Delete IRIX support

This does most of the mechanical removal.  IOW, the easy part.

This doesn't touch procfs.c as that'd be a harder excision,
potentially affecting Solaris.

mips-tdep.c is left alone.  E.g., I didn't delete the GDB_OSABI_IRIX
enum value, nor references to it in mips-tdep.c.  Some comments
mentioning IRIX ABIs may still be relevant and I wouldn't know what to
do with them. in That can always be done on a separate pass,
preferably by someone who can test on MIPS.

I didn't remove a reference to IRIX in testsuite/lib/future.exp, as I
believe that code is imported from DejaGNU.

Built and tested on x86_64 Fedora 20, with --enable-targets=all.

Tested that building for --target=mips-sgi-irix6 on x86_64 Fedora 20
fails with:

 checking for default auto-load directory... $debugdir:$datadir/auto-load
 checking for default auto-load safe-path... $debugdir:$datadir/auto-load
 *** Configuration mips-sgi-irix6 is obsolete.
 *** Support has been REMOVED.
 make[1]: *** [configure-gdb] Error 1
 make[1]: Leaving directory `/home/pedro/gdb/mygit/build-irix'
 make: *** [all] Error 2

gdb/
2014-10-10  Pedro Alves  <palves@redhat.com>

	* Makefile.in (ALL_TARGET_OBS): Remove mips-irix-tdep.o and solib-irix.o.
	(ALLDEPFILES): Remove mips-irix-tdep.c and solib-irix.c.
	(HFILES_NO_SRCDIR): Remove solib-irix.h.
	* NEWS: Mention that support for mips-sgi-irix5* mips-sgi-irix6*
	and been removed.
	* config/mips/irix5.mh, config/mips/irix6.mh: Delete files.
	* configure.ac: Remove references to IRIX.
	* configure.host: Add *-*-irix* to the obsolete hosts section.
	Remove all other references to irix.
	* irix5-nat.c, mips-irix-tdep.c, solib-irix.c, solib-irix.h:
	Delete files.

gdb/testsuite/
2014-10-10  Pedro Alves  <palves@redhat.com>

	* gdb.base/bigcore.exp: Remove references to IRIX.
	* gdb.base/funcargs.exp: Likewise.
	* gdb.base/interrupt.exp: Likewise.
	* gdb.base/mips_pro.exp: Likewise.
	* gdb.base/nodebug.exp: Likewise.
	* gdb.base/setvar.exp: Likewise.
	* lib/gdb.exp (gdb_compile_shlib): Remove mips-sgi-irix* case.

