diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/x86/xen/xen-asm_64.S')
| -rw-r--r-- | ANDROID_3.4.5/arch/x86/xen/xen-asm_64.S | 159 |
1 files changed, 0 insertions, 159 deletions
diff --git a/ANDROID_3.4.5/arch/x86/xen/xen-asm_64.S b/ANDROID_3.4.5/arch/x86/xen/xen-asm_64.S deleted file mode 100644 index 53adefda..00000000 --- a/ANDROID_3.4.5/arch/x86/xen/xen-asm_64.S +++ /dev/null @@ -1,159 +0,0 @@ -/* - * Asm versions of Xen pv-ops, suitable for either direct use or - * inlining. The inline versions are the same as the direct-use - * versions, with the pre- and post-amble chopped off. - * - * This code is encoded for size rather than absolute efficiency, with - * a view to being able to inline as much as possible. - * - * We only bother with direct forms (ie, vcpu in pda) of the - * operations here; the indirect forms are better handled in C, since - * they're generally too large to inline anyway. - */ - -#include <asm/errno.h> -#include <asm/percpu.h> -#include <asm/processor-flags.h> -#include <asm/segment.h> - -#include <xen/interface/xen.h> - -#include "xen-asm.h" - -ENTRY(xen_adjust_exception_frame) - mov 8+0(%rsp), %rcx - mov 8+8(%rsp), %r11 - ret $16 - -hypercall_iret = hypercall_page + __HYPERVISOR_iret * 32 -/* - * Xen64 iret frame: - * - * ss - * rsp - * rflags - * cs - * rip <-- standard iret frame - * - * flags - * - * rcx } - * r11 }<-- pushed by hypercall page - * rsp->rax } - */ -ENTRY(xen_iret) - pushq $0 -1: jmp hypercall_iret -ENDPATCH(xen_iret) -RELOC(xen_iret, 1b+1) - -/* - * sysexit is not used for 64-bit processes, so it's only ever used to - * return to 32-bit compat userspace. - */ -ENTRY(xen_sysexit) - pushq $__USER32_DS - pushq %rcx - pushq $X86_EFLAGS_IF - pushq $__USER32_CS - pushq %rdx - - pushq $0 -1: jmp hypercall_iret -ENDPATCH(xen_sysexit) -RELOC(xen_sysexit, 1b+1) - -ENTRY(xen_sysret64) - /* - * We're already on the usermode stack at this point, but - * still with the kernel gs, so we can easily switch back - */ - movq %rsp, PER_CPU_VAR(old_rsp) - movq PER_CPU_VAR(kernel_stack), %rsp - - pushq $__USER_DS - pushq PER_CPU_VAR(old_rsp) - pushq %r11 - pushq $__USER_CS - pushq %rcx - - pushq $VGCF_in_syscall -1: jmp hypercall_iret -ENDPATCH(xen_sysret64) -RELOC(xen_sysret64, 1b+1) - -ENTRY(xen_sysret32) - /* - * We're already on the usermode stack at this point, but - * still with the kernel gs, so we can easily switch back - */ - movq %rsp, PER_CPU_VAR(old_rsp) - movq PER_CPU_VAR(kernel_stack), %rsp - - pushq $__USER32_DS - pushq PER_CPU_VAR(old_rsp) - pushq %r11 - pushq $__USER32_CS - pushq %rcx - - pushq $0 -1: jmp hypercall_iret -ENDPATCH(xen_sysret32) -RELOC(xen_sysret32, 1b+1) - -/* - * Xen handles syscall callbacks much like ordinary exceptions, which - * means we have: - * - kernel gs - * - kernel rsp - * - an iret-like stack frame on the stack (including rcx and r11): - * ss - * rsp - * rflags - * cs - * rip - * r11 - * rsp->rcx - * - * In all the entrypoints, we undo all that to make it look like a - * CPU-generated syscall/sysenter and jump to the normal entrypoint. - */ - -.macro undo_xen_syscall - mov 0*8(%rsp), %rcx - mov 1*8(%rsp), %r11 - mov 5*8(%rsp), %rsp -.endm - -/* Normal 64-bit system call target */ -ENTRY(xen_syscall_target) - undo_xen_syscall - jmp system_call_after_swapgs -ENDPROC(xen_syscall_target) - -#ifdef CONFIG_IA32_EMULATION - -/* 32-bit compat syscall target */ -ENTRY(xen_syscall32_target) - undo_xen_syscall - jmp ia32_cstar_target -ENDPROC(xen_syscall32_target) - -/* 32-bit compat sysenter target */ -ENTRY(xen_sysenter_target) - undo_xen_syscall - jmp ia32_sysenter_target -ENDPROC(xen_sysenter_target) - -#else /* !CONFIG_IA32_EMULATION */ - -ENTRY(xen_syscall32_target) -ENTRY(xen_sysenter_target) - lea 16(%rsp), %rsp /* strip %rcx, %r11 */ - mov $-ENOSYS, %rax - pushq $0 - jmp hypercall_iret -ENDPROC(xen_syscall32_target) -ENDPROC(xen_sysenter_target) - -#endif /* CONFIG_IA32_EMULATION */ |