c18d5c05cb
This matches the original libunwind API. This also unifies the type between ARM EHABI and the other configurations, and allows getting rid of a number of casts in log messages. The cursor size updates for ppc and or1k are untested, but unw_proc_info_t shrinks by 4 uint64_t units on i386 at least. Differential Revision: https://reviews.llvm.org/D39365 llvm-svn: 316942
507 lines
20 KiB
C
507 lines
20 KiB
C
//===------------------------- UnwindLevel1.c -----------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//
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// Implements C++ ABI Exception Handling Level 1 as documented at:
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// http://mentorembedded.github.io/cxx-abi/abi-eh.html
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// using libunwind
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//
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//===----------------------------------------------------------------------===//
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// ARM EHABI does not specify _Unwind_{Get,Set}{GR,IP}(). Thus, we are
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// defining inline functions to delegate the function calls to
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// _Unwind_VRS_{Get,Set}(). However, some applications might declare the
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// function protetype directly (instead of including <unwind.h>), thus we need
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// to export these functions from libunwind.so as well.
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#define _LIBUNWIND_UNWIND_LEVEL1_EXTERNAL_LINKAGE 1
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#include <inttypes.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "libunwind.h"
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#include "unwind.h"
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#include "config.h"
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#if !defined(_LIBUNWIND_ARM_EHABI) && !defined(__USING_SJLJ_EXCEPTIONS__)
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static _Unwind_Reason_Code
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unwind_phase1(unw_context_t *uc, unw_cursor_t *cursor, _Unwind_Exception *exception_object) {
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unw_init_local(cursor, uc);
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// Walk each frame looking for a place to stop.
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bool handlerNotFound = true;
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while (handlerNotFound) {
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// Ask libunwind to get next frame (skip over first which is
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// _Unwind_RaiseException).
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int stepResult = unw_step(cursor);
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if (stepResult == 0) {
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_LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): unw_step() reached "
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"bottom => _URC_END_OF_STACK",
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(void *)exception_object);
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return _URC_END_OF_STACK;
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} else if (stepResult < 0) {
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_LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): unw_step failed => "
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"_URC_FATAL_PHASE1_ERROR",
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(void *)exception_object);
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return _URC_FATAL_PHASE1_ERROR;
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}
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// See if frame has code to run (has personality routine).
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unw_proc_info_t frameInfo;
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unw_word_t sp;
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if (unw_get_proc_info(cursor, &frameInfo) != UNW_ESUCCESS) {
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_LIBUNWIND_TRACE_UNWINDING("unwind_phase1(ex_ojb=%p): unw_get_proc_info "
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"failed => _URC_FATAL_PHASE1_ERROR",
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(void *)exception_object);
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return _URC_FATAL_PHASE1_ERROR;
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}
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// When tracing, print state information.
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if (_LIBUNWIND_TRACING_UNWINDING) {
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char functionBuf[512];
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const char *functionName = functionBuf;
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unw_word_t offset;
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if ((unw_get_proc_name(cursor, functionBuf, sizeof(functionBuf),
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&offset) != UNW_ESUCCESS) ||
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(frameInfo.start_ip + offset > frameInfo.end_ip))
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functionName = ".anonymous.";
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unw_word_t pc;
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unw_get_reg(cursor, UNW_REG_IP, &pc);
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_LIBUNWIND_TRACE_UNWINDING(
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"unwind_phase1(ex_ojb=%p): pc=0x%" PRIxPTR ", start_ip=0x%" PRIxPTR
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", func=%s, lsda=0x%" PRIxPTR ", personality=0x%" PRIxPTR "",
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(void *)exception_object, pc, frameInfo.start_ip, functionName,
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frameInfo.lsda, frameInfo.handler);
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}
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// If there is a personality routine, ask it if it will want to stop at
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// this frame.
