1 /* Target-dependent code for GNU/Linux i386.
3 Copyright (C) 2000-2014 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
28 #include "reggroups.h"
29 #include "dwarf2-frame.h"
30 #include "i386-tdep.h"
31 #include "i386-linux-tdep.h"
32 #include "linux-tdep.h"
33 #include "glibc-tdep.h"
34 #include "solib-svr4.h"
36 #include "arch-utils.h"
37 #include "xml-syscall.h"
39 #include "i387-tdep.h"
40 #include "x86-xstate.h"
42 /* The syscall's XML filename for i386. */
43 #define XML_SYSCALL_FILENAME_I386 "syscalls/i386-linux.xml"
45 #include "record-full.h"
46 #include "linux-record.h"
49 #include "features/i386/i386-linux.c"
50 #include "features/i386/i386-mmx-linux.c"
51 #include "features/i386/i386-mpx-linux.c"
52 #include "features/i386/i386-avx-linux.c"
53 #include "features/i386/i386-avx512-linux.c"
55 /* Return non-zero, when the register is in the corresponding register
56 group. Put the LINUX_ORIG_EAX register in the system group. */
58 i386_linux_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
59 struct reggroup *group)
61 if (regnum == I386_LINUX_ORIG_EAX_REGNUM)
62 return (group == system_reggroup
63 || group == save_reggroup
64 || group == restore_reggroup);
65 return i386_register_reggroup_p (gdbarch, regnum, group);
69 /* Recognizing signal handler frames. */
71 /* GNU/Linux has two flavors of signals. Normal signal handlers, and
72 "realtime" (RT) signals. The RT signals can provide additional
73 information to the signal handler if the SA_SIGINFO flag is set
74 when establishing a signal handler using `sigaction'. It is not
75 unlikely that future versions of GNU/Linux will support SA_SIGINFO
76 for normal signals too. */
78 /* When the i386 Linux kernel calls a signal handler and the
79 SA_RESTORER flag isn't set, the return address points to a bit of
80 code on the stack. This function returns whether the PC appears to
81 be within this bit of code.
83 The instruction sequence for normal signals is
87 or 0x58 0xb8 0x77 0x00 0x00 0x00 0xcd 0x80.
89 Checking for the code sequence should be somewhat reliable, because
90 the effect is to call the system call sigreturn. This is unlikely
91 to occur anywhere other than in a signal trampoline.
93 It kind of sucks that we have to read memory from the process in
94 order to identify a signal trampoline, but there doesn't seem to be
95 any other way. Therefore we only do the memory reads if no
96 function name could be identified, which should be the case since
97 the code is on the stack.
99 Detection of signal trampolines for handlers that set the
100 SA_RESTORER flag is in general not possible. Unfortunately this is
101 what the GNU C Library has been doing for quite some time now.
102 However, as of version 2.1.2, the GNU C Library uses signal
103 trampolines (named __restore and __restore_rt) that are identical
104 to the ones used by the kernel. Therefore, these trampolines are
107 #define LINUX_SIGTRAMP_INSN0 0x58 /* pop %eax */
108 #define LINUX_SIGTRAMP_OFFSET0 0
109 #define LINUX_SIGTRAMP_INSN1 0xb8 /* mov $NNNN, %eax */
110 #define LINUX_SIGTRAMP_OFFSET1 1
111 #define LINUX_SIGTRAMP_INSN2 0xcd /* int */
112 #define LINUX_SIGTRAMP_OFFSET2 6
114 static const gdb_byte linux_sigtramp_code[] =
116 LINUX_SIGTRAMP_INSN0, /* pop %eax */
117 LINUX_SIGTRAMP_INSN1, 0x77, 0x00, 0x00, 0x00, /* mov $0x77, %eax */
118 LINUX_SIGTRAMP_INSN2, 0x80 /* int $0x80 */
121 #define LINUX_SIGTRAMP_LEN (sizeof linux_sigtramp_code)
123 /* If THIS_FRAME is a sigtramp routine, return the address of the
124 start of the routine. Otherwise, return 0. */
127 i386_linux_sigtramp_start (struct frame_info *this_frame)
129 CORE_ADDR pc = get_frame_pc (this_frame);
130 gdb_byte buf[LINUX_SIGTRAMP_LEN];
132 /* We only recognize a signal trampoline if PC is at the start of
133 one of the three instructions. We optimize for finding the PC at
134 the start, as will be the case when the trampoline is not the
135 first frame on the stack. We assume that in the case where the
136 PC is not at the start of the instruction sequence, there will be
137 a few trailing readable bytes on the stack. */
139 if (!safe_frame_unwind_memory (this_frame, pc, buf, LINUX_SIGTRAMP_LEN))
142 if (buf[0] != LINUX_SIGTRAMP_INSN0)
148 case LINUX_SIGTRAMP_INSN1:
149 adjust = LINUX_SIGTRAMP_OFFSET1;
151 case LINUX_SIGTRAMP_INSN2:
152 adjust = LINUX_SIGTRAMP_OFFSET2;
160 if (!safe_frame_unwind_memory (this_frame, pc, buf, LINUX_SIGTRAMP_LEN))
164 if (memcmp (buf, linux_sigtramp_code, LINUX_SIGTRAMP_LEN) != 0)
170 /* This function does the same for RT signals. Here the instruction
174 or 0xb8 0xad 0x00 0x00 0x00 0xcd 0x80.
