| blob | b05def49f5ae3c5b4390ef6b104f0bc7592ba674 |
1 /*
2 * very-low-level utilities for runtime support
3 */
5 /*
6 * This software is part of the SBCL system. See the README file for
7 * more information.
8 *
9 * This software is derived from the CMU CL system, which was
10 * written at Carnegie Mellon University and released into the
11 * public domain. The software is in the public domain and is
12 * provided with absolutely no warranty. See the COPYING and CREDITS
13 * files for more information.
14 */
15 \f
16 #define LANGUAGE_ASSEMBLY
17 #include "sbcl.h"
18 #include "validate.h"
19 #include "genesis/closure.h"
20 #include "genesis/funcallable-instance.h"
21 #include "genesis/fdefn.h"
22 #include "genesis/static-symbols.h"
23 #include "genesis/symbol.h"
24 #include "genesis/thread.h"
26 /* Minimize conditionalization for different OS naming schemes.
27 *
28 * (As of sbcl-0.8.10, this seems no longer to be much of an issue,
29 * since everyone has converged on ELF. If this generality really
30 * turns out not to matter, perhaps it's just clutter we could get
31 * rid of? -- WHN 2004-04-18)
32 *
33 * (Except Win32, which is unlikely ever to be ELF, sorry. -- AB 2005-12-08)
34 */
35 #if defined __linux__ || defined LISP_FEATURE_FREEBSD || defined __NetBSD__ || defined __OpenBSD__ || \
36 defined __sun || defined __DragonFly__
37 #define GNAME(var) var
38 #else
39 #define GNAME(var) _##var
40 #endif
42 /* Get the right type of alignment. Linux, FreeBSD and NetBSD (but not OpenBSD)
43 * want alignment in bytes.
44 *
45 * (As in the GNAME() definitions above, as of sbcl-0.8.10, this seems
46 * no longer to be much of an issue, since everyone has converged on
47 * the same value. If this generality really turns out not to
48 * matter any more, perhaps it's just clutter we could get
49 * rid of? -- WHN 2004-04-18)
50 */
51 #if defined(__linux__) || defined(LISP_FEATURE_FREEBSD) || defined(__NetBSD__) || defined(__OpenBSD__) || \
52 defined(__sun) || defined(LISP_FEATURE_WIN32) || defined(__DragonFly__)
53 #define align_4byte 4
54 #define align_8byte 8
55 #define align_16byte 16
56 #define align_page 4096
57 #else
58 #define align_4byte 2
59 #define align_8byte 3
60 #define align_16byte 4
61 #define align_page 12
62 #endif
64 /*
65 * The assembler used for win32 doesn't like .type or .size directives,
66 * so we want to conditionally kill them out. So let's wrap them in macros
67 * that are defined to be no-ops on win32. Hopefully this still works on
68 * other platforms.
69 */
70 #if !defined(LISP_FEATURE_WIN32) && !defined(LISP_FEATURE_DARWIN)
71 #define TYPE(name) .type name,@function
72 #define SIZE(name) .size name,.-name
73 #else
74 #define TYPE(name)
75 #define SIZE(name)
76 #endif
78 /* Helper macros for access to thread-locals slots for both OS types:
79 * ------------------------------------------------------------------------
80 *
81 * Windows TEB block
82 * ================== __________
83 * | Win32 %FS base | ----> | | 0
84 * ================== | | 1
85 * z z
86 * TLS slots start here> |XXXXXXXX| e10 = TEB_STATIC_TLS_SLOTS_OFFSET
87 * |XXXXXXXX| e11
88 * z ... z
89 * |XXXXXXXX| e4e
90 * TLS ends here> ,- |XXXXXXXX| e4f = TEB_STATIC_TLS_SLOTS_OFFSET+63
91 * / z z
92 * | ---------- "os_address" ----.
93 * | |
94 * | big blob of SBCL-specific thread-local data |
95 * | |----------------------------------------| <--'
96 * | | CONTROL, BINDING, ALIEN STACK |
97 * | z z
98 * ================== | |----------------------------------------|
99 * | Linux %FS base | -->| | FFI stack pointer |
100 * ================== | | (extra page for mprotect) |
101 * \ |----------------------------------------|
102 * (union p_t_d) -----> \-> | struct thread { | dynamic_values[0] |
103 * . | ... | [1] |
104 * . z ... z ... z
105 * [tls data begins] | } | ... | <-
106 * [declared end of p_t_d] |----------------------------------------| . |
107 * . | ... | . |
108 * . | [TLS_SIZE-1] | <-|
109 * [tls data actually ends] |----------------------------------------| |
110 * . | ALTSTACK | |
111 * . |----------------------------------------| |
112 * . | struct nonpointer_thread_data { } | |
113 * . ------------------------------------------ |
114 * [blob actually ends] |
115 * /
116 * /
117 * /
118 * ______________________ /
119 * | struct symbol { | /
120 * z ... z /
121 * | fixnum tls_index; // fixnum value relative to union /
122 * | } | (< TLS_SIZE = 4096)
123 * ---------------------|
124 */
125 #ifdef LISP_FEATURE_WIN32
126 # define TEB_STATIC_TLS_SLOTS_OFFSET 0xE10
127 # define TEB_SBCL_THREAD_BASE_OFFSET (TEB_STATIC_TLS_SLOTS_OFFSET+(63*4))
128 # define SBCL_THREAD_BASE_EA %fs:TEB_SBCL_THREAD_BASE_OFFSET
129 # define MAYBE_FS(addr) addr
130 # define LoadTlSymbolValueAddress(symbol,reg) ; \
131 movl SBCL_THREAD_BASE_EA, reg ; \
132 addl (symbol+SYMBOL_TLS_INDEX_OFFSET), reg ;
133 # define LoadCurrentThreadSlot(offset,reg); \
134 movl SBCL_THREAD_BASE_EA, reg ; \
135 movl offset(reg), reg ;
136 #elif defined(LISP_FEATURE_LINUX) || defined(LISP_FEATURE_SUNOS) || defined(LISP_FEATURE_FREEBSD) || \
137 defined(LISP_FEATURE_DRAGONFLY)
138 /* %fs:0 refers to the current thread. Useful! Less usefully,
139 * Linux/x86 isn't capable of reporting a faulting si_addr on a
140 * segment as defined above (whereas faults on the segment that %gs
141 * usually points are reported just fine...).
