From 8b5b9778886ae40f8f6f38e0cff15a89fcee4b45 Mon Sep 17 00:00:00 2001
From: lizzie <lizzie@eden-emu.dev>
Date: Sun, 7 Dec 2025 00:39:38 +0000
Subject: [PATCH] more stupid stuff

---
 src/common/virtual_buffer.cpp | 71 +++++++++++++++++++++++------------
 src/yuzu_cmd/yuzu.cpp         |  5 +++
 2 files changed, 53 insertions(+), 23 deletions(-)

diff --git a/src/common/virtual_buffer.cpp b/src/common/virtual_buffer.cpp
index 3e5f327245..d444e81edf 100644
--- a/src/common/virtual_buffer.cpp
+++ b/src/common/virtual_buffer.cpp
@@ -11,7 +11,9 @@
 #endif
 
 #ifdef __OPENORBIS__
+#include <ranges>
 #include <csignal>
+#include <boost/container/static_vector.hpp>
 #endif
 
 #include "common/assert.h"
@@ -28,10 +30,54 @@
 #   ifndef MAP_VOID
 #       define MAP_VOID 0x100
 #   endif
+// sigaction(2) has a motherfucking bug on musl where the thing isnt even properly prefixed
+#   undef sa_sigaction
+#   define sa_sigaction __sa_handler.__sa_sigaction
 #endif
 
 namespace Common {
 
+#ifdef __OPENORBIS__
+static struct sigaction old_sa_segv;
+static boost::container::static_vector<std::pair<void*, size_t>, 16> swap_regions;
+static void SwapHandler(int sig, siginfo_t* si, void* raw_context) {
+    if (std::ranges::find_if(swap_regions, [addr = si->si_addr](auto const& e) {
+        return uintptr_t(addr) >= uintptr_t(e.first) && uintptr_t(addr) < uintptr_t(e.first) + e.second;
+    }) != swap_regions.end()) {
+        size_t const page_size = 4096;
+        size_t const page_mask = ~0xfff;
+        // should replace the existing mapping... ugh
+        void* aligned_addr = reinterpret_cast<void*>(uintptr_t(si->si_addr) & page_mask);
+        void* res = mmap(aligned_addr, page_size, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_ANON | MAP_PRIVATE, -1, 0);
+        ASSERT(res != MAP_FAILED);
+    } else {
+        struct sigaction* retry_sa = &old_sa_segv;
+        if ((retry_sa->sa_flags & SA_SIGINFO) != 0) {
+            retry_sa->sa_sigaction(sig, si, raw_context);
+        } else if (retry_sa->sa_handler == SIG_DFL) {
+            signal(sig, SIG_DFL);
+        } else if (retry_sa->sa_handler == SIG_IGN) {
+            // ignore?
+        } else {
+            retry_sa->sa_handler(sig);
+        }
+    }
+}
+
+bool InitSwap() noexcept {
+    struct sigaction sa;
+    sa.sa_handler = NULL;
+    sa.sa_sigaction = &SwapHandler;
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = SA_SIGINFO | SA_RESTART;
+    return sigaction(SIGSEGV, &sa, &old_sa_segv) == 0;
+}
+#else
+bool InitSwap() noexcept {
+    return true;
+}
+#endif
+
 void* AllocateMemoryPages(std::size_t size) noexcept {
 #ifdef _WIN32
     void* addr = VirtualAlloc(nullptr, size, MEM_COMMIT, PAGE_READWRITE);
@@ -39,6 +85,7 @@ void* AllocateMemoryPages(std::size_t size) noexcept {
 #elif defined(__OPENORBIS__)
     void* addr = mmap(nullptr, size, PROT_NONE, MAP_VOID | MAP_PRIVATE, -1, 0);
     ASSERT(addr != MAP_FAILED);
+    swap_regions.emplace_back(addr, size);
 #else
     void* addr = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
     ASSERT(addr != MAP_FAILED);
@@ -50,33 +97,11 @@ void FreeMemoryPages(void* addr, [[maybe_unused]] std::size_t size) noexcept {
     if (!addr)
         return;
 #ifdef _WIN32
-    VirtualFree(addr, 0, MEM_RELEASE)
+    VirtualFree(addr, 0, MEM_RELEASE);
 #else
     int rc = munmap(addr, size);
     ASSERT(rc == 0);
 #endif
 }
 
-#ifdef __OPENORBIS__
-static struct sigaction old_sa_segv;
-static void SwapHandler(int sig, siginfo_t* si, void* raw_context) {
-    void* aligned_addr = reinterpret_cast<void*>(uintptr_t(si->si_addr) & ~0xfff);
-    void* res = mmap(aligned_addr, 4096, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_ANON | MAP_PRIVATE, -1, 0);
-    ASSERT(res != MAP_FAILED);
-}
-
-bool InitSwap() noexcept {
-    struct sigaction sa;
-    sa.sa_handler = NULL;
-    sa.__sa_handler.__sa_sigaction = &SwapHandler;
-    sigemptyset(&sa.sa_mask);
-    sa.sa_flags = SA_SIGINFO | SA_RESTART;
-    return sigaction(SIGSEGV, &sa, &old_sa_segv) == 0;
-}
-#else
-bool InitSwap() noexcept {
-    return true;
-}
-#endif
-
 } // namespace Common
diff --git a/src/yuzu_cmd/yuzu.cpp b/src/yuzu_cmd/yuzu.cpp
index da2fd84c15..0a50e44d85 100644
--- a/src/yuzu_cmd/yuzu.cpp
+++ b/src/yuzu_cmd/yuzu.cpp
@@ -236,6 +236,11 @@ int main(int argc, char** argv) {
         // clang-format on
     };
 
+#ifdef __OPENORBIS__
+    // PS4 will use this path by default UNLESS overriden; this is so users
+    // can quickly launch whatever they want.
+    filepath = "/data/eden/games/test.nro";
+#endif
     while (optind < argc) {
         int arg = getopt_long(argc, argv, "g:fhvp::c:u:d:", long_options, &option_index);
         if (arg != -1) {