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>
27 #include "mini-sparc.h"
33 #define MONO_SPARC_WINDOW_ADDR(sp) ((gpointer*)(((guint8*)(sp)) + MONO_SPARC_STACK_BIAS))
36 * mono_arch_get_restore_context:
38 * Returns a pointer to a method which restores a previously saved sigcontext.
41 mono_arch_get_restore_context (void)
43 static guint32 start [32];
44 static int inited = 0;
52 sparc_ldi_imm (code, sparc_o0, G_STRUCT_OFFSET (MonoContext, ip), sparc_i7);
53 sparc_ldi_imm (code, sparc_o0, G_STRUCT_OFFSET (MonoContext, sp), sparc_i6);
55 sparc_jmpl_imm (code, sparc_i7, 0, sparc_g0);
56 /* FIXME: This does not return to the correct window */
57 sparc_restore_imm (code, sparc_g0, 0, sparc_g0);
59 g_assert ((code - start) < 32);
67 * mono_arch_get_call_filter:
69 * Returns a pointer to a method which calls an exception filter. We
70 * also use this function to call finally handlers (we pass NULL as
71 * @exc object in this case).
73 * call_filter (MonoContext *ctx, gpointer ip)
76 mono_arch_get_call_filter (void)
78 static guint32 start [64];
79 static int inited = 0;
89 * There are two frames here:
90 * - the first frame is used by call_filter
91 * - the second frame is used to run the filter code
94 /* Create first frame */
95 sparc_save_imm (code, sparc_sp, -256, sparc_sp);
97 sparc_mov_reg_reg (code, sparc_i1, sparc_o0);
98 sparc_ldi_imm (code, sparc_i0, G_STRUCT_OFFSET (MonoContext, sp), sparc_o1);
100 /* Create second frame */
101 sparc_save_imm (code, sparc_sp, -256, sparc_sp);
103 sparc_mov_reg_reg (code, sparc_i0, sparc_o0);
104 sparc_mov_reg_reg (code, sparc_i1, sparc_o1);
107 * We need to change %fp to point to the stack frame of the method
108 * containing the filter. But changing %fp also changes the %sp of
109 * the parent frame (the first frame), so if the OS saves the first frame,
110 * it saves it to the stack frame of the method, which is not good.
111 * So flush all register windows to memory before changing %fp.
115 sparc_mov_reg_reg (code, sparc_fp, sparc_o7);
118 * Modify the second frame so it is identical to the one used in the
119 * method containing the filter.
121 for (i = 0; i < 16; ++i)
122 sparc_ldi_imm (code, sparc_o1, MONO_SPARC_STACK_BIAS + i * sizeof (gpointer), sparc_l0 + i);
124 /* Save %fp to a location reserved in mono_arch_allocate_vars */
125 sparc_sti_imm (code, sparc_o7, sparc_fp, MONO_SPARC_STACK_BIAS - sizeof (gpointer));
127 /* Call the filter code, after this returns, %o0 will hold the result */
128 sparc_call_imm (code, sparc_o0, 0);
131 /* Restore original %fp */
132 sparc_ldi_imm (code, sparc_fp, MONO_SPARC_STACK_BIAS - sizeof (gpointer), sparc_fp);
134 sparc_mov_reg_reg (code, sparc_o0, sparc_i0);
136 /* Return to first frame */
137 sparc_restore (code, sparc_g0, sparc_g0, sparc_g0);
139 /* FIXME: Save locals to the stack */
141 /* Return to caller */
143 /* Return result in delay slot */
144 sparc_restore (code, sparc_o0, sparc_g0, sparc_o0);
146 g_assert ((code - start) < 64);
154 throw_exception (MonoObject *exc, gpointer sp, gpointer ip, gboolean rethrow)
157 static void (*restore_context) (MonoContext *);
160 if (!restore_context)
161 restore_context = mono_arch_get_restore_context ();
163 window = MONO_SPARC_WINDOW_ADDR (sp);
164 ctx.sp = (gpointer*)sp;
166 ctx.fp = (gpointer*)(MONO_SPARC_WINDOW_ADDR (sp) [sparc_i6 - 16]);
168 if (mono_object_isinst (exc, mono_defaults.exception_class)) {
169 MonoException *mono_ex = (MonoException*)exc;
171 mono_ex->stack_trace = NULL;
173 mono_handle_exception (&ctx, exc, ip, FALSE);
174 restore_context (&ctx);
176 g_assert_not_reached ();
180 get_throw_exception (gboolean rethrow)
182 guint32 *start, *code;
184 code = start = g_malloc (16 * sizeof (guint32));
186 sparc_save_imm (code, sparc_sp, -512, sparc_sp);
189 sparc_mov_reg_reg (code, sparc_i0, sparc_o0);
190 sparc_mov_reg_reg (code, sparc_fp, sparc_o1);
191 sparc_mov_reg_reg (code, sparc_i7, sparc_o2);
192 sparc_set (code, rethrow, sparc_o3);
193 sparc_set (code, throw_exception, sparc_o7);
194 sparc_jmpl (code, sparc_o7, sparc_g0, sparc_callsite);
197 g_assert ((code - start) <= 16);
203 * mono_arch_get_throw_exception:
205 * Returns a function pointer which can be used to raise exceptions.
