diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2023-12-04 11:31:39 +0300 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com> | 2023-12-07 20:51:29 +0300 |
| commit | be5341eb0d43b1e754799498bd2e8756cc167a41 (patch) | |
| tree | c43b402710a38cd0a16cf3706145ce06182f424e /arch/x86/include/asm/proto.h | |
| parent | b82a8dbd3d2f4563156f7150c6f2ecab6e960b30 (diff) | |
| download | linux-be5341eb0d43b1e754799498bd2e8756cc167a41.tar.xz | |
x86/entry: Convert INT 0x80 emulation to IDTENTRY
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+
Diffstat (limited to 'arch/x86/include/asm/proto.h')
| -rw-r--r-- | arch/x86/include/asm/proto.h | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/arch/x86/include/asm/proto.h b/arch/x86/include/asm/proto.h index 4d84122bd643..484f4f0131a5 100644 --- a/arch/x86/include/asm/proto.h +++ b/arch/x86/include/asm/proto.h @@ -32,10 +32,6 @@ void entry_SYSCALL_compat(void); void entry_SYSCALL_compat_safe_stack(void); void entry_SYSRETL_compat_unsafe_stack(void); void entry_SYSRETL_compat_end(void); -void entry_INT80_compat(void); -#ifdef CONFIG_XEN_PV -void xen_entry_INT80_compat(void); -#endif #else /* !CONFIG_IA32_EMULATION */ #define entry_SYSCALL_compat NULL #define entry_SYSENTER_compat NULL |