-/* Target-dependent code for Linux running on i386's, for GDB.
- Copyright (C) 2000 Free Software Foundation, Inc.
+/* Target-dependent code for GNU/Linux i386.
+
+ Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010,
+ 2011 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdbcore.h"
#include "frame.h"
#include "value.h"
+#include "regcache.h"
+#include "regset.h"
+#include "inferior.h"
+#include "osabi.h"
+#include "reggroups.h"
+#include "dwarf2-frame.h"
+#include "gdb_string.h"
+
+#include "i386-tdep.h"
+#include "i386-linux-tdep.h"
+#include "linux-tdep.h"
+#include "glibc-tdep.h"
+#include "solib-svr4.h"
+#include "symtab.h"
+#include "arch-utils.h"
+#include "xml-syscall.h"
+
+#include "i387-tdep.h"
+#include "i386-xstate.h"
+
+/* The syscall's XML filename for i386. */
+#define XML_SYSCALL_FILENAME_I386 "syscalls/i386-linux.xml"
+
+#include "record.h"
+#include "linux-record.h"
+#include <stdint.h>
+
+#include "features/i386/i386-linux.c"
+#include "features/i386/i386-mmx-linux.c"
+#include "features/i386/i386-avx-linux.c"
+
+/* Supported register note sections. */
+static struct core_regset_section i386_linux_regset_sections[] =
+{
+ { ".reg", 68, "general-purpose" },
+ { ".reg2", 108, "floating-point" },
+ { NULL, 0 }
+};
+
+static struct core_regset_section i386_linux_sse_regset_sections[] =
+{
+ { ".reg", 68, "general-purpose" },
+ { ".reg-xfp", 512, "extended floating-point" },
+ { NULL, 0 }
+};
+
+static struct core_regset_section i386_linux_avx_regset_sections[] =
+{
+ { ".reg", 68, "general-purpose" },
+ { ".reg-xstate", I386_XSTATE_MAX_SIZE, "XSAVE extended state" },
+ { NULL, 0 }
+};
+
+/* Return non-zero, when the register is in the corresponding register
+ group. Put the LINUX_ORIG_EAX register in the system group. */
+static int
+i386_linux_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
+ struct reggroup *group)
+{
+ if (regnum == I386_LINUX_ORIG_EAX_REGNUM)
+ return (group == system_reggroup
+ || group == save_reggroup
+ || group == restore_reggroup);
+ return i386_register_reggroup_p (gdbarch, regnum, group);
+}
\f
/* Recognizing signal handler frames. */
-/* Linux has two flavors of signals. Normal signal handlers, and
+/* GNU/Linux has two flavors of signals. Normal signal handlers, and
"realtime" (RT) signals. The RT signals can provide additional
information to the signal handler if the SA_SIGINFO flag is set
when establishing a signal handler using `sigaction'. It is not
- unlikely that future versions of Linux will support SA_SIGINFO for
- normal signals too. */
+ unlikely that future versions of GNU/Linux will support SA_SIGINFO
+ for normal signals too. */
/* When the i386 Linux kernel calls a signal handler and the
SA_RESTORER flag isn't set, the return address points to a bit of
The instruction sequence for normal signals is
pop %eax
- mov $0x77,%eax
+ mov $0x77, %eax
int $0x80
or 0x58 0xb8 0x77 0x00 0x00 0x00 0xcd 0x80.
Checking for the code sequence should be somewhat reliable, because
the effect is to call the system call sigreturn. This is unlikely
- to occur anywhere other than a signal trampoline.
+ to occur anywhere other than in a signal trampoline.
It kind of sucks that we have to read memory from the process in
order to identify a signal trampoline, but there doesn't seem to be
- any other way. The IN_SIGTRAMP macro in tm-linux.h arranges to
- only call us if no function name could be identified, which should
- be the case since the code is on the stack.
+ any other way. Therefore we only do the memory reads if no
+ function name could be identified, which should be the case since
+ the code is on the stack.
