From 6f3bb03a3fff61de8c8dc53b01d9b48186021d21 Mon Sep 17 00:00:00 2001 From: Gabe Black Date: Sat, 4 Aug 2007 20:15:27 -0700 Subject: [PATCH] X86: Implement the cmpxchg instruction. --HG-- extra : convert_revision : b9e172bcb9551edf65c63f26dfa07d771edf3e1e --- src/arch/x86/isa/decoder/two_byte_opcodes.isa | 4 +-- src/arch/x86/isa/insts/semaphores.py | 27 ++++++++++++++++++- 2 files changed, 28 insertions(+), 3 deletions(-) diff --git a/src/arch/x86/isa/decoder/two_byte_opcodes.isa b/src/arch/x86/isa/decoder/two_byte_opcodes.isa index e8307c6e6..f2d8a972e 100644 --- a/src/arch/x86/isa/decoder/two_byte_opcodes.isa +++ b/src/arch/x86/isa/decoder/two_byte_opcodes.isa @@ -329,8 +329,8 @@ 0x7: Inst::IMUL(Gv,Ev); } 0x16: decode OPCODE_OP_BOTTOM3 { - 0x0: cmpxchg_Eb_Gb(); - 0x1: cmpxchg_Ev_Gv(); + 0x0: Inst::CMPXCHG(Eb,Gb); + 0x1: Inst::CMPXCHG(Ev,Gv); 0x2: lss_Gz_Mp(); 0x3: btr_Ev_Gv(); 0x4: lfs_Gz_Mp(); diff --git a/src/arch/x86/isa/insts/semaphores.py b/src/arch/x86/isa/insts/semaphores.py index 32f28cf82..882213a3f 100644 --- a/src/arch/x86/isa/insts/semaphores.py +++ b/src/arch/x86/isa/insts/semaphores.py @@ -53,7 +53,32 @@ # # Authors: Gabe Black -microcode = "" +microcode = ''' +def macroop CMPXCHG_R_R { + sub t0, rax, reg, flags=(OF, SF, ZF, AF, PF, CF) + mov reg, reg, regm, flags=(CZF,) + mov rax, rax, reg, flags=(nCZF,) +}; + +def macroop CMPXCHG_M_R { + ld t1, seg, sib, disp + sub t0, rax, t1, flags=(OF, SF, ZF, AF, PF, CF) + + mov t1, t1, reg, flags=(CZF,) + st t1, seg, sib, disp + mov rax, rax, t1, flags=(nCZF,) +}; + +def macroop CMPXCHG_P_R { + rdip t7 + ld t1, seg, riprel, disp + sub t0, rax, t1, flags=(OF, SF, ZF, AF, PF, CF) + + mov t1, t1, reg, flags=(CZF,) + st t1, seg, riprel, disp + mov rax, rax, t1, flags=(nCZF,) +}; +''' #let {{ # class CMPXCHG(Inst): # "GenFault ${new UnimpInstFault}" -- 2.30.2