banan-os/kernel/arch/i686/Thread.S

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ArmAsm
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# uint32_t read_ip()
.global read_ip
read_ip:
popl %eax
jmp *%eax
# void start_kernel_thread()
.global start_kernel_thread
start_kernel_thread:
call get_thread_start_sp
movl %eax, %esp
# STACK LAYOUT
# on_exit arg
# on_exit func
# entry arg
# entry func
movl 4(%esp), %edi
movl 0(%esp), %esi
subl $12, %esp
pushl %edi
sti
call *%esi
addl $16, %esp
movl 12(%esp), %edi
movl 8(%esp), %esi
subl $12, %esp
pushl %edi
call *%esi
addl $16, %esp
.global start_userspace_thread
start_userspace_thread:
call get_thread_start_sp
movl %eax, %esp
# STACK LAYOUT
# entry
# argc
# argv
# envp
# userspace stack
call get_userspace_thread_stack_top
movw $(0x20 | 3), %bx
movw %bx, %ds
movw %bx, %es
movw %bx, %fs
movw %bx, %gs
xorw %bx, %bx
popl %edx
popl %esi
popl %edi
popl %ecx
pushl $(0x20 | 3)
pushl %eax
pushl $0x202
pushl $(0x18 | 3)
pushl %ecx
iret