From ef37962496683da0e9309dfd0efa6fa67ece8ef0 Mon Sep 17 00:00:00 2001
From: Ruslan Bukin <br@FreeBSD.org>
Date: Thu, 10 Nov 2016 12:54:33 +0000
Subject: [PATCH] Implement riscv jumpto() so world can be compiled.

Sponsored by:	DARPA, AFRL
Sponsored by:	HEIF5
---
 .../libunwind/src/UnwindRegistersRestore.S    | 46 ++++++++++++++++++-
 1 file changed, 45 insertions(+), 1 deletion(-)

diff --git a/contrib/llvm/projects/libunwind/src/UnwindRegistersRestore.S b/contrib/llvm/projects/libunwind/src/UnwindRegistersRestore.S
index 534d79592240..8e37c13036f6 100644
--- a/contrib/llvm/projects/libunwind/src/UnwindRegistersRestore.S
+++ b/contrib/llvm/projects/libunwind/src/UnwindRegistersRestore.S
@@ -480,6 +480,50 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind14Registers_or1k6jumptoEv)
 
 #elif defined(__riscv__)
 
-/* RISCVTODO */
+//
+// void libunwind::Registers_riscv::jumpto()
+//
+// On entry:
+//  thread_state pointer is in a0
+//
+  .p2align 2
+DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind15Registers_riscv6jumptoEv)
+  // x0 is zero
+  ld    x1, (8 * 1)(a0)
+  ld    x2, (8 * 2)(a0)
+  ld    x3, (8 * 3)(a0)
+  ld    x4, (8 * 4)(a0)
+  ld    x5, (8 * 5)(a0)
+  ld    x6, (8 * 6)(a0)
+  ld    x7, (8 * 7)(a0)
+  ld    x8, (8 * 8)(a0)
+  ld    x9, (8 * 9)(a0)
+  // skip a0 for now
+  ld    x11, (8 * 11)(a0)
+  ld    x12, (8 * 12)(a0)
+  ld    x13, (8 * 13)(a0)
+  ld    x14, (8 * 14)(a0)
+  ld    x15, (8 * 15)(a0)
+  ld    x16, (8 * 16)(a0)
+  ld    x17, (8 * 17)(a0)
+  ld    x18, (8 * 18)(a0)
+  ld    x19, (8 * 19)(a0)
+  ld    x20, (8 * 20)(a0)
+  ld    x21, (8 * 21)(a0)
+  ld    x22, (8 * 22)(a0)
+  ld    x23, (8 * 23)(a0)
+  ld    x24, (8 * 24)(a0)
+  ld    x25, (8 * 25)(a0)
+  ld    x26, (8 * 26)(a0)
+  ld    x27, (8 * 27)(a0)
+  ld    x28, (8 * 28)(a0)
+  ld    x29, (8 * 29)(a0)
+  ld    x30, (8 * 30)(a0)
+  ld    x31, (8 * 31)(a0)
+  ld    x10, (8 * 10)(a0)   // restore a0
+
+  /* RISCVTODO: restore FPU registers */
+
+  ret                       // jump to ra
 
 #endif