142 * But we have the thread's address stored in the THIS slot,
143 * so that within the thread
144 * movl %fs:THIS_OFFSET,x
145 * stores the absolute address of %fs:0 into x.
146 */
147 # define SBCL_THREAD_BASE_EA %fs:THREAD_THIS_OFFSET
148 # define MAYBE_FS(addr) addr
149 #else
150 /* perhaps there's an OS out there that actually supports %fs without
151 * jumping through hoops, so just in case, here a default definition: */
152 # define SBCL_THREAD_BASE_EA $0
153 # define MAYBE_FS(addr) %fs:addr
154 #endif
156 /* gas can't parse 4096LU; redefine */
157 #if BACKEND_PAGE_BYTES == 4096
158 # undef BACKEND_PAGE_BYTES
159 # define BACKEND_PAGE_BYTES 4096
160 #elif BACKEND_PAGE_BYTES == 32768
161 # undef BACKEND_PAGE_BYTES
162 # define BACKEND_PAGE_BYTES 32768
163 #else
164 # error BACKEND_PAGE_BYTES mismatch
165 #endif
167 /* OAOOM because we don't have the C headers here */
168 #define THREAD_CSP_PAGE_SIZE BACKEND_PAGE_BYTES
170 /* the CSP page sits right before the thread */
171 #define THREAD_SAVED_CSP_OFFSET (-THREAD_CSP_PAGE_SIZE)
173 /*
174 * x86/darwin (as of MacOS X 10.4.5) doesn't reliably file signal
175 * handlers (SIGTRAP or Mach exception handlers) for 0xCC, wo we have
176 * to use ud2 instead. ud2 is an undefined opcode, #x0b0f, or
177 * 0F 0B in low-endian notation, that causes SIGILL to fire. We check
178 * for this instruction in the SIGILL handler and if we see it, we
179 * advance the EIP by two bytes to skip over ud2 instruction and
180 * call sigtrap_handler. */
181 #if defined(LISP_FEATURE_UD2_BREAKPOINTS)
182 #define TRAP ud2
183 #else
184 #define TRAP int3
185 #endif
187 .text
188 .globl GNAME(all_threads)
189 \f
190 /*
191 * A call to call_into_c preserves esi, edi, and ebp.
192 * (The C function will preserve ebx, esi, edi, and ebp across its
193 * function call, but we trash ebx ourselves by using it to save the
194 * return Lisp address.)
195 *
196 * Return values are in eax and maybe edx for quads, or st(0) for
197 * floats.
198 *
199 * This should work for Lisp calls C calls Lisp calls C..
200 *
201 * FIXME & OAOOM: This duplicates call-out in src/compiler/x86/c-call.lisp,
202 * so if you tweak this, change that too!
203 */
204 /*
205 * Note on sections specific to LISP_FEATURE_SB_SAFEPOINT:
206 *
207 * The code below is essential to safepoint-based garbage collection,
208 * and several details need to be considered for correct implementation.
209 *
210 * The stack spilling approach:
211 * On SB-SAFEPOINT platforms, the CALL-OUT vop is defined to spill all
212 * live Lisp TNs to the stack to provide information for conservative
213 * GC cooperatively (avoiding the need to retrieve register values
214 * from POSIX signal contexts or Windows GetThreadContext()).
215 *
216 * Finding the SP at all:
217 * The main remaining value needed by GC is the stack pointer (SP) at
218 * the moment of entering the foreign function. For this purpose, a
219 * thread-local field for the SP is used. Two stores to that field
220 * are done for each C call, one to save the SP before calling out and
221 * and one to undo that store afterwards.
222 *
223 * Stores as synchronization points:
224 * These two stores delimit the C call: While the SP is set, our
225 * thread is known not to run Lisp code: During GC, memory protection
226 * ensures that no thread proceeds across stores.
227 *
228 * The return PC issue:
229 * (Note that CALL-OUT has, in principle, two versions: Inline
230 * assembly in the VOP -or- alternatively the out-of-line version you
231 * are currently reading. In reality, safepoint builds currently
232 * lack the inline code entirely.)
233 *
234 * Both versions need to take special care with the return PC:
235 * - In the inline version of the code (if it existed), the two stores
236 * would be done directly in the CALL-OUT vop. In that theoretical
237 * implementation, there is a time interval between return of the
238 * actual C call and a second SP store during which the return
239 * address might not be on the stack anymore.
240 * - In this out-of-line version, the stores are done during
241 * call_into_c's frame, but an equivalent problem arises: In order
242 * to present the stack of arguments as our foreign function expects
243 * them, call_into_c has to pop the Lisp return address into a
244 * register first; this register has to be preserved by GENCGC
245 * separately: our return address is not in the stack anymore.
