Commit-ID: 8b376fae0514dc7ee04786e2327169e39d12e51b Gitweb: https://git.kernel.org/tip/8b376fae0514dc7ee04786e2327169e39d12e51b Author: Joerg Roedel <[email protected]> AuthorDate: Wed, 18 Jul 2018 11:40:46 +0200 Committer: Thomas Gleixner <[email protected]> CommitDate: Fri, 20 Jul 2018 01:11:38 +0200
x86/entry/32: Introduce SAVE_ALL_NMI and RESTORE_ALL_NMI These macros will be used in the NMI handler code and replace plain SAVE_ALL and RESTORE_REGS there. The NMI-specific CR3-switch will be added to these macros later. Signed-off-by: Joerg Roedel <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Tested-by: Pavel Machek <[email protected]> Cc: "H . Peter Anvin" <[email protected]> Cc: [email protected] Cc: Linus Torvalds <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Josh Poimboeuf <[email protected]> Cc: Juergen Gross <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Jiri Kosina <[email protected]> Cc: Boris Ostrovsky <[email protected]> Cc: Brian Gerst <[email protected]> Cc: David Laight <[email protected]> Cc: Denys Vlasenko <[email protected]> Cc: Eduardo Valentin <[email protected]> Cc: Greg KH <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: Andrea Arcangeli <[email protected]> Cc: Waiman Long <[email protected]> Cc: "David H . Gutteridge" <[email protected]> Cc: [email protected] Link: https://lkml.kernel.org/r/[email protected] --- arch/x86/entry/entry_32.S | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S index a905e6215ea9..763592596727 100644 --- a/arch/x86/entry/entry_32.S +++ b/arch/x86/entry/entry_32.S @@ -181,6 +181,9 @@ .endm +.macro SAVE_ALL_NMI + SAVE_ALL +.endm /* * This is a sneaky trick to help the unwinder find pt_regs on the stack. The * frame pointer is replaced with an encoded pointer to pt_regs. The encoding @@ -227,6 +230,10 @@ POP_GS_EX .endm +.macro RESTORE_ALL_NMI pop=0 + RESTORE_REGS pop=\pop +.endm + .macro CHECK_AND_APPLY_ESPFIX #ifdef CONFIG_X86_ESPFIX32 #define GDT_ESPFIX_SS PER_CPU_VAR(gdt_page) + (GDT_ENTRY_ESPFIX_SS * 8) @@ -1161,7 +1168,7 @@ ENTRY(nmi) #endif pushl %eax # pt_regs->orig_ax - SAVE_ALL + SAVE_ALL_NMI ENCODE_FRAME_POINTER xorl %edx, %edx # zero error code movl %esp, %eax # pt_regs pointer @@ -1189,7 +1196,7 @@ ENTRY(nmi) .Lnmi_return: CHECK_AND_APPLY_ESPFIX - RESTORE_REGS 4 + RESTORE_ALL_NMI pop=4 jmp .Lirq_return #ifdef CONFIG_X86_ESPFIX32 @@ -1205,12 +1212,12 @@ ENTRY(nmi) pushl 16(%esp) .endr pushl %eax - SAVE_ALL + SAVE_ALL_NMI ENCODE_FRAME_POINTER FIXUP_ESPFIX_STACK # %eax == %esp xorl %edx, %edx # zero error code call do_nmi - RESTORE_REGS + RESTORE_ALL_NMI lss 12+4(%esp), %esp # back to espfix stack jmp .Lirq_return #endif
