From: Ali Saidi Date: Thu, 25 Jan 2007 18:43:46 +0000 (-0500) Subject: fix smul and sdiv to sign extend, and handle overflow/underflow corretly X-Git-Tag: m5_2.0_beta3~224^2~4 X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=8561c8366c7c9afd7e6b52b6e2385b3c1dde95a9;p=gem5.git fix smul and sdiv to sign extend, and handle overflow/underflow corretly Only allow writing/reading of 32 bits of Y Only allow writing/reading 32 bits of pc when pstate.am Put any loaded data on the first half of a micro-op in uReg0 so it can't overwrite the register we are using for address calculation only erase a entry from the lookup table if it's valid Put in a temporary check to make sure that lookup table and tlb array stay in sync if we are interrupted in the middle of a mico-op, reset the micropc/nexpc so we start on the first part of it when we come back src/arch/sparc/isa/decoder.isa: fix smul and sdiv to sign extend, and handle overflow/underflow corretly Only allow writing/reading of 32 bits of Y Only allow writing/reading 32 bits of pc when pstate.am Put any loaded data on the first half of a micro-op in uReg0 so it can't overwrite the register we are using for address calculation src/arch/sparc/isa/formats/mem/blockmem.isa: Put any loaded data on the first half of a micro-op in uReg0 so it can't overwrite the register we are using for address calculation src/arch/sparc/isa/includes.isa: Use limits for 32bit underflow/overflow detection src/arch/sparc/tlb.cc: only erase a entry from the lookup table if it's valid Put in a temporary check to make sure that lookup table and tlb array stay in sync src/arch/sparc/tlb_map.hh: add a print function to dump the tlb lookup table src/cpu/simple/base.cc: if we are interrupted in the middle of a mico-op, reset the micropc/nexpc so we start on the first part of it when we come back --HG-- extra : convert_revision : 50a23837fd888393a5c2aa35cbd1abeebb7f55d4 --- diff --git a/src/arch/sparc/isa/decoder.isa b/src/arch/sparc/isa/decoder.isa index 548953982..425ebc9d0 100644 --- a/src/arch/sparc/isa/decoder.isa +++ b/src/arch/sparc/isa/decoder.isa @@ -186,7 +186,7 @@ decode OP default Unknown::unknown() Y = Rd<63:32>; }}); 0x0B: smul({{ - Rd.sdw = Rs1.sdw<31:0> * Rs2_or_imm13<31:0>; + Rd.sdw = sext<32>(Rs1.sdw) * sext<32>(Rs2_or_imm13); Y = Rd.sdw<63:32>; }}); 0x0C: subc({{Rd.sdw = Rs1.sdw + (~Rs2_or_imm13) + 1 - Ccr<0:0>}}); @@ -209,10 +209,10 @@ decode OP default Unknown::unknown() else { Rd.udw = ((int64_t)((Y << 32) | Rs1.sdw<31:0>)) / Rs2_or_imm13.sdw; - if(Rd.udw<63:31> != 0) + if((int64_t)Rd.udw >= std::numeric_limits::max()) Rd.udw = 0x7FFFFFFF; - else if(Rd.udw<63:> && Rd.udw<62:31> != 0xFFFFFFFF) - Rd.udw = 0xFFFFFFFF80000000ULL; + else if((int64_t)Rd.udw <= std::numeric_limits::min()) + Rd.udw = ULL(0xFFFFFFFF80000000); } }}); } @@ -257,7 +257,7 @@ decode OP default Unknown::unknown() {{0}},{{0}},{{0}},{{0}}); 0x1B: smulcc({{ int64_t resTemp; - Rd = resTemp = Rs1.sdw<31:0> * Rs2_or_imm13.sdw<31:0>; + Rd = resTemp = sext<32>(Rs1.sdw) * sext<32>(Rs2_or_imm13); Y = resTemp<63:32>;}}, {{0}},{{0}},{{0}},{{0}}); 0x1C: subccc({{ @@ -296,10 +296,10 @@ decode OP default Unknown::unknown() else { Rd = (int64_t)((Y << 32) | Rs1.sdw<31:0>) / val2; - overflow = (Rd<63:31> != 0); - underflow = (Rd<63:> && Rd<62:31> != 0xFFFFFFFF); + overflow = ((int64_t)Rd >= std::numeric_limits::max()); + underflow = ((int64_t)Rd <= std::numeric_limits::min()); if(overflow) Rd = 