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597 lines
14 KiB
C
597 lines
14 KiB
C
/* Low-level siginfo manipulation for amd64.
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Copyright (C) 2002-2017 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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#include <signal.h>
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#include "common-defs.h"
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#include "amd64-linux-siginfo.h"
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#define GDB_SI_SIZE 128
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/* The types below define the most complete kernel siginfo types known
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for the architecture, independent of the system/libc headers. They
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are named from a 64-bit kernel's perspective:
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| layout | type |
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|--------+----------------------|
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| 64-bit | nat_siginfo_t |
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| 32-bit | compat_siginfo_t |
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| x32 | compat_x32_siginfo_t |
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*/
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#ifndef __ILP32__
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typedef int nat_int_t;
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typedef unsigned long nat_uptr_t;
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typedef int nat_time_t;
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typedef int nat_timer_t;
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/* For native 64-bit, clock_t in _sigchld is 64-bit. */
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typedef long nat_clock_t;
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typedef union nat_sigval
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{
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nat_int_t sival_int;
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nat_uptr_t sival_ptr;
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} nat_sigval_t;
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typedef struct nat_siginfo
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{
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int si_signo;
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int si_errno;
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int si_code;
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union
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{
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int _pad[((128 / sizeof (int)) - 4)];
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/* kill() */
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struct
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{
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unsigned int _pid;
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unsigned int _uid;
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} _kill;
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/* POSIX.1b timers */
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struct
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{
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nat_timer_t _tid;
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int _overrun;
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nat_sigval_t _sigval;
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} _timer;
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/* POSIX.1b signals */
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struct
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{
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unsigned int _pid;
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unsigned int _uid;
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nat_sigval_t _sigval;
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} _rt;
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/* SIGCHLD */
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struct
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{
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unsigned int _pid;
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unsigned int _uid;
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int _status;
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nat_clock_t _utime;
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nat_clock_t _stime;
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} _sigchld;
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/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
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struct
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{
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nat_uptr_t _addr;
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short int _addr_lsb;
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struct
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{
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nat_uptr_t _lower;
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nat_uptr_t _upper;
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} si_addr_bnd;
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} _sigfault;
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/* SIGPOLL */
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struct
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{
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int _band;
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int _fd;
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} _sigpoll;
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} _sifields;
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} nat_siginfo_t;
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#endif /* __ILP32__ */
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/* These types below (compat_*) define a siginfo type that is layout
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compatible with the siginfo type exported by the 32-bit userspace
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support. */
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typedef int compat_int_t;
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typedef unsigned int compat_uptr_t;
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typedef int compat_time_t;
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typedef int compat_timer_t;
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typedef int compat_clock_t;
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struct compat_timeval
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{
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compat_time_t tv_sec;
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int tv_usec;
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};
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typedef union compat_sigval
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{
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compat_int_t sival_int;
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compat_uptr_t sival_ptr;
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} compat_sigval_t;
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typedef struct compat_siginfo
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{
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int si_signo;
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int si_errno;
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int si_code;
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union
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{
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int _pad[((128 / sizeof (int)) - 3)];
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/* kill() */
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struct
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{
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unsigned int _pid;
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unsigned int _uid;
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} _kill;
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/* POSIX.1b timers */
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struct
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{
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compat_timer_t _tid;
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int _overrun;
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compat_sigval_t _sigval;
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} _timer;
