From 997409d3d0bd6894f33e31ced251c0fdf523aa14 Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Tue, 8 Jul 2008 15:07:00 -0700 Subject: [PATCH] xen64: deal with extra words Xen pushes onto exception frames Xen pushes two extra words containing the values of rcx and r11. This pvop hook copies the words back into their appropriate registers, and cleans them off the stack. This leaves the stack in native form, so the normal handler can run unchanged. Signed-off-by: Jeremy Fitzhardinge Cc: Stephen Tweedie Cc: Eduardo Habkost Cc: Mark McLoughlin Signed-off-by: Ingo Molnar --- arch/x86/xen/enlighten.c | 2 +- arch/x86/xen/xen-asm_64.S | 5 +++++ arch/x86/xen/xen-ops.h | 2 ++ 3 files changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index f5e96f7a4c5c..9d94483b3b5e 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -1091,7 +1091,7 @@ static const struct pv_irq_ops xen_irq_ops __initdata = { .safe_halt = xen_safe_halt, .halt = xen_halt, #ifdef CONFIG_X86_64 - .adjust_exception_frame = paravirt_nop, + .adjust_exception_frame = xen_adjust_exception_frame, #endif }; diff --git a/arch/x86/xen/xen-asm_64.S b/arch/x86/xen/xen-asm_64.S index 4ec10827370b..b147b495daef 100644 --- a/arch/x86/xen/xen-asm_64.S +++ b/arch/x86/xen/xen-asm_64.S @@ -133,6 +133,11 @@ check_events: ret #endif +ENTRY(xen_adjust_exception_frame) + mov 8+0(%rsp),%rcx + mov 8+8(%rsp),%r11 + ret $16 + ENTRY(xen_iret) pushq $0 jmp hypercall_page + __HYPERVISOR_iret * 32 diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h index aca4a7803e2c..c4800a2c5a41 100644 --- a/arch/x86/xen/xen-ops.h +++ b/arch/x86/xen/xen-ops.h @@ -67,7 +67,9 @@ DECL_ASM(void, xen_irq_disable_direct, void); DECL_ASM(unsigned long, xen_save_fl_direct, void); DECL_ASM(void, xen_restore_fl_direct, unsigned long); +/* These are not functions, and cannot be called normally */ void xen_iret(void); void xen_sysexit(void); +void xen_adjust_exception_frame(void); #endif /* XEN_OPS_H */ -- GitLab