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File ucontext.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _ASM_X86_UCONTEXT_H
#define _ASM_X86_UCONTEXT_H

/*
 * Indicates the presence of extended state information in the memory
 * layout pointed by the fpstate pointer in the ucontext's sigcontext
 * struct (uc_mcontext).
 */
#define UC_FP_XSTATE	0x1

#ifdef __x86_64__
/*
 * UC_SIGCONTEXT_SS will be set when delivering 64-bit or x32 signals on
 * kernels that save SS in the sigcontext.  All kernels that set
 * UC_SIGCONTEXT_SS will correctly restore at least the low 32 bits of esp
 * regardless of SS (i.e. they implement espfix).
 *
 * Kernels that set UC_SIGCONTEXT_SS will also set UC_STRICT_RESTORE_SS
 * when delivering a signal that came from 64-bit code.
 *
 * Sigreturn restores SS as follows:
 *
 * if (saved SS is valid || UC_STRICT_RESTORE_SS is set ||
 *     saved CS is not 64-bit)
 *         new SS = saved SS  (will fail IRET and signal if invalid)
 * else
 *         new SS = a flat 32-bit data segment
 *
 * This behavior serves three purposes:
 *
 * - Legacy programs that construct a 64-bit sigcontext from scratch
 *   with zero or garbage in the SS slot (e.g. old CRIU) and call
 *   sigreturn will still work.
 *
 * - Old DOSEMU versions sometimes catch a signal from a segmented
 *   context, delete the old SS segment (with modify_ldt), and change
 *   the saved CS to a 64-bit segment.  These DOSEMU versions expect
 *   sigreturn to send them back to 64-bit mode without killing them,
 *   despite the fact that the SS selector when the signal was raised is
 *   no longer valid.  UC_STRICT_RESTORE_SS will be clear, so the kernel
 *   will fix up SS for these DOSEMU versions.
 *
 * - Old and new programs that catch a signal and return without
 *   modifying the saved context will end up in exactly the state they
 *   started in, even if they were running in a segmented context when
 *   the signal was raised..  Old kernels would lose track of the
 *   previous SS value.
 */
#define UC_SIGCONTEXT_SS	0x2
#define UC_STRICT_RESTORE_SS	0x4
#endif

#include <asm-generic/ucontext.h>

#endif /* _ASM_X86_UCONTEXT_H */

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-10-28 10:57:27
..	DIR	-	drwxr-xr-x	2025-10-28 10:57:27
a.out.h	text/x-c	756 B	-rw-r--r--	2025-10-27 03:42:54
amd_hsmp.h	text/x-c	8.68 KB	-rw-r--r--	2025-10-27 03:42:54
auxvec.h	text/plain	618 B	-rw-r--r--	2025-10-27 03:42:54
bitsperlong.h	text/x-c	321 B	-rw-r--r--	2025-10-27 03:42:54
boot.h	text/plain	323 B	-rw-r--r--	2025-10-27 03:42:54
bootparam.h	text/x-c	7.58 KB	-rw-r--r--	2025-10-27 03:42:54
bpf_perf_event.h	text/x-c	40 B	-rw-r--r--	2025-10-27 03:42:54
byteorder.h	text/x-c	176 B	-rw-r--r--	2025-10-27 03:42:54
debugreg.h	text/plain	3.25 KB	-rw-r--r--	2025-10-27 03:42:54
e820.h	text/x-c	2.52 KB	-rw-r--r--	2025-10-27 03:42:54
errno.h	text/x-c	31 B	-rw-r--r--	2025-10-27 03:42:54
fcntl.h	text/x-c	31 B	-rw-r--r--	2025-10-27 03:42:54
hw_breakpoint.h	text/plain	69 B	-rw-r--r--	2025-10-27 03:42:54
hwcap2.h	text/plain	270 B	-rw-r--r--	2025-10-27 03:42:54
ioctl.h	text/x-c	31 B	-rw-r--r--	2025-10-27 03:42:54
ioctls.h	text/x-c	32 B	-rw-r--r--	2025-10-27 03:42:54
ipcbuf.h	text/x-c	32 B	-rw-r--r--	2025-10-27 03:42:54
ist.h	text/x-c	854 B	-rw-r--r--	2025-10-27 03:42:54
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kvm_para.h	text/x-c	4.24 KB	-rw-r--r--	2025-10-27 03:42:54
kvm_perf.h	text/x-c	388 B	-rw-r--r--	2025-10-27 03:42:54
ldt.h	text/x-c	1.28 KB	-rw-r--r--	2025-10-27 03:42:54
mce.h	text/x-c	1.65 KB	-rw-r--r--	2025-10-27 03:42:54
mman.h	text/x-c	1002 B	-rw-r--r--	2025-10-27 03:42:54
msgbuf.h	text/x-c	1.03 KB	-rw-r--r--	2025-10-27 03:42:54
msr.h	text/x-c	346 B	-rw-r--r--	2025-10-27 03:42:54
mtrr.h	text/x-c	4.13 KB	-rw-r--r--	2025-10-27 03:42:54
param.h	text/x-c	31 B	-rw-r--r--	2025-10-27 03:42:54
perf_regs.h	text/plain	1.37 KB	-rw-r--r--	2025-10-27 03:42:54
poll.h	text/x-c	30 B	-rw-r--r--	2025-10-27 03:42:54
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posix_types_x32.h	text/x-c	581 B	-rw-r--r--	2025-10-27 03:42:54
prctl.h	text/plain	618 B	-rw-r--r--	2025-10-27 03:42:54
processor-flags.h	text/x-c	6.47 KB	-rw-r--r--	2025-10-27 03:42:54
ptrace-abi.h	text/x-c	1.99 KB	-rw-r--r--	2025-10-27 03:42:54
ptrace.h	text/x-c	1.46 KB	-rw-r--r--	2025-10-27 03:42:54
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setup.h	text/plain	6 B	-rw-r--r--	2025-10-27 03:42:54
sgx.h	text/x-c	8.15 KB	-rw-r--r--	2025-10-27 03:42:54
shmbuf.h	text/x-c	1.23 KB	-rw-r--r--	2025-10-27 03:42:54
sigcontext.h	text/x-c	9.5 KB	-rw-r--r--	2025-10-27 03:42:54
sigcontext32.h	text/x-c	247 B	-rw-r--r--	2025-10-27 03:42:54
siginfo.h	text/x-c	422 B	-rw-r--r--	2025-10-27 03:42:54
signal.h	text/x-c	2.83 KB	-rw-r--r--	2025-10-27 03:42:54
socket.h	text/x-c	32 B	-rw-r--r--	2025-10-27 03:42:54
sockios.h	text/x-c	33 B	-rw-r--r--	2025-10-27 03:42:54
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statfs.h	text/x-c	416 B	-rw-r--r--	2025-10-27 03:42:54
svm.h	text/plain	9.54 KB	-rw-r--r--	2025-10-27 03:42:54
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termios.h	text/x-c	33 B	-rw-r--r--	2025-10-27 03:42:54
types.h	text/x-c	152 B	-rw-r--r--	2025-10-27 03:42:54
ucontext.h	text/x-c	2.07 KB	-rw-r--r--	2025-10-27 03:42:54
unistd.h	text/plain	359 B	-rw-r--r--	2025-10-27 03:42:54
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vm86.h	text/x-c	3.04 KB	-rw-r--r--	2025-10-27 03:42:54
vmx.h	text/x-Algol68	7.2 KB	-rw-r--r--	2025-10-27 03:42:54
vsyscall.h	text/plain	263 B	-rw-r--r--	2025-10-27 03:42:54

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