773eacf5b0
- Do not leave operators at end-of-line. - Fix block indentation in if-else chain. gdb/ChangeLog: * amd64fbsd-tdep.c (amd64fbsd_sigtramp_p): Style fixes. * i386fbsd-tdep.c: Fix style in various gdb_static_assert expressions. (i386fbsd_sigtramp_p): Likewise.
392 lines
11 KiB
C
392 lines
11 KiB
C
/* Target-dependent code for FreeBSD/i386.
|
||
|
||
Copyright (C) 2003-2015 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 "arch-utils.h"
|
||
#include "gdbcore.h"
|
||
#include "osabi.h"
|
||
#include "regcache.h"
|
||
|
||
#include "i386-tdep.h"
|
||
#include "i387-tdep.h"
|
||
#include "bsd-uthread.h"
|
||
#include "fbsd-tdep.h"
|
||
#include "solib-svr4.h"
|
||
|
||
/* Support for signal handlers. */
|
||
|
||
/* Return whether THIS_FRAME corresponds to a FreeBSD sigtramp
|
||
routine. */
|
||
|
||
/* FreeBSD/i386 supports three different signal trampolines, one for
|
||
versions before 4.0, a second for 4.x, and a third for 5.0 and
|
||
later. To complicate matters, FreeBSD/i386 binaries running under
|
||
an amd64 kernel use a different set of trampolines. These
|
||
trampolines differ from the i386 kernel trampolines in that they
|
||
omit a middle section that conditionally restores %gs. */
|
||
|
||
static const gdb_byte i386fbsd_sigtramp_start[] =
|
||
{
|
||
0x8d, 0x44, 0x24, 0x20, /* lea SIGF_UC(%esp),%eax */
|
||
0x50 /* pushl %eax */
|
||
};
|
||
|
||
static const gdb_byte i386fbsd_sigtramp_middle[] =
|
||
{
|
||
0xf7, 0x40, 0x54, 0x00, 0x00, 0x02, 0x00,
|
||
/* testl $PSL_VM,UC_EFLAGS(%eax) */
|
||
0x75, 0x03, /* jne +3 */
|
||
0x8e, 0x68, 0x14 /* mov UC_GS(%eax),%gs */
|
||
};
|
||
|
||
static const gdb_byte i386fbsd_sigtramp_end[] =
|
||
{
|
||
0xb8, 0xa1, 0x01, 0x00, 0x00, /* movl $SYS_sigreturn,%eax */
|
||
0x50, /* pushl %eax */
|
||
0xcd, 0x80 /* int $0x80 */
|
||
};
|
||
|
||
static const gdb_byte i386fbsd_freebsd4_sigtramp_start[] =
|
||
{
|
||
0x8d, 0x44, 0x24, 0x14, /* lea SIGF_UC4(%esp),%eax */
|
||
0x50 /* pushl %eax */
|
||
};
|
||
|
||
static const gdb_byte i386fbsd_freebsd4_sigtramp_middle[] =
|
||
{
|
||
0xf7, 0x40, 0x54, 0x00, 0x00, 0x02, 0x00,
|
||
/* testl $PSL_VM,UC4_EFLAGS(%eax) */
|
||
0x75, 0x03, /* jne +3 */
|
||
0x8e, 0x68, 0x14 /* mov UC4_GS(%eax),%gs */
|
||
};
|
||
|
||
static const gdb_byte i386fbsd_freebsd4_sigtramp_end[] =
|
||
{
|
||
0xb8, 0x58, 0x01, 0x00, 0x00, /* movl $344,%eax */
|
||
0x50, /* pushl %eax */
|
||
0xcd, 0x80 /* int $0x80 */
|
||
};
|
||
|
||
static const gdb_byte i386fbsd_osigtramp_start[] =
|
||
{
|
||
0x8d, 0x44, 0x24, 0x14, /* lea SIGF_SC(%esp),%eax */
|
||
0x50 /* pushl %eax */
|
||
};
|
||
|
||
static const gdb_byte i386fbsd_osigtramp_middle[] =
|
||
{
|
||
0xf7, 0x40, 0x18, 0x00, 0x00, 0x02, 0x00,
|
||
/* testl $PSL_VM,SC_PS(%eax) */
|
||
0x75, 0x03, /* jne +3 */
|
||
0x8e, 0x68, 0x44 /* mov SC_GS(%eax),%gs */
|
||
};
|
||
|
||
static const gdb_byte i386fbsd_osigtramp_end[] =
|
||
{
|
||
0xb8, 0x67, 0x00, 0x00, 0x00, /* movl $103,%eax */
|
||
