+ /* For TLS access, we have to do function calls. However, \
+ * we must not lose the original value of: \
+ * rsp, rflags, rax, rbx, rcx, rdx, rsi, rdi, rbp, r8, r9 \
+ * r10, r11, r12, r13, r14, r15, cs, ss \
+ * \
+ * Some registers' original values have already been saved: \
+ * rsp, rflags, rax, rbx, rdi \
+ * \
+ * In addition, the x86-64 ABI says the following registers \
+ * belong to the caller function: \
+ * rbp, rbx, r12, r13, r14, r15 \
+ * \
+ * The following registers should not be changed by the callee: \
+ * cs, ss \
+ * \
+ * Therefore, the following registers must be explicitly \
+ * preserved: \
+ * rcx, rdx, rsi, r8, r9, r10, r11 \
+ */ \
+ "pushq %%rcx\n\t" \
+ "pushq %%rdx\n\t" \
+ "pushq %%rsi\n\t" \
+ "pushq %%r8\n\t" \
+ "pushq %%r9\n\t" \
+ "pushq %%r10\n\t" \
+ "pushq %%r11\n\t" \