first commit

main.cpp

@@ -0,0 +1,97 @@
+#include "common.h"
+#include <asm/ldt.h>
+#include <errno.h>
+#include <memory>
+#include <sys/mman.h>
+#include <sys/syscall.h>
+
+uint32_t wibo::lastError = 0;
+char *wibo::commandLine;
+
+void stub() {
+	// should go through all the functions imported by mwcceppc.exe
+	// and create template stubs for them, at least...
+	printf("Unhandled function\n");
+	exit(0);
+}
+
+uint32_t __attribute__((stdcall)) CoInitialize(void *pvReserved) {
+	printf("CoInitialize(...)\n");
+	return 0; // S_OK I think?
+}
+
+void *wibo::resolveStubByName(const char *dllName, const char *funcName) {
+	if (strcmp(dllName, "KERNEL32.dll") == 0) {
+		void *func = wibo::resolveKernel32(funcName);
+		if (func)
+			return func;
+	}
+	if (strcmp(dllName, "ADVAPI32.dll") == 0) {
+		void *func = wibo::resolveAdvApi32(funcName);
+		if (func)
+			return func;
+	}
+	if (strcmp(dllName, "ole32.dll") == 0) {
+		if (strcmp(funcName, "CoInitialize") == 0) return (void *) CoInitialize;
+	}
+
+	printf("Missing function: %s (%s)\n", dllName, funcName);
+	return (void *) stub;
+}
+
+void *wibo::resolveStubByOrdinal(const char *dllName, uint16_t ordinal) {
+	return (void *) stub;
+}
+
+// Windows Thread Information Block
+struct TIB {
+	void *sehFrame;
+	void *stackBase;
+	void *stackLimit;
+	void *subSystemTib;
+	void *fiberData;
+	void *arbitraryDataSlot;
+	TIB *tib;
+};
+
+int main(int argc, char **argv) {
+	// Create TIB
+	TIB tib;
+	tib.tib = &tib;
+
+	struct user_desc tibDesc;
+	tibDesc.entry_number = 0;
+	tibDesc.base_addr = (unsigned int) &tib;
+	tibDesc.limit = 0x1000;
+	tibDesc.seg_32bit = 1;
+	tibDesc.contents = 0; // hopefully this is ok
+	tibDesc.read_exec_only = 0;
+	tibDesc.limit_in_pages = 0;
+	tibDesc.seg_not_present = 0;
+	tibDesc.useable = 1;
+	if (syscall(SYS_modify_ldt, 1, &tibDesc, sizeof tibDesc) != 0) {
+		perror("Failed to modify LDT\n");
+		return 1;
+	}
+
+	// Build a command line (todo, fill this with argv etc)
+	wibo::commandLine = new char[1024];
+	strcpy(wibo::commandLine, "mwcceppc.exe");
+
+	wibo::Executable exec;
+
+	FILE *f = fopen("mwcceppc.exe", "rb");
+	exec.loadPE(f);
+	fclose(f);
+
+	uint16_t tibSegment = (tibDesc.entry_number << 3) | 7;
+	// Invoke the damn thing
+	asm(
+		"movw %0, %%fs; call *%1"
+		:
+		: "r"(tibSegment), "r"(exec.entryPoint)
+	);
+	printf("We came back\n");
+
+	return 0;
+}