301 lines
7.7 KiB
C
301 lines
7.7 KiB
C
/* Target-dependent code for QNX Neutrino x86.
|
|
|
|
Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
|
|
|
|
Contributed by QNX Software Systems Ltd.
|
|
|
|
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 2 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, write to the Free Software
|
|
Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
Boston, MA 02110-1301, USA. */
|
|
|
|
#include "defs.h"
|
|
#include "frame.h"
|
|
#include "osabi.h"
|
|
#include "regcache.h"
|
|
#include "target.h"
|
|
|
|
#include "gdb_assert.h"
|
|
#include "gdb_string.h"
|
|
|
|
#include "i386-tdep.h"
|
|
#include "i387-tdep.h"
|
|
#include "nto-tdep.h"
|
|
#include "solib-svr4.h"
|
|
|
|
/* Target vector for QNX NTO x86. */
|
|
static struct nto_target_ops i386_nto_target;
|
|
|
|
#ifndef X86_CPU_FXSR
|
|
#define X86_CPU_FXSR (1L << 12)
|
|
#endif
|
|
|
|
/* Why 13? Look in our /usr/include/x86/context.h header at the
|
|
x86_cpu_registers structure and you'll see an 'exx' junk register
|
|
that is just filler. Don't ask me, ask the kernel guys. */
|
|
#define NUM_GPREGS 13
|
|
|
|
/* Mapping between the general-purpose registers in `struct xxx'
|
|
format and GDB's register cache layout. */
|
|
|
|
/* From <x86/context.h>. */
|
|
static int i386nto_gregset_reg_offset[] =
|
|
{
|
|
7 * 4, /* %eax */
|
|
6 * 4, /* %ecx */
|
|
5 * 4, /* %edx */
|
|
4 * 4, /* %ebx */
|
|
11 * 4, /* %esp */
|
|
2 * 4, /* %epb */
|
|
1 * 4, /* %esi */
|
|
0 * 4, /* %edi */
|
|
8 * 4, /* %eip */
|
|
10 * 4, /* %eflags */
|
|
9 * 4, /* %cs */
|
|
12 * 4, /* %ss */
|
|
-1 /* filler */
|
|
};
|
|
|
|
/* Given a GDB register number REGNUM, return the offset into
|
|
Neutrino's register structure or -1 if the register is unknown. */
|
|
|
|
static int
|
|
nto_reg_offset (int regnum)
|
|
{
|
|
if (regnum >= 0 && regnum < ARRAY_SIZE (i386nto_gregset_reg_offset))
|
|
return i386nto_gregset_reg_offset[regnum];
|
|
|
|
return -1;
|
|
}
|
|
|
|
static void
|
|
i386nto_supply_gregset (char *gpregs)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
|
|
|
|
if(tdep->gregset == NULL)
|
|
tdep->gregset = regset_alloc (current_gdbarch, i386_supply_gregset,
|
|
i386_collect_gregset);
|
|
|
|
gdb_assert (tdep->gregset_reg_offset == i386nto_gregset_reg_offset);
|
|
tdep->gregset->supply_regset (tdep->gregset, current_regcache, -1,
|
|
gpregs, NUM_GPREGS * 4);
|
|
}
|
|
|
|
static void
|
|
i386nto_supply_fpregset (char *fpregs)
|
|
{
|
|
if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR)
|
|
i387_supply_fxsave (current_regcache, -1, fpregs);
|
|
else
|
|
i387_supply_fsave (current_regcache, -1, fpregs);
|
|
}
|
|
|
|
static void
|
|
i386nto_supply_regset (int regset, char *data)
|
|
{
|
|
switch (regset)
|
|
{
|
|
case NTO_REG_GENERAL:
|
|
i386nto_supply_gregset (data);
|
|
break;
|
|
case NTO_REG_FLOAT:
|
|
i386nto_supply_fpregset (data);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int
|
|
i386nto_regset_id (int regno)
|
|
{
|
|
if (regno == -1)
|
|
return NTO_REG_END;
|
|
else if (regno < I386_NUM_GREGS)
|
|
return NTO_REG_GENERAL;
|
|
else if (regno < I386_NUM_GREGS + I386_NUM_FREGS)
|
|
return NTO_REG_FLOAT;
|
|
|
|
return -1; /* Error. */
|
|
}
|
|
|
|
static int
|
|
i386nto_register_area (int regno, int regset, unsigned *off)
|
|
{
|
|
int len;
|
|
|
|
*off = 0;
|
|
if (regset == NTO_REG_GENERAL)
|
|
{
|
|
if (regno == -1)
|
|
return NUM_GPREGS * 4;
|
|
|
|
*off = nto_reg_offset (regno);
|
|
if (*off == -1)
|
|
return 0;
|
|
return 4;
|
|
}
|
|
else if (regset == NTO_REG_FLOAT)
|
|
{
|
|
unsigned off_adjust, regsize, regset_size;
|
|
|
|
if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR)
|
|
{
|
|
off_adjust = 32;
|
|
regsize = 16;
|
|
regset_size = 512;
|
|
}
|
|
else
|
|
{
|
|
off_adjust = 28;
|
|
regsize = 10;
|
|
regset_size = 128;
|
|
}
|
|
|
|
if (regno == -1)
|
|
return regset_size;
|
|
|
|
*off = (regno - FP0_REGNUM) * regsize + off_adjust;