176 The effect is to call the system call rt_sigreturn. */
178 #define LINUX_RT_SIGTRAMP_INSN0 0xb8 /* mov $NNNN, %eax */
179 #define LINUX_RT_SIGTRAMP_OFFSET0 0
180 #define LINUX_RT_SIGTRAMP_INSN1 0xcd /* int */
181 #define LINUX_RT_SIGTRAMP_OFFSET1 5
183 static const gdb_byte linux_rt_sigtramp_code[] =
185 LINUX_RT_SIGTRAMP_INSN0, 0xad, 0x00, 0x00, 0x00, /* mov $0xad, %eax */
186 LINUX_RT_SIGTRAMP_INSN1, 0x80 /* int $0x80 */
189 #define LINUX_RT_SIGTRAMP_LEN (sizeof linux_rt_sigtramp_code)
191 /* If THIS_FRAME is an RT sigtramp routine, return the address of the
192 start of the routine. Otherwise, return 0. */
195 i386_linux_rt_sigtramp_start (struct frame_info *this_frame)
197 CORE_ADDR pc = get_frame_pc (this_frame);
198 gdb_byte buf[LINUX_RT_SIGTRAMP_LEN];
200 /* We only recognize a signal trampoline if PC is at the start of
201 one of the two instructions. We optimize for finding the PC at
202 the start, as will be the case when the trampoline is not the
203 first frame on the stack. We assume that in the case where the
204 PC is not at the start of the instruction sequence, there will be
205 a few trailing readable bytes on the stack. */
207 if (!safe_frame_unwind_memory (this_frame, pc, buf, LINUX_RT_SIGTRAMP_LEN))
210 if (buf[0] != LINUX_RT_SIGTRAMP_INSN0)
212 if (buf[0] != LINUX_RT_SIGTRAMP_INSN1)
215 pc -= LINUX_RT_SIGTRAMP_OFFSET1;
217 if (!safe_frame_unwind_memory (this_frame, pc, buf,
218 LINUX_RT_SIGTRAMP_LEN))
222 if (memcmp (buf, linux_rt_sigtramp_code, LINUX_RT_SIGTRAMP_LEN) != 0)
228 /* Return whether THIS_FRAME corresponds to a GNU/Linux sigtramp
232 i386_linux_sigtramp_p (struct frame_info *this_frame)
234 CORE_ADDR pc = get_frame_pc (this_frame);
237 find_pc_partial_function (pc, &name, NULL, NULL);
239 /* If we have NAME, we can optimize the search. The trampolines are
240 named __restore and __restore_rt. However, they aren't dynamically
241 exported from the shared C library, so the trampoline may appear to
242 be part of the preceding function. This should always be sigaction,
243 __sigaction, or __libc_sigaction (all aliases to the same function). */
244 if (name == NULL || strstr (name, "sigaction") != NULL)
245 return (i386_linux_sigtramp_start (this_frame) != 0
246 || i386_linux_rt_sigtramp_start (this_frame) != 0);
248 return (strcmp ("__restore", name) == 0
249 || strcmp ("__restore_rt", name) == 0);
252 /* Return one if the PC of THIS_FRAME is in a signal trampoline which
253 may have DWARF-2 CFI. */
256 i386_linux_dwarf_signal_frame_p (struct gdbarch *gdbarch,
257 struct frame_info *this_frame)
259 CORE_ADDR pc = get_frame_pc (this_frame);
262 find_pc_partial_function (pc, &name, NULL, NULL);
264 /* If a vsyscall DSO is in use, the signal trampolines may have these
266 if (name && (strcmp (name, "__kernel_sigreturn") == 0
267 || strcmp (name, "__kernel_rt_sigreturn") == 0))
273 /* Offset to struct sigcontext in ucontext, from <asm/ucontext.h>. */
274 #define I386_LINUX_UCONTEXT_SIGCONTEXT_OFFSET 20
276 /* Assuming THIS_FRAME is a GNU/Linux sigtramp routine, return the
277 address of the associated sigcontext structure. */
280 i386_linux_sigcontext_addr (struct frame_info *this_frame)
282 struct gdbarch *gdbarch = get_frame_arch (this_frame);
283 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
288 get_frame_register (this_frame, I386_ESP_REGNUM, buf);
289 sp = extract_unsigned_integer (buf, 4, byte_order);
291 pc = i386_linux_sigtramp_start (this_frame);
294 /* The sigcontext structure lives on the stack, right after
295 the signum argument. We determine the address of the
296 sigcontext structure by looking at the frame's stack
297 pointer. Keep in mind that the first instruction of the
298 sigtramp code is "pop %eax". If the PC is after this
299 instruction, adjust the returned value accordingly. */
300 if (pc == get_frame_pc (this_frame))
305 pc = i386_linux_rt_sigtramp_start (this_frame);
308 CORE_ADDR ucontext_addr;
310 /* The sigcontext structure is part of the user context. A
