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arc: Add support for Newlib

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Add support for Newlib as an OS/ABI.  The only thing that is specific to it
relatively to "generic" baremetal target is location of PC register in jump
buffer for longjump support.

Sniffer uses .ivt section to decide if ELF file is for ARC Newlib or not.

gdb/ChangeLog:

	* arc-newlib-tdep.c: New file.
	* configure.tgt: Add newlib support for ARC.
This commit is contained in:
Anton Kolesov 2016-10-12 14:36:44 +03:00
parent aaf43c4882
commit 4a2f482690
3 changed files with 80 additions and 1 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2016-10-12 Anton Kolesov <anton.kolesov@synopsys.com>
* arc-newlib-tdep.c: New file.
* configure.tgt: Add newlib support for ARC.
2016-10-12 Anton Kolesov <anton.kolesov@synopsys.com>
* arc-tdep.h (struct gdbarch_tdep) <jb_pc>: New field.

69
gdb/arc-newlib-tdep.c Normal file
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@ -0,0 +1,69 @@
/* Target-dependent code for Newlib ARC.
Copyright (C) 2016 Free Software Foundation, Inc.
Contributed by Synopsys 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 "gdbarch.h"
#include "arc-tdep.h"
#include "osabi.h"
/* Implement the 'init_osabi' method of struct gdb_osabi_handler. */
static void
arc_newlib_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
if (arc_debug)
debug_printf ("arc-newlib: Initialization.\n");
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
/* Offset of original PC in longjmp jump buffer (in registers). Value of PC
offset can be found in newlib/libc/machine/arc/setjmp.S. */
tdep->jb_pc = 18;
}
/* Recognize ARC Newlib object files. */
static enum gdb_osabi
arc_newlib_osabi_sniffer (bfd *abfd)
{
if (arc_debug)
debug_printf ("arc-newlib: OS/ABI sniffer.\n");
/* crt0.S in libgloss for ARC defines .ivt section for interrupt handlers.
If this section is not present then this is likely not a newlib - could be
a Linux application or some non-newlib baremetal application. */
if (bfd_get_section_by_name (abfd, ".ivt") != NULL)
return GDB_OSABI_NEWLIB;
else
return GDB_OSABI_UNKNOWN;
}
/* Provide a prototype to silence -Wmissing-prototypes. */
extern initialize_file_ftype _initialize_arc_newlib_tdep;
void
_initialize_arc_newlib_tdep (void)
{
gdbarch_register_osabi_sniffer (bfd_arch_arc, bfd_target_elf_flavour,
arc_newlib_osabi_sniffer);
gdbarch_register_osabi (bfd_arch_arc, 0, GDB_OSABI_NEWLIB,
arc_newlib_init_osabi);
}

7
gdb/configure.tgt
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@ -83,8 +83,13 @@ am33_2.0*-*-linux*)
solib-svr4.o"
;;
arc*-*-elf32)
# Target: baremetal ARC elf32 (newlib) target
gdb_target_obs="arc-newlib-tdep.o arc-tdep.o"
;;
arc*-*-*)
# Target: baremetal ARC elf32 target
# Target: Unidentified ARC target
gdb_target_obs="arc-tdep.o"
;;