From 08f9f542cb977e0f69c407ad90c6809ec04a737e Mon Sep 17 00:00:00 2001
From: Andreas Arnez <arnez@linux.vnet.ibm.com>
Date: Thu, 17 Jul 2014 08:35:43 +0000
Subject: [PATCH] M68K Linux: Define regset structures.

---
 gdb/ChangeLog        | 10 +++++++
 gdb/m68klinux-tdep.c | 66 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 76 insertions(+)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 48f7d3c6282..2c2acdd75d9 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,13 @@
+2014-08-07  Andreas Arnez  <arnez@linux.vnet.ibm.com>
+
+	* m68klinux-tdep.c: Include "regset.h".
+	(m68k_linux_gregmap, m68k_linux_fpregmap): New register maps.
+	(M68K_LINUX_GREGS_SIZE, M68K_LINUX_FPREGS_SIZE): New macros.
+	(m68k_linux_gregset, m68k_linux_fpregset): New regsets.
+	(m68k_linux_regset_from_core_section): New function.
+	(m68k_linux_init_abi): Set regset_from_core_section gdbarch
+	method.
+
 2014-08-07  Andreas Arnez  <arnez@linux.vnet.ibm.com>
 
 	* tilegx-linux-tdep.c (tilegx_linux_supply_regset): Delete
diff --git a/gdb/m68klinux-tdep.c b/gdb/m68klinux-tdep.c
index 1aae1529c0c..ae2da9abc89 100644
--- a/gdb/m68klinux-tdep.c
+++ b/gdb/m68klinux-tdep.c
@@ -37,6 +37,7 @@
 #include "observer.h"
 #include "elf/common.h"
 #include "linux-tdep.h"
+#include "regset.h"
 
 /* Offsets (in target ints) into jmp_buf.  */
 
@@ -326,6 +327,67 @@ static const struct frame_unwind m68k_linux_sigtramp_frame_unwind =
   m68k_linux_sigtramp_frame_sniffer
 };
 
+/* Register maps for supply/collect regset functions.  */
+
+static const struct regcache_map_entry m68k_linux_gregmap[] =
+  {
+    { 7, M68K_D1_REGNUM, 4 },	/* d1 ... d7 */
+    { 7, M68K_A0_REGNUM, 4 },	/* a0 ... a6 */
+    { 1, M68K_D0_REGNUM, 4 },
+    { 1, M68K_SP_REGNUM, 4 },
+    { 1, REGCACHE_MAP_SKIP, 4 }, /* orig_d0 (skip) */
+    { 1, M68K_PS_REGNUM, 4 },
+    { 1, M68K_PC_REGNUM, 4 },
+    /* Ignore 16-bit fields 'fmtvec' and '__fill'.  */
+    { 0 }
+  };
+
+#define M68K_LINUX_GREGS_SIZE (20 * 4)
+
+static const struct regcache_map_entry m68k_linux_fpregmap[] =
+  {
+    { 8, M68K_FP0_REGNUM, 12 },	/* fp0 ... fp7 */
+    { 1, M68K_FPC_REGNUM, 4 },
+    { 1, M68K_FPS_REGNUM, 4 },
+    { 1, M68K_FPI_REGNUM, 4 },
+    { 0 }
+  };
+
+#define M68K_LINUX_FPREGS_SIZE (27 * 4)
+
+/* Register sets. */
+
+static const struct regset m68k_linux_gregset =
+  {
+    m68k_linux_gregmap,
+    regcache_supply_regset, regcache_collect_regset
+  };
+
+static const struct regset m68k_linux_fpregset =
+  {
+    m68k_linux_fpregmap,
+    regcache_supply_regset, regcache_collect_regset
+  };
+
+/* Return the appropriate register set for the core section identified
+   by SECT_NAME and SECT_SIZE.  */
+
+static const struct regset *
+m68k_linux_regset_from_core_section (struct gdbarch *gdbarch,
+				     const char *sect_name,
+				     size_t sect_size)
+{
+  if (strcmp (sect_name, ".reg") == 0
+      && sect_size >= M68K_LINUX_GREGS_SIZE)
+    return &m68k_linux_gregset;
+
+  if (strcmp (sect_name, ".reg2") == 0
+      && sect_size >= M68K_LINUX_FPREGS_SIZE)
+    return &m68k_linux_fpregset;
+
+  return NULL;
+}
+
 static void
 m68k_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
@@ -360,6 +422,10 @@ m68k_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 
+  /* Core file support. */
+  set_gdbarch_regset_from_core_section
+    (gdbarch, m68k_linux_regset_from_core_section);
+
   /* Enable TLS support.  */
   set_gdbarch_fetch_tls_load_module_address (gdbarch,
                                              svr4_fetch_objfile_link_map);
-- 
2.30.2