diff options
Diffstat (limited to 'libc/arch-x86/bionic/__bionic_clone.S')
| -rw-r--r-- | libc/arch-x86/bionic/__bionic_clone.S | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/libc/arch-x86/bionic/__bionic_clone.S b/libc/arch-x86/bionic/__bionic_clone.S new file mode 100644 index 0000000..eb9f545 --- /dev/null +++ b/libc/arch-x86/bionic/__bionic_clone.S @@ -0,0 +1,54 @@ +#include <asm/unistd.h> +#include <machine/asm.h> + +// pid_t __bionic_clone(int flags, void* child_stack, pid_t* parent_tid, void* tls, pid_t* child_tid, int (*fn)(void*), void* arg); +ENTRY(__bionic_clone) + pushl %ebx + pushl %esi + pushl %edi + + # insert arguments onto the child stack + movl 20(%esp), %ecx + andl $~15, %ecx + movl 36(%esp), %eax + movl %eax, -16(%ecx) + movl 40(%esp), %eax + movl %eax, -12(%ecx) + + subl $16, %ecx + movl 16(%esp), %ebx + movl 24(%esp), %edx + movl 32(%esp), %esi + movl 28(%esp), %edi + + # make system call + movl $__NR_clone, %eax + int $0x80 + + cmpl $0, %eax + je bc_child + jg bc_parent + + # an error occurred, set errno and return -1 + negl %eax + pushl %eax + call __set_errno + addl $4, %esp + orl $-1, %eax + jmp bc_return + +bc_child: + # we're in the child now, call __bionic_clone_entry + # with the appropriate arguments on the child stack + # we already placed most of them + call __bionic_clone_entry + hlt + +bc_parent: + # we're the parent; nothing to do. +bc_return: + popl %edi + popl %esi + popl %ebx + ret +END(__bionic_clone) |