22 files changed, 80 insertions, 46 deletions
diff --git a/gdbserver/ChangeLog b/gdbserver/ChangeLog
index 8aaca90c061..5f543bb5fa5 100644
--- a/gdbserver/ChangeLog
+++ b/gdbserver/ChangeLog
@@ -1,5 +1,49 @@
 2020-04-02  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>
 
+	Turn the 'fetch_register' linux target op into a method of
+	linux_process_target.
+
+	* linux-low.h (struct linux_target_ops) <fetch_register>: Remove.
+	(class linux_process_target) <low_fetch_register>: Declare.
+	* linux-x86-low.cc (the_low_target)
+	* linux-aarch64-low.cc (the_low_target)
+	* linux-arm-low.cc (the_low_target)
+	* linux-bfin-low.cc (the_low_target)
+	* linux-cris-low.cc (the_low_target)
+	* linux-crisv32-low.cc (the_low_target)
+	* linux-m32r-low.cc (the_low_target)
+	* linux-m68k-low.cc (the_low_target)
+	* linux-nios2-low.cc (the_low_target)
+	* linux-ppc-low.cc (the_low_target)
+	* linux-s390-low.cc (the_low_target)
+	* linux-sh-low.cc (the_low_target)
+	* linux-sparc-low.cc (the_low_target)
+	* linux-tic6x-low.cc (the_low_target)
+	* linux-tile-low.cc (the_low_target)
+	* linux-xtensa-low.cc (the_low_target): Remove the op field.
+	* linux-ia64-low.cc (class ia64_target) <low_fetch_register>:
+	Declare.
+	(ia64_fetch_register): Turn into...
+	(ia64_target::low_fetch_register): ...this.
+	(the_low_target): Remove the op field.
+	* linux-mips-low.cc (class mips_target) <low_fetch_register>:
+	Declare.
+	(mips_fetch_register): Turn into...
+	(mips_target::low_fetch_register): ...this.
+	(the_low_target): Remove the op field.
+	* linux-riscv-low.cc (class riscv_target) <low_fetch_register>:
+	Declare.
+	(riscv_fetch_register): Turn into...
+	(riscv_target::low_fetch_register): ...this.
+	(the_low_target): Remove the op field.
+
+	Update the callers below.
+
+	* linux-low.cc (linux_process_target::fetch_registers)
+	(linux_process_target::low_fetch_register)
+
+2020-04-02  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>
+
 	Turn the 'cannot_fetch_register' and 'cannot_store_register'
 	linux target ops into methods of linux_process_target.
 
diff --git a/gdbserver/linux-aarch64-low.cc b/gdbserver/linux-aarch64-low.cc
index 19484219d73..0bcac19384a 100644
--- a/gdbserver/linux-aarch64-low.cc
+++ b/gdbserver/linux-aarch64-low.cc
@@ -3085,7 +3085,6 @@ aarch64_supports_hardware_single_step (void)
 
 struct linux_target_ops the_low_target =
 {
-  NULL, /* fetch_register */
   aarch64_get_pc,
   aarch64_set_pc,
   aarch64_breakpoint_kind_from_pc,
diff --git a/gdbserver/linux-arm-low.cc b/gdbserver/linux-arm-low.cc
index 896c5fd1e64..1bbf0e6977f 100644
--- a/gdbserver/linux-arm-low.cc
+++ b/gdbserver/linux-arm-low.cc
@@ -1027,7 +1027,6 @@ arm_target::get_regs_info ()
 }
 
 struct linux_target_ops the_low_target = {
-  NULL, /* fetch_register */
   linux_get_pc_32bit,
   linux_set_pc_32bit,
   arm_breakpoint_kind_from_pc,
diff --git a/gdbserver/linux-bfin-low.cc b/gdbserver/linux-bfin-low.cc
index e7cd1e29637..a8bb8f03ce0 100644
--- a/gdbserver/linux-bfin-low.cc
+++ b/gdbserver/linux-bfin-low.cc
@@ -135,7 +135,6 @@ bfin_target::get_regs_info ()
 }
 
