2 * exceptions-sparc.c: exception support for sparc
5 * Mark Crichton (crichton@gimp.org)
6 * Dietmar Maurer (dietmar@ximian.com)
8 * (C) 2003 Ximian, Inc.
15 #include <sys/ucontext.h>
17 #include <mono/arch/sparc/sparc-codegen.h>
18 #include <mono/metadata/appdomain.h>
19 #include <mono/metadata/tabledefs.h>
20 #include <mono/metadata/threads.h>
21 #include <mono/metadata/debug-helpers.h>
22 #include <mono/metadata/exception.h>
23 #include <mono/metadata/mono-debug.h>
24 #include <mono/metadata/gc-internals.h>
25 #include <mono/metadata/tokentype.h>
28 #include "mini-sparc.h"
34 #define MONO_SPARC_WINDOW_ADDR(sp) ((gpointer*)(((guint8*)(sp)) + MONO_SPARC_STACK_BIAS))
37 * mono_arch_get_restore_context:
39 * Returns a pointer to a method which restores a previously saved sigcontext.
42 mono_arch_get_restore_context (MonoTrampInfo **info, gboolean aot)
44 static guint32 *start;
45 static int inited = 0;
55 code = start = mono_global_codeman_reserve (32 * sizeof (guint32));
57 sparc_ldi_imm (code, sparc_o0, G_STRUCT_OFFSET (MonoContext, ip), sparc_i7);
58 sparc_ldi_imm (code, sparc_o0, G_STRUCT_OFFSET (MonoContext, sp), sparc_i6);
60 sparc_jmpl_imm (code, sparc_i7, 0, sparc_g0);
61 /* FIXME: This does not return to the correct window */
62 sparc_restore_imm (code, sparc_g0, 0, sparc_g0);
64 g_assert ((code - start) < 32);
66 mono_arch_flush_icache ((guint8*)start, (guint8*)code - (guint8*)start);
74 * mono_arch_get_call_filter:
76 * Returns a pointer to a method which calls an exception filter. We
77 * also use this function to call finally handlers (we pass NULL as
78 * @exc object in this case).
80 * call_filter (MonoContext *ctx, gpointer ip)
83 mono_arch_get_call_filter (MonoTrampInfo **info, gboolean aot)
85 static guint32 *start;
86 static int inited = 0;
97 code = start = mono_global_codeman_reserve (64 * sizeof (guint32));
100 * There are two frames here:
101 * - the first frame is used by call_filter
102 * - the second frame is used to run the filter code
105 /* Create first frame */
106 sparc_save_imm (code, sparc_sp, -256, sparc_sp);
108 sparc_mov_reg_reg (code, sparc_i1, sparc_o0);
109 sparc_ldi_imm (code, sparc_i0, G_STRUCT_OFFSET (MonoContext, sp), sparc_o1);
111 /* Create second frame */
112 sparc_save_imm (code, sparc_sp, -256, sparc_sp);
114 sparc_mov_reg_reg (code, sparc_i0, sparc_o0);
115 sparc_mov_reg_reg (code, sparc_i1, sparc_o1);
118 * We need to change %fp to point to the stack frame of the method
119 * containing the filter. But changing %fp also changes the %sp of
120 * the parent frame (the first frame), so if the OS saves the first frame,
121 * it saves it to the stack frame of the method, which is not good.
122 * So flush all register windows to memory before changing %fp.
126 sparc_mov_reg_reg (code, sparc_fp, sparc_o7);
129 * Modify the second frame so it is identical to the one used in the
130 * method containing the filter.
