gcc inline-assembly问题

coneagoe 发表于 2011-08-11 16:53

Hi,

我最近在做一个mocking库的移植，GAS我不是很熟悉。编译时有问题，请教各位大侠，谢谢。

源码:#include "Mocker.h"

namespace MockItNow
{
   int g_jumpAddress;

   extern "C" void __declspec(naked) _penter()
   {
         // Prologue
         __asm
         {
            push ebp
            mov ebp, esp
            sub esp, __LOCAL_SIZE
            push eax
            push ebx
            push ecx
            push edx
         }

         int* framePointer;
         __asm mov dword ptr , ebp

         int targetPointer;
         __asm mov , ecx

         {
            int callingFunctionAddress = (*(framePointer + 1) - 5);

            if (Mocker::IsAlive() == false || Mocker::Instance().ShouldStubFunction(callingFunctionAddress, targetPointer) == false)
            {
               // Standard epilogue. Don't stub the function
               __asm
               {
                     pop edx
                     pop ecx
                     pop ebx
                     pop eax
                     mov esp, ebp
                     pop ebp
                     ret
               }
            }

            Mocker::Instance().SetCurrentFunctionAddress(callingFunctionAddress);

            g_jumpAddress = Mocker::Instance().GetFunctionJumpAddress();

            // Non-standard epilogue. Stub the function
            __asm
            {
               pop edx
               pop ecx
               pop ebx
               pop eax
               mov esp, ebp
               pop ebp
               add esp, 4
               jmp g_jumpAddress
            }
         }
   }
}我修改的：1 #include "Mocker.h"
   2
   3 using namespace MockItNow;
   4
   5 int g_jumpAddress;
   6 int * g_pFrame;
   7 int g_targetAddress;
   8
   9 __attribute__((no_instrument_function))
10 void __cyg_profile_func_enter(void * pFun, void * pCallSite);
11
12 __attribute__((no_instrument_function))
13 void __cyg_profile_func_exit(void * pFun, void * pCallSite);
14
15 void __cyg_profile_func_enter(void * pFun, void * pCallSite)
16 {
17 // Prologue
18 asm volatile ("pushl %ebp\n\t"
19       "movl %esp, %ebp\n\t"
20       "subl __LOCAL_SIZE, %esp\n\t"
21       "pushl %eax\n\t"
22       "pushl %ebx\n\t"
23       "pushl %ecx\n\t"
24       "pushl %edx");
25
26 asm volatile ("movl %ebp, $g_pFrame\n\t"
27       "movl %ecx, g_targetAddress");
28
29 {
30       int callingFunctionAddress = (*(g_pFrame + 1) - 5);
31
32       if(Mocker::IsAlive() == false || Mocker::Instance().ShouldStubFunction(callingFunctionAddress, g_targetAddress) == false)
33       {
34          // Standard epilogue. Don't stub the function
35          asm volatile ("popl %edx\n\t"
36             "popl %ecx\n\t"
37             "popl %ebx\n\t"
38             "popl %eax\n\t"
39             "movl %ebp, %esp\n\t"
40             "popl %ebp\n\t"
41             "ret");
42       }
43
44       Mocker::Instance().SetCurrentFunctionAddress(callingFunctionAddress);
45
46       g_jumpAddress = Mocker::Instance().GetFunctionJumpAddress();
47
48       // Non-standard epilogue. Stub the function
49       asm volatile ("popl %edx\n\t"
50          "popl %ecx\n\t"
51          "popl %ebx\n\t"
52          "popl %eax\n\t"
53          "movl %ebp, %esp\n\t"
54          "popl %ebp\n\t"
55          "addl $4, %esp\n\t"
56          "jmp g_jumpAddress");
57 }
58 }
59
60
61 void __cyg_profile_func_exit(void * pFun, void * pCallSite)
62 {
63 // nothing
64 } 编译报错： make: Entering directory `/cygdrive/d/tools/test/MockItNow2/MockItNow'
/bin/sh ./libtool--tag=CXX --mode=compile g++ -DHAVE_CONFIG_H -I. -g -O2 -MT Thunk.lo -MD -MP -MF .deps/Thunk.Tpo -c -o Thunk.lo `test -f 'Win32/Thunk.cpp' || echo './'`Win32/Thunk.cpp
libtool: compile:g++ -DHAVE_CONFIG_H -I. -g -O2 -MT Thunk.lo -MD -MP -MF .deps/Thunk.Tpo -c Win32/Thunk.cpp-DDLL_EXPORT -DPIC -o .libs/Thunk.o
/tmp/ccRfDyJZ.s: Assembler messages:
/tmp/ccRfDyJZ.s:57: Error: operand type mismatch for `mov'
make: *** Error 1
make: Leaving directory `/cygdrive/d/tools/test/MockItNow2/MockItNow'
make: *** Error 2

EricFisher 发表于 2011-08-15 12:48

# /tmp/ccRfDyJZ.s: Assembler messages:
# /tmp/ccRfDyJZ.s:57: Error: operand type mismatch for `mov'

先用 -save-temps 选项把.s文件保存下来，然后看看57行是什么。

coneagoe 发表于 2011-08-17 18:40

回复 2# EricFisher
找到问题了。
asm volatile ("movl %ebp, $g_pFrame\n\t"
"movl %ecx, g_targetAddress");
应该改为：
asm volatile ("movl %ebp, (g_pFrame)\n\t"
"movl %ecx, g_targetAddress");

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gcc inline-assembly问题