 struct linux_target_ops the_low_target = {
-  NULL, /* fetch_register */
   linux_get_pc_32bit,
   linux_set_pc_32bit,
   NULL, /* breakpoint_kind_from_pc */
diff --git a/gdbserver/linux-cris-low.cc b/gdbserver/linux-cris-low.cc
index 03ca52e39e4..7956922f7e5 100644
--- a/gdbserver/linux-cris-low.cc
+++ b/gdbserver/linux-cris-low.cc
@@ -132,7 +132,6 @@ cris_target::get_regs_info ()
 }
 
 struct linux_target_ops the_low_target = {
-  NULL, /* fetch_register */
   linux_get_pc_32bit,
   linux_set_pc_32bit,
   NULL, /* breakpoint_kind_from_pc */
diff --git a/gdbserver/linux-crisv32-low.cc b/gdbserver/linux-crisv32-low.cc
index 03f0aa138e2..828ac111d10 100644
--- a/gdbserver/linux-crisv32-low.cc
+++ b/gdbserver/linux-crisv32-low.cc
@@ -429,7 +429,6 @@ crisv32_target::get_regs_info ()
 }
 
 struct linux_target_ops the_low_target = {
-  NULL, /* fetch_register */
   linux_get_pc_32bit,
   linux_set_pc_32bit,
   NULL, /* breakpoint_kind_from_pc */
diff --git a/gdbserver/linux-ia64-low.cc b/gdbserver/linux-ia64-low.cc
index 471530a621b..377df4f75c3 100644
--- a/gdbserver/linux-ia64-low.cc
+++ b/gdbserver/linux-ia64-low.cc
@@ -38,6 +38,8 @@ protected:
   bool low_cannot_fetch_register (int regno) override;
 
   bool low_cannot_store_register (int regno) override;
+
+  bool low_fetch_register (regcache *regcache, int regno) override;
 };
 
 /* The singleton target ops object.  */
@@ -304,8 +306,8 @@ ia64_target::low_cannot_fetch_register (int regno)
 #define IA64_FR0_REGNUM		128
 #define IA64_FR1_REGNUM		129
 
-static int
-ia64_fetch_register (struct regcache *regcache, int regnum)
+bool
+ia64_target::low_fetch_register (regcache *regcache, int regnum)
 {
   /* r0 cannot be fetched but is always zero.  */
   if (regnum == IA64_GR0_REGNUM)
@@ -314,7 +316,7 @@ ia64_fetch_register (struct regcache *regcache, int regnum)
 
       gdb_assert (sizeof (zero) == register_size (regcache->tdesc, regnum));
       supply_register (regcache, regnum, zero);
-      return 1;
+      return true;
     }
 
   /* fr0 cannot be fetched but is always zero.  */
@@ -324,7 +326,7 @@ ia64_fetch_register (struct regcache *regcache, int regnum)
 
       gdb_assert (sizeof (f_zero) == register_size (regcache->tdesc, regnum));
       supply_register (regcache, regnum, f_zero);
-      return 1;
+      return true;
     }
 
   /* fr1 cannot be fetched but is always one (1.0).  */
@@ -335,10 +337,10 @@ ia64_fetch_register (struct regcache *regcache, int regnum)
 
       gdb_assert (sizeof (f_one) == register_size (regcache->tdesc, regnum));
       supply_register (regcache, regnum, f_one);
-      return 1;
+      return true;
     }
 
-  return 0;
+  return false;
 }
 
 static struct usrregs_info ia64_usrregs_info =
@@ -367,7 +369,6 @@ ia64_target::low_arch_setup ()
 
 
 struct linux_target_ops the_low_target = {
-  ia64_fetch_register,
 };
 
