Applications: Remove i686 support

Userland/Applications/Browser/BrowserWindow.cpp

@@ -403,7 +403,7 @@ void BrowserWindow::build_menus()
         m_user_agent_spoof_actions.add_action(action);
     };
     add_user_agent("Chrome Linux Desktop", "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.128 Safari/537.36");
-    add_user_agent("Firefox Linux Desktop", "Mozilla/5.0 (X11; Linux i686; rv:87.0) Gecko/20100101 Firefox/87.0");
+    add_user_agent("Firefox Linux Desktop", "Mozilla/5.0 (X11; Linux x86_64; rv:87.0) Gecko/20100101 Firefox/87.0");
     add_user_agent("Safari macOS Desktop", "Mozilla/5.0 (Macintosh; Intel Mac OS X 11_2_3) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.3 Safari/605.1.15");
     add_user_agent("Chrome Android Mobile", "Mozilla/5.0 (Linux; Android 10) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.66 Mobile Safari/537.36");
     add_user_agent("Firefox Android Mobile", "Mozilla/5.0 (Android 11; Mobile; rv:68.0) Gecko/68.0 Firefox/86.0");

Userland/Applications/CrashReporter/main.cpp

@@ -110,11 +110,7 @@ static TitleAndText build_cpu_registers(const ELF::Core::ThreadInfo& thread_info
 
     StringBuilder builder;
 
-#if ARCH(I386)
-    builder.appendff("eax={:p} ebx={:p} ecx={:p} edx={:p}\n", regs.eax, regs.ebx, regs.ecx, regs.edx);
-    builder.appendff("ebp={:p} esp={:p} esi={:p} edi={:p}\n", regs.ebp, regs.esp, regs.esi, regs.edi);
-    builder.appendff("eip={:p} eflags={:p}", regs.eip, regs.eflags);
-#elif ARCH(X86_64)
+#if ARCH(X86_64)
     builder.appendff("rax={:p} rbx={:p} rcx={:p} rdx={:p}\n", regs.rax, regs.rbx, regs.rcx, regs.rdx);
     builder.appendff("rbp={:p} rsp={:p} rsi={:p} rdi={:p}\n", regs.rbp, regs.rsp, regs.rsi, regs.rdi);
     builder.appendff(" r8={:p}  r9={:p} r10={:p} r11={:p}\n", regs.r8, regs.r9, regs.r10, regs.r11);

Userland/Applications/Debugger/main.cpp

@@ -39,11 +39,7 @@ static void handle_sigint(int)
 
 static void handle_print_registers(PtraceRegisters const& regs)
 {
-#if ARCH(I386)
-    outln("eax={:p} ebx={:p} ecx={:p} edx={:p}", regs.eax, regs.ebx, regs.ecx, regs.edx);
-    outln("esp={:p} ebp={:p} esi={:p} edi={:p}", regs.esp, regs.ebp, regs.esi, regs.edi);
-    outln("eip={:p} eflags={:p}", regs.eip, regs.eflags);
-#elif ARCH(X86_64)
+#if ARCH(X86_64)
     outln("rax={:p} rbx={:p} rcx={:p} rdx={:p}", regs.rax, regs.rbx, regs.rcx, regs.rdx);
     outln("rsp={:p} rbp={:p} rsi={:p} rdi={:p}", regs.rsp, regs.rbp, regs.rsi, regs.rdi);
     outln("r8 ={:p} r9 ={:p} r10={:p} r11={:p}", regs.r8, regs.r9, regs.r10, regs.r11);
@@ -97,28 +93,8 @@ static bool handle_disassemble_command(DeprecatedString const& command, FlatPtr
 
 static bool handle_backtrace_command(PtraceRegisters const& regs)
 {
-#if ARCH(I386)
-    auto ebp_val = regs.ebp;
-    auto eip_val = regs.eip;
-    outln("Backtrace:");
-    while (g_debug_session->peek(eip_val).has_value() && g_debug_session->peek(ebp_val).has_value()) {
-        auto eip_symbol = g_debug_session->symbolicate(eip_val);
-        auto source_position = g_debug_session->get_source_position(eip_val);
-        DeprecatedString symbol_location = (eip_symbol.has_value() && eip_symbol->symbol != "") ? eip_symbol->symbol : "???";
-        if (source_position.has_value()) {
-            outln("{:p} in {} ({}:{})", eip_val, symbol_location, source_position->file_path, source_position->line_number);
-        } else {
-            outln("{:p} in {}", eip_val, symbol_location);
-        }
-        auto next_eip = g_debug_session->peek(ebp_val + 4);
-        auto next_ebp = g_debug_session->peek(ebp_val);
-        eip_val = (u32)next_eip.value();
-        ebp_val = (u32)next_ebp.value();
-    }
-#else
     (void)regs;
     TODO();
-#endif
     return true;
 }
 
@@ -249,9 +225,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
         VERIFY(optional_regs.has_value());
         const PtraceRegisters& regs = optional_regs.value();
-#if ARCH(I386)
-        const FlatPtr ip = regs.eip;
-#elif ARCH(X86_64)
+#if ARCH(X86_64)
         const FlatPtr ip = regs.rip;
 #elif ARCH(AARCH64)
         const FlatPtr ip = 0; // FIXME