网站开发w亿玛酷1流量订制,网站建设工作,学校网站制作公司,免费网络推广及优化dotnet for mips64 的 ea 版本已经发布https://github.com/gsvm/loongson-dotnet/releases在龙芯上调试CoreCLR由于lldb在龙芯上工作不正常[1]#xff0c;只有gdb可以用来调试CoreCLR。因为需要调试JIT代码#xff0c;所以我们关上gdb分页#xff0c;不处理SIG34信号#x… dotnet for mips64 的 ea 版本已经发布https://github.com/gsvm/loongson-dotnet/releases在龙芯上调试CoreCLR由于lldb在龙芯上工作不正常[1]只有gdb可以用来调试CoreCLR。因为需要调试JIT代码所以我们关上gdb分页不处理SIG34信号$ cat ~/.gdbinit
set pagination off
handle SIG34 nostop noprint调试JIT代码export CORE_LIBRARIES/home/loongson/corefx-3.1-Linux.mips64.Debug
export COMPlus_JitFunctionTrace1
export COMPlus_JitHaltMain
gdb -exr --args ./bin/Product/Linux.mips64.Debug/corerun /home/loongson/Hello.dll | tee gdb.logJitHaltMain可以在Main方法的序言处插入break指令然后我们跳过break指令(gdb) set $pc4
(gdb) x/22i $pc-440xff7c983aac: li zero,0x730xff7c983ab0: nop0xff7c983ab4: 0xf200000xff7c983ab8: sdc1 $f2,-6100(s6)0xff7c983abc: dsra32 zero,zero,0x30xff7c983ac0: 0x7cc11db80xff7c983ac4: dsra32 zero,zero,0x30xff7c983ac8: 0x7cc494580xff7c983acc: dsra32 zero,zero,0x30xff7c983ad0: nop0xff7c983ad4: break0xff7c983ad8: daddiu sp,sp,-320xff7c983adc: sd s8,0(sp)0xff7c983ae0: sd ra,8(sp)0xff7c983ae4: move s8,sp0xff7c983ae8: sd a0,24(s8)0xff7c983aec: lui a0,0xff0xff7c983af0: ori a0,a0,0x7caf0xff7c983af4: dsll a0,a0,0x100xff7c983af8: ori a0,a0,0x7a880xff7c983afc: lw a0,0(a0)0xff7c983b00: sltiu at,a0,1查看一下传参整型寄存器的值(gdb) i r a0
a0: 0xff5800fa28
(gdb) x/g 0xff5800fa28
0xff5800fa28: 0x000000ff7caf7c30然后用si指令级的单步跟踪。还可以使用“硬”watchpoint[2]调试GC相关问题(gdb) watch *0xff68001bf8
Hardware watchpoint 1: *0xff68001bf8
(gdb) c
Continuing....
Thread 1 corerun hit Hardware watchpoint 1: *0xff68001bf8Old value 0
New value 1476465840
JIT_WriteBarrier () at /home/loongson/coreclr/src/vm/mips64/asmhelpers.S:206(gdb) c
Continuing....
Thread 1 corerun hit Hardware watchpoint 1: *0xff68001bf8Old value 1476465840
New value 1476577368
JIT_WriteBarrier () at /home/loongson/coreclr/src/vm/mips64/asmhelpers.S:206如何跟踪是“谁”生成的JIT代码测试用例JIT/Methodical/Invoke/thiscall/dbgthisnull/dbgthisnull.exe[3]加压JIT、GC的时候该测试用例复现段错误export CORE_LIBRARIES/home/loongson/corefx-3.1-Linux.mips64.Debug
export COMPlus_JitFunctionTrace1
export COMPlus_JitStress2
export COMPlus_GCStress1
export COMPlus_HeapVerify1
gdb -exr --args ./bin/Product/Linux.mips64.Debug/corerun ./bin/tests/Linux.mips64.Debug/JIT/Methodical/Invoke/thiscall/_dbgthisnull/_dbgthisnull.exe | tee gdb.log我们发现该测试用例“故意”造空指针访存Program received signal SIGSEGV, Segmentation fault.
