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Edit File : ucontext.h \| Size : 2.07 KB
/* 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them back to 64-bit mode without killing them, * despite the fact that the SS selector when the signal was raised is * no longer valid.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 */ Back

Edit File : ucontext.h | Size : 2.07 KB

/* 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 */

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