246 * In both case, stack scanning alone is not sufficient to pin
247 * the return address, and we communicate it to GC explicitly
248 * in addition to the SP.
249 *
250 * Note on look-alike accessor macros with vastly different behaviour:
251 * THREAD_PC_AROUND_FOREIGN_CALL_OFFSET is an "ordinary" field of the
252 * struct thread, whereas THREAD_SAVED_CSP_OFFSET is a synchronization
253 * point on a potentially write-protected page.
254 */
256 .text
257 .align align_16byte,0x90
258 .globl GNAME(call_into_c)
259 TYPE(GNAME(call_into_c))
260 GNAME(call_into_c):
261 /* Save the return Lisp address in ebx. */
262 popl %ebx
264 /* Setup the NPX for C */
265 /* The VOP says regarding CLD: "Clear out DF: Darwin, Windows,
266 * and Solaris at least require this, and it should not hurt
267 * others either." call_into_c didn't have it, but better safe than
268 * sorry. */
269 cld
270 fstp %st(0)
271 fstp %st(0)
272 fstp %st(0)
273 fstp %st(0)
274 fstp %st(0)
275 fstp %st(0)
276 fstp %st(0)
277 fstp %st(0)
279 #ifdef LISP_FEATURE_SB_SAFEPOINT
280 /* enter safe region: store SP and return PC */
281 movl SBCL_THREAD_BASE_EA,%edi
282 movl %esp,MAYBE_FS(THREAD_SAVED_CSP_OFFSET(%edi))
283 movl %ebx,MAYBE_FS(THREAD_PC_AROUND_FOREIGN_CALL_OFFSET(%edi))
284 #endif
286 /* foreign call, preserving ESI, EDI, and EBX */
287 call *%eax # normal callout using Lisp stack
288 /* return values now in eax/edx OR st(0) */
290 #ifdef LISP_FEATURE_SB_SAFEPOINT
291 /* leave region: clear the SP! (Also unpin the return PC.) */
292 xorl %ecx,%ecx
293 movl %ecx,MAYBE_FS(THREAD_SAVED_CSP_OFFSET(%edi))
294 movl %ecx,MAYBE_FS(THREAD_PC_AROUND_FOREIGN_CALL_OFFSET(%edi))
295 #endif
297 movl %eax,%ecx # remember integer return value
299 /* Check for a return FP value. */
300 fxam
301 fnstsw %ax
302 andl $0x4500,%eax
303 cmpl $0x4100,%eax
304 jne Lfp_rtn_value
306 /* The return value is in eax, or eax,edx? */
307 /* Set up the NPX stack for Lisp. */
308 fldz # Ensure no regs are empty.
309 fldz
310 fldz
311 fldz
312 fldz
313 fldz
314 fldz
315 fldz
317 /* Restore the return value. */
318 movl %ecx,%eax # maybe return value
320 /* Return. */
321 jmp *%ebx
323 Lfp_rtn_value:
324 /* The return result is in st(0). */
325 /* Set up the NPX stack for Lisp, placing the result in st(0). */
326 fldz # Ensure no regs are empty.
327 fldz
328 fldz
329 fldz
330 fldz
331 fldz
332 fldz
333 fxch %st(7) # Move the result back to st(0).
335 /* We don't need to restore eax, because the result is in st(0). */
337 /* Return. FIXME: It would be nice to restructure this to use RET. */
338 jmp *%ebx
340 SIZE(GNAME(call_into_c))
342 \f
343 .text
344 .globl GNAME(call_into_lisp_first_time)
345 TYPE(GNAME(call_into_lisp_first_time))
347 /* We don't worry too much about saving registers
348 * here, because we never expect to return from the initial call to lisp
349 * anyway */
351 .align align_16byte,0x90
352 GNAME(call_into_lisp_first_time):
353 pushl %ebp # Save old frame pointer.
354 movl %esp,%ebp # Establish new frame.
355 #ifndef LISP_FEATURE_WIN32
356 movl GNAME(all_threads),%eax
357 /* pthread machinery takes care of this for other threads */
358 movl THREAD_CONTROL_STACK_END_OFFSET(%eax) ,%esp
359 #else
360 /* Win32 -really- doesn't like you switching stacks out from under it. */
361 movl GNAME(all_threads),%eax
362 #endif
363 jmp Lstack
364 \f
365 .text
366 .globl GNAME(call_into_lisp)
367 TYPE(GNAME(call_into_lisp))
369 /* The C conventions require that ebx, esi, edi, and ebp be preserved
370 * across function calls. */
372 .align align_16byte,0x90
373 GNAME(call_into_lisp):
374 pushl %ebp # Save old frame pointer.
375 movl %esp,%ebp # Establish new frame.
377 Lstack:
378 /* Save the NPX state */
379 fwait # Catch any pending NPX exceptions.
380 subl $108,%esp # Make room for the NPX state.
381 fnsave (%esp) # save and reset NPX
383 movl (%esp),%eax # Load NPX control word.
384 andl $0xfffff2ff,%eax # Set rounding mode to nearest.
385 orl $0x00000200,%eax # Set precision to 64 bits. (53-bit mantissa)
386 pushl %eax
387 fldcw (%esp) # Recover modes.
388 popl %eax
390 fldz # Ensure no FP regs are empty.