0x000000ff7c985948 in ?? ()
(gdb) x/22i $pc-440xff7c98591c: dext a0,a0,0x0,0x80xff7c985920: sltiu at,a0,10xff7c985924: beqz at,0xff7c9859440xff7c985928: nop0xff7c98592c: b 0xff7c98596c0xff7c985930: nop0xff7c985934: nop0xff7c985938: nop0xff7c98593c: nop0xff7c985940: nop0xff7c985944: ld a0,32(s8)0xff7c985948: ldc1 $f0,8(a0)0xff7c98594c: sdc1 $f0,24(s8)0xff7c985950: nop0xff7c985954: b 0xff7c9859a00xff7c985958: nop0xff7c98595c: nop0xff7c985960: nop0xff7c985964: nop0xff7c985968: nop0xff7c98596c: bal 0xff7c9859740xff7c985970: nop
(gdb) i r a0
a0: 0x0那么ldc1 $f0,8(a0)这条指令是由“谁”生成的呢0x000000ff7c985948 in ?? ()
(gdb) x/76i 0x000000ff7c915948-1520xff7c9158b0: daddiu sp,sp,-48 -------- CodeGen::genFnProlog - CodeGen::genAllocLclFrame0xff7c9158b4: sd s8,0(sp) - CodeGen::genPushCalleeSavedRegisters0xff7c9158b8: sd ra,8(sp) - ...0xff7c9158bc: move s8,sp0xff7c9158c0: sd a0,32(s8)0xff7c9158c4: sw a1,40(s8) -------- CodeGen::genFnProlog0xff7c9158c8: lui a0,0xff ----- set_Reg_To_Imm0xff7c9158cc: ori a0,a0,0x7ca80xff7c9158d0: dsll a0,a0,0x100xff7c9158d4: ori a0,a0,0x7b50 ----- set_Reg_To_Imm end0xff7c9158d8: lw a0,0(a0)0xff7c9158dc: sltiu at,a0,1 ---------- CodeGen::genCodeForCompare0xff7c9158e0: beqz at,0xff7c9159000xff7c9158e4: nop0xff7c9158e8: b 0xff7c9159180xff7c9158ec: nop0xff7c9158f0: nop0xff7c9158f4: nop0xff7c9158f8: nop0xff7c9158fc: nop ----------- CodeGen::genCodeForCompare0xff7c915900: lui a0,0xff0xff7c915904: ori a0,a0,0xf6a00xff7c915908: dsll a0,a0,0x100xff7c91590c: ori a0,a0,0x8fa80xff7c915910: jalr a00xff7c915914: move t9,a00xff7c915918: lw a0,40(s8)0xff7c91591c: dext a0,a0,0x0,0x80xff7c915920: sltiu at,a0,1 ---------- CodeGen::genCodeForCompare0xff7c915924: beqz at,0xff7c9159440xff7c915928: nop0xff7c91592c: b 0xff7c91596c0xff7c915930: nop0xff7c915934: nop0xff7c915938: nop0xff7c91593c: nop0xff7c915940: nop ----------- CodeGen::genCodeForCompare0xff7c915944: ld a0,32(s8)0xff7c915948: ldc1 $f0,8(a0)0xff7c91594c: sdc1 $f0,24(s8)0xff7c915950: nop0xff7c915954: b 0xff7c9159a00xff7c915958: nop0xff7c91595c: nop0xff7c915960: nop0xff7c915964: nop0xff7c915968: nop0xff7c91596c: bal 0xff7c9159740xff7c915970: nop0xff7c915974: li at,0x440xff7c915978: daddu a0,at,ra0xff7c91597c: ldc1 $f0,0(a0)0xff7c915980: sdc1 $f0,24(s8)0xff7c915984: nop0xff7c915988: b 