0x50, /* pushl %eax */
|
||
0xcd, 0x80 /* int $0x80 */
|
||
};
|
||
|
||
/* The three different trampolines are all the same size. */
|
||
gdb_static_assert (sizeof i386fbsd_sigtramp_start
|
||
== sizeof i386fbsd_freebsd4_sigtramp_start);
|
||
gdb_static_assert (sizeof i386fbsd_sigtramp_start
|
||
== sizeof i386fbsd_osigtramp_start);
|
||
gdb_static_assert (sizeof i386fbsd_sigtramp_middle
|
||
== sizeof i386fbsd_freebsd4_sigtramp_middle);
|
||
gdb_static_assert (sizeof i386fbsd_sigtramp_middle
|
||
== sizeof i386fbsd_osigtramp_middle);
|
||
gdb_static_assert (sizeof i386fbsd_sigtramp_end
|
||
== sizeof i386fbsd_freebsd4_sigtramp_end);
|
||
gdb_static_assert (sizeof i386fbsd_sigtramp_end
|
||
== sizeof i386fbsd_osigtramp_end);
|
||
|
||
/* We assume that the middle is the largest chunk below. */
|
||
gdb_static_assert (sizeof i386fbsd_sigtramp_middle
|
||
> sizeof i386fbsd_sigtramp_start);
|
||
gdb_static_assert (sizeof i386fbsd_sigtramp_middle
|
||
> sizeof i386fbsd_sigtramp_end);
|
||
|
||
static int
|
||
i386fbsd_sigtramp_p (struct frame_info *this_frame)
|
||
{
|
||
CORE_ADDR pc = get_frame_pc (this_frame);
|
||
gdb_byte buf[sizeof i386fbsd_sigtramp_middle];
|
||
const gdb_byte *middle, *end;
|
||
|
||
/* Look for a matching start. */
|
||
if (!safe_frame_unwind_memory (this_frame, pc, buf,
|
||
sizeof i386fbsd_sigtramp_start))
|
||
return 0;
|
||
if (memcmp (buf, i386fbsd_sigtramp_start, sizeof i386fbsd_sigtramp_start)
|
||
== 0)
|
||
{
|
||
middle = i386fbsd_sigtramp_middle;
|
||
end = i386fbsd_sigtramp_end;
|
||
}
|
||
else if (memcmp (buf, i386fbsd_freebsd4_sigtramp_start,
|
||
sizeof i386fbsd_freebsd4_sigtramp_start) == 0)
|
||
{
|
||
middle = i386fbsd_freebsd4_sigtramp_middle;
|
||
end = i386fbsd_freebsd4_sigtramp_end;
|
||
}
|
||
else if (memcmp (buf, i386fbsd_osigtramp_start,
|
||
sizeof i386fbsd_osigtramp_start) == 0)
|
||
{
|
||
middle = i386fbsd_osigtramp_middle;
|
||
end = i386fbsd_osigtramp_end;
|
||
}
|
||
else
|
||
return 0;
|
||
|
||
/* Since the end is shorter than the middle, check for a matching end
|
||
next. */
|
||
pc += sizeof i386fbsd_sigtramp_start;
|
||
if (!safe_frame_unwind_memory (this_frame, pc, buf,
|
||
sizeof i386fbsd_sigtramp_end))
|
||
return 0;
|
||
if (memcmp (buf, end, sizeof i386fbsd_sigtramp_end) == 0)
|
||
return 1;
|
||
|
||
/* If the end didn't match, check for a matching middle. */
|
||
if (!safe_frame_unwind_memory (this_frame, pc, buf,
|
||
sizeof i386fbsd_sigtramp_middle))
|
||
return 0;
|
||
if (memcmp (buf, middle, sizeof i386fbsd_sigtramp_middle) != 0)
|
||
return 0;
|
||
|
||
/* The middle matched, check for a matching end. */
|
||
pc += sizeof i386fbsd_sigtramp_middle;
|
||
if (!safe_frame_unwind_memory (this_frame, pc, buf,
|
||
sizeof i386fbsd_sigtramp_end))
|
||
return 0;
|
||
if (memcmp (buf, end, sizeof i386fbsd_sigtramp_end) != 0)
|
||
return 0;
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* FreeBSD 3.0-RELEASE or later. */
|
||
|
||
/* From <machine/reg.h>. */
|
||
