14619d912b
The code to actually handle kernel and event entry/exit using
FRED. It is split up into two files thus:
- entry_64_fred.S contains the actual entrypoints and exit code, and
saves and restores registers.
- entry_fred.c contains the two-level event dispatch code for FRED.
The first-level dispatch is on the event type, and the second-level
is on the event vector.
[ bp: Fold in an allmodconfig clang build fix:
https://lore.kernel.org/r/20240129064521.5168-1-xin3.li@intel.com
and a CONFIG_IA32_EMULATION=n build fix:
https://lore.kernel.org/r/20240127093728.1323-3-xin3.li@intel.com]
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Originally-by: Megha Dey <megha.dey@intel.com>
Co-developed-by: Xin Li <xin3.li@intel.com>
Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Shan Kang <shan.kang@intel.com>
Link: https://lore.kernel.org/r/20231209214214.2932-1-xin3.li@intel.com
103 lines
2 KiB
C
103 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_IA32_H
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#define _ASM_X86_IA32_H
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#ifdef CONFIG_IA32_EMULATION
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#include <linux/compat.h>
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/*
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* 32 bit structures for IA32 support.
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*/
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#include <uapi/asm/sigcontext.h>
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/* signal.h */
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struct ucontext_ia32 {
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unsigned int uc_flags;
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unsigned int uc_link;
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compat_stack_t uc_stack;
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struct sigcontext_32 uc_mcontext;
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compat_sigset_t uc_sigmask; /* mask last for extensibility */
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};
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/* This matches struct stat64 in glibc2.2, hence the absolutely
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* insane amounts of padding around dev_t's.
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*/
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struct stat64 {
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unsigned long long st_dev;
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unsigned char __pad0[4];
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#define STAT64_HAS_BROKEN_ST_INO 1
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unsigned int __st_ino;
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unsigned int st_mode;
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unsigned int st_nlink;
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unsigned int st_uid;
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unsigned int st_gid;
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unsigned long long st_rdev;
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unsigned char __pad3[4];
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long long st_size;
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unsigned int st_blksize;
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long long st_blocks;/* Number 512-byte blocks allocated */
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unsigned st_atime;
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unsigned st_atime_nsec;
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unsigned st_mtime;
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unsigned st_mtime_nsec;
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unsigned st_ctime;
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unsigned st_ctime_nsec;
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unsigned long long st_ino;
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} __attribute__((packed));
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#define IA32_STACK_TOP IA32_PAGE_OFFSET
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#ifdef __KERNEL__
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struct linux_binprm;
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extern int ia32_setup_arg_pages(struct linux_binprm *bprm,
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unsigned long stack_top, int exec_stack);
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struct mm_struct;
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extern void ia32_pick_mmap_layout(struct mm_struct *mm);
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#endif
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extern bool __ia32_enabled;
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static __always_inline bool ia32_enabled(void)
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{
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return __ia32_enabled;
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}
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static inline void ia32_disable(void)
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{
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__ia32_enabled = false;
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}
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#else /* !CONFIG_IA32_EMULATION */
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static __always_inline bool ia32_enabled(void)
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{
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return IS_ENABLED(CONFIG_X86_32);
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}
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static inline void ia32_disable(void) {}
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#endif
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static inline bool ia32_enabled_verbose(void)
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{
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bool enabled = ia32_enabled();
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if (IS_ENABLED(CONFIG_IA32_EMULATION) && !enabled)
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pr_notice_once("32-bit emulation disabled. You can reenable with ia32_emulation=on\n");
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return enabled;
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}
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#endif /* _ASM_X86_IA32_H */
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