132 for (i = 0; i < 16; ++i)
133 sparc_ldi_imm (code, sparc_o1, MONO_SPARC_STACK_BIAS + i * sizeof (gpointer), sparc_l0 + i);
135 /* Save %fp to a location reserved in mono_arch_allocate_vars */
136 sparc_sti_imm (code, sparc_o7, sparc_fp, MONO_SPARC_STACK_BIAS - sizeof (gpointer));
138 /* Call the filter code, after this returns, %o0 will hold the result */
139 sparc_call_imm (code, sparc_o0, 0);
142 /* Restore original %fp */
143 sparc_ldi_imm (code, sparc_fp, MONO_SPARC_STACK_BIAS - sizeof (gpointer), sparc_fp);
145 sparc_mov_reg_reg (code, sparc_o0, sparc_i0);
147 /* Return to first frame */
148 sparc_restore (code, sparc_g0, sparc_g0, sparc_g0);
150 /* FIXME: Save locals to the stack */
152 /* Return to caller */
154 /* Return result in delay slot */
155 sparc_restore (code, sparc_o0, sparc_g0, sparc_o0);
157 g_assert ((code - start) < 64);
159 mono_arch_flush_icache ((guint8*)start, (guint8*)code - (guint8*)start);
167 throw_exception (MonoObject *exc, gpointer sp, gpointer ip, gboolean rethrow)
171 static void (*restore_context) (MonoContext *);
174 if (!restore_context)
175 restore_context = mono_get_restore_context ();
177 window = MONO_SPARC_WINDOW_ADDR (sp);
178 ctx.sp = (gpointer*)sp;
180 ctx.fp = (gpointer*)(MONO_SPARC_WINDOW_ADDR (sp) [sparc_i6 - 16]);
182 if (mono_object_isinst_checked (exc, mono_defaults.exception_class, &error)) {
183 MonoException *mono_ex = (MonoException*)exc;
185 mono_ex->stack_trace = NULL;
186 mono_ex->trace_ips = NULL;
189 mono_error_assert_ok (&error);
190 mono_handle_exception (&ctx, exc);
191 restore_context (&ctx);
193 g_assert_not_reached ();
197 get_throw_exception (gboolean rethrow)
199 guint32 *start, *code;
201 code = start = mono_global_codeman_reserve (16 * sizeof (guint32));
203 sparc_save_imm (code, sparc_sp, -512, sparc_sp);
206 sparc_mov_reg_reg (code, sparc_i0, sparc_o0);
207 sparc_mov_reg_reg (code, sparc_fp, sparc_o1);
208 sparc_mov_reg_reg (code, sparc_i7, sparc_o2);
209 sparc_set (code, rethrow, sparc_o3);
210 sparc_set (code, throw_exception, sparc_o7);
211 sparc_jmpl (code, sparc_o7, sparc_g0, sparc_callsite);
214 g_assert ((code - start) <= 16);
216 mono_arch_flush_icache ((guint8*)start, (guint8*)code - (guint8*)start);
222 * mono_arch_get_throw_exception:
224 * Returns a function pointer which can be used to raise exceptions.
225 * The returned function has the following
226 * signature: void (*func) (MonoException *exc);
229 mono_arch_get_throw_exception (MonoTrampInfo **info, gboolean aot)
231 static guint32* start;
232 static int inited = 0;
243 start = get_throw_exception (FALSE);
249 mono_arch_get_rethrow_exception (MonoTrampInfo **info, gboolean aot)
251 static guint32* start;
252 static int inited = 0;
263 start = get_throw_exception (TRUE);
269 * mono_arch_get_throw_corlib_exception:
271 * Returns a function pointer which can be used to raise
272 * corlib exceptions. The returned function has the following
273 * signature: void (*func) (guint32 ex_token, guint32 offset);
274 * Here, offset is the offset which needs to be substracted from the caller IP
275 * to get the IP of the throw. Passing the offset has the advantage that it
276 * needs no relocations in the caller.
279 mono_arch_get_throw_corlib_exception (MonoTrampInfo **info, gboolean aot)
281 static guint32 *start;
282 static int inited = 0;
294 code = start = mono_global_codeman_reserve (64 * sizeof (guint32));
302 sparc_mov_reg_reg (code, sparc_o7, sparc_o2);
303 sparc_save_imm (code, sparc_sp, -160, sparc_sp);
305 sparc_set (code, MONO_TOKEN_TYPE_DEF, sparc_o7);
306 sparc_add (code, FALSE, sparc_i0, sparc_o7, sparc_o1);
307 sparc_set (code, mono_defaults.exception_class->image, sparc_o0);
308 sparc_set (code, mono_exception_from_token, sparc_o7);
309 sparc_jmpl (code, sparc_o7, sparc_g0, sparc_callsite);
312 /* Return to the caller, so exception handling does not see this frame */
313 sparc_restore (code, sparc_o0, sparc_g0, sparc_o0);
315 /* Compute throw ip */
316 sparc_sll_imm (code, sparc_o1, 2, sparc_o1);
317 sparc_sub (code, 0, sparc_o2, sparc_o1, sparc_o7);
319 sparc_set (code, mono_arch_get_throw_exception (NULL, FALSE), reg);
320 /* Use a jmp instead of a call so o7 is preserved */
321 sparc_jmpl_imm (code, reg, 0, sparc_g0);
324 g_assert ((code - start) < 32);
326 mono_arch_flush_icache ((guint8*)start, (guint8*)code - (guint8*)start);
331 /* mono_arch_unwind_frame:
333 * This function is used to gather information from @ctx. It return the
334 * MonoJitInfo of the corresponding function, unwinds one stack frame and
335 * stores the resulting context into @new_ctx. It also stores a string
336 * describing the stack location into @trace (if not NULL), and modifies
337 * the @lmf if necessary. @native_offset return the IP offset from the
338 * start of the function or -1 if that info is not available.