static int i386fbsd_r_reg_offset[] =
|
||
{
|
||
9 * 4, 8 * 4, 7 * 4, 6 * 4, /* %eax, %ecx, %edx, %ebx */
|
||
15 * 4, 4 * 4, /* %esp, %ebp */
|
||
3 * 4, 2 * 4, /* %esi, %edi */
|
||
12 * 4, 14 * 4, /* %eip, %eflags */
|
||
13 * 4, 16 * 4, /* %cs, %ss */
|
||
1 * 4, 0 * 4, -1, -1 /* %ds, %es, %fs, %gs */
|
||
};
|
||
|
||
/* Sigtramp routine location. */
|
||
CORE_ADDR i386fbsd_sigtramp_start_addr;
|
||
CORE_ADDR i386fbsd_sigtramp_end_addr;
|
||
|
||
/* From <machine/signal.h>. */
|
||
int i386fbsd_sc_reg_offset[] =
|
||
{
|
||
8 + 14 * 4, /* %eax */
|
||
8 + 13 * 4, /* %ecx */
|
||
8 + 12 * 4, /* %edx */
|
||
8 + 11 * 4, /* %ebx */
|
||
8 + 0 * 4, /* %esp */
|
||
8 + 1 * 4, /* %ebp */
|
||
8 + 10 * 4, /* %esi */
|
||
8 + 9 * 4, /* %edi */
|
||
8 + 3 * 4, /* %eip */
|
||
8 + 4 * 4, /* %eflags */
|
||
8 + 7 * 4, /* %cs */
|
||
8 + 8 * 4, /* %ss */
|
||
8 + 6 * 4, /* %ds */
|
||
8 + 5 * 4, /* %es */
|
||
8 + 15 * 4, /* %fs */
|
||
8 + 16 * 4 /* %gs */
|
||
};
|
||
|
||
/* From /usr/src/lib/libc/i386/gen/_setjmp.S. */
|
||
static int i386fbsd_jmp_buf_reg_offset[] =
|
||
{
|
||
-1, /* %eax */
|
||
-1, /* %ecx */
|
||
-1, /* %edx */
|
||
1 * 4, /* %ebx */
|
||
2 * 4, /* %esp */
|
||
3 * 4, /* %ebp */
|
||
4 * 4, /* %esi */
|
||
5 * 4, /* %edi */
|
||
0 * 4 /* %eip */
|
||
};
|
||
|
||
static void
|
||
i386fbsd_supply_uthread (struct regcache *regcache,
|
||
int regnum, CORE_ADDR addr)
|
||
{
|
||
gdb_byte buf[4];
|
||
int i;
|
||
|
||
gdb_assert (regnum >= -1);
|
||
|
||
for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++)
|
||
{
|
||
if (i386fbsd_jmp_buf_reg_offset[i] != -1
|
||
&& (regnum == -1 || regnum == i))
|
||
{
|
||
read_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4);
|
||
regcache_raw_supply (regcache, i, buf);
|
||
}
|
||
}
|
||
}
|
||
|
||
static void
|
||
i386fbsd_collect_uthread (const struct regcache *regcache,
|
||
int regnum, CORE_ADDR addr)
|
||
{
|
||
gdb_byte buf[4];
|
||
int i;
|
||
|
||
gdb_assert (regnum >= -1);
|
||
|
||
for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++)
|
||
{
|
||
if (i386fbsd_jmp_buf_reg_offset[i] != -1
|
||
&& (regnum == -1 || regnum == i))
|
||
{
|
||
regcache_raw_collect (regcache, i, buf);
|
||
write_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4);
|
||
}
|
||
}
|
||
}
|
||
|
||
static void
|
||
i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
|
||
/* Obviously FreeBSD is BSD-based. */
|
||
i386bsd_init_abi (info, gdbarch);
|
||
|
||
/* FreeBSD has a different `struct reg', and reserves some space for
|
||
its FPU emulator in `struct fpreg'. */
|
||
tdep->gregset_reg_offset = i386fbsd_r_reg_offset;
|
||
tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd_r_reg_offset);
|
||
tdep->sizeof_gregset = 18 * 4;
|
||
tdep->sizeof_fpregset = 176;
|
||
|
||
/* FreeBSD uses -freg-struct-return by default. */
|
||
tdep->struct_return = reg_struct_return;
|
||
|
||
tdep->sigtramp_p = i386fbsd_sigtramp_p;
|
||
|
||
/* FreeBSD uses a different memory layout. */
|
||