1 files changed, 0 insertions, 294 deletions

diff --git a/gdb/mips-irix-tdep.c b/gdb/mips-irix-tdep.c
deleted file mode 100644
index 1232be8..0000000
--- a/gdb/mips-irix-tdep.c
+++ /dev/null
@@ -1,294 +0,0 @@
-/* Target-dependent code for the MIPS architecture running on IRIX,
-   for GDB, the GNU Debugger.
-
-   Copyright (C) 2002-2014 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 "defs.h"
-#include "osabi.h"
-#include "solib.h"
-#include "solib-irix.h"
-#include "elf-bfd.h"
-#include "mips-tdep.h"
-#include "trad-frame.h"
-#include "tramp-frame.h"
-
-static void
-mips_irix_elf_osabi_sniff_abi_tag_sections (bfd *abfd, asection *sect,
-                                            void *obj)
-{
-  enum gdb_osabi *os_ident_ptr = obj;
-  const char *name;
-  unsigned int sectsize;
-
-  name = bfd_get_section_name (abfd, sect);
-  sectsize = bfd_section_size (abfd, sect);
-
-  /* The presence of a section named with a ".MIPS." prefix is usually
-     indicative of an IRIX binary, however there are exceptions that
-     are present universally, so check for those names and avoid
-     switching away from the default OS ABI in the case of a match.  */
-  if (strncmp (name, ".MIPS.", 6) == 0
-      && strcmp (name, ".MIPS.abiflags") != 0
-      && strcmp (name, ".MIPS.options") != 0
-      && strcmp (name, ".MIPS.stubs") != 0
-      && sectsize > 0)
-    *os_ident_ptr = GDB_OSABI_IRIX;
-}
-
-static enum gdb_osabi
-mips_irix_elf_osabi_sniffer (bfd *abfd)
-{
-  unsigned int elfosabi;
-  enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
-
-  /* If the generic sniffer gets a hit, return and let other sniffers
-     get a crack at it.  */
-  bfd_map_over_sections (abfd,
-			 generic_elf_osabi_sniff_abi_tag_sections,
-			 &osabi);
-  if (osabi != GDB_OSABI_UNKNOWN)
-    return GDB_OSABI_UNKNOWN;
-
-  elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI];
-
-  if (elfosabi == ELFOSABI_NONE)
-    {
-      /* When elfosabi is ELFOSABI_NONE (0), then the ELF structures in the
-	 file are conforming to the base specification for that machine 
-	 (there are no OS-specific extensions).  In order to determine the 
-	 real OS in use we must look for OS notes that have been added.
-	 
-	 For IRIX, we simply look for sections named with .MIPS. as
-	 prefixes.  */
-      bfd_map_over_sections (abfd,
-			     mips_irix_elf_osabi_sniff_abi_tag_sections, 
-			     &osabi);
-    }
-  return osabi;
-}
-
-/* Unwinding past the signal handler on mips-irix.
-
-   Note: The following has only been tested with N32, but can probably
-         be made to work with a small number of adjustments.
-
-   On mips-irix, the sigcontext_t structure is stored at the base
-   of the frame established by the _sigtramp function.  The definition
-   of this structure can be found in <sys/signal.h> (comments have been
-   C++'ified to avoid a collision with the C-style comment delimiters
-   used by this comment):
-
-      typedef struct sigcontext {
-        __uint32_t      sc_regmask;     // regs to restore in sigcleanup
-        __uint32_t      sc_status;      // cp0 status register
-        __uint64_t      sc_pc;          // pc at time of signal
-        // General purpose registers
-        __uint64_t      sc_regs[32];    // processor regs 0 to 31
-        // Floating point coprocessor state
-        __uint64_t      sc_fpregs[32];  // fp regs 0 to 31
-        __uint32_t      sc_ownedfp;     // fp has been used
-        __uint32_t      sc_fpc_csr;     // fpu control and status reg
-        __uint32_t      sc_fpc_eir;     // fpu exception instruction reg
-                                        // implementation/revision
-        __uint32_t      sc_ssflags;     // signal stack state to restore
-        __uint64_t      sc_mdhi;        // Multiplier hi and low regs
-        __uint64_t      sc_mdlo;