311 pointer to the user context is passed as the third argument
312 to the signal handler. */
313 read_memory (sp + 8, buf, 4);
314 ucontext_addr = extract_unsigned_integer (buf, 4, byte_order);
315 return ucontext_addr + I386_LINUX_UCONTEXT_SIGCONTEXT_OFFSET;
318 error (_("Couldn't recognize signal trampoline."));
322 /* Set the program counter for process PTID to PC. */
325 i386_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
327 regcache_cooked_write_unsigned (regcache, I386_EIP_REGNUM, pc);
329 /* We must be careful with modifying the program counter. If we
330 just interrupted a system call, the kernel might try to restart
331 it when we resume the inferior. On restarting the system call,
332 the kernel will try backing up the program counter even though it
333 no longer points at the system call. This typically results in a
334 SIGSEGV or SIGILL. We can prevent this by writing `-1' in the
335 "orig_eax" pseudo-register.
337 Note that "orig_eax" is saved when setting up a dummy call frame.
338 This means that it is properly restored when that frame is
339 popped, and that the interrupted system call will be restarted
340 when we resume the inferior on return from a function call from
341 within GDB. In all other cases the system call will not be
343 regcache_cooked_write_unsigned (regcache, I386_LINUX_ORIG_EAX_REGNUM, -1);
346 /* Record all registers but IP register for process-record. */
349 i386_all_but_ip_registers_record (struct regcache *regcache)
351 if (record_full_arch_list_add_reg (regcache, I386_EAX_REGNUM))
353 if (record_full_arch_list_add_reg (regcache, I386_ECX_REGNUM))
355 if (record_full_arch_list_add_reg (regcache, I386_EDX_REGNUM))
357 if (record_full_arch_list_add_reg (regcache, I386_EBX_REGNUM))
359 if (record_full_arch_list_add_reg (regcache, I386_ESP_REGNUM))
361 if (record_full_arch_list_add_reg (regcache, I386_EBP_REGNUM))
363 if (record_full_arch_list_add_reg (regcache, I386_ESI_REGNUM))
365 if (record_full_arch_list_add_reg (regcache, I386_EDI_REGNUM))
367 if (record_full_arch_list_add_reg (regcache, I386_EFLAGS_REGNUM))
373 /* i386_canonicalize_syscall maps from the native i386 Linux set
374 of syscall ids into a canonical set of syscall ids used by
375 process record (a mostly trivial mapping, since the canonical
376 set was originally taken from the i386 set). */
378 static enum gdb_syscall
379 i386_canonicalize_syscall (int syscall)
381 enum { i386_syscall_max = 499 };
383 if (syscall <= i386_syscall_max)
389 /* Parse the arguments of current system call instruction and record
390 the values of the registers and memory that will be changed into
391 "record_arch_list". This instruction is "int 0x80" (Linux
392 Kernel2.4) or "sysenter" (Linux Kernel 2.6).
394 Return -1 if something wrong. */
396 static struct linux_record_tdep i386_linux_record_tdep;
399 i386_linux_intx80_sysenter_syscall_record (struct regcache *regcache)
402 LONGEST syscall_native;
403 enum gdb_syscall syscall_gdb;
405 regcache_raw_read_signed (regcache, I386_EAX_REGNUM, &syscall_native);
407 syscall_gdb = i386_canonicalize_syscall (syscall_native);
411 printf_unfiltered (_("Process record and replay target doesn't "
412 "support syscall number %s\n"),
413 plongest (syscall_native));
417 if (syscall_gdb == gdb_sys_sigreturn
418 || syscall_gdb == gdb_sys_rt_sigreturn)
420 if (i386_all_but_ip_registers_record (regcache))
425 ret = record_linux_system_call (syscall_gdb, regcache,
426 &i386_linux_record_tdep);
430 /* Record the return value of the system call. */
431 if (record_full_arch_list_add_reg (regcache, I386_EAX_REGNUM))
437 #define I386_LINUX_xstate 270
438 #define I386_LINUX_frame_size 732
441 i386_linux_record_signal (struct gdbarch *gdbarch,
442 struct regcache *regcache,
443 enum gdb_signal signal)
447 if (i386_all_but_ip_registers_record (regcache))
450 if (record_full_arch_list_add_reg (regcache, I386_EIP_REGNUM))
453 /* Record the change in the stack. */
454 regcache_raw_read_unsigned (regcache, I386_ESP_REGNUM, &esp);
455 /* This is for xstate.
