2 * This software is part of the SBCL system. See the README file for
5 * This software is derived from the CMU CL system, which was
6 * written at Carnegie Mellon University and released into the
7 * public domain. The software is in the public domain and is
8 * provided with absolutely no warranty. See the COPYING and CREDITS
9 * files for more information.
22 #include "interrupt.h"
24 #include "breakpoint.h"
27 #ifdef LISP_FEATURE_LINUX
28 extern int linux_sparc_siginfo_bug;
36 os_vm_address_t arch_get_bad_addr(int sig, siginfo_t *code, os_context_t *context)
42 pc = (unsigned int *)(*os_context_pc_addr(context));
44 /* On the sparc, we have to decode the instruction. */
46 /* Make sure it's not the pc thats bogus, and that it was lisp code */
47 /* that caused the fault. */
48 if ((unsigned long) pc & 3) {
52 if ((pc < READ_ONLY_SPACE_START ||
53 pc >= READ_ONLY_SPACE_START+READ_ONLY_SPACE_SIZE) &&
54 (pc < current_dynamic_space ||
55 pc >= current_dynamic_space + dynamic_space_size)) {
61 if ((badinst >> 30) != 3)
62 /* All load/store instructions have op = 11 (binary) */
65 rs1 = (badinst>>14)&0x1f;
67 if (badinst & (1<<13)) {
68 /* r[rs1] + simm(13) */
69 int simm13 = badinst & 0x1fff;
74 return (os_vm_address_t)
75 (*os_context_register_addr(context, rs1)+simm13);
79 int rs2 = badinst & 0x1f;
81 return (os_vm_address_t)
82 (*os_context_register_addr(context, rs1) +
83 *os_context_register_addr(context, rs2));
87 void arch_skip_instruction(os_context_t *context)
89 *os_context_pc_addr(context) = *os_context_npc_addr(context);
90 /* Note that we're doing integer arithmetic here, not pointer. So
91 * the value that the return value of os_context_npc_addr() points
92 * to will be incremented by 4, not 16.
94 *os_context_npc_addr(context) += 4;
97 unsigned char *arch_internal_error_arguments(os_context_t *context)
99 return (unsigned char *)(*os_context_pc_addr(context) + 4);
102 boolean arch_pseudo_atomic_atomic(os_context_t *context)
104 return ((*os_context_register_addr(context,reg_ALLOC)) & 4);
107 void arch_set_pseudo_atomic_interrupted(os_context_t *context)
109 *os_context_register_addr(context,reg_ALLOC) |= 1;
112 void arch_clear_pseudo_atomic_interrupted(os_context_t *context)
114 *os_context_register_addr(context,reg_ALLOC) &= ~1;
117 unsigned int arch_install_breakpoint(void *pc)
119 unsigned int *ptr = (unsigned int *)pc;
120 unsigned int result = *ptr;
121 *ptr = trap_Breakpoint;
123 os_flush_icache((os_vm_address_t) pc, sizeof(unsigned int));
128 void arch_remove_breakpoint(void *pc, unsigned int orig_inst)
130 *(unsigned int *)pc = orig_inst;
131 os_flush_icache((os_vm_address_t) pc, sizeof(unsigned int));
135 * Perform the instruction that we overwrote with a breakpoint. As we
136 * don't have a single-step facility, this means we have to:
137 * - put the instruction back
138 * - put a second breakpoint at the following instruction,
139 * set after_breakpoint and continue execution.
141 * When the second breakpoint is hit (very shortly thereafter, we hope)
142 * sigtrap_handler gets called again, but follows the AfterBreakpoint
144 * - puts a bpt back in the first breakpoint place (running across a
145 * breakpoint shouldn't cause it to be uninstalled)
146 * - replaces the second bpt with the instruction it was meant to be
151 static unsigned int *skipped_break_addr, displaced_after_inst;
152 static sigset_t orig_sigmask;
154 void arch_do_displaced_inst(os_context_t *context, unsigned int orig_inst)
156 unsigned int *pc = (unsigned int *)(*os_context_pc_addr(context));
157 unsigned int *npc = (unsigned int *)(*os_context_npc_addr(context));
159 /* orig_sigmask = context->sigmask;
160 sigemptyset(&context->sigmask); */
162 /* FILLBLOCKSET(&context->uc_sigmask);*/
165 os_flush_icache((os_vm_address_t) pc, sizeof(unsigned int));
166 skipped_break_addr = pc;
167 displaced_after_inst = *npc;
168 *npc = trap_AfterBreakpoint;
169 os_flush_icache((os_vm_address_t) npc, sizeof(unsigned int));
173 static int pseudo_atomic_trap_p(os_context_t *context)
176 unsigned int badinst;
180 pc = (unsigned int*) *os_context_pc_addr(context);
184 /* Check to see if the current instruction is a pseudo-atomic-trap */
185 if (((badinst >> 30) == 2) && (((badinst >> 19) & 0x3f) == 0x3a)
186 && (((badinst >> 13) & 1) == 1) && ((badinst & 0x7f) == PSEUDO_ATOMIC_TRAP))
188 unsigned int previnst;
191 * Check to see if the previous instruction was an andcc alloc-tn,
192 * 3, zero-tn instruction.
