diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0022-x86-entry-64-Push-extra-regs-right-away.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0022-x86-entry-64-Push-extra-regs-right-away.patch | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0022-x86-entry-64-Push-extra-regs-right-away.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0022-x86-entry-64-Push-extra-regs-right-away.patch new file mode 100644 index 00000000..904e0528 --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.9.21/0022-x86-entry-64-Push-extra-regs-right-away.patch @@ -0,0 +1,49 @@ +From c65286e3b8a7060e768c7b7e4c565922c205cb7f Mon Sep 17 00:00:00 2001 +From: Andy Lutomirski <luto@kernel.org> +Date: Sun, 28 Jan 2018 10:38:49 -0800 +Subject: [PATCH 22/42] x86/entry/64: Push extra regs right away + +(cherry picked from commit d1f7732009e0549eedf8ea1db948dc37be77fd46) + +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 <luto@kernel.org> +Signed-off-by: Thomas Gleixner <tglx@linutronix.de> +Acked-by: Ingo Molnar <mingo@kernel.org> +Cc: Borislav Petkov <bp@alien8.de> +Cc: Linus Torvalds <torvalds@linux-foundation.org> +Cc: Kernel Hardening <kernel-hardening@lists.openwall.com> +Link: https://lkml.kernel.org/r/462dff8d4d64dfbfc851fbf3130641809d980ecd.1517164461.git.luto@kernel.org +Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + arch/x86/entry/entry_64.S | 8 ++++++-- + 1 file changed, 6 insertions(+), 2 deletions(-) + +diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S +index 4360253..c915eeb 100644 +--- a/arch/x86/entry/entry_64.S ++++ b/arch/x86/entry/entry_64.S +@@ -177,10 +177,14 @@ GLOBAL(entry_SYSCALL_64_after_swapgs) + 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 */ ++ 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 */ + + /* IRQs are off. */ +- SAVE_EXTRA_REGS + movq %rsp, %rdi + call do_syscall_64 /* returns with IRQs disabled */ + +-- +2.7.4 + |