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Diffstat (limited to 'src/pkg/runtime/traceback_x86.c')
-rw-r--r--src/pkg/runtime/traceback_x86.c430
1 files changed, 0 insertions, 430 deletions
diff --git a/src/pkg/runtime/traceback_x86.c b/src/pkg/runtime/traceback_x86.c
deleted file mode 100644
index 7359cfcc9..000000000
--- a/src/pkg/runtime/traceback_x86.c
+++ /dev/null
@@ -1,430 +0,0 @@
-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build amd64 amd64p32 386
-
-#include "runtime.h"
-#include "arch_GOARCH.h"
-#include "malloc.h"
-#include "funcdata.h"
-#ifdef GOOS_windows
-#include "defs_GOOS_GOARCH.h"
-#endif
-
-void runtime·sigpanic(void);
-void runtime·newproc(void);
-void runtime·deferproc(void);
-
-#ifdef GOOS_windows
-void runtime·sigtramp(void);
-#endif
-
-// This code is also used for the 386 tracebacks.
-// Use uintptr for an appropriate word-sized integer.
-
-// Generic traceback. Handles runtime stack prints (pcbuf == nil),
-// the runtime.Callers function (pcbuf != nil), as well as the garbage
-// collector (callback != nil). A little clunky to merge these, but avoids
-// duplicating the code and all its subtlety.
-int32
-runtime·gentraceback(uintptr pc0, uintptr sp0, uintptr lr0, G *gp, int32 skip, uintptr *pcbuf, int32 max, bool (*callback)(Stkframe*, void*), void *v, bool printall)
-{
- int32 i, n, nprint, line, gotraceback;
- uintptr tracepc, sparg;
- bool waspanic, wasnewproc, printing;
- Func *f, *flr;
- Stkframe frame;
- Stktop *stk;
- String file;
- Panic *panic;
- Defer *defer;
-
- USED(lr0);
-
- gotraceback = runtime·gotraceback(nil);
-
- if(pc0 == ~(uintptr)0 && sp0 == ~(uintptr)0) { // Signal to fetch saved values from gp.
- if(gp->syscallstack != (uintptr)nil) {
- pc0 = gp->syscallpc;
- sp0 = gp->syscallsp;
- } else {
- pc0 = gp->sched.pc;
- sp0 = gp->sched.sp;
- }
- }
-
- nprint = 0;
- runtime·memclr((byte*)&frame, sizeof frame);
- frame.pc = pc0;
- frame.sp = sp0;
- waspanic = false;
- wasnewproc = false;
- printing = pcbuf==nil && callback==nil;
- panic = gp->panic;
- defer = gp->defer;
-
- while(defer != nil && defer->argp == NoArgs)
- defer = defer->link;
- while(panic != nil && panic->defer == nil)
- panic = panic->link;
-
- // If the PC is zero, it's likely a nil function call.
- // Start in the caller's frame.
- if(frame.pc == 0) {
- frame.pc = *(uintptr*)frame.sp;
- frame.sp += sizeof(uintreg);
- }
-
- f = runtime·findfunc(frame.pc);
- if(f == nil) {
- if(callback != nil) {
- runtime·printf("runtime: unknown pc %p\n", frame.pc);
- runtime·throw("unknown pc");
- }
- return 0;
- }
- frame.fn = f;
-
- n = 0;
- stk = (Stktop*)gp->stackbase;
- while(n < max) {
- // Typically:
- // pc is the PC of the running function.
- // sp is the stack pointer at that program counter.
- // fp is the frame pointer (caller's stack pointer) at that program counter, or nil if unknown.
- // stk is the stack containing sp.
- // The caller's program counter is lr, unless lr is zero, in which case it is *(uintptr*)sp.
-
- if(frame.pc == (uintptr)runtime·lessstack) {
- // Hit top of stack segment. Unwind to next segment.
