forked from Bananymous/banan-os
56 lines
781 B
ArmAsm
56 lines
781 B
ArmAsm
# uint32_t read_ip()
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.global read_ip
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read_ip:
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popl %eax
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jmp *%eax
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# void start_kernel_thread()
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.global start_kernel_thread
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start_kernel_thread:
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call get_thread_start_sp
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movl %eax, %esp
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# STACK LAYOUT
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# on_exit arg
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# on_exit func
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# entry arg
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# entry func
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movl 4(%esp), %edi
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movl 0(%esp), %esi
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subl $12, %esp
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pushl %edi
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sti
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call *%esi
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addl $16, %esp
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movl 12(%esp), %edi
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movl 8(%esp), %esi
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subl $12, %esp
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pushl %edi
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call *%esi
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addl $16, %esp
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.global start_userspace_thread
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start_userspace_thread:
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call load_thread_sse
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call get_thread_start_sp
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movl %eax, %esp
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# ds, es = user data
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movw $(0x20 | 3), %bx
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movw %bx, %ds
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movw %bx, %es
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# gs = thread local
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movw $(0x30 | 3), %bx
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movw %bx, %gs
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# fs = 0
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xorw %bx, %bx
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movw %bx, %fs
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iret
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