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Rev 2787 Rev 3425
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              "pushq %1\n"
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              "pushq %1\n"
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              "pushq %2\n"
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              "pushq %2\n"
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              "pushq %3\n"
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              "pushq %3\n"
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              "pushq %4\n"
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              "pushq %4\n"
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              "movq %5, %%rax\n"
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              "movq %5, %%rax\n"
- 
 
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              /* %rdi is defined to hold pcb_ptr - set it to 0 */
- 
 
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              "xorq %%rdi, %%rdi\n"
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              "iretq\n"
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              "iretq\n"
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              : :
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              : :
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              "i" (gdtselector(UDATA_DES) | PL_USER),
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              "i" (gdtselector(UDATA_DES) | PL_USER),
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              "r" (kernel_uarg->uspace_stack+THREAD_STACK_SIZE),
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              "r" (kernel_uarg->uspace_stack+THREAD_STACK_SIZE),
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              "r" (ipl),
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              "r" (ipl),