54 lines
1.2 KiB
ArmAsm
54 lines
1.2 KiB
ArmAsm
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.section .text
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.global switchTask
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switchTask:
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pusha
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pushf
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mov %cr3, %eax #Push CR3
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push %eax
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mov 44(%esp), %eax #The first argument, where to save
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mov %ebx, 4(%eax)
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mov %ecx, 8(%eax)
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mov %edx, 12(%eax)
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mov %esi, 16(%eax)
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mov %edi, 20(%eax)
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mov 36(%esp), %ebx #EAX
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mov 40(%esp), %ecx #IP
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mov 20(%esp), %edx #ESP
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add $4, %edx #Remove the return value ;)
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mov 16(%esp), %esi #EBP
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mov 4(%esp), %edi #EFLAGS
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mov %ebx, (%eax)
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mov %edx, 24(%eax)
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mov %esi, 28(%eax)
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mov %ecx, 32(%eax)
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mov %edi, 36(%eax)
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pop %ebx #CR3
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mov %ebx, 40(%eax)
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push %ebx #Goodbye again ;)
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mov 48(%esp), %eax #Now it is the new object
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mov 4(%eax), %ebx #EBX
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mov 8(%eax), %ecx #ECX
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mov 12(%eax), %edx #EDX
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mov 16(%eax), %esi #ESI
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mov 20(%eax), %edi #EDI
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mov 28(%eax), %ebp #EBP
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push %eax
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mov 36(%eax), %eax #EFLAGS
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push %eax
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popf
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pop %eax
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mov 24(%eax), %esp #ESP
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push %eax
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mov 40(%eax), %eax #CR3
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mov %eax, %cr3
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pop %eax
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push %eax
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mov 32(%eax), %eax #EIP
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xchg (%esp), %eax #We do not have any more registers to use as tmp storage
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mov (%eax), %eax #EAX
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ret #This ends all!
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.global readEip
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readEip:
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pop %eax
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jmp %eax
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