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/* POSIX.1b signals */
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struct
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{
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unsigned int _pid;
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unsigned int _uid;
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compat_sigval_t _sigval;
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} _rt;
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/* SIGCHLD */
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struct
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{
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unsigned int _pid;
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unsigned int _uid;
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int _status;
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compat_clock_t _utime;
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compat_clock_t _stime;
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} _sigchld;
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/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
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struct
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{
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unsigned int _addr;
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short int _addr_lsb;
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struct
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{
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unsigned int _lower;
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unsigned int _upper;
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} si_addr_bnd;
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} _sigfault;
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/* SIGPOLL */
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struct
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{
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int _band;
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int _fd;
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} _sigpoll;
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} _sifields;
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} compat_siginfo_t;
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/* For x32, clock_t in _sigchld is 64bit aligned at 4 bytes. */
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typedef long __attribute__ ((__aligned__ (4))) compat_x32_clock_t;
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typedef struct compat_x32_siginfo
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{
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int si_signo;
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int si_errno;
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int si_code;
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union
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{
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int _pad[((128 / sizeof (int)) - 3)];
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/* kill() */
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struct
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{
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unsigned int _pid;
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unsigned int _uid;
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} _kill;
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/* POSIX.1b timers */
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struct
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{
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compat_timer_t _tid;
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int _overrun;
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compat_sigval_t _sigval;
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} _timer;
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/* POSIX.1b signals */
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struct
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{
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unsigned int _pid;
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unsigned int _uid;
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compat_sigval_t _sigval;
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} _rt;
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/* SIGCHLD */
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struct
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{
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unsigned int _pid;
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unsigned int _uid;
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int _status;
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compat_x32_clock_t _utime;
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compat_x32_clock_t _stime;
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} _sigchld;
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/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
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struct
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{
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unsigned int _addr;
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unsigned int _addr_lsb;
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} _sigfault;
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/* SIGPOLL */
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struct
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{
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int _band;
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int _fd;
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} _sigpoll;
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} _sifields;
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} compat_x32_siginfo_t __attribute__ ((__aligned__ (8)));
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/* To simplify usage of siginfo fields. */
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#define cpt_si_pid _sifields._kill._pid
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#define cpt_si_uid _sifields._kill._uid
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#define cpt_si_timerid _sifields._timer._tid
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#define cpt_si_overrun _sifields._timer._overrun
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#define cpt_si_status _sifields._sigchld._status
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#define cpt_si_utime _sifields._sigchld._utime
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#define cpt_si_stime _sifields._sigchld._stime
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#define cpt_si_ptr _sifields._rt._sigval.sival_ptr
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#define cpt_si_addr _sifields._sigfault._addr
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#define cpt_si_addr_lsb _sifields._sigfault._addr_lsb
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#define cpt_si_band _sifields._sigpoll._band
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#define cpt_si_fd _sifields._sigpoll._fd
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/* glibc at least up to 2.3.2 doesn't have si_timerid, si_overrun.
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In their place is si_timer1,si_timer2. */
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#ifndef si_timerid
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#define si_timerid si_timer1
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#endif
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#ifndef si_overrun
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#define si_overrun si_timer2
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#endif
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/* The type of the siginfo object the kernel returns in
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PTRACE_GETSIGINFO. If gdb is built as a x32 program, we get a x32
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siginfo. */
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#ifdef __ILP32__
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typedef compat_x32_siginfo_t ptrace_siginfo_t;
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#else
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typedef nat_siginfo_t ptrace_siginfo_t;
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#endif
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/* Convert the system provided siginfo into compatible siginfo. */
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static void
