Threading-Synchronization-Library/ec440threads.h at main · TrevorChan1/Threading-Synchronization-Library · GitHub

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#ifndef __EC440THREADS__
#define __EC440THREADS__
/*
 * This file is derived from code provided by Prof. Egele
 */

static unsigned long int ptr_demangle(unsigned long int p)
{
    unsigned long int ret;

    asm("movq %1, %%rax;\n"
        "rorq $0x11, %%rax;"
        "xorq %%fs:0x30, %%rax;"
        "movq %%rax, %0;"
    : "=r"(ret)
    : "r"(p)
    : "%rax"
    );
    return ret;
}

static unsigned long int ptr_mangle(unsigned long int p)
{
    unsigned long int ret;

    asm("movq %1, %%rax;\n"
        "xorq %%fs:0x30, %%rax;"
        "rolq $0x11, %%rax;"
        "movq %%rax, %0;"
    : "=r"(ret)
    : "r"(p)
    : "%rax"
    );
    return ret;
}

static void *start_thunk() {
  asm("popq %%rbp;\n"           //clean up the function prologue
      "movq %%r13, %%rdi;\n"    //put arg in $rdi
      "pushq %%r12;\n"          //push &start_routine
      "retq;\n"                 //return to &start_routine
      :
      :
      : "%rdi"
  );
  __builtin_unreachable();
}

#endif