Attachment 302775 Details for Bug 437358 – 0002-Introduce-xen_ia32_syscall.patch

[patch] 0002-Introduce-xen_ia32_syscall.patch

0002-Introduce-xen_ia32_syscall.patch (text/plain), 1.80 KB, created by Mark McLoughlin on 2008-04-17 17:50:25 UTC

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Creator: Mark McLoughlin

Created: 2008-04-17 17:50:25 UTC

Size: 1.80 KB

patch

obsolete

>From 24e2b220bdf922559053add49a61d020bb6a463b Mon Sep 17 00:00:00 2001
>From: Eduardo Habkost <ehabkost@redhat.com>
>Date: Thu, 20 Mar 2008 18:45:57 -0300
>Subject: [PATCH] Introduce xen_ia32_syscall()
>
>Used for ia32 emulation under Xen.
>
>Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
>---
> arch/x86/ia32/ia32entry.S |   23 +++++++++++++++++++++++
> include/asm-x86/proto.h   |    1 +
> 2 files changed, 24 insertions(+), 0 deletions(-)
>
>diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
>index 376b7ba..22ad66f 100644
>--- a/arch/x86/ia32/ia32entry.S
>+++ b/arch/x86/ia32/ia32entry.S
>@@ -276,6 +276,27 @@ ia32_badarg:
> 	jmp ia32_sysret
> 	CFI_ENDPROC
> 
>+
>+#ifdef CONFIG_XEN
>+
>+/* The entry point for Xen IA32 syscall
>+ *
>+ * The stack format is a bit different under Xen, so we restore
>+ * RCX and R11 from the stack and then continue on the standard
>+ * path.
>+ */
>+ENTRY(xen_ia32_syscall)
>+	/* Restore rcx and r11 from stack */
>+	movq (%rsp),%rcx
>+	movq 8(%rsp),%r11
>+	addq $0x10,%rsp /* skip rcx and r11 */
>+
>+	/* Continue on the normal path */
>+	jmp ia32_syscall_after_swapgs
>+
>+#endif
>+
>+
> /* 
>  * Emulated IA32 system calls via int 0x80. 
>  *
>@@ -307,6 +328,8 @@ ENTRY(ia32_syscall)
> 	/*CFI_REL_OFFSET	cs,CS-RIP*/
> 	CFI_REL_OFFSET	rip,RIP-RIP
> 	swapgs
>+
>+ia32_syscall_after_swapgs:
> 	/*
> 	 * No need to follow this irqs on/off section: the syscall
> 	 * disabled irqs and here we enable it straight after entry:
>diff --git a/include/asm-x86/proto.h b/include/asm-x86/proto.h
>index b562df5..6bee0b7 100644
>--- a/include/asm-x86/proto.h
>+++ b/include/asm-x86/proto.h
>@@ -14,6 +14,7 @@ extern void system_call_after_swapgs(void);
> extern void syscall_init(void);
> 
> extern void ia32_syscall(void);
>+extern void xen_ia32_syscall(void);
> extern void ia32_cstar_target(void);
> extern void ia32_sysenter_target(void);
> 
>-- 
>1.5.4.1
>

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