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compat_siginfo_from_siginfo (compat_siginfo_t *to, const siginfo_t *from)
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{
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ptrace_siginfo_t from_ptrace;
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memcpy (&from_ptrace, from, sizeof (from_ptrace));
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memset (to, 0, sizeof (*to));
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to->si_signo = from_ptrace.si_signo;
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to->si_errno = from_ptrace.si_errno;
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to->si_code = from_ptrace.si_code;
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if (to->si_code == SI_TIMER)
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{
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to->cpt_si_timerid = from_ptrace.cpt_si_timerid;
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to->cpt_si_overrun = from_ptrace.cpt_si_overrun;
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to->cpt_si_ptr = from_ptrace.cpt_si_ptr;
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}
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else if (to->si_code == SI_USER)
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{
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to->cpt_si_pid = from_ptrace.cpt_si_pid;
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to->cpt_si_uid = from_ptrace.cpt_si_uid;
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}
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else if (to->si_code < 0)
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{
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to->cpt_si_pid = from_ptrace.cpt_si_pid;
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to->cpt_si_uid = from_ptrace.cpt_si_uid;
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to->cpt_si_ptr = from_ptrace.cpt_si_ptr;
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}
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else
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{
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switch (to->si_signo)
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{
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case SIGCHLD:
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to->cpt_si_pid = from_ptrace.cpt_si_pid;
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to->cpt_si_uid = from_ptrace.cpt_si_uid;
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to->cpt_si_status = from_ptrace.cpt_si_status;
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to->cpt_si_utime = from_ptrace.cpt_si_utime;
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to->cpt_si_stime = from_ptrace.cpt_si_stime;
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break;
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case SIGILL:
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case SIGFPE:
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case SIGSEGV:
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case SIGBUS:
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to->cpt_si_addr = from_ptrace.cpt_si_addr;
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break;
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case SIGPOLL:
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to->cpt_si_band = from_ptrace.cpt_si_band;
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to->cpt_si_fd = from_ptrace.cpt_si_fd;
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break;
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default:
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to->cpt_si_pid = from_ptrace.cpt_si_pid;
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to->cpt_si_uid = from_ptrace.cpt_si_uid;
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to->cpt_si_ptr = from_ptrace.cpt_si_ptr;
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break;
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}
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}
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}
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/* Convert the compatible siginfo into system siginfo. */
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static void
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siginfo_from_compat_siginfo (siginfo_t *to, const compat_siginfo_t *from)
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{
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ptrace_siginfo_t to_ptrace;
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memset (&to_ptrace, 0, sizeof (to_ptrace));
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to_ptrace.si_signo = from->si_signo;
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to_ptrace.si_errno = from->si_errno;
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to_ptrace.si_code = from->si_code;
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if (to_ptrace.si_code == SI_TIMER)
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{
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to_ptrace.cpt_si_timerid = from->cpt_si_timerid;
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to_ptrace.cpt_si_overrun = from->cpt_si_overrun;
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to_ptrace.cpt_si_ptr = from->cpt_si_ptr;
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}
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else if (to_ptrace.si_code == SI_USER)
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{
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to_ptrace.cpt_si_pid = from->cpt_si_pid;
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to_ptrace.cpt_si_uid = from->cpt_si_uid;
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}
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if (to_ptrace.si_code < 0)
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{
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to_ptrace.cpt_si_pid = from->cpt_si_pid;
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to_ptrace.cpt_si_uid = from->cpt_si_uid;
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to_ptrace.cpt_si_ptr = from->cpt_si_ptr;
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}
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else
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{
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switch (to_ptrace.si_signo)
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{
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case SIGCHLD:
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to_ptrace.cpt_si_pid = from->cpt_si_pid;
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to_ptrace.cpt_si_uid = from->cpt_si_uid;
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to_ptrace.cpt_si_status = from->cpt_si_status;
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to_ptrace.cpt_si_utime = from->cpt_si_utime;
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to_ptrace.cpt_si_stime = from->cpt_si_stime;
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break;
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case SIGILL:
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case SIGFPE:
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case SIGSEGV:
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case SIGBUS:
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to_ptrace.cpt_si_addr = from->cpt_si_addr;
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to_ptrace.cpt_si_addr_lsb = from->cpt_si_addr_lsb;
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break;
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case SIGPOLL:
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to_ptrace.cpt_si_band = from->cpt_si_band;
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to_ptrace.cpt_si_fd = from->cpt_si_fd;
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break;
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default:
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to_ptrace.cpt_si_pid = from->cpt_si_pid;
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to_ptrace.cpt_si_uid = from->cpt_si_uid;
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to_ptrace.cpt_si_ptr = from->cpt_si_ptr;
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break;
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}
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}
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memcpy (to, &to_ptrace, sizeof (to_ptrace));
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}
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/* Convert the system provided siginfo into compatible x32 siginfo. */
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static void