- frame.pc = stk->gobuf.pc;
- frame.sp = stk->gobuf.sp;
- frame.lr = 0;
- frame.fp = 0;
- frame.fn = nil;
- if(printing && runtime·showframe(nil, gp))
- runtime·printf("----- stack segment boundary -----\n");
- stk = (Stktop*)stk->stackbase;
-
- f = runtime·findfunc(frame.pc);
- if(f == nil) {
- runtime·printf("runtime: unknown pc %p after stack split\n", frame.pc);
- if(callback != nil)
- runtime·throw("unknown pc");
- }
- frame.fn = f;
- continue;
- }
-
- f = frame.fn;
-
-#ifdef GOOS_windows
- // Windows exception handlers run on the actual g stack (there is room
- // dedicated to this below the usual "bottom of stack"), not on a separate
- // stack. As a result, we have to be able to unwind past the exception
- // handler when called to unwind during stack growth inside the handler.
- // Recognize the frame at the call to sighandler in sigtramp and unwind
- // using the context argument passed to the call. This is awful.
- if(f != nil && f->entry == (uintptr)runtime·sigtramp && frame.pc > f->entry) {
- Context *r;
-
- // Invoke callback so that stack copier sees an uncopyable frame.
- if(callback != nil) {
- frame.continpc = frame.pc;
- frame.argp = nil;
- frame.arglen = 0;
- if(!callback(&frame, v))
- return n;
- }
- r = (Context*)((uintptr*)frame.sp)[1];
-#ifdef GOARCH_amd64
- frame.pc = r->Rip;
- frame.sp = r->Rsp;
-#else
- frame.pc = r->Eip;
- frame.sp = r->Esp;
-#endif
- frame.lr = 0;
- frame.fp = 0;
- frame.fn = nil;
- if(printing && runtime·showframe(nil, gp))
- runtime·printf("----- exception handler -----\n");
- f = runtime·findfunc(frame.pc);
- if(f == nil) {
- runtime·printf("runtime: unknown pc %p after exception handler\n", frame.pc);
- if(callback != nil)
- runtime·throw("unknown pc");
- }
- frame.fn = f;
- continue;
- }
-#endif
-
- // Found an actual function.
- // Derive frame pointer and link register.
- if(frame.fp == 0) {
- frame.fp = frame.sp + runtime·funcspdelta(f, frame.pc);
- frame.fp += sizeof(uintreg); // caller PC
- }
- if(runtime·topofstack(f)) {
- frame.lr = 0;
- flr = nil;
- } else {
- if(frame.lr == 0)
- frame.lr = ((uintreg*)frame.fp)[-1];
- flr = runtime·findfunc(frame.lr);
- if(flr == nil) {
- runtime·printf("runtime: unexpected return pc for %s called from %p\n", runtime·funcname(f), frame.lr);
- if(callback != nil)
- runtime·throw("unknown caller pc");
- }
- }
-
- frame.varp = (byte*)frame.fp - sizeof(uintreg);
-
- // Derive size of arguments.
- // Most functions have a fixed-size argument block,
- // so we can use metadata about the function f.
- // Not all, though: there are some variadic functions
- // in package runtime and reflect, and for those we use call-specific
- // metadata recorded by f's caller.
- if(callback != nil || printing) {
- frame.argp = (byte*)frame.fp;
- if(f->args != ArgsSizeUnknown)
- frame.arglen = f->args;
- else if(flr == nil)
- frame.arglen = 0;
- else if(frame.lr == (uintptr)runtime·lessstack)
- frame.arglen = stk->argsize;
- else if((i = runtime·funcarglen(flr, frame.lr)) >= 0)
- frame.arglen = i;
- else {
- runtime·printf("runtime: unknown argument frame size for %s called from %p [%s]\n",
- runtime·funcname(f), frame.lr, flr ? runtime·funcname(flr) : "?");
- if(callback != nil)
- runtime·throw("invalid stack");
- frame.arglen = 0;
- }
- }
-
- // Determine function SP where deferproc would find its arguments.
- // On x86 that's just the standard bottom-of-stack, so SP exactly.
- // If the previous frame was a direct call to newproc/deferproc, however,
- // the SP is two words lower than normal.
- sparg = frame.sp;
- if(wasnewproc)
- sparg += 2*sizeof(uintptr);
-
- // Determine frame's 'continuation PC', where it can continue.
- // Normally this is the return address on the stack, but if sigpanic
- // is immediately below this function on the stack, then the frame
- // stopped executing due to a trap, and frame.pc is probably not
- // a safe point for looking up liveness information. In this panicking case,
- // the function either doesn't return at all (if it has no defers or if the
- // defers do not recover) or it returns from one of the calls to
- // deferproc a second time (if the corresponding deferred func recovers).