 /* The linux target ops object.  */
diff --git a/gdbserver/linux-low.cc b/gdbserver/linux-low.cc
index caa2d8dbd58..c77e92d17b1 100644
--- a/gdbserver/linux-low.cc
+++ b/gdbserver/linux-low.cc
@@ -5569,10 +5569,9 @@ linux_process_target::fetch_registers (regcache *regcache, int regno)
 
   if (regno == -1)
     {
-      if (the_low_target.fetch_register != NULL
-	  && regs_info->usrregs != NULL)
+      if (regs_info->usrregs != NULL)
 	for (regno = 0; regno < regs_info->usrregs->num_regs; regno++)
-	  (*the_low_target.fetch_register) (regcache, regno);
+	  low_fetch_register (regcache, regno);
 
       all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache);
       if (regs_info->usrregs != NULL)
@@ -5580,8 +5579,7 @@ linux_process_target::fetch_registers (regcache *regcache, int regno)
     }
   else
     {
-      if (the_low_target.fetch_register != NULL
-	  && (*the_low_target.fetch_register) (regcache, regno))
+      if (low_fetch_register (regcache, regno))
 	return;
 
       use_regsets = linux_register_in_regsets (regs_info, regno);
@@ -5618,6 +5616,11 @@ linux_process_target::store_registers (regcache *regcache, int regno)
     }
 }
 
+bool
+linux_process_target::low_fetch_register (regcache *regcache, int regno)
+{
+  return false;
+}
 
 /* A wrapper for the read_memory target op.  */
 
diff --git a/gdbserver/linux-low.h b/gdbserver/linux-low.h
index 65c570e0669..7ac9086fb99 100644
--- a/gdbserver/linux-low.h
+++ b/gdbserver/linux-low.h
@@ -131,13 +131,6 @@ struct lwp_info;
 
 struct linux_target_ops
 {
-  /* Hook to fetch a register in some non-standard way.  Used for
-     example by backends that have read-only registers with hardcoded
-     values (e.g., IA64's gr0/fr0/fr1).  Returns true if register
-     REGNO was supplied, false if not, and we should fallback to the
-     standard ptrace methods.  */
-  int (*fetch_register) (struct regcache *regcache, int regno);
-
   CORE_ADDR (*get_pc) (struct regcache *regcache);
   void (*set_pc) (struct regcache *regcache, CORE_ADDR newpc);
 
@@ -598,6 +591,13 @@ protected:
   virtual bool low_cannot_fetch_register (int regno) = 0;
 
   virtual bool low_cannot_store_register (int regno) = 0;
+
+  /* Hook to fetch a register in some non-standard way.  Used for
+     example by backends that have read-only registers with hardcoded
+     values (e.g., IA64's gr0/fr0/fr1).  Returns true if register
+     REGNO was supplied, false if not, and we should fallback to the
+     standard ptrace methods.  */
+  virtual bool low_fetch_register (regcache *regcache, int regno);
 };
 
 extern linux_process_target *the_linux_target;
diff --git a/gdbserver/linux-m32r-low.cc b/gdbserver/linux-m32r-low.cc
index 912708db817..82a503401b8 100644
--- a/gdbserver/linux-m32r-low.cc
+++ b/gdbserver/linux-m32r-low.cc
@@ -134,7 +134,6 @@ m32r_target::get_regs_info ()
 }
 
 struct linux_target_ops the_low_target = {
-  NULL, /* fetch_register */
   linux_get_pc_32bit,
   linux_set_pc_32bit,
   NULL, /* breakpoint_from_pc */
diff --git a/gdbserver/linux-m68k-low.cc b/gdbserver/linux-m68k-low.cc
index 08545aa946f..6a3a2aab383 100644
--- a/gdbserver/linux-m68k-low.cc
+++ b/gdbserver/linux-m68k-low.cc
@@ -229,7 +229,6 @@ m68k_supports_hardware_single_step (void)
 }
 
 struct linux_target_ops the_low_target = {
-  NULL, /* fetch_register */
   linux_get_pc_32bit,
   linux_set_pc_32bit,
   NULL, /* breakpoint_kind_from_pc */
diff --git a/gdbserver/linux-mips-low.cc b/gdbserver/linux-mips-low.cc
index 0900dc88e0b..ae925ffb6cc 100644
--- a/gdbserver/linux-mips-low.cc
+++ b/gdbserver/linux-mips-low.cc
@@ -40,6 +40,8 @@ protected:
   bool low_cannot_fetch_register (int regno) override;
 
   bool low_cannot_store_register (int regno) override;
+
+  bool low_fetch_register (regcache *regcache, int regno) override;
 };
 
