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d5f999317e
[ upstream commit be5341eb0d ]
There is no real reason to have a separate ASM entry point implementation
for the legacy INT 0x80 syscall emulation on 64-bit.
IDTENTRY provides all the functionality needed with the only difference
that it does not:
- save the syscall number (AX) into pt_regs::orig_ax
- set pt_regs::ax to -ENOSYS
Both can be done safely in the C code of an IDTENTRY before invoking any of
the syscall related functions which depend on this convention.
Aside of ASM code reduction this prepares for detecting and handling a
local APIC injected vector 0x80.
[ kirill.shutemov: More verbose comments ]
Suggested-by: Linus Torvalds <torvalds@linuxfoundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@vger.kernel.org> # v6.0+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
44 lines
1.0 KiB
C
44 lines
1.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_PROTO_H
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#define _ASM_X86_PROTO_H
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#include <asm/ldt.h>
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struct task_struct;
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/* misc architecture specific prototypes */
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void syscall_init(void);
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#ifdef CONFIG_X86_64
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void entry_SYSCALL_64(void);
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void entry_SYSCALL_64_safe_stack(void);
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void entry_SYSRETQ_unsafe_stack(void);
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void entry_SYSRETQ_end(void);
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long do_arch_prctl_64(struct task_struct *task, int option, unsigned long arg2);
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#endif
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#ifdef CONFIG_X86_32
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void entry_INT80_32(void);
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void entry_SYSENTER_32(void);
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void __begin_SYSENTER_singlestep_region(void);
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void __end_SYSENTER_singlestep_region(void);
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#endif
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#ifdef CONFIG_IA32_EMULATION
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void entry_SYSENTER_compat(void);
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void __end_entry_SYSENTER_compat(void);
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void entry_SYSCALL_compat(void);
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void entry_SYSCALL_compat_safe_stack(void);
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void entry_SYSRETL_compat_unsafe_stack(void);
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void entry_SYSRETL_compat_end(void);
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#endif
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void x86_configure_nx(void);
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extern int reboot_force;
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long do_arch_prctl_common(int option, unsigned long arg2);
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#endif /* _ASM_X86_PROTO_H */
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