456 sp -= sizeof (struct _fpstate); */
457 esp -= I386_LINUX_xstate;
458 /* This is for frame_size.
459 sp -= sizeof (struct rt_sigframe); */
460 esp -= I386_LINUX_frame_size;
461 if (record_full_arch_list_add_mem (esp,
462 I386_LINUX_xstate + I386_LINUX_frame_size))
465 if (record_full_arch_list_add_end ())
472 /* Core of the implementation for gdbarch get_syscall_number. Get pending
473 syscall number from REGCACHE. If there is no pending syscall -1 will be
474 returned. Pending syscall means ptrace has stepped into the syscall but
475 another ptrace call will step out. PC is right after the int $0x80
476 / syscall / sysenter instruction in both cases, PC does not change during
477 the second ptrace step. */
480 i386_linux_get_syscall_number_from_regcache (struct regcache *regcache)
482 struct gdbarch *gdbarch = get_regcache_arch (regcache);
483 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
484 /* The content of a register. */
489 /* Getting the system call number from the register.
490 When dealing with x86 architecture, this information
491 is stored at %eax register. */
492 regcache_cooked_read (regcache, I386_LINUX_ORIG_EAX_REGNUM, buf);
494 ret = extract_signed_integer (buf, 4, byte_order);
499 /* Wrapper for i386_linux_get_syscall_number_from_regcache to make it
500 compatible with gdbarch get_syscall_number method prototype. */
503 i386_linux_get_syscall_number (struct gdbarch *gdbarch,
506 struct regcache *regcache = get_thread_regcache (ptid);
508 return i386_linux_get_syscall_number_from_regcache (regcache);
511 /* The register sets used in GNU/Linux ELF core-dumps are identical to
512 the register sets in `struct user' that are used for a.out
513 core-dumps. These are also used by ptrace(2). The corresponding
514 types are `elf_gregset_t' for the general-purpose registers (with
515 `elf_greg_t' the type of a single GP register) and `elf_fpregset_t'
516 for the floating-point registers.
518 Those types used to be available under the names `gregset_t' and
519 `fpregset_t' too, and GDB used those names in the past. But those
520 names are now used for the register sets used in the `mcontext_t'
521 type, which have a different size and layout. */
523 /* Mapping between the general-purpose registers in `struct user'
524 format and GDB's register cache layout. */
526 /* From <sys/reg.h>. */
527 int i386_linux_gregset_reg_offset[] =
538 14 * 4, /* %eflags */
545 -1, -1, -1, -1, -1, -1, -1, -1,
546 -1, -1, -1, -1, -1, -1, -1, -1,
547 -1, -1, -1, -1, -1, -1, -1, -1,
549 -1, -1, -1, -1, -1, -1, -1, -1,
550 -1, -1, -1, -1, /* MPX registers BND0 ... BND3. */
551 -1, -1, /* MPX registers BNDCFGU, BNDSTATUS. */
552 -1, -1, -1, -1, -1, -1, -1, -1, /* k0 ... k7 (AVX512) */
553 -1, -1, -1, -1, -1, -1, -1, -1, /* zmm0 ... zmm7 (AVX512) */
554 11 * 4, /* "orig_eax" */
557 /* Mapping between the general-purpose registers in `struct
558 sigcontext' format and GDB's register cache layout. */
560 /* From <asm/sigcontext.h>. */
561 static int i386_linux_sc_reg_offset[] =
572 16 * 4, /* %eflags */
581 /* Get XSAVE extended state xcr0 from core dump. */
584 i386_linux_core_read_xcr0 (bfd *abfd)
586 asection *xstate = bfd_get_section_by_name (abfd, ".reg-xstate");
591 size_t size = bfd_section_size (abfd, xstate);
593 /* Check extended state size. */
594 if (size < X86_XSTATE_AVX_SIZE)
595 xcr0 = X86_XSTATE_SSE_MASK;
600 if (! bfd_get_section_contents (abfd, xstate, contents,
601 I386_LINUX_XSAVE_XCR0_OFFSET,
604 warning (_("Couldn't read `xcr0' bytes from "
605 "`.reg-xstate' section in core file."));
609 xcr0 = bfd_get_64 (abfd, contents);
618 /* Get Linux/x86 target description from core dump. */
620 static const struct target_desc *
621 i386_linux_core_read_description (struct gdbarch *gdbarch,
622 struct target_ops *target,
626 uint64_t xcr0 = i386_linux_core_read_xcr0 (abfd);
628 switch ((xcr0 & X86_XSTATE_ALL_MASK))
630 case X86_XSTATE_MPX_AVX512_MASK:
631 case X86_XSTATE_AVX512_MASK:
632 return tdesc_i386_avx512_linux;
633 case X86_XSTATE_MPX_MASK:
