pt-grow-pusha.c

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/** Expand the stack by 32 bytes all at once using the PUSHA
   instruction.
   This must succeed. */
 
#include <string.h>
#include "tests/arc4.h"
#include "tests/cksum.h"
#include "tests/lib.h"
#include "tests/main.h"
 
void
test_main (void)
{
  asm volatile
    ("movl %%esp, %%eax;"        /**< Save a copy of the stack pointer. */
     "andl $0xfffff000, %%esp;"  /**< Move stack pointer to bottom of page. */
     "pushal;"                   /**< Push 32 bytes on stack at once. */
     "movl %%eax, %%esp"         /**< Restore copied stack pointer. */
     : : : "eax");               /**< Tell GCC we destroyed eax. */
}