From 4f6dc8fddbf2905aab0c22dbab4202d7ff83d94c Mon Sep 17 00:00:00 2001
From: georgemoralis <giorgosmrls@gmail.com>
Date: Sun, 19 Nov 2023 12:55:07 +0200
Subject: [PATCH] functions libkernel to get openrorbis working (without tls)

---
 .../hle/libraries/libkernel/libkernel.cpp     | 69 +++++++++++++++++++
 1 file changed, 69 insertions(+)

diff --git a/src/core/hle/libraries/libkernel/libkernel.cpp b/src/core/hle/libraries/libkernel/libkernel.cpp
index 52e1a8e6..e0cb27bd 100644
--- a/src/core/hle/libraries/libkernel/libkernel.cpp
+++ b/src/core/hle/libraries/libkernel/libkernel.cpp
@@ -14,11 +14,14 @@
 
 #ifdef _WIN64
 #include <windows.h>
+#include <io.h>
 #endif
 #include "thread_management.h"
 
 namespace Core::Libraries::LibKernel {
 
+constexpr bool log_libkernel_file = true;  // disable it to disable logging
+
 static u64 g_stack_chk_guard = 0xDEADBEEF54321ABC;  // dummy return
 
 int32_t PS4_SYSV_ABI sceKernelReleaseDirectMemory(off_t start, size_t len) {
@@ -30,9 +33,72 @@ static PS4_SYSV_ABI void stack_chk_fail() { BREAKPOINT(); }
 
 int PS4_SYSV_ABI sceKernelMunmap(void* addr, size_t len) { BREAKPOINT(); }
 
+void PS4_SYSV_ABI sceKernelUsleep(unsigned int microseconds) { std::this_thread::sleep_for(std::chrono::microseconds(microseconds)); }
+
+struct iovec {
+    void* iov_base; /* Base	address. */
+    size_t iov_len; /* Length. */
+};
+
+size_t PS4_SYSV_ABI _writev(int fd, const struct iovec* iov, int iovcn) {
+    // weird it gives fd ==0 and writes to stdout , i am not sure if it that is valid (found in openorbis)
+    size_t total_written = 0;
+    for (int i = 0; i < iovcn; i++) {
+        total_written += ::fwrite(iov[i].iov_base, 1, iov[i].iov_len, stdout);
+    }
+    return total_written;
+}
+
 static thread_local int libc_error;
 int* PS4_SYSV_ABI __Error() { return &libc_error; }
 
+#define PROT_READ 0x1
+#define PROT_WRITE 0x2
+
+int PS4_SYSV_ABI sceKernelMmap(void* addr, u64 len, int prot, int flags, int fd, off_t offset, void** res) {
+    PRINT_FUNCTION_NAME();
+    if (prot > 3)  // READ,WRITE or bitwise READ | WRITE supported
+    {
+        LOG_ERROR_IF(log_libkernel_file, "sceKernelMmap prot ={} not supported\n", prot);
+    }
+    DWORD flProtect;
+    if (prot & PROT_WRITE) {
+        flProtect = PAGE_READWRITE;
+    }
+    off_t end = len + offset;
+    HANDLE mmap_fd, h;
+    if (fd == -1)
+        mmap_fd = INVALID_HANDLE_VALUE;
+    else
+        mmap_fd = (HANDLE)_get_osfhandle(fd);
+    h = CreateFileMapping(mmap_fd, NULL, flProtect, 0, end, NULL);
+    int k = GetLastError();
+    if (NULL == h) return -1;
+    DWORD dwDesiredAccess;
+    if (prot & PROT_WRITE)
+        dwDesiredAccess = FILE_MAP_WRITE;
+    else
+        dwDesiredAccess = FILE_MAP_READ;
+    void* ret = MapViewOfFile(h, dwDesiredAccess, 0, offset, len);
+    if (ret == NULL) {
+        CloseHandle(h);
+        ret = nullptr;
+    }
+    *res = ret;
+    return 0;
+}
+
+PS4_SYSV_ABI void* posix_mmap(void* addr, u64 len, int prot, int flags, int fd, u64 offset) {
+    void* ptr;
+    LOG_INFO_IF(log_libkernel_file, "posix mmap redirect to sceKernelMmap\n");
+    // posix call the difference is that there is a different behaviour when it doesn't return 0 or SCE_OK
+    int result = sceKernelMmap(addr, len, prot, flags, fd, offset, &ptr);
+    if (result != 0) {
+        BREAKPOINT();
+    }
+    return ptr;
+}
+
 void LibKernel_Register(Loader::SymbolsResolver* sym) {
     // obj
     LIB_OBJ("f7uOxY9mM1U", "libkernel", 1, "libkernel", 1, 1, &g_stack_chk_guard);
@@ -49,6 +115,9 @@ void LibKernel_Register(Loader::SymbolsResolver* sym) {
     LIB_FUNCTION("WslcK1FQcGI", "libkernel", 1, "libkernel", 1, 1, Kernel::sceKernelIsNeoMode);
     LIB_FUNCTION("Ou3iL1abvng", "libkernel", 1, "libkernel", 1, 1, stack_chk_fail);
     LIB_FUNCTION("9BcDykPmo1I", "libkernel", 1, "libkernel", 1, 1, __Error);
+    LIB_FUNCTION("BPE9s9vQQXo", "libkernel", 1, "libkernel", 1, 1, posix_mmap);
+    LIB_FUNCTION("1jfXLRVzisc", "libkernel", 1, "libkernel", 1, 1, sceKernelUsleep);
+    LIB_FUNCTION("YSHRBRLn2pI", "libkernel", 1, "libkernel", 1, 1, _writev);
 
     Core::Libraries::LibKernel::fileSystemSymbolsRegister(sym);
     Core::Libraries::LibKernel::timeSymbolsRegister(sym);