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authorGabe Black <gblack@eecs.umich.edu>2007-10-18 22:41:18 -0700
committerGabe Black <gblack@eecs.umich.edu>2007-10-18 22:41:18 -0700
commit46bd1c99a9fb3099ab9688ce43669cb7bc154a2a (patch)
tree25550c7c88c6e838905c4c2a0260c6f0adee8bc0 /src/arch/x86
parentc526b00b35d7f135aa926186159df396ee41fbd3 (diff)
downloadgem5-46bd1c99a9fb3099ab9688ce43669cb7bc154a2a.tar.xz
X86: Implement the XLAT instruction.
--HG-- extra : convert_revision : 22d7d9e79e722293b4dc1e66d8610301dc04c5fa
Diffstat (limited to 'src/arch/x86')
-rw-r--r--src/arch/x86/isa/decoder/one_byte_opcodes.isa2
-rw-r--r--src/arch/x86/isa/insts/general_purpose/data_conversion/translate.py14
2 files changed, 10 insertions, 6 deletions
diff --git a/src/arch/x86/isa/decoder/one_byte_opcodes.isa b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
index 23ba243fb..483e750b2 100644
--- a/src/arch/x86/isa/decoder/one_byte_opcodes.isa
+++ b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
@@ -463,7 +463,7 @@
0x0: UD2();
default: WarnUnimpl::salc();
}
- 0x7: WarnUnimpl::xlat();
+ 0x7: XLAT();
}
##include "x87.isa"
0x1C: decode OPCODE_OP_BOTTOM3 {
diff --git a/src/arch/x86/isa/insts/general_purpose/data_conversion/translate.py b/src/arch/x86/isa/insts/general_purpose/data_conversion/translate.py
index bb286b976..c2ccb9d19 100644
--- a/src/arch/x86/isa/insts/general_purpose/data_conversion/translate.py
+++ b/src/arch/x86/isa/insts/general_purpose/data_conversion/translate.py
@@ -53,8 +53,12 @@
#
# Authors: Gabe Black
-microcode = ""
-#let {{
-# class XLAT(Inst):
-# "GenFault ${new UnimpInstFault}"
-#}};
+microcode = '''
+def macroop XLAT {
+ zext t1, rax, 8
+ # Here, t1 can be used directly. The value of al is supposed to be treated
+ # as unsigned. Since we zero extended it from 8 bits above and the address
+ # size has to be at least 16 bits, t1 will not be sign extended.
+ ld rax, seg, [1, rbx, t1], dataSize=1
+};
+'''