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if (frameInfo.handler != 0) {
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__personality_routine p =
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(__personality_routine)(uintptr_t)(frameInfo.handler);
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_LIBUNWIND_TRACE_UNWINDING(
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"unwind_phase1(ex_ojb=%p): calling personality function %p",
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(void *)exception_object, (void *)(uintptr_t)p);
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_Unwind_Reason_Code personalityResult =
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(*p)(1, _UA_SEARCH_PHASE, exception_object->exception_class,
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exception_object, (struct _Unwind_Context *)(cursor));
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switch (personalityResult) {
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case _URC_HANDLER_FOUND:
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// found a catch clause or locals that need destructing in this frame
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// stop search and remember stack pointer at the frame
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handlerNotFound = false;
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unw_get_reg(cursor, UNW_REG_SP, &sp);
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exception_object->private_2 = (uintptr_t)sp;
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_LIBUNWIND_TRACE_UNWINDING(
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"unwind_phase1(ex_ojb=%p): _URC_HANDLER_FOUND",
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(void *)exception_object);
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return _URC_NO_REASON;
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case _URC_CONTINUE_UNWIND:
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_LIBUNWIND_TRACE_UNWINDING(
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"unwind_phase1(ex_ojb=%p): _URC_CONTINUE_UNWIND",
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(void *)exception_object);
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// continue unwinding
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break;
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default:
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// something went wrong
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_LIBUNWIND_TRACE_UNWINDING(
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"unwind_phase1(ex_ojb=%p): _URC_FATAL_PHASE1_ERROR",
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(void *)exception_object);
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return _URC_FATAL_PHASE1_ERROR;
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}
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}
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}
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return _URC_NO_REASON;
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}
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static _Unwind_Reason_Code
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unwind_phase2(unw_context_t *uc, unw_cursor_t *cursor, _Unwind_Exception *exception_object) {
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unw_init_local(cursor, uc);
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_LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p)",
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(void *)exception_object);
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// Walk each frame until we reach where search phase said to stop.
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while (true) {
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// Ask libunwind to get next frame (skip over first which is
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// _Unwind_RaiseException).
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int stepResult = unw_step(cursor);
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if (stepResult == 0) {
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_LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): unw_step() reached "
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"bottom => _URC_END_OF_STACK",
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(void *)exception_object);
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return _URC_END_OF_STACK;
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} else if (stepResult < 0) {
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_LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): unw_step failed => "
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"_URC_FATAL_PHASE1_ERROR",
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(void *)exception_object);
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return _URC_FATAL_PHASE2_ERROR;
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}
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// Get info about this frame.
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unw_word_t sp;
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unw_proc_info_t frameInfo;
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unw_get_reg(cursor, UNW_REG_SP, &sp);
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if (unw_get_proc_info(cursor, &frameInfo) != UNW_ESUCCESS) {
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_LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): unw_get_proc_info "
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"failed => _URC_FATAL_PHASE1_ERROR",
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(void *)exception_object);
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return _URC_FATAL_PHASE2_ERROR;
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}
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// When tracing, print state information.
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if (_LIBUNWIND_TRACING_UNWINDING) {
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char functionBuf[512];
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const char *functionName = functionBuf;
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unw_word_t offset;
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if ((unw_get_proc_name(cursor, functionBuf, sizeof(functionBuf),
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&offset) != UNW_ESUCCESS) ||
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(frameInfo.start_ip + offset > frameInfo.end_ip))
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functionName = ".anonymous.";
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_LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): start_ip=0x%" PRIxPTR
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", func=%s, sp=0x%" PRIxPTR ", lsda=0x%" PRIxPTR
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", personality=0x%" PRIxPTR,
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(void *)exception_object, frameInfo.start_ip,
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functionName, sp, frameInfo.lsda,
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frameInfo.handler);
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}
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// If there is a personality routine, tell it we are unwinding.
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if (frameInfo.handler != 0) {
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__personality_routine p =
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(__personality_routine)(uintptr_t)(frameInfo.handler);
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_Unwind_Action action = _UA_CLEANUP_PHASE;
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if (sp == exception_object->private_2) {
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// Tell personality this was the frame it marked in phase 1.
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action = (_Unwind_Action)(_UA_CLEANUP_PHASE | _UA_HANDLER_FRAME);
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}
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_Unwind_Reason_Code personalityResult =
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(*p)(1, action, exception_object->exception_class, exception_object,
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(struct _Unwind_Context *)(cursor));
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switch (personalityResult) {
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case _URC_CONTINUE_UNWIND:
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// Continue unwinding
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_LIBUNWIND_TRACE_UNWINDING(
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"unwind_phase2(ex_ojb=%p): _URC_CONTINUE_UNWIND",
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(void *)exception_object);
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if (sp == exception_object->private_2) {
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// Phase 1 said we would stop at this frame, but we did not...
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_LIBUNWIND_ABORT("during phase1 personality function said it would "
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"stop here, but now in phase2 it did not stop here");
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}
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break;
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case _URC_INSTALL_CONTEXT:
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_LIBUNWIND_TRACE_UNWINDING(
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"unwind_phase2(ex_ojb=%p): _URC_INSTALL_CONTEXT",
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(void *)exception_object);
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// Personality routine says to transfer control to landing pad.
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// We may get control back if landing pad calls _Unwind_Resume().
