yuzu/breakpad
1
0
Fork 0
mirror of https://github.com/yuzu-emu/breakpad.git synced 2024-12-31 23:05:44 +00:00
Code Issues Packages Projects Releases Wiki Activity

Issue 208: Reviewer waylonis

Browse source 
git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@209 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
ladderbreaker 2007-09-19 20:15:21 +00:00
parent 649967cfd2
commit 30dfc3d392
1 changed files with 52 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

66
src/client/mac/handler/dynamic_images.cc
View file

@ -41,29 +41,67 @@ namespace google_breakpad {
//==============================================================================
// Returns the size of the memory region containing |address| and the
// number of bytes from |address| to the end of the region.
// We potentially, will extend the size of the original
// region by the size of the following region if it's contiguous with the
// first in order to handle cases when we're reading strings and they
// straddle two vm regions.
//
static vm_size_t GetMemoryRegionSize(task_port_t target_task,
const void* address,
vm_size_t *size_to_end) {
vm_address_t stack_region_base = (vm_address_t)address;
vm_size_t stack_region_size;
vm_address_t region_base = (vm_address_t)address;
vm_size_t region_size;
natural_t nesting_level = 0;
vm_region_submap_info submap_info;
mach_msg_type_number_t info_count = VM_REGION_SUBMAP_INFO_COUNT;
// Get information about the vm region containing |address|
kern_return_t result =
vm_region_recurse(target_task, &stack_region_base, &stack_region_size,
vm_region_recurse(target_task,
&region_base,
&region_size,
&nesting_level,
reinterpret_cast<vm_region_recurse_info_t>(&submap_info),
&info_count);
if (result == KERN_SUCCESS) {
*size_to_end = stack_region_base + stack_region_size - (vm_address_t)address;
// Get distance from |address| to the end of this region
*size_to_end = region_base + region_size -(vm_address_t)address;
// If we want to handle strings as long as 4096 characters we may need
// to check if there's a vm region immediately following the first one.
// If so, we need to extend |*size_to_end| to go all the way to the end
// of the second region.
if (*size_to_end < 4096) {
// Second region starts where the first one ends
vm_address_t region_base2 =
(vm_address_t)(region_base + region_size);
vm_size_t region_size2;
// Get information about the following vm region
result =
vm_region_recurse(
target_task,
&region_base2,
&region_size2,
&nesting_level,
reinterpret_cast<vm_region_recurse_info_t>(&submap_info),
&info_count);
// Extend region_size to go all the way to the end of the 2nd region
if (result == KERN_SUCCESS
&& region_base2 == region_base + region_size) {
region_size += region_size2;
}
}
*size_to_end = region_base + region_size -(vm_address_t)address;
} else {
stack_region_size = 0;
region_size = 0;
*size_to_end = 0;
}
return stack_region_size;
return region_size;
}
#define kMaxStringLength 8192
@ -80,7 +118,7 @@ static void* ReadTaskString(task_port_t target_task,
// (or as many bytes as we can until we reach the end of the vm region).
vm_size_t size_to_end;
GetMemoryRegionSize(target_task, address, &size_to_end);
if (size_to_end > 0) {
vm_size_t size_to_read =
size_to_end > kMaxStringLength ? kMaxStringLength : size_to_end;
@ -118,7 +156,7 @@ void* ReadTaskMemory(task_port_t target_task,
}
vm_deallocate(mach_task_self(), (uintptr_t)local_start, local_length);
}
return result;
}
@ -186,7 +224,7 @@ DynamicImages::DynamicImages(mach_port_t task)
void DynamicImages::ReadImageInfoForTask() {
struct nlist l[8];
memset(l, 0, sizeof(l) );
// First we lookup the address of the "_dyld_all_image_infos" struct
// which lives in "dyld". This structure contains information about all
// of the loaded dynamic images.
@ -218,7 +256,7 @@ void DynamicImages::ReadImageInfoForTask() {
count*sizeof(dyld_image_info)));
image_list_.reserve(count);
for (int i = 0; i < count; ++i) {
dyld_image_info &info = infoArray[i];
@ -237,7 +275,7 @@ void DynamicImages::ReadImageInfoForTask() {
header = reinterpret_cast<mach_header*>
(ReadTaskMemory(task_, info.load_address_, header_size));
// Read the file name from the task's memory space.
char *file_path = NULL;
if (info.file_path_) {
@ -273,7 +311,7 @@ void DynamicImages::ReadImageInfoForTask() {
// sorts based on loading address
sort(image_list_.begin(), image_list_.end() );
}
}
}
}
//==============================================================================