Newer
Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
/*
$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/lisp/ppc-arch.c,v 1.1 2004/07/13 00:26:22 pmai Exp $
This code was written as part of the CMU Common Lisp project at
Carnegie Mellon University, and has been placed in the public domain.
*/
#include <stdio.h>
#include "arch.h"
#include "lisp.h"
#include "internals.h"
#include "globals.h"
#include "validate.h"
#include "os.h"
#include "lispregs.h"
#include "signal.h"
#include "interrupt.h"
#include "interr.h"
/* The header files may not define PT_DAR/PT_DSISR. This definition
is correct for all versions of ppc linux >= 2.0.30
As of DR2.1u4, MkLinux doesn't pass these registers to signal
handlers correctly; a patch is necessary in order to (partially)
correct this.
Even with the patch, the DSISR may not have its 'write' bit set
correctly (it tends not to be set if the fault was caused by
something other than a protection violation.)
Caveat callers. */
#ifndef PT_DAR
#define PT_DAR 41
#endif
#ifndef PT_DSISR
#define PT_DSISR 42
#endif
char * arch_init(void)
{
return "lisp.core";
}
os_vm_address_t
arch_get_bad_addr(HANDLER_ARGS)
{
unsigned long badinstr, pc = SC_PC(context);
int instclass;
os_vm_address_t addr;
/* Make sure it's not the pc thats bogus, and that it was lisp code */
/* that caused the fault. */
if ((pc & 3) != 0 ||
((pc < READ_ONLY_SPACE_START ||
pc >= READ_ONLY_SPACE_START+READ_ONLY_SPACE_SIZE) &&
((lispobj *)pc < current_dynamic_space &&
(lispobj *)pc >= current_dynamic_space + DYNAMIC_SPACE_SIZE)))
return 0;
addr = (os_vm_address_t) SC_REG(context, PT_DAR);
return addr;
}
void
arch_skip_instruction(os_context_t *context)
{
/* Skip the offending instruction */
SC_PC(context) += 4;
}
unsigned char *
arch_internal_error_arguments(os_context_t *scp)
{
return (unsigned char *)(SC_PC(scp)+4);
}
boolean
arch_pseudo_atomic_atomic(os_context_t *scp)
{
return (SC_REG(scp, reg_ALLOC) & 4);
}
#define PSEUDO_ATOMIC_INTERRUPTED_BIAS 0x7f000000
void
arch_set_pseudo_atomic_interrupted(os_context_t *scp)
{
SC_REG(scp, reg_NL3) += PSEUDO_ATOMIC_INTERRUPTED_BIAS;
}
unsigned long
arch_install_breakpoint(void *pc)
{
unsigned long *ptr = (unsigned long *)pc;
unsigned long result = *ptr;
*ptr = (3<<26) | (5 << 21) | trap_Breakpoint;
os_flush_icache((os_vm_address_t) pc, sizeof(unsigned long));
return result;
}
void
arch_remove_breakpoint(void *pc, unsigned long orig_inst)
{
*(unsigned long *)pc = orig_inst;
os_flush_icache((os_vm_address_t) pc, sizeof(unsigned long));
}
static unsigned long *skipped_break_addr, displaced_after_inst;
static sigset_t orig_sigmask;
void
arch_do_displaced_inst(os_context_t *scp, unsigned long orig_inst)
{
unsigned long *pc = (unsigned long *)SC_PC(scp);
orig_sigmask = scp->uc_sigmask;
sigemptyset(&scp->uc_sigmask);
FILLBLOCKSET(&scp->uc_sigmask);
*pc = orig_inst;
os_flush_icache((os_vm_address_t) pc, sizeof(unsigned long));
skipped_break_addr = pc;
}
static void
sigill_handler(HANDLER_ARGS)
{
int badinst;
int opcode;
HANDLER_GET_CONTEXT
SAVE_CONTEXT();
sigprocmask(SIG_SETMASK, &context->uc_sigmask, 0);
opcode = *((int *) SC_PC(context));