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if (_LIBUNWIND_TRACING_UNWINDING) {
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unw_word_t pc;
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unw_get_reg(cursor, UNW_REG_IP, &pc);
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unw_get_reg(cursor, UNW_REG_SP, &sp);
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_LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_ojb=%p): re-entering "
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"user code with ip=0x%" PRIxPTR
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", sp=0x%" PRIxPTR,
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(void *)exception_object, pc, sp);
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}
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unw_resume(cursor);
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// unw_resume() only returns if there was an error.
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return _URC_FATAL_PHASE2_ERROR;
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default:
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// Personality routine returned an unknown result code.
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_LIBUNWIND_DEBUG_LOG("personality function returned unknown result %d",
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personalityResult);
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return _URC_FATAL_PHASE2_ERROR;
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}
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}
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}
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// Clean up phase did not resume at the frame that the search phase
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// said it would...
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return _URC_FATAL_PHASE2_ERROR;
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}
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static _Unwind_Reason_Code
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unwind_phase2_forced(unw_context_t *uc, unw_cursor_t *cursor,
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_Unwind_Exception *exception_object,
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_Unwind_Stop_Fn stop, void *stop_parameter) {
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unw_init_local(cursor, uc);
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// Walk each frame until we reach where search phase said to stop
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while (unw_step(cursor) > 0) {
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// Update info about this frame.
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unw_proc_info_t frameInfo;
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if (unw_get_proc_info(cursor, &frameInfo) != UNW_ESUCCESS) {
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_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): unw_step "
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"failed => _URC_END_OF_STACK",
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(void *)exception_object);
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return _URC_FATAL_PHASE2_ERROR;
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}
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// When tracing, print state information.
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if (_LIBUNWIND_TRACING_UNWINDING) {
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char functionBuf[512];
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const char *functionName = functionBuf;
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unw_word_t offset;
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if ((unw_get_proc_name(cursor, functionBuf, sizeof(functionBuf),
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&offset) != UNW_ESUCCESS) ||
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(frameInfo.start_ip + offset > frameInfo.end_ip))
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functionName = ".anonymous.";
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_LIBUNWIND_TRACE_UNWINDING(
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"unwind_phase2_forced(ex_ojb=%p): start_ip=0x%" PRIxPTR
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", func=%s, lsda=0x%" PRIxPTR ", personality=0x%" PRIxPTR,
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(void *)exception_object, frameInfo.start_ip, functionName,
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frameInfo.lsda, frameInfo.handler);
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}
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// Call stop function at each frame.
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_Unwind_Action action =
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(_Unwind_Action)(_UA_FORCE_UNWIND | _UA_CLEANUP_PHASE);
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_Unwind_Reason_Code stopResult =
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(*stop)(1, action, exception_object->exception_class, exception_object,
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(struct _Unwind_Context *)(cursor), stop_parameter);
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_LIBUNWIND_TRACE_UNWINDING(
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"unwind_phase2_forced(ex_ojb=%p): stop function returned %d",
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(void *)exception_object, stopResult);
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if (stopResult != _URC_NO_REASON) {
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_LIBUNWIND_TRACE_UNWINDING(
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"unwind_phase2_forced(ex_ojb=%p): stopped by stop function",
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(void *)exception_object);
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return _URC_FATAL_PHASE2_ERROR;
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}
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// If there is a personality routine, tell it we are unwinding.
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if (frameInfo.handler != 0) {
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__personality_routine p =
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(__personality_routine)(long)(frameInfo.handler);
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_LIBUNWIND_TRACE_UNWINDING(
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"unwind_phase2_forced(ex_ojb=%p): calling personality function %p",
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(void *)exception_object, (void *)(uintptr_t)p);
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_Unwind_Reason_Code personalityResult =
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(*p)(1, action, exception_object->exception_class, exception_object,
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(struct _Unwind_Context *)(cursor));
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switch (personalityResult) {
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case _URC_CONTINUE_UNWIND:
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_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): "
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"personality returned "
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"_URC_CONTINUE_UNWIND",
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(void *)exception_object);
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// Destructors called, continue unwinding
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break;
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case _URC_INSTALL_CONTEXT:
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_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): "
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"personality returned "
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"_URC_INSTALL_CONTEXT",
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(void *)exception_object);
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// We may get control back if landing pad calls _Unwind_Resume().
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unw_resume(cursor);
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break;
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default:
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// Personality routine returned an unknown result code.
