ffi_type *result_type;
ffi_closure *cl;
int r, abi;
+ void *code;
n_args = strlen(typeString) - 1;
cif = stgMallocBytes(sizeof(ffi_cif), "createAdjustor");
r = ffi_prep_cif(cif, abi, n_args, result_type, arg_types);
if (r != FFI_OK) barf("ffi_prep_cif failed: %d", r);
- // ToDo: use ffi_closure_alloc()
- cl = allocateExec(sizeof(ffi_closure));
+ cl = allocateExec(sizeof(ffi_closure), &code);
+ if (cl == NULL) {
+ barf("createAdjustor: failed to allocate memory");
+ }
r = ffi_prep_closure(cl, cif, (void*)wptr, hptr/*userdata*/);
if (r != FFI_OK) barf("ffi_prep_closure failed: %d", r);
- return (void*)cl;
+ return (void*)code;
}
#else // To end of file...
)
{
void *adjustor = NULL;
+ void *code;
switch (cconv)
{
<c>: ff e0 jmp %eax # and jump to it.
# the callee cleans up the stack
*/
- adjustor = allocateExec(14);
+ adjustor = allocateExec(14,&code);
{
unsigned char *const adj_code = (unsigned char *)adjustor;
adj_code[0x00] = (unsigned char)0x58; /* popl %eax */
That's (thankfully) the case here with the restricted set of
return types that we support.
*/
- adjustor = allocateExec(17);
+ adjustor = allocateExec(17,&code);
{
unsigned char *const adj_code = (unsigned char *)adjustor;
We offload most of the work to AdjustorAsm.S.
*/
- AdjustorStub *adjustorStub = allocateExec(sizeof(AdjustorStub));
+ AdjustorStub *adjustorStub = allocateExec(sizeof(AdjustorStub),&code);
adjustor = adjustorStub;
extern void adjustorCode(void);
}
if (i < 6) {
- adjustor = allocateExec(0x30);
+ adjustor = allocateExec(0x30,&code);
*(StgInt32 *)adjustor = 0x49c1894d;
*(StgInt32 *)(adjustor+0x4) = 0x8948c889;
}
else
{
- adjustor = allocateExec(0x40);
+ adjustor = allocateExec(0x40,&code);
*(StgInt32 *)adjustor = 0x35ff5141;
*(StgInt32 *)(adjustor+0x4) = 0x00000020;
similarly, and local variables should be accessed via %fp, not %sp. In a
nutshell: This should work! (Famous last words! :-)
*/
- adjustor = allocateExec(4*(11+1));
+ adjustor = allocateExec(4*(11+1),&code);
{
unsigned long *const adj_code = (unsigned long *)adjustor;
4 bytes (getting rid of the nop), hence saving memory. [ccshan]
*/
ASSERT(((StgWord64)wptr & 3) == 0);
- adjustor = allocateExec(48);
+ adjustor = allocateExec(48,&code);
{
StgWord64 *const code = (StgWord64 *)adjustor;
*/
// allocate space for at most 4 insns per parameter
// plus 14 more instructions.
- adjustor = allocateExec(4 * (4*n + 14));
+ adjustor = allocateExec(4 * (4*n + 14),&code);
code = (unsigned*)adjustor;
*code++ = 0x48000008; // b *+8
#ifdef FUNDESCS
adjustorStub = stgMallocBytes(sizeof(AdjustorStub), "createAdjustor");
#else
- adjustorStub = allocateExec(sizeof(AdjustorStub));
+ adjustorStub = allocateExec(sizeof(AdjustorStub),&code);
#endif
adjustor = adjustorStub;
}
/* Have fun! */
- return adjustor;
+ return code;
}
#else
ASSERT(0);
#endif
- *((unsigned char*)ptr) = '\0';
+ // Can't write to this memory, it is only executable:
+ // *((unsigned char*)ptr) = '\0';
freeExec(ptr);
}
#include <stdlib.h>
#include <string.h>
+#include "ffi.h"
+
/*
* All these globals require sm_mutex to access in THREADED_RTS mode.
*/
nat alloc_blocks; /* number of allocate()d blocks since GC */
nat alloc_blocks_lim; /* approximate limit on alloc_blocks */
+static bdescr *exec_block;
+
generation *generations = NULL; /* all the generations */
generation *g0 = NULL; /* generation 0, for convenience */
generation *oldest_gen = NULL; /* oldest generation, for convenience */
alloc_blocks = 0;
alloc_blocks_lim = RtsFlags.GcFlags.minAllocAreaSize;
+ exec_block = NULL;
+
/* Tell GNU multi-precision pkg about our custom alloc functions */
mp_set_memory_functions(stgAllocForGMP, stgReallocForGMP, stgDeallocForGMP);
should be modified to use allocateExec instead of VirtualAlloc.
------------------------------------------------------------------------- */
-static bdescr *exec_block;
+#if defined(linux_HOST_OS)
+
+// On Linux we need to use libffi for allocating executable memory,
+// because it knows how to work around the restrictions put in place
+// by SELinux.
+
+void *allocateExec (nat bytes, void **exec_ret)
+{
+ void **ret, **exec;
+ ACQUIRE_SM_LOCK;
+ ret = ffi_closure_alloc (sizeof(void *) + (size_t)bytes, (void**)&exec);
+ RELEASE_SM_LOCK;
+ if (ret == NULL) return ret;
+ *ret = ret; // save the address of the writable mapping, for freeExec().
+ *exec_ret = exec + 1;
+ return (ret + 1);
+}
+
+// freeExec gets passed the executable address, not the writable address.
+void freeExec (void *addr)
+{
+ void *writable;
+ writable = *((void**)addr - 1);
+ ACQUIRE_SM_LOCK;
+ ffi_closure_free (writable);
+ RELEASE_SM_LOCK
+}
-void *allocateExec (nat bytes)
+#else
+
+void *allocateExec (nat bytes, void **exec_ret)
{
void *ret;
nat n;
exec_block->free += n + 1;
RELEASE_SM_LOCK
+ *exec_ret = ret;
return ret;
}
RELEASE_SM_LOCK
}
+#endif /* mingw32_HOST_OS */
+
/* -----------------------------------------------------------------------------
Debugging