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/* Target-dependent code for GNU/Linux UltraSPARC.
Copyright (C) 2003, 2004, 2005, 2007, 2008 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 "frame.h"
#include "frame-unwind.h"
#include "dwarf2-frame.h"
#include "regset.h"
#include "regcache.h"
#include "gdbarch.h"
#include "gdbcore.h"
#include "osabi.h"
#include "solib-svr4.h"
#include "symtab.h"
#include "trad-frame.h"
#include "tramp-frame.h"
#include "sparc64-tdep.h"
/* Signal trampoline support. */
static void sparc64_linux_sigframe_init (const struct tramp_frame *self,
struct frame_info *next_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func);
/* See sparc-linux-tdep.c for details. Note that 64-bit binaries only
use RT signals. */
static const struct tramp_frame sparc64_linux_rt_sigframe =
{
SIGTRAMP_FRAME,
4,
{
{ 0x82102065, -1 }, /* mov __NR_rt_sigreturn, %g1 */
{ 0x91d0206d, -1 }, /* ta 0x6d */
{ TRAMP_SENTINEL_INSN, -1 }
},
sparc64_linux_sigframe_init
};
static void
sparc64_linux_sigframe_init (const struct tramp_frame *self,
struct frame_info *next_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func)
{
CORE_ADDR base, addr, sp_addr;
int regnum;
base = frame_unwind_register_unsigned (next_frame, SPARC_O1_REGNUM);
base += 128;
/* Offsets from <bits/sigcontext.h>. */
/* Since %g0 is always zero, keep the identity encoding. */
addr = base + 8;
sp_addr = base + ((SPARC_SP_REGNUM - SPARC_G0_REGNUM) * 8);
for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++)
{
trad_frame_set_reg_addr (this_cache, regnum, addr);
addr += 8;
}
trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0);
trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 8);
trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 16);
trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24);
trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28);
base = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
if (base & 1)
base += BIAS;
addr = get_frame_memory_unsigned (next_frame, sp_addr, 8);
if (addr & 1)
addr += BIAS;
for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
{
trad_frame_set_reg_addr (this_cache, regnum, addr);
addr += 8;
}
trad_frame_set_id (this_cache, frame_id_build (base, func));
}
/* Return the address of a system call's alternative return
address. */
static CORE_ADDR
sparc64_linux_step_trap (struct frame_info *frame, unsigned long insn)
{
if (insn == 0x91d0206d)
{
ULONGEST sp = get_frame_register_unsigned (frame, SPARC_SP_REGNUM);
if (sp & 1)
sp += BIAS;
/* The kernel puts the sigreturn registers on the stack,
and this is where the signal unwinding state is take from
when returning from a signal.
A siginfo_t sits 192 bytes from the base of the stack. This
siginfo_t is 128 bytes, and is followed by the sigreturn
register save area. The saved PC sits at a 136 byte offset
into there. */
return read_memory_unsigned_integer (sp + 192 + 128 + 136, 8);
}
return 0;
}
const struct sparc_gregset sparc64_linux_core_gregset =
{
32 * 8, /* %tstate */
33 * 8, /* %tpc */
34 * 8, /* %tnpc */
35 * 8, /* %y */
-1, /* %wim */
-1, /* %tbr */
1 * 8, /* %g1 */
16 * 8, /* %l0 */
8, /* y size */
};
static void
sparc64_linux_supply_core_gregset (const struct regset *regset,
struct regcache *regcache,
int regnum, const void *gregs, size_t len)
{
sparc64_supply_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs);
}
static void
sparc64_linux_collect_core_gregset (const struct regset *regset,
const struct regcache *regcache,
int regnum, void *gregs, size_t len)
{
sparc64_collect_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs);
}
static void
sparc64_linux_supply_core_fpregset (const struct regset *regset,
struct regcache *regcache,
int regnum, const void *fpregs, size_t len)
{
sparc64_supply_fpregset (regcache, regnum, fpregs);
}
static void
sparc64_linux_collect_core_fpregset (const struct regset *regset,
const struct regcache *regcache,
int regnum, void *fpregs, size_t len)
{
sparc64_collect_fpregset (regcache, regnum, fpregs);
}
static void
sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
tdep->gregset = regset_alloc (gdbarch, sparc64_linux_supply_core_gregset,
sparc64_linux_collect_core_gregset);
tdep->sizeof_gregset = 288;
tdep->fpregset = regset_alloc (gdbarch, sparc64_linux_supply_core_fpregset,
sparc64_linux_collect_core_fpregset);
tdep->sizeof_fpregset = 280;
tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe);
/* Hook in the DWARF CFI frame unwinder. */
frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
sparc64_init_abi (info, gdbarch);
/* GNU/Linux has SVR4-style shared libraries... */
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_lp64_fetch_link_map_offsets);
/* ...which means that we need some special handling when doing
prologue analysis. */
tdep->plt_entry_size = 16;
/* Enable TLS support. */
set_gdbarch_fetch_tls_load_module_address (gdbarch,
svr4_fetch_objfile_link_map);
/* Make sure we can single-step over signal return system calls. */
tdep->step_trap = sparc64_linux_step_trap;
}
/* Provide a prototype to silence -Wmissing-prototypes. */
extern void _initialize_sparc64_linux_tdep (void);
void
_initialize_sparc64_linux_tdep (void)
{
gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
GDB_OSABI_LINUX, sparc64_linux_init_abi);
}
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