test/elf64so.asm: demonstrate a case where we bind to the wrong symbol

Show an artificial case where we bind to the wrong symbol, due to the
confusion in the output system between the size of relative symbols
and their position.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/test/elf64so.asm b/test/elf64so.asm
index a6236951bb0495080624075ede90531e468c0acb..f1b2346429f88d32863c5c2bddb2b312068605f9 100644 (file)
--- a/test/elf64so.asm
+++ b/test/elf64so.asm
@@ -32,6 +32,7 @@
          GLOBAL asmstr:data asmstr.end-asmstr ; [2]
          GLOBAL textptr:data 8 ; [2]
          GLOBAL selfptr:data 8 ; [2]
+         GLOBAL useless:data 8 ; [3]
          GLOBAL integer:data 8 ; [3]
          EXTERN printf         ; [10]
          COMMON commvar 8:8    ; [7]
@@ -59,6 +60,8 @@ lrotate:                      ; [1]
 ;; (Large model cannot be linked with other code)
 ;;
 greet_s:
+         ;;  This instruction is useless, this is only a test...
+         cmp qword [rel integer wrt ..got],0
          mov rax,[rel commvar wrt ..got] ; &commvar
          mov rcx,[rax]                   ; commvar
          mov rax,[rel integer wrt ..got] ; &integer
@@ -105,7 +108,9 @@ textptr       dq greet_s wrt ..sym  ; [15]
 selfptr          dq selfptr wrt ..sym  ; [16]
 
          SECTION .bss
-
+; a useless symbol
+useless          resq 1
+       
 ; an integer
 integer          resq 1                ; [3]