mirror of
https://github.com/bminor/binutils-gdb.git
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1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
614 lines
14 KiB
C
614 lines
14 KiB
C
/* Low-level siginfo manipulation for amd64.
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Copyright (C) 2002-2024 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 "gdbsupport/common-defs.h"
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#include <signal.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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union nat_sigval_t
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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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};
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struct nat_siginfo_t
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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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};
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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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union compat_sigval_t
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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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};
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struct compat_siginfo_t
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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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};
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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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struct __attribute__ ((__aligned__ (8))) compat_x32_siginfo_t
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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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};
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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_lower _sifields._sigfault.si_addr_bnd._lower
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#define cpt_si_upper _sifields._sigfault.si_addr_bnd._upper
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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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#ifndef SEGV_BNDERR
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#define SEGV_BNDERR 3
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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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#ifndef __ILP32__
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/* The struct compat_x32_siginfo_t doesn't contain
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cpt_si_lower/cpt_si_upper. */
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else if (to->si_code == SEGV_BNDERR
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&& to->si_signo == SIGSEGV)
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{
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to->cpt_si_addr = from_ptrace.cpt_si_addr;
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to->cpt_si_lower = from_ptrace.cpt_si_lower;
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to->cpt_si_upper = from_ptrace.cpt_si_upper;
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}
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#endif
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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;
|
|
|
|
memset (&to_ptrace, 0, sizeof (to_ptrace));
|
|
to_ptrace.si_signo = from->si_signo;
|
|
to_ptrace.si_errno = from->si_errno;
|
|
to_ptrace.si_code = from->si_code;
|
|
|
|
if (to_ptrace.si_code == SI_TIMER)
|
|
{
|
|
to_ptrace.cpt_si_timerid = from->cpt_si_timerid;
|
|
to_ptrace.cpt_si_overrun = from->cpt_si_overrun;
|
|
to_ptrace.cpt_si_ptr = from->cpt_si_ptr;
|
|
}
|
|
else if (to_ptrace.si_code == SI_USER)
|
|
{
|
|
to_ptrace.cpt_si_pid = from->cpt_si_pid;
|
|
to_ptrace.cpt_si_uid = from->cpt_si_uid;
|
|
}
|
|
if (to_ptrace.si_code < 0)
|
|
{
|
|
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;
|
|
}
|
|
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 ((compat_siginfo_t *) inf, ptrace);
|
|
else
|
|
siginfo_from_compat_siginfo (ptrace, (compat_siginfo_t *) inf);
|
|
|
|
return 1;
|
|
}
|
|
else if (mode == FIXUP_X32)
|
|
{
|
|
if (direction == 0)
|
|
compat_x32_siginfo_from_siginfo ((compat_x32_siginfo_t *) inf,
|
|
ptrace);
|
|
else
|
|
siginfo_from_compat_x32_siginfo (ptrace,
|
|
(compat_x32_siginfo_t *) inf);
|
|
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Sanity check for the siginfo structure sizes. */
|
|
|
|
static_assert (sizeof (siginfo_t) == GDB_SI_SIZE);
|
|
#ifndef __ILP32__
|
|
static_assert (sizeof (nat_siginfo_t) == GDB_SI_SIZE);
|
|
#endif
|
|
static_assert (sizeof (compat_x32_siginfo_t) == GDB_SI_SIZE);
|
|
static_assert (sizeof (compat_siginfo_t) == GDB_SI_SIZE);
|
|
static_assert (sizeof (ptrace_siginfo_t) == GDB_SI_SIZE);
|