Move gdbserver to top level

This patch moves gdbserver to the top level.

This patch is as close to a pure move as possible -- gdbserver still
builds its own variant of gnulib and gdbsupport.  Changing this will
be done in a separate patch.

[v2] Note that, per Simon's review comment, this patch changes the
tree so that gdbserver is not built for or1k or score.  This makes
sense, because there is apparently not actually a gdbserver port here.

[v3] This version of the patch also splits out some configury into a
new file, gdbserver/configure.host, so that the top-level configure
script can simply rely on it in order to decide whether gdbserver
should be built.

[v4] This version adds documentation and removes some unnecessary
top-level dependencies.

[v5] Update docs to mention "make all-gdbserver" and change how
top-level configure decides whether to build gdbserver, switching to a
single, shared script.

Tested by the buildbot.

ChangeLog
2020-02-07  Tom Tromey  <tom@tromey.com>
	    Pedro Alves  <palves@redhat.com>

	* src-release.sh (GDB_SUPPORT_DIRS): Add gdbserver.
	* gdbserver: New directory, moved from gdb/gdbserver.
	* configure.ac (host_tools): Add gdbserver.
	Only build gdbserver on certain systems.
	* Makefile.in, configure: Rebuild.
	* Makefile.def (host_modules, dependencies): Add gdbserver.
	* MAINTAINERS: Add gdbserver.

gdb/ChangeLog
2020-02-07  Tom Tromey  <tom@tromey.com>

	* README: Update gdbserver documentation.
	* gdbserver: Move to top level.
	* configure.tgt (build_gdbserver): Remove.
	* configure.ac: Remove --enable-gdbserver.
	* configure: Rebuild.
	* Makefile.in (distclean): Don't mention gdbserver.