634 return tdesc_i386_mpx_linux;
635 case X86_XSTATE_AVX_MASK:
636 return tdesc_i386_avx_linux;
637 case X86_XSTATE_SSE_MASK:
638 return tdesc_i386_linux;
639 case X86_XSTATE_X87_MASK:
640 return tdesc_i386_mmx_linux;
645 if (bfd_get_section_by_name (abfd, ".reg-xfp") != NULL)
646 return tdesc_i386_linux;
648 return tdesc_i386_mmx_linux;
651 /* Iterate over core file register note sections. */
654 i386_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
655 iterate_over_regset_sections_cb *cb,
657 const struct regcache *regcache)
659 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
661 cb (".reg", 68, "general-purpose", cb_data);
663 if (tdep->xcr0 & X86_XSTATE_AVX)
664 cb (".reg-xstate", X86_XSTATE_MAX_SIZE, "XSAVE extended state", cb_data);
665 else if (tdep->xcr0 & X86_XSTATE_SSE)
666 cb (".reg-xfp", 512, "extended floating-point", cb_data);
668 cb (".reg2", 108, "floating-point", cb_data);
671 /* Linux kernel shows PC value after the 'int $0x80' instruction even if
672 inferior is still inside the syscall. On next PTRACE_SINGLESTEP it will
673 finish the syscall but PC will not change.
675 Some vDSOs contain 'int $0x80; ret' and during stepping out of the syscall
676 i386_displaced_step_fixup would keep PC at the displaced pad location.
677 As PC is pointing to the 'ret' instruction before the step
678 i386_displaced_step_fixup would expect inferior has just executed that 'ret'
679 and PC should not be adjusted. In reality it finished syscall instead and
680 PC should get relocated back to its vDSO address. Hide the 'ret'
681 instruction by 'nop' so that i386_displaced_step_fixup is not confused.
683 It is not fully correct as the bytes in struct displaced_step_closure will
684 not match the inferior code. But we would need some new flag in
685 displaced_step_closure otherwise to keep the state that syscall is finishing
686 for the later i386_displaced_step_fixup execution as the syscall execution
687 is already no longer detectable there. The new flag field would mean
688 i386-linux-tdep.c needs to wrap all the displacement methods of i386-tdep.c
689 which does not seem worth it. The same effect is achieved by patching that
690 'nop' instruction there instead. */
692 static struct displaced_step_closure *
693 i386_linux_displaced_step_copy_insn (struct gdbarch *gdbarch,
694 CORE_ADDR from, CORE_ADDR to,
695 struct regcache *regs)
697 struct displaced_step_closure *closure;
699 closure = i386_displaced_step_copy_insn (gdbarch, from, to, regs);
701 if (i386_linux_get_syscall_number_from_regcache (regs) != -1)
703 /* Since we use simple_displaced_step_copy_insn, our closure is a
704 copy of the instruction. */
705 gdb_byte *insn = (gdb_byte *) closure;
715 i386_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
717 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
718 const struct target_desc *tdesc = info.target_desc;
719 struct tdesc_arch_data *tdesc_data = (void *) info.tdep_info;
720 const struct tdesc_feature *feature;
723 gdb_assert (tdesc_data);
725 linux_init_abi (info, gdbarch);
727 /* GNU/Linux uses ELF. */
728 i386_elf_init_abi (info, gdbarch);
730 /* Reserve a number for orig_eax. */
731 set_gdbarch_num_regs (gdbarch, I386_LINUX_NUM_REGS);
733 if (! tdesc_has_registers (tdesc))
734 tdesc = tdesc_i386_linux;
737 feature = tdesc_find_feature (tdesc, "org.gnu.gdb.i386.linux");
741 valid_p = tdesc_numbered_register (feature, tdesc_data,
742 I386_LINUX_ORIG_EAX_REGNUM,
747 /* Add the %orig_eax register used for syscall restarting. */
748 set_gdbarch_write_pc (gdbarch, i386_linux_write_pc);
750 tdep->register_reggroup_p = i386_linux_register_reggroup_p;
752 tdep->gregset_reg_offset = i386_linux_gregset_reg_offset;
753 tdep->gregset_num_regs = ARRAY_SIZE (i386_linux_gregset_reg_offset);
754 tdep->sizeof_gregset = 17 * 4;
756 tdep->jb_pc_offset = 20; /* From <bits/setjmp.h>. */
758 tdep->sigtramp_p = i386_linux_sigtramp_p;
759 tdep->sigcontext_addr = i386_linux_sigcontext_addr;
760 tdep->sc_reg_offset = i386_linux_sc_reg_offset;
