gdbserver/Linux: Introduce NULL_REGSET

Fixes errors like:

 src/gdb/gdbserver/linux-x86-low.c:477:1: error: invalid conversion from 'int' to 'regset_type' [-fpermissive]

gdb/gdbserver/ChangeLog:
2015-10-29  Pedro Alves  <palves@redhat.com>

	* linux-low.h (NULL_REGSET): Define.
	* linux-aarch64-low.c (aarch64_regsets): Use NULL_REGSET.
	* linux-arm-low.c (arm_regsets): Likewise.
	* linux-crisv32-low.c (cris_regsets): Likewise.
	* linux-m68k-low.c (m68k_regsets): Likewise.
	* linux-mips-low.c (mips_regsets): Likewise.
	* linux-nios2-low.c (nios2_regsets): Likewise.
	* linux-ppc-low.c (ppc_regsets): Likewise.
	* linux-s390-low.c (s390_regsets): Likewise.
	* linux-sh-low.c (sh_regsets): Likewise.
	* linux-sparc-low.c (sparc_regsets): Likewise.
	* linux-tic6x-low.c (tic6x_regsets): Likewise.
	* linux-tile-low.c (tile_regsets): Likewise.
	* linux-x86-low.c (x86_regsets): Likewise.
	* linux-xtensa-low.c (xtensa_regsets): Likewise.

16 files changed, 37 insertions, 14 deletions

diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 1b9e0c4..0dfecf1 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,21 @@
+2015-10-29  Pedro Alves  <palves@redhat.com>
+
+	* linux-low.h (NULL_REGSET): Define.
+	* linux-aarch64-low.c (aarch64_regsets): Use NULL_REGSET.
+	* linux-arm-low.c (arm_regsets): Likewise.
+	* linux-crisv32-low.c (cris_regsets): Likewise.
+	* linux-m68k-low.c (m68k_regsets): Likewise.
+	* linux-mips-low.c (mips_regsets): Likewise.
+	* linux-nios2-low.c (nios2_regsets): Likewise.
+	* linux-ppc-low.c (ppc_regsets): Likewise.
+	* linux-s390-low.c (s390_regsets): Likewise.
+	* linux-sh-low.c (sh_regsets): Likewise.
+	* linux-sparc-low.c (sparc_regsets): Likewise.
+	* linux-tic6x-low.c (tic6x_regsets): Likewise.
+	* linux-tile-low.c (tile_regsets): Likewise.
+	* linux-x86-low.c (x86_regsets): Likewise.
+	* linux-xtensa-low.c (xtensa_regsets): Likewise.
+
 2015-10-26  Doug Evans  <dje@google.com>
 
 	* linux-low.c (__SIGRTMIN): Move to nat/linux-nat.h.
diff --git a/gdb/gdbserver/linux-aarch64-low.c b/gdb/gdbserver/linux-aarch64-low.c
index cb49a04..4f23392 100644
--- a/gdb/gdbserver/linux-aarch64-low.c
+++ b/gdb/gdbserver/linux-aarch64-low.c
@@ -539,7 +539,7 @@ static struct regset_info aarch64_regsets[] =
     sizeof (struct user_fpsimd_state), FP_REGS,
     aarch64_fill_fpregset, aarch64_store_fpregset
   },
-  { 0, 0, 0, -1, -1, NULL, NULL }
+  NULL_REGSET
 };
 
 static struct regsets_info aarch64_regsets_info =
diff --git a/gdb/gdbserver/linux-arm-low.c b/gdb/gdbserver/linux-arm-low.c
index d3ae9f4..bab2aaf 100644
--- a/gdb/gdbserver/linux-arm-low.c
+++ b/gdb/gdbserver/linux-arm-low.c
@@ -898,7 +898,7 @@ static struct regset_info arm_regsets[] = {
   { PTRACE_GETVFPREGS, PTRACE_SETVFPREGS, 0, 32 * 8 + 4,
     EXTENDED_REGS,
     arm_fill_vfpregset, arm_store_vfpregset },
-  { 0, 0, 0, -1, -1, NULL, NULL }
+  NULL_REGSET
 };
 