- // It suffices to assume that the most recent deferproc is the one that
- // returns; everything live at earlier deferprocs is still live at that one.
- frame.continpc = frame.pc;
- if(waspanic) {
- if(panic != nil && panic->defer->argp == (byte*)sparg)
- frame.continpc = (uintptr)panic->defer->pc;
- else if(defer != nil && defer->argp == (byte*)sparg)
- frame.continpc = (uintptr)defer->pc;
- else
- frame.continpc = 0;
- }
-
- // Unwind our local panic & defer stacks past this frame.
- while(panic != nil && (panic->defer == nil || panic->defer->argp == (byte*)sparg || panic->defer->argp == NoArgs))
- panic = panic->link;
- while(defer != nil && (defer->argp == (byte*)sparg || defer->argp == NoArgs))
- defer = defer->link;
-
- if(skip > 0) {
- skip--;
- goto skipped;
- }
-
- if(pcbuf != nil)
- pcbuf[n] = frame.pc;
- if(callback != nil) {
- if(!callback(&frame, v))
- return n;
- }
- if(printing) {
- if(printall || runtime·showframe(f, gp)) {
- // Print during crash.
- // main(0x1, 0x2, 0x3)
- // /home/rsc/go/src/runtime/x.go:23 +0xf
- //
- tracepc = frame.pc; // back up to CALL instruction for funcline.
- if(n > 0 && frame.pc > f->entry && !waspanic)
- tracepc--;
- runtime·printf("%s(", runtime·funcname(f));
- for(i = 0; i < frame.arglen/sizeof(uintptr); i++) {
- if(i >= 10) {
- runtime·prints(", ...");
- break;
- }
- if(i != 0)
- runtime·prints(", ");
- runtime·printhex(((uintptr*)frame.argp)[i]);
- }
- runtime·prints(")\n");
- line = runtime·funcline(f, tracepc, &file);
- runtime·printf("\t%S:%d", file, line);
- if(frame.pc > f->entry)
- runtime·printf(" +%p", (uintptr)(frame.pc - f->entry));
- if(m->throwing > 0 && gp == m->curg || gotraceback >= 2)
- runtime·printf(" fp=%p sp=%p", frame.fp, frame.sp);
- runtime·printf("\n");
- nprint++;
- }
- }
- n++;
-
- skipped:
- waspanic = f->entry == (uintptr)runtime·sigpanic;
- wasnewproc = f->entry == (uintptr)runtime·newproc || f->entry == (uintptr)runtime·deferproc;
-
- // Do not unwind past the bottom of the stack.
- if(flr == nil)
- break;
-
- // Unwind to next frame.
- frame.fn = flr;
- frame.pc = frame.lr;
- frame.lr = 0;
- frame.sp = frame.fp;
- frame.fp = 0;
- }
-
- if(pcbuf == nil && callback == nil)
- n = nprint;
-
- // If callback != nil, we're being called to gather stack information during
- // garbage collection or stack growth. In that context, require that we used
- // up the entire defer stack. If not, then there is a bug somewhere and the
- // garbage collection or stack growth may not have seen the correct picture
- // of the stack. Crash now instead of silently executing the garbage collection
- // or stack copy incorrectly and setting up for a mysterious crash later.
- //
- // Note that panic != nil is okay here: there can be leftover panics,
- // because the defers on the panic stack do not nest in frame order as
- // they do on the defer stack. If you have:
- //
- // frame 1 defers d1
- // frame 2 defers d2
- // frame 3 defers d3
- // frame 4 panics
- // frame 4's panic starts running defers
- // frame 5, running d3, defers d4
- // frame 5 panics
- // frame 5's panic starts running defers
- // frame 6, running d4, garbage collects
- // frame 6, running d2, garbage collects
- //
- // During the execution of d4, the panic stack is d4 -> d3, which
- // is nested properly, and we'll treat frame 3 as resumable, because we
- // can find d3. (And in fact frame 3 is resumable. If d4 recovers
- // and frame 5 continues running, d3, d3 can recover and we'll
- // resume execution in (returning from) frame 3.)
