# # Copyright (c) 2005 Martin Decky # All rights reserved. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions # are met: # # - Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer. # - Redistributions in binary form must reproduce the above copyright # notice, this list of conditions and the following disclaimer in the # documentation and/or other materials provided with the distribution. # - The name of the author may not be used to endorse or promote products # derived from this software without specific prior written permission. # # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. # #include <abi/asmtool.h> INTEL_CPUID_STANDARD = 1 INTEL_SEP = 11 .text .org 0 ## User-space task entry point # # %edi contains the PCB pointer # SYMBOL(_start) mov %ss, %ax mov %ax, %ds mov %ax, %es mov %ax, %fs # Do not set %gs, it contains descriptor that can see TLS #ifndef PROCESSOR_i486 # Detect the mechanism used for making syscalls movl $(INTEL_CPUID_STANDARD), %eax cpuid bt $(INTEL_SEP), %edx jnc 0f leal __syscall_fast_func, %eax movl $__syscall_fast, (%eax) 0: #endif # # Create the first stack frame. # pushl $0 pushl $0 movl %esp, %ebp # Pass the PCB pointer to __c_start as the first argument pushl %edi call __c_start