 /* The singleton target ops object.  */
@@ -263,18 +265,18 @@ mips_target::low_cannot_store_register (int regno)
   return false;
 }
 
-static int
-mips_fetch_register (struct regcache *regcache, int regno)
+bool
+mips_target::low_fetch_register (regcache *regcache, int regno)
 {
   const struct target_desc *tdesc = current_process ()->tdesc;
 
   if (find_regno (tdesc, "r0") == regno)
     {
       supply_register_zeroed (regcache, regno);
-      return 1;
+      return true;
     }
 
-  return 0;
+  return false;
 }
 
 static CORE_ADDR
@@ -950,7 +952,6 @@ mips_target::get_regs_info ()
 }
 
 struct linux_target_ops the_low_target = {
-  mips_fetch_register,
   mips_get_pc,
   mips_set_pc,
   NULL, /* breakpoint_kind_from_pc */
diff --git a/gdbserver/linux-nios2-low.cc b/gdbserver/linux-nios2-low.cc
index adbb0f2622e..a58d9ca99fb 100644
--- a/gdbserver/linux-nios2-low.cc
+++ b/gdbserver/linux-nios2-low.cc
@@ -251,7 +251,6 @@ nios2_target::get_regs_info ()
 
 struct linux_target_ops the_low_target =
 {
-  NULL,
   linux_get_pc_32bit,
   linux_set_pc_32bit,
   NULL, /* breakpoint_kind_from_pc */
diff --git a/gdbserver/linux-ppc-low.cc b/gdbserver/linux-ppc-low.cc
index 968538df370..096308a44d8 100644
--- a/gdbserver/linux-ppc-low.cc
+++ b/gdbserver/linux-ppc-low.cc
@@ -3392,7 +3392,6 @@ ppc_get_ipa_tdesc_idx (void)
 }
 
 struct linux_target_ops the_low_target = {
-  NULL, /* fetch_register */
   ppc_get_pc,
   ppc_set_pc,
   NULL, /* breakpoint_kind_from_pc */
diff --git a/gdbserver/linux-riscv-low.cc b/gdbserver/linux-riscv-low.cc
index 4f2e28beafc..69af59f7200 100644
--- a/gdbserver/linux-riscv-low.cc
+++ b/gdbserver/linux-riscv-low.cc
@@ -45,6 +45,8 @@ protected:
   bool low_cannot_fetch_register (int regno) override;
 
   bool low_cannot_store_register (int regno) override;
+
+  bool low_fetch_register (regcache *regcache, int regno) override;
 };
 
 /* The singleton target ops object.  */
@@ -188,17 +190,17 @@ riscv_target::get_regs_info ()
   return &riscv_regs;
 }
 
-/* Implementation of linux_target_ops method "fetch_register".  */
+/* Implementation of linux target ops method "low_fetch_register".  */
 
-static int
-riscv_fetch_register (struct regcache *regcache, int regno)
+bool
+riscv_target::low_fetch_register (regcache *regcache, int regno)
 {
   const struct target_desc *tdesc = regcache->tdesc;
 
   if (regno != find_regno (tdesc, "zero"))
-    return 0;
+    return false;
   supply_register_zeroed (regcache, regno);
-  return 1;
+  return true;
 }
 
