"推"的操作数类型不匹配

Question

我需要有关使用ASSEMBLY部件的C代码的帮助.GCC编译程序集有问题,错误:

$ make
gcc -Wall -g -std=c99 -pedantic   -c -o sthread.o sthread.c
sthread.c: In function ‘sthread_create’:
sthread.c:159:57: warning: pointer of type ‘void *’ used in arithmetic [-Wpointer-arith]
     t->context = __sthread_initialize_context(t->memory + DEFAULT_STACKSIZE, f, arg);
                                                         ^
gcc -Wall -g -std=c99 -pedantic   -c -o queue.o queue.c
as -g  -o glue.o glue.s
glue.s: Assembler messages:
glue.s:32: Error: operand type mismatch for `push'
<wbudowane>: polecenia dla obiektu 'glue.o' nie powiod?y si?
make: *** [glue.o] B??d 1

有问题的代码:

__sthread_switch:
    # preserve CPU state on the stack, with exception of stack pointer, instruction pointer first, reverse order
    pushq %rip  #line 32
    pushf
    pushq %rdi
    pushq %rsi
    pushq %rbp
    pushq %rbx
    pushq %rdx
    pushq %rcx
    pushq %rax

    # Call the high-level scheduler with the current context as an argument
    movq    %rsp, %rdi
    movq    scheduler_context, %rsp
    call    __sthread_scheduler

Answer 1

随着X86_64你不能推%rip,实际上你根本无法直接访问它.

如果你仍然需要这样做,你可以做到

leaq 0(%rip), %rax # Or any other GPR that is free
pushq %rax 

要么

callq . + 5          # no label, hard-code instruction length
# or
callq 1f ;  1:       # with a local numbered label

虽然我不确定你为什么要隐藏它%rip,如果你从这里恢复它,执行将继续从push指令.这有什么价值吗？您需要重新考虑线程切换逻辑.