Fix handling of 66h prefix on jumps

It turns out that in x86-64 mode, address and operand size overrides are ignored by the processor. (Tested that on a real machine.) Even libopcodes gets this wrong...
2019-01-14 19:53:46 +01:00
parent a799024066
commit 20f6e8c073
3 changed files with 15 additions and 1 deletions
--- a/tests/decode-jmp.txt
+++ b/tests/decode-jmp.txt
@@ -0,0 +1,4 @@
+decode32 e900000000                     [JMP imm4:0x1234005]
+decode32 66e90100                       [JMP imm2:0x4005]
+decode64 e900000000                     [JMP imm8:0x1234005]
+decode64 66e900000000                   [JMP imm8:0x1234006]
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -19,6 +19,7 @@ testcases = [
  ['enter', 'decode-enter.sh'],
  ['imul', 'decode-imul.sh'],
  ['inc', 'decode-inc.sh'],
+  ['jmp', 'decode-jmp.txt'],
  ['movsx', 'decode-movsx.sh'],
  ['ret', 'decode-ret.sh'],