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authorGabe Black <gblack@eecs.umich.edu>2007-10-12 20:07:28 -0700
committerGabe Black <gblack@eecs.umich.edu>2007-10-12 20:07:28 -0700
commitd82d3bbda5b5860c5a69816ebbb8ae217c4bcef4 (patch)
tree827bc32c8f5cb848d05a5f909e44fbda6d5a2fad /src
parent9498e536c0231b808669f2bacb4c0628d1ec309a (diff)
downloadgem5-d82d3bbda5b5860c5a69816ebbb8ae217c4bcef4.tar.xz
X86: Implemented LODS.
--HG-- extra : convert_revision : 4bd8f15bbc25f5dce16ea0504ad6dd21805fa56a
Diffstat (limited to 'src')
-rw-r--r--src/arch/x86/isa/decoder/one_byte_opcodes.isa20
-rw-r--r--src/arch/x86/isa/insts/general_purpose/string/load_string.py42
2 files changed, 39 insertions, 23 deletions
diff --git a/src/arch/x86/isa/decoder/one_byte_opcodes.isa b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
index f76912f06..aed7fb7e7 100644
--- a/src/arch/x86/isa/decoder/one_byte_opcodes.isa
+++ b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
@@ -335,17 +335,17 @@
0x6: StringTestInst::CMPS(Yb,Xb);
0x7: StringTestInst::CMPS(Yv,Xv);
}
- 0x15: decode OPCODE_OP_BOTTOM3 {
- 0x0: Inst::TEST(rAb,Ib);
- 0x1: Inst::TEST(rAv,Iz);
- 0x2: StringInst::STOS(Yb);
- 0x3: StringInst::STOS(Yv);
- 0x4: lods_Al_Xb();
- 0x5: lods_rAX_Xv();
- 0x6: StringTestInst::SCAS(Yb);
- 0x7: StringTestInst::SCAS(Yv);
- }
format Inst {
+ 0x15: decode OPCODE_OP_BOTTOM3 {
+ 0x0: TEST(rAb,Ib);
+ 0x1: TEST(rAv,Iz);
+ 0x2: StringInst::STOS(Yb);
+ 0x3: StringInst::STOS(Yv);
+ 0x4: StringInst::LODS(Xb);
+ 0x5: StringInst::LODS(Xv);
+ 0x6: StringTestInst::SCAS(Yb);
+ 0x7: StringTestInst::SCAS(Yv);
+ }
0x16: MOV(Bb,Ib);
0x17: MOV(Bv,Iv);
0x18: decode OPCODE_OP_BOTTOM3 {
diff --git a/src/arch/x86/isa/insts/general_purpose/string/load_string.py b/src/arch/x86/isa/insts/general_purpose/string/load_string.py
index 0f749a273..61525c2f2 100644
--- a/src/arch/x86/isa/insts/general_purpose/string/load_string.py
+++ b/src/arch/x86/isa/insts/general_purpose/string/load_string.py
@@ -53,16 +53,32 @@
#
# Authors: Gabe Black
-microcode = ""
-#let {{
-# class LODS(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class LODSB(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class LODSW(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class LODSD(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class LODSQ(Inst):
-# "GenFault ${new UnimpInstFault}"
-#}};
+microcode = '''
+def macroop LODS_M {
+ # Find the constant we need to either add or subtract from rdi
+ ruflag t0, 10
+ movi t3, t3, dsz, flags=(CEZF,), dataSize=asz
+ subi t4, t0, dsz, dataSize=asz
+ mov t3, t3, t4, flags=(nCEZF,), dataSize=asz
+
+ ld rax, seg, [1, t0, rdi]
+
+ add rdi, rdi, t3, dataSize=asz
+};
+
+def macroop LODS_E_M {
+ # Find the constant we need to either add or subtract from rdi
+ ruflag t0, 10
+ movi t3, t3, dsz, flags=(CEZF,), dataSize=asz
+ subi t4, t0, dsz, dataSize=asz
+ mov t3, t3, t4, flags=(nCEZF,), dataSize=asz
+
+topOfLoop:
+ ld rax, seg, [1, t0, rdi]
+
+ subi rcx, rcx, 1, flags=(EZF,), dataSize=asz
+ add rdi, rdi, t3, dataSize=asz
+ bri t0, label("topOfLoop"), flags=(nCEZF,)
+ fault "NoFault"
+};
+'''