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x86/paravirt, 64-bit: add adjust_exception_frame

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64-bit Xen pushes a couple of extra words onto an exception frame.
Add a hook to deal with them.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: xen-devel <xen-devel@lists.xensource.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2008-06-25 00:19:31 -04:00 committed by Ingo Molnar
parent a00394f81f
commit fab58420ac
6 changed files with 20 additions and 0 deletions
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1
arch/x86/kernel/asm-offsets_64.c
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@ -61,6 +61,7 @@ int main(void)
OFFSET(PARAVIRT_PATCH_pv_irq_ops, paravirt_patch_template, pv_irq_ops);
OFFSET(PV_IRQ_irq_disable, pv_irq_ops, irq_disable);
OFFSET(PV_IRQ_irq_enable, pv_irq_ops, irq_enable);
OFFSET(PV_IRQ_adjust_exception_frame, pv_irq_ops, adjust_exception_frame);
OFFSET(PV_CPU_iret, pv_cpu_ops, iret);
OFFSET(PV_CPU_usergs_sysret32, pv_cpu_ops, usergs_sysret32);
OFFSET(PV_CPU_usergs_sysret64, pv_cpu_ops, usergs_sysret64);

2
arch/x86/kernel/entry_64.S
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@ -736,6 +736,7 @@ END(spurious_interrupt)
*/
.macro zeroentry sym
INTR_FRAME
PARAVIRT_ADJUST_EXCEPTION_FRAME
pushq $0 /* push error code/oldrax */
CFI_ADJUST_CFA_OFFSET 8
pushq %rax /* push real oldrax to the rdi slot */
@ -748,6 +749,7 @@ END(spurious_interrupt)
.macro errorentry sym
XCPT_FRAME
PARAVIRT_ADJUST_EXCEPTION_FRAME
pushq %rax
CFI_ADJUST_CFA_OFFSET 8
CFI_REL_OFFSET rax,0

3
arch/x86/kernel/paravirt.c
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@ -296,6 +296,9 @@ struct pv_irq_ops pv_irq_ops = {
.irq_enable = native_irq_enable,
.safe_halt = native_safe_halt,
.halt = native_halt,
#ifdef CONFIG_X86_64
.adjust_exception_frame = paravirt_nop,
#endif
};
struct pv_cpu_ops pv_cpu_ops = {

3
arch/x86/xen/enlighten.c
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@ -1123,6 +1123,9 @@ static const struct pv_irq_ops xen_irq_ops __initdata = {
.irq_enable = xen_irq_enable,
.safe_halt = xen_safe_halt,
.halt = xen_halt,
#ifdef CONFIG_X86_64
.adjust_exception_frame = paravirt_nop,
#endif
};
static const struct pv_apic_ops xen_apic_ops __initdata = {

9
include/asm-x86/paravirt.h
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@ -189,6 +189,10 @@ struct pv_irq_ops {
void (*irq_enable)(void);
void (*safe_halt)(void);
void (*halt)(void);
#ifdef CONFIG_X86_64
void (*adjust_exception_frame)(void);
#endif
};
struct pv_apic_ops {
@ -1544,6 +1548,11 @@ static inline unsigned long __raw_local_irq_save(void)
movq %rax, %rcx; \
xorq %rax, %rax;
#define PARAVIRT_ADJUST_EXCEPTION_FRAME \
PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_adjust_exception_frame), \
CLBR_NONE, \
call PARA_INDIRECT(pv_irq_ops+PV_IRQ_adjust_exception_frame))
#define USERGS_SYSRET64 \
PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64), \
CLBR_NONE, \

2
include/asm-x86/processor.h
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@ -532,6 +532,8 @@ static inline void load_sp0(struct tss_struct *tss,
#define set_iopl_mask native_set_iopl_mask
#define SWAPGS swapgs
#define PARAVIRT_ADJUST_EXCEPTION_FRAME /* */
#endif /* CONFIG_PARAVIRT */
/*