[RFC 23/23] IA64 Linux: Define regset structures

[Andreas Arnez <arnez at linux dot vnet dot ibm dot com>]

gdb/
	* ia64-linux-tdep.c: Include "regset.h".
	(ia64_linux_gregmap, ia64_linux_fpregmap): New register maps.
	(IA64_LINUX_GREGS_SIZE, IA64_LINUX_FPREGS_SIZE): New macros.
	(ia64_linux_supply_fpregset): New function.
	(ia64_linux_gregset, ia64_linux_fpregset): New regsets.
	(ia64_linux_regset_from_core_section): New function.
	(ia64_linux_init_abi): Set regset_from_core_section gdbarch
	method.
---
 gdb/ia64-linux-tdep.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)

diff --git a/gdb/ia64-linux-tdep.c b/gdb/ia64-linux-tdep.c
index 128924e..9989602 100644
--- a/gdb/ia64-linux-tdep.c
+++ b/gdb/ia64-linux-tdep.c
@@ -26,6 +26,7 @@
 #include "solib-svr4.h"
 #include "symtab.h"
 #include "linux-tdep.h"
+#include "regset.h"
 
 #include <ctype.h>
 
@@ -131,6 +132,88 @@ ia64_linux_stap_is_single_operand (struct gdbarch *gdbarch, const char *s)
 	  || isdigit (*s));  /* Literal number.  */
 }
 
+/* Core file support. */
+
+static const struct regcache_map_entry ia64_linux_gregmap[] =
+  {
+    { 32, IA64_GR0_REGNUM },	/* r0 ... r31 */
+    { 8, REGCACHE_MAP_SKIP_BYTES }, /* FIXME: NAT collection bits? */
+    { 1, IA64_PR_REGNUM },
+    { 8, IA64_BR0_REGNUM },	/* b0 ... b7 */
+    { 1, IA64_IP_REGNUM },
+    { 1, IA64_CFM_REGNUM },
+    { 1, IA64_PSR_REGNUM },
+    { 1, IA64_RSC_REGNUM },
+    { 1, IA64_BSP_REGNUM },
+    { 1, IA64_BSPSTORE_REGNUM },
+    { 1, IA64_RNAT_REGNUM },
+    { 1, IA64_CCV_REGNUM },
+    { 1, IA64_UNAT_REGNUM },
+    { 1, IA64_FPSR_REGNUM },
+    { 1, IA64_PFS_REGNUM },
+    { 1, IA64_LC_REGNUM },
+    { 1, IA64_EC_REGNUM },
+    { 0 }
+  };
+
+#define IA64_LINUX_GREGS_SIZE (55 * 8)
+
+static const struct regcache_map_entry ia64_linux_fpregmap[] =
+  {
+    { 128, IA64_FR0_REGNUM },	/* f0 ... f127 */
+    { 0 }
+  };
+
+#define IA64_LINUX_FPREGS_SIZE (128 * 8)
+
+static void
+ia64_linux_supply_fpregset (const struct regset *regset,
+			    struct regcache *regcache,
+			    int regnum, const void *regs, size_t len)
+{
+  const gdb_byte f_zero[16] = { 0 };
+  const gdb_byte f_one[16] =
+    { 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0xff, 0, 0, 0, 0, 0, 0 };
+
+  regcache_supply_regset (regset, regcache, regnum, regs, len);
+
+  /* Kernel generated cores have fr1==0 instead of 1.0.  Older GDBs
+     did the same.  So ignore whatever might be recorded in fpregset_t
+     for fr0/fr1 and always supply their expected values.  */
+  if (regnum == -1 || regnum == IA64_FR0_REGNUM)
+    regcache_raw_supply (regcache, IA64_FR0_REGNUM, f_zero);
+  if (regnum == -1 || regnum == IA64_FR1_REGNUM)
+    regcache_raw_supply (regcache, IA64_FR1_REGNUM, f_one);
+}
+
+static const struct regset ia64_linux_gregset =
+  {
+    ia64_linux_gregmap,
+    regcache_supply_regset, regcache_collect_regset
+  };
+
+static const struct regset ia64_linux_fpregset =
+  {
+    ia64_linux_fpregmap,
+    ia64_linux_supply_fpregset, regcache_collect_regset
+  };
+
+static const struct regset *
+ia64_linux_regset_from_core_section (struct gdbarch *gdbarch,
+				     const char *sect_name,
+				     size_t sect_size)
+{
+  if (strcmp (sect_name, ".reg") == 0
+      && sect_size >= IA64_LINUX_GREGS_SIZE)
+    return &ia64_linux_gregset;
+
+  if (strcmp (sect_name, ".reg2") == 0
+      && sect_size >= IA64_LINUX_FPREGS_SIZE)
+    return &ia64_linux_fpregset;
+
+  return NULL;
+}
+
 static void
 ia64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
@@ -161,6 +244,10 @@ ia64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_gdbarch_fetch_tls_load_module_address (gdbarch,
                                              svr4_fetch_objfile_link_map);
 
+  /* Core file support. */
+  set_gdbarch_regset_from_core_section (gdbarch,
+					ia64_linux_regset_from_core_section);
+
   /* SystemTap related.  */
   set_gdbarch_stap_register_prefixes (gdbarch, stap_register_prefixes);
   set_gdbarch_stap_register_indirection_prefixes (gdbarch,
-- 
1.8.4.2