Change-Id: I826b7565b54604711dc7a11edea0499cd51ff39e

1 files changed, 0 insertions, 358 deletions

diff --git a/gdb/gdbserver/lynx-i386-low.c b/gdb/gdbserver/lynx-i386-low.c
deleted file mode 100644
index d00e1a1..0000000
--- a/gdb/gdbserver/lynx-i386-low.c
+++ /dev/null
@@ -1,358 +0,0 @@
-/* Copyright (C) 2010-2020 Free Software Foundation, Inc.
-
-   This file is part of GDB.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-#include "server.h"
-#include "lynx-low.h"
-#include <limits.h>
-#include <sys/ptrace.h>
-#include "gdbsupport/x86-xstate.h"
-#include "arch/i386.h"
-#include "x86-tdesc.h"
-
-/* The following two typedefs are defined in a .h file which is not
-   in the standard include path (/sys/include/family/x86/ucontext.h),
-   so we just duplicate them here.
-
-   Unfortunately for us, the definition of this structure differs between
-   LynxOS 5.x and LynxOS 178.  Rather than duplicate the code, we use
-   different definitions depending on the target.  */
-
-#ifdef VMOS_DEV
-#define LYNXOS_178
-#endif
-
-/* General register context */
-typedef struct usr_econtext {
-
-    uint32_t    uec_fault;
-    uint32_t    uec_es;
-    uint32_t    uec_ds;
-    uint32_t    uec_edi;
-    uint32_t    uec_esi;
-    uint32_t    uec_ebp;
-    uint32_t    uec_temp;
-    uint32_t    uec_ebx;
-    uint32_t    uec_edx;
-    uint32_t    uec_ecx;
-    uint32_t    uec_eax;
-    uint32_t    uec_inum;
-    uint32_t    uec_ecode;
-    uint32_t    uec_eip;
-    uint32_t    uec_cs;
-    uint32_t    uec_eflags;
-    uint32_t    uec_esp;
-    uint32_t    uec_ss;
-    uint32_t    uec_fs;
-    uint32_t    uec_gs;
-} usr_econtext_t;
-
-#if defined(LYNXOS_178)
-
-/* Floating point register context                                                                                      */
-typedef struct usr_fcontext {
-        uint32_t         ufc_control;
-        uint32_t         ufc_status;
-        uint32_t         ufc_tag;
-        uint8_t         *ufc_inst_off;
-        uint32_t         ufc_inst_sel;
-        uint8_t         *ufc_data_off;
-        uint32_t         ufc_data_sel;
-        struct ufp387_real {
-                uint16_t        umant4;
-        uint16_t        umant3;
-        uint16_t        umant2;
-        uint16_t        umant1;
-        uint16_t        us_and_e;
-        } ufc_reg[8];
-} usr_fcontext_t;
-
-#else /* This is LynxOS 5.x.  */
-
-/* Floating point and SIMD register context */
-typedef struct usr_fcontext {
-        uint16_t         ufc_control;
-        uint16_t         ufc_status;
-        uint16_t         ufc_tag;
-        uint16_t         ufc_opcode;
-        uint8_t         *ufc_inst_off;
-        uint32_t         ufc_inst_sel;
-        uint8_t         *ufc_data_off;
-        uint32_t         ufc_data_sel;
-        uint32_t         usse_mxcsr;
-        uint32_t         usse_mxcsr_mask;
-        struct ufp387_real {
-                uint16_t umant4;
-                uint16_t umant3;
-                uint16_t umant2;
-                uint16_t umant1;
-                uint16_t us_and_e;
-                uint16_t ureserved_1;
-                uint16_t ureserved_2;
-                uint16_t ureserved_3;
-        } ufc_reg[8];
-        struct uxmm_register {
-                uint16_t uchunk_1;
-                uint16_t uchunk_2;
-                uint16_t uchunk_3;
-                uint16_t uchunk_4;
-                uint16_t uchunk_5;
-                uint16_t uchunk_6;
-                uint16_t uchunk_7;
-                uint16_t uchunk_8;
-        } uxmm_reg[8];
-        char ureserved[16][14];
-} usr_fcontext_t;
-
-#endif
-
-/* The index of various registers inside the regcache.  */
-
-enum lynx_i386_gdb_regnum
-{
-  I386_EAX_REGNUM,
-  I386_ECX_REGNUM,
-  I386_EDX_REGNUM,
-  I386_EBX_REGNUM,
-  I386_ESP_REGNUM,
-  I386_EBP_REGNUM,
-  I386_ESI_REGNUM,
-  I386_EDI_REGNUM,
-  I386_EIP_REGNUM,
-  I386_EFLAGS_REGNUM,
-  I386_CS_REGNUM,
-  I386_SS_REGNUM,
-  I386_DS_REGNUM,
-  I386_ES_REGNUM,
-  I386_FS_REGNUM,
