[binutils-gdb/oracle/bpf] Add note ate the frame pointer fp being read-only

[Jose E.Marchesi]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=07e14f04d081c4ac6b895d85df1bd8c9b6758a24

commit 07e14f04d081c4ac6b895d85df1bd8c9b6758a24
Author: Jose E. Marchesi <jose.marchesi@oracle.com>
Date:   Mon Apr 22 13:05:03 2019 +0200

    Add note ate the frame pointer fp being read-only

Diff:
---
 cpu/bpf.cpu | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/cpu/bpf.cpu b/cpu/bpf.cpu
index 5533a09..05ef2e7 100644
--- a/cpu/bpf.cpu
+++ b/cpu/bpf.cpu
@@ -114,6 +114,8 @@
                        ;; there can be conflicts with symbols, which
                        ;; would require to reorder the insns and also
                        ;; could lead to confusing situations.
+                       ;; XXX the frame pointer fp is read-only, so it should
+                       ;; go in a different hardware.
            (;; ABI names.  Take priority when disassembling.
             (a 0) (r1 1) (r2 2) (r3 3) (r4 4) (r5 5) (r6 6)
             (r7 7) (r8 8) (r9 9) (fp 10)