761 tdep->sc_num_regs = ARRAY_SIZE (i386_linux_sc_reg_offset);
763 tdep->xsave_xcr0_offset = I386_LINUX_XSAVE_XCR0_OFFSET;
765 set_gdbarch_process_record (gdbarch, i386_process_record);
766 set_gdbarch_process_record_signal (gdbarch, i386_linux_record_signal);
768 /* Initialize the i386_linux_record_tdep. */
769 /* These values are the size of the type that will be used in a system
770 call. They are obtained from Linux Kernel source. */
771 i386_linux_record_tdep.size_pointer
772 = gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT;
773 i386_linux_record_tdep.size__old_kernel_stat = 32;
774 i386_linux_record_tdep.size_tms = 16;
775 i386_linux_record_tdep.size_loff_t = 8;
776 i386_linux_record_tdep.size_flock = 16;
777 i386_linux_record_tdep.size_oldold_utsname = 45;
778 i386_linux_record_tdep.size_ustat = 20;
779 i386_linux_record_tdep.size_old_sigaction = 140;
780 i386_linux_record_tdep.size_old_sigset_t = 128;
781 i386_linux_record_tdep.size_rlimit = 8;
782 i386_linux_record_tdep.size_rusage = 72;
783 i386_linux_record_tdep.size_timeval = 8;
784 i386_linux_record_tdep.size_timezone = 8;
785 i386_linux_record_tdep.size_old_gid_t = 2;
786 i386_linux_record_tdep.size_old_uid_t = 2;
787 i386_linux_record_tdep.size_fd_set = 128;
788 i386_linux_record_tdep.size_dirent = 268;
789 i386_linux_record_tdep.size_dirent64 = 276;
790 i386_linux_record_tdep.size_statfs = 64;
791 i386_linux_record_tdep.size_statfs64 = 84;
792 i386_linux_record_tdep.size_sockaddr = 16;
793 i386_linux_record_tdep.size_int
794 = gdbarch_int_bit (gdbarch) / TARGET_CHAR_BIT;
795 i386_linux_record_tdep.size_long
796 = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
797 i386_linux_record_tdep.size_ulong
798 = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
799 i386_linux_record_tdep.size_msghdr = 28;
800 i386_linux_record_tdep.size_itimerval = 16;
801 i386_linux_record_tdep.size_stat = 88;
802 i386_linux_record_tdep.size_old_utsname = 325;
803 i386_linux_record_tdep.size_sysinfo = 64;
804 i386_linux_record_tdep.size_msqid_ds = 88;
805 i386_linux_record_tdep.size_shmid_ds = 84;
806 i386_linux_record_tdep.size_new_utsname = 390;
807 i386_linux_record_tdep.size_timex = 128;
808 i386_linux_record_tdep.size_mem_dqinfo = 24;
809 i386_linux_record_tdep.size_if_dqblk = 68;
810 i386_linux_record_tdep.size_fs_quota_stat = 68;
811 i386_linux_record_tdep.size_timespec = 8;
812 i386_linux_record_tdep.size_pollfd = 8;
813 i386_linux_record_tdep.size_NFS_FHSIZE = 32;
814 i386_linux_record_tdep.size_knfsd_fh = 132;
815 i386_linux_record_tdep.size_TASK_COMM_LEN = 16;
816 i386_linux_record_tdep.size_sigaction = 140;
817 i386_linux_record_tdep.size_sigset_t = 8;
818 i386_linux_record_tdep.size_siginfo_t = 128;
819 i386_linux_record_tdep.size_cap_user_data_t = 12;
820 i386_linux_record_tdep.size_stack_t = 12;
821 i386_linux_record_tdep.size_off_t = i386_linux_record_tdep.size_long;
822 i386_linux_record_tdep.size_stat64 = 96;
823 i386_linux_record_tdep.size_gid_t = 2;
824 i386_linux_record_tdep.size_uid_t = 2;
825 i386_linux_record_tdep.size_PAGE_SIZE = 4096;
826 i386_linux_record_tdep.size_flock64 = 24;
827 i386_linux_record_tdep.size_user_desc = 16;
828 i386_linux_record_tdep.size_io_event = 32;
829 i386_linux_record_tdep.size_iocb = 64;
830 i386_linux_record_tdep.size_epoll_event = 12;
831 i386_linux_record_tdep.size_itimerspec
832 = i386_linux_record_tdep.size_timespec * 2;
833 i386_linux_record_tdep.size_mq_attr = 32;
834 i386_linux_record_tdep.size_siginfo = 128;
835 i386_linux_record_tdep.size_termios = 36;
836 i386_linux_record_tdep.size_termios2 = 44;
837 i386_linux_record_tdep.size_pid_t = 4;
838 i386_linux_record_tdep.size_winsize = 8;
839 i386_linux_record_tdep.size_serial_struct = 60;
840 i386_linux_record_tdep.size_serial_icounter_struct = 80;
841 i386_linux_record_tdep.size_hayes_esp_config = 12;
842 i386_linux_record_tdep.size_size_t = 4;
843 i386_linux_record_tdep.size_iovec = 8;
845 /* These values are the second argument of system call "sys_ioctl".
