mono/mini/tramp-sparc.c

   1 /*
   2  * tramp-sparc.c: JIT trampoline code for Sparc
   3  *
   4  * Authors:
   5  *   Mark Crichton (crichton@gimp.org)
   6  *   Dietmar Maurer (dietmar@ximian.com)
   7  *
   8  * (C) 2003 Ximian, Inc.
   9  */
  10
  11 #include <config.h>
  12 #include <glib.h>
  13
  14 #include <mono/arch/sparc/sparc-codegen.h>
  15 #include <mono/metadata/appdomain.h>
  16 #include <mono/metadata/marshal.h>
  17 #include <mono/metadata/tabledefs.h>
  18
  19 #include "mini.h"
  20 #include "mini-sparc.h"
  21
  22 /*
  23  * mono_arch_get_unbox_trampoline:
  24  * @gsctx: the generic sharing context
  25  * @m: method pointer
  26  * @addr: pointer to native code for @m
  27  *
  28  * when value type methods are called through the vtable we need to unbox the
  29  * this argument. This method returns a pointer to a trampoline which does
  30  * unboxing before calling the method
  31  */
  32 gpointer
  33 mono_arch_get_unbox_trampoline (MonoGenericSharingContext *gsctx, MonoMethod *m, gpointer addr)
  34 {
  35         guint8 *code, *start;
  36         int this_pos = 4, reg;
  37
  38         if (MONO_TYPE_ISSTRUCT (mono_method_signature (m)->ret))
  39                 this_pos = 8;
  40
  41         start = code = mono_global_codeman_reserve (36);
  42
  43         /* This executes in the context of the caller, hence o0 */
  44         sparc_add_imm (code, 0, sparc_o0, sizeof (MonoObject), sparc_o0);
  45 #ifdef SPARCV9
  46         reg = sparc_g4;
  47 #else
  48         reg = sparc_g1;
  49 #endif
  50         sparc_set (code, addr, reg);
  51         sparc_jmpl (code, reg, sparc_g0, sparc_g0);
  52         sparc_nop (code);
  53
  54         g_assert ((code - start) <= 36);
  55
  56         mono_arch_flush_icache (start, code - start);
  57
  58         return start;
  59 }
  60
  61 void
  62 mono_arch_patch_callsite (guint8 *method_start, guint8 *code, guint8 *addr)
  63 {
  64         if (sparc_inst_op (*(guint32*)code) == 0x1) {
  65                 sparc_call_simple (code, (guint8*)addr - (guint8*)code);
  66         }
  67 }
  68
  69 void
  70 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
  71 {
  72         g_assert_not_reached ();
  73 }
  74
  75 void
  76 mono_arch_nullify_class_init_trampoline (guint8 *code, mgreg_t *regs)
  77 {
  78         /* Patch calling code */
  79         sparc_nop (code);
  80 }
  81
  82 void
  83 mono_arch_nullify_plt_entry (guint8 *code, mgreg_t *regs)
  84 {
  85         g_assert_not_reached ();
  86 }
  87
  88 #define ALIGN_TO(val,align) (((val) + ((align) - 1)) & ~((align) - 1))
  89
  90 guchar*
  91 mono_arch_create_trampoline_code (MonoTrampolineType tramp_type)
  92 {
  93         guint8 *buf, *code, *tramp_addr;
  94         guint32 lmf_offset, regs_offset, method_reg, i;
  95         gboolean has_caller;
  96
  97         if (tramp_type == MONO_TRAMPOLINE_JUMP)
  98                 has_caller = FALSE;
  99         else
 100                 has_caller = TRUE;
 101
 102         code = buf = mono_global_codeman_reserve (1024);
 103
 104         sparc_save_imm (code, sparc_sp, -1608, sparc_sp);
 105
 106 #ifdef SPARCV9
 107         method_reg = sparc_g4;
 108 #else
 109         method_reg = sparc_g1;
 110 #endif
 111
 112         regs_offset = MONO_SPARC_STACK_BIAS + 1000;
 113
 114         /* Save r1 needed by the IMT code */
 115         sparc_sti_imm (code, sparc_g1, sparc_sp, regs_offset + (sparc_g1 * sizeof (gpointer)));
 116
 117         /*
 118          * sparc_g5 contains the return address, the trampoline argument is stored in the
 119          * instruction stream after the call.
