Linker 共享对象的FreeBSD运行时加载地址

在linux中，在文件dl machine.h中，下面有一个函数用于获取共享对象的运行时加载地址。这在FreeBSD中也会起作用吗？还是有不同的方法

/* Return the run-time load address of the shared object.  */
static inline ElfW(Addr) __attribute__ ((unused))
elf_machine_load_address (void)
{
  ElfW(Addr) addr;

  /* The easy way is just the same as on x86:
   leaq _dl_start, %0
   leaq _dl_start(%%rip), %1
   subq %0, %1
 but this does not work with binutils since we then have
 a R_X86_64_32S relocation in a shared lib.

 Instead we store the address of _dl_start in the data section
 and compare it with the current value that we can get via
 an RIP relative addressing mode.  Note that this is the address
 of _dl_start before any relocation performed at runtime.  In case
 the binary is prelinked the resulting "address" is actually a
 load offset which is zero if the binary was loaded at the address
 it is prelinked for.  */

  asm ("lea _dl_start(%%rip), %0\n\t"
   "sub 1f(%%rip), %0\n\t"
   ".section\t.data.rel.ro\n"
   "1:\t" ASM_ADDR " _dl_start\n\t"
   ".previous\n\t"
   : "=r" (addr) : : "cc");

  return addr;
}

---

FreeBSD上不存在文件

dl machine.h

（至少在10.1 amd64上不存在）

在FreeBSD上，就像在Linux上一样，您可以使用获取共享对象中符号的地址

主要区别在于FreeBSD还提供了

dlfunc

来获取函数的地址，而无需编译器警告。

您可以使用

dladdr（）

来获取共享对象的基址，该地址给定于对象的其他位置。如果您是从共享对象中的代码中调用函数，这非常简单