#include "defs.h"
#include "arch-utils.h"
#include "frame.h"
#include "gdbcore.h"
#include "regcache.h"
#include "regset.h"
#include "osabi.h"
#include "symtab.h"
#include "gdb_assert.h"
#include "gdb_string.h"
#include "i386-tdep.h"
#include "i387-tdep.h"
#include "nbsd-tdep.h"
#include "solib-svr4.h"
static int i386nbsd_r_reg_offset[] =
{
0 * 4,
1 * 4,
2 * 4,
3 * 4,
4 * 4,
5 * 4,
6 * 4,
7 * 4,
8 * 4,
9 * 4,
10 * 4,
11 * 4,
12 * 4,
13 * 4,
14 * 4,
15 * 4
};
static void
i386nbsd_aout_supply_regset (const struct regset *regset,
struct regcache *regcache, int regnum,
const void *regs, size_t len)
{
const struct gdbarch_tdep *tdep = gdbarch_tdep (regset->arch);
gdb_assert (len >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE);
i386_supply_gregset (regset, regcache, regnum, regs, tdep->sizeof_gregset);
i387_supply_fsave (regcache, regnum, (char *) regs + tdep->sizeof_gregset);
}
static const struct regset *
i386nbsd_aout_regset_from_core_section (struct gdbarch *gdbarch,
const char *sect_name,
size_t sect_size)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
if (strcmp (sect_name, ".reg") == 0
&& sect_size >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE)
{
if (tdep->gregset == NULL)
tdep->gregset =
regset_alloc (gdbarch, i386nbsd_aout_supply_regset, NULL);
return tdep->gregset;
}
return NULL;
}
#define RETCODE_INSN1 0x8d
#define RETCODE_INSN2 0x50
#define RETCODE_INSN3 0x50
#define RETCODE_INSN4 0xb8
#define RETCODE_INSN5 0xcd
#define RETCODE_INSN2_OFF 4
#define RETCODE_INSN3_OFF 5
#define RETCODE_INSN4_OFF 6
#define RETCODE_INSN5_OFF 11
static const unsigned char sigtramp_retcode[] =
{
RETCODE_INSN1, 0x44, 0x24, 0x10,
RETCODE_INSN2,
RETCODE_INSN3,
RETCODE_INSN4, 0x27, 0x01, 0x00, 0x00,
RETCODE_INSN5, 0x80,
};
static LONGEST
i386nbsd_sigtramp_offset (struct frame_info *next_frame)
{
CORE_ADDR pc = frame_pc_unwind (next_frame);
unsigned char ret[sizeof(sigtramp_retcode)], insn;
LONGEST off;
int i;
if (!safe_frame_unwind_memory (next_frame, pc, &insn, 1))
return -1;
switch (insn)
{
case RETCODE_INSN1:
off = 0;
break;
case RETCODE_INSN2:
if (!safe_frame_unwind_memory (next_frame, pc + 1, &insn, 1))
return -1;
if (insn == RETCODE_INSN3)
off = RETCODE_INSN2_OFF;
else
off = RETCODE_INSN3_OFF;
break;
case RETCODE_INSN4:
off = RETCODE_INSN4_OFF;
break;
case RETCODE_INSN5:
off = RETCODE_INSN5_OFF;
break;
default:
return -1;
}
pc -= off;
if (!safe_frame_unwind_memory (next_frame, pc, ret, sizeof (ret)))
return -1;
if (memcmp (ret, sigtramp_retcode, sizeof (ret)) == 0)
return off;
return -1;
}
static int
i386nbsd_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 (nbsd_pc_in_sigtramp (pc, name)
|| i386nbsd_sigtramp_offset (next_frame) >= 0);
}
int i386nbsd_sc_reg_offset[] =
{
10 * 4,
9 * 4,
8 * 4,
7 * 4,
14 * 4,
6 * 4,
5 * 4,
4 * 4,
11 * 4,
13 * 4,
12 * 4,
15 * 4,
3 * 4,
2 * 4,
1 * 4,
0 * 4
};
static void
i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
i386bsd_init_abi (info, gdbarch);
tdep->gregset_reg_offset = i386nbsd_r_reg_offset;
tdep->gregset_num_regs = ARRAY_SIZE (i386nbsd_r_reg_offset);
tdep->sizeof_gregset = 16 * 4;
tdep->sigtramp_start = 0;
tdep->sigtramp_end = 0;
tdep->sigtramp_p = i386nbsd_sigtramp_p;
tdep->struct_return = reg_struct_return;
tdep->sc_reg_offset = i386nbsd_sc_reg_offset;
tdep->sc_num_regs = ARRAY_SIZE (i386nbsd_sc_reg_offset);
}
static void
i386nbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
i386nbsd_init_abi (info, gdbarch);
set_gdbarch_regset_from_core_section
(gdbarch, i386nbsd_aout_regset_from_core_section);
}
static void
i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
i386nbsd_init_abi (info, gdbarch);
i386_elf_init_abi (info, gdbarch);
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
tdep->struct_return = pcc_struct_return;
}
void
_initialize_i386nbsd_tdep (void)
{
gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD_AOUT,
i386nbsdaout_init_abi);
gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD_ELF,
i386nbsdelf_init_abi);
}