391 fldz
392 fldz
393 fldz
394 fldz
395 fldz
396 fldz
397 fldz
399 /* Save C regs: ebx esi edi. */
400 pushl %ebx
401 pushl %esi
402 pushl %edi
404 /* Clear descriptor regs. */
405 xorl %eax,%eax # lexenv
406 xorl %ebx,%ebx # available
407 xorl %ecx,%ecx # arg count
408 xorl %edx,%edx # first arg
409 xorl %edi,%edi # second arg
410 xorl %esi,%esi # third arg
412 /* no longer in function call */
413 movl %esp,%ebx # remember current stack
414 pushl %ebx # Save entry stack on (maybe) new stack.
416 /* Establish Lisp args. */
417 movl 8(%ebp),%eax # lexenv?
418 movl 12(%ebp),%ebx # address of arg vec
419 movl 16(%ebp),%ecx # num args
420 shll $2,%ecx # Make num args into fixnum.
421 cmpl $0,%ecx
422 je Ldone
423 movl (%ebx),%edx # arg0
424 cmpl $4,%ecx
425 je Ldone
426 movl 4(%ebx),%edi # arg1
427 cmpl $8,%ecx
428 je Ldone
429 movl 8(%ebx),%esi # arg2
430 Ldone:
431 /* Registers eax, ecx, edx, edi, and esi are now live. */
433 #ifdef LISP_FEATURE_WIN32
434 /* Establish an SEH frame. */
435 #ifdef LISP_FEATURE_SB_THREAD
436 /* Save binding stack pointer */
437 subl $4, %esp
438 pushl %eax
439 movl SBCL_THREAD_BASE_EA, %eax
440 movl THREAD_BINDING_STACK_POINTER_OFFSET(%eax), %eax
441 movl %eax, 4(%esp)
442 popl %eax
443 #else
444 pushl BINDING_STACK_POINTER + SYMBOL_VALUE_OFFSET
445 #endif
446 pushl $GNAME(exception_handler_wrapper)
447 pushl %fs:0
448 movl %esp, %fs:0
449 #endif
451 /* Alloc new frame. */
452 push %ebp # Dummy for return address
453 push %ebp # fp in save location S1
454 mov %esp,%ebp # The current sp marks start of new frame.
455 sub $4,%esp # Ensure 3 slots are allocated, two above.
457 call *CLOSURE_FUN_OFFSET(%eax)
459 /* If the function returned multiple values, it will return to
460 this point. Lose them */
461 jnc LsingleValue
462 mov %ebx, %esp
463 LsingleValue:
464 /* A singled value function returns here */
466 #ifdef LISP_FEATURE_WIN32
467 /* Remove our SEH frame. */
468 mov %fs:0,%esp
469 popl %fs:0
470 add $8, %esp
471 #endif
473 /* Restore the stack, in case there was a stack change. */
474 popl %esp # c-sp
476 /* Restore C regs: ebx esi edi. */
477 popl %edi
478 popl %esi
479 popl %ebx
481 /* Restore the NPX state. */
482 frstor (%esp)
483 addl $108, %esp
485 popl %ebp # c-sp
486 movl %edx,%eax # c-val
487 ret
488 SIZE(GNAME(call_into_lisp))
489 \f
490 /* support for saving and restoring the NPX state from C */
491 .text
492 .globl GNAME(fpu_save)
493 TYPE(GNAME(fpu_save))
494 .align 2,0x90
495 GNAME(fpu_save):
496 movl 4(%esp),%eax
497 fnsave (%eax) # Save the NPX state. (resets NPX)
498 ret
499 SIZE(GNAME(fpu_save))
501 .globl GNAME(fpu_restore)
502 TYPE(GNAME(fpu_restore))
503 .align 2,0x90
504 GNAME(fpu_restore):
505 movl 4(%esp),%eax
506 frstor (%eax) # Restore the NPX state.
507 ret
508 SIZE(GNAME(fpu_restore))
509 \f
510 /*
511 * fun-end breakpoint magic
512 */
514 /*
515 * For an explanation of the magic involved in function-end
516 * breakpoints, see the implementation in ppc-assem.S.
517 */
519 .text
520 .globl GNAME(fun_end_breakpoint_guts)
521 .align align_16byte
522 GNAME(fun_end_breakpoint_guts):
523 /* Multiple Value return */
524 jc multiple_value_return
525 /* Single value return: The eventual return will now use the
526 multiple values return convention but with a return values
527 count of one. */
528 movl %esp,%ebx # Setup ebx - the ofp.
529 subl $4,%esp # Allocate one stack slot for the return value
530 movl $(1 << N_FIXNUM_TAG_BITS),%ecx # Setup ecx for one return value.
531 movl $(NIL),%edi # default second value
532 movl $(NIL),%esi # default third value
534 multiple_value_return:
536 .globl GNAME(fun_end_breakpoint_trap)
537 GNAME(fun_end_breakpoint_trap):
538 TRAP
539 .byte trap_FunEndBreakpoint
540 hlt # We should never return here.
542 .globl GNAME(fun_end_breakpoint_end)
543 GNAME(fun_end_breakpoint_end):
545 \f
546 .globl GNAME(do_pending_interrupt)
547 TYPE(GNAME(do_pending_interrupt))
548 .align align_16byte,0x90
549 GNAME(do_pending_interrupt):
550 TRAP
551 .byte trap_PendingInterrupt
552 ret
553 SIZE(GNAME(do_pending_interrupt))
554 \f
555 /* Allocate bytes and return the start of the allocated space
556 * in the specified destination register.
557 *
558 * In the general case the size will be in the destination register.
