ntdll: Add support for dynamically generated stub entry points on ARM
André Hentschel
nerv at dawncrow.de
Thu Mar 8 15:12:30 CST 2012
---
dlls/ntdll/loader.c | 43 ++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 42 insertions(+), 1 deletions(-)
diff --git a/dlls/ntdll/loader.c b/dlls/ntdll/loader.c
index 381e2ac..5dc7911 100644
--- a/dlls/ntdll/loader.c
+++ b/dlls/ntdll/loader.c
@@ -177,7 +177,7 @@ static inline BOOL call_dll_entry_point( DLLENTRYPROC proc, void *module,
#endif /* __i386__ */
-#if defined(__i386__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__x86_64__) || defined(__arm__)
/*************************************************************************
* stub_entry_point
*
@@ -209,6 +209,19 @@ struct stub
BYTE call; /* call stub_entry_point */
DWORD entry;
};
+#elif defined(__arm__)
+struct stub
+{
+ BYTE ldr_r0[4]; /* ldr r0, $dll */
+ BYTE mov_pc_pc1[4]; /* mov pc,pc */
+ const char *dll;
+ BYTE ldr_r1[4]; /* ldr r1, $name */
+ BYTE mov_pc_pc2[4]; /* mov pc,pc */
+ const char *name;
+ BYTE mov_r2_lr[4]; /* mov r2, lr */
+ BYTE ldr_pc_pc[4]; /* ldr pc, [pc, #-4] */
+ const void* entry;
+};
#else
struct stub
{
@@ -253,6 +266,34 @@ static ULONG_PTR allocate_stub( const char *dll, const char *name )
stub->dll = dll;
stub->call = 0xe8; /* call stub_entry_point */
stub->entry = (BYTE *)stub_entry_point - (BYTE *)(&stub->entry + 1);
+#elif defined(__arm__)
+ stub->ldr_r0[0] = 0x00; /* ldr r0, $dll */
+ stub->ldr_r0[1] = 0x00;
+ stub->ldr_r0[2] = 0x9f;
+ stub->ldr_r0[3] = 0xe5;
+ stub->mov_pc_pc1[0] = 0x0f; /* mov pc,pc */
+ stub->mov_pc_pc1[1] = 0xf0;
+ stub->mov_pc_pc1[2] = 0xa0;
+ stub->mov_pc_pc1[3] = 0xe1;
+ stub->dll = dll;
+ stub->ldr_r1[0] = 0x00; /* ldr r1, $name */
+ stub->ldr_r1[1] = 0x10;
+ stub->ldr_r1[2] = 0x9f;
+ stub->ldr_r1[3] = 0xe5;
+ stub->mov_pc_pc2[0] = 0x0f; /* mov pc,pc */
+ stub->mov_pc_pc2[1] = 0xf0;
+ stub->mov_pc_pc2[2] = 0xa0;
+ stub->mov_pc_pc2[3] = 0xe1;
+ stub->name = name;
+ stub->mov_r2_lr[0] = 0x0e; /* mov r2, lr */
+ stub->mov_r2_lr[1] = 0x20;
+ stub->mov_r2_lr[2] = 0xa0;
+ stub->mov_r2_lr[3] = 0xe1;
+ stub->ldr_pc_pc[0] = 0x04; /* ldr pc, [pc, #-4] */
+ stub->ldr_pc_pc[1] = 0xf0;
+ stub->ldr_pc_pc[2] = 0x1f;
+ stub->ldr_pc_pc[3] = 0xe5;
+ stub->entry = stub_entry_point;
#else
stub->movq_rdi[0] = 0x48; /* movq $dll,%rdi */
stub->movq_rdi[1] = 0xbf;
--
Best Regards, André Hentschel
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