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X86: Implement STOS.

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--HG--
extra : convert_revision : 95f3bf185f07fe644d6ab96bbb6e598e406b92f4
This commit is contained in:
Gabe Black 2007-10-02 22:02:30 -07:00
parent 2dd65dc254
commit fea7165b55
2 changed files with 47 additions and 15 deletions
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4
src/arch/x86/isa/decoder/one_byte_opcodes.isa
View file

@ -338,8 +338,8 @@
0x15: decode OPCODE_OP_BOTTOM3 {
0x0: Inst::TEST(rAb,Ib);
0x1: Inst::TEST(rAv,Iz);
0x2: stos_Yb_Al();
0x3: stos_Yv_rAX();
0x2: StringInst::STOS(Yb);
0x3: StringInst::STOS(Yv);
0x4: lods_Al_Xb();
0x5: lods_rAX_Xv();
0x6: StringInst::SCAS(Yb);

58
src/arch/x86/isa/insts/general_purpose/string/store_string.py
View file

@ -53,16 +53,48 @@
#
# Authors: Gabe Black
microcode = ""
#let {{
# class STOS(Inst):
# "Add 0 0 0"
# class STOSB(Inst):
# "Add 0 0 0"
# class STOSW(Inst):
# "Add 0 0 0"
# class STOSD(Inst):
# "Add 0 0 0"
# class STOSQ(Inst):
# "Add 0 0 0"
#}};
microcode = '''
def macroop STOS_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
st rax, es, [1, t0, rdi]
add rdi, rdi, t3, dataSize=asz
};
def macroop STOS_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:
st rax, es, [1, t0, rdi]
subi rcx, rcx, 1, flags=(EZF,), dataSize=asz
add rdi, rdi, t3, dataSize=asz
bri t0, label("topOfLoop"), flags=(CSTRZnEZF,)
fault "NoFault"
};
def macroop STOS_N_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:
st rax, es, [1, t0, rdi]
subi rcx, rcx, 1, flags=(EZF,), dataSize=asz
add rdi, rdi, t3, dataSize=asz
bri t0, label("topOfLoop"), flags=(CSTRnZnEZF,)
fault "NoFault"
};
'''