if (opcode == ((3 << 26) | (16 << 21) | (reg_ALLOC << 16))) {
/* twlti reg_ALLOC,0 - check for deferred interrupt */
(SC_REG(context, reg_ALLOC) -= PSEUDO_ATOMIC_INTERRUPTED_BIAS);
arch_skip_instruction(context);
interrupt_handle_pending(context);
#ifdef DARWIN
/* Work around G5 bug; fix courtesy gbyers via chandler */
sigreturn(context);
#endif
return;
}
if ((opcode >> 16) == ((3 << 10) | (6 << 5))) {
/* twllei reg_ZERO,N will always trap if reg_ZERO = 0 */
int trap = opcode & 0x1f, extra = (opcode >> 5) & 0x1f;
switch (trap) {
case trap_Halt:
fake_foreign_function_call(context);
lose("%%primitive halt called; the party is over.\n");
case trap_Error:
case trap_Cerror:
interrupt_internal_error(signal, code, context, trap == trap_Cerror);
break;
case trap_PendingInterrupt:
arch_skip_instruction(context);
interrupt_handle_pending(context);
break;
case trap_Breakpoint:
handle_breakpoint(signal, code, context);
break;
case trap_FunctionEndBreakpoint:
SC_PC(context)=(int)handle_function_end_breakpoint(signal, code, context);
break;
case trap_AfterBreakpoint:
*skipped_break_addr = trap_Breakpoint;
skipped_break_addr = NULL;
*(unsigned long *)SC_PC(context) = displaced_after_inst;
context->uc_sigmask = orig_sigmask;
os_flush_icache((os_vm_address_t) SC_PC(context),
sizeof(unsigned long));
break;
default:
interrupt_handle_now(signal, code, context);
break;
}
#ifdef DARWIN
/* Work around G5 bug; fix courtesy gbyers via chandler */
sigreturn(context);
#endif
return;
}
if (((opcode >> 26) == 3) && (((opcode >> 21) & 31) == 24)) {
interrupt_internal_error(signal, code, context, 0);
#ifdef DARWIN
/* Work around G5 bug; fix courtesy gbyers via chandler */
sigreturn(context);
#endif
return;
}
interrupt_handle_now(signal, code, context);
#ifdef DARWIN
/* Work around G5 bug; fix courtesy gbyers via chandler */
sigreturn(context);
#endif
}
void arch_install_interrupt_handlers()
{
interrupt_install_low_level_handler(SIGILL,sigill_handler);
interrupt_install_low_level_handler(SIGTRAP,sigill_handler);
}
extern lispobj call_into_lisp(lispobj fun, lispobj *args, int nargs);
lispobj funcall0(lispobj function)
{
lispobj *args = current_control_stack_pointer;
return call_into_lisp(function, args, 0);
}
lispobj funcall1(lispobj function, lispobj arg0)
{
lispobj *args = current_control_stack_pointer;
current_control_stack_pointer += 1;
args[0] = arg0;
return call_into_lisp(function, args, 1);
}
lispobj funcall2(lispobj function, lispobj arg0, lispobj arg1)
{
lispobj *args = current_control_stack_pointer;
current_control_stack_pointer += 2;
args[0] = arg0;
args[1] = arg1;
return call_into_lisp(function, args, 2);
}
lispobj funcall3(lispobj function, lispobj arg0, lispobj arg1, lispobj arg2)
{
lispobj *args = current_control_stack_pointer;
current_control_stack_pointer += 3;
args[0] = arg0;
args[1] = arg1;
args[2] = arg2;
return call_into_lisp(function, args, 3);
}
void
ppc_flush_icache(os_vm_address_t address, os_vm_size_t length)
{
os_vm_address_t end = (os_vm_address_t) ((int)(address+length+(32-1)) &~(32-1));
extern void ppc_flush_cache_line(os_vm_address_t);
while (address < end) {
ppc_flush_cache_line(address);
address += 32;
}
}