559 *
560 * All registers must be preserved except the destination.
561 * The C conventions will preserve ebx, esi, edi, and ebp.
562 * So only eax, ecx, and edx need special care here.
563 *
564 * ALLOC factors out the logic of calling alloc(): stack alignment, etc.
565 *
566 * DEFINE_ALLOC_TO_FOO defines an alloction routine.
567 */
569 #ifdef LISP_FEATURE_DARWIN
570 #define ALLOC(size) \
571 pushl %ebp; /* Save EBP */ \
572 movl %esp,%ebp; /* Save ESP to EBP */ \
573 pushl $0; /* Reserve space for arg */ \
574 andl $0xfffffff0,%esp; /* Align stack to 16bytes */ \
575 movl size, (%esp); /* Argument to alloc */ \
576 call GNAME(alloc); \
577 movl %ebp,%esp; /* Restore ESP from EBP */ \
578 popl %ebp; /* Restore EBP */
579 #else
580 #define ALLOC(size) \
581 pushl size; /* Argument to alloc */ \
582 call GNAME(alloc); \
583 addl $4,%esp; /* Pop argument */
584 #endif
586 #define DEFINE_ALLOC_TO_EAX(name,size) \
587 .globl GNAME(name); \
588 TYPE(GNAME(name)); \
589 .align align_16byte,0x90; \
590 GNAME(name): \
591 pushl %ecx; /* Save ECX and EDX */ \
592 pushl %edx; \
593 ALLOC(size) \
594 popl %edx; /* Restore ECX and EDX */ \
595 popl %ecx; \
596 ret; \
597 SIZE(GNAME(name))
599 #define DEFINE_ALLOC_TO_ECX(name,size) \
600 .globl GNAME(name); \
601 TYPE(GNAME(name)); \
602 .align align_16byte,0x90; \
603 GNAME(name): \
604 pushl %eax; /* Save EAX and EDX */ \
605 pushl %edx; \
606 ALLOC(size) \
607 movl %eax,%ecx; /* Result to destination */ \
608 popl %edx; \
609 popl %eax; \
610 ret; \
611 SIZE(GNAME(name))
613 #define DEFINE_ALLOC_TO_EDX(name,size) \
614 .globl GNAME(name); \
615 TYPE(GNAME(name)); \
616 .align align_16byte,0x90; \
617 GNAME(name): \
618 pushl %eax; /* Save EAX and ECX */ \
619 pushl %ecx; \
620 ALLOC(size) \
621 movl %eax,%edx; /* Restore EAX and ECX */ \
622 popl %ecx; \
623 popl %eax; \
624 ret; \
625 SIZE(GNAME(name))
627 #define DEFINE_ALLOC_TO_REG(name,reg,size) \
628 .globl GNAME(name); \
629 TYPE(GNAME(name)); \
630 .align align_16byte,0x90; \
631 GNAME(name): \
632 pushl %eax; /* Save EAX, ECX, and EDX */ \
633 pushl %ecx; \
634 pushl %edx; \
635 ALLOC(size) \
636 movl %eax,reg; /* Restore them */ \
637 popl %edx; \
638 popl %ecx; \
639 popl %eax; \
640 ret; \
641 SIZE(GNAME(name))
643 DEFINE_ALLOC_TO_EAX(alloc_to_eax,%eax)
644 DEFINE_ALLOC_TO_EAX(alloc_8_to_eax,$8)
645 DEFINE_ALLOC_TO_EAX(alloc_16_to_eax,$16)
647 DEFINE_ALLOC_TO_ECX(alloc_to_ecx,%ecx)
648 DEFINE_ALLOC_TO_ECX(alloc_8_to_ecx,$8)
649 DEFINE_ALLOC_TO_ECX(alloc_16_to_ecx,$16)
651 DEFINE_ALLOC_TO_EDX(alloc_to_edx,%edx)
652 DEFINE_ALLOC_TO_EDX(alloc_8_to_edx,$8)
653 DEFINE_ALLOC_TO_EDX(alloc_16_to_edx,$16)
655 DEFINE_ALLOC_TO_REG(alloc_to_ebx,%ebx,%ebx)
656 DEFINE_ALLOC_TO_REG(alloc_8_to_ebx,%ebx,$8)
657 DEFINE_ALLOC_TO_REG(alloc_16_to_ebx,%ebx,$16)
659 DEFINE_ALLOC_TO_REG(alloc_to_esi,%esi,%esi)
660 DEFINE_ALLOC_TO_REG(alloc_8_to_esi,%esi,$8)
661 DEFINE_ALLOC_TO_REG(alloc_16_to_esi,%esi,$16)
663 DEFINE_ALLOC_TO_REG(alloc_to_edi,%edi,%edi)
664 DEFINE_ALLOC_TO_REG(alloc_8_to_edi,%edi,$8)
665 DEFINE_ALLOC_TO_REG(alloc_16_to_edi,%edi,$16)
667 /* Called from lisp when an inline allocation overflows.
668 * Every register except the result needs to be preserved.
669 * We depend on C to preserve ebx, esi, edi, and ebp.
