0b76b0cedb
gdb/ * nios2-tdep.c (nios2_reg_names): Use "sstatus" rather than "ba" as the preferred name of r30. * nios2-linux-tdep.c (reg_offsets): Likewise. * features/nios2-cpu.xml: Likewise. * features/nios2-linux.c: Regenerated. * features/nios2.c: Regenerated. * regformats/nios2-linux.dat: Regenerated.
233 lines
7.3 KiB
C
233 lines
7.3 KiB
C
/* Target-dependent code for GNU/Linux on Nios II.
|
|
Copyright (C) 2012-2013 Free Software Foundation, Inc.
|
|
Contributed by Mentor Graphics, 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 "frame.h"
|
|
#include "gdb_assert.h"
|
|
#include "gdb_string.h"
|
|
#include "osabi.h"
|
|
#include "solib-svr4.h"
|
|
#include "trad-frame.h"
|
|
#include "tramp-frame.h"
|
|
#include "symtab.h"
|
|
#include "regset.h"
|
|
#include "regcache.h"
|
|
#include "linux-tdep.h"
|
|
#include "glibc-tdep.h"
|
|
#include "nios2-tdep.h"
|
|
|
|
#include "features/nios2-linux.c"
|
|
|
|
/* Core file and register set support. */
|
|
|
|
/* Map from the normal register enumeration order to the order that
|
|
registers appear in core files, which corresponds to the order
|
|
of the register slots in the kernel's struct pt_regs. */
|
|
|
|
static const int reg_offsets[NIOS2_NUM_REGS] =
|
|
{
|
|
-1, 8, 9, 10, 11, 12, 13, 14, /* r0 - r7 */
|
|
0, 1, 2, 3, 4, 5, 6, 7, /* r8 - r15 */
|
|
23, 24, 25, 26, 27, 28, 29, 30, /* r16 - r23 */
|
|
-1, -1, 19, 18, 17, 21, -1, 16, /* et bt gp sp fp ea sstatus ra */
|
|
21, /* pc */
|
|
-1, 20, -1, -1, -1, -1, -1, -1, /* status estatus ... */
|
|
-1, -1, -1, -1, -1, -1, -1, -1
|
|
};
|
|
|
|
/* Implement the supply_regset hook for core files. */
|
|
|
|
static void
|
|
nios2_supply_gregset (const struct regset *regset,
|
|
struct regcache *regcache,
|
|
int regnum, const void *gregs_buf, size_t len)
|
|
{
|
|
const gdb_byte *gregs = gregs_buf;
|
|
int regno;
|
|
static const gdb_byte zero_buf[4] = {0, 0, 0, 0};
|
|
|
|
for (regno = NIOS2_Z_REGNUM; regno <= NIOS2_MPUACC_REGNUM; regno++)
|
|
if (regnum == -1 || regnum == regno)
|
|
{
|
|
if (reg_offsets[regno] != -1)
|
|
regcache_raw_supply (regcache, regno,
|
|
gregs + 4 * reg_offsets[regno]);
|
|
else
|
|
regcache_raw_supply (regcache, regno, zero_buf);
|
|
}
|
|
}
|
|
|
|
static struct regset nios2_core_regset =
|
|
{
|
|
NULL,
|
|
nios2_supply_gregset,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
/* Implement the regset_from_core_section gdbarch method. */
|
|
|
|
static const struct regset *
|
|
nios2_regset_from_core_section (struct gdbarch *gdbarch,
|
|
const char *sect_name, size_t sect_size)
|
|
{
|
|
if (strcmp (sect_name, ".reg") == 0)
|
|
return &nios2_core_regset;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Initialize a trad-frame cache corresponding to the tramp-frame.
|
|
FUNC is the address of the instruction TRAMP[0] in memory. */
|
|
|
|
static void
|
|
nios2_linux_sigreturn_init (const struct tramp_frame *self,
|
|
struct frame_info *next_frame,
|
|
struct trad_frame_cache *this_cache,
|
|
CORE_ADDR func)
|
|
{
|
|
CORE_ADDR base = func + 16;
|
|
int i;
|
|
|
|
for (i = 0; i < 8; i++)
|
|
trad_frame_set_reg_addr (this_cache, i + 8, base + i * 4);
|
|
for (i = 0; i < 7; i++)
|
|
trad_frame_set_reg_addr (this_cache, i + 1, base + (i + 8) * 4);
|
|
trad_frame_set_reg_addr (this_cache, NIOS2_RA_REGNUM, base + 16 * 4);
|
|
trad_frame_set_reg_addr (this_cache, NIOS2_FP_REGNUM, base + 17 * 4);
|
|
trad_frame_set_reg_addr (this_cache, NIOS2_SP_REGNUM, base + 18 * 4);
|
|
trad_frame_set_reg_addr (this_cache, NIOS2_GP_REGNUM, base + 19 * 4);
|
|
trad_frame_set_reg_addr (this_cache, NIOS2_ESTATUS_REGNUM, base + 20 * 4);
|
|
trad_frame_set_reg_addr (this_cache, NIOS2_PC_REGNUM, base + 21 * 4);
|
|
|
|
/* Save a frame ID. */
|
|
trad_frame_set_id (this_cache, frame_id_build (base, func));
|
|
}
|
|
|
|
/* Initialize a trad-frame cache corresponding to the tramp-frame.
