diff options
| -rw-r--r-- | arch/x86/entry/ia32entry.S | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/arch/x86/entry/ia32entry.S b/arch/x86/entry/ia32entry.S index d0c7b28d5670..9558dacf32b9 100644 --- a/arch/x86/entry/ia32entry.S +++ b/arch/x86/entry/ia32entry.S @@ -529,14 +529,13 @@ GLOBAL(\label) GLOBAL(stub32_clone) leaq sys_clone(%rip), %rax /* - * 32-bit clone API is clone(..., int tls_val, int *child_tidptr). - * 64-bit clone API is clone(..., int *child_tidptr, int tls_val). - * Native 64-bit kernel's sys_clone() implements the latter. - * We need to swap args here. But since tls_val is in fact ignored - * by sys_clone(), we can get away with an assignment - * (arg4 = arg5) instead of a full swap: + * The 32-bit clone ABI is: clone(..., int tls_val, int *child_tidptr). + * The 64-bit clone ABI is: clone(..., int *child_tidptr, int tls_val). + * + * The native 64-bit kernel's sys_clone() implements the latter, + * so we need to swap arguments here before calling it: */ - mov %r8, %rcx + xchg %r8, %rcx jmp ia32_ptregs_common ALIGN |