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-internal.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 (void)
44 static guint32 *start;
45 static int inited = 0;
51 code = start = mono_global_codeman_reserve (32 * sizeof (guint32));
53 sparc_ldi_imm (code, sparc_o0, G_STRUCT_OFFSET (MonoContext, ip), sparc_i7);
54 sparc_ldi_imm (code, sparc_o0, G_STRUCT_OFFSET (MonoContext, sp), sparc_i6);
56 sparc_jmpl_imm (code, sparc_i7, 0, sparc_g0);
57 /* FIXME: This does not return to the correct window */
58 sparc_restore_imm (code, sparc_g0, 0, sparc_g0);
60 g_assert ((code - start) < 32);
62 mono_arch_flush_icache ((guint8*)start, (guint8*)code - (guint8*)start);
70 * mono_arch_get_call_filter:
72 * Returns a pointer to a method which calls an exception filter. We
73 * also use this function to call finally handlers (we pass NULL as
74 * @exc object in this case).
76 * call_filter (MonoContext *ctx, gpointer ip)
79 mono_arch_get_call_filter (void)
81 static guint32 *start;
82 static int inited = 0;
89 code = start = mono_global_codeman_reserve (64 * sizeof (guint32));
92 * There are two frames here:
93 * - the first frame is used by call_filter
94 * - the second frame is used to run the filter code
97 /* Create first frame */
98 sparc_save_imm (code, sparc_sp, -256, sparc_sp);
100 sparc_mov_reg_reg (code, sparc_i1, sparc_o0);
101 sparc_ldi_imm (code, sparc_i0, G_STRUCT_OFFSET (MonoContext, sp), sparc_o1);
103 /* Create second frame */
104 sparc_save_imm (code, sparc_sp, -256, sparc_sp);
106 sparc_mov_reg_reg (code, sparc_i0, sparc_o0);
107 sparc_mov_reg_reg (code, sparc_i1, sparc_o1);
110 * We need to change %fp to point to the stack frame of the method
111 * containing the filter. But changing %fp also changes the %sp of
112 * the parent frame (the first frame), so if the OS saves the first frame,
113 * it saves it to the stack frame of the method, which is not good.
114 * So flush all register windows to memory before changing %fp.
118 sparc_mov_reg_reg (code, sparc_fp, sparc_o7);
121 * Modify the second frame so it is identical to the one used in the
122 * method containing the filter.
124 for (i = 0; i < 16; ++i)
125 sparc_ldi_imm (code, sparc_o1, MONO_SPARC_STACK_BIAS + i * sizeof (gpointer), sparc_l0 + i);
127 /* Save %fp to a location reserved in mono_arch_allocate_vars */
128 sparc_sti_imm (code, sparc_o7, sparc_fp, MONO_SPARC_STACK_BIAS - sizeof (gpointer));
130 /* Call the filter code, after this returns, %o0 will hold the result */
131 sparc_call_imm (code, sparc_o0, 0);
134 /* Restore original %fp */
135 sparc_ldi_imm (code, sparc_fp, MONO_SPARC_STACK_BIAS - sizeof (gpointer), sparc_fp);
137 sparc_mov_reg_reg (code, sparc_o0, sparc_i0);
139 /* Return to first frame */
140 sparc_restore (code, sparc_g0, sparc_g0, sparc_g0);
142 /* FIXME: Save locals to the stack */
144 /* Return to caller */
146 /* Return result in delay slot */
147 sparc_restore (code, sparc_o0, sparc_g0, sparc_o0);
149 g_assert ((code - start) < 64);
151 mono_arch_flush_icache ((guint8*)start, (guint8*)code - (guint8*)start);
159 throw_exception (MonoObject *exc, gpointer sp, gpointer ip, gboolean rethrow)
162 static void (*restore_context) (MonoContext *);
165 if (!restore_context)
166 restore_context = mono_arch_get_restore_context ();
168 window = MONO_SPARC_WINDOW_ADDR (sp);
169 ctx.sp = (gpointer*)sp;
171 ctx.fp = (gpointer*)(MONO_SPARC_WINDOW_ADDR (sp) [sparc_i6 - 16]);
173 if (mono_object_isinst (exc, mono_defaults.exception_class)) {
174 MonoException *mono_ex = (MonoException*)exc;
176 mono_ex->stack_trace = NULL;
178 mono_handle_exception (&ctx, exc, ip, FALSE);
179 restore_context (&ctx);
181 g_assert_not_reached ();
185 get_throw_exception (gboolean rethrow)
187 guint32 *start, *code;
189 code = start = mono_global_codeman_reserve (16 * sizeof (guint32));
191 sparc_save_imm (code, sparc_sp, -512, sparc_sp);
194 sparc_mov_reg_reg (code, sparc_i0, sparc_o0);
195 sparc_mov_reg_reg (code, sparc_fp, sparc_o1);
196 sparc_mov_reg_reg (code, sparc_i7, sparc_o2);
197 sparc_set (code, rethrow, sparc_o3);
198 sparc_set (code, throw_exception, sparc_o7);
199 sparc_jmpl (code, sparc_o7, sparc_g0, sparc_callsite);
202 g_assert ((code - start) <= 16);
204 mono_arch_flush_icache ((guint8*)start, (guint8*)code - (guint8*)start);
210 * mono_arch_get_throw_exception:
212 * Returns a function pointer which can be used to raise exceptions.
