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- .text
- .globl switch_to
- switch_to: # switch_to(from, to)
-
- # save from's registers
- movl 4(%esp), %eax # eax points to from
- popl 0(%eax) # save eip !popl
- movl %esp, 4(%eax) # save esp::context of from
- movl %ebx, 8(%eax) # save ebx::context of from
- movl %ecx, 12(%eax) # save ecx::context of from
- movl %edx, 16(%eax) # save edx::context of from
- movl %esi, 20(%eax) # save esi::context of from
- movl %edi, 24(%eax) # save edi::context of from
- movl %ebp, 28(%eax) # save ebp::context of from
-
- # restore to's registers
- movl 4(%esp), %eax # not 8(%esp): popped return address already
- # eax now points to to
- movl 28(%eax), %ebp # restore ebp::context of to
- movl 24(%eax), %edi # restore edi::context of to
- movl 20(%eax), %esi # restore esi::context of to
- movl 16(%eax), %edx # restore edx::context of to
- movl 12(%eax), %ecx # restore ecx::context of to
- movl 8(%eax), %ebx # restore ebx::context of to
- movl 4(%eax), %esp # restore esp::context of to
-
- pushl 0(%eax) # push eip
-
- ret
-
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