404 Not Found

PATH: usr / include / asm

/* 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 *   no longer valid.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 */

[-] prctl.h [edit]
[-] ptrace-abi.h [edit]
[-] bitsperlong.h [edit]
[-] setup.h [edit]
[-] vmx.h [edit]
[-] amd_hsmp.h [edit]
[-] kvm.h [edit]
[-] debugreg.h [edit]
[-] unistd_32.h [edit]
[-] ptrace.h [edit]
[-] a.out.h [edit]
[-] mtrr.h [edit]
[-] posix_types_x32.h [edit]
[-] perf_regs.h [edit]
[-] msr.h [edit]
[-] errno.h [edit]
[-] swab.h [edit]
[-] e820.h [edit]
[-] types.h [edit]
[-] sigcontext.h [edit]
[-] unistd.h [edit]
[-] kvm_perf.h [edit]
[-] hwcap2.h [edit]
[-] posix_types_32.h [edit]
[-] svm.h [edit]
[-] processor-flags.h [edit]
[-] sembuf.h [edit]
[-] posix_types_64.h [edit]
[-] termbits.h [edit]
[-] mce.h [edit]
[-] vm86.h [edit]
[-] bpf_perf_event.h [edit]
[-] posix_types.h [edit]
[+] ..
[-] sigcontext32.h [edit]
[-] stat.h [edit]
[-] auxvec.h [edit]
[-] ldt.h [edit]
[-] sgx.h [edit]
[-] ipcbuf.h [edit]
[-] sockios.h [edit]
[-] ucontext.h [edit]
[-] poll.h [edit]
[-] statfs.h [edit]
[-] bootparam.h [edit]
[-] boot.h [edit]
[-] shmbuf.h [edit]
[-] resource.h [edit]
[-] ioctls.h [edit]
[-] signal.h [edit]
[-] kvm_para.h [edit]
[-] siginfo.h [edit]
[-] ioctl.h [edit]
[-] termios.h [edit]
[-] hw_breakpoint.h [edit]
[-] ist.h [edit]
[-] byteorder.h [edit]
[-] param.h [edit]
[-] msgbuf.h [edit]
[-] unistd_64.h [edit]
[-] socket.h [edit]
[-] unistd_x32.h [edit]
[-] fcntl.h [edit]
[-] mman.h [edit]
[-] vsyscall.h [edit]