341 mono_arch_unwind_frame (MonoDomain *domain, MonoJitTlsData *jit_tls,
342 MonoJitInfo *ji, MonoContext *ctx,
343 MonoContext *new_ctx, MonoLMF **lmf,
344 mgreg_t **save_locations,
345 StackFrameInfo *frame)
349 memset (frame, 0, sizeof (StackFrameInfo));
355 if (ji->is_trampoline)
356 frame->type = FRAME_TYPE_TRAMPOLINE;
358 frame->type = FRAME_TYPE_MANAGED;
360 /* Restore ip and sp from the saved register window */
361 window = MONO_SPARC_WINDOW_ADDR (ctx->sp);
362 new_ctx->ip = window [sparc_i7 - 16];
363 new_ctx->sp = (gpointer*)(window [sparc_i6 - 16]);
364 new_ctx->fp = (gpointer*)(MONO_SPARC_WINDOW_ADDR (new_ctx->sp) [sparc_i6 - 16]);
375 ji = mini_jit_info_table_find (domain, (gpointer)(*lmf)->ip, NULL);
380 frame->type = FRAME_TYPE_MANAGED_TO_NATIVE;
382 new_ctx->ip = (*lmf)->ip;
383 new_ctx->sp = (*lmf)->sp;
384 new_ctx->fp = (*lmf)->ebp;
386 *lmf = (*lmf)->previous_lmf;
395 mono_arch_handle_exception (void *sigctx, gpointer obj)
398 struct sigcontext *sc = sigctx;
402 mctx.ip = (gpointer) sc->sigc_regs.tpc;
403 mctx.sp = (gpointer) sc->sigc_regs.u_regs[14];
405 mctx.ip = (gpointer) sc->si_regs.pc;
406 mctx.sp = (gpointer) sc->si_regs.u_regs[14];
409 window = (gpointer*)(((guint8*)mctx.sp) + MONO_SPARC_STACK_BIAS);
410 mctx.fp = window [sparc_fp - 16];
412 mono_handle_exception (&mctx, obj);
415 sc->sigc_regs.tpc = (unsigned long) mctx.ip;
416 sc->sigc_regs.tnpc = (unsigned long) (mctx.ip + 4);
417 sc->sigc_regs.u_regs[14] = (unsigned long) mctx.sp;
419 sc->si_regs.pc = (unsigned long) mctx.ip;
420 sc->si_regs.npc = (unsigned long) (mctx.ip + 4);
421 sc->si_regs.u_regs[14] = (unsigned long) mctx.sp;
424 window = (gpointer*)(((guint8*)mctx.sp) + MONO_SPARC_STACK_BIAS);
425 window [sparc_fp - 16] = mctx.fp;
431 mono_arch_ip_from_context (void *sigctx)
433 struct sigcontext *sc = sigctx;
437 ret = (gpointer) sc->sigc_regs.tpc;
439 ret = (gpointer) sc->si_regs.pc;
445 #else /* !__linux__ */
448 mono_arch_handle_exception (void *sigctx, gpointer obj)
451 ucontext_t *ctx = (ucontext_t*)sigctx;
455 * Access to the machine state using the ucontext_t parameter is somewhat
456 * under documented under solaris. The code below seems to work under
459 g_assert (!ctx->uc_mcontext.gwins);
461 mctx.ip = ctx->uc_mcontext.gregs [REG_PC];
462 mctx.sp = ctx->uc_mcontext.gregs [REG_SP];
463 window = (gpointer*)(((guint8*)mctx.sp) + MONO_SPARC_STACK_BIAS);
464 mctx.fp = window [sparc_fp - 16];
466 mono_handle_exception (&mctx, obj);
468 /* We can't use restore_context to return from a signal handler */
469 ctx->uc_mcontext.gregs [REG_PC] = mctx.ip;
470 ctx->uc_mcontext.gregs [REG_nPC] = mctx.ip + 4;
471 ctx->uc_mcontext.gregs [REG_SP] = mctx.sp;
472 window = (gpointer*)(((guint8*)mctx.sp) + MONO_SPARC_STACK_BIAS);
473 window [sparc_fp - 16] = mctx.fp;
479 mono_arch_ip_from_context (void *sigctx)
481 ucontext_t *ctx = (ucontext_t*)sigctx;
482 return (gpointer)ctx->uc_mcontext.gregs [REG_PC];