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| | #__clone(func, stack, flags, arg, ptid, tls, ctid)
# a0, a1, a2, a3, a4, a5, a6
# sys_clone3(struct clone_args *cl_args, size_t size)
# a0 a1
.global __clone
.hidden __clone
.type __clone,@function
__clone:
# 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
li.d $t0, ~0x004000ff # mask CSIGNAL and CLONE_DETACHED
and $t1, $a2, $t0 # cl_args.flags
li.d $t0, 0x000000ff # CSIGNAL
and $t2, $a2, $t0 # cl_args.exit_signal
bstrins.d $sp, $zero, 2, 0 # align stack to 8 bytes
addi.d $sp, $sp, -88 # struct clone_args
st.d $t1, $sp, 0 # flags
st.d $a4, $sp, 8 # pidfd
st.d $a6, $sp, 16 # child_tid
st.d $a4, $sp, 24 # parent_tid
st.d $t2, $sp, 32 # exit_signal
st.d $a1, $sp, 40 # stack
st.d $zero, $sp, 48 # stack_size
st.d $a5, $sp, 56 # tls
st.d $zero, $sp, 64 # set_tid
st.d $zero, $sp, 72 # set_tid_size
st.d $zero, $sp, 80 # cgroup
move $a0, $sp
li.d $a1, 88
li.d $a7, 435 # __NR_clone3
syscall 0 # call clone3
beqz $a0, 1f # whether child process
addi.d $sp, $sp, 88
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
li.d $a7, 93
syscall 0 # child process exit
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