Exemplo n.º 1
0
Arquivo: tramp.c Projeto: ANahr/mono
static inline guint32 *
emit_prolog (guint32 *p, MonoMethodSignature *sig, guint stack_size)
{
	/* yes kids, it is this simple! */
	sparc_save_imm (p, sparc_sp, -stack_size, sparc_sp);
	return p;
}
Exemplo n.º 2
0
/**
 * mono_arch_get_throw_corlib_exception:
 *
 * Returns a function pointer which can be used to raise 
 * corlib exceptions. The returned function has the following 
 * signature: void (*func) (guint32 ex_token, guint32 offset); 
 * Here, offset is the offset which needs to be substracted from the caller IP 
 * to get the IP of the throw. Passing the offset has the advantage that it 
 * needs no relocations in the caller.
 */
gpointer
mono_arch_get_throw_corlib_exception (MonoTrampInfo **info, gboolean aot)
{
	static guint32 *start;
	static int inited = 0;
	guint32 *code;
	int reg;

	g_assert (!aot);
	if (info)
		*info = NULL;

	if (inited)
		return start;

	inited = 1;
	code = start = mono_global_codeman_reserve (64 * sizeof (guint32));

#ifdef SPARCV9
	reg = sparc_g4;
#else
	reg = sparc_g1;
#endif

	sparc_mov_reg_reg (code, sparc_o7, sparc_o2);
	sparc_save_imm (code, sparc_sp, -160, sparc_sp);

	sparc_set (code, MONO_TOKEN_TYPE_DEF, sparc_o7);
	sparc_add (code, FALSE, sparc_i0, sparc_o7, sparc_o1);
	sparc_set (code, mono_defaults.exception_class->image, sparc_o0);
	sparc_set (code, mono_exception_from_token, sparc_o7);
	sparc_jmpl (code, sparc_o7, sparc_g0, sparc_callsite);
	sparc_nop (code);

	/* Return to the caller, so exception handling does not see this frame */
	sparc_restore (code, sparc_o0, sparc_g0, sparc_o0);

	/* Compute throw ip */
	sparc_sll_imm (code, sparc_o1, 2, sparc_o1);
	sparc_sub (code, 0, sparc_o2, sparc_o1, sparc_o7);

	sparc_set (code, mono_arch_get_throw_exception (NULL, FALSE), reg);
	/* Use a jmp instead of a call so o7 is preserved */
	sparc_jmpl_imm (code, reg, 0, sparc_g0);
	sparc_nop (code);

	g_assert ((code - start) < 32);

	mono_arch_flush_icache ((guint8*)start, (guint8*)code - (guint8*)start);

	return start;
}
Exemplo n.º 3
0
/**
 * mono_arch_get_throw_exception_by_name:
 *
 * Returns a function pointer which can be used to raise 
 * corlib exceptions. The returned function has the following 
 * signature: void (*func) (char *exc_name, gpointer ip); 
 */
gpointer 
mono_arch_get_throw_exception_by_name (void)
{
	static guint32 *start;
	static int inited = 0;
	guint32 *code;
	int reg;

	if (inited)
		return start;

	inited = 1;
	code = start = mono_global_codeman_reserve (64 * sizeof (guint32));

#ifdef SPARCV9
	reg = sparc_g4;
#else
	reg = sparc_g1;
#endif

	sparc_save_imm (code, sparc_sp, -160, sparc_sp);

	sparc_mov_reg_reg (code, sparc_i0, sparc_o2);
	sparc_set (code, mono_defaults.corlib, sparc_o0);
	sparc_set (code, "System", sparc_o1);
	sparc_set (code, mono_exception_from_name, sparc_o7);
	sparc_jmpl (code, sparc_o7, sparc_g0, sparc_callsite);
	sparc_nop (code);

	/* Return to the caller, so exception handling does not see this frame */
	sparc_restore (code, sparc_o0, sparc_g0, sparc_o0);

	/* Put original return address into %o7 */
	sparc_mov_reg_reg (code, sparc_o1, sparc_o7);
	sparc_set (code, mono_arch_get_throw_exception (), reg);
	/* Use a jmp instead of a call so o7 is preserved */
	sparc_jmpl_imm (code, reg, 0, sparc_g0);
	sparc_nop (code);

	g_assert ((code - start) < 32);

	mono_arch_flush_icache ((guint8*)start, (guint8*)code - (guint8*)start);

	return start;
}
Exemplo n.º 4
0
static gpointer 
get_throw_exception (gboolean rethrow)
{
	guint32 *start, *code;

	code = start = mono_global_codeman_reserve (16 * sizeof (guint32));

	sparc_save_imm (code, sparc_sp, -512, sparc_sp);