670 * But where necessary must save eax, ecx, edx. */
672 #ifdef LISP_FEATURE_SB_THREAD
673 #define START_REGION %fs:THREAD_ALLOC_REGION_OFFSET
674 #else
675 #define START_REGION GNAME(boxed_region)
676 #endif
678 #if defined(LISP_FEATURE_SB_THREAD) && defined(LISP_FEATURE_WIN32)
679 #define ALLOC_OVERFLOW(size,scratch) \
680 movl SBCL_THREAD_BASE_EA, scratch; \
681 /* Calculate the size for the allocation. */ \
682 subl THREAD_ALLOC_REGION_OFFSET(scratch),size; \
683 ALLOC(size)
684 #else
685 #define ALLOC_OVERFLOW(size,scratch) \
686 /* Calculate the size for the allocation. */ \
687 subl START_REGION,size; \
688 ALLOC(size)
689 #endif
691 /* This routine handles an overflow with eax=crfp+size. So the
692 size=eax-crfp. */
693 .align align_16byte
694 .globl GNAME(alloc_overflow_eax)
695 TYPE(GNAME(alloc_overflow_eax))
696 GNAME(alloc_overflow_eax):
697 pushl %ecx # Save ecx
698 pushl %edx # Save edx
699 ALLOC_OVERFLOW(%eax,%edx)
700 popl %edx # Restore edx.
701 popl %ecx # Restore ecx.
702 ret
703 SIZE(GNAME(alloc_overflow_eax))
705 .align align_16byte
706 .globl GNAME(alloc_overflow_ecx)
707 TYPE(GNAME(alloc_overflow_ecx))
708 GNAME(alloc_overflow_ecx):
709 pushl %eax # Save eax
710 pushl %edx # Save edx
711 ALLOC_OVERFLOW(%ecx,%edx)
712 movl %eax,%ecx # setup the destination.
713 popl %edx # Restore edx.
714 popl %eax # Restore eax.
715 ret
716 SIZE(GNAME(alloc_overflow_ecx))
718 .align align_16byte
719 .globl GNAME(alloc_overflow_edx)
720 TYPE(GNAME(alloc_overflow_edx))
721 GNAME(alloc_overflow_edx):
722 pushl %eax # Save eax
723 pushl %ecx # Save ecx
724 ALLOC_OVERFLOW(%edx,%ecx)
725 movl %eax,%edx # setup the destination.
726 popl %ecx # Restore ecx.
727 popl %eax # Restore eax.
728 ret
729 SIZE(GNAME(alloc_overflow_edx))
731 /* This routine handles an overflow with ebx=crfp+size. So the
732 size=ebx-crfp. */
733 .align align_16byte
734 .globl GNAME(alloc_overflow_ebx)
735 TYPE(GNAME(alloc_overflow_ebx))
736 GNAME(alloc_overflow_ebx):
737 pushl %eax # Save eax
738 pushl %ecx # Save ecx
739 pushl %edx # Save edx
740 ALLOC_OVERFLOW(%ebx,%edx)
741 movl %eax,%ebx # setup the destination.
742 popl %edx # Restore edx.
743 popl %ecx # Restore ecx.
744 popl %eax # Restore eax.
745 ret
746 SIZE(GNAME(alloc_overflow_ebx))
748 /* This routine handles an overflow with esi=crfp+size. So the
749 size=esi-crfp. */
750 .align align_16byte
751 .globl GNAME(alloc_overflow_esi)
752 TYPE(GNAME(alloc_overflow_esi))
753 GNAME(alloc_overflow_esi):
754 pushl %eax # Save eax
755 pushl %ecx # Save ecx
756 pushl %edx # Save edx
757 ALLOC_OVERFLOW(%esi,%edx)
758 movl %eax,%esi # setup the destination.
759 popl %edx # Restore edx.
760 popl %ecx # Restore ecx.
761 popl %eax # Restore eax.
762 ret
763 SIZE(GNAME(alloc_overflow_esi))
765 .align align_16byte
766 .globl GNAME(alloc_overflow_edi)
767 TYPE(GNAME(alloc_overflow_edi))
768 GNAME(alloc_overflow_edi):
769 pushl %eax # Save eax
770 pushl %ecx # Save ecx
771 pushl %edx # Save edx
772 ALLOC_OVERFLOW(%edi,%edx)
773 movl %eax,%edi # setup the destination.
774 popl %edx # Restore edx.
775 popl %ecx # Restore ecx.
776 popl %eax # Restore eax.