206 * The returned function has the following
207 * signature: void (*func) (MonoException *exc);
210 mono_arch_get_throw_exception (void)
212 static guint32* start;
213 static int inited = 0;
220 start = get_throw_exception (FALSE);
226 mono_arch_get_rethrow_exception (void)
228 static guint32* start;
229 static int inited = 0;
236 start = get_throw_exception (TRUE);
242 * mono_arch_get_throw_exception_by_name:
244 * Returns a function pointer which can be used to raise
245 * corlib exceptions. The returned function has the following
246 * signature: void (*func) (char *exc_name, gpointer ip);
249 mono_arch_get_throw_exception_by_name (void)
251 static guint32 start [64];
252 static int inited = 0;
268 sparc_save_imm (code, sparc_sp, -160, sparc_sp);
270 sparc_mov_reg_reg (code, sparc_i0, sparc_o2);
271 sparc_set (code, mono_defaults.corlib, sparc_o0);
272 sparc_set (code, "System", sparc_o1);
273 sparc_set (code, mono_exception_from_name, sparc_o7);
274 sparc_jmpl (code, sparc_o7, sparc_g0, sparc_callsite);
277 /* Return to the caller, so exception handling does not see this frame */
278 sparc_restore (code, sparc_o0, sparc_g0, sparc_o0);
280 /* Put original return address into %o7 */
281 sparc_mov_reg_reg (code, sparc_o1, sparc_o7);
282 sparc_set (code, mono_arch_get_throw_exception (), reg);
283 /* Use a jmp instead of a call so o7 is preserved */
284 sparc_jmpl_imm (code, reg, 0, sparc_g0);
287 g_assert ((code - start) < 32);
292 /* mono_arch_find_jit_info:
294 * This function is used to gather information from @ctx. It return the
295 * MonoJitInfo of the corresponding function, unwinds one stack frame and
296 * stores the resulting context into @new_ctx. It also stores a string
297 * describing the stack location into @trace (if not NULL), and modifies
298 * the @lmf if necessary. @native_offset return the IP offset from the
299 * start of the function or -1 if that info is not available.
302 mono_arch_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
303 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
307 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
310 /* Avoid costly table lookup during stack overflow */
311 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
314 ji = mono_jit_info_table_find (domain, ip);
323 if (!ji->method->wrapper_type)
326 if (*lmf && (MONO_CONTEXT_GET_BP (ctx) >= (gpointer)(*lmf)->ebp)) {
327 /* remove any unused lmf */
328 *lmf = (*lmf)->previous_lmf;
331 /* Restore ip and sp from the saved register window */
332 window = MONO_SPARC_WINDOW_ADDR (ctx->sp);
333 new_ctx->ip = window [sparc_i7 - 16];
334 new_ctx->sp = (gpointer*)(window [sparc_i6 - 16]);
335 new_ctx->fp = (gpointer*)(MONO_SPARC_WINDOW_ADDR (new_ctx->sp) [sparc_i6 - 16]);
349 if ((ji = mono_jit_info_table_find (domain, (gpointer)(*lmf)->ip))) {
352 memset (res, 0, sizeof (MonoJitInfo));
353 res->method = (*lmf)->method;
356 new_ctx->ip = (*lmf)->ip;
357 new_ctx->sp = (*lmf)->sp;
358 new_ctx->fp = (*lmf)->ebp;
360 *lmf = (*lmf)->previous_lmf;
367 mono_arch_has_unwind_info (gconstpointer addr)
373 mono_arch_handle_exception (void *sigctx, gpointer obj, gboolean test_only)
376 ucontext_t *ctx = (ucontext_t*)sigctx;
380 * Access to the machine state using the ucontext_t parameter is somewhat
381 * under documented under solaris. The code below seems to work under
385 g_assert (!ctx->uc_mcontext.gwins);
387 /* better, but doesn't work all the time. need to rethink! */
388 g_assert (!ctx->uc_mcontext.gregs);
391 mctx.ip = ctx->uc_mcontext.gregs [REG_PC];
392 mctx.sp = ctx->uc_mcontext.gregs [REG_SP];
393 window = (gpointer*)(((guint8*)mctx.sp) + MONO_SPARC_STACK_BIAS);
394 mctx.fp = window [sparc_fp - 16];
396 mono_handle_exception (&mctx, obj, mctx.ip, test_only);
398 /* We can't use restore_context to return from a signal handler */
399 ctx->uc_mcontext.gregs [REG_PC] = mctx.ip;
400 ctx->uc_mcontext.gregs [REG_nPC] = mctx.ip + 4;
401 ctx->uc_mcontext.gregs [REG_SP] = mctx.sp;
402 window = (gpointer*)(((guint8*)mctx.sp) + MONO_SPARC_STACK_BIAS);
403 window [sparc_fp - 16] = mctx.fp;
409 mono_arch_ip_from_context (void *sigctx)
411 ucontext_t *ctx = (ucontext_t*)sigctx;
412 return (gpointer)ctx->uc_mcontext.gregs [REG_PC];