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authorGabe Black <gblack@eecs.umich.edu>2007-10-19 15:21:16 -0700
committerGabe Black <gblack@eecs.umich.edu>2007-10-19 15:21:16 -0700
commitd8494325f07695e810e51dffbf9daf5145b10d1a (patch)
treed95a813d95614ca535d648ffd4cd770ef41791c2
parent35a8bc56cd1454f6d32ee7d0309f3ce62639f17c (diff)
downloadgem5-d8494325f07695e810e51dffbf9daf5145b10d1a.tar.xz
X86: Implement the PUSHF, POPF, SAHF, and LAHF instructions.
--HG-- extra : convert_revision : 37c63b1133022fa3432888592f8c84785fb95091
-rw-r--r--src/arch/x86/isa/decoder/one_byte_opcodes.isa17
-rw-r--r--src/arch/x86/isa/insts/general_purpose/flags/load_and_store.py32
-rw-r--r--src/arch/x86/isa/insts/general_purpose/flags/push_and_pop.py34
3 files changed, 53 insertions, 30 deletions
diff --git a/src/arch/x86/isa/decoder/one_byte_opcodes.isa b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
index ac714b3ff..62b8c8d59 100644
--- a/src/arch/x86/isa/decoder/one_byte_opcodes.isa
+++ b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
@@ -313,17 +313,18 @@
default: WarnUnimpl::call_far_Ap();
}
0x3: WarnUnimpl::fwait(); //aka wait
- 0x4: WarnUnimpl::pushf_Fv();
- 0x5: WarnUnimpl::popf_Fv();
- //Both of these should be illegal only if CPUID.AHF64=0,
- //according to sandpile.org
+ 0x4: PUSHF();
+ 0x5: POPF();
+ //The 64 bit versions of both of these should be illegal only
+ //if CPUID says it isn't supported. For now, we'll just assume
+ //that it's supported.
0x6: decode MODE_SUBMODE {
- 0x0: UD2();
- default: WarnUnimpl::sahf();
+ 0x0: SAHF_64();
+ default: SAHF();
}
0x7: decode MODE_SUBMODE {
- 0x0: UD2();
- default: WarnUnimpl::lahf();
+ 0x0: LAHF_64();
+ default: LAHF();
}
}
0x14: decode OPCODE_OP_BOTTOM3 {
diff --git a/src/arch/x86/isa/insts/general_purpose/flags/load_and_store.py b/src/arch/x86/isa/insts/general_purpose/flags/load_and_store.py
index c6f279a25..0915bf819 100644
--- a/src/arch/x86/isa/insts/general_purpose/flags/load_and_store.py
+++ b/src/arch/x86/isa/insts/general_purpose/flags/load_and_store.py
@@ -53,10 +53,28 @@
#
# Authors: Gabe Black
-microcode = ""
-#let {{
-# class LAHF(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class SAHF(Inst):
-# "GenFault ${new UnimpInstFault}"
-#}};
+microcode = '''
+def macroop SAHF {
+ # This will fold to ah since this never executes in 64 bit mode.
+ ruflags rsp, dataSize=1
+};
+
+# This is allows the instruction to write to ah in 64 bit mode.
+def macroop SAHF_64 {
+ ruflags t1
+ slli t1, t1, 8
+ mov t1, t1, rax, dataSize=1
+ mov rax, rax, t1, dataSize=2
+};
+
+def macroop LAHF {
+ # This will fold to ah since this never executes in 64 bit mode.
+ wruflags rsp, t0, dataSize=1
+};
+
+# This is allows the instruction to read from ah in 64 bit mode.
+def macroop LAHF_64 {
+ srli t1, rax, 8, dataSize=2
+ wruflags t1, t0, dataSize=1
+};
+'''
diff --git a/src/arch/x86/isa/insts/general_purpose/flags/push_and_pop.py b/src/arch/x86/isa/insts/general_purpose/flags/push_and_pop.py
index dbb6c34c4..87e9ef03a 100644
--- a/src/arch/x86/isa/insts/general_purpose/flags/push_and_pop.py
+++ b/src/arch/x86/isa/insts/general_purpose/flags/push_and_pop.py
@@ -53,18 +53,22 @@
#
# Authors: Gabe Black
-microcode = ""
-#let {{
-# class POPF(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class POPFD(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class POPFQ(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class PUSHF(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class PUSHFD(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class pushfq(Inst):
-# "GenFault ${new UnimpInstFault}"
-#}};
+microcode = '''
+def macroop PUSHF {
+ .adjust_env oszIn64Override
+
+ # This should really read the whole flags register, not just user flags.
+ ruflags t1
+ st t1, ss, [1, t0, rsp], "-env.dataSize"
+ subi rsp, rsp, dsz
+};
+
+def macroop POPF {
+ .adjust_env oszIn64Override
+
+ ld t1, ss, [1, t0, rsp]
+ addi rsp, rsp, dsz
+ # This should really write the whole flags register, not just user flags.
+ wruflags t1, t0
+};
+'''