777 ret
778 SIZE(GNAME(alloc_overflow_edi))
781 #ifdef LISP_FEATURE_WIN32
782 /* The guts of the exception-handling system doesn't use
783 * frame pointers, which manages to throw off backtraces
784 * rather badly. So here we grab the (known-good) EBP
785 * and EIP from the exception context and use it to fake
786 * up a stack frame which will skip over the system SEH
787 * code. */
788 .align align_16byte
789 .globl GNAME(exception_handler_wrapper)
790 TYPE(GNAME(exception_handler_wrapper))
791 GNAME(exception_handler_wrapper):
792 /* Context layout is: */
793 /* 7 dwords before FSA. (0x1c) */
794 /* 8 dwords and 0x50 bytes in the FSA. (0x70/0x8c) */
795 /* 4 dwords segregs. (0x10/0x9c) */
796 /* 6 dwords non-stack GPRs. (0x18/0xb4) */
797 /* EBP (at 0xb4) */
798 /* EIP (at 0xb8) */
799 #define CONTEXT_EBP_OFFSET 0xb4
800 #define CONTEXT_EIP_OFFSET 0xb8
801 /* some other stuff we don't care about. */
802 pushl %ebp
803 movl 0x10(%esp), %ebp /* context */
804 pushl CONTEXT_EIP_OFFSET(%ebp)
805 pushl CONTEXT_EBP_OFFSET(%ebp)
806 movl %esp, %ebp
807 pushl 0x1c(%esp)
808 pushl 0x1c(%esp)
809 pushl 0x1c(%esp)
810 pushl 0x1c(%esp)
811 call GNAME(handle_exception)
812 lea 8(%ebp), %esp
813 popl %ebp
814 ret
815 SIZE(GNAME(exception_handler_wrapper))
816 #endif
818 #ifdef LISP_FEATURE_DARWIN
819 .align align_16byte
820 .globl GNAME(call_into_lisp_tramp)
821 TYPE(GNAME(call_into_lisp_tramp))
822 GNAME(call_into_lisp_tramp):
823 /* 1. build the stack frame from the block that's pointed to by ECX
824 2. free the block
825 3. set ECX to 0
826 4. call the function via call_into_lisp
827 */
828 pushl 0(%ecx) /* return address */
830 pushl %ebp
831 movl %esp, %ebp
833 pushl 32(%ecx) /* eflags */
834 pushl 28(%ecx) /* EAX */
835 pushl 20(%ecx) /* ECX */
836 pushl 16(%ecx) /* EDX */
837 pushl 24(%ecx) /* EBX */
838 pushl $0 /* popal is going to ignore esp */
839 pushl %ebp /* is this right?? */
840 pushl 12(%ecx) /* ESI */
841 pushl 8(%ecx) /* EDI */
842 pushl $0 /* args for call_into_lisp */
843 pushl $0
844 pushl 4(%ecx) /* function to call */
846 /* free our save block */
847 pushl %ecx /* reserve sufficient space on stack for args */
848 pushl %ecx
849 andl $0xfffffff0, %esp /* align stack */
850 movl $0x40, 4(%esp)
851 movl %ecx, (%esp)
852 call GNAME(os_invalidate)
854 /* call call_into_lisp */
855 leal -48(%ebp), %esp
856 call GNAME(call_into_lisp)
858 /* Clean up our mess */
859 leal -36(%ebp), %esp
860 popal
861 popfl
862 leave
863 ret
865 SIZE(call_into_lisp_tramp)
866 #endif
868 .align align_16byte,0x90
869 .globl GNAME(post_signal_tramp)
870 TYPE(GNAME(post_signal_tramp))
871 GNAME(post_signal_tramp):
872 /* this is notionally the second half of a function whose first half
873 * doesn't exist. This is where call_into_lisp returns when called
874 * using return_to_lisp_function */
875 addl $12,%esp /* clear call_into_lisp args from stack */
876 popal /* restore registers */
877 popfl
878 #ifdef LISP_FEATURE_DARWIN
879 /* skip two padding words */
880 addl $8,%esp
881 #endif
882 leave
883 ret
884 SIZE(GNAME(post_signal_tramp))
887 /* fast_bzero implementations and code to detect which implementation
888 * to use.
889 */
890 \f
891 .globl GNAME(fast_bzero_pointer)
892 .data
893 .align align_16byte
894 GNAME(fast_bzero_pointer):
895 /* Variable containing a pointer to the bzero function to use.
896 * Initially points to a basic function. Change this variable
897 * to fast_bzero_detect if OS supports SSE. */
898 .long GNAME(fast_bzero_base)
899 \f
900 .text
901 .align align_16byte,0x90
902 .globl GNAME(fast_bzero)
903 TYPE(GNAME(fast_bzero))
904 GNAME(fast_bzero):
905 /* Indirect function call */
906 jmp *GNAME(fast_bzero_pointer)
907 SIZE(GNAME(fast_bzero))
909 \f
910 .text
911 .align align_16byte,0x90
912 .globl GNAME(fast_bzero_detect)
913 TYPE(GNAME(fast_bzero_detect))
914 GNAME(fast_bzero_detect):
915 /* Decide whether to use SSE, MMX or REP version */
916 push %eax /* CPUID uses EAX-EDX */
917 push %ebx
918 push %ecx
919 push %edx
920 mov $1, %eax
921 cpuid
922 test $0x04000000, %edx /* SSE2 needed for MOVNTDQ */
923 jnz Lsse2
924 /* Originally there was another case here for using the
925 * MOVNTQ instruction for processors that supported MMX but
926 * not SSE2. This turned out to be a loss especially on
927 * Athlons (where this instruction is apparently microcoded
928 * somewhat slowly). So for simplicity revert to REP STOSL
929 * for all non-SSE2 processors.
930 */
931 Lbase:
932 movl $(GNAME(fast_bzero_base)), GNAME(fast_bzero_pointer)
933 jmp Lrestore
934 Lsse2:
935 movl $(GNAME(fast_bzero_sse)), GNAME(fast_bzero_pointer)
936 jmp Lrestore
938 Lrestore:
939 pop %edx
940 pop %ecx
941 pop %ebx
942 pop %eax
943 jmp *GNAME(fast_bzero_pointer)
945 SIZE(GNAME(fast_bzero_detect))
947 \f
948 .text
949 .align align_16byte,0x90
950 .globl GNAME(fast_bzero_sse)
951 TYPE(GNAME(fast_bzero_sse))
953 GNAME(fast_bzero_sse):
954 /* A fast routine for zero-filling blocks of memory that are
955 * guaranteed to start and end at a 4096-byte aligned address.
