6088 - start using setCC instructions

1 files changed, 25 insertions, 0 deletions

diff --git a/apps/ex13.subx b/apps/ex13.subx
new file mode 100644
index 00000000..9e407f32
--- /dev/null
+++ b/apps/ex13.subx
@@ -0,0 +1,25 @@
+# Compare 3 and 3.
+#
+# To run:
+#   $ ./subx translate init.linux examples/ex13.subx -o examples/ex13
+#   $ ./subx run examples/ex13
+# Expected result:
+#   $ echo $?
+#   1
+
+== code
+#   instruction                     effective address                                                   register    displacement    immediate
+# . op          subop               mod             rm32          base        index         scale       r32
+# . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes
+
+Entry:
+    b8/copy-to-eax  3/imm32
+    3d/compare-eax-and  3/imm32
+    0f 94/set-if-=                  3/mod/direct    3/rm32/ebx    .           .             .           .           .               .                 # set ebx to ZF
+    81 4/subop/and                  3/mod/direct    3/rm32/ebx    .           .             .           .           .               0xff/imm32        # AND eax with 0xff
+
+$exit:
+    # exit(ebx)
+    e8/call  syscall_exit/disp32
+
+# . . vim:nowrap:textwidth=0