213 * The returned function has the following
214 * signature: void (*func) (MonoException *exc);
217 mono_arch_get_throw_exception (void)
219 static guint32* start;
220 static int inited = 0;
227 start = get_throw_exception (FALSE);
233 mono_arch_get_rethrow_exception (void)
235 static guint32* start;
236 static int inited = 0;
243 start = get_throw_exception (TRUE);
249 * mono_arch_get_throw_corlib_exception:
251 * Returns a function pointer which can be used to raise
252 * corlib exceptions. The returned function has the following
253 * signature: void (*func) (guint32 ex_token, guint32 offset);
254 * Here, offset is the offset which needs to be substracted from the caller IP
255 * to get the IP of the throw. Passing the offset has the advantage that it
256 * needs no relocations in the caller.
259 mono_arch_get_throw_corlib_exception (void)
261 static guint32 *start;
262 static int inited = 0;
270 code = start = mono_global_codeman_reserve (64 * sizeof (guint32));
278 sparc_mov_reg_reg (code, sparc_o7, sparc_o2);
279 sparc_save_imm (code, sparc_sp, -160, sparc_sp);
281 sparc_set (code, MONO_TOKEN_TYPE_DEF, sparc_o7);
282 sparc_add (code, FALSE, sparc_i0, sparc_o7, sparc_o1);
283 sparc_set (code, mono_defaults.exception_class->image, sparc_o0);
284 sparc_set (code, mono_exception_from_token, sparc_o7);
285 sparc_jmpl (code, sparc_o7, sparc_g0, sparc_callsite);
288 /* Return to the caller, so exception handling does not see this frame */
289 sparc_restore (code, sparc_o0, sparc_g0, sparc_o0);
291 /* Compute throw ip */
292 sparc_sll_imm (code, sparc_o1, 2, sparc_o1);
293 sparc_sub (code, 0, sparc_o2, sparc_o1, sparc_o7);
295 sparc_set (code, mono_arch_get_throw_exception (), reg);
296 /* Use a jmp instead of a call so o7 is preserved */
297 sparc_jmpl_imm (code, reg, 0, sparc_g0);
300 g_assert ((code - start) < 32);
302 mono_arch_flush_icache ((guint8*)start, (guint8*)code - (guint8*)start);
307 /* mono_arch_find_jit_info:
309 * This function is used to gather information from @ctx. It return the
310 * MonoJitInfo of the corresponding function, unwinds one stack frame and
311 * stores the resulting context into @new_ctx. It also stores a string
312 * describing the stack location into @trace (if not NULL), and modifies
313 * the @lmf if necessary. @native_offset return the IP offset from the
314 * start of the function or -1 if that info is not available.
