Commit 2c8a52eb authored by Alexandre Julliard's avatar Alexandre Julliard

Implemented _chkesp, based on a patch by Jon Griffiths.

parent f5be136c
......@@ -18,12 +18,14 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "wine/port.h"
#include <stdlib.h>
#include "msvcrt.h"
#include "msvcrt/stdlib.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
......@@ -97,8 +99,51 @@ void* _lsearch(const void* match, void* start,
/*********************************************************************
* _chkesp (MSVCRT.@)
*
* Trap to a debugger if the value of the stack pointer has changed.
*
* PARAMS
* None.
*
* RETURNS
* Does not return.
*
* NOTES
* This function is available for iX86 only.
*
* When VC++ generates debug code, it stores the value of the stack pointer
* before calling any external function, and checks the value following
* the call. It then calls this function, which will trap if the values are
* not the same. Usually this means that the prototype used to call
* the function is incorrect. It can also mean that the .spec entry has
* the wrong calling convention or parameters.
*/
void _chkesp(void)
{
#ifdef __i386__
# ifdef __GNUC__
__ASM_GLOBAL_FUNC(_chkesp,
"jnz 1f\n\t"
"ret\n"
"1:\tpushl %ebp\n\t"
"movl %esp,%ebp\n\t"
"pushl %eax\n\t"
"pushl %ecx\n\t"
"pushl %edx\n\t"
"call " __ASM_NAME("MSVCRT_chkesp_fail") "\n\t"
"popl %edx\n\t"
"popl %ecx\n\t"
"popl %eax\n\t"
"popl %ebp\n\t"
"ret");
void MSVCRT_chkesp_fail(void)
{
ERR("Stack pointer incorrect after last function call - Bad prototype/spec entry?\n");
DebugBreak();
}
# else /* __GNUC__ */
void _chkesp(void) { }
# endif /* __GNUC__ */
#endif /* __i386__ */
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