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 mask=(os_context_sigmask_addr(context));
142 code=*((u32 *)(*os_context_pc_addr(context)));
143 if (code == ((3 << 26) | (16 << 21) | (reg_ALLOC << 16))) {
144 /* twlti reg_ALLOC,0 - check for deferred interrupt */
145 *os_context_register_addr(context,reg_ALLOC)
146 -= PSEUDO_ATOMIC_INTERRUPTED_BIAS;
147 arch_skip_instruction(context);
148 /* interrupt or GC was requested in PA; now we're done with the
149 PA section we may as well get around to it */
150 interrupt_handle_pending(context);
154 if ((code >> 16) == ((3 << 10) | (6 << 5))) {
155 /* twllei reg_ZERO,N will always trap if reg_ZERO = 0 */
156 int trap = code & 0x1f, extra = (code >> 5) & 0x1f;
160 fake_foreign_function_call(context);
161 lose("%%primitive halt called; the party is over.\n");
165 interrupt_internal_error(signal, code, context, trap == trap_Cerror);
168 case trap_PendingInterrupt:
169 /* when do we run this branch instead of the twlti code above? */
170 arch_skip_instruction(context);
171 interrupt_handle_pending(context);
174 case trap_Breakpoint:
175 handle_breakpoint(signal, code, context);
178 case trap_FunEndBreakpoint:
179 *os_context_pc_addr(context)
180 =(int)handle_fun_end_breakpoint(signal, code, context);
183 case trap_AfterBreakpoint:
184 *skipped_break_addr = trap_Breakpoint;
185 skipped_break_addr = NULL;
186 *(unsigned long *)*os_context_pc_addr(context)
187 = displaced_after_inst;
188 *os_context_sigmask_addr(context)= orig_sigmask;
190 os_flush_icache((os_vm_address_t) *os_context_pc_addr(context),
191 sizeof(unsigned long));
195 interrupt_handle_now(signal, code, context);
199 if (((code >> 26) == 3) && (((code >> 21) & 31) == 24)) {
200 interrupt_internal_error(signal, code, context, 0);
203 interrupt_handle_now(signal, code, context);
207 void arch_install_interrupt_handlers()
209 undoably_install_low_level_interrupt_handler(SIGILL,sigtrap_handler);
210 undoably_install_low_level_interrupt_handler(SIGTRAP,sigtrap_handler);
214 extern lispobj call_into_lisp(lispobj fun, lispobj *args, int nargs);
216 lispobj funcall0(lispobj function)
218 lispobj *args = current_control_stack_pointer;
220 return call_into_lisp(function, args, 0);
223 lispobj funcall1(lispobj function, lispobj arg0)
225 lispobj *args = current_control_stack_pointer;
227 current_control_stack_pointer += 1;
230 return call_into_lisp(function, args, 1);
233 lispobj funcall2(lispobj function, lispobj arg0, lispobj arg1)
235 lispobj *args = current_control_stack_pointer;
237 current_control_stack_pointer += 2;
241 return call_into_lisp(function, args, 2);
244 lispobj funcall3(lispobj function, lispobj arg0, lispobj arg1, lispobj arg2)
246 lispobj *args = current_control_stack_pointer;
248 current_control_stack_pointer += 3;
253 return call_into_lisp(function, args, 3);
257 ppc_flush_icache(os_vm_address_t address, os_vm_size_t length)
259 os_vm_address_t end = (os_vm_address_t) ((int)(address+length+(32-1)) &~(32-1));
260 extern void ppc_flush_cache_line(os_vm_address_t);
262 while (address < end) {
263 ppc_flush_cache_line(address);