 static struct regsets_info arm_regsets_info =
diff --git a/gdb/gdbserver/linux-crisv32-low.c b/gdb/gdbserver/linux-crisv32-low.c
index f97122e..8d9ef04 100644
--- a/gdb/gdbserver/linux-crisv32-low.c
+++ b/gdb/gdbserver/linux-crisv32-low.c
@@ -391,7 +391,7 @@ cris_arch_setup (void)
 static struct regset_info cris_regsets[] = {
   { PTRACE_GETREGS, PTRACE_SETREGS, 0, cris_num_regs * 4,
     GENERAL_REGS, cris_fill_gregset, cris_store_gregset },
-  { 0, 0, 0, -1, -1, NULL, NULL }
+  NULL_REGSET
 };
 
 
diff --git a/gdb/gdbserver/linux-low.h b/gdb/gdbserver/linux-low.h
index 28dd4db..ccf4c94 100644
--- a/gdb/gdbserver/linux-low.h
+++ b/gdb/gdbserver/linux-low.h
@@ -38,6 +38,11 @@ enum regset_type {
   EXTENDED_REGS,
 };
 
+/* The arch's regsets array initializer must be terminated with a NULL
+   regset.  */
+#define NULL_REGSET \
+  { 0, 0, 0, -1, (enum regset_type) -1, NULL, NULL }
+
 struct regset_info
 {
   int get_request, set_request;
diff --git a/gdb/gdbserver/linux-m68k-low.c b/gdb/gdbserver/linux-m68k-low.c
index ba8e5e9..10129a6 100644
--- a/gdb/gdbserver/linux-m68k-low.c
+++ b/gdb/gdbserver/linux-m68k-low.c
@@ -119,7 +119,7 @@ static struct regset_info m68k_regsets[] = {
     FP_REGS,
     m68k_fill_fpregset, m68k_store_fpregset },
 #endif /* HAVE_PTRACE_GETREGS */
-  { 0, 0, 0, -1, -1, NULL, NULL }
+  NULL_REGSET
 };
 
 static const gdb_byte m68k_breakpoint[] = { 0x4E, 0x4F };
diff --git a/gdb/gdbserver/linux-mips-low.c b/gdb/gdbserver/linux-mips-low.c
index 344d7a5..86f7962 100644
--- a/gdb/gdbserver/linux-mips-low.c
+++ b/gdb/gdbserver/linux-mips-low.c
@@ -837,7 +837,7 @@ static struct regset_info mips_regsets[] = {
   { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, 33 * 8, FP_REGS,
     mips_fill_fpregset, mips_store_fpregset },
 #endif /* HAVE_PTRACE_GETREGS */
-  { 0, 0, 0, -1, -1, NULL, NULL }
+  NULL_REGSET
 };
 
 static struct regsets_info mips_regsets_info =
diff --git a/gdb/gdbserver/linux-nios2-low.c b/gdb/gdbserver/linux-nios2-low.c
index 95a2d9e..369e89c 100644
--- a/gdb/gdbserver/linux-nios2-low.c
+++ b/gdb/gdbserver/linux-nios2-low.c
@@ -239,7 +239,7 @@ static struct regset_info nios2_regsets[] =
   { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS,
     nios2_num_regs * 4, GENERAL_REGS,
     nios2_fill_gregset, nios2_store_gregset },
-  { 0, 0, 0, -1, -1, NULL, NULL }
+  NULL_REGSET
 };
 
 static struct regsets_info nios2_regsets_info =
diff --git a/gdb/gdbserver/linux-ppc-low.c b/gdb/gdbserver/linux-ppc-low.c
index 6e6a936..9e223ea 100644
--- a/gdb/gdbserver/linux-ppc-low.c
+++ b/gdb/gdbserver/linux-ppc-low.c
@@ -657,7 +657,7 @@ static struct regset_info ppc_regsets[] = {
   { PTRACE_GETEVRREGS, PTRACE_SETEVRREGS, 0, 32 * 4 + 8 + 4, EXTENDED_REGS,
     ppc_fill_evrregset, ppc_store_evrregset },
   { 0, 0, 0, 0, GENERAL_REGS, ppc_fill_gregset, NULL },
-  { 0, 0, 0, -1, -1, NULL, NULL }
+  NULL_REGSET
 };
 
 static struct usrregs_info ppc_usrregs_info =
diff --git a/gdb/gdbserver/linux-s390-low.c b/gdb/gdbserver/linux-s390-low.c
index 2ba1221..efede2d 100644
--- a/gdb/gdbserver/linux-s390-low.c
+++ b/gdb/gdbserver/linux-s390-low.c
@@ -390,7 +390,7 @@ static struct regset_info s390_regsets[] = {
     EXTENDED_REGS, s390_fill_vxrs_low, s390_store_vxrs_low },
   { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_S390_VXRS_HIGH, 0,
     EXTENDED_REGS, s390_fill_vxrs_high, s390_store_vxrs_high },
-  { 0, 0, 0, -1, -1, NULL, NULL }
+  NULL_REGSET
 };
 