0xff7c9159a00xff7c91598c: nop0xff7c915990: nop0xff7c915994: nop0xff7c915998: nop0xff7c91599c: nop0xff7c9159a0: ldc1 $f0,24(s8)0xff7c9159a4: ld ra,8(sp) ---------- CodeGen::genFnEpilog - CodeGen::genPopCalleeSavedRegisters0xff7c9159a8: ld s8,0(sp) - ...0xff7c9159ac: daddiu sp,sp,480xff7c9159b0: jr ra0xff7c9159b4: nop ---------- CodeGen::genFnEpilog...ldc1 $f0,8(a0)是由emitter::emitInsLoadStoreOp和emitter::emitIns_R_R_I生成。你可以“故意”修改src/jit/codegenmips64.cpp[4]的CodeGen::genCodeForIndir添加冗余的nop指令diff --git a/src/jit/codegenmips64.cpp b/src/jit/codegenmips64.cpp
index ef18106..465bc17 100644
--- a/src/jit/codegenmips64.cppb/src/jit/codegenmips64.cpp-8290,6 8290,7 void CodeGen::genCodeForIndir(GenTreeIndir* tree)}getEmitter()-emitInsLoadStoreOp(ins, emitActualTypeSize(type), targetReg, tree);instGen(INS_nop);if (emitBarrier){重新编译就可以看到“故意”生成的冗余nop指令(gdb) x/22i $pc-440xff7c936560: dext a0,a0,0x0,0x80xff7c936564: sltiu at,a0,10xff7c936568: beqz at,0xff7c9365880xff7c93656c: nop0xff7c936570: b 0xff7c9365b40xff7c936574: nop0xff7c936578: nop0xff7c93657c: nop0xff7c936580: nop0xff7c936584: nop0xff7c936588: ld a0,32(s8)0xff7c93658c: ldc1 $f0,8(a0)0xff7c936590: nop0xff7c936594: sdc1 $f0,24(s8)0xff7c936598: nop0xff7c93659c: b 0xff7c9365e80xff7c9365a0: nop0xff7c9365a4: nop0xff7c9365a8: nop0xff7c9365ac: nop0xff7c9365b0: nop0xff7c9365b4: bal 0xff7c9365bc0xff7c9365b8: nop还可以通过grep ldc1 -rn src/jit/来了解访存相关的代码生成。因为ldc1 $f0,8(a0)属于RRI指令形式所以可以在emitter::emitIns_R_R_I“故意”加入断言diff --git a/src/jit/emitmips64.cpp b/src/jit/emitmips64.cpp
index 06b574d..9d19a52 100644
--- a/src/jit/emitmips64.cppb/src/jit/emitmips64.cpp-2513,6 2513,7 void emitter::emitIns_R_R_I(assert((-32768 imm) (imm 32767));assert(isFloatReg(reg1));assert(isGeneralRegisterOrR0(reg2));assert(imm ! 8 reg1 ! REG_F0 reg2 ! REG_A0);break;case INS_c_f_s:gdb bt一下就能知道具体的函数例如emitter::emitInsLoadStoreOp以及行数。1. https://github.com/dotnet/runtime/issues/374052. https://hev.cc/2758.html3. https://github.com/gsvm/coreclr/blob/mips64-port/tests/src/JIT/Methodical/Invoke/thiscall/_dbgthisnull.ilproj4. https://github.com/gsvm/coreclr/blob/mips64-port/src/jit/codegenmips64.cpp相关文章龙芯团队完成CoreCLR MIPS64移植在github开源Asp.Net终于可以在龙芯服务器上运行啦Jexus成功完成对国产系列CPU的适配.NET Core 对龙芯的支持情况和对 .NET Core 开发嵌入式的思考龙芯团队 在移值 MIPS64 下的.NET Core 进度速报