 120          */
 121         sparc_ld_imm (code, sparc_g5, 8, method_reg);
 122
 123 #ifdef SPARCV9
 124         /* Save fp regs since they are not preserved by calls */
 125         for (i = 0; i < 16; i ++)
 126                 sparc_stdf_imm (code, sparc_f0 + (i * 2), sparc_sp, MONO_SPARC_STACK_BIAS + 320 + (i * 8));
 127 #endif
 128
 129         /* We receive the method address in %r1, so save it here */
 130         sparc_sti_imm (code, method_reg, sparc_sp, MONO_SPARC_STACK_BIAS + 200);
 131
 132         /* Save lmf since compilation can raise exceptions */
 133         lmf_offset = MONO_SPARC_STACK_BIAS - sizeof (MonoLMF);
 134
 135         /* Save the data for the parent (managed) frame */
 136
 137         /* Save ip */
 138         sparc_sti_imm (code, sparc_i7, sparc_fp, lmf_offset + G_STRUCT_OFFSET (MonoLMF, ip));
 139         /* Save sp */
 140         sparc_sti_imm (code, sparc_fp, sparc_fp, lmf_offset + G_STRUCT_OFFSET (MonoLMF, sp));
 141         /* Save fp */
 142         /* Load previous fp from the saved register window */
 143         sparc_flushw (code);
 144         sparc_ldi_imm (code, sparc_fp, MONO_SPARC_STACK_BIAS + (sparc_i6 - 16) * sizeof (gpointer), sparc_o7);
 145         sparc_sti_imm (code, sparc_o7, sparc_fp, lmf_offset + G_STRUCT_OFFSET (MonoLMF, ebp));
 146         /* Save method */
 147         sparc_sti_imm (code, method_reg, sparc_fp, lmf_offset + G_STRUCT_OFFSET (MonoLMF, method));
 148
 149         sparc_set (code, mono_get_lmf_addr, sparc_o7);
 150         sparc_jmpl (code, sparc_o7, sparc_g0, sparc_o7);
 151         sparc_nop (code);
 152
 153         code = mono_sparc_emit_save_lmf (code, lmf_offset);
 154
 155         if (has_caller) {
 156                 /* Load all registers of the caller into a table inside this frame */
 157                 /* first the out registers */
 158                 for (i = 0; i < 8; ++i)
 159                         sparc_sti_imm (code, sparc_i0 + i, sparc_sp, regs_offset + ((sparc_o0 + i) * sizeof (gpointer)));
 160                 /* then the in+local registers */
 161                 for (i = 0; i < 16; i ++) {
 162                         sparc_ldi_imm (code, sparc_fp, MONO_SPARC_STACK_BIAS + (i * sizeof (gpointer)), sparc_o7);
 163                         sparc_sti_imm (code, sparc_o7, sparc_sp, regs_offset + ((sparc_l0 + i) * sizeof (gpointer)));
 164                 }
 165         }
 166
 167         tramp_addr = mono_get_trampoline_func (tramp_type);
 168         sparc_ldi_imm (code, sparc_sp, MONO_SPARC_STACK_BIAS + 200, sparc_o2);
 169         /* pass address of register table as third argument */
 170         sparc_add_imm (code, FALSE, sparc_sp, regs_offset, sparc_o0);
 171         sparc_set (code, tramp_addr, sparc_o7);
 172         /* set %o1 to caller address */
 173         if (has_caller)
 174                 sparc_mov_reg_reg (code, sparc_i7, sparc_o1);
 175         else
 176                 sparc_set (code, 0, sparc_o1);
 177         sparc_set (code, 0, sparc_o3);
 178         sparc_jmpl (code, sparc_o7, sparc_g0, sparc_o7);
 179         sparc_nop (code);
 180
 181         /* Save result */
 182         sparc_sti_imm (code, sparc_o0, sparc_sp, MONO_SPARC_STACK_BIAS + 304);
 183
 184         /* Check for thread interruption */
 185         sparc_set (code, (guint8*)mono_thread_force_interruption_checkpoint, sparc_o7);
 186         sparc_jmpl (code, sparc_o7, sparc_g0, sparc_o7);
 187         sparc_nop (code);
 188
 189         /* Restore lmf */
 190         code = mono_sparc_emit_restore_lmf (code, lmf_offset);
 191
 192         /* Reload result */
 193         sparc_ldi_imm (code, sparc_sp, MONO_SPARC_STACK_BIAS + 304, sparc_o0);
 194
 195 #ifdef SPARCV9
 196         /* Reload fp regs */
 197         for (i = 0; i < 16; i ++)
 198                 sparc_lddf_imm (code, sparc_sp, MONO_SPARC_STACK_BIAS + 320 + (i * 8), sparc_f0 + (i * 2));
 199 #endif
 200
 201         if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT)
 202                 sparc_ret (code);
 203         else
 204                 sparc_jmpl (code, sparc_o0, sparc_g0, sparc_g0);
 205
 206         /* restore previous frame in delay slot */
 207         sparc_restore_simple (code);
 208
 209 /*
 210 {
 211         gpointer addr;
 212
 213         sparc_save_imm (code, sparc_sp, -608, sparc_sp);
 214         addr = code;
 215         sparc_call_simple (code, 16);
 216         sparc_nop (code);
 217         sparc_rett_simple (code);
 218         sparc_nop (code);
 219
 220         sparc_save_imm (code, sparc_sp, -608, sparc_sp);
 221         sparc_ta (code, 1);
 222         tramp_addr = &sparc_magic_trampoline;
 223         sparc_call_simple (code, tramp_addr - code);
 224         sparc_nop (code);
 225         sparc_rett_simple (code);
 226         sparc_nop (code);
 227 }
 228 */
 229
 230         g_assert ((code - buf) <= 512);
 231
 232         mono_arch_flush_icache (buf, code - buf);
 233
 234         return buf;
 235 }
 236
 237 #define TRAMPOLINE_SIZE (SPARC_SET_MAX_SIZE + 3)
 238
 239 gpointer
 240 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
 241 {
 242         guint32 *code, *buf, *tramp;
 243
 244         tramp = mono_get_trampoline_code (tramp_type);
 245
 246         code = buf = mono_domain_code_reserve (domain, TRAMPOLINE_SIZE * 4);
 247
 248         /* We have to use g5 here because there is no other free register */
 249         sparc_set (code, tramp, sparc_g5);
 250         sparc_jmpl (code, sparc_g5, sparc_g0, sparc_g5);
 251         sparc_nop (code);
 252 #ifdef SPARCV9
 253         g_assert_not_reached ();
 254 #else
 255         *code = (guint32)arg1;
 256         code ++;
 257 #endif
 258
 259         g_assert ((code - buf) <= TRAMPOLINE_SIZE);
 260
 261         if (code_len)
 262                 *code_len = (code - buf) * 4;
 263
 264         mono_jit_stats.method_trampolines++;
 265
 266         mono_arch_flush_icache ((guint8*)buf, (code - buf) * 4);
 267
 268         return buf;
 269 }
 270
 271 gpointer
 272 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 encoded_offset)
 273 {
 274         /* FIXME: implement! */
 275         g_assert_not_reached ();
 276         return NULL;
 277 }