forked from Minki/linux
x86/entry/32: Switch INT80 to the new C syscall path
Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/a7e8d8df96838eae3208dd0441023f3ce7a81831.1444091585.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -153,13 +153,13 @@
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#endif /* CONFIG_X86_32_LAZY_GS */
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.macro SAVE_ALL
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.macro SAVE_ALL pt_regs_ax=%eax
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cld
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PUSH_GS
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pushl %fs
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pushl %es
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pushl %ds
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pushl %eax
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pushl \pt_regs_ax
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pushl %ebp
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pushl %edi
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pushl %esi
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@ -370,20 +370,17 @@ ENDPROC(entry_SYSENTER_32)
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# system call handler stub
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ENTRY(entry_INT80_32)
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ASM_CLAC
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pushl %eax # save orig_eax
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SAVE_ALL
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GET_THREAD_INFO(%ebp)
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# system call tracing in operation / emulation
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testl $_TIF_WORK_SYSCALL_ENTRY, TI_flags(%ebp)
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jnz syscall_trace_entry
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cmpl $(NR_syscalls), %eax
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jae syscall_badsys
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syscall_call:
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call *sys_call_table(, %eax, 4)
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syscall_after_call:
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movl %eax, PT_EAX(%esp) # store the return value
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syscall_exit:
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jmp syscall_exit_work
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pushl %eax /* pt_regs->orig_ax */
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SAVE_ALL pt_regs_ax=$-ENOSYS /* save rest, load -ENOSYS into ax */
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/*
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* User mode is traced as though IRQs are on, and the interrupt gate
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* turned them off.
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*/
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TRACE_IRQS_OFF
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movl %esp, %eax
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call do_int80_syscall_32
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restore_all:
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TRACE_IRQS_IRET
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@ -491,11 +488,6 @@ syscall_fault:
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jmp resume_userspace
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END(syscall_fault)
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syscall_badsys:
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movl $-ENOSYS, %eax
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jmp syscall_after_call
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END(syscall_badsys)
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sysenter_badsys:
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movl $-ENOSYS, %eax
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jmp sysenter_after_call
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