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um: Simplify STUB_DATA loading

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As long STUB_DATA fits into 32bits we can use a plain mov.
If it will grow at some point in future we will switch to movabsq.
In any case the code is smaller and more easy to read
than the current one

Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Richard Weinberger 2015-10-26 10:38:27 +01:00
parent 246d254f1a
commit 1b2411c283
1 changed files with 1 additions and 4 deletions
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5
arch/x86/um/stub_64.S
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@ -3,10 +3,7 @@
.section .__syscall_stub, "ax"
.globl batch_syscall_stub
batch_syscall_stub:
mov $(STUB_DATA >> 32), %rbx
sal $32, %rbx
mov $(STUB_DATA & 0xffffffff), %rax
or %rax, %rbx
mov $(STUB_DATA), %rbx
/* load pointer to first operation */
mov %rbx, %rsp
add $0x10, %rsp