From 6eee26d55f32113e3ea4575e5500f2fc3c312fff Mon Sep 17 00:00:00 2001
From: Sverker Eriksson <sverker@erlang.org>
Date: Tue, 4 Oct 2016 21:46:53 +0200
Subject: erts: Enable exec_alloc for all hipe architectures

For non-amd64 it's a "normal" allocator with a
wrapper around mseg_alloc to call mprotect(PROT_EXEC).
---
 erts/emulator/beam/erl_alloc_util.c | 48 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 47 insertions(+), 1 deletion(-)

(limited to 'erts/emulator/beam/erl_alloc_util.c')

diff --git a/erts/emulator/beam/erl_alloc_util.c b/erts/emulator/beam/erl_alloc_util.c
index 2995f2f822..77be48035d 100644
--- a/erts/emulator/beam/erl_alloc_util.c
+++ b/erts/emulator/beam/erl_alloc_util.c
@@ -907,7 +907,9 @@ erts_alcu_literal_32_mseg_dealloc(Allctr_t *allctr, void *seg, Uint size,
 
 #elif defined(ARCH_64) && defined(ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION)
 
-/* Used by literal allocator that has its own mmapper (super carrier) */
+/* For allocators that have their own mmapper (super carrier),
+ * like literal_alloc and exec_alloc on amd64
+ */
 void*
 erts_alcu_mmapper_mseg_alloc(Allctr_t *allctr, Uint *size_p, Uint flags)
 {
@@ -948,6 +950,50 @@ erts_alcu_mmapper_mseg_dealloc(Allctr_t *allctr, void *seg, Uint size,
 }
 #endif /* ARCH_64 && ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION */
 
+#if defined(ERTS_ALC_A_EXEC) && !defined(ERTS_HAVE_EXEC_MMAPPER)
+
+/*
+ * For exec_alloc on non-amd64 that just need memory with PROT_EXEC
+ */
+void*
+erts_alcu_exec_mseg_alloc(Allctr_t *allctr, Uint *size_p, Uint flags)
+{
+    void* res = erts_alcu_mseg_alloc(allctr, size_p, flags);
+
+    if (res) {
+        int r = mprotect(res, *size_p, PROT_EXEC | PROT_READ | PROT_WRITE);
+        ASSERT(r == 0); (void)r;
+    }
+    return res;
+}
+
+void*
+erts_alcu_exec_mseg_realloc(Allctr_t *allctr, void *seg,
+                            Uint old_size, Uint *new_size_p)
+{
+    void *res;
+
+    if (seg && old_size) {
+        int r = mprotect(seg, old_size, PROT_READ | PROT_WRITE);
+        ASSERT(r == 0); (void)r;
+    }
+    res = erts_alcu_mseg_realloc(allctr, seg, old_size, new_size_p);
+    if (res) {
+        int r = mprotect(res, *new_size_p, PROT_EXEC | PROT_READ | PROT_WRITE);
+        ASSERT(r == 0); (void)r;
+    }
+    return res;
+}
+
+void
+erts_alcu_exec_mseg_dealloc(Allctr_t *allctr, void *seg, Uint size, Uint flags)
+{
+    int r = mprotect(seg, size, PROT_READ | PROT_WRITE);
+    ASSERT(r == 0); (void)r;
+    erts_alcu_mseg_dealloc(allctr, seg, size, flags);
+}
+#endif /* ERTS_ALC_A_EXEC && !ERTS_HAVE_EXEC_MMAPPER */
+
 #endif /* HAVE_ERTS_MSEG */
 
 void*
-- 
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