From: Ezra Sitorus <ezra.sitorus@arm.com>
Date: Mon, 18 May 2026 12:34:38 +0000 (+0100)
Subject: gdb/aarch64: record/replay support for RPRFM, PRFM (reg), PRFUM
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f6c1ca239d932db39a6f19d9bd343f4f4fddba76;p=thirdparty%2Fbinutils-gdb.git

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 4befaa2720d..a5e586a735c 100644
--- 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)
 	{