[PATCH 3/4] gdb/aarch64: record/replay support for RPRFM and PRFM (reg)

[<Ezra.Sitorus@arm.com>]

From: Ezra Sitorus <ezra.sitorus@arm.com>

The PRFM (register) instruction variant was unsupported. This is added
along with RPRFM.

No testcase has been added as these are hint instructions which don't
modify registers/memory. I'm happy to add them in if you think these are
required.

The full testsuite was done on aarch64-none-linux-gnu without RPRFM.
The gdb.arch and gdb.reverse tests were run on Shrinkwrap with RPRFM
support. I've observed unrelated regressions that appear to be due to
Shrinkwrap rather than my patch.
---
 gdb/aarch64-tdep.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c
index 81d4f160f8f..61c462979b3 100644
--- a/gdb/aarch64-tdep.c
+++ b/gdb/aarch64-tdep.c
@@ -5914,6 +5914,11 @@ aarch64_record_load_store (aarch64_insn_decode_record *aarch64_insn_r)
       else
 	if (size_bits != 0x03)
 	  ld_flag = 0x01;
+	else if (size_bits == 0x3 && vector_flag == 0x0 && opc == 0x2)
+	  {
+	    /* PRFM (register) or RPRFM */
+	    return AARCH64_RECORD_SUCCESS;
+	  }
 	else
 	  return AARCH64_RECORD_UNKNOWN;
 
-- 
2.43.0