115 lines
2.8 KiB
ArmAsm
115 lines
2.8 KiB
ArmAsm
#include <machine/asm.h>
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#include <sys/linux-syscalls.h>
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// int __pthread_clone(int (*fn)(void*), void* tls, int flags, void* arg);
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ENTRY(__pthread_clone)
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pushl %ebx
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pushl %ecx
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movl 16(%esp), %ecx
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# save tls
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movl %ecx, %ebx
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# 16-byte alignment on child stack
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andl $~15, %ecx
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# insert arguments onto the child stack
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movl 12(%esp), %eax
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movl %eax, -16(%ecx)
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movl 24(%esp), %eax
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movl %eax, -12(%ecx)
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movl %ebx, -8(%ecx)
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subl $16, %ecx
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movl 20(%esp), %ebx
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# make system call
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movl $__NR_clone, %eax
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int $0x80
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cmpl $0, %eax
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je pc_child
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jg pc_parent
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# an error occurred, set errno and return -1
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negl %eax
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pushl %eax
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call __set_errno
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addl $4, %esp
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orl $-1, %eax
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jmp pc_return
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pc_child:
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# we're in the child thread now, call __thread_entry
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# with the appropriate arguments on the child stack
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# we already placed most of them
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call __thread_entry
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hlt
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pc_parent:
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# we're the parent; nothing to do.
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pc_return:
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popl %ecx
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popl %ebx
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ret
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END(__pthread_clone)
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/*
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* int __bionic_clone(unsigned long clone_flags,
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* void* newsp,
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* int *parent_tidptr,
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* void *new_tls,
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* int *child_tidptr,
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* int (*fn)(void *),
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* void *arg);
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*/
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ENTRY(__bionic_clone)
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pushl %ebx
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pushl %esi
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pushl %edi
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# insert arguments onto the child stack
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movl 20(%esp), %ecx
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andl $~15, %ecx
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movl 36(%esp), %eax
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movl %eax, -16(%ecx)
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movl 40(%esp), %eax
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movl %eax, -12(%ecx)
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subl $16, %ecx
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movl 16(%esp), %ebx
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movl 24(%esp), %edx
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movl 32(%esp), %esi
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movl 28(%esp), %edi
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# make system call
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movl $__NR_clone, %eax
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int $0x80
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cmpl $0, %eax
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je bc_child
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jg bc_parent
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# an error occurred, set errno and return -1
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negl %eax
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pushl %eax
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call __set_errno
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addl $4, %esp
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orl $-1, %eax
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jmp bc_return
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bc_child:
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# we're in the child now, call __bionic_clone_entry
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# with the appropriate arguments on the child stack
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# we already placed most of them
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call __bionic_clone_entry
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hlt
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bc_parent:
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# we're the parent; nothing to do.
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bc_return:
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popl %edi
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popl %esi
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popl %ebx
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ret
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END(__bionic_clone)
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