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SPU: support pure SPU code precompilation discovery
This commit is contained in:
Eladash
Elad Ashkenazi
parent
37212a632c
commit
ee9477dc21
3 changed files with 198 additions and 5 deletions
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@ -13,6 +13,7 @@
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#include "Emu/VFS.h"
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#include "Emu/Cell/PPUOpcodes.h"
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#include "Emu/Cell/SPUThread.h"
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#include "Emu/Cell/PPUAnalyser.h"
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#include "Emu/Cell/lv2/sys_process.h"
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@ -1070,12 +1071,186 @@ static void ppu_check_patch_spu_images(const ppu_module& mod, const ppu_segment&
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return;
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}
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const bool is_firmware = mod.path.starts_with(vfs::get("/dev_flash/"));
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const std::string_view seg_view{ensure(mod.get_ptr<char>(seg.addr)), seg.size};
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for (usz i = seg_view.find("\177ELF"); i < seg.size; i = seg_view.find("\177ELF", i + 4))
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auto find_first_of_multiple = [](std::string_view data, std::initializer_list<std::string_view> values, usz index)
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{
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usz pos = umax;
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for (std::string_view value : values)
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{
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if (usz pos0 = data.substr(index, pos - index).find(value); pos0 != umax && pos0 + index < pos)
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{
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pos = pos0 + index;
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}
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}
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return pos;
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};
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extern void utilize_spu_data_segment(u32 vaddr, const void* ls_data_vaddr, u32 size);
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// Search for [stqd lr,0x10(sp)] instruction or ELF file signature, whichever comes first
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const std::initializer_list<std::string_view> prefixes = {"\177ELF"sv, "\x24\0\x40\x80"sv};
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usz prev_bound = 0;
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for (usz i = find_first_of_multiple(seg_view, prefixes, 0); i < seg.size; i = find_first_of_multiple(seg_view, prefixes, utils::align<u32>(i + 1, 4)))
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{
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const auto elf_header = ensure(mod.get_ptr<u8>(seg.addr + i));
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if (i % 4 == 0 && std::memcmp(elf_header, "\x24\0\x40\x80", 4) == 0)
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{
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bool next = true;
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const u32 old_i = i;
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for (u32 search = i & -128, tries = 10; tries && search >= prev_bound; tries--, search = utils::sub_saturate<u32>(search, 128))
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{
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if (seg_view[search] != 0x42 && seg_view[search] != 0x43)
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{
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continue;
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}
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const u32 inst1 = read_from_ptr<be_t<u32>>(seg_view, search);
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const u32 inst2 = read_from_ptr<be_t<u32>>(seg_view, search + 4);
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const u32 inst3 = read_from_ptr<be_t<u32>>(seg_view, search + 8);
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const u32 inst4 = read_from_ptr<be_t<u32>>(seg_view, search + 12);
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if ((inst1 & 0xfe'00'00'7f) != 0x42000002 || (inst2 & 0xfe'00'00'7f) != 0x42000002 || (inst3 & 0xfe'00'00'7f) != 0x42000002 || (inst4 & 0xfe'00'00'7f) != 0x42000002)
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{
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continue;
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}
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ppu_log.success("Found SPURS GUID Pattern at 0x%05x", search + seg.addr);
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i = search;
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next = false;
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break;
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}
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if (next)
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{
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continue;
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}
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std::string_view ls_segment = seg_view.substr(i);
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// Bound to a bit less than LS size
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ls_segment = ls_segment.substr(0, 0x38000);
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for (usz addr_last = 0, valid_count = 0, invalid_count = 0;;)
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{
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usz instruction = ls_segment.find("\x24\0\x40\x80"sv, addr_last);
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if (instruction != umax)
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{
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if (instruction % 4 != i % 4)
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{
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// Unaligned, continue
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addr_last = instruction + (i % 4 - instruction % 4) % 4;
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continue;
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}
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// FIXME: This seems to terminate SPU code prematurely in some cases
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// Likely due to absolute branches
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if (spu_thread::is_exec_code(instruction, {reinterpret_cast<const u8*>(ls_segment.data()), ls_segment.size()}, 0))
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{
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addr_last = instruction + 4;
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valid_count++;
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invalid_count = 0;
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continue;
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}
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if (invalid_count == 0)
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{
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// Allow a single case of invalid data
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addr_last = instruction + 4;
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invalid_count++;
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continue;
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}
