i386 doreti: stop saving/restoring %ecx around calls into C
There is no reason to do this. Instead just calculate it later. Reviewed by: jhb Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D36302
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@ -518,22 +518,21 @@ doreti_exit:
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je doreti_iret_nmi
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cmpl $T_TRCTRAP, TF_TRAPNO(%esp)
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je doreti_iret_nmi
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movl $TF_SZ, %ecx
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testl $PSL_VM,TF_EFLAGS(%esp)
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jz 1f /* PCB_VM86CALL is not set */
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addl $VM86_STACK_SPACE, %ecx
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jmp 2f
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1: testl $SEL_RPL_MASK, TF_CS(%esp)
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jnz 1f /* PCB_VM86CALL is not set */
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testl $SEL_RPL_MASK, TF_CS(%esp)
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jz doreti_popl_fs
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2: movl $handle_ibrs_exit,%eax
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pushl %ecx /* preserve enough call-used regs */
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1: movl $handle_ibrs_exit,%eax
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call *%eax
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movl mds_handler,%eax
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call *%eax
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popl %ecx
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movl %esp, %esi
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movl PCPU(TRAMPSTK), %edx
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subl %ecx, %edx
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movl $TF_SZ, %ecx
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testl $PSL_VM,TF_EFLAGS(%esp)
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jz 2f /* PCB_VM86CALL is not set */
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addl $VM86_STACK_SPACE, %ecx
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2: subl $TF_SZ, %edx
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movl %edx, %edi
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rep; movsb
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movl %edx, %esp
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