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runtime: implement exception handling on windows/amd64
Fixes #2194. R=rsc, alex.brainman, vcc.163, jp CC=golang-dev https://golang.org/cl/4977044
This commit is contained in:
Hector Chu
Alex Brainman
parent
2b6d3b498c
commit
9b011500c0
@ -525,6 +525,48 @@ addpersrc(void)
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dd[IMAGE_DIRECTORY_ENTRY_RESOURCE].Size = h->VirtualSize;
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}
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static void
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addexcept(IMAGE_SECTION_HEADER *text)
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{
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IMAGE_SECTION_HEADER *pdata, *xdata;
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vlong startoff;
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uvlong n;
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Sym *sym;
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if(thechar != '6')
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return;
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// write unwind info
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sym = lookup("runtime.sigtramp", 0);
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startoff = cpos();
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lputl(9); // version=1, flags=UNW_FLAG_EHANDLER, rest 0
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lputl(sym->value - PEBASE);
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lputl(0);
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n = cpos() - startoff;
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xdata = addpesection(".xdata", n, n);
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xdata->Characteristics = IMAGE_SCN_MEM_READ|
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IMAGE_SCN_CNT_INITIALIZED_DATA;
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chksectoff(xdata, startoff);
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strnput("", xdata->SizeOfRawData - n);
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// write a function table entry for the whole text segment
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startoff = cpos();
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lputl(text->VirtualAddress);
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lputl(text->VirtualAddress + text->VirtualSize);
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lputl(xdata->VirtualAddress);
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n = cpos() - startoff;
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pdata = addpesection(".pdata", n, n);
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pdata->Characteristics = IMAGE_SCN_MEM_READ|
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IMAGE_SCN_CNT_INITIALIZED_DATA;
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chksectoff(pdata, startoff);
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strnput("", pdata->SizeOfRawData - n);
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dd[IMAGE_DIRECTORY_ENTRY_EXCEPTION].VirtualAddress = pdata->VirtualAddress;
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dd[IMAGE_DIRECTORY_ENTRY_EXCEPTION].Size = pdata->VirtualSize;
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}
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void
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asmbpe(void)
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{
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@ -562,7 +604,8 @@ asmbpe(void)
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addexports();
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addsymtable();
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addpersrc();
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addexcept(t);
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fh.NumberOfSections = nsect;
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fh.TimeDateStamp = time(0);
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fh.Characteristics = IMAGE_FILE_RELOCS_STRIPPED|
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@ -599,8 +642,16 @@ asmbpe(void)
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set(Subsystem, IMAGE_SUBSYSTEM_WINDOWS_GUI);
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else
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set(Subsystem, IMAGE_SUBSYSTEM_WINDOWS_CUI);
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set(SizeOfStackReserve, 0x0040000);
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set(SizeOfStackCommit, 0x00001000);
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// Disable stack growth as we don't want Windows to
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// fiddle with the thread stack limits, which we set
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// ourselves to circumvent the stack checks in the
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// Windows exception dispatcher.
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// Commit size must be strictly less than reserve
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// size otherwise reserve will be rounded up to a
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// larger size, as verified with VMMap.
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set(SizeOfStackReserve, 0x00010000);
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set(SizeOfStackCommit, 0x0000ffff);
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set(SizeOfHeapReserve, 0x00100000);
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set(SizeOfHeapCommit, 0x00001000);
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set(NumberOfRvaAndSizes, 16);
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@ -1,4 +1,4 @@
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// g:\opensource\go\bin\godefs.exe -f -m64 defs.c
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// c:\go\bin\godefs.exe -f -m64 defs.c
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// MACHINE GENERATED - DO NOT EDIT.
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@ -37,4 +37,60 @@ struct ExceptionRecord {
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byte pad_godefs_0[4];
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uint64 ExceptionInformation[15];
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};
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typedef struct M128a M128a;
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struct M128a {
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uint64 Low;
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int64 High;
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};
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typedef struct Context Context;
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struct Context {
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uint64 P1Home;
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uint64 P2Home;
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uint64 P3Home;
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uint64 P4Home;
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uint64 P5Home;
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uint64 P6Home;
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uint32 ContextFlags;
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uint32 MxCsr;
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uint16 SegCs;
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uint16 SegDs;
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uint16 SegEs;
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uint16 SegFs;
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uint16 SegGs;
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uint16 SegSs;
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uint32 EFlags;
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uint64 Dr0;
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uint64 Dr1;
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uint64 Dr2;
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uint64 Dr3;
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uint64 Dr6;
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uint64 Dr7;
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uint64 Rax;
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uint64 Rcx;
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uint64 Rdx;
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uint64 Rbx;
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uint64 Rsp;
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uint64 Rbp;
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uint64 Rsi;
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uint64 Rdi;
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uint64 R8;
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uint64 R9;
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uint64 R10;
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uint64 R11;
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uint64 R12;
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uint64 R13;
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uint64 R14;
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uint64 R15;
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uint64 Rip;
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byte Pad_godefs_0[512];
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M128a VectorRegister[26];
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uint64 VectorControl;
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uint64 DebugControl;
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uint64 LastBranchToRip;
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uint64 LastBranchFromRip;
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uint64 LastExceptionToRip;
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uint64 LastExceptionFromRip;
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};
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#pragma pack off
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@ -6,10 +6,97 @@
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#include "defs.h"
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#include "os.h"
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extern void *runtime·sigtramp;
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void
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runtime·initsig(int32 queue)
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runtime·dumpregs(Context *r)
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{
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runtime·printf("rax %X\n", r->Rax);
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runtime·printf("rbx %X\n", r->Rbx);
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runtime·printf("rcx %X\n", r->Rcx);
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runtime·printf("rdx %X\n", r->Rdx);
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runtime·printf("rdi %X\n", r->Rdi);
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runtime·printf("rsi %X\n", r->Rsi);
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runtime·printf("rbp %X\n", r->Rbp);
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runtime·printf("rsp %X\n", r->Rsp);
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runtime·printf("r8 %X\n", r->R8 );
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runtime·printf("r9 %X\n", r->R9 );
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runtime·printf("r10 %X\n", r->R10);
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runtime·printf("r11 %X\n", r->R11);
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runtime·printf("r12 %X\n", r->R12);
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runtime·printf("r13 %X\n", r->R13);
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runtime·printf("r14 %X\n", r->R14);
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runtime·printf("r15 %X\n", r->R15);
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runtime·printf("rip %X\n", r->Rip);
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runtime·printf("rflags %X\n", r->EFlags);
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runtime·printf("cs %X\n", (uint64)r->SegCs);
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runtime·printf("fs %X\n", (uint64)r->SegFs);
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runtime·printf("gs %X\n", (uint64)r->SegGs);
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}
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void
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runtime·initsig(int32)
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{
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runtime·siginit();
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// following line keeps sigtramp alive at link stage
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// if there's a better way please write it here
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void *p = runtime·sigtramp;
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USED(p);
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}
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uint32
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runtime·sighandler(ExceptionRecord *info, Context *r, G *gp)
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{
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uintptr *sp;
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switch(info->ExceptionCode) {
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case EXCEPTION_BREAKPOINT:
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return 1;
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}
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if(gp != nil && runtime·issigpanic(info->ExceptionCode)) {
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// Make it look like a call to the signal func.
