Commit-ID: d1f7732009e0549eedf8ea1db948dc37be77fd46 Gitweb: https://git.kernel.org/tip/d1f7732009e0549eedf8ea1db948dc37be77fd46 Author: Andy Lutomirski <l...@kernel.org> AuthorDate: Sun, 28 Jan 2018 10:38:49 -0800 Committer: Thomas Gleixner <t...@linutronix.de> CommitDate: Tue, 30 Jan 2018 15:30:36 +0100
x86/entry/64: Push extra regs right away With the fast path removed there is no point in splitting the push of the normal and the extra register set. Just push the extra regs right away. [ tglx: Split out from 'x86/entry/64: Remove the SYSCALL64 fast path' ] Signed-off-by: Andy Lutomirski <l...@kernel.org> Signed-off-by: Thomas Gleixner <t...@linutronix.de> Acked-by: Ingo Molnar <mi...@kernel.org> Cc: Borislav Petkov <b...@alien8.de> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Kernel Hardening <kernel-harden...@lists.openwall.com> Link: https://lkml.kernel.org/r/462dff8d4d64dfbfc851fbf3130641809d980ecd.1517164461.git.l...@kernel.org --- arch/x86/entry/entry_64.S | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index c46c755..c752abe 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -236,13 +236,17 @@ GLOBAL(entry_SYSCALL_64_after_hwframe) pushq %r9 /* pt_regs->r9 */ pushq %r10 /* pt_regs->r10 */ pushq %r11 /* pt_regs->r11 */ - sub $(6*8), %rsp /* pt_regs->bp, bx, r12-15 not saved */ - UNWIND_HINT_REGS extra=0 + pushq %rbx /* pt_regs->rbx */ + pushq %rbp /* pt_regs->rbp */ + pushq %r12 /* pt_regs->r12 */ + pushq %r13 /* pt_regs->r13 */ + pushq %r14 /* pt_regs->r14 */ + pushq %r15 /* pt_regs->r15 */ + UNWIND_HINT_REGS TRACE_IRQS_OFF /* IRQs are off. */ - SAVE_EXTRA_REGS movq %rsp, %rdi call do_syscall_64 /* returns with IRQs disabled */