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addr_last = instruction;
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}
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if (addr_last >= 0x80 && valid_count >= 2)
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{
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const u32 begin = i & -128;
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u32 end = std::min<u32>(seg.size, utils::align<u32>(i + addr_last + 256, 128));
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u32 guessed_ls_addr = 0;
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// Try to guess LS address by observing the pattern for disable/enable interrupts
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// ILA R2, PC + 8
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// BIE/BID R2
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for (u32 found = 0, last_vaddr = 0, it = begin + 16; it < end - 16; it += 4)
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{
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const u32 inst1 = read_from_ptr<be_t<u32>>(seg_view, it);
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const u32 inst2 = read_from_ptr<be_t<u32>>(seg_view, it + 4);
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const u32 inst3 = read_from_ptr<be_t<u32>>(seg_view, it + 8);
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const u32 inst4 = read_from_ptr<be_t<u32>>(seg_view, it + 12);
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if ((inst1 & 0xfe'00'00'7f) == 0x42000002 && (inst2 & 0xfe'00'00'7f) == 0x42000002 && (inst3 & 0xfe'00'00'7f) == 0x42000002 && (inst4 & 0xfe'00'00'7f) == 0x42000002)
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{
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// SPURS GUID pattern
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end = it;
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ppu_log.success("Found SPURS GUID Pattern for terminagtor at 0x%05x", end + seg.addr);
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break;
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}
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if ((inst1 >> 7) % 4 == 0 && (inst1 & 0xfe'00'00'7f) == 0x42000002 && (inst2 == 0x35040100 || inst2 == 0x35080100))
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{
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const u32 addr_inst = (inst1 >> 7) % 0x40000;
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if (u32 addr_seg = addr_inst - std::min<u32>(it + 8 - begin, addr_inst))
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{
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if (last_vaddr != addr_seg)
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{
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guessed_ls_addr = 0;
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found = 0;
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}
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found++;
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last_vaddr = addr_seg;
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if (found >= 2)
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{
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// Good segment address
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guessed_ls_addr = last_vaddr;
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ppu_log.notice("Found IENABLE/IDSIABLE Pattern at 0x%05x", it + seg.addr);
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}
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}
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}
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}
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if (guessed_ls_addr)
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{
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end = begin + std::min<u32>(end - begin, SPU_LS_SIZE - guessed_ls_addr);
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}
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ppu_log.success("Found valid roaming SPU code at 0x%x..0x%x (guessed_ls_addr=0x%x)", seg.addr + begin, seg.addr + end, guessed_ls_addr);
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if (!is_firmware)
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{
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// Siginify that the base address is unknown by passing 0
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utilize_spu_data_segment(guessed_ls_addr ? guessed_ls_addr : 0x4000, seg_view.data() + begin, end - begin);
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}
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i = std::max<u32>(end, i + 4) - 4;
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prev_bound = i + 4;
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}
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else
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{
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i = old_i;
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}
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break;
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}
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continue;
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}
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// Try to load SPU image
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const spu_exec_object obj(fs::file(elf_header, seg.size - i));
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@ -1107,7 +1282,7 @@ static void ppu_check_patch_spu_images(const ppu_module& mod, const ppu_segment&
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if (prog.p_type == 0x1u /* LOAD */ && prog.p_filesz > 0u)
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{
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if (prog.p_vaddr)
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if (prog.p_vaddr && !is_firmware)
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{
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extern void utilize_spu_data_segment(u32 vaddr, const void* ls_data_vaddr, u32 size);
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@ -1126,11 +1301,13 @@ static void ppu_check_patch_spu_images(const ppu_module& mod, const ppu_segment&
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if (!name.empty())
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{
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fmt::append(dump, "\n\tSPUNAME: '%s' (image addr: 0x%x)", name, seg.addr + i);
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fmt::append(dump, "\n\tSPUNAME: '%s'", name);
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}
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}
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}
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fmt::append(dump, " (image addr: 0x%x, size: 0x%x)", seg.addr + i, obj.highest_offset);
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sha1_finish(&sha2, sha1_hash);
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// Format patch name
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@ -1173,6 +1350,9 @@ static void ppu_check_patch_spu_images(const ppu_module& mod, const ppu_segment&
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{
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ppu_loader.success("SPU executable hash: %s (<- %u)%s", hash, applied.size(), dump);
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}
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i += obj.highest_offset - 4;
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prev_bound = i + 4;
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}
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}
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