diff options
Diffstat (limited to 'src/thread/riscv64/clone.s')
-rw-r--r-- | src/thread/riscv64/clone.s | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/thread/riscv64/clone.s b/src/thread/riscv64/clone.s new file mode 100644 index 00000000..db908248 --- /dev/null +++ b/src/thread/riscv64/clone.s @@ -0,0 +1,34 @@ +# __clone(func, stack, flags, arg, ptid, tls, ctid) +# a0, a1, a2, a3, a4, a5, a6 + +# syscall(SYS_clone, flags, stack, ptid, tls, ctid) +# a7 a0, a1, a2, a3, a4 + +.global __clone +.type __clone, %function +__clone: + # Save func and arg to stack + addi a1, a1, -16 + sd a0, 0(a1) + sd a3, 8(a1) + + # Call SYS_clone + mv a0, a2 + mv a2, a4 + mv a3, a5 + mv a4, a6 + li a7, 220 # SYS_clone + ecall + + beqz a0, 1f + # Parent + ret + + # Child +1: ld a1, 0(sp) + ld a0, 8(sp) + jalr a1 + + # Exit + li a7, 93 # SYS_exit + ecall |