-  I386_GS_REGNUM,
-  I386_ST0_REGNUM,
-  I386_FCTRL_REGNUM = I386_ST0_REGNUM + 8,
-  I386_FSTAT_REGNUM,
-  I386_FTAG_REGNUM,
-  I386_FISEG_REGNUM,
-  I386_FIOFF_REGNUM,
-  I386_FOSEG_REGNUM,
-  I386_FOOFF_REGNUM,
-  I386_FOP_REGNUM,
-  I386_XMM0_REGNUM = 32,
-  I386_MXCSR_REGNUM = I386_XMM0_REGNUM + 8,
-  I386_SENTINEL_REGUM
-};
-
-/* The fill_function for the general-purpose register set.  */
-
-static void
-lynx_i386_fill_gregset (struct regcache *regcache, char *buf)
-{
-#define lynx_i386_collect_gp(regnum, fld) \
-  collect_register (regcache, regnum, \
-                    buf + offsetof (usr_econtext_t, uec_##fld))
-
-  lynx_i386_collect_gp (I386_EAX_REGNUM, eax);
-  lynx_i386_collect_gp (I386_ECX_REGNUM, ecx);
-  lynx_i386_collect_gp (I386_EDX_REGNUM, edx);
-  lynx_i386_collect_gp (I386_EBX_REGNUM, ebx);
-  lynx_i386_collect_gp (I386_ESP_REGNUM, esp);
-  lynx_i386_collect_gp (I386_EBP_REGNUM, ebp);
-  lynx_i386_collect_gp (I386_ESI_REGNUM, esi);
-  lynx_i386_collect_gp (I386_EDI_REGNUM, edi);
-  lynx_i386_collect_gp (I386_EIP_REGNUM, eip);
-  lynx_i386_collect_gp (I386_EFLAGS_REGNUM, eflags);
-  lynx_i386_collect_gp (I386_CS_REGNUM, cs);
-  lynx_i386_collect_gp (I386_SS_REGNUM, ss);
-  lynx_i386_collect_gp (I386_DS_REGNUM, ds);
-  lynx_i386_collect_gp (I386_ES_REGNUM, es);
-  lynx_i386_collect_gp (I386_FS_REGNUM, fs);
-  lynx_i386_collect_gp (I386_GS_REGNUM, gs);
-}
-
-/* The store_function for the general-purpose register set.  */
-
-static void
-lynx_i386_store_gregset (struct regcache *regcache, const char *buf)
-{
-#define lynx_i386_supply_gp(regnum, fld) \
-  supply_register (regcache, regnum, \
-                   buf + offsetof (usr_econtext_t, uec_##fld))
-
-  lynx_i386_supply_gp (I386_EAX_REGNUM, eax);
-  lynx_i386_supply_gp (I386_ECX_REGNUM, ecx);
-  lynx_i386_supply_gp (I386_EDX_REGNUM, edx);
-  lynx_i386_supply_gp (I386_EBX_REGNUM, ebx);
-  lynx_i386_supply_gp (I386_ESP_REGNUM, esp);
-  lynx_i386_supply_gp (I386_EBP_REGNUM, ebp);
-  lynx_i386_supply_gp (I386_ESI_REGNUM, esi);
-  lynx_i386_supply_gp (I386_EDI_REGNUM, edi);
-  lynx_i386_supply_gp (I386_EIP_REGNUM, eip);
-  lynx_i386_supply_gp (I386_EFLAGS_REGNUM, eflags);
-  lynx_i386_supply_gp (I386_CS_REGNUM, cs);
-  lynx_i386_supply_gp (I386_SS_REGNUM, ss);
-  lynx_i386_supply_gp (I386_DS_REGNUM, ds);
-  lynx_i386_supply_gp (I386_ES_REGNUM, es);
-  lynx_i386_supply_gp (I386_FS_REGNUM, fs);
-  lynx_i386_supply_gp (I386_GS_REGNUM, gs);
-}
-
-/* Extract the first 16 bits of register REGNUM in the REGCACHE,
-   and store these 2 bytes at DEST.
-
-   This is useful to collect certain 16bit registers which are known
-   by GDBserver as 32bit registers (such as the Control Register
-   for instance).  */
-
-static void
-collect_16bit_register (struct regcache *regcache, int regnum, char *dest)
-{
-  gdb_byte word[4];
-
-  collect_register (regcache, regnum, word);
-  memcpy (dest, word, 2);
-}
-
-/* The fill_function for the floating-point register set.  */
-
-static void
-lynx_i386_fill_fpregset (struct regcache *regcache, char *buf)
-{
-  int i;
-
-  /* Collect %st0 .. %st7.  */
-  for (i = 0; i < 8; i++)
-    collect_register (regcache, I386_ST0_REGNUM + i,
-                      buf + offsetof (usr_fcontext_t, ufc_reg)
-		      + i * sizeof (struct ufp387_real));
-
-  /* Collect the other FPU registers.  */
-  collect_16bit_register (regcache, I386_FCTRL_REGNUM,
-                          buf + offsetof (usr_fcontext_t, ufc_control));
-  collect_16bit_register (regcache, I386_FSTAT_REGNUM,
-                          buf + offsetof (usr_fcontext_t, ufc_status));
-  collect_16bit_register (regcache, I386_FTAG_REGNUM,
-                          buf + offsetof (usr_fcontext_t, ufc_tag));
-  collect_register (regcache, I386_FISEG_REGNUM,
-                    buf + offsetof (usr_fcontext_t, ufc_inst_sel));
-  collect_register (regcache, I386_FIOFF_REGNUM,
-                    buf + offsetof (usr_fcontext_t, ufc_inst_off));
-  collect_register (regcache, I386_FOSEG_REGNUM,
