gdb/aarch64: record/replay support for RPRFM, PRFM (reg), PRFUM

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

No testcase has been added as these are hint instructions which don't
modify registers/memory.

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.

Approved-By: Luis Machado <luis.machado.foss@gmail.com>

diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c
index 4befaa2720d10325c4885381fa81a0caa46af571..a5e586a735cf062f615882af9444e9f991812c70 100644 (file)
--- a/gdb/aarch64-tdep.c
+++ b/gdb/aarch64-tdep.c
@@ -5827,6 +5827,11 @@ 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;
 
@@ -5857,7 +5862,7 @@ aarch64_record_load_store (aarch64_insn_decode_record *aarch64_insn_r)
          aarch64_insn_r->reg_rec_count = 1;
        }
     }
-  /* Load/store register (immediate and unprivileged) instructions.  */
+  /* Load/store register (immediate and unprivileged) instructions and PRFUM.  */
   else if ((insn_bits24_27 & 0x0b) == 0x08 && insn_bits28_29 == 0x03
           && !insn_bit21)
     {
@@ -5876,7 +5881,11 @@ aarch64_record_load_store (aarch64_insn_decode_record *aarch64_insn_r)
        if (size_bits != 0x03)
          ld_flag = 0x01;
        else
-         return AARCH64_RECORD_UNKNOWN;
+         if (insn_bits10_11 == 0)
+           /* PRFUM instruction.  */
+           return AARCH64_RECORD_SUCCESS;
+      else
+       return AARCH64_RECORD_UNKNOWN;
 
       if (!ld_flag)
        {