	sparc_flushw (code);
	sparc_mov_reg_reg (code, sparc_i0, sparc_o0);
	sparc_mov_reg_reg (code, sparc_fp, sparc_o1);
	sparc_mov_reg_reg (code, sparc_i7, sparc_o2);
	sparc_set (code, rethrow, sparc_o3);
	sparc_set (code, throw_exception, sparc_o7);
	sparc_jmpl (code, sparc_o7, sparc_g0, sparc_callsite);
	sparc_nop (code);

	g_assert ((code - start) <= 16);

	mono_arch_flush_icache ((guint8*)start, (guint8*)code - (guint8*)start);

	return start;
}
Exemplo n.º 5
0
/*
 * mono_arch_get_call_filter:
 *
 * Returns a pointer to a method which calls an exception filter. We
 * also use this function to call finally handlers (we pass NULL as 
 * @exc object in this case).
 *
 * call_filter (MonoContext *ctx, gpointer ip)
 */
gpointer
mono_arch_get_call_filter (MonoTrampInfo **info, gboolean aot)
{
	static guint32 *start;
	static int inited = 0;
	guint32 *code;
	int i;

	g_assert (!aot);
	if (info)
		*info = NULL;

	if (inited)
		return start;

	code = start = mono_global_codeman_reserve (64 * sizeof (guint32));

	/*
	 * There are two frames here:
	 * - the first frame is used by call_filter
	 * - the second frame is used to run the filter code
	 */

	/* Create first frame */
	sparc_save_imm (code, sparc_sp, -256, sparc_sp);

	sparc_mov_reg_reg (code, sparc_i1, sparc_o0);
	sparc_ldi_imm (code, sparc_i0, G_STRUCT_OFFSET (MonoContext, sp), sparc_o1);

	/* Create second frame */
	sparc_save_imm (code, sparc_sp, -256, sparc_sp);

	sparc_mov_reg_reg (code, sparc_i0, sparc_o0);
	sparc_mov_reg_reg (code, sparc_i1, sparc_o1);

	/*
	 * We need to change %fp to point to the stack frame of the method
	 * containing the filter. But changing %fp also changes the %sp of
	 * the parent frame (the first frame), so if the OS saves the first frame,
	 * it saves it to the stack frame of the method, which is not good.
	 * So flush all register windows to memory before changing %fp.
	 */
	sparc_flushw (code);

	sparc_mov_reg_reg (code, sparc_fp, sparc_o7);

	/* 
	 * Modify the second frame so it is identical to the one used in the
	 * method containing the filter.
	 */
	for (i = 0; i < 16; ++i)
		sparc_ldi_imm (code, sparc_o1, MONO_SPARC_STACK_BIAS + i * sizeof (gpointer), sparc_l0 + i);

	/* Save %fp to a location reserved in mono_arch_allocate_vars */
	sparc_sti_imm (code, sparc_o7, sparc_fp, MONO_SPARC_STACK_BIAS - sizeof (gpointer));

	/* Call the filter code, after this returns, %o0 will hold the result */
	sparc_call_imm (code, sparc_o0, 0);
	sparc_nop (code);

	/* Restore original %fp */
	sparc_ldi_imm (code, sparc_fp, MONO_SPARC_STACK_BIAS - sizeof (gpointer), sparc_fp);

	sparc_mov_reg_reg (code, sparc_o0, sparc_i0);

	/* Return to first frame */
	sparc_restore (code, sparc_g0, sparc_g0, sparc_g0);

	/* FIXME: Save locals to the stack */

	/* Return to caller */
	sparc_ret (code);
	/* Return result in delay slot */
	sparc_restore (code, sparc_o0, sparc_g0, sparc_o0);

	g_assert ((code - start) < 64);

	mono_arch_flush_icache ((guint8*)start, (guint8*)code - (guint8*)start);

	inited = 1;

	return start;
}
Exemplo n.º 6
0
guchar*
mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
{
	guint8 *buf, *code, *tramp_addr;
	guint32 lmf_offset, regs_offset, method_reg, i;
	gboolean has_caller;

	g_assert (!aot);
	*info = NULL;

	if (tramp_type == MONO_TRAMPOLINE_JUMP)
		has_caller = FALSE;
	else
		has_caller = TRUE;

	code = buf = mono_global_codeman_reserve (1024);

	sparc_save_imm (code, sparc_sp, -1608, sparc_sp);

#ifdef SPARCV9
	method_reg = sparc_g4;
#else
	method_reg = sparc_g1;
#endif

	regs_offset = MONO_SPARC_STACK_BIAS + 1000;

	/* Save r1 needed by the IMT code */
	sparc_sti_imm (code, sparc_g1, sparc_sp, regs_offset + (sparc_g1 * sizeof (gpointer)));

	/* 
	 * sparc_g5 contains the return address, the trampoline argument is stored in the
	 * instruction stream after the call.
	 */
	sparc_ld_imm (code, sparc_g5, 8, method_reg);

#ifdef SPARCV9
	/* Save fp regs since they are not preserved by calls */
	for (i = 0; i < 16; i ++)
		sparc_stdf_imm (code, sparc_f0 + (i * 2), sparc_sp, MONO_SPARC_STACK_BIAS + 320 + (i * 8));
#endif	