-                    buf + offsetof (usr_fcontext_t, ufc_data_sel));
-  collect_register (regcache, I386_FOOFF_REGNUM,
-                    buf + offsetof (usr_fcontext_t, ufc_data_off));
-#if !defined(LYNXOS_178)
-  collect_16bit_register (regcache, I386_FOP_REGNUM,
-                          buf + offsetof (usr_fcontext_t, ufc_opcode));
-
-  /* Collect the XMM registers.  */
-  for (i = 0; i < 8; i++)
-    collect_register (regcache, I386_XMM0_REGNUM + i,
-                      buf + offsetof (usr_fcontext_t, uxmm_reg)
-		      + i * sizeof (struct uxmm_register));
-  collect_register (regcache, I386_MXCSR_REGNUM,
-                    buf + offsetof (usr_fcontext_t, usse_mxcsr));
-#endif
-}
-
-/* This is the supply counterpart for collect_16bit_register:
-   It extracts a 2byte value from BUF, and uses that value to
-   set REGNUM's value in the regcache.
-
-   This is useful to supply the value of certain 16bit registers
-   which are known by GDBserver as 32bit registers (such as the Control
-   Register for instance).  */
-
-static void
-supply_16bit_register (struct regcache *regcache, int regnum, const char *buf)
-{
-  gdb_byte word[4];
-
-  memcpy (word, buf, 2);
-  memset (word + 2, 0, 2);
-  supply_register (regcache, regnum, word);
-}
-
-/* The store_function for the floating-point register set.  */
-
-static void
-lynx_i386_store_fpregset (struct regcache *regcache, const char *buf)
-{
-  int i;
-
-  /* Store the %st0 .. %st7 registers.  */
-  for (i = 0; i < 8; i++)
-    supply_register (regcache, I386_ST0_REGNUM + i,
-                     buf + offsetof (usr_fcontext_t, ufc_reg)
-		     + i * sizeof (struct ufp387_real));
-
-  /* Store the other FPU registers.  */
-  supply_16bit_register (regcache, I386_FCTRL_REGNUM,
-                         buf + offsetof (usr_fcontext_t, ufc_control));
-  supply_16bit_register (regcache, I386_FSTAT_REGNUM,
-                         buf + offsetof (usr_fcontext_t, ufc_status));
-  supply_16bit_register (regcache, I386_FTAG_REGNUM,
-                         buf + offsetof (usr_fcontext_t, ufc_tag));
-  supply_register (regcache, I386_FISEG_REGNUM,
-                   buf + offsetof (usr_fcontext_t, ufc_inst_sel));
-  supply_register (regcache, I386_FIOFF_REGNUM,
-                   buf + offsetof (usr_fcontext_t, ufc_inst_off));
-  supply_register (regcache, I386_FOSEG_REGNUM,
-                   buf + offsetof (usr_fcontext_t, ufc_data_sel));
-  supply_register (regcache, I386_FOOFF_REGNUM,
-                   buf + offsetof (usr_fcontext_t, ufc_data_off));
-#if !defined(LYNXOS_178)
-  supply_16bit_register (regcache, I386_FOP_REGNUM,
-                         buf + offsetof (usr_fcontext_t, ufc_opcode));
-
-  /* Store the XMM registers.  */
-  for (i = 0; i < 8; i++)
-    supply_register (regcache, I386_XMM0_REGNUM + i,
-                     buf + offsetof (usr_fcontext_t, uxmm_reg)
-		     + i * sizeof (struct uxmm_register));
-  supply_register (regcache, I386_MXCSR_REGNUM,
-                   buf + offsetof (usr_fcontext_t, usse_mxcsr));
-#endif
-}
-
-/* Implements the lynx_target_ops.arch_setup routine.  */
-
-static void
-lynx_i386_arch_setup (void)
-{
-  struct target_desc *tdesc
-    = i386_create_target_description (X86_XSTATE_SSE_MASK, false, false);
-
-  init_target_desc (tdesc, i386_expedite_regs);
-
-  lynx_tdesc = tdesc;
-}
-
-/* Description of all the x86-lynx register sets.  */
-
-struct lynx_regset_info lynx_target_regsets[] = {
-  /* General Purpose Registers.  */
-  {PTRACE_GETREGS, PTRACE_SETREGS, sizeof(usr_econtext_t),
-   lynx_i386_fill_gregset, lynx_i386_store_gregset},
-  /* Floating Point Registers.  */
-  { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof(usr_fcontext_t),
-    lynx_i386_fill_fpregset, lynx_i386_store_fpregset },
-  /* End of list marker.  */
-  {0, 0, -1, NULL, NULL }
-};
-
-/* The lynx_target_ops vector for x86-lynx.  */
-
-struct lynx_target_ops the_low_target = {
-  lynx_i386_arch_setup,
-};