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_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): "
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"personality returned %d, "
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"_URC_FATAL_PHASE2_ERROR",
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(void *)exception_object, personalityResult);
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return _URC_FATAL_PHASE2_ERROR;
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}
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}
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}
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// Call stop function one last time and tell it we've reached the end
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// of the stack.
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_LIBUNWIND_TRACE_UNWINDING("unwind_phase2_forced(ex_ojb=%p): calling stop "
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"function with _UA_END_OF_STACK",
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(void *)exception_object);
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_Unwind_Action lastAction =
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(_Unwind_Action)(_UA_FORCE_UNWIND | _UA_CLEANUP_PHASE | _UA_END_OF_STACK);
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(*stop)(1, lastAction, exception_object->exception_class, exception_object,
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(struct _Unwind_Context *)(cursor), stop_parameter);
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// Clean up phase did not resume at the frame that the search phase said it
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// would.
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return _URC_FATAL_PHASE2_ERROR;
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}
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/// Called by __cxa_throw. Only returns if there is a fatal error.
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_LIBUNWIND_EXPORT _Unwind_Reason_Code
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_Unwind_RaiseException(_Unwind_Exception *exception_object) {
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_LIBUNWIND_TRACE_API("_Unwind_RaiseException(ex_obj=%p)",
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(void *)exception_object);
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unw_context_t uc;
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unw_cursor_t cursor;
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unw_getcontext(&uc);
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// Mark that this is a non-forced unwind, so _Unwind_Resume()
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// can do the right thing.
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exception_object->private_1 = 0;
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exception_object->private_2 = 0;
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// phase 1: the search phase
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_Unwind_Reason_Code phase1 = unwind_phase1(&uc, &cursor, exception_object);
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if (phase1 != _URC_NO_REASON)
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return phase1;
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// phase 2: the clean up phase
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return unwind_phase2(&uc, &cursor, exception_object);
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}
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/// When _Unwind_RaiseException() is in phase2, it hands control
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/// to the personality function at each frame. The personality
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/// may force a jump to a landing pad in that function, the landing
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/// pad code may then call _Unwind_Resume() to continue with the
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/// unwinding. Note: the call to _Unwind_Resume() is from compiler
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/// geneated user code. All other _Unwind_* routines are called
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/// by the C++ runtime __cxa_* routines.
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///
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/// Note: re-throwing an exception (as opposed to continuing the unwind)
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/// is implemented by having the code call __cxa_rethrow() which
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/// in turn calls _Unwind_Resume_or_Rethrow().
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_LIBUNWIND_EXPORT void
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_Unwind_Resume(_Unwind_Exception *exception_object) {
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_LIBUNWIND_TRACE_API("_Unwind_Resume(ex_obj=%p)", (void *)exception_object);
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unw_context_t uc;
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unw_cursor_t cursor;
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unw_getcontext(&uc);
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if (exception_object->private_1 != 0)
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unwind_phase2_forced(&uc, &cursor, exception_object,
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(_Unwind_Stop_Fn) exception_object->private_1,
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(void *)exception_object->private_2);
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else
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unwind_phase2(&uc, &cursor, exception_object);
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// Clients assume _Unwind_Resume() does not return, so all we can do is abort.
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_LIBUNWIND_ABORT("_Unwind_Resume() can't return");
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}
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/// Not used by C++.
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/// Unwinds stack, calling "stop" function at each frame.
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/// Could be used to implement longjmp().
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_LIBUNWIND_EXPORT _Unwind_Reason_Code
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_Unwind_ForcedUnwind(_Unwind_Exception *exception_object,
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_Unwind_Stop_Fn stop, void *stop_parameter) {
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_LIBUNWIND_TRACE_API("_Unwind_ForcedUnwind(ex_obj=%p, stop=%p)",
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(void *)exception_object, (void *)(uintptr_t)stop);
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unw_context_t uc;
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unw_cursor_t cursor;
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unw_getcontext(&uc);
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// Mark that this is a forced unwind, so _Unwind_Resume() can do
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// the right thing.
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exception_object->private_1 = (uintptr_t) stop;
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exception_object->private_2 = (uintptr_t) stop_parameter;
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// do it
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return unwind_phase2_forced(&uc, &cursor, exception_object, stop, stop_parameter);
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}
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/// Called by personality handler during phase 2 to get LSDA for current frame.