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// Have to pass arguments out of band since
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// augmenting the stack frame would break
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// the unwinding code.
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gp->sig = info->ExceptionCode;
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gp->sigcode0 = info->ExceptionInformation[0];
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gp->sigcode1 = info->ExceptionInformation[1];
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gp->sigpc = r->Rip;
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// Only push runtime·sigpanic if r->rip != 0.
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// If r->rip == 0, probably panicked because of a
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// call to a nil func. Not pushing that onto sp will
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// make the trace look like a call to runtime·sigpanic instead.
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// (Otherwise the trace will end at runtime·sigpanic and we
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// won't get to see who faulted.)
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if(r->Rip != 0) {
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sp = (uintptr*)r->Rsp;
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*--sp = r->Rip;
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r->Rsp = (uintptr)sp;
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}
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r->Rip = (uintptr)runtime·sigpanic;
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return 0;
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}
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if(runtime·panicking) // traceback already printed
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runtime·exit(2);
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runtime·panicking = 1;
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runtime·printf("Exception %x %p %p\n", info->ExceptionCode,
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info->ExceptionInformation[0], info->ExceptionInformation[1]);
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runtime·printf("PC=%X\n", r->Rip);
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runtime·printf("\n");
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if(runtime·gotraceback()){
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runtime·traceback((void*)r->Rip, (void*)r->Rsp, 0, gp);
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runtime·tracebackothers(gp);
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runtime·dumpregs(r);
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}
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runtime·exit(2);
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return 0;
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}
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void
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@ -70,6 +70,36 @@ TEXT runtime·setlasterror(SB),7,$0
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MOVL AX, 0x68(CX)
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RET
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TEXT runtime·sigtramp(SB),7,$56
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// CX: exception record
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// R8: context
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// unwinding?
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TESTL $6, 4(CX) // exception flags
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MOVL $1, AX
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JNZ sigdone
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// copy arguments for call to sighandler
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MOVQ CX, 0(SP)
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MOVQ R8, 8(SP)
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get_tls(CX)
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MOVQ g(CX), CX
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MOVQ CX, 16(SP)
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MOVQ BX, 24(SP)
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MOVQ BP, 32(SP)
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MOVQ SI, 40(SP)
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MOVQ DI, 48(SP)
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CALL runtime·sighandler(SB)
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MOVQ 24(SP), BX
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MOVQ 32(SP), BP
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MOVQ 40(SP), SI
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MOVQ 48(SP), DI
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sigdone:
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RET
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// Windows runs the ctrl handler in a new thread.
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TEXT runtime·ctrlhandler(SB),7,$0
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PUSHQ BP
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@ -182,6 +212,13 @@ TEXT runtime·callbackasm(SB),7,$0
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POPQ -8(CX)(DX*1) // restore bytes just after the args
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RET
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TEXT runtime·setstacklimits(SB),7,$0
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MOVQ 0x30(GS), CX
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MOVQ $0, 0x10(CX)
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MOVQ $0xffffffffffff, AX
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MOVQ AX, 0x08(CX)
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RET
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// uint32 tstart_stdcall(M *newm);
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TEXT runtime·tstart_stdcall(SB),7,$0
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// CX contains first arg newm
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@ -202,6 +239,7 @@ TEXT runtime·tstart_stdcall(SB),7,$0
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// Someday the convention will be D is always cleared.
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CLD
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CALL runtime·setstacklimits(SB)
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CALL runtime·stackcheck(SB) // clobbers AX,CX
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CALL runtime·mstart(SB)
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@ -215,5 +253,6 @@ TEXT runtime·notok(SB),7,$0
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// set tls base to DI
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TEXT runtime·settls(SB),7,$0
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CALL runtime·setstacklimits(SB)
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MOVQ DI, 0x58(GS)
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RET
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@ -33,5 +33,10 @@ enum {
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};
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typedef EXCEPTION_RECORD $ExceptionRecord;
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#ifdef _X86_
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typedef FLOATING_SAVE_AREA $FloatingSaveArea;
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#endif
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#ifdef _AMD64_
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typedef M128A $M128a;
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#endif
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typedef CONTEXT $Context;
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