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41a80ca4ae
been disabled on the cmdline - Clarify in detail how /proc/cpuinfo is used on x86 - Fix a theoretical overflow in num_digits() -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEzv7L6UO9uDPlPSfHEsHwGGHeVUoFAmWZbXYACgkQEsHwGGHe VUpvDhAAmyvuYTVxWlCwHVfAfsaP9CczhOVTKy72fAIyTAa93if0pzzgNKd83k3f V1g3e2azk9VBGiRqDrexz3jJ6lKgQ4OUSWC3p+ywI5PuFmOWDZt3Xj4tUb6wTitA 5NuBBue/K1tm5AIXHRRX4b0yGCNQnp1nuuDeSci8R/Y8/41+6S1dxzPd4okVoegj 1Fjkn6l3gfTjW11xXP+OHP758xOvsbO1vFpyQFH+i9gHBructV4AN0UpsIFBOOnX ySaVL5w2bd5bVyRoVcJzVuvBvOnRwyLrTDzOmSqn57xnCL1Yc/YvBU9voLjo99XX GUQRd/ezfwOiKjf4EcomZZDnL3yEDyEm9gcmRvTYCq0OBxEaI0TEtmsF87eQig3e xe4qbiiFGRbTNb7VjxqbELmXgELE8+euv7pk6NgScA2DZP36H1SRDKujU7jIiwBM pKYJZwyTMC9JkJ+u9dqK0vHPihLBowFlXwKunuhCmk5iTmpLtXDo5ItesI29P/6Z viuu4ja07/7t91BEXwWaJjnVlsqfJNY28g5NyPNUhwXBMWEV7bHApUIn4XaRjkj0 wGzjD482+1TkfGHe5uIjM8dY9/+xJY/WIAO22liU4oUbGSmR/tFCwM6ZC4XeJfnP Q5aO9tcQBIrpIZMGMNd+eBvX2AnLFZ80l0iOHPayWBUoyhS8Wm8= =lzR+ -----END PGP SIGNATURE----- Merge tag 'x86_misc_for_v6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull misc x86 updates from Borislav Petkov: - Add an informational message which gets issued when IA32 emulation has been disabled on the cmdline - Clarify in detail how /proc/cpuinfo is used on x86 - Fix a theoretical overflow in num_digits() * tag 'x86_misc_for_v6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/ia32: State that IA32 emulation is disabled Documentation/x86: Document what /proc/cpuinfo is for x86/lib: Fix overflow when counting digits
104 lines
2.0 KiB
C
104 lines
2.0 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 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 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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