use more precise self crash check

diff --git a/loader/emu.c b/loader/emu.c
index 6ddbb4a..8234a14 100644 (file)
--- a/loader/emu.c
+++ b/loader/emu.c
@@ -916,13 +916,18 @@ static void init_linkpage(void)
 
 static void segv_sigaction(int num, siginfo_t *info, void *ctx)
 {
 
 static void segv_sigaction(int num, siginfo_t *info, void *ctx)
 {

+  extern char _init, _end;

   struct ucontext *context = ctx;
   u32 *regs = (u32 *)&context->uc_mcontext.arm_r0;
   u32 *pc = (u32 *)regs[15];
   struct ucontext *context = ctx;
   u32 *regs = (u32 *)&context->uc_mcontext.arm_r0;
   u32 *pc = (u32 *)regs[15];

+  u32 self_start, self_end;

   struct op_context *op_ctx;
   int i, lp_size;
 
   struct op_context *op_ctx;
   int i, lp_size;
 

-  if (((regs[15] ^ (u32)&segv_sigaction) & 0xff000000) == 0 ||         // PC is in our segment or
+  self_start = (u32)&_init & ~0xfff;
+  self_end = (u32)&_end;
+
+  if ((self_start <= regs[15] && regs[15] <= self_end) ||              // PC is in our segment or

       (((regs[15] ^ (u32)g_linkpage) & ~(LINKPAGE_ALLOC - 1)) == 0) || // .. in linkpage
       ((long)info->si_addr & 0xffe00000) != 0x7f000000)                // faulting not where expected
   {
       (((regs[15] ^ (u32)g_linkpage) & ~(LINKPAGE_ALLOC - 1)) == 0) || // .. in linkpage
       ((long)info->si_addr & 0xffe00000) != 0x7f000000)                // faulting not where expected
   {