-        // System coprocessor registers at time of signal
-        __uint64_t      sc_cause;       // cp0 cause register
-        __uint64_t      sc_badvaddr;    // cp0 bad virtual address
-        __uint64_t      sc_triggersave; // state of graphics trigger (SGI)
-        sigset_t        sc_sigset;      // signal mask to restore
-        __uint64_t      sc_fp_rounded_result;   // for Ieee 754 support
-        __uint64_t      sc_pad[31];
-      } sigcontext_t;
-
-   The following macros provide the offset of some of the fields
-   used to retrieve the value of the registers before the signal
-   was raised.  */
-
-/* The size of the sigtramp frame.  The sigtramp frame base can then
-   be computed by adding this size to the SP.  */
-#define SIGTRAMP_FRAME_SIZE 48
-/* The offset in sigcontext_t where the PC is saved.  */
-#define SIGCONTEXT_PC_OFF 8
-/* The offset in sigcontext_t where the GP registers are saved.  */
-#define SIGCONTEXT_REGS_OFF (SIGCONTEXT_PC_OFF + 8)
-/* The offset in sigcontext_t where the FP regsiters are saved.  */
-#define SIGCONTEXT_FPREGS_OFF (SIGCONTEXT_REGS_OFF + 32 * 8)
-/* The offset in sigcontext_t where the FP CSR register is saved.  */
-#define SIGCONTEXT_FPCSR_OFF (SIGCONTEXT_FPREGS_OFF + 32 * 8 + 4)
-/* The offset in sigcontext_t where the multiplier hi register is saved.  */
-#define SIGCONTEXT_HI_OFF (SIGCONTEXT_FPCSR_OFF + 2 * 4)
-/* The offset in sigcontext_t where the multiplier lo register is saved.  */
-#define SIGCONTEXT_LO_OFF (SIGCONTEXT_HI_OFF + 4)
-
-/* Implement the "init" routine in struct tramp_frame for the N32 ABI
-   on mips-irix.  */
-static void
-mips_irix_n32_tramp_frame_init (const struct tramp_frame *self,
-				struct frame_info *this_frame,
-				struct trad_frame_cache *this_cache,
-				CORE_ADDR func)
-{
-  struct gdbarch *gdbarch = get_frame_arch (this_frame);
-  const int num_regs = gdbarch_num_regs (gdbarch);
-  int sp_cooked_regno = num_regs + MIPS_SP_REGNUM;
-  const CORE_ADDR sp = get_frame_register_signed (this_frame, sp_cooked_regno);
-  const CORE_ADDR sigcontext_base = sp + 48;
-  const struct mips_regnum *regs = mips_regnum (gdbarch);
-  int ireg;
-
-  trad_frame_set_reg_addr (this_cache, regs->pc + gdbarch_num_regs (gdbarch),
-                           sigcontext_base + SIGCONTEXT_PC_OFF);
-
-  for (ireg = 1; ireg < 32; ireg++)
-    trad_frame_set_reg_addr (this_cache, ireg + MIPS_ZERO_REGNUM + num_regs,
-                             sigcontext_base + SIGCONTEXT_REGS_OFF + ireg * 8);
-
-  for (ireg = 0; ireg < 32; ireg++)
-    trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + num_regs,
-                             sigcontext_base + SIGCONTEXT_FPREGS_OFF
-                               + ireg * 8);
-
-  trad_frame_set_reg_addr (this_cache, regs->fp_control_status + num_regs,
-                           sigcontext_base + SIGCONTEXT_FPCSR_OFF);
-
-  trad_frame_set_reg_addr (this_cache, regs->hi + num_regs,
-                           sigcontext_base + SIGCONTEXT_HI_OFF);
-
-  trad_frame_set_reg_addr (this_cache, regs->lo + num_regs,
-                           sigcontext_base + SIGCONTEXT_LO_OFF);
-
-  trad_frame_set_id (this_cache, frame_id_build (sigcontext_base, func));
-}
-
-/* The tramp_frame structure describing sigtramp frames on mips-irix N32.
-
-   Note that the list of instructions below is pretty much a pure dump
-   of function _sigtramp on mips-irix.  A few instructions are actually
-   not tested (mask set to 0), because a portion of these instructions
-   contain an address which changes due to relocation.  We could use
-   a smarter mask that checks the instrutction code alone, but given
-   the number of instructions already being checked, this seemed
-   unnecessary.  */
-
-static const struct tramp_frame mips_irix_n32_tramp_frame =
-{
-  SIGTRAMP_FRAME,
-  4,
-  {
-   { 0x3c0c8000, -1 }, /*    lui     t0,0x8000 */