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compat_x32_siginfo_from_siginfo (compat_x32_siginfo_t *to,
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const siginfo_t *from)
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{
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ptrace_siginfo_t from_ptrace;
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memcpy (&from_ptrace, from, sizeof (from_ptrace));
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memset (to, 0, sizeof (*to));
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to->si_signo = from_ptrace.si_signo;
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to->si_errno = from_ptrace.si_errno;
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to->si_code = from_ptrace.si_code;
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if (to->si_code == SI_TIMER)
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{
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to->cpt_si_timerid = from_ptrace.cpt_si_timerid;
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to->cpt_si_overrun = from_ptrace.cpt_si_overrun;
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to->cpt_si_ptr = from_ptrace.cpt_si_ptr;
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}
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else if (to->si_code == SI_USER)
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{
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to->cpt_si_pid = from_ptrace.cpt_si_pid;
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to->cpt_si_uid = from_ptrace.cpt_si_uid;
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}
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else if (to->si_code < 0)
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{
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to->cpt_si_pid = from_ptrace.cpt_si_pid;
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to->cpt_si_uid = from_ptrace.cpt_si_uid;
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to->cpt_si_ptr = from_ptrace.cpt_si_ptr;
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}
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else
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{
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switch (to->si_signo)
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{
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case SIGCHLD:
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to->cpt_si_pid = from_ptrace.cpt_si_pid;
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to->cpt_si_uid = from_ptrace.cpt_si_uid;
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to->cpt_si_status = from_ptrace.cpt_si_status;
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memcpy (&to->cpt_si_utime, &from_ptrace.cpt_si_utime,
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sizeof (to->cpt_si_utime));
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memcpy (&to->cpt_si_stime, &from_ptrace.cpt_si_stime,
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sizeof (to->cpt_si_stime));
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break;
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case SIGILL:
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case SIGFPE:
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case SIGSEGV:
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case SIGBUS:
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to->cpt_si_addr = from_ptrace.cpt_si_addr;
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break;
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case SIGPOLL:
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to->cpt_si_band = from_ptrace.cpt_si_band;
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to->cpt_si_fd = from_ptrace.cpt_si_fd;
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break;
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default:
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to->cpt_si_pid = from_ptrace.cpt_si_pid;
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to->cpt_si_uid = from_ptrace.cpt_si_uid;
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to->cpt_si_ptr = from_ptrace.cpt_si_ptr;
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break;
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}
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}
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}
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/* Convert the compatible x32 siginfo into system siginfo. */
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static void
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siginfo_from_compat_x32_siginfo (siginfo_t *to,
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const compat_x32_siginfo_t *from)
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{
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ptrace_siginfo_t to_ptrace;
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memset (&to_ptrace, 0, sizeof (to_ptrace));
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to_ptrace.si_signo = from->si_signo;
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to_ptrace.si_errno = from->si_errno;
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to_ptrace.si_code = from->si_code;
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if (to_ptrace.si_code == SI_TIMER)
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{
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to_ptrace.cpt_si_timerid = from->cpt_si_timerid;
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to_ptrace.cpt_si_overrun = from->cpt_si_overrun;
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to_ptrace.cpt_si_ptr = from->cpt_si_ptr;
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}
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else if (to_ptrace.si_code == SI_USER)
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{
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to_ptrace.cpt_si_pid = from->cpt_si_pid;
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to_ptrace.cpt_si_uid = from->cpt_si_uid;
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}
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if (to_ptrace.si_code < 0)
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{
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to_ptrace.cpt_si_pid = from->cpt_si_pid;
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to_ptrace.cpt_si_uid = from->cpt_si_uid;
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to_ptrace.cpt_si_ptr = from->cpt_si_ptr;
|
|
}
|
|
else
|
|
{
|
|
switch (to_ptrace.si_signo)
|
|
{
|
|
case SIGCHLD:
|
|
to_ptrace.cpt_si_pid = from->cpt_si_pid;
|
|
to_ptrace.cpt_si_uid = from->cpt_si_uid;
|
|
to_ptrace.cpt_si_status = from->cpt_si_status;
|
|
memcpy (&to_ptrace.cpt_si_utime, &from->cpt_si_utime,
|
|
sizeof (to_ptrace.cpt_si_utime));
|
|
memcpy (&to_ptrace.cpt_si_stime, &from->cpt_si_stime,
|
|
sizeof (to_ptrace.cpt_si_stime));
|
|
break;
|
|
case SIGILL:
|
|
case SIGFPE:
|
|
case SIGSEGV:
|
|
case SIGBUS:
|
|
to_ptrace.cpt_si_addr = from->cpt_si_addr;
|
|
break;
|
|
case SIGPOLL:
|
|
to_ptrace.cpt_si_band = from->cpt_si_band;
|
|
to_ptrace.cpt_si_fd = from->cpt_si_fd;
|
|
break;
|
|
default:
|
|
to_ptrace.cpt_si_pid = from->cpt_si_pid;
|
|
to_ptrace.cpt_si_uid = from->cpt_si_uid;
|
|
to_ptrace.cpt_si_ptr = from->cpt_si_ptr;
|
|
break;
|
|
}
|
|
}
|
|
memcpy (to, &to_ptrace, sizeof (to_ptrace));
|
|
}
|
|
|
|
/* Convert a ptrace siginfo object, into/from the siginfo in the
|
|
layout of the inferiors' architecture. Returns true if any
|
|
conversion was done; false otherwise. If DIRECTION is 1, then copy
|
|
from INF to PTRACE. If DIRECTION is 0, then copy from NATIVE to
|
|
INF. */
|
|
|
|
int
|
|
amd64_linux_siginfo_fixup_common (siginfo_t *ptrace, gdb_byte *inf,
|
|
int direction,
|
|
enum amd64_siginfo_fixup_mode mode)
|
|
{
|
|
if (mode == FIXUP_32)
|
|
{
|
|
if (direction == 0)
|
|
compat_siginfo_from_siginfo ((struct compat_siginfo *) inf, ptrace);
|
|
else
|
|
siginfo_from_compat_siginfo (ptrace, (struct compat_siginfo *) inf);
|
|
|
|
return 1;
|
|
}
|
|
else if (mode == FIXUP_X32)
|
|
{
|
|
if (direction == 0)
|
|
compat_x32_siginfo_from_siginfo ((struct compat_x32_siginfo *) inf,
|
|
ptrace);
|
|
else
|
|
siginfo_from_compat_x32_siginfo (ptrace,
|
|
(struct compat_x32_siginfo *) inf);
|
|
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Sanity check for the siginfo structure sizes. */
|
|
|
|
gdb_static_assert (sizeof (siginfo_t) == GDB_SI_SIZE);
|
|
#ifndef __ILP32__
|
|
gdb_static_assert (sizeof (nat_siginfo_t) == GDB_SI_SIZE);
|
|
#endif
|
|
gdb_static_assert (sizeof (compat_x32_siginfo_t) == GDB_SI_SIZE);
|
|
gdb_static_assert (sizeof (compat_siginfo_t) == GDB_SI_SIZE);
|
|
gdb_static_assert (sizeof (ptrace_siginfo_t) == GDB_SI_SIZE);
|