317 mono_arch_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
318 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
321 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
324 /* Avoid costly table lookup during stack overflow */
325 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
328 ji = mini_jit_info_table_find (domain, ip, NULL);
337 if (!ji->method->wrapper_type)
340 if (*lmf && (MONO_CONTEXT_GET_BP (ctx) >= (gpointer)(*lmf)->ebp)) {
341 /* remove any unused lmf */
342 *lmf = (*lmf)->previous_lmf;
345 /* Restore ip and sp from the saved register window */
346 window = MONO_SPARC_WINDOW_ADDR (ctx->sp);
347 new_ctx->ip = window [sparc_i7 - 16];
348 new_ctx->sp = (gpointer*)(window [sparc_i6 - 16]);
349 new_ctx->fp = (gpointer*)(MONO_SPARC_WINDOW_ADDR (new_ctx->sp) [sparc_i6 - 16]);
362 if ((ji = mini_jit_info_table_find (domain, (gpointer)(*lmf)->ip, NULL))) {
364 memset (res, 0, MONO_SIZEOF_JIT_INFO);
365 res->method = (*lmf)->method;
368 new_ctx->ip = (*lmf)->ip;
369 new_ctx->sp = (*lmf)->sp;
370 new_ctx->fp = (*lmf)->ebp;
372 *lmf = (*lmf)->previous_lmf;
374 return ji ? ji : res;
379 mono_arch_has_unwind_info (gconstpointer addr)
387 mono_arch_handle_exception (void *sigctx, gpointer obj, gboolean test_only)
390 struct sigcontext *sc = sigctx;
394 mctx.ip = (gpointer) sc->sigc_regs.tpc;
395 mctx.sp = (gpointer) sc->sigc_regs.u_regs[14];
397 mctx.ip = (gpointer) sc->si_regs.pc;
398 mctx.sp = (gpointer) sc->si_regs.u_regs[14];
401 window = (gpointer*)(((guint8*)mctx.sp) + MONO_SPARC_STACK_BIAS);
402 mctx.fp = window [sparc_fp - 16];
404 mono_handle_exception (&mctx, obj, mctx.ip, test_only);
407 sc->sigc_regs.tpc = (unsigned long) mctx.ip;
408 sc->sigc_regs.tnpc = (unsigned long) (mctx.ip + 4);
409 sc->sigc_regs.u_regs[14] = (unsigned long) mctx.sp;
411 sc->si_regs.pc = (unsigned long) mctx.ip;
412 sc->si_regs.npc = (unsigned long) (mctx.ip + 4);
413 sc->si_regs.u_regs[14] = (unsigned long) mctx.sp;
416 window = (gpointer*)(((guint8*)mctx.sp) + MONO_SPARC_STACK_BIAS);
417 window [sparc_fp - 16] = mctx.fp;
423 mono_arch_ip_from_context (void *sigctx)
425 struct sigcontext *sc = sigctx;
429 ret = (gpointer) sc->sigc_regs.tpc;
431 ret = (gpointer) sc->si_regs.pc;
437 #else /* !__linux__ */
440 mono_arch_handle_exception (void *sigctx, gpointer obj, gboolean test_only)
443 ucontext_t *ctx = (ucontext_t*)sigctx;
447 * Access to the machine state using the ucontext_t parameter is somewhat
448 * under documented under solaris. The code below seems to work under
451 g_assert (!ctx->uc_mcontext.gwins);
453 mctx.ip = ctx->uc_mcontext.gregs [REG_PC];
454 mctx.sp = ctx->uc_mcontext.gregs [REG_SP];
455 window = (gpointer*)(((guint8*)mctx.sp) + MONO_SPARC_STACK_BIAS);
456 mctx.fp = window [sparc_fp - 16];
458 mono_handle_exception (&mctx, obj, mctx.ip, test_only);
460 /* We can't use restore_context to return from a signal handler */
461 ctx->uc_mcontext.gregs [REG_PC] = mctx.ip;
462 ctx->uc_mcontext.gregs [REG_nPC] = mctx.ip + 4;
463 ctx->uc_mcontext.gregs [REG_SP] = mctx.sp;
464 window = (gpointer*)(((guint8*)mctx.sp) + MONO_SPARC_STACK_BIAS);
465 window [sparc_fp - 16] = mctx.fp;
471 mono_arch_ip_from_context (void *sigctx)
473 ucontext_t *ctx = (ucontext_t*)sigctx;
474 return (gpointer)ctx->uc_mcontext.gregs [REG_PC];