gdbserver/Linux: Introduce NULL_REGSET

[deliverable/binutils-gdb.git] / gdb / gdbserver / linux-xtensa-low.c

diff --git a/gdb/gdbserver/linux-xtensa-low.c b/gdb/gdbserver/linux-xtensa-low.c
index c5ed3516ba5409f92c5f18541944fab3a43534a6..7c71631ad9d41e8822421f0e1673ec5d189cf0c6 100644 (file)
--- a/gdb/gdbserver/linux-xtensa-low.c
+++ b/gdb/gdbserver/linux-xtensa-low.c
@@ -1,5 +1,5 @@
 /* GNU/Linux/Xtensa specific low level interface, for the remote server for GDB.
-   Copyright 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+   Copyright (C) 2007-2015 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -22,9 +22,12 @@
 
 /* Defined in auto-generated file reg-xtensa.c.  */
 void init_registers_xtensa (void);
+extern const struct target_desc *tdesc_xtensa;
 
-#include <sys/ptrace.h>
+#include <asm/ptrace.h>
 #include <xtensa-config.h>
+#include "arch/xtensa.h"
+#include "gdb_proc_service.h"
 
 #include "xtensa-xtregs.c"
 
@@ -40,24 +43,25 @@ static void
 xtensa_fill_gregset (struct regcache *regcache, void *buf)
 {
   elf_greg_t* rset = (elf_greg_t*)buf;
+  const struct target_desc *tdesc = regcache->tdesc;
   int ar0_regnum;
   char *ptr;
   int i;
 
   /* Take care of AR registers.  */
 
-  ar0_regnum = find_regno ("ar0");
+  ar0_regnum = find_regno (tdesc, "ar0");
   ptr = (char*)&rset[R_A0];
 
   for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++)
     {
       collect_register (regcache, i, ptr);
-      ptr += register_size(i);
+      ptr += register_size (tdesc, i);
     }
 
   /* Loop registers, if hardware has it.  */
 
-#if XCHAL_HAVE_LOOP
+#if XCHAL_HAVE_LOOPS
   collect_register_by_name (regcache, "lbeg", (char*)&rset[R_LBEG]);
   collect_register_by_name (regcache, "lend", (char*)&rset[R_LEND]);
   collect_register_by_name (regcache, "lcount", (char*)&rset[R_LCOUNT]);
@@ -74,24 +78,25 @@ static void
 xtensa_store_gregset (struct regcache *regcache, const void *buf)
 {
   const elf_greg_t* rset = (const elf_greg_t*)buf;
+  const struct target_desc *tdesc = regcache->tdesc;
   int ar0_regnum;
   char *ptr;
   int i;
 
   /* Take care of AR registers.  */
 
-  ar0_regnum = find_regno ("ar0");
+  ar0_regnum = find_regno (tdesc, "ar0");
   ptr = (char *)&rset[R_A0];
 
   for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++)
     {
       supply_register (regcache, i, ptr);
-      ptr += register_size(i);
+      ptr += register_size (tdesc, i);
     }
 
   /* Loop registers, if hardware has it.  */
 
-#if XCHAL_HAVE_LOOP
+#if XCHAL_HAVE_LOOPS
   supply_register_by_name (regcache, "lbeg", (char*)&rset[R_LBEG]);
   supply_register_by_name (regcache, "lend", (char*)&rset[R_LEND]);
   supply_register_by_name (regcache, "lcount", (char*)&rset[R_LCOUNT]);
@@ -130,14 +135,14 @@ xtensa_store_xtregset (struct regcache *regcache, const void *buf)
     }
 }
 
-struct regset_info target_regsets[] = {
-  { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t),
+static struct regset_info xtensa_regsets[] = {
+  { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t),
     GENERAL_REGS,
     xtensa_fill_gregset, xtensa_store_gregset },
-  { PTRACE_GETXTREGS, PTRACE_SETXTREGS, XTENSA_ELF_XTREG_SIZE,
+  { PTRACE_GETXTREGS, PTRACE_SETXTREGS, 0, XTENSA_ELF_XTREG_SIZE,
     EXTENDED_REGS,
     xtensa_fill_xtregset, xtensa_store_xtregset },
-  { 0, 0, -1, -1, NULL, NULL }
+  NULL_REGSET
 };
 
 #if XCHAL_HAVE_BE
@@ -146,9 +151,18 @@ struct regset_info target_regsets[] = {
 #define XTENSA_BREAKPOINT {0x2d,0xf0}
 #endif
 
-static const unsigned char xtensa_breakpoint[] = XTENSA_BREAKPOINT;
+static const gdb_byte xtensa_breakpoint[] = XTENSA_BREAKPOINT;
 #define xtensa_breakpoint_len 2
 
+/* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */
+
+static const gdb_byte *
+xtensa_sw_breakpoint_from_kind (int kind, int *size)
+{
+  *size = xtensa_breakpoint_len;
+  return xtensa_breakpoint;
+}
+
 static CORE_ADDR
 xtensa_get_pc (struct regcache *regcache)
 {
@@ -172,20 +186,76 @@ xtensa_breakpoint_at (CORE_ADDR where)
 
     (*the_target->read_memory) (where, (unsigned char *) &insn,
                                xtensa_breakpoint_len);
-    return memcmp((char *)&insn, xtensa_breakpoint, xtensa_breakpoint_len) == 0;
+    return memcmp((char *) &insn,
+                 xtensa_breakpoint, xtensa_breakpoint_len) == 0;
+}
+
+/* Called by libthread_db.  */
+
+ps_err_e
+ps_get_thread_area (const struct ps_prochandle *ph,
+                    lwpid_t lwpid, int idx, void **base)
+{
+  xtensa_elf_gregset_t regs;
+
+  if (ptrace (PTRACE_GETREGS, lwpid, NULL, &regs) != 0)
+    return PS_ERR;
+
+  /* IDX is the bias from the thread pointer to the beginning of the
+     thread descriptor.  It has to be subtracted due to implementation
+     quirks in libthread_db.  */
+  *base = (void *) ((char *) regs.threadptr - idx);
+
+  return PS_OK;
+}
+
+static struct regsets_info xtensa_regsets_info =
+  {
+    xtensa_regsets, /* regsets */
+    0, /* num_regsets */
+    NULL, /* disabled_regsets */
+  };
+
+static struct regs_info regs_info =
+  {
+    NULL, /* regset_bitmap */
+    NULL, /* usrregs */
+    &xtensa_regsets_info
+  };
+
+static void
+xtensa_arch_setup (void)
+{
+  current_process ()->tdesc = tdesc_xtensa;
+}
+
+static const struct regs_info *
+xtensa_regs_info (void)
+{
+  return &regs_info;
 }
 
 struct linux_target_ops the_low_target = {
-  init_registers_xtensa,
-  0,
-  0,
+  xtensa_arch_setup,
+  xtensa_regs_info,
   0,
   0,
+  NULL, /* fetch_register */
   xtensa_get_pc,
   xtensa_set_pc,
-  xtensa_breakpoint,
-  xtensa_breakpoint_len,
+  NULL, /* breakpoint_kind_from_pc */
+  xtensa_sw_breakpoint_from_kind,
   NULL,
   0,
   xtensa_breakpoint_at,
 };
+
+
+void
+initialize_low_arch (void)
+{
+  /* Initialize the Linux target descriptions.  */
+  init_registers_xtensa ();
+
+  initialize_regsets_info (&xtensa_regsets_info);
+}