194 if (((previnst >> 30) == 2) && (((previnst >> 19) & 0x3f) == 0x11)
195 && (((previnst >> 14) & 0x1f) == reg_ALLOC)
196 && (((previnst >> 25) & 0x1f) == reg_ZERO)
197 && (((previnst >> 13) & 1) == 1)
198 && ((previnst & 0x1fff) == 3))
204 fprintf(stderr, "Oops! Got a PSEUDO-ATOMIC-TRAP without a preceeding andcc!\n");
211 arch_handle_breakpoint(os_context_t *context)
213 handle_breakpoint(context);
217 arch_handle_fun_end_breakpoint(os_context_t *context)
219 *os_context_pc_addr(context) = (int) handle_fun_end_breakpoint(context);
220 *os_context_npc_addr(context) = *os_context_pc_addr(context) + 4;
224 arch_handle_after_breakpoint(os_context_t *context)
226 *skipped_break_addr = trap_Breakpoint;
227 os_flush_icache(skipped_break_addr, sizeof(unsigned int));
228 skipped_break_addr = NULL;
229 *(unsigned long *) os_context_pc_addr(context) = displaced_after_inst;
230 /* context->sigmask = orig_sigmask; */
231 os_flush_icache((os_vm_address_t) os_context_pc_addr(context), sizeof(unsigned int));
234 static void sigill_handler(int signal, siginfo_t *siginfo, void *void_context)
236 os_context_t *context = arch_os_get_context(&void_context);
237 #ifdef LISP_FEATURE_LINUX
238 /* FIXME: Check that this is necessary -- CSR, 2002-07-15 */
239 os_restore_fp_control(context);
242 if ((siginfo->si_code) == ILL_ILLOPC
243 #ifdef LISP_FEATURE_LINUX
244 || (linux_sparc_siginfo_bug && (siginfo->si_code == 2))
249 unsigned int* pc = (unsigned int*) siginfo->si_addr;
252 trap = inst & 0x3fffff;
253 handle_trap(context,trap);
255 else if ((siginfo->si_code) == ILL_ILLTRP
256 #ifdef LISP_FEATURE_LINUX
257 || (linux_sparc_siginfo_bug && (siginfo->si_code) == 192)
260 if (pseudo_atomic_trap_p(context)) {
261 /* A trap instruction from a pseudo-atomic. We just need
262 to fixup up alloc-tn to remove the interrupted flag,
263 skip over the trap instruction, and then handle the
264 pending interrupt(s). */
265 arch_clear_pseudo_atomic_interrupted(context);
266 arch_skip_instruction(context);
267 interrupt_handle_pending(context);
270 interrupt_internal_error(context, 0);
274 interrupt_handle_now(signal, siginfo, context);
278 static void sigemt_handler(int signal, siginfo_t *siginfo, void *void_context)
280 unsigned int badinst;
281 boolean subtract, immed;
282 int rd, rs1, op1, rs2, op2, result;
283 os_context_t *context = arch_os_get_context(&void_context);
284 #ifdef LISP_FEATURE_LINUX
285 os_restore_fp_control(context);
288 badinst = *(unsigned int *)os_context_pc_addr(context);
289 if ((badinst >> 30) != 2 || ((badinst >> 20) & 0x1f) != 0x11) {
290 /* It wasn't a tagged add. Pass the signal into lisp. */
291 interrupt_handle_now(signal, siginfo, context);
295 fprintf(stderr, "SIGEMT trap handler with tagged op instruction!\n");
297 /* Extract the parts of the inst. */
298 subtract = badinst & (1<<19);
299 rs1 = (badinst>>14) & 0x1f;
300 op1 = *os_context_register_addr(context, rs1);
302 /* If the first arg is $ALLOC then it is really a signal-pending note */
303 /* for the pseudo-atomic noise. */
304 if (rs1 == reg_ALLOC) {
305 /* Perform the op anyway. */
306 op2 = badinst & 0x1fff;
313 /* KLUDGE: this & ~7 is a little bit magical but basically
