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Diffstat (limited to 'src/pkg/runtime/traceback_arm.c')
-rw-r--r-- | src/pkg/runtime/traceback_arm.c | 357 |
1 files changed, 0 insertions, 357 deletions
diff --git a/src/pkg/runtime/traceback_arm.c b/src/pkg/runtime/traceback_arm.c deleted file mode 100644 index 30f43d54c..000000000 --- a/src/pkg/runtime/traceback_arm.c +++ /dev/null @@ -1,357 +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. - -#include "runtime.h" -#include "arch_GOARCH.h" -#include "malloc.h" -#include "funcdata.h" - -void runtime·sigpanic(void); -void runtime·newproc(void); -void runtime·deferproc(void); - -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 x, tracepc, sparg; - bool waspanic, wasnewproc, printing; - Func *f, *flr; - Stkframe frame; - Stktop *stk; - String file; - Panic *panic; - Defer *defer; - - 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; - lr0 = 0; - } else { - pc0 = gp->sched.pc; - sp0 = gp->sched.sp; - lr0 = gp->sched.lr; - } - } - - nprint = 0; - runtime·memclr((byte*)&frame, sizeof frame); - frame.pc = pc0; - frame.lr = lr0; - 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 = frame.lr; - frame.lr = 0; - } - - 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; - 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; - - // Found an actual function. - // Derive frame pointer and link register. - if(frame.fp == 0) - frame.fp = frame.sp + runtime·funcspdelta(f, frame.pc); - if(runtime·topofstack(f)) { - frame.lr = 0; - flr = nil; - } else if(f->entry == (uintptr)runtime·jmpdefer) { - // jmpdefer modifies SP/LR/PC non-atomically. - // If a profiling interrupt arrives during jmpdefer, - // the stack unwind may see a mismatched register set - // and get confused. Stop if we see PC within jmpdefer - // to avoid that confusion. - // See golang.org/issue/8153. - // This check can be deleted if jmpdefer is changed - // to restore all three atomically using pop. - if(callback != nil) - runtime·throw("traceback_arm: found jmpdefer when tracing with callback"); - frame.lr = 0; - flr = nil; - } else { - if((n == 0 && frame.sp < frame.fp) || frame.lr == 0) - frame.lr = *(uintptr*)frame.sp; - flr = runtime·findfunc(frame.lr); - if(flr == nil) { - // This happens if you get a profiling interrupt at just the wrong time. - // In that context it is okay to stop early. - // But if callback is set, we're doing a garbage collection and must - // get everything, so crash loudly. - if(callback != nil) { - runtime·printf("runtime: unexpected return pc for %s called from %p\n", runtime·funcname(f), frame.lr); - runtime·throw("unknown caller pc"); - } - } - } - - frame.varp = (byte*)frame.fp; - - // 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 + sizeof(uintptr); - 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 ARM that's just the standard bottom-of-stack plus 1 word for - // the saved LR. If the previous frame was a direct call to newproc/deferproc, - // however, the SP is three words lower than normal. - // If the function has no frame at all - perhaps it just started, or perhaps - // it is a leaf with no local variables - then we cannot possibly find its - // SP in a defer, and we might confuse its SP for its caller's SP, so - // set sparg=0 in that case. - sparg = 0; - if(frame.fp != frame.sp) { - sparg = frame.sp + sizeof(uintreg); - if(wasnewproc) - sparg += 3*sizeof(uintreg); - } - - // 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 -= sizeof(uintptr); - 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.pc = frame.lr; - frame.fn = flr; - frame.lr = 0; - frame.sp = frame.fp; - frame.fp = 0; - - // sighandler saves the lr on stack before faking a call to sigpanic - if(waspanic) { - x = *(uintptr*)frame.sp; - frame.sp += 4; - frame.fn = f = runtime·findfunc(frame.pc); - if(f == nil) - frame.pc = x; - else if(f->frame == 0) - frame.lr = x; - } - } - - if(pcbuf == nil && callback == nil) - n = nprint; - - // For rationale, see long comment in traceback_x86.c. - 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; - - if(gp->status == Gsyscall) { - // Override signal registers if blocked in system call. - pc = gp->syscallpc; - sp = gp->syscallsp; - lr = 0; - } - - // 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, lr, gp, 0, nil, TracebackMaxFrames, nil, nil, false); - if(n == 0) - runtime·gentraceback(pc, sp, lr, gp, 0, nil, TracebackMaxFrames, nil, nil, true); - if(n == TracebackMaxFrames) - runtime·printf("...additional frames elided...\n"); - runtime·printcreatedby(gp); -} - -// func caller(n int) (pc uintptr, file string, line int, ok bool) -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); -} |