5 This code was written as part of the CMU Common Lisp project at
6 Carnegie Mellon University, and has been placed in the public domain.
19 #include "interrupt.h"
22 /* The header files may not define PT_DAR/PT_DSISR. This definition
23 is correct for all versions of ppc linux >= 2.0.30
25 As of DR2.1u4, MkLinux doesn't pass these registers to signal
26 handlers correctly; a patch is necessary in order to (partially)
29 Even with the patch, the DSISR may not have its 'write' bit set
30 correctly (it tends not to be set if the fault was caused by
31 something other than a protection violation.)
48 arch_get_bad_addr(int sig, siginfo_t *code, os_context_t *context)
50 unsigned long badinstr;
51 unsigned int *pc = (unsigned int *)(*os_context_pc_addr(context));
56 /* Make sure it's not the pc thats bogus, and that it was lisp code */
57 /* that caused the fault. */
58 if ((((unsigned long)pc) & 3) != 0 ||
59 ((pc < READ_ONLY_SPACE_START ||
60 pc >= READ_ONLY_SPACE_START+READ_ONLY_SPACE_SIZE) &&
61 ((lispobj *)pc < current_dynamic_space &&
62 (lispobj *)pc >= current_dynamic_space + DYNAMIC_SPACE_SIZE)))
66 addr = (os_vm_address_t) (*os_context_register_addr(context,PT_DAR));
72 arch_skip_instruction(os_context_t *context)
74 ((char*)*os_context_pc_addr(context)) +=4;
78 arch_internal_error_arguments(os_context_t *context)
80 return (unsigned char *)(*os_context_pc_addr(context)+4);
85 arch_pseudo_atomic_atomic(os_context_t *context)
87 return ((*os_context_register_addr(context,reg_ALLOC)) & 4);
90 #define PSEUDO_ATOMIC_INTERRUPTED_BIAS 0x7f000000
93 arch_set_pseudo_atomic_interrupted(os_context_t *context)
95 *os_context_register_addr(context,reg_NL3)
96 += PSEUDO_ATOMIC_INTERRUPTED_BIAS;
100 arch_install_breakpoint(void *pc)
102 unsigned long *ptr = (unsigned long *)pc;
103 unsigned long result = *ptr;
104 *ptr = (3<<26) | (5 << 21) | trap_Breakpoint;
105 os_flush_icache((os_vm_address_t) pc, sizeof(unsigned long));
110 arch_remove_breakpoint(void *pc, unsigned long orig_inst)
112 *(unsigned long *)pc = orig_inst;
113 os_flush_icache((os_vm_address_t) pc, sizeof(unsigned long));
116 static unsigned long *skipped_break_addr, displaced_after_inst;
117 static sigset_t orig_sigmask;
120 arch_do_displaced_inst(os_context_t *context,unsigned int orig_inst)
122 /* not sure how we ensure that we get the breakpoint reinstalled
123 * after doing this -dan */
124 unsigned long *pc = (unsigned long *)(*os_context_pc_addr(context));
126 orig_sigmask = *os_context_sigmask_addr(context);
127 sigaddset_blockable(os_context_sigmask_addr(context));
130 os_flush_icache((os_vm_address_t) pc, sizeof(unsigned long));
131 skipped_break_addr = pc;
135 sigtrap_handler(int signal, siginfo_t *siginfo, os_context_t *context)
140 #ifdef LISP_FEATURE_LINUX
141 os_restore_fp_control(context);
143 mask=(os_context_sigmask_addr(context));
145 code=*((u32 *)(*os_context_pc_addr(context)));
146 if (code == ((3 << 26) | (16 << 21) | (reg_ALLOC << 16))) {
147 /* twlti reg_ALLOC,0 - check for deferred interrupt */
148 *os_context_register_addr(context,reg_ALLOC)
149 -= PSEUDO_ATOMIC_INTERRUPTED_BIAS;
150 arch_skip_instruction(context);
151 /* interrupt or GC was requested in PA; now we're done with the
152 PA section we may as well get around to it */
153 interrupt_handle_pending(context);
157 if ((code >> 16) == ((3 << 10) | (6 << 5))) {
158 /* twllei reg_ZERO,N will always trap if reg_ZERO = 0 */
159 int trap = code & 0x1f, extra = (code >> 5) & 0x1f;
163 fake_foreign_function_call(context);
164 lose("%%primitive halt called; the party is over.\n");
168 interrupt_internal_error(signal, code, context, trap == trap_Cerror);
171 case trap_PendingInterrupt:
172 /* when do we run this branch instead of the twlti code above? */
173 arch_skip_instruction(context);
174 interrupt_handle_pending(context);
177 case trap_Breakpoint:
178 handle_breakpoint(signal, code, context);
181 case trap_FunEndBreakpoint:
182 *os_context_pc_addr(context)
183 =(int)handle_fun_end_breakpoint(signal, code, context);
186 case trap_AfterBreakpoint:
187 *skipped_break_addr = trap_Breakpoint;
188 skipped_break_addr = NULL;
189 *(unsigned long *)*os_context_pc_addr(context)
190 = displaced_after_inst;
191 *os_context_sigmask_addr(context)= orig_sigmask;
193 os_flush_icache((os_vm_address_t) *os_context_pc_addr(context),
194 sizeof(unsigned long));
198 interrupt_handle_now(signal, code, context);
202 if (((code >> 26) == 3) && (((code >> 21) & 31) == 24)) {
203 interrupt_internal_error(signal, code, context, 0);
206 interrupt_handle_now(signal, code, context);
210 void arch_install_interrupt_handlers()
212 undoably_install_low_level_interrupt_handler(SIGILL,sigtrap_handler);
213 undoably_install_low_level_interrupt_handler(SIGTRAP,sigtrap_handler);
217 extern lispobj call_into_lisp(lispobj fun, lispobj *args, int nargs);
219 lispobj funcall0(lispobj function)
221 lispobj *args = current_control_stack_pointer;
223 return call_into_lisp(function, args, 0);
226 lispobj funcall1(lispobj function, lispobj arg0)
228 lispobj *args = current_control_stack_pointer;
230 current_control_stack_pointer += 1;
233 return call_into_lisp(function, args, 1);
236 lispobj funcall2(lispobj function, lispobj arg0, lispobj arg1)
238 lispobj *args = current_control_stack_pointer;
240 current_control_stack_pointer += 2;
244 return call_into_lisp(function, args, 2);
247 lispobj funcall3(lispobj function, lispobj arg0, lispobj arg1, lispobj arg2)
249 lispobj *args = current_control_stack_pointer;
251 current_control_stack_pointer += 3;
256 return call_into_lisp(function, args, 3);
260 ppc_flush_icache(os_vm_address_t address, os_vm_size_t length)
262 os_vm_address_t end = (os_vm_address_t) ((int)(address+length+(32-1)) &~(32-1));
263 extern void ppc_flush_cache_line(os_vm_address_t);
265 while (address < end) {
266 ppc_flush_cache_line(address);