Atmosphere/stratosphere/creport/source/creport_code_info.cpp

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#include <switch.h>
#include <cstring>
#include "creport_code_info.hpp"
void CodeList::ReadCodeRegionsFromProcess(Handle debug_handle, u64 pc, u64 lr) {
u64 code_base;
/* Guess that either PC or LR will point to a code region. This could be false. */
if (!TryFindCodeRegion(debug_handle, pc, &code_base) && !TryFindCodeRegion(debug_handle, lr, &code_base)) {
return;
}
u64 cur_ptr = code_base;
while (this->code_count < max_code_count) {
MemoryInfo mi;
u32 pi;
if (R_FAILED(svcQueryDebugProcessMemory(&mi, &pi, debug_handle, cur_ptr))) {
break;
}
if (mi.perm == Perm_Rx) {
/* Parse CodeInfo. */
this->code_infos[this->code_count].start_address = mi.addr;
this->code_infos[this->code_count].end_address = mi.addr + mi.size;
GetCodeInfoName(debug_handle, mi.addr + mi.size, this->code_infos[this->code_count].name);
GetCodeInfoBuildId(debug_handle, mi.addr + mi.size, this->code_infos[this->code_count].build_id);
this->code_count++;
}
/* If we're out of readable memory, we're done reading code. */
if (mi.type == MemType_Unmapped || mi.type == MemType_Reserved) {
break;
}
/* Verify we're not getting stuck in an infinite loop. */
if (mi.size == 0 || U64_MAX - mi.size <= cur_ptr) {
break;
}
cur_ptr += mi.size;
}
}
bool CodeList::TryFindCodeRegion(Handle debug_handle, u64 guess, u64 *address) {
MemoryInfo mi;
u32 pi;
if (R_FAILED(svcQueryDebugProcessMemory(&mi, &pi, debug_handle, guess)) || mi.perm != Perm_Rx) {
return false;
}
/* Iterate backwards until we find the memory before the code region. */
while (mi.addr > 0) {
if (R_FAILED(svcQueryDebugProcessMemory(&mi, &pi, debug_handle, guess))) {
return false;
}
if (mi.type == MemType_Unmapped) {
/* Code region will be at the end of the unmapped region preceding it. */
*address = mi.addr + mi.size;
return true;
}
guess -= 4;
}
return false;
}
void CodeList::GetCodeInfoName(u64 debug_handle, u64 rodata_addr, char *name) {
char name_in_proc[0x200];
/* Clear name. */
memset(name, 0, 0x20);
/* Read name out of .rodata. */
if (R_FAILED(svcReadDebugProcessMemory(name_in_proc, debug_handle, rodata_addr + 8, sizeof(name_in_proc)))) {
return;
}
/* Start after last slash in path. */
int ofs = strnlen(name_in_proc, sizeof(name_in_proc));
while (ofs >= 0 && name_in_proc[ofs] != '/' && name_in_proc[ofs] != '\\') {
ofs--;
}
strncpy(name, name_in_proc + ofs + 1, 0x20);
name[0x1F] = '\x00';
}
void CodeList::GetCodeInfoBuildId(u64 debug_handle, u64 rodata_addr, u8 *build_id) {
MemoryInfo mi;
u32 pi;
/* Clear build id. */
memset(build_id, 0, 0x20);
/* Verify .rodata is read-only. */
if (R_FAILED(svcQueryDebugProcessMemory(&mi, &pi, debug_handle, rodata_addr)) || mi.perm != Perm_R) {
return;
}
/* We want to read the last two pages of .rodata. */
u8 last_pages[0x2000];
size_t last_pages_size = mi.size >= 0x2000 ? 0x2000 : 0x1000;
if (R_FAILED(svcReadDebugProcessMemory(last_pages, debug_handle, mi.addr + mi.size - last_pages_size, last_pages_size))) {
return;
}
/* Find GNU\x00 to locate start of Build ID. */
for (int ofs = last_pages_size - 0x24; ofs >= 0; ofs--) {
if (memcmp(last_pages + ofs, "GNU\x00", 4) == 0) {
memcpy(build_id, last_pages + ofs + 4, 0x20);
}
}
}