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/* Target-dependent code for Solaris SPARC.
Copyright (C) 2003, 2004, 2006, 2007 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 "gdbcore.h"
#include "symtab.h"
#include "objfiles.h"
#include "osabi.h"
#include "regcache.h"
#include "target.h"
#include "trad-frame.h"
#include "gdb_assert.h"
#include "gdb_string.h"
#include "sol2-tdep.h"
#include "sparc-tdep.h"
#include "solib-svr4.h"
/* From <sys/regset.h>. */
const struct sparc_gregset sparc32_sol2_gregset =
{
32 * 4, /* %psr */
33 * 4, /* %pc */
34 * 4, /* %npc */
35 * 4, /* %y */
36 * 4, /* %wim */
37 * 4, /* %tbr */
1 * 4, /* %g1 */
16 * 4, /* %l0 */
};
/* The Solaris signal trampolines reside in libc. For normal signals,
the function `sigacthandler' is used. This signal trampoline will
call the signal handler using the System V calling convention,
where the third argument is a pointer to an instance of
`ucontext_t', which has a member `uc_mcontext' that contains the
saved registers. Incidentally, the kernel passes the `ucontext_t'
pointer as the third argument of the signal trampoline too, and
`sigacthandler' simply passes it on. However, if you link your
program with "-L/usr/ucblib -R/usr/ucblib -lucb", the function
`ucbsigvechandler' will be used, which invokes the using the BSD
convention, where the third argument is a pointer to an instance of
`struct sigcontext'. It is the `ucbsigvechandler' function that
converts the `ucontext_t' to a `sigcontext', and back. Unless the
signal handler modifies the `struct sigcontext' we can safely
ignore this. */
int
sparc_sol2_pc_in_sigtramp (CORE_ADDR pc, char *name)
{
return (name && (strcmp (name, "sigacthandler") == 0
|| strcmp (name, "ucbsigvechandler") == 0
|| strcmp (name, "__sighndlr") == 0));
}
static struct sparc_frame_cache *
sparc32_sol2_sigtramp_frame_cache (struct frame_info *next_frame,
void **this_cache)
{
struct sparc_frame_cache *cache;
CORE_ADDR mcontext_addr, addr;
int regnum;
if (*this_cache)
return *this_cache;
cache = sparc_frame_cache (next_frame, this_cache);
gdb_assert (cache == *this_cache);
cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
/* The third argument is a pointer to an instance of `ucontext_t',
which has a member `uc_mcontext' that contains the saved
registers. */
regnum = (cache->frameless_p ? SPARC_O2_REGNUM : SPARC_I2_REGNUM);
mcontext_addr = frame_unwind_register_unsigned (next_frame, regnum) + 40;
cache->saved_regs[SPARC32_PSR_REGNUM].addr = mcontext_addr + 0 * 4;
cache->saved_regs[SPARC32_PC_REGNUM].addr = mcontext_addr + 1 * 4;
cache->saved_regs[SPARC32_NPC_REGNUM].addr = mcontext_addr + 2 * 4;
cache->saved_regs[SPARC32_Y_REGNUM].addr = mcontext_addr + 3 * 4;
/* Since %g0 is always zero, keep the identity encoding. */
for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 4 * 4;
regnum <= SPARC_O7_REGNUM; regnum++, addr += 4)
cache->saved_regs[regnum].addr = addr;
if (get_frame_memory_unsigned (next_frame, mcontext_addr + 19 * 4, 4))
{
/* The register windows haven't been flushed. */
for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
trad_frame_set_unknown (cache->saved_regs, regnum);
}
else
{
addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
addr = get_frame_memory_unsigned (next_frame, addr, 4);
for (regnum = SPARC_L0_REGNUM;
regnum <= SPARC_I7_REGNUM; regnum++, addr += 4)
cache->saved_regs[regnum].addr = addr;
}
return cache;
}
static void
sparc32_sol2_sigtramp_frame_this_id (struct frame_info *next_frame,
void **this_cache,
struct frame_id *this_id)
{
struct sparc_frame_cache *cache =
sparc32_sol2_sigtramp_frame_cache (next_frame, this_cache);
(*this_id) = frame_id_build (cache->base, cache->pc);
}
static void
sparc32_sol2_sigtramp_frame_prev_register (struct frame_info *next_frame,
void **this_cache,
int regnum, int *optimizedp,
enum lval_type *lvalp,
CORE_ADDR *addrp,
int *realnump, gdb_byte *valuep)
{
struct sparc_frame_cache *cache =
sparc32_sol2_sigtramp_frame_cache (next_frame, this_cache);
trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
optimizedp, lvalp, addrp, realnump, valuep);
}
static const struct frame_unwind sparc32_sol2_sigtramp_frame_unwind =
{
SIGTRAMP_FRAME,
sparc32_sol2_sigtramp_frame_this_id,
sparc32_sol2_sigtramp_frame_prev_register
};
static const struct frame_unwind *
sparc32_sol2_sigtramp_frame_sniffer (struct frame_info *next_frame)
{
CORE_ADDR pc = frame_pc_unwind (next_frame);
char *name;
find_pc_partial_function (pc, &name, NULL, NULL);
if (sparc_sol2_pc_in_sigtramp (pc, name))
return &sparc32_sol2_sigtramp_frame_unwind;
return NULL;
}
void
sparc32_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
/* Solaris has SVR4-style shared libraries... */
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver);
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
/* ...which means that we need some special handling when doing
prologue analysis. */
tdep->plt_entry_size = 12;
/* Solaris has kernel-assisted single-stepping support. */
set_gdbarch_software_single_step (gdbarch, NULL);
frame_unwind_append_sniffer (gdbarch, sparc32_sol2_sigtramp_frame_sniffer);
}
/* Provide a prototype to silence -Wmissing-prototypes. */
void _initialize_sparc_sol2_tdep (void);
void
_initialize_sparc_sol2_tdep (void)
{
gdbarch_register_osabi (bfd_arch_sparc, 0,
GDB_OSABI_SOLARIS, sparc32_sol2_init_abi);
}
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