- //
- // During the execution of d2, however, the panic stack is d2 -> d3,
- // which is inverted. The scan will match d2 to frame 2 but having
- // d2 on the stack until then means it will not match d3 to frame 3.
- // This is okay: if we're running d2, then all the defers after d2 have
- // completed and their corresponding frames are dead. Not finding d3
- // for frame 3 means we'll set frame 3's continpc == 0, which is correct
- // (frame 3 is dead). At the end of the walk the panic stack can thus
- // contain defers (d3 in this case) for dead frames. The inversion here
- // always indicates a dead frame, and the effect of the inversion on the
- // scan is to hide those dead frames, so the scan is still okay:
- // what's left on the panic stack are exactly (and only) the dead frames.
- //
- // We require callback != nil here because only when callback != nil
- // do we know that gentraceback is being called in a "must be correct"
- // context as opposed to a "best effort" context. The tracebacks with
- // callbacks only happen when everything is stopped nicely.
- // At other times, such as when gathering a stack for a profiling signal
- // or when printing a traceback during a crash, everything may not be
- // stopped nicely, and the stack walk may not be able to complete.
- // It's okay in those situations not to use up the entire defer stack:
- // incomplete information then is still better than nothing.
- if(callback != nil && n < max && defer != nil) {
- if(defer != nil)
- runtime·printf("runtime: g%D: leftover defer argp=%p pc=%p\n", gp->goid, defer->argp, defer->pc);
- if(panic != nil)
- runtime·printf("runtime: g%D: leftover panic argp=%p pc=%p\n", gp->goid, panic->defer->argp, panic->defer->pc);
- for(defer = gp->defer; defer != nil; defer = defer->link)
- runtime·printf("\tdefer %p argp=%p pc=%p\n", defer, defer->argp, defer->pc);
- for(panic = gp->panic; panic != nil; panic = panic->link) {
- runtime·printf("\tpanic %p defer %p", panic, panic->defer);
- if(panic->defer != nil)
- runtime·printf(" argp=%p pc=%p", panic->defer->argp, panic->defer->pc);
- runtime·printf("\n");
- }
- runtime·throw("traceback has leftover defers or panics");
- }
-
- return n;
-}
-
-void
-runtime·printcreatedby(G *gp)
-{
- int32 line;
- uintptr pc, tracepc;
- Func *f;
- String file;
-
- // Show what created goroutine, except main goroutine (goid 1).
- if((pc = gp->gopc) != 0 && (f = runtime·findfunc(pc)) != nil &&
- runtime·showframe(f, gp) && gp->goid != 1) {
- runtime·printf("created by %s\n", runtime·funcname(f));
- tracepc = pc; // back up to CALL instruction for funcline.
- if(pc > f->entry)
- tracepc -= PCQuantum;
- line = runtime·funcline(f, tracepc, &file);
- runtime·printf("\t%S:%d", file, line);
- if(pc > f->entry)
- runtime·printf(" +%p", (uintptr)(pc - f->entry));
- runtime·printf("\n");
- }
-}
-
-void
-runtime·traceback(uintptr pc, uintptr sp, uintptr lr, G *gp)
-{
- int32 n;
-
- USED(lr);
-
- if(gp->status == Gsyscall) {
- // Override signal registers if blocked in system call.
- pc = gp->syscallpc;
- sp = gp->syscallsp;
- }
-
- // Print traceback. By default, omits runtime frames.
- // If that means we print nothing at all, repeat forcing all frames printed.
- n = runtime·gentraceback(pc, sp, 0, gp, 0, nil, TracebackMaxFrames, nil, nil, false);
- if(n == 0)
- n = runtime·gentraceback(pc, sp, 0, gp, 0, nil, TracebackMaxFrames, nil, nil, true);
- if(n == TracebackMaxFrames)
- runtime·printf("...additional frames elided...\n");
- runtime·printcreatedby(gp);
-}
-
-int32
-runtime·callers(int32 skip, uintptr *pcbuf, int32 m)
-{
- uintptr pc, sp;
-
- sp = runtime·getcallersp(&skip);
- pc = (uintptr)runtime·getcallerpc(&skip);
-
- return runtime·gentraceback(pc, sp, 0, g, skip, pcbuf, m, nil, nil, false);
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-20 22:43:20 +0000