* Merged executionstate branch.
[cacao.git] / src / vm / jit / powerpc64 / linux / md-os.c
1 /* src/vm/jit/powerpc64/linux/md-os.c - machine dependent PowerPC64 Linux functions
2
3    Copyright (C) 1996-2005, 2006, 2007, 2008
4    CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
5
6    This file is part of CACAO.
7
8    This program is free software; you can redistribute it and/or
9    modify it under the terms of the GNU General Public License as
10    published by the Free Software Foundation; either version 2, or (at
11    your option) any later version.
12
13    This program is distributed in the hope that it will be useful, but
14    WITHOUT ANY WARRANTY; without even the implied warranty of
15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16    General Public License for more details.
17
18    You should have received a copy of the GNU General Public License
19    along with this program; if not, write to the Free Software
20    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21    02110-1301, USA.
22
23 */
24
25
26 #include "config.h"
27
28 #include <assert.h>
29 #include <stdint.h>
30 #include <ucontext.h>
31
32 #include "vm/types.h"
33
34 #include "vm/jit/powerpc64/codegen.h"
35 #include "vm/jit/powerpc64/md.h"
36 #include "vm/jit/powerpc64/linux/md-abi.h"
37
38 #include "threads/thread.h"
39
40 #include "vm/builtin.h"
41 #include "vm/exceptions.h"
42 #include "vm/signallocal.h"
43
44 #include "vm/jit/asmpart.h"
45
46 #if defined(ENABLE_PROFILING)
47 # include "vm/jit/optimizing/profile.h"
48 #endif
49
50 #include "vm/jit/stacktrace.h"
51
52
53 /* md_signal_handler_sigsegv ***************************************************
54  
55         Signal handler for hardware-exceptions.
56
57 *******************************************************************************/
58
59 void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
60 {
61         ucontext_t     *_uc;
62         mcontext_t     *_mc;
63         u1             *pv;
64         u1             *sp;
65         u1             *ra;
66         u1             *xpc;
67         u4              mcode;
68         int             s1;
69         int16_t         disp;
70         int             d;
71         int             type;
72         intptr_t        addr;
73         intptr_t        val;
74         void           *p;
75
76         _uc = (ucontext_t *) _p;
77         _mc = &(_uc->uc_mcontext);
78
79         /* get register values */
80
81         pv = (u1*) _mc->gp_regs[REG_PV];
82         sp = (u1*) _mc->gp_regs[REG_SP];
83         ra = (u1*) _mc->gp_regs[PT_LNK];                     /* correct for leafs */
84         xpc =(u1*) _mc->gp_regs[PT_NIP];
85
86         /* get the throwing instruction */
87
88         mcode = *((u4*)xpc);
89
90         s1   = M_INSTR_OP2_IMM_A(mcode);
91         disp = M_INSTR_OP2_IMM_I(mcode);
92         d    = M_INSTR_OP2_IMM_D(mcode);
93
94         val  = _mc->gp_regs[d];
95
96         if (s1 == REG_ZERO) {
97                 /* we use the exception type as load displacement */
98                 type = disp;
99
100                 if (type == EXCEPTION_HARDWARE_COMPILER) {
101                         /* The XPC is the RA minus 1, because the RA points to the
102                            instruction after the call. */
103
104                         xpc = ra - 4;
105                 }
106         }
107         else {
108                 /* normal NPE */
109                 addr = _mc->gp_regs[s1];
110                 type = (int) addr;
111         }
112
113         /* Handle the type. */
114
115         p = signal_handle(type, val, pv, sp, ra, xpc, _p);
116
117         /* Set registers. */
118
119         switch (type) {
120         case EXCEPTION_HARDWARE_COMPILER:
121                 if (p != NULL) {
122                         _mc->gp_regs[REG_PV] = (uintptr_t) p;
123                         _mc->gp_regs[PT_NIP] = (uintptr_t) p;
124                         break;
125                 }
126
127                 /* Get and set the PV from the parent Java method. */
128
129                 pv = md_codegen_get_pv_from_pc(ra);
130
131                 _mc->gp_regs[REG_PV] = (uintptr_t) pv;
132
133                 /* Get the exception object. */
134
135                 p = builtin_retrieve_exception();
136
137                 assert(p != NULL);
138
139                 /* fall-through */
140
141         case EXCEPTION_HARDWARE_PATCHER:
142                 if (p == NULL)
143                         break;
144
145                 /* fall-through */
146                 
147         default:
148                 _mc->gp_regs[REG_ITMP1_XPTR] = (uintptr_t) p;
149                 _mc->gp_regs[REG_ITMP2_XPC]  = (uintptr_t) xpc;
150                 _mc->gp_regs[PT_NIP]         = (uintptr_t) asm_handle_exception;
151         }
152 }
153
154
155 /* md_signal_handler_sigusr2 ***************************************************
156
157    Signal handler for profiling sampling.
158
159 *******************************************************************************/
160
161 #if defined(ENABLE_THREADS)
162 void md_signal_handler_sigusr2(int sig, siginfo_t *siginfo, void *_p)
163 {
164         threadobject *tobj;
165         ucontext_t   *_uc;
166         mcontext_t   *_mc;
167         u1           *pc;
168
169         tobj = THREADOBJECT;
170
171         _uc = (ucontext_t *) _p;
172         _mc = &(_uc->uc_mcontext);
173
174         pc = (u1 *) _mc->gp_regs[PT_NIP];
175
176         tobj->pc = pc;
177 }
178 #endif
179
180
181 /* md_critical_section_restart *************************************************
182
183    Search the critical sections tree for a matching section and set
184    the PC to the restart point, if necessary.
185
186 *******************************************************************************/
187
188 #if defined(ENABLE_THREADS)
189 void md_critical_section_restart(ucontext_t *_uc)
190 {
191         mcontext_t *_mc;
192         u1         *pc;
193         u1         *npc;
194
195         _mc = &(_uc->uc_mcontext);
196
197         pc = (u1 *) _mc->gp_regs[PT_NIP];
198
199         npc = critical_find_restart_point(pc);
200
201         if (npc != NULL)
202                 _mc->gp_regs[PT_NIP] = (ptrint) npc;
203 }
204 #endif
205
206
207 /*
208  * These are local overrides for various environment variables in Emacs.
209  * Please do not remove this and leave it at the end of the file, where
210  * Emacs will automagically detect them.
211  * ---------------------------------------------------------------------
212  * Local variables:
213  * mode: c
214  * indent-tabs-mode: t
215  * c-basic-offset: 4
216  * tab-width: 4
217  * End:
218  */