Changes in kernel/arch/amd64/src/asm.S [45f7449:cb4f078] in mainline

File:

• kernel/arch/amd64/src/asm.S (modified) (2 diffs)

kernel/arch/amd64/src/asm.S

@@ -362 +362 @@
          */
         call syscall_handler
-
-        /*
-         * Test if the saved return address is canonical and not-kernel.
-         * We do this by looking at the 16 most significant bits
-         * of the saved return address (two bytes at offset 6).
-         */
-        testw $0xffff, ISTATE_OFFSET_RIP+6(%rsp)
-        jnz bad_rip 
-
+        
         cli
         
@@ -396 +388 @@
         sysretq
 
-bad_rip:
-        movq %rsp, %rdi
-        movabs $bad_rip_msg, %rsi
-        xorb %al, %al
-        callq fault_from_uspace
-        /* not reached */
-        
-bad_rip_msg:
-        .asciz "Invalid instruction pointer."
-
 /** Print Unicode character to EGA display.
  *