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platform_system_core
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Add load base to map for relocation packing. 

The new linker relocation packing support uses non-zero load bases,
so we better handle them properly.

Also print out the load base for a map if it's non-zero.

Bug: 20687795
Change-Id: Iec2d1db2051e7b4a278c1dfa57d745128a7f2974
This commit is contained in:
Christopher Ferris 2015-05-01 15:02:03 -07:00
parent f1a58f8f33
commit 329ed7dae4
5 changed files with 26 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
debuggerd/tombstone.cpp
View File

@ -379,6 +379,9 @@ static void dump_all_maps(Backtrace* backtrace, BacktraceMap* map, log_t* log, p
line += " (BuildId: " + build_id + ")";
}
}
if (it->load_base != 0) {
line += android::base::StringPrintf(" (load base 0x%" PRIxPTR ")", it->load_base);
}
_LOG(log, logtype::MAPS, "%s\n", line.c_str());
}
if (print_fault_address_marker) {

9
include/backtrace/BacktraceMap.h
View File

@ -37,6 +37,7 @@ struct backtrace_map_t {
uintptr_t start;
uintptr_t end;
uintptr_t load_base;
int flags;
std::string name;
};
@ -82,6 +83,14 @@ public:
return map.end > 0;
}
static uintptr_t GetRelativePc(const backtrace_map_t& map, uintptr_t pc) {
if (IsValid(map)) {
return pc - map.start + map.load_base;
} else {
return pc;
}
}
protected:
BacktraceMap(pid_t pid);

7
libbacktrace/Backtrace.cpp
View File

@ -97,12 +97,7 @@ std::string Backtrace::FormatFrameData(const backtrace_frame_data_t* frame) {
map_name = "<unknown>";
}
uintptr_t relative_pc;
if (BacktraceMap::IsValid(frame->map)) {
relative_pc = frame->pc - frame->map.start;
} else {
relative_pc = frame->pc;
}
uintptr_t relative_pc = BacktraceMap::GetRelativePc(frame->map, frame->pc);
std::string line(StringPrintf("#%02zu pc %" PRIPTR " %s", frame->num, relative_pc, map_name));
if (!frame->func_name.empty()) {

2
libbacktrace/UnwindMap.cpp
View File

@ -51,6 +51,7 @@ bool UnwindMap::GenerateMap() {
map.start = unw_map.start;
map.end = unw_map.end;
map.load_base = unw_map.load_base;
map.flags = unw_map.flags;
map.name = unw_map.path;
@ -91,6 +92,7 @@ bool UnwindMapLocal::GenerateMap() {
map.start = unw_map.start;
map.end = unw_map.end;
map.load_base = unw_map.load_base;
map.flags = unw_map.flags;
map.name = unw_map.path;

11
libbacktrace/backtrace_test.cpp
View File

@ -771,6 +771,7 @@ TEST(libbacktrace, format_test) {
// Check map name empty, but exists.
frame.map.start = 1;
frame.map.end = 1;
frame.map.load_base = 0;
#if defined(__LP64__)
EXPECT_EQ("#01 pc 0000000000000001 <unknown>",
#else
@ -806,6 +807,16 @@ TEST(libbacktrace, format_test) {
EXPECT_EQ("#01 pc 0000000012345678 MapFake (ProcFake+645)",
#else
EXPECT_EQ("#01 pc 12345678 MapFake (ProcFake+645)",
#endif
backtrace->FormatFrameData(&frame));
// Check func_name is set, func offset is non-zero, and load_base is non-zero.
frame.func_offset = 645;
frame.map.load_base = 100;
#if defined(__LP64__)
EXPECT_EQ("#01 pc 00000000123456dc MapFake (ProcFake+645)",
#else
EXPECT_EQ("#01 pc 123456dc MapFake (ProcFake+645)",
#endif
backtrace->FormatFrameData(&frame));
}