From d82d3bbda5b5860c5a69816ebbb8ae217c4bcef4 Mon Sep 17 00:00:00 2001 From: Gabe Black Date: Fri, 12 Oct 2007 20:07:28 -0700 Subject: X86: Implemented LODS. --HG-- extra : convert_revision : 4bd8f15bbc25f5dce16ea0504ad6dd21805fa56a --- .../insts/general_purpose/string/load_string.py | 42 +++++++++++++++------- 1 file changed, 29 insertions(+), 13 deletions(-) (limited to 'src/arch/x86/isa/insts/general_purpose/string/load_string.py') 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" +}; +''' -- cgit v1.2.3