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Add DragonFly support.

$NetBSD: patch-aa,v 1.3 2005/12/09 10:56:47 joerg Exp $

--- lrmi.c.orig	2003-05-14 03:18:12.000000000 +0000
+++ lrmi.c
@@ -23,7 +23,7 @@ ARISING FROM, OUT OF OR IN CONNECTION WI
 OTHER DEALINGS IN THE SOFTWARE.
 */
 
-#if (defined(__linux__) || defined(__NetBSD__) || defined(__FreeBSD__)) && \
+#if (defined(__linux__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)) && \
 	defined(__i386__)
 
 #include <stdio.h>
@@ -37,7 +37,7 @@ OTHER DEALINGS IN THE SOFTWARE.
 #include <sys/vm86.h>
 #endif
 
-#elif defined(__NetBSD__) || defined(__FreeBSD__)
+#elif defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
 
 #include <sys/param.h>
 #include <signal.h>
@@ -203,7 +203,7 @@ LRMI_free_real(void *m)
 
 #if defined(__linux__)
 #define DEFAULT_VM86_FLAGS 	(IF_MASK | IOPL_MASK)
-#elif defined(__NetBSD__) || defined(__FreeBSD__)
+#elif defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
 #define DEFAULT_VM86_FLAGS  (PSL_I | PSL_IOPL)
 #define TF_MASK         PSL_T
 #define VIF_MASK        PSL_VIF
@@ -211,13 +211,27 @@ LRMI_free_real(void *m)
 #define DEFAULT_STACK_SIZE 	0x1000
 #define RETURN_TO_32_INT 	255
 
+#if defined(__NetBSD__) && defined(SA_SIGINFO)
+struct gregset_overlay {
+	int gs, fs, es, ds;
+	int edi, esi, ebp, esp, ebx, edx, ecx, eax;
+	int _trapno, _err;
+	int eip, cs, eflags, uesp, ss;
+};
+#endif
+
 #if defined(__linux__)
 #define CONTEXT_REGS	context.vm.regs
 #define REG(x)			x
 #elif defined(__NetBSD__)
+#if defined(SA_SIGINFO)
+#define CONTEXT_REGS	(*(struct gregset_overlay *)&context.vm.substr.regs)
+#define REG(x)		x
+#else
 #define CONTEXT_REGS	context.vm.substr.regs
 #define REG(x)			vmsc.sc_ ## x
-#elif defined(__FreeBSD__)
+#endif /* SA_SIGINFO */
+#elif defined(__FreeBSD__) || defined(__DragonFly__)
 #define CONTEXT_REGS	context.vm.uc
 #define REG(x)			uc_mcontext.mc_ ## x
 #endif
@@ -228,16 +242,17 @@ static struct {
 	unsigned short stack_seg, stack_off;
 #if defined(__linux__) || defined(__NetBSD__)
 	struct vm86_struct vm;
-#elif defined(__FreeBSD__)
+#elif defined(__FreeBSD__) || defined(__DragonFly__)
 	struct {
 		struct vm86_init_args init;
 		ucontext_t uc;
 	} vm;
 #endif
-#if defined(__NetBSD__) || defined(__FreeBSD__)
+#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
 	int success;
 	jmp_buf env;
-	void *old_sighandler;
+	struct sigaction old_sighandler;
+	int sh_installed;
 	int vret;
 #endif
 } context = { 0 };
@@ -354,7 +369,7 @@ LRMI_init(void)
 	set_bit(RETURN_TO_32_INT, &context.vm.int_revectored);
 #elif defined(__NetBSD__)
 	set_bit(RETURN_TO_32_INT, &context.vm.int_byuser);
-#elif defined(__FreeBSD__)
+#elif defined(__FreeBSD__) || defined(__DragonFly__)
 	set_bit(RETURN_TO_32_INT, &context.vm.init.int_map);
 #endif
 
