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/* Target-dependent code for GNU/Linux on Tilera TILE-Gx processors.
Copyright 2012 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 "linux-tdep.h"
#include "glibc-tdep.h"
#include "solib-svr4.h"
#include "symtab.h"
#include "regcache.h"
#include "regset.h"
#include "tramp-frame.h"
#include "trad-frame.h"
#include "tilegx-tdep.h"
/* Signal trampoline support. */
static void
tilegx_linux_sigframe_init (const struct tramp_frame *self,
struct frame_info *this_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func)
{
CORE_ADDR pc = get_frame_register_unsigned (this_frame, 64);
CORE_ADDR sp = get_frame_register_unsigned (this_frame, 54);
/* Base address of register save area. */
CORE_ADDR base = sp
+ 16 /* Skip ABI_SAVE_AREA. */
+ 128 /* Skip SIGINFO. */
+ 40; /* Skip UCONTEXT. */
/* Address of saved LR register (R56) which holds previous PC. */
CORE_ADDR prev_pc = base + 56 * 8;
int i;
for (i = 0; i < 56; i++)
trad_frame_set_reg_addr (this_cache, i, base + i * 8);
trad_frame_set_reg_value (this_cache, 64,
get_frame_memory_unsigned (this_frame, prev_pc, 8));
/* Save a frame ID. */
trad_frame_set_id (this_cache, frame_id_build (base, func));
}
static const struct tramp_frame tilegx_linux_rt_sigframe =
{
SIGTRAMP_FRAME,
8,
{
{ 0x00045fe551483000ULL, -1 }, /* { moveli r10, 139 } */
{ 0x286b180051485000ULL, -1 }, /* { swint1 } */
{ TRAMP_SENTINEL_INSN, -1 }
},
tilegx_linux_sigframe_init
};
/* Supply raw registers from REGCACHE to REGS. */
static void
tilegx_linux_supply_regset (const struct regset *regset,
struct regcache *regcache,
int regnum, const void *regs, size_t len)
{
struct gdbarch *arch = get_regcache_arch (regcache);
const char *ptr = regs;
int i;
/* This logic must match that of struct pt_regs in "ptrace.h". */
for (i = 0; i < TILEGX_NUM_EASY_REGS + 1; i++, ptr += tilegx_reg_size)
{
int gri = (i < TILEGX_NUM_EASY_REGS) ? i : TILEGX_PC_REGNUM;
if (regnum == gri || regnum == -1)
regcache_raw_supply (regcache, gri, ptr);
}
}
/* TILE-Gx Linux kernel register set. */
static struct regset tilegx_linux_regset =
{
NULL,
tilegx_linux_supply_regset
};
static const struct regset *
tilegx_regset_from_core_section (struct gdbarch *gdbarch,
const char *sect_name,
size_t sect_size)
{
if (strcmp (sect_name, ".reg") == 0)
return &tilegx_linux_regset;
return NULL;
}
/* OS specific initialization of gdbarch. */
static void
tilegx_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
int arch_size = gdbarch_addr_bit (gdbarch);
linux_init_abi (info, gdbarch);
tramp_frame_prepend_unwinder (gdbarch, &tilegx_linux_rt_sigframe);
set_gdbarch_regset_from_core_section (gdbarch,
tilegx_regset_from_core_section);
/* GNU/Linux uses SVR4-style shared libraries. */
if (arch_size == 32)
set_solib_svr4_fetch_link_map_offsets (gdbarch,
svr4_ilp32_fetch_link_map_offsets);
else
set_solib_svr4_fetch_link_map_offsets (gdbarch,
svr4_lp64_fetch_link_map_offsets);
/* Enable TLS support. */
set_gdbarch_fetch_tls_load_module_address (gdbarch,
svr4_fetch_objfile_link_map);
/* Shared library handling. */
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
set_gdbarch_get_siginfo_type (gdbarch, linux_get_siginfo_type);
}
/* Provide a prototype to silence -Wmissing-prototypes. */
extern initialize_file_ftype _initialize_tilegx_linux_tdep;
void
_initialize_tilegx_linux_tdep (void)
{
gdbarch_register_osabi (bfd_arch_tilegx, bfd_mach_tilegx, GDB_OSABI_LINUX,
tilegx_linux_init_abi);
}
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