 /* Implementation of linux_target_ops method "get_pc".  */
@@ -291,7 +293,6 @@ riscv_breakpoint_at (CORE_ADDR pc)
 /* RISC-V/Linux target operations.  */
 struct linux_target_ops the_low_target =
 {
-  riscv_fetch_register,
   riscv_get_pc,
   riscv_set_pc,
   riscv_breakpoint_kind_from_pc,
diff --git a/gdbserver/linux-s390-low.cc b/gdbserver/linux-s390-low.cc
index 2ba0dec0551..d25fafa4cdf 100644
--- a/gdbserver/linux-s390-low.cc
+++ b/gdbserver/linux-s390-low.cc
@@ -2812,7 +2812,6 @@ s390_emit_ops (void)
 }
 
 struct linux_target_ops the_low_target = {
-  NULL, /* fetch_register */
   s390_get_pc,
   s390_set_pc,
   NULL, /* breakpoint_kind_from_pc */
diff --git a/gdbserver/linux-sh-low.cc b/gdbserver/linux-sh-low.cc
index b4fd534547e..42bd427d47c 100644
--- a/gdbserver/linux-sh-low.cc
+++ b/gdbserver/linux-sh-low.cc
@@ -164,7 +164,6 @@ sh_target::low_arch_setup ()
 }
 
 struct linux_target_ops the_low_target = {
-  NULL, /* fetch_register */
   linux_get_pc_32bit,
   linux_set_pc_32bit,
   NULL, /* breakpoint_kind_from_pc */
diff --git a/gdbserver/linux-sparc-low.cc b/gdbserver/linux-sparc-low.cc
index 4e0d930f800..b68ed2d36ad 100644
--- a/gdbserver/linux-sparc-low.cc
+++ b/gdbserver/linux-sparc-low.cc
@@ -319,7 +319,6 @@ sparc_target::get_regs_info ()
 }
 
 struct linux_target_ops the_low_target = {
-  NULL, /* fetch_register */
   linux_get_pc_64bit,
   /* No sparc_set_pc is needed.  */
   NULL,
diff --git a/gdbserver/linux-tic6x-low.cc b/gdbserver/linux-tic6x-low.cc
index be6eb98b45c..5cfdd091c38 100644
--- a/gdbserver/linux-tic6x-low.cc
+++ b/gdbserver/linux-tic6x-low.cc
@@ -407,7 +407,6 @@ tic6x_target::get_regs_info ()
 }
 
 struct linux_target_ops the_low_target = {
-  NULL, /* fetch_register */
   tic6x_get_pc,
   tic6x_set_pc,
   NULL, /* breakpoint_kind_from_pc */
diff --git a/gdbserver/linux-tile-low.cc b/gdbserver/linux-tile-low.cc
index b9af7af7fb5..a6138e78aa7 100644
--- a/gdbserver/linux-tile-low.cc
+++ b/gdbserver/linux-tile-low.cc
@@ -196,7 +196,6 @@ tile_supports_hardware_single_step (void)
 
 struct linux_target_ops the_low_target =
 {
-  NULL,
   linux_get_pc_64bit,
   linux_set_pc_64bit,
   NULL, /* breakpoint_kind_from_pc */
diff --git a/gdbserver/linux-x86-low.cc b/gdbserver/linux-x86-low.cc
index 8c9ab733ea8..475d77767f5 100644
--- a/gdbserver/linux-x86-low.cc
+++ b/gdbserver/linux-x86-low.cc
@@ -2885,7 +2885,6 @@ x86_get_ipa_tdesc_idx (void)
 
 struct linux_target_ops the_low_target =
 {
-  NULL, /* fetch_register */
   x86_get_pc,
   x86_set_pc,
   NULL, /* breakpoint_kind_from_pc */
diff --git a/gdbserver/linux-xtensa-low.cc b/gdbserver/linux-xtensa-low.cc
index 876c2ad63e0..d71b2c97fa4 100644
--- a/gdbserver/linux-xtensa-low.cc
+++ b/gdbserver/linux-xtensa-low.cc
@@ -302,7 +302,6 @@ xtensa_target::get_regs_info ()
 }
 
 struct linux_target_ops the_low_target = {
-  NULL, /* fetch_register */
   linux_get_pc_32bit,
   linux_set_pc_32bit,
   NULL, /* breakpoint_kind_from_pc */