846 They are obtained from Linux Kernel source. */
847 i386_linux_record_tdep.ioctl_TCGETS = 0x5401;
848 i386_linux_record_tdep.ioctl_TCSETS = 0x5402;
849 i386_linux_record_tdep.ioctl_TCSETSW = 0x5403;
850 i386_linux_record_tdep.ioctl_TCSETSF = 0x5404;
851 i386_linux_record_tdep.ioctl_TCGETA = 0x5405;
852 i386_linux_record_tdep.ioctl_TCSETA = 0x5406;
853 i386_linux_record_tdep.ioctl_TCSETAW = 0x5407;
854 i386_linux_record_tdep.ioctl_TCSETAF = 0x5408;
855 i386_linux_record_tdep.ioctl_TCSBRK = 0x5409;
856 i386_linux_record_tdep.ioctl_TCXONC = 0x540A;
857 i386_linux_record_tdep.ioctl_TCFLSH = 0x540B;
858 i386_linux_record_tdep.ioctl_TIOCEXCL = 0x540C;
859 i386_linux_record_tdep.ioctl_TIOCNXCL = 0x540D;
860 i386_linux_record_tdep.ioctl_TIOCSCTTY = 0x540E;
861 i386_linux_record_tdep.ioctl_TIOCGPGRP = 0x540F;
862 i386_linux_record_tdep.ioctl_TIOCSPGRP = 0x5410;
863 i386_linux_record_tdep.ioctl_TIOCOUTQ = 0x5411;
864 i386_linux_record_tdep.ioctl_TIOCSTI = 0x5412;
865 i386_linux_record_tdep.ioctl_TIOCGWINSZ = 0x5413;
866 i386_linux_record_tdep.ioctl_TIOCSWINSZ = 0x5414;
867 i386_linux_record_tdep.ioctl_TIOCMGET = 0x5415;
868 i386_linux_record_tdep.ioctl_TIOCMBIS = 0x5416;
869 i386_linux_record_tdep.ioctl_TIOCMBIC = 0x5417;
870 i386_linux_record_tdep.ioctl_TIOCMSET = 0x5418;
871 i386_linux_record_tdep.ioctl_TIOCGSOFTCAR = 0x5419;
872 i386_linux_record_tdep.ioctl_TIOCSSOFTCAR = 0x541A;
873 i386_linux_record_tdep.ioctl_FIONREAD = 0x541B;
874 i386_linux_record_tdep.ioctl_TIOCINQ = i386_linux_record_tdep.ioctl_FIONREAD;
875 i386_linux_record_tdep.ioctl_TIOCLINUX = 0x541C;
876 i386_linux_record_tdep.ioctl_TIOCCONS = 0x541D;
877 i386_linux_record_tdep.ioctl_TIOCGSERIAL = 0x541E;
878 i386_linux_record_tdep.ioctl_TIOCSSERIAL = 0x541F;
879 i386_linux_record_tdep.ioctl_TIOCPKT = 0x5420;
880 i386_linux_record_tdep.ioctl_FIONBIO = 0x5421;
881 i386_linux_record_tdep.ioctl_TIOCNOTTY = 0x5422;
882 i386_linux_record_tdep.ioctl_TIOCSETD = 0x5423;
883 i386_linux_record_tdep.ioctl_TIOCGETD = 0x5424;
884 i386_linux_record_tdep.ioctl_TCSBRKP = 0x5425;
885 i386_linux_record_tdep.ioctl_TIOCTTYGSTRUCT = 0x5426;
886 i386_linux_record_tdep.ioctl_TIOCSBRK = 0x5427;
887 i386_linux_record_tdep.ioctl_TIOCCBRK = 0x5428;
888 i386_linux_record_tdep.ioctl_TIOCGSID = 0x5429;
889 i386_linux_record_tdep.ioctl_TCGETS2 = 0x802c542a;
890 i386_linux_record_tdep.ioctl_TCSETS2 = 0x402c542b;
891 i386_linux_record_tdep.ioctl_TCSETSW2 = 0x402c542c;
892 i386_linux_record_tdep.ioctl_TCSETSF2 = 0x402c542d;
893 i386_linux_record_tdep.ioctl_TIOCGPTN = 0x80045430;
894 i386_linux_record_tdep.ioctl_TIOCSPTLCK = 0x40045431;
895 i386_linux_record_tdep.ioctl_FIONCLEX = 0x5450;
896 i386_linux_record_tdep.ioctl_FIOCLEX = 0x5451;
897 i386_linux_record_tdep.ioctl_FIOASYNC = 0x5452;
898 i386_linux_record_tdep.ioctl_TIOCSERCONFIG = 0x5453;
899 i386_linux_record_tdep.ioctl_TIOCSERGWILD = 0x5454;
900 i386_linux_record_tdep.ioctl_TIOCSERSWILD = 0x5455;
901 i386_linux_record_tdep.ioctl_TIOCGLCKTRMIOS = 0x5456;
902 i386_linux_record_tdep.ioctl_TIOCSLCKTRMIOS = 0x5457;
903 i386_linux_record_tdep.ioctl_TIOCSERGSTRUCT = 0x5458;
904 i386_linux_record_tdep.ioctl_TIOCSERGETLSR = 0x5459;
905 i386_linux_record_tdep.ioctl_TIOCSERGETMULTI = 0x545A;