tdep->sigtramp_start = i386fbsd_sigtramp_start_addr;
|
||
tdep->sigtramp_end = i386fbsd_sigtramp_end_addr;
|
||
|
||
/* FreeBSD has a more complete `struct sigcontext'. */
|
||
tdep->sc_reg_offset = i386fbsd_sc_reg_offset;
|
||
tdep->sc_num_regs = ARRAY_SIZE (i386fbsd_sc_reg_offset);
|
||
|
||
/* FreeBSD provides a user-level threads implementation. */
|
||
bsd_uthread_set_supply_uthread (gdbarch, i386fbsd_supply_uthread);
|
||
bsd_uthread_set_collect_uthread (gdbarch, i386fbsd_collect_uthread);
|
||
}
|
||
|
||
static void
|
||
i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
||
{
|
||
/* It's almost identical to FreeBSD a.out. */
|
||
i386fbsdaout_init_abi (info, gdbarch);
|
||
|
||
/* Except that it uses ELF. */
|
||
i386_elf_init_abi (info, gdbarch);
|
||
|
||
/* FreeBSD ELF uses SVR4-style shared libraries. */
|
||
set_solib_svr4_fetch_link_map_offsets
|
||
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
|
||
}
|
||
|
||
/* FreeBSD 4.0-RELEASE or later. */
|
||
|
||
/* From <machine/reg.h>. */
|
||
static int i386fbsd4_r_reg_offset[] =
|
||
{
|
||
10 * 4, 9 * 4, 8 * 4, 7 * 4, /* %eax, %ecx, %edx, %ebx */
|
||
16 * 4, 5 * 4, /* %esp, %ebp */
|
||
4 * 4, 3 * 4, /* %esi, %edi */
|
||
13 * 4, 15 * 4, /* %eip, %eflags */
|
||
14 * 4, 17 * 4, /* %cs, %ss */
|
||
2 * 4, 1 * 4, 0 * 4, 18 * 4 /* %ds, %es, %fs, %gs */
|
||
};
|
||
|
||
/* From <machine/signal.h>. */
|
||
int i386fbsd4_sc_reg_offset[] =
|
||
{
|
||
20 + 11 * 4, /* %eax */
|
||
20 + 10 * 4, /* %ecx */
|
||
20 + 9 * 4, /* %edx */
|
||
20 + 8 * 4, /* %ebx */
|
||
20 + 17 * 4, /* %esp */
|
||
20 + 6 * 4, /* %ebp */
|
||
20 + 5 * 4, /* %esi */
|
||
20 + 4 * 4, /* %edi */
|
||
20 + 14 * 4, /* %eip */
|
||
20 + 16 * 4, /* %eflags */
|
||
20 + 15 * 4, /* %cs */
|
||
20 + 18 * 4, /* %ss */
|
||
20 + 3 * 4, /* %ds */
|
||
20 + 2 * 4, /* %es */
|
||
20 + 1 * 4, /* %fs */
|
||
20 + 0 * 4 /* %gs */
|
||
};
|
||
|
||
static void
|
||
i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
|
||
/* Generic FreeBSD support. */
|
||
fbsd_init_abi (info, gdbarch);
|
||
|
||
/* Inherit stuff from older releases. We assume that FreeBSD
|
||
4.0-RELEASE always uses ELF. */
|
||
i386fbsd_init_abi (info, gdbarch);
|
||
|
||
/* FreeBSD 4.0 introduced a new `struct reg'. */
|
||
tdep->gregset_reg_offset = i386fbsd4_r_reg_offset;
|
||
tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd4_r_reg_offset);
|
||
tdep->sizeof_gregset = 19 * 4;
|
||
|
||
/* FreeBSD 4.0 introduced a new `struct sigcontext'. */
|
||
tdep->sc_reg_offset = i386fbsd4_sc_reg_offset;
|
||
tdep->sc_num_regs = ARRAY_SIZE (i386fbsd4_sc_reg_offset);
|
||
}
|
||
|
||
|
||
/* Provide a prototype to silence -Wmissing-prototypes. */
|
||
void _initialize_i386fbsd_tdep (void);
|
||
|
||
void
|
||
_initialize_i386fbsd_tdep (void)
|
||
{
|
||
gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_AOUT,
|
||
i386fbsdaout_init_abi);
|
||
gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_ELF,
|
||
i386fbsd4_init_abi);
|
||
}
|