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author | Andy Lutomirski <luto@kernel.org> | 2016-04-02 07:01:32 -0700 |
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committer | Ingo Molnar <mingo@kernel.org> | 2016-04-13 11:37:44 +0200 |
commit | 7bbcdb1ca4d2fd69094ee89c18601b396531ca9f (patch) | |
tree | d8a117babfa869335321285012d7862d96bf7af1 /arch/x86/kernel/head_32.S | |
parent | 6aa6dbfced51dec6cde159c6167ad3dad6add823 (diff) | |
download | linux-stable-7bbcdb1ca4d2fd69094ee89c18601b396531ca9f.tar.gz linux-stable-7bbcdb1ca4d2fd69094ee89c18601b396531ca9f.tar.bz2 linux-stable-7bbcdb1ca4d2fd69094ee89c18601b396531ca9f.zip |
x86/head: Pass a real pt_regs and trapnr to early_fixup_exception()
early_fixup_exception() is limited by the fact that it doesn't have a
real struct pt_regs. Change both the 32-bit and 64-bit asm and the
C code to pass and accept a real pt_regs.
Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: KVM list <kvm@vger.kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: xen-devel <Xen-devel@lists.xen.org>
Link: http://lkml.kernel.org/r/e3fb680fcfd5e23e38237e8328b64a25cc121d37.1459605520.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/head_32.S')
-rw-r--r-- | arch/x86/kernel/head_32.S | 74 |
1 files changed, 51 insertions, 23 deletions
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S index 54cdbd2003fe..0904536cd45c 100644 --- a/arch/x86/kernel/head_32.S +++ b/arch/x86/kernel/head_32.S @@ -568,29 +568,64 @@ early_idt_handler_common: je hlt_loop incl %ss:early_recursion_flag - push %eax # 16(%esp) - push %ecx # 12(%esp) - push %edx # 8(%esp) - push %ds # 4(%esp) - push %es # 0(%esp) - movl $(__KERNEL_DS),%eax - movl %eax,%ds - movl %eax,%es + /* The vector number is in pt_regs->gs */ - cmpl $(__KERNEL_CS),32(%esp) + cld + pushl %fs /* pt_regs->fs */ + movw $0, 2(%esp) /* clear high bits (some CPUs leave garbage) */ + pushl %es /* pt_regs->es */ + movw $0, 2(%esp) /* clear high bits (some CPUs leave garbage) */ + pushl %ds /* pt_regs->ds */ + movw $0, 2(%esp) /* clear high bits (some CPUs leave garbage) */ + pushl %eax /* pt_regs->ax */ + pushl %ebp /* pt_regs->bp */ + pushl %edi /* pt_regs->di */ + pushl %esi /* pt_regs->si */ + pushl %edx /* pt_regs->dx */ + pushl %ecx /* pt_regs->cx */ + pushl %ebx /* pt_regs->bx */ + + /* Fix up DS and ES */ + movl $(__KERNEL_DS), %ecx + movl %ecx, %ds + movl %ecx, %es + + /* Load the vector number into EDX */ + movl PT_GS(%esp), %edx + + /* Load GS into pt_regs->gs and clear high bits */ + movw %gs, PT_GS(%esp) + movw $0, PT_GS+2(%esp) + + cmpl $(__KERNEL_CS),PT_CS(%esp) jne 10f - leal 28(%esp),%eax # Pointer to %eip - call early_fixup_exception - andl %eax,%eax - jnz ex_entry /* found an exception entry */ + movl %esp, %eax /* args are pt_regs (EAX), trapnr (EDX) */ + call early_fixup_exception + andl %eax,%eax + jz 10f /* Exception wasn't fixed up */ + + popl %ebx /* pt_regs->bx */ + popl %ecx /* pt_regs->cx */ + popl %edx /* pt_regs->dx */ + popl %esi /* pt_regs->si */ + popl %edi /* pt_regs->di */ + popl %ebp /* pt_regs->bp */ + popl %eax /* pt_regs->ax */ + popl %ds /* pt_regs->ds */ + popl %es /* pt_regs->es */ + popl %fs /* pt_regs->fs */ + popl %gs /* pt_regs->gs */ + decl %ss:early_recursion_flag + addl $4, %esp /* pop pt_regs->orig_ax */ + iret 10: #ifdef CONFIG_PRINTK xorl %eax,%eax - movw %ax,2(%esp) /* clean up the segment values on some cpus */ - movw %ax,6(%esp) - movw %ax,34(%esp) + movw %ax,PT_FS+2(%esp) /* clean up the segment values on some cpus */ + movw %ax,PT_DS+2(%esp) + movw %ax,PT_ES+2(%esp) leal 40(%esp),%eax pushl %eax /* %esp before the exception */ pushl %ebx @@ -608,13 +643,6 @@ hlt_loop: hlt jmp hlt_loop -ex_entry: - pop %es - pop %ds - pop %edx - pop %ecx - pop %eax - decl %ss:early_recursion_flag .Lis_nmi: addl $8,%esp /* drop vector number and error code */ iret |