0x7FFFFFFF; - else if(underflow) Rd = 0xFFFFFFFF80000000ULL; + else if(underflow) Rd = ULL(0xFFFFFFFF80000000); } }}, {{0}}, {{overflow || underflow}}, @@ -376,7 +376,7 @@ decode OP default Unknown::unknown() 0x1: srax({{Rd = Rs1.sdw >> (I ? SHCNT64 : Rs2<5:0>);}}); } 0x28: decode RS1 { - 0x00: NoPriv::rdy({{Rd = Y;}}); + 0x00: NoPriv::rdy({{Rd = Y<31:0>;}}); //1 should cause an illegal instruction exception 0x02: NoPriv::rdccr({{Rd = Ccr;}}); 0x03: NoPriv::rdasi({{Rd = Asi;}}); @@ -526,7 +526,7 @@ decode OP default Unknown::unknown() 0x7: movrge({{Rd = (Rs1.sdw >= 0) ? Rs2_or_imm10 : Rd;}}); } 0x30: decode RD { - 0x00: NoPriv::wry({{Y = Rs1 ^ Rs2_or_imm13;}}); + 0x00: NoPriv::wry({{Y = (Rs1 ^ Rs2_or_imm13)<31:0>;}}); //0x01 should cause an illegal instruction exception 0x02: NoPriv::wrccr({{Ccr = Rs1 ^ Rs2_or_imm13;}}); 0x03: NoPriv::wrasi({{Asi = Rs1 ^ Rs2_or_imm13;}}); @@ -882,7 +882,7 @@ decode OP default Unknown::unknown() else { if (Pstate<3:>) - (Rd = xc->readPC())<31:0>; + Rd = (xc->readPC())<31:0>; else Rd = xc->readPC(); NNPC = target; @@ -1058,13 +1058,14 @@ decode OP default Unknown::unknown() 0x0B: ldx({{Rd = (int64_t)Mem.sdw;}}); } 0x0D: LoadStore::ldstub( - {{Rd = Mem.ub;}}, - {{Mem.ub = 0xFF;}}); + {{uReg0 = Mem.ub;}}, + {{Rd.ub = uReg0; + Mem.ub = 0xFF;}}); 0x0E: Store::stx({{Mem.udw = Rd}}); 0x0F: LoadStore::swap( - {{uReg0 = Rd.uw; - Rd.uw = Mem.uw;}}, - {{Mem.uw = uReg0;}}); + {{ uReg0 = Mem.uw}}, + {{ Mem.uw = Rd.uw; + Rd.uw = uReg0;}}); format LoadAlt { 0x10: lduwa({{Rd = Mem.uw;}}, {{EXT_ASI}}); 0x11: lduba({{Rd = Mem.ub;}}, {{EXT_ASI}}); @@ -1072,34 +1073,34 @@ decode OP default Unknown::unknown() 0x13: decode EXT_ASI { //ASI_LDTD_AIUP 0x22: TwinLoad::ldtx_aiup( - {{RdTwin.udw = Mem.udw}}, {{EXT_ASI}}); + {{RdTwin.udw = Mem.udw;}}, {{EXT_ASI}}); //ASI_LDTD_AIUS 0x23: TwinLoad::ldtx_aius( - {{RdTwin.udw = Mem.udw}}, {{EXT_ASI}}); + {{RdTwin.udw = Mem.udw;}}, {{EXT_ASI}}); //ASI_QUAD_LDD 0x24: TwinLoad::ldtx_quad_ldd( - {{RdTwin.udw = Mem.udw}}, {{EXT_ASI}}); + {{RdTwin.udw = Mem.udw;}}, {{EXT_ASI}}); //ASI_LDTX_REAL 0x26: TwinLoad::ldtx_real( - {{RdTwin.udw = Mem.udw}}, {{EXT_ASI}}); + {{RdTwin.udw = Mem.udw;}}, {{EXT_ASI}}); //ASI_LDTX_N 0x27: TwinLoad::ldtx_n( - {{RdTwin.udw = Mem.udw}}, {{EXT_ASI}}); + {{RdTwin.udw = Mem.udw;}}, {{EXT_ASI}}); //ASI_LDTX_L 0x2C: TwinLoad::ldtx_l( - {{RdTwin.udw = Mem.udw}}, {{EXT_ASI}}); + {{RdTwin.udw = Mem.udw;}}, {{EXT_ASI}}); //ASI_LDTX_REAL_L 0x2E: TwinLoad::ldtx_real_l( - {{RdTwin.udw = Mem.udw}}, {{EXT_ASI}}); + {{RdTwin.udw = Mem.udw;}}, {{EXT_ASI}}); //ASI_LDTX_N_L 0x2F: TwinLoad::ldtx_n_l( - {{RdTwin.udw = Mem.udw}}, {{EXT_ASI}}); + {{RdTwin.udw = Mem.udw;}}, {{EXT_ASI}}); //ASI_LDTX_P 0xE2: TwinLoad::ldtx_p( - {{RdTwin.udw = Mem.udw}}, {{EXT_ASI}}); + {{RdTwin.udw = Mem.udw;}}, {{EXT_ASI}}); //ASI_LDTX_S 0xE3: TwinLoad::ldtx_s( - {{RdTwin.udw = Mem.udw}}, {{EXT_ASI}}); + {{RdTwin.udw = Mem.udw;}}, {{EXT_ASI}}); default: ldtwa({{ uint64_t val = Mem.udw; RdLow = val<31:0>; @@ -1120,13 +1121,14 @@ decode OP default Unknown::unknown() 0x1B: ldxa({{Rd = (int64_t)Mem.sdw;}}, {{EXT_ASI}}); } 0x1D: LoadStoreAlt::ldstuba( - {{Rd = Mem.ub;}}, - {{Mem.ub = 0xFF}}, {{EXT_ASI}}); + {{uReg0 = Mem.ub;}}, + {{Rd.ub = uReg0; + Mem.ub = 0xFF;}}, {{EXT_ASI}}); 0x1E: StoreAlt::stxa({{Mem.udw = Rd}}, {{EXT_ASI}}); 0x1F: LoadStoreAlt::swapa( - {{uReg0 = Rd.uw; - Rd.uw = Mem.uw;}}, - {{Mem.uw = uReg0;}}, {{EXT_ASI}}); + {{ uReg0 = Mem.uw}}, + {{ Mem.uw = Rd.uw; + Rd.uw = uReg0;}}, {{EXT_ASI}}); format Trap { 0x20: Load::ldf({{Frd.uw = Mem.uw;}}); 0x21: decode X { diff --git a/src/arch/sparc/isa/formats/mem/blockmem.isa b/src/arch/sparc/isa/formats/mem/blockmem.isa index 32421a75f..c36fede2e 100644 --- a/src/arch/sparc/isa/formats/mem/blockmem.isa +++ b/src/arch/sparc/isa/formats/mem/blockmem.isa @@ -476,7 +476,6 @@ let {{ faultCode = '' return (header_output, decoder_output, exec_output, decode_block) - def doTwinLoadFormat(code, faultCode, name, Name, asi, opt_flags): addrCalcReg = 'EA = Rs1 + Rs2 + offset;' addrCalcImm = 'EA = Rs1 + imm + offset;' @@ -492,10 +491,11 @@ let {{ pcedCode = '' if (microPc == 1): flag_code = "flags[IsLastMicroOp] = true;" - pcedCode = matcher.sub("RdHigh", code) + pcedCode = "RdLow = uReg0;\n" + pcedCode += matcher.sub("RdHigh", code) else: flag_code = "flags[IsDelayedCommit] = true; flags[IsFirstMicroOp] = true;" - pcedCode = matcher.sub("RdLow", code) + pcedCode = matcher.sub("uReg0", code) iop = InstObjParams(name, Name, 'TwinMem', pcedCode, opt_flags, {"ea_code": addrCalcReg, "fault_check": faultCode, "micro_pc": microPc, diff --git a/src/arch/sparc/isa/includes.isa b/src/arch/sparc/isa/includes.isa index 624afb693..0c112d481 100644 --- a/src/arch/sparc/isa/includes.isa +++ b/src/arch/sparc/isa/includes.isa @@ -1,4 +1,4 @@ -// Copyright (c) 2006 The Regents of The University of Michigan +// Copyright (c) 2006-2007 The Regents of The University of Michigan // All rights reserved. // // Redistribution and use in source and binary forms, with or without @@ -63,6 +63,7 @@ output exec {{ #if defined(linux) #include #endif +#include #include "arch/sparc/asi.hh" #include "cpu/base.hh" diff --git a/src/arch/sparc/tlb.cc b/src/arch/sparc/tlb.cc index 0e59f3e15..bf57c894f 100644 --- a/src/arch/sparc/tlb.cc +++ b/src/arch/sparc/tlb.cc @@ -170,8 +170,8 @@ insertAllLocked: freeList.remove(new_entry); if (new_entry->valid && new_entry->used) usedEntries--; - - lookupTable.erase(new_entry->range); + if (new_entry->valid) + lookupTable.erase(new_entry->range); DPRINTF(TLB, "Using entry: %#X\n", new_entry); @@ -582,6 +582,9 @@ DTB::translate(RequestPtr &req, ThreadContext *tc, bool write) DPRINTF(TLB, "TLB: DTB Request to translate va=%#x size=%d asi=%#x\n", vaddr, size, asi); + if (lookupTable.size() != 64 - freeList.size()) + panic("Lookup table size: %d tlb size: %d\n", lookupTable.size(), + freeList.size()); if (asi == ASI_IMPLICIT) implicit = true; diff --git a/src/arch/sparc/tlb_map.hh b/src/arch/sparc/tlb_map.hh index 688daf5b9..8285db939 100644 --- a/src/arch/sparc/tlb_map.hh +++ b/src/arch/sparc/tlb_map.hh @@ -135,6 +135,19 @@ class TlbMap { return tree.empty(); } + + void print() + { + iterator i; + i = tree.begin(); + while (i != tree.end()) { + std::cout << std::hex << i->first.va << " " << i->first.size << " " << + i->first.contextId << " " << i->first.partitionId << " " << + i->first.real << " " << i->second << std::endl; + i++; + } + } + }; }; diff --git a/src/cpu/simple/base.cc b/src/cpu/simple/base.cc index ddccc5a9b..14fefe103 100644 --- a/src/cpu/simple/base.cc +++ b/src/cpu/simple/base.cc @@ -439,6 +439,8 @@ BaseSimpleCPU::advancePC(Fault fault) if (fault != NoFault) { curMacroStaticInst = StaticInst::nullStaticInstPtr; fault->invoke(tc); + thread->setMicroPC(0); + thread->setNextMicroPC(1); } else { //If we're at the last micro op for this instruction if (curStaticInst->isLastMicroOp()) {