	/* We receive the method address in %r1, so save it here */
	sparc_sti_imm (code, method_reg, sparc_sp, MONO_SPARC_STACK_BIAS + 200);

	/* Save lmf since compilation can raise exceptions */
	lmf_offset = MONO_SPARC_STACK_BIAS - sizeof (MonoLMF);

	/* Save the data for the parent (managed) frame */

	/* Save ip */
	sparc_sti_imm (code, sparc_i7, sparc_fp, lmf_offset + G_STRUCT_OFFSET (MonoLMF, ip));
	/* Save sp */
	sparc_sti_imm (code, sparc_fp, sparc_fp, lmf_offset + G_STRUCT_OFFSET (MonoLMF, sp));
	/* Save fp */
	/* Load previous fp from the saved register window */
	sparc_flushw (code);
	sparc_ldi_imm (code, sparc_fp, MONO_SPARC_STACK_BIAS + (sparc_i6 - 16) * sizeof (gpointer), sparc_o7);
	sparc_sti_imm (code, sparc_o7, sparc_fp, lmf_offset + G_STRUCT_OFFSET (MonoLMF, ebp));
	/* Save method */
	sparc_sti_imm (code, method_reg, sparc_fp, lmf_offset + G_STRUCT_OFFSET (MonoLMF, method));

	sparc_set (code, mono_get_lmf_addr, sparc_o7);
	sparc_jmpl (code, sparc_o7, sparc_g0, sparc_o7);
	sparc_nop (code);

	code = mono_sparc_emit_save_lmf (code, lmf_offset);

	if (has_caller) {
		/* Load all registers of the caller into a table inside this frame */
		/* first the out registers */
		for (i = 0; i < 8; ++i)
			sparc_sti_imm (code, sparc_i0 + i, sparc_sp, regs_offset + ((sparc_o0 + i) * sizeof (gpointer)));
		/* then the in+local registers */
		for (i = 0; i < 16; i ++) {
			sparc_ldi_imm (code, sparc_fp, MONO_SPARC_STACK_BIAS + (i * sizeof (gpointer)), sparc_o7);
			sparc_sti_imm (code, sparc_o7, sparc_sp, regs_offset + ((sparc_l0 + i) * sizeof (gpointer)));
		}
	}

	tramp_addr = mono_get_trampoline_func (tramp_type);
	sparc_ldi_imm (code, sparc_sp, MONO_SPARC_STACK_BIAS + 200, sparc_o2);
	/* pass address of register table as third argument */
	sparc_add_imm (code, FALSE, sparc_sp, regs_offset, sparc_o0);
	sparc_set (code, tramp_addr, sparc_o7);
	/* set %o1 to caller address */
	if (has_caller)
		sparc_mov_reg_reg (code, sparc_i7, sparc_o1);
	else
		sparc_set (code, 0, sparc_o1);
	sparc_set (code, 0, sparc_o3);
	sparc_jmpl (code, sparc_o7, sparc_g0, sparc_o7);
	sparc_nop (code);

	/* Save result */
	sparc_sti_imm (code, sparc_o0, sparc_sp, MONO_SPARC_STACK_BIAS + 304);

	/* Check for thread interruption */
	sparc_set (code, (guint8*)mono_thread_force_interruption_checkpoint, sparc_o7);
	sparc_jmpl (code, sparc_o7, sparc_g0, sparc_o7);
	sparc_nop (code);

	/* Restore lmf */
	code = mono_sparc_emit_restore_lmf (code, lmf_offset);

	/* Reload result */
	sparc_ldi_imm (code, sparc_sp, MONO_SPARC_STACK_BIAS + 304, sparc_o0);

#ifdef SPARCV9
	/* Reload fp regs */
	for (i = 0; i < 16; i ++)
		sparc_lddf_imm (code, sparc_sp, MONO_SPARC_STACK_BIAS + 320 + (i * 8), sparc_f0 + (i * 2));
#endif	

	sparc_jmpl (code, sparc_o0, sparc_g0, sparc_g0);

	/* restore previous frame in delay slot */
	sparc_restore_simple (code);

/*
{
	gpointer addr;

	sparc_save_imm (code, sparc_sp, -608, sparc_sp);
	addr = code;
	sparc_call_simple (code, 16);
	sparc_nop (code);
	sparc_rett_simple (code);
	sparc_nop (code);

	sparc_save_imm (code, sparc_sp, -608, sparc_sp);
	sparc_ta (code, 1);
	tramp_addr = &sparc_magic_trampoline;
	sparc_call_simple (code, tramp_addr - code);
	sparc_nop (code);
	sparc_rett_simple (code);
	sparc_nop (code);
}
*/

	g_assert ((code - buf) <= 512);

	mono_arch_flush_icache (buf, code - buf);

	return buf;
}