[AArch64][libopcode] Add support for PAN architecture extension

The ARMv8.1 architecture introduced the Privileged Access Never extension. This
adds a processor state field PSTATE.PAN which can be accessed using the MRS/MSR
instructions.

This patch adds support for the PAN architecture feature and processor state
field to libopcode.

include/opcode
2015-06-01  Matthew Wahab  <matthew.wahab@arm.com>

	* aarch64.h (AARCH64_FEATURE_PAN): New.
	(aarch64_sys_reg_supported_p): Declare.
	(aarch64_pstatefield_supported_p): Declare.

opcodes/
2015-06-01  Matthew Wahab  <matthew.wahab@arm.com>
	* aarch64-opc.c (F_ARCHEXT): New.
	(aarch64_sys_regs): Add "pan".
	(aarch64_sys_reg_supported_p): New.
	(aarch64_pstatefields): Add "pan".
	(aarch64_pstatefield_supported_p): New.

diff --git a/include/opcode/ChangeLog b/include/opcode/ChangeLog
index b5702c5..5b8a1ff 100644 (file)
--- a/include/opcode/ChangeLog
+++ b/include/opcode/ChangeLog
@@ -1,3 +1,9 @@
+2015-06-01  Matthew Wahab  <matthew.wahab@arm.com>
+
+       * aarch64.h (AARCH64_FEATURE_PAN): New.
+       (aarch64_sys_reg_supported_p): Declare.
+       (aarch64_pstatefield_supported_p): Declare.
+
 2015-04-30  DJ Delorie  <dj@redhat.com>
 
        * rl78.h (RL78_Dis_Isa): New.

diff --git a/include/opcode/aarch64.h b/include/opcode/aarch64.h
index 7130d2d..8df82a1 100644 (file)
--- a/include/opcode/aarch64.h
+++ b/include/opcode/aarch64.h
@@ -39,6 +39,7 @@ typedef uint32_t aarch64_insn;
 #define AARCH64_FEATURE_SIMD   0x00040000      /* SIMD instructions.  */
 #define AARCH64_FEATURE_CRC    0x00080000      /* CRC instructions.  */
 #define AARCH64_FEATURE_LSE    0x00100000      /* LSE instructions.  */
+#define AARCH64_FEATURE_PAN    0x00200000      /* PAN instructions.  */
 
 /* Architectures are the sum of the base and extensions.  */
 #define AARCH64_ARCH_V8                AARCH64_FEATURE (AARCH64_FEATURE_V8, \
@@ -629,6 +630,10 @@ typedef struct
 extern const aarch64_sys_reg aarch64_sys_regs [];
 extern const aarch64_sys_reg aarch64_pstatefields [];
 extern bfd_boolean aarch64_sys_reg_deprecated_p (const aarch64_sys_reg *);
+extern bfd_boolean aarch64_sys_reg_supported_p (const aarch64_feature_set,
+                                               const aarch64_sys_reg *);
+extern bfd_boolean aarch64_pstatefield_supported_p (const aarch64_feature_set,
+                                                   const aarch64_sys_reg *);
 
 typedef struct
 {

diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index 9158b14..f4688c8 100644 (file)
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,3 +1,11 @@
+2015-06-01  Matthew Wahab  <matthew.wahab@arm.com>
+
+       * aarch64-opc.c (F_ARCHEXT): New.
+       (aarch64_sys_regs): Add "pan".
+       (aarch64_sys_reg_supported_p): New.
+       (aarch64_pstatefields): Add "pan".
+       (aarch64_pstatefield_supported_p): New.
+
 2015-06-01  Jan Beulich  <jbeulich@suse.com>
 
        * i386-tbl.h: Regenerate.

diff --git a/opcodes/aarch64-opc.c b/opcodes/aarch64-opc.c
index 5ea1384..5c7ef86 100644 (file)
--- a/opcodes/aarch64-opc.c
+++ b/opcodes/aarch64-opc.c
@@ -2723,6 +2723,12 @@ aarch64_print_operand (char *buf, size_t size, bfd_vma pc,
 #endif
 #define F_DEPRECATED   0x1     /* Deprecated system register.  */
 
+#ifdef F_ARCHEXT
+#undef F_ARCHEXT
+#endif
+#define F_ARCHEXT      0x2     /* Architecture dependent system register.  */
+
+
 /* TODO there are two more issues need to be resolved
    1. handle read-only and write-only system registers
    2. handle cpu-implementation-defined system registers.  */
@@ -2734,6 +2740,7 @@ const aarch64_sys_reg aarch64_sys_regs [] =
   { "spsel",            CPEN_(0,C2,0), 0 },
   { "daif",             CPEN_(3,C2,1), 0 },
   { "currentel",        CPEN_(0,C2,2), 0 }, /* RO */
+  { "pan",             CPEN_(0,C2,3),  F_ARCHEXT },
   { "nzcv",             CPEN_(3,C2,0), 0 },
   { "fpcr",             CPEN_(3,C4,0), 0 },
   { "fpsr",             CPEN_(3,C4,1), 0 },
@@ -3043,14 +3050,45 @@ aarch64_sys_reg_deprecated_p (const aarch64_sys_reg *reg)
   return (reg->flags & F_DEPRECATED) != 0;
 }
 
+bfd_boolean
+aarch64_sys_reg_supported_p (const aarch64_feature_set features,
+                            const aarch64_sys_reg *reg)
+{
+  if (!(reg->flags & F_ARCHEXT))
+    return TRUE;
+
+  /* PAN.  Values are from aarch64_sys_regs.  */
+  if (reg->value == CPEN_(0,C2,3)
+      && !AARCH64_CPU_HAS_FEATURE (features, AARCH64_FEATURE_PAN))
+    return FALSE;
+
+  return TRUE;
+}
+
 const aarch64_sys_reg aarch64_pstatefields [] =
 {
   { "spsel",            0x05,  0 },
   { "daifset",          0x1e,  0 },
   { "daifclr",          0x1f,  0 },
+  { "pan",             0x04,   F_ARCHEXT },
   { 0,          CPENC(0,0,0,0,0), 0 },
 };
 
+bfd_boolean
+aarch64_pstatefield_supported_p (const aarch64_feature_set features,
+                                const aarch64_sys_reg *reg)
+{
+  if (!(reg->flags & F_ARCHEXT))
+    return TRUE;
+
+  /* PAN.  Values are from aarch64_pstatefields.  */
+  if (reg->value == 0x04
+      && !AARCH64_CPU_HAS_FEATURE (features, AARCH64_FEATURE_PAN))
+    return FALSE;
+
+  return TRUE;
+}
+
 const aarch64_sys_ins_reg aarch64_sys_regs_ic[] =
 {
     { "ialluis", CPENS(0,C7,C1,0), 0 },