Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Loader: Support HI16/16 pairs, not just LO16 #17602

Merged
merged 2 commits into from
Jun 19, 2023
Merged

Loader: Support HI16/16 pairs, not just LO16 #17602

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
a9668bd
Debugger: More useful tag for section suballocs.
unknownbrackets Jun 19, 2023
b2b61d5
Loader: Support HI16/16 pairs, not just LO16.
unknownbrackets Jun 19, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
51 changes: 33 additions & 18 deletions Core/ELF/ElfReader.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -154,26 +154,41 @@ bool ElfReader::LoadRelocations(const Elf32_Rel *rels, int numRelocs) {
u16 hi = 0;
bool found = false;
for (int t = r + 1; t < numRelocs; t++) {
if ((rels[t].r_info & 0xF) == R_MIPS_LO16) {
u32 corrLoAddr = rels[t].r_offset + segmentVAddr[readwrite];
// Should have matching index and segment info, according to llvm, which makes sense.
if ((rels[t].r_info >> 8) != (rels[r].r_info >> 8)) {
WARN_LOG_REPORT(LOADER, "ELF relocation HI16/LO16 with mismatching r_info lo=%08x, hi=%08x", rels[t].r_info, rels[r].r_info);
}
if (log) {
DEBUG_LOG(LOADER, "Corresponding lo found at %08x", corrLoAddr);
}
if (Memory::IsValidAddress(corrLoAddr)) {
s16 lo = (s16)relocOps[t];
cur += lo;
cur += relocateTo;
addrToHiLo(cur, hi, lo);
found = true;
break;
int t_type = rels[t].r_info & 0xF;
if (t_type == R_MIPS_HI16)
continue;

u32 corrLoAddr = rels[t].r_offset + segmentVAddr[readwrite];

// In MotorStorm: Arctic Edge (US), these are sometimes R_MIPS_16 (instead of LO16.)
// It appears the PSP takes any relocation that is not a HI16.
if (t_type != R_MIPS_LO16) {
if (t_type != R_MIPS_16) {
// Let's play it safe for now and skip. We've only seen this type.
ERROR_LOG_REPORT(LOADER, "ELF relocation HI16/%d pair (instead of LO16) at %08x / %08x", t_type, addr, corrLoAddr);
continue;
} else {
ERROR_LOG(LOADER, "Bad corrLoAddr %08x", corrLoAddr);
WARN_LOG_REPORT(LOADER, "ELF relocation HI16/%d(16) pair (instead of LO16) at %08x / %08x", t_type, addr, corrLoAddr);
}
}

// Should have matching index and segment info, according to llvm, which makes sense.
if ((rels[t].r_info >> 8) != (rels[r].r_info >> 8)) {
WARN_LOG_REPORT(LOADER, "ELF relocation HI16/LO16 with mismatching r_info lo=%08x, hi=%08x", rels[t].r_info, rels[r].r_info);
}
if (log) {
DEBUG_LOG(LOADER, "Corresponding lo found at %08x", corrLoAddr);
}
if (Memory::IsValidAddress(corrLoAddr)) {
s16 lo = (s16)relocOps[t];
cur += lo;
cur += relocateTo;
addrToHiLo(cur, hi, lo);
found = true;
break;
} else {
ERROR_LOG(LOADER, "Bad corrLoAddr %08x", corrLoAddr);
}
}
if (!found) {
ERROR_LOG_REPORT(LOADER, "R_MIPS_HI16: could not find R_MIPS_LO16 (r=%d of %d, addr=%08x)", r, numRelocs, addr);
Expand Down Expand Up @@ -549,7 +564,7 @@ int ElfReader::LoadInto(u32 loadAddress, bool fromTop)

if (s->sh_flags & SHF_ALLOC)
{
std::string tag = name && name[0] ? StringFromFormat("ELF/%s", name) : StringFromFormat("ELF/%08x", writeAddr);
std::string tag = name && name[0] ? StringFromFormat("%s/%s", modName.c_str(), name) : StringFromFormat("%s/%08x", modName.c_str(), writeAddr);
NotifyMemInfo(MemBlockFlags::SUB_ALLOC, writeAddr, s->sh_size, tag.c_str(), tag.size());
DEBUG_LOG(LOADER,"Data Section found: %s Sitting at %08x, size %08x", name, writeAddr, (u32)s->sh_size);
}
Expand Down