commit e7d3222e2e07e2a1a0aac979ef1fa5e8ef59f02c
author Alexander Bulekov <alxndr@bu.edu> Fri Oct 23 11:07:34 2020 -0400
committer Thomas Huth <thuth@redhat.com> Mon Oct 26 09:53:53 2020 +0100
tree 6a7bcc1a5835fd09fec53a5de1b14c4638e54eb7
parent 20f5a3029386363357e6fa0c2e82b35ac4914d6a

fuzz: Declare DMA Read callback function

This patch declares the fuzz_dma_read_cb function and uses the
preprocessor and linker(weak symbols) to handle these cases:

When we build softmmu/all with --enable-fuzzing, there should be no
strong symbol defined for fuzz_dma_read_cb, and we link against a weak
stub function.

When we build softmmu/fuzz with --enable-fuzzing, we link against the
strong symbol in generic_fuzz.c

When we build softmmu/all without --enable-fuzzing, fuzz_dma_read_cb is
an empty, inlined function. As long as we don't call any other functions
when building the arguments, there should be no overhead.

Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Message-Id: <20201023150746.107063-6-alxndr@bu.edu>
Signed-off-by: Thomas Huth <thuth@redhat.com>

include/exec/memory.h

diff --git a/include/exec/memory.h b/include/exec/memory.h
index 93d27bf..4aaf578 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -47,6 +47,14 @@
                       size_t len,
                       MemoryRegion *mr,
                       bool is_write);
+#else
+static inline void fuzz_dma_read_cb(size_t addr,
+                                    size_t len,
+                                    MemoryRegion *mr,
+                                    bool is_write)
+{
+    /* Do Nothing */
+}
 #endif
 
 extern bool global_dirty_log;