %[xor_acc], %[ltmp]\n"
+            "   adds    %[index], #1\n"
+
+            /* Check if there is still data to compare. */
+            "1:\n"
+            "   cmp     %[index], %[size]\n"
+            "   bcc     0b\n"
+
+            /* We're done, set result. */
+            "   cmp     %[xor_acc], #0\n"
+            "   moveq   %[result],  #1\n"
+            "   movne   %[result],  #0\n"
+            : [result]"=r"(result), [lhs]"+r"(lhs), [rhs]"+r"(rhs), [xor_acc]"=&r"(xor_acc), [index]"=&r"(index), [ltmp]"=&r"(ltmp), [rtmp]"=&r"(rtmp)
+            : [size]"r"(size)
+            : "cc"
+        );
+
+        return result;
+    }
+
+}