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#__clone(func, stack, flags, arg, ptid, tls, ctid)
# a0, a1, a2, a3, a4, a5, a6
# sys_clone(flags, stack, ptid, ctid, tls)
# a0, a1, a2, a3, a4
.global __clone
.hidden __clone
.type __clone,@function
__clone:
bstrins.d $a1, $zero, 3, 0 #stack to 16 align
# Save function pointer and argument pointer on new thread stack
addi.d $a1, $a1, -16
st.d $a0, $a1, 0 # save function pointer
st.d $a3, $a1, 8 # save argument pointer
or $a0, $a2, $zero
or $a2, $a4, $zero
or $a3, $a6, $zero
or $a4, $a5, $zero
ori $a7, $zero, 220
syscall 0 # call clone
beqz $a0, 1f # whether child process
jirl $zero, $ra, 0 # parent process return
1:
ld.d $t8, $sp, 0 # function pointer
ld.d $a0, $sp, 8 # argument pointer
jirl $ra, $t8, 0 # call the user's function
ori $a7, $zero, 93
syscall 0 # child process exit
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