-   { 0x27bdffd0, -1 }, /*    addiu   sp,sp,-48 */
-   { 0x008c6024, -1 }, /*    and     t0,a0,t0 */
-   { 0xffa40018, -1 }, /*    sd      a0,24(sp) */
-   { 0x00000000,  0 }, /*    beqz    t0,0xfaefcb8 <_sigtramp+40> */
-   { 0xffa60028, -1 }, /*    sd      a2,40(sp) */
-   { 0x01806027, -1 }, /*    nor     t0,t0,zero */
-   { 0xffa00020, -1 }, /*    sd      zero,32(sp) */
-   { 0x00000000,  0 }, /*    b       0xfaefcbc <_sigtramp+44> */
-   { 0x008c2024, -1 }, /*    and     a0,a0,t0 */
-   { 0xffa60020, -1 }, /*    sd      a2,32(sp) */
-   { 0x03e0c025, -1 }, /*    move    t8,ra */
-   { 0x00000000,  0 }, /*    bal     0xfaefcc8 <_sigtramp+56> */
-   { 0x00000000, -1 }, /*    nop */
-   { 0x3c0c0007, -1 }, /*    lui     t0,0x7 */
-   { 0x00e0c825, -1 }, /*    move    t9,a3 */
-   { 0x658c80fc, -1 }, /*    daddiu  t0,t0,-32516 */
-   { 0x019f602d, -1 }, /*    daddu   t0,t0,ra */
-   { 0x0300f825, -1 }, /*    move    ra,t8 */
-   { 0x8d8c9880, -1 }, /*    lw      t0,-26496(t0) */
-   { 0x8d8c0000, -1 }, /*    lw      t0,0(t0) */
-   { 0x8d8d0000, -1 }, /*    lw      t1,0(t0) */
-   { 0xffac0008, -1 }, /*    sd      t0,8(sp) */
-   { 0x0320f809, -1 }, /*    jalr    t9 */
-   { 0xffad0010, -1 }, /*    sd      t1,16(sp) */
-   { 0xdfad0010, -1 }, /*    ld      t1,16(sp) */
-   { 0xdfac0008, -1 }, /*    ld      t0,8(sp) */
-   { 0xad8d0000, -1 }, /*    sw      t1,0(t0) */
-   { 0xdfa40020, -1 }, /*    ld      a0,32(sp) */
-   { 0xdfa50028, -1 }, /*    ld      a1,40(sp) */
-   { 0xdfa60018, -1 }, /*    ld      a2,24(sp) */
-   { 0x24020440, -1 }, /*    li      v0,1088 */
-   { 0x0000000c, -1 }, /*    syscall */
-   { TRAMP_SENTINEL_INSN, -1 }
-  },
-  mips_irix_n32_tramp_frame_init
-};
-
-/* Implement the "init" routine in struct tramp_frame for the stack-based
-   trampolines used on mips-irix.  */
-
-static void
-mips_irix_n32_stack_tramp_frame_init (const struct tramp_frame *self,
-				      struct frame_info *this_frame,
-				      struct trad_frame_cache *this_cache,
-				      CORE_ADDR func)
-{
-  struct gdbarch *gdbarch = get_frame_arch (this_frame);
-  const int num_regs = gdbarch_num_regs (gdbarch);
-  int sp_cooked_regno = num_regs + MIPS_SP_REGNUM;
-  const CORE_ADDR sp = get_frame_register_signed (this_frame, sp_cooked_regno);
-
-  /* The previous frame's PC is stored in RA.  */
-  trad_frame_set_reg_realreg (this_cache, gdbarch_pc_regnum (gdbarch),
-                              num_regs + MIPS_RA_REGNUM);
-
-  trad_frame_set_id (this_cache, frame_id_build (sp, func));
-}
-
-/* A tramp_frame structure describing the stack-based trampoline
-   used on mips-irix.  These trampolines are created on the stack
-   before being called.  */
-
-static const struct tramp_frame mips_irix_n32_stack_tramp_frame =
-{
-  SIGTRAMP_FRAME,
-  4,
-  {
-   { 0x8f210000, 0xffff0000 },  /* lw     at, N(t9) */
-   { 0x8f2f0000, 0xffff0000 },  /* lw     t3, M(t9) */
-   { 0x00200008, 0xffffffff },  /* jr     at        */
-   { 0x0020c82d, 0xffffffff },  /* move   t9, at    */
-   { TRAMP_SENTINEL_INSN, -1 }
-  },
-  mips_irix_n32_stack_tramp_frame_init
-};
-
-static void
-mips_irix_init_abi (struct gdbarch_info info,
-                    struct gdbarch *gdbarch)
-{
-  set_solib_ops (gdbarch, &irix_so_ops);
-  tramp_frame_prepend_unwinder (gdbarch, &mips_irix_n32_stack_tramp_frame);
-  tramp_frame_prepend_unwinder (gdbarch, &mips_irix_n32_tramp_frame);
-}
-
-/* Provide a prototype to silence -Wmissing-prototypes.  */
-extern initialize_file_ftype _initialize_mips_irix_tdep;
-
-void
-_initialize_mips_irix_tdep (void)
-{
-  /* Register an ELF OS ABI sniffer for IRIX binaries.  */
-  gdbarch_register_osabi_sniffer (bfd_arch_mips,
-				  bfd_target_elf_flavour,
-				  mips_irix_elf_osabi_sniffer);
-
-  gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_IRIX,
-			  mips_irix_init_abi);
-}