1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
.set noreorder
.global __clone
.type __clone,@function
__clone:
# Save function pointer and argument pointer on new thread stack
and $5, $5, -16 # aligning stack to double word
subu $5, $5, 16
sw $4, 0($5) # save function pointer
sw $7, 4($5) # save argument pointer
# Shuffle (fn,sp,fl,arg,ptid,tls,ctid) to (fl,sp,ptid,tls,ctid)
# sys_clone(u64 flags, u64 ustack_base, u64 parent_tidptr, u64 child_tidptr, u64 tls)
move $4, $6
move $6, $8
move $7, $9
move $8, $10
li $2, 6055
syscall
beq $7, $0, 1f
nop
jr $ra
subu $2, $0, $2
1: beq $2, $0, 1f
nop
jr $ra
nop
1: lw $25, 0($sp) # function pointer
lw $4, 4($sp) # argument pointer
jalr $25 # call the user's function
nop
move $4, $2
li $2, 6058
syscall
|
