3f2f6cb5e8
New bnds fields will be always present for x86 architecture.
Fixup for compatibility layer 32bits has to be fixed.
It was added the nat_siginfo to serving as intermediate step
between kernel provided siginfo and the fix up routine.
When executing compat_siginfo_from_siginfo or
compat_x32_siginfo_from_siginfo first the buffer read from the kernel are
converted into the nat_signfo for homogenization, then the fields of
nat_siginfo are use to set the compat and compat_x32 siginfo fields.
In other to make this conversion independent of the system where gdb
is compiled the most complete version of the siginfo, named as native
siginfo, is used internally as an intermediate step.
Conversion using nat_siginfo is exemplified below:
compat_siginfo_from_siginfo or compat_x32_siginfo_from_siginfo:
buffer (from the kernel) -> nat_siginfo -> 32 / X32 siginfo
(memcpy) (field by field)
siginfo_from_compat_x32_siginfo or siginfo_from_compat_siginfo:
32 / X32 siginfo -> nat_siginfo -> buffer (to the kernel)
(field by field) (memcpy)
Caveat: No support for MPX on x32.
2016-02-02 Walfred Tedeschi <walfred.tedeschi@intel.com>
gdb/ChangeLog:
* amd64-linux-siginfo.c (nat_siginfo_t, nat_sigval_t, nat_timeval):
New types.
(compat_siginfo): New bound fields added.
(compat_x32_siginfo): New field added.
(cpt_si_addr_lsb): New define.
(compat_siginfo_from_siginfo): Use nat_siginfo.
(siginfo_from_compat_siginfo): Use nat_siginfo.
(compat_x32_siginfo_from_siginfo): Likewise.
(siginfo_from_compat_x32_siginfo): Likewise.
56 lines
2 KiB
C
56 lines
2 KiB
C
/* Low-level siginfo manipulation for amd64.
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Copyright (C) 2016 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef AMD64_LINUX_SIGINFO_H
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#define AMD64_LINUX_SIGINFO_H 1
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/* When GDB is built as a 64-bit application on Linux, the
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PTRACE_GETSIGINFO data is always presented in 64-bit layout. Since
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debugging a 32-bit inferior with a 64-bit GDB should look the same
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as debugging it with a 32-bit GDB, we do the 32-bit <-> 64-bit
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conversion in-place ourselves.
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In other to make this conversion independent of the system where gdb
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is compiled the most complete version of the siginfo, named as native
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siginfo, is used internally as an intermediate step.
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Conversion using nat_siginfo is exemplified below:
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compat_siginfo_from_siginfo or compat_x32_siginfo_from_siginfo
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buffer (from the kernel) -> nat_siginfo -> 32 / X32 siginfo
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siginfo_from_compat_x32_siginfo or siginfo_from_compat_siginfo
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32 / X32 siginfo -> nat_siginfo -> buffer (to the kernel) */
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/* Kind of siginfo fixup to be performed. */
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enum amd64_siginfo_fixup_mode
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{
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FIXUP_32 = 1, /* Fixup for 32bit. */
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FIXUP_X32 = 2 /* Fixup for x32. */
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};
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/* Common code for performing the fixup of the siginfo. */
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int amd64_linux_siginfo_fixup_common (siginfo_t *native, gdb_byte *inf,
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int direction,
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enum amd64_siginfo_fixup_mode mode);
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#endif
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