314 clears pseudo_atomic bits if any */
315 *os_context_register_addr(context, reg_ALLOC) = result & ~7;
316 arch_skip_instruction(context);
317 interrupt_handle_pending(context);
321 if ((op1 & 3) != 0) {
322 /* The first arg wan't a fixnum. */
323 interrupt_internal_error(context, 0);
327 if (immed = badinst & (1<<13)) {
328 op2 = badinst & 0x1fff;
333 rs2 = badinst & 0x1f;
334 op2 = *os_context_register_addr(context, rs2);
337 if ((op2 & 3) != 0) {
338 /* The second arg wan't a fixnum. */
339 interrupt_internal_error(context, 0);
343 rd = (badinst>>25) & 0x1f;
345 /* Don't bother computing the result unless we are going to use it. */
347 result = (op1>>2) - (op2>>2);
349 result = (op1>>2) + (op2>>2);
351 dynamic_space_free_pointer =
352 (lispobj *) *os_context_register_addr(context, reg_ALLOC);
354 *os_context_register_addr(context, rd) = alloc_number(result);
356 *os_context_register_addr(context, reg_ALLOC) =
357 (unsigned long) dynamic_space_free_pointer;
360 arch_skip_instruction(context);
363 void arch_install_interrupt_handlers()
365 undoably_install_low_level_interrupt_handler(SIGILL , sigill_handler);
366 undoably_install_low_level_interrupt_handler(SIGEMT, sigemt_handler);
370 #ifdef LISP_FEATURE_LINKAGE_TABLE
372 /* This a naive port from CMUCL/sparc, which was mostly stolen from the
373 * CMUCL/x86 version, with adjustments for sparc
375 * Linkage entry size is 16, because we need at least 3 instruction to
378 * sethi %hi(addr), %g4
379 * jmpl [%g4 + %lo(addr)], %g5
382 * The Sparc V9 ABI seems to use 8 words for its jump tables. Maybe
383 * we should do the same?
387 * Define the registers to use in the linkage jump table. Can be the
388 * same. Some care must be exercised when choosing these. It has to be
389 * a register that is not otherwise being used. reg_L0 is a good
390 * choice. call_into_c trashes reg_L0 without preserving it, so we can
391 * trash it in the linkage jump table.
393 #define LINKAGE_TEMP_REG reg_L0
394 #define LINKAGE_ADDR_REG reg_L0
397 * Insert the necessary jump instructions at the given address.
400 arch_write_linkage_table_jmp(void* reloc_addr, void *target_addr)
403 * Make JMP to function entry.
405 * The instruction sequence is:
407 * sethi %hi(addr), temp_reg
408 * jmp %temp_reg + %lo(addr), %addr_reg
414 unsigned long hi; /* Top 22 bits of address */
415 unsigned long lo; /* Low 10 bits of address */
418 inst_ptr = (int*) reloc_addr;
421 * Split the target address into hi and lo parts for the sethi
422 * instruction. hi is the top 22 bits. lo is the low 10 bits.
424 hi = (unsigned long) target_addr;
429 * sethi %hi(addr), temp_reg
432 inst = (0 << 30) | (LINKAGE_TEMP_REG << 25) | (4 << 22) | hi;
436 * jmpl [temp_reg + %lo(addr)], addr_reg
439 inst = (2U << 30) | (LINKAGE_ADDR_REG << 25) | (0x38 << 19)
440 | (LINKAGE_TEMP_REG << 14) | (1 << 13) | lo;
443 /* nop (really sethi 0, %g0) */
445 inst = (0 << 30) | (0 << 25) | (4 << 22) | 0;
450 os_flush_icache((os_vm_address_t) reloc_addr, (char*) inst_ptr - (char*) reloc_addr);
454 arch_write_linkage_table_ref(void * reloc_addr, void *target_addr)
456 *(unsigned long *)reloc_addr = (unsigned long)target_addr;