956 */
957 push %esi /* Save temporary registers */
958 push %edi
959 mov 16(%esp), %esi /* Parameter: amount of bytes to fill */
960 mov 12(%esp), %edi /* Parameter: start address */
961 shr $6, %esi /* Amount of 64-byte blocks to copy */
962 jz Lend_sse /* If none, stop */
963 movups %xmm7, -16(%esp) /* Save XMM register */
964 xorps %xmm7, %xmm7 /* Zero the XMM register */
965 jmp Lloop_sse
966 .align align_16byte
967 Lloop_sse:
969 /* Copy the 16 zeroes from xmm7 to memory, 4 times. MOVNTDQ is the
970 * non-caching double-quadword moving variant, i.e. the memory areas
971 * we're touching are not fetched into the L1 cache, since we're just
972 * going to overwrite the memory soon anyway.
973 */
974 movntdq %xmm7, 0(%edi)
975 movntdq %xmm7, 16(%edi)
976 movntdq %xmm7, 32(%edi)
977 movntdq %xmm7, 48(%edi)
979 add $64, %edi /* Advance pointer */
980 dec %esi /* Decrement 64-byte block count */
981 jnz Lloop_sse
982 movups -16(%esp), %xmm7 /* Restore the XMM register */
983 sfence /* Ensure that weakly ordered writes are flushed. */
984 Lend_sse:
985 mov 12(%esp), %esi /* Parameter: start address */
986 prefetcht0 0(%esi) /* Prefetch the start of the block into cache,
987 * since it's likely to be used immediately. */
988 pop %edi /* Restore temp registers */
989 pop %esi
990 ret
991 SIZE(GNAME(fast_bzero_sse))
993 \f
994 .text
995 .align align_16byte,0x90
996 .globl GNAME(fast_bzero_base)
997 TYPE(GNAME(fast_bzero_base))
999 GNAME(fast_bzero_base):
1000 /* A fast routine for zero-filling blocks of memory that are
1001 * guaranteed to start and end at a 4096-byte aligned address.
1002 */
1003 push %eax /* Save temporary registers */
1004 push %ecx
1005 push %edi
1006 mov 20(%esp), %ecx /* Parameter: amount of bytes to fill */
1007 mov 16(%esp), %edi /* Parameter: start address */
1008 xor %eax, %eax /* Zero EAX */
1009 shr $2, %ecx /* Amount of 4-byte blocks to copy */
1010 jz Lend_base
1012 rep
1013 stosl /* Store EAX to *EDI, ECX times, incrementing
1014 * EDI by 4 after each store */
1016 Lend_base:
1017 pop %edi /* Restore temp registers */
1018 pop %ecx
1019 pop %eax
1020 ret
1021 SIZE(GNAME(fast_bzero_base))
1023 \f
1024 /* When LISP_FEATURE_C_STACK_IS_CONTROL_STACK, we cannot safely scrub
1025 * the control stack from C, largely due to not knowing where the
1026 * active stack frame ends. On such platforms, we reimplement the
1027 * core scrubbing logic in assembly, in this case here:
1028 */
1029 .text
1030 .align align_16byte,0x90
1031 .globl GNAME(arch_scrub_control_stack)
1032 TYPE(GNAME(arch_scrub_control_stack))
1033 GNAME(arch_scrub_control_stack):
1034 /* We are passed three parameters:
1035 * A (struct thread *) at [ESP+4],
1036 * the address of the guard page at [ESP+8], and
1037 * the address of the hard guard page at [ESP+12].
1038 * We may trash EAX, ECX, and EDX with impunity.
1039 * [ESP] is our return address, [ESP-4] is the first
1040 * stack slot to scrub. */
1042 /* We start by setting up our scrub pointer in EAX, our
1043 * guard page upper bound in ECX, and our hard guard
1044 * page upper bound in EDX. */
1045 lea -4(%esp), %eax
1046 mov GNAME(os_vm_page_size),%edx
1047 mov %edx, %ecx
1048 add 8(%esp), %ecx
1049 add 12(%esp), %edx
1051 /* We need to do a memory operation relative to the
1052 * thread pointer, so put it in %ecx and our guard
1053 * page upper bound in 4(%esp). */
1054 xchg 4(%esp), %ecx
1056 /* Now we begin our main scrub loop. */
1057 ascs_outer_loop:
1059 /* If we're about to scrub the hard guard page, exit. */
1060 cmp %edx, %eax
1061 jae ascs_check_guard_page
1062 cmp 12(%esp), %eax
1063 ja ascs_finished
1065 ascs_check_guard_page:
1066 /* If we're about to scrub the guard page, and the guard
1067 * page is protected, exit. */
1068 cmp 4(%esp), %eax
1069 jae ascs_clear_loop
1070 cmp 8(%esp), %eax
1071 jbe ascs_clear_loop
1072 cmpl $(NIL), THREAD_CONTROL_STACK_GUARD_PAGE_PROTECTED_OFFSET(%ecx)
1073 jne ascs_finished
1075 /* Clear memory backwards to the start of the (4KiB) page */
1076 ascs_clear_loop:
1077 movl $0, (%eax)
1078 test $0xfff, %eax
1079 lea -4(%eax), %eax
1080 jnz ascs_clear_loop
1082 /* If we're about to hit the hard guard page, exit. */
1083 cmp %edx, %eax
1084 jae ascs_finished
1086 /* If the next (previous?) 4KiB page contains a non-zero
1087 * word, continue scrubbing. */
1088 ascs_check_loop:
1089 testl $-1, (%eax)
1090 jnz ascs_outer_loop
1091 test $0xfff, %eax
1092 lea -4(%eax), %eax
1093 jnz ascs_check_loop
1095 ascs_finished:
1096 ret
1097 SIZE(GNAME(arch_scrub_control_stack))