906 i386_linux_record_tdep.ioctl_TIOCSERSETMULTI = 0x545B;
907 i386_linux_record_tdep.ioctl_TIOCMIWAIT = 0x545C;
908 i386_linux_record_tdep.ioctl_TIOCGICOUNT = 0x545D;
909 i386_linux_record_tdep.ioctl_TIOCGHAYESESP = 0x545E;
910 i386_linux_record_tdep.ioctl_TIOCSHAYESESP = 0x545F;
911 i386_linux_record_tdep.ioctl_FIOQSIZE = 0x5460;
913 /* These values are the second argument of system call "sys_fcntl"
914 and "sys_fcntl64". They are obtained from Linux Kernel source. */
915 i386_linux_record_tdep.fcntl_F_GETLK = 5;
916 i386_linux_record_tdep.fcntl_F_GETLK64 = 12;
917 i386_linux_record_tdep.fcntl_F_SETLK64 = 13;
918 i386_linux_record_tdep.fcntl_F_SETLKW64 = 14;
920 i386_linux_record_tdep.arg1 = I386_EBX_REGNUM;
921 i386_linux_record_tdep.arg2 = I386_ECX_REGNUM;
922 i386_linux_record_tdep.arg3 = I386_EDX_REGNUM;
923 i386_linux_record_tdep.arg4 = I386_ESI_REGNUM;
924 i386_linux_record_tdep.arg5 = I386_EDI_REGNUM;
925 i386_linux_record_tdep.arg6 = I386_EBP_REGNUM;
927 tdep->i386_intx80_record = i386_linux_intx80_sysenter_syscall_record;
928 tdep->i386_sysenter_record = i386_linux_intx80_sysenter_syscall_record;
929 tdep->i386_syscall_record = i386_linux_intx80_sysenter_syscall_record;
931 /* N_FUN symbols in shared libaries have 0 for their values and need
933 set_gdbarch_sofun_address_maybe_missing (gdbarch, 1);
935 /* GNU/Linux uses SVR4-style shared libraries. */
936 set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
937 set_solib_svr4_fetch_link_map_offsets
938 (gdbarch, svr4_ilp32_fetch_link_map_offsets);
940 /* GNU/Linux uses the dynamic linker included in the GNU C Library. */
941 set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
943 dwarf2_frame_set_signal_frame_p (gdbarch, i386_linux_dwarf_signal_frame_p);
945 /* Enable TLS support. */
946 set_gdbarch_fetch_tls_load_module_address (gdbarch,
947 svr4_fetch_objfile_link_map);
949 /* Core file support. */
950 set_gdbarch_iterate_over_regset_sections
951 (gdbarch, i386_linux_iterate_over_regset_sections);
952 set_gdbarch_core_read_description (gdbarch,
953 i386_linux_core_read_description);
955 /* Displaced stepping. */
956 set_gdbarch_displaced_step_copy_insn (gdbarch,
957 i386_linux_displaced_step_copy_insn);
958 set_gdbarch_displaced_step_fixup (gdbarch, i386_displaced_step_fixup);
959 set_gdbarch_displaced_step_free_closure (gdbarch,
960 simple_displaced_step_free_closure);
961 set_gdbarch_displaced_step_location (gdbarch,
962 displaced_step_at_entry_point);
964 /* Functions for 'catch syscall'. */
965 set_xml_syscall_file_name (XML_SYSCALL_FILENAME_I386);
966 set_gdbarch_get_syscall_number (gdbarch,
967 i386_linux_get_syscall_number);
969 set_gdbarch_get_siginfo_type (gdbarch, linux_get_siginfo_type);
972 /* Provide a prototype to silence -Wmissing-prototypes. */
973 extern void _initialize_i386_linux_tdep (void);
976 _initialize_i386_linux_tdep (void)
978 gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_LINUX,
979 i386_linux_init_abi);
981 /* Initialize the Linux target description. */
982 initialize_tdesc_i386_linux ();
983 initialize_tdesc_i386_mmx_linux ();
984 initialize_tdesc_i386_avx_linux ();
985 initialize_tdesc_i386_mpx_linux ();
986 initialize_tdesc_i386_avx512_linux ();