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_LIBUNWIND_EXPORT uintptr_t
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_Unwind_GetLanguageSpecificData(struct _Unwind_Context *context) {
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unw_cursor_t *cursor = (unw_cursor_t *)context;
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unw_proc_info_t frameInfo;
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uintptr_t result = 0;
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if (unw_get_proc_info(cursor, &frameInfo) == UNW_ESUCCESS)
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result = (uintptr_t)frameInfo.lsda;
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_LIBUNWIND_TRACE_API(
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"_Unwind_GetLanguageSpecificData(context=%p) => 0x%" PRIxPTR,
|
|
(void *)context, result);
|
|
if (result != 0) {
|
|
if (*((uint8_t *)result) != 0xFF)
|
|
_LIBUNWIND_DEBUG_LOG("lsda at 0x%" PRIxPTR " does not start with 0xFF",
|
|
result);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
/// Called by personality handler during phase 2 to find the start of the
|
|
/// function.
|
|
_LIBUNWIND_EXPORT uintptr_t
|
|
_Unwind_GetRegionStart(struct _Unwind_Context *context) {
|
|
unw_cursor_t *cursor = (unw_cursor_t *)context;
|
|
unw_proc_info_t frameInfo;
|
|
uintptr_t result = 0;
|
|
if (unw_get_proc_info(cursor, &frameInfo) == UNW_ESUCCESS)
|
|
result = (uintptr_t)frameInfo.start_ip;
|
|
_LIBUNWIND_TRACE_API("_Unwind_GetRegionStart(context=%p) => 0x%" PRIxPTR,
|
|
(void *)context, result);
|
|
return result;
|
|
}
|
|
|
|
|
|
/// Called by personality handler during phase 2 if a foreign exception
|
|
// is caught.
|
|
_LIBUNWIND_EXPORT void
|
|
_Unwind_DeleteException(_Unwind_Exception *exception_object) {
|
|
_LIBUNWIND_TRACE_API("_Unwind_DeleteException(ex_obj=%p)",
|
|
(void *)exception_object);
|
|
if (exception_object->exception_cleanup != NULL)
|
|
(*exception_object->exception_cleanup)(_URC_FOREIGN_EXCEPTION_CAUGHT,
|
|
exception_object);
|
|
}
|
|
|
|
/// Called by personality handler during phase 2 to get register values.
|
|
_LIBUNWIND_EXPORT uintptr_t
|
|
_Unwind_GetGR(struct _Unwind_Context *context, int index) {
|
|
unw_cursor_t *cursor = (unw_cursor_t *)context;
|
|
unw_word_t result;
|
|
unw_get_reg(cursor, index, &result);
|
|
_LIBUNWIND_TRACE_API("_Unwind_GetGR(context=%p, reg=%d) => 0x%" PRIxPTR,
|
|
(void *)context, index, result);
|
|
return (uintptr_t)result;
|
|
}
|
|
|
|
/// Called by personality handler during phase 2 to alter register values.
|
|
_LIBUNWIND_EXPORT void _Unwind_SetGR(struct _Unwind_Context *context, int index,
|
|
uintptr_t value) {
|
|
_LIBUNWIND_TRACE_API("_Unwind_SetGR(context=%p, reg=%d, value=0x%0" PRIxPTR
|
|
")",
|
|
(void *)context, index, value);
|
|
unw_cursor_t *cursor = (unw_cursor_t *)context;
|
|
unw_set_reg(cursor, index, value);
|
|
}
|
|
|
|
/// Called by personality handler during phase 2 to get instruction pointer.
|
|
_LIBUNWIND_EXPORT uintptr_t _Unwind_GetIP(struct _Unwind_Context *context) {
|
|
unw_cursor_t *cursor = (unw_cursor_t *)context;
|
|
unw_word_t result;
|
|
unw_get_reg(cursor, UNW_REG_IP, &result);
|
|
_LIBUNWIND_TRACE_API("_Unwind_GetIP(context=%p) => 0x%" PRIxPTR,
|
|
(void *)context, result);
|
|
return (uintptr_t)result;
|
|
}
|
|
|
|
/// Called by personality handler during phase 2 to alter instruction pointer,
|
|
/// such as setting where the landing pad is, so _Unwind_Resume() will
|
|
/// start executing in the landing pad.
|
|
_LIBUNWIND_EXPORT void _Unwind_SetIP(struct _Unwind_Context *context,
|
|
uintptr_t value) {
|
|
_LIBUNWIND_TRACE_API("_Unwind_SetIP(context=%p, value=0x%0" PRIxPTR ")",
|
|
(void *)context, value);
|
|
unw_cursor_t *cursor = (unw_cursor_t *)context;
|
|
unw_set_reg(cursor, UNW_REG_IP, value);
|
|
}
|
|
|
|
#endif // !defined(_LIBUNWIND_ARM_EHABI) && !defined(__USING_SJLJ_EXCEPTIONS__)
|