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|
.global task_pusha
task_pusha:
pushf
push $0x8
push $userfunc
pusha
/*
now stack looks like:
param // esp+48
returnaddy
eflags
code segment
userfunc
eax // rest by popa
ecx
edx
ebx
esp
ebp
esi
edi
*/
mov 48(%esp),%eax // get address of alternative stack where we want to simulate the pusha
mov (%esp),%ecx
mov %ecx,(%eax)
mov 4(%esp),%ecx
mov %ecx,4(%eax)
mov 8(%esp),%ecx
mov %ecx,8(%eax)
mov 12(%esp),%ecx
mov %ecx,12(%eax)
mov 16(%esp),%ecx
mov %ecx,16(%eax)
mov 20(%esp),%ecx
mov %ecx,20(%eax)
mov 24(%esp),%ecx
mov %ecx,24(%eax)
mov 28(%esp),%ecx
mov %ecx,28(%eax)
mov 32(%esp),%ecx
mov %ecx,32(%eax)
mov 36(%esp),%ecx
mov %ecx,36(%eax)
mov 40(%esp),%ecx
mov %ecx,40(%eax)
mov 44(%esp),%ecx
mov %ecx,44(%eax)
pop %eax
pop %eax
pop %eax
popa
ret
|
