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X86: Implement idiv and propogate the mul corner case fix.

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--HG--
extra : convert_revision : 348aa081067728afa14dc5b609fc7e26dbc5fad5
This commit is contained in:
Gabe Black 2007-09-04 23:23:13 -07:00
parent b0b4038ee9
commit aaee21afdb
2 changed files with 54 additions and 24 deletions
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46
src/arch/x86/isa/decoder/one_byte_opcodes.isa
View file

@ -504,28 +504,30 @@
{{"Tried to execute the rep/repe prefix!"}});
0x4: hlt();
0x5: cmc();
//0x6: group3_Eb();
0x6: decode MODRM_REG {
0x0: Inst::TEST(Eb,Iz);
0x1: Inst::TEST(Eb,Iz);
0x2: Inst::NOT(Eb);
0x3: Inst::NEG(Eb);
0x4: Inst::MUL_B(Eb);
0x5: Inst::IMUL_B(Eb);
//This should be Eb, but it access the entire word value ax.
0x6: Inst::DIV_B(Ew);
0x7: idiv_Eb();
}
//0x7: group3_Ev();
0x7: decode MODRM_REG {
0x0: Inst::TEST(Ev,Iz);
0x1: Inst::TEST(Ev,Iz);
0x2: Inst::NOT(Ev);
0x3: Inst::NEG(Ev);
0x4: Inst::MUL(Ev);
0x5: Inst::IMUL(Ev);
0x6: Inst::DIV(Ev);
0x7: idiv_Ev();
format Inst {
//0x6: group3_Eb();
0x6: decode MODRM_REG {
0x0: TEST(Eb,Iz);
0x1: TEST(Eb,Iz);
0x2: NOT(Eb);
0x3: NEG(Eb);
0x4: MUL_B(Eb);
0x5: IMUL_B(Eb);
//This should be Eb, but it access the entire word value ax.
0x6: DIV_B(Ew);
0x7: IDIV(Eb);
}
//0x7: group3_Ev();
0x7: decode MODRM_REG {
0x0: TEST(Ev,Iz);
0x1: TEST(Ev,Iz);
0x2: NOT(Ev);
0x3: NEG(Ev);
0x4: MUL(Ev);
0x5: IMUL(Ev);
0x6: DIV(Ev);
0x7: IDIV(Ev);
}
}
}
0x1F: decode OPCODE_OP_BOTTOM3 {

32
src/arch/x86/isa/insts/arithmetic/multiply_and_divide.py
View file

@ -134,8 +134,9 @@ def macroop IMUL_B_P
def macroop IMUL_R
{
muleh rdx, rax, reg
muleh t1, rax, reg
mulel rax, rax, reg
mov rdx, rdx, t1
};
def macroop IMUL_M
@ -229,8 +230,9 @@ def macroop DIV_B_P
def macroop DIV_R
{
divr rdx, rax, reg
divr t1, rax, reg
divq rax, rax, reg
mov rdx, rdx, t1
};
def macroop DIV_M
@ -247,6 +249,32 @@ def macroop DIV_P
divr rdx, rax, t1
divq rax, rax, t1
};
#
# Signed division
#
def macroop IDIV_R
{
divr t1, rax, reg
divq rax, rax, reg
mov rdx, rdx, t1
};
def macroop IDIV_M
{
ld t1, seg, sib, disp
divr rdx, rax, t1
divq rax, rax, t1
};
def macroop IDIV_P
{
rdip t7
ld t1, seg, riprel, disp
divr rdx, rax, t1
divq rax, rax, t1
};
'''
#let {{
# class IDIV(Inst):