|
|
FUNC is the address of the instruction TRAMP[0] in memory. */
|
|
|
|
static void
|
|
nios2_linux_rt_sigreturn_init (const struct tramp_frame *self,
|
|
struct frame_info *next_frame,
|
|
struct trad_frame_cache *this_cache,
|
|
CORE_ADDR func)
|
|
{
|
|
CORE_ADDR base = func + 41 * 4;
|
|
int i;
|
|
|
|
for (i = 0; i < 23; i++)
|
|
trad_frame_set_reg_addr (this_cache, i + 1, base + i * 4);
|
|
trad_frame_set_reg_addr (this_cache, NIOS2_RA_REGNUM, base + 23 * 4);
|
|
trad_frame_set_reg_addr (this_cache, NIOS2_FP_REGNUM, base + 24 * 4);
|
|
trad_frame_set_reg_addr (this_cache, NIOS2_GP_REGNUM, base + 25 * 4);
|
|
trad_frame_set_reg_addr (this_cache, NIOS2_PC_REGNUM, base + 27 * 4);
|
|
trad_frame_set_reg_addr (this_cache, NIOS2_SP_REGNUM, base + 28 * 4);
|
|
|
|
/* Save a frame ID. */
|
|
trad_frame_set_id (this_cache, frame_id_build (base, func));
|
|
}
|
|
|
|
static struct tramp_frame nios2_linux_sigreturn_tramp_frame =
|
|
{
|
|
SIGTRAMP_FRAME,
|
|
4,
|
|
{
|
|
{ 0x00800004 | (119 << 6), -1 }, /* movi r2,__NR_sigreturn */
|
|
{ 0x003b683a, -1 }, /* trap */
|
|
{ TRAMP_SENTINEL_INSN }
|
|
},
|
|
nios2_linux_sigreturn_init
|
|
};
|
|
|
|
static struct tramp_frame nios2_linux_rt_sigreturn_tramp_frame =
|
|
{
|
|
SIGTRAMP_FRAME,
|
|
4,
|
|
{
|
|
{ 0x00800004 | (173 << 6), -1 }, /* movi r2,__NR_rt_sigreturn */
|
|
{ 0x003b683a, -1 }, /* trap */
|
|
{ TRAMP_SENTINEL_INSN }
|
|
},
|
|
nios2_linux_rt_sigreturn_init
|
|
};
|
|
|
|
/* When FRAME is at a syscall instruction, return the PC of the next
|
|
instruction to be executed. */
|
|
|
|
static CORE_ADDR
|
|
nios2_linux_syscall_next_pc (struct frame_info *frame)
|
|
{
|
|
CORE_ADDR pc = get_frame_pc (frame);
|
|
ULONGEST syscall_nr = get_frame_register_unsigned (frame, NIOS2_R2_REGNUM);
|
|
|
|
/* If we are about to make a sigreturn syscall, use the unwinder to
|
|
decode the signal frame. */
|
|
if (syscall_nr == 119 /* sigreturn */
|
|
|| syscall_nr == 173 /* rt_sigreturn */)
|
|
return frame_unwind_caller_pc (frame);
|
|
|
|
return pc + NIOS2_OPCODE_SIZE;
|
|
}
|
|
|
|
/* Hook function for gdbarch_register_osabi. */
|
|
|
|
static void
|
|
nios2_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
|
|
linux_init_abi (info, gdbarch);
|
|
|
|
/* Shared library handling. */
|
|
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
|
|
set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
|
|
|
|
set_solib_svr4_fetch_link_map_offsets (gdbarch,
|
|
svr4_ilp32_fetch_link_map_offsets);
|
|
/* Enable TLS support. */
|
|
set_gdbarch_fetch_tls_load_module_address (gdbarch,
|
|
svr4_fetch_objfile_link_map);
|
|
/* Core file support. */
|
|
set_gdbarch_regset_from_core_section (gdbarch,
|
|
nios2_regset_from_core_section);
|
|
/* Linux signal frame unwinders. */
|
|
tramp_frame_prepend_unwinder (gdbarch,
|
|
&nios2_linux_sigreturn_tramp_frame);
|
|
tramp_frame_prepend_unwinder (gdbarch,
|
|
&nios2_linux_rt_sigreturn_tramp_frame);
|
|
|
|
tdep->syscall_next_pc = nios2_linux_syscall_next_pc;
|
|
|
|
/* Index of target address word in glibc jmp_buf. */
|
|
tdep->jb_pc = 10;
|
|
}
|
|
|
|
/* Provide a prototype to silence -Wmissing-prototypes. */
|
|
|
|
extern initialize_file_ftype _initialize_nios2_linux_tdep;
|
|
|
|
void
|
|
_initialize_nios2_linux_tdep (void)
|
|
{
|
|
gdbarch_register_osabi (bfd_arch_nios2, 0, GDB_OSABI_LINUX,
|
|
nios2_linux_init_abi);
|
|
|
|
initialize_tdesc_nios2_linux ();
|
|
}
|