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| author | Xu Zhang <xzhang@cs.uic.edu> | 2013-04-10 23:46:56 -0500 |
|---|---|---|
| committer | Ian Campbell <ian.campbell@citrix.com> | 2013-04-22 12:32:11 +0100 |
| commit | 7e84f54da55d7b59ee4469b6a2ee8fe62ea0bca2 (patch) | |
| tree | cdaf66f9c12fefc89ac0093877f5dc1787daa5fc /extras | |
| parent | a76d139f183a20b3d6cbae4259cf0585bf876eb3 (diff) | |
| download | xen-7e84f54da55d7b59ee4469b6a2ee8fe62ea0bca2.tar.gz xen-7e84f54da55d7b59ee4469b6a2ee8fe62ea0bca2.tar.bz2 xen-7e84f54da55d7b59ee4469b6a2ee8fe62ea0bca2.zip | |
mini-os/x86-64 entry: define macros for registers partial save and restore
No functional changes.
For saving and restoring registers rbx, rbp, and r12-r15,
define and use macros SAVE_REST and RESTORE_REST respectively.
Signed-off-by: Xu Zhang <xzhang@cs.uic.edu>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Diffstat (limited to 'extras')
| -rw-r--r-- | extras/mini-os/arch/x86/x86_64.S | 37 |
1 files changed, 22 insertions, 15 deletions
diff --git a/extras/mini-os/arch/x86/x86_64.S b/extras/mini-os/arch/x86/x86_64.S index 79099f1c64..24f35cdbd2 100644 --- a/extras/mini-os/arch/x86/x86_64.S +++ b/extras/mini-os/arch/x86/x86_64.S @@ -59,6 +59,25 @@ NMI_MASK = 0x80000000 addq $9*8+8,%rsp .endm +.macro RESTORE_REST + movq (%rsp),%r15 + movq 1*8(%rsp),%r14 + movq 2*8(%rsp),%r13 + movq 3*8(%rsp),%r12 + movq 4*8(%rsp),%rbp + movq 5*8(%rsp),%rbx + addq $6*8,%rsp +.endm + +.macro SAVE_REST + subq $6*8,%rsp + movq %rbx,5*8(%rsp) + movq %rbp,4*8(%rsp) + movq %r12,3*8(%rsp) + movq %r13,2*8(%rsp) + movq %r14,1*8(%rsp) + movq %r15,(%rsp) +.endm .macro HYPERVISOR_IRET flag testl $NMI_MASK,2*8(%rsp) @@ -173,13 +192,7 @@ scrit: /**** START OF CRITICAL REGION ****/ 14: XEN_LOCKED_BLOCK_EVENTS(%rsi) XEN_PUT_VCPU_INFO(%rsi) - subq $6*8,%rsp - movq %rbx,5*8(%rsp) - movq %rbp,4*8(%rsp) - movq %r12,3*8(%rsp) - movq %r13,2*8(%rsp) - movq %r14,1*8(%rsp) - movq %r15,(%rsp) + SAVE_REST movq %rsp,%rdi # set the argument again jmp 11b ecrit: /**** END OF CRITICAL REGION ****/ @@ -199,14 +212,8 @@ retint_restore_args: HYPERVISOR_IRET 0 -error_exit: - movq (%rsp),%r15 - movq 1*8(%rsp),%r14 - movq 2*8(%rsp),%r13 - movq 3*8(%rsp),%r12 - movq 4*8(%rsp),%rbp - movq 5*8(%rsp),%rbx - addq $6*8,%rsp +error_exit: + RESTORE_REST XEN_BLOCK_EVENTS(%rsi) jmp retint_kernel |