 
diff --git a/gdb/gdbserver/linux-sh-low.c b/gdb/gdbserver/linux-sh-low.c
index f7f3239..207e87e 100644
--- a/gdb/gdbserver/linux-sh-low.c
+++ b/gdb/gdbserver/linux-sh-low.c
@@ -114,7 +114,7 @@ static void sh_fill_gregset (struct regcache *regcache, void *buf)
 
 static struct regset_info sh_regsets[] = {
   { 0, 0, 0, 0, GENERAL_REGS, sh_fill_gregset, NULL },
-  { 0, 0, 0, -1, -1, NULL, NULL }
+  NULL_REGSET
 };
 
 static struct regsets_info sh_regsets_info =
diff --git a/gdb/gdbserver/linux-sparc-low.c b/gdb/gdbserver/linux-sparc-low.c
index 0691867..e6a4f84 100644
--- a/gdb/gdbserver/linux-sparc-low.c
+++ b/gdb/gdbserver/linux-sparc-low.c
@@ -291,7 +291,7 @@ static struct regset_info sparc_regsets[] = {
   { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t),
     FP_REGS,
     sparc_fill_fpregset, sparc_store_fpregset },
-  { 0, 0, 0, -1, -1, NULL, NULL }
+  NULL_REGSET
 };
 
 static struct regsets_info sparc_regsets_info =
diff --git a/gdb/gdbserver/linux-tic6x-low.c b/gdb/gdbserver/linux-tic6x-low.c
index d9476fd..cf8b5fb 100644
--- a/gdb/gdbserver/linux-tic6x-low.c
+++ b/gdb/gdbserver/linux-tic6x-low.c
@@ -332,7 +332,7 @@ tic6x_store_gregset (struct regcache *regcache, const void *buf)
 static struct regset_info tic6x_regsets[] = {
   { PTRACE_GETREGS, PTRACE_SETREGS, 0, TIC6X_NUM_REGS * 4, GENERAL_REGS,
     tic6x_fill_gregset, tic6x_store_gregset },
-  { 0, 0, 0, -1, -1, NULL, NULL }
+  NULL_REGSET
 };
 
 static void
diff --git a/gdb/gdbserver/linux-tile-low.c b/gdb/gdbserver/linux-tile-low.c
index e31a620..47ca245 100644
--- a/gdb/gdbserver/linux-tile-low.c
+++ b/gdb/gdbserver/linux-tile-low.c
@@ -135,7 +135,7 @@ static struct regset_info tile_regsets[] =
 {
   { PTRACE_GETREGS, PTRACE_SETREGS, 0, tile_num_regs * 8,
     GENERAL_REGS, tile_fill_gregset, tile_store_gregset },
-  { 0, 0, 0, -1, -1, NULL, NULL }
+  NULL_REGSET
 };
 
 static struct regsets_info tile_regsets_info =
diff --git a/gdb/gdbserver/linux-x86-low.c b/gdb/gdbserver/linux-x86-low.c
index 406d552..89ec4e5 100644
--- a/gdb/gdbserver/linux-x86-low.c
+++ b/gdb/gdbserver/linux-x86-low.c
@@ -463,7 +463,7 @@ static struct regset_info x86_regsets[] =
     FP_REGS,
     x86_fill_fpregset, x86_store_fpregset },
 #endif /* HAVE_PTRACE_GETREGS */
-  { 0, 0, 0, -1, -1, NULL, NULL }
+  NULL_REGSET
 };
 
 static CORE_ADDR
diff --git a/gdb/gdbserver/linux-xtensa-low.c b/gdb/gdbserver/linux-xtensa-low.c
index fa6f418..7c71631 100644
--- a/gdb/gdbserver/linux-xtensa-low.c
+++ b/gdb/gdbserver/linux-xtensa-low.c
@@ -142,7 +142,7 @@ static struct regset_info xtensa_regsets[] = {
   { PTRACE_GETXTREGS, PTRACE_SETXTREGS, 0, XTENSA_ELF_XTREG_SIZE,
     EXTENDED_REGS,
     xtensa_fill_xtregset, xtensa_store_xtregset },
-  { 0, 0, 0, -1, -1, NULL, NULL }
+  NULL_REGSET
 };
 
 #if XCHAL_HAVE_BE