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;
}
/*
* 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;
}
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;
}