@@ -805,13 +820,25 @@ run_vm86(void)
 
 	return 0;
 }
-#elif defined(__NetBSD__) || defined(__FreeBSD__)
+#elif defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
 #if defined(__NetBSD__)
 static void
-vm86_callback(int sig, int code, struct sigcontext *sc)
+vm86_callback(int sig,
+#if defined(SA_SIGINFO)
+	      siginfo_t *info, void *vctx
+#else
+	      int code, struct sigcontext *sc
+#endif
+	      )
 {
 	/* Sync our context with what the kernel develivered to us. */
+#if defined(SA_SIGINFO)
+	int code = info->si_trap;
+	ucontext_t *ctx = vctx;
+	memcpy(&CONTEXT_REGS, &ctx->uc_mcontext.__gregs, sizeof(CONTEXT_REGS));
+#else
 	memcpy(&CONTEXT_REGS, sc, sizeof(*sc));
+#endif
 
 	switch (VM86_TYPE(code)) {
 		case VM86_INTx:
@@ -850,9 +877,13 @@ vm86_callback(int sig, int code, struct 
 	}
 
 	/* ...and sync our context back to the kernel. */
+#if defined(SA_SIGINFO)
+	memcpy(&ctx->uc_mcontext.__gregs, &CONTEXT_REGS, sizeof(CONTEXT_REGS));
+#else
 	memcpy(sc, &CONTEXT_REGS, sizeof(*sc));
+#endif
 }
-#elif defined(__FreeBSD__)
+#elif defined(__FreeBSD__) || defined(__DragonFly__)
 static void
 vm86_callback(int sig, int code, struct sigcontext *sc)
 {
@@ -899,34 +930,44 @@ vm86_callback(int sig, int code, struct 
 static int
 run_vm86(void)
 {
-	if (context.old_sighandler) {
+	struct sigaction sa;
+	int res;
+
+	if (context.sh_installed) {
 #ifdef LRMI_DEBUG
 		fprintf(stderr, "run_vm86: callback already installed\n");
 #endif
 		return (0);
 	}
 
+	memset(&sa, 0, sizeof(sa));
+#if defined(__NetBSD__) && defined(SA_SIGINFO)
+	sa.sa_sigaction = vm86_callback;
+	sa.sa_flags = SA_SIGINFO;
+#else
+	sa.sa_handler = (void (*)(int))vm86_callback;
+#endif
 #if defined(__NetBSD__)
-	context.old_sighandler = signal(SIGURG, (void (*)(int))vm86_callback);
-#elif defined(__FreeBSD__)
-	context.old_sighandler = signal(SIGBUS, (void (*)(int))vm86_callback);
+	res = sigaction(SIGURG, &sa, &context.old_sighandler);
+#elif defined(__FreeBSD__) || defined(__DragonFly__)
+	res = sigaction(SIGBUS, &sa, &context.old_sighandler);
 #endif
 
-	if (context.old_sighandler == (void *)-1) {
-		context.old_sighandler = NULL;
+	if (res < 0) {
 #ifdef LRMI_DEBUG
 		fprintf(stderr, "run_vm86: cannot install callback\n");
 #endif
 		return (0);
 	}
+	context.sh_installed = 1;
 
 	if (setjmp(context.env)) {
 #if defined(__NetBSD__)
-		(void) signal(SIGURG, context.old_sighandler);
-#elif defined(__FreeBSD__)
-		(void) signal(SIGBUS, context.old_sighandler);
+		sigaction(SIGURG, &context.old_sighandler, 0);
+#elif defined(__FreeBSD__) || defined(__DragonFly__)
+		sigaction(SIGBUS, &context.old_sighandler, 0);
 #endif
-		context.old_sighandler = NULL;
+		context.sh_installed = 0;
 
 		if (context.success)
 			return (1);
@@ -937,7 +978,7 @@ run_vm86(void)
 #if defined(__NetBSD__)
 	if (i386_vm86(&context.vm) == -1)
 		return (0);
-#elif defined(__FreeBSD__)
+#elif defined(__FreeBSD__) || defined(__DragonFly__)
 	if (i386_vm86(VM86_INIT, &context.vm.init))
 		return 0;