|
|
return 10;
|
|
/* Why 10 instead of regsize? GDB only stores 10 bytes per FP
|
|
register so if we're sending a register back to the target,
|
|
we only want pdebug to write 10 bytes so as not to clobber
|
|
the reserved 6 bytes in the fxsave structure. */
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
i386nto_regset_fill (int regset, char *data)
|
|
{
|
|
if (regset == NTO_REG_GENERAL)
|
|
{
|
|
int regno;
|
|
|
|
for (regno = 0; regno < NUM_GPREGS; regno++)
|
|
{
|
|
int offset = nto_reg_offset (regno);
|
|
if (offset != -1)
|
|
regcache_raw_collect (current_regcache, regno, data + offset);
|
|
}
|
|
}
|
|
else if (regset == NTO_REG_FLOAT)
|
|
{
|
|
if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR)
|
|
i387_fill_fxsave (data, -1);
|
|
else
|
|
i387_fill_fsave (data, -1);
|
|
}
|
|
else
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Return whether the frame preceding NEXT_FRAME corresponds to a QNX
|
|
Neutrino sigtramp routine. */
|
|
|
|
static int
|
|
i386nto_sigtramp_p (struct frame_info *next_frame)
|
|
{
|
|
CORE_ADDR pc = frame_pc_unwind (next_frame);
|
|
char *name;
|
|
|
|
find_pc_partial_function (pc, &name, NULL, NULL);
|
|
return name && strcmp ("__signalstub", name) == 0;
|
|
}
|
|
|
|
#define I386_NTO_SIGCONTEXT_OFFSET 136
|
|
|
|
/* Assuming NEXT_FRAME is a frame following a QNX Neutrino sigtramp
|
|
routine, return the address of the associated sigcontext structure. */
|
|
|
|
static CORE_ADDR
|
|
i386nto_sigcontext_addr (struct frame_info *next_frame)
|
|
{
|
|
char buf[4];
|
|
CORE_ADDR sp;
|
|
|
|
frame_unwind_register (next_frame, I386_ESP_REGNUM, buf);
|
|
sp = extract_unsigned_integer (buf, 4);
|
|
|
|
return sp + I386_NTO_SIGCONTEXT_OFFSET;
|
|
}
|
|
|
|
static void
|
|
init_i386nto_ops (void)
|
|
{
|
|
i386_nto_target.regset_id = i386nto_regset_id;
|
|
i386_nto_target.supply_gregset = i386nto_supply_gregset;
|
|
i386_nto_target.supply_fpregset = i386nto_supply_fpregset;
|
|
i386_nto_target.supply_altregset = nto_dummy_supply_regset;
|
|
i386_nto_target.supply_regset = i386nto_supply_regset;
|
|
i386_nto_target.register_area = i386nto_register_area;
|
|
i386_nto_target.regset_fill = i386nto_regset_fill;
|
|
i386_nto_target.fetch_link_map_offsets =
|
|
svr4_ilp32_fetch_link_map_offsets;
|
|
}
|
|
|
|
static void
|
|
i386nto_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
|
|
/* Deal with our strange signals. */
|
|
nto_initialize_signals ();
|
|
|
|
/* NTO uses ELF. */
|
|
i386_elf_init_abi (info, gdbarch);
|
|
|
|
/* Neutrino rewinds to look more normal. Need to override the i386
|
|
default which is [unfortunately] to decrement the PC. */
|
|
set_gdbarch_decr_pc_after_break (gdbarch, 0);
|
|
|
|
tdep->gregset_reg_offset = i386nto_gregset_reg_offset;
|
|
tdep->gregset_num_regs = ARRAY_SIZE (i386nto_gregset_reg_offset);
|
|
tdep->sizeof_gregset = NUM_GPREGS * 4;
|
|
|
|
tdep->sigtramp_p = i386nto_sigtramp_p;
|
|
tdep->sigcontext_addr = i386nto_sigcontext_addr;
|
|
tdep->sc_pc_offset = 56;
|
|
tdep->sc_sp_offset = 68;
|
|
|
|
/* Setjmp()'s return PC saved in EDX (5). */
|
|
tdep->jb_pc_offset = 20; /* 5x32 bit ints in. */
|
|
|
|
set_solib_svr4_fetch_link_map_offsets
|
|
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
|
|
|
|
/* Our loader handles solib relocations slightly differently than svr4. */
|
|
TARGET_SO_RELOCATE_SECTION_ADDRESSES = nto_relocate_section_addresses;
|
|
|
|
/* Supply a nice function to find our solibs. */
|
|
TARGET_SO_FIND_AND_OPEN_SOLIB = nto_find_and_open_solib;
|
|
|
|
/* Our linker code is in libc. */
|
|
TARGET_SO_IN_DYNSYM_RESOLVE_CODE = nto_in_dynsym_resolve_code;
|
|
|
|
nto_set_target (&i386_nto_target);
|
|
}
|
|
|
|
void
|
|
_initialize_i386nto_tdep (void)
|
|
{
|
|
init_i386nto_ops ();
|
|
gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_QNXNTO,
|
|
i386nto_init_abi);
|
|
gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
|
|
nto_elf_osabi_sniffer);
|
|
}
|