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Index: b/grub/asmstub.c
===================================================================
--- a/grub/asmstub.c
+++ b/grub/asmstub.c
@@ -42,6 +42,12 @@
#include <sys/time.h>
#include <termios.h>
#include <signal.h>
+#include <sys/mman.h>
+
+#include <limits.h>
+#ifndef PAGESIZE
+#define PAGESIZE 4096
+#endif
#ifdef __linux__
# include <sys/ioctl.h> /* ioctl */
@@ -148,6 +154,22 @@
assert (grub_scratch_mem == 0);
scratch = malloc (0x100000 + EXTENDED_MEMSIZE + 15);
assert (scratch);
+
+ {
+ char *p;
+ int ret;
+
+ /* Align to a multiple of PAGESIZE, assumed to be a power of two. */
+ p = (char *) (((long) scratch) & ~(PAGESIZE - 1));
+
+ /* The simulated stack needs to be executable, since GCC uses stack
+ * trampolines to implement nested functions.
+ */
+ ret = mprotect (p, 0x100000 + EXTENDED_MEMSIZE + 15,
+ PROT_READ | PROT_WRITE | PROT_EXEC);
+ assert (ret == 0);
+ }
+
grub_scratch_mem = (char *) ((((int) scratch) >> 4) << 4);
/* FIXME: simulate the memory holes using mprot, if available. */
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