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On 64-bit kernels, we used to assume that TSS.sp0 was the current top of stack. With the addition of an entry trampoline, this will no longer be the case. Store the current top of stack in TSS.sp1, which is otherwise unused but shares the same cacheline. Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@suse.de> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bpetkov@suse.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David Laight <David.Laight@aculab.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Eduardo Valentin <eduval@amazon.com> Cc: Greg KH <gregkh@linuxfoundation.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Juergen Gross <jgross@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Will Deacon <will.deacon@arm.com> Cc: aliguori@amazon.com Cc: daniel.gruss@iaik.tugraz.at Cc: hughd@google.com Cc: keescook@google.com Link: https://lkml.kernel.org/r/20171204150606.050864668@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#ifndef __LINUX_KBUILD_H
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# error "Please do not build this file directly, build asm-offsets.c instead"
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#endif
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#include <asm/ia32.h>
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#define __SYSCALL_64(nr, sym, qual) [nr] = 1,
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static char syscalls_64[] = {
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#include <asm/syscalls_64.h>
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};
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#define __SYSCALL_I386(nr, sym, qual) [nr] = 1,
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static char syscalls_ia32[] = {
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#include <asm/syscalls_32.h>
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};
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#if defined(CONFIG_KVM_GUEST) && defined(CONFIG_PARAVIRT_SPINLOCKS)
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#include <asm/kvm_para.h>
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#endif
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int main(void)
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{
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#ifdef CONFIG_PARAVIRT
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OFFSET(PV_CPU_usergs_sysret64, pv_cpu_ops, usergs_sysret64);
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OFFSET(PV_CPU_swapgs, pv_cpu_ops, swapgs);
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#ifdef CONFIG_DEBUG_ENTRY
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OFFSET(PV_IRQ_save_fl, pv_irq_ops, save_fl);
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#endif
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BLANK();
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#endif
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#if defined(CONFIG_KVM_GUEST) && defined(CONFIG_PARAVIRT_SPINLOCKS)
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OFFSET(KVM_STEAL_TIME_preempted, kvm_steal_time, preempted);
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BLANK();
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#endif
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#define ENTRY(entry) OFFSET(pt_regs_ ## entry, pt_regs, entry)
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ENTRY(bx);
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ENTRY(cx);
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ENTRY(dx);
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ENTRY(sp);
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ENTRY(bp);
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ENTRY(si);
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ENTRY(di);
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ENTRY(r8);
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ENTRY(r9);
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ENTRY(r10);
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ENTRY(r11);
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ENTRY(r12);
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ENTRY(r13);
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ENTRY(r14);
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ENTRY(r15);
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ENTRY(flags);
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BLANK();
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#undef ENTRY
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#define ENTRY(entry) OFFSET(saved_context_ ## entry, saved_context, entry)
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ENTRY(cr0);
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ENTRY(cr2);
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ENTRY(cr3);
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ENTRY(cr4);
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ENTRY(cr8);
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ENTRY(gdt_desc);
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BLANK();
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#undef ENTRY
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OFFSET(TSS_ist, tss_struct, x86_tss.ist);
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OFFSET(TSS_sp0, tss_struct, x86_tss.sp0);
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OFFSET(TSS_sp1, tss_struct, x86_tss.sp1);
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BLANK();
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#ifdef CONFIG_CC_STACKPROTECTOR
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DEFINE(stack_canary_offset, offsetof(union irq_stack_union, stack_canary));
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BLANK();
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#endif
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DEFINE(__NR_syscall_max, sizeof(syscalls_64) - 1);
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DEFINE(NR_syscalls, sizeof(syscalls_64));
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DEFINE(__NR_syscall_compat_max, sizeof(syscalls_ia32) - 1);
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DEFINE(IA32_NR_syscalls, sizeof(syscalls_ia32));
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return 0;
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}
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