Detection of signal trampolines for handlers that set the
SA_RESTORER flag is in general not possible. Unfortunately this is
to the ones used by the kernel. Therefore, these trampolines are
supported too. */
-#define LINUX_SIGTRAMP_INSN0 (0x58) /* pop %eax */
-#define LINUX_SIGTRAMP_OFFSET0 (0)
-#define LINUX_SIGTRAMP_INSN1 (0xb8) /* mov $NNNN,%eax */
-#define LINUX_SIGTRAMP_OFFSET1 (1)
-#define LINUX_SIGTRAMP_INSN2 (0xcd) /* int */
-#define LINUX_SIGTRAMP_OFFSET2 (6)
+#define LINUX_SIGTRAMP_INSN0 0x58 /* pop %eax */
+#define LINUX_SIGTRAMP_OFFSET0 0
+#define LINUX_SIGTRAMP_INSN1 0xb8 /* mov $NNNN, %eax */
+#define LINUX_SIGTRAMP_OFFSET1 1
+#define LINUX_SIGTRAMP_INSN2 0xcd /* int */
+#define LINUX_SIGTRAMP_OFFSET2 6
-static const unsigned char linux_sigtramp_code[] =
+static const gdb_byte linux_sigtramp_code[] =
{
LINUX_SIGTRAMP_INSN0, /* pop %eax */
- LINUX_SIGTRAMP_INSN1, 0x77, 0x00, 0x00, 0x00, /* mov $0x77,%eax */
+ LINUX_SIGTRAMP_INSN1, 0x77, 0x00, 0x00, 0x00, /* mov $0x77, %eax */
LINUX_SIGTRAMP_INSN2, 0x80 /* int $0x80 */
};
#define LINUX_SIGTRAMP_LEN (sizeof linux_sigtramp_code)
-/* If PC is in a sigtramp routine, return the address of the start of
- the routine. Otherwise, return 0. */
+/* If THIS_FRAME is a sigtramp routine, return the address of the
+ start of the routine. Otherwise, return 0. */
static CORE_ADDR
-i386_linux_sigtramp_start (CORE_ADDR pc)
+i386_linux_sigtramp_start (struct frame_info *this_frame)
{
- unsigned char buf[LINUX_SIGTRAMP_LEN];
+ CORE_ADDR pc = get_frame_pc (this_frame);
+ gdb_byte buf[LINUX_SIGTRAMP_LEN];
/* We only recognize a signal trampoline if PC is at the start of
one of the three instructions. We optimize for finding the PC at
PC is not at the start of the instruction sequence, there will be
a few trailing readable bytes on the stack. */
- if (read_memory_nobpt (pc, (char *) buf, LINUX_SIGTRAMP_LEN) != 0)
+ if (!safe_frame_unwind_memory (this_frame, pc, buf, LINUX_SIGTRAMP_LEN))
return 0;
if (buf[0] != LINUX_SIGTRAMP_INSN0)
pc -= adjust;
- if (read_memory_nobpt (pc, (char *) buf, LINUX_SIGTRAMP_LEN) != 0)
+ if (!safe_frame_unwind_memory (this_frame, pc, buf, LINUX_SIGTRAMP_LEN))
return 0;
}
/* This function does the same for RT signals. Here the instruction
sequence is
- mov $0xad,%eax
+ mov $0xad, %eax
int $0x80
or 0xb8 0xad 0x00 0x00 0x00 0xcd 0x80.
The effect is to call the system call rt_sigreturn. */
-#define LINUX_RT_SIGTRAMP_INSN0 (0xb8) /* mov $NNNN,%eax */
-#define LINUX_RT_SIGTRAMP_OFFSET0 (0)
-#define LINUX_RT_SIGTRAMP_INSN1 (0xcd) /* int */
-#define LINUX_RT_SIGTRAMP_OFFSET1 (5)
+#define LINUX_RT_SIGTRAMP_INSN0 0xb8 /* mov $NNNN, %eax */
+#define LINUX_RT_SIGTRAMP_OFFSET0 0
+#define LINUX_RT_SIGTRAMP_INSN1 0xcd /* int */
+#define LINUX_RT_SIGTRAMP_OFFSET1 5
-static const unsigned char linux_rt_sigtramp_code[] =
+static const gdb_byte linux_rt_sigtramp_code[] =
{
- LINUX_RT_SIGTRAMP_INSN0, 0xad, 0x00, 0x00, 0x00, /* mov $0xad,%eax */
+ LINUX_RT_SIGTRAMP_INSN0, 0xad, 0x00, 0x00, 0x00, /* mov $0xad, %eax */
LINUX_RT_SIGTRAMP_INSN1, 0x80 /* int $0x80 */
};
#define LINUX_RT_SIGTRAMP_LEN (sizeof linux_rt_sigtramp_code)
-/* If PC is in a RT sigtramp routine, return the address of the start
- of the routine. Otherwise, return 0. */
+/* If THIS_FRAME is an RT sigtramp routine, return the address of the
+ start of the routine. Otherwise, return 0. */
static CORE_ADDR
-i386_linux_rt_sigtramp_start (CORE_ADDR pc)
+i386_linux_rt_sigtramp_start (struct frame_info *this_frame)
{
- unsigned char buf[LINUX_RT_SIGTRAMP_LEN];
+ CORE_ADDR pc = get_frame_pc (this_frame);
+ gdb_byte buf[LINUX_RT_SIGTRAMP_LEN];
/* We only recognize a signal trampoline if PC is at the start of
one of the two instructions. We optimize for finding the PC at
PC is not at the start of the instruction sequence, there will be
a few trailing readable bytes on the stack. */
- if (read_memory_nobpt (pc, (char *) buf, LINUX_RT_SIGTRAMP_LEN) != 0)
+ if (!safe_frame_unwind_memory (this_frame, pc, buf, LINUX_RT_SIGTRAMP_LEN))
return 0;
if (buf[0] != LINUX_RT_SIGTRAMP_INSN0)
pc -= LINUX_RT_SIGTRAMP_OFFSET1;
- if (read_memory_nobpt (pc, (char *) buf, LINUX_RT_SIGTRAMP_LEN) != 0)
+ if (!safe_frame_unwind_memory (this_frame, pc, buf,
+ LINUX_RT_SIGTRAMP_LEN))
return 0;
}
return pc;
}
-/* Return whether PC is in a Linux sigtramp routine. */
+/* Return whether THIS_FRAME corresponds to a GNU/Linux sigtramp
+ routine. */
-int
-i386_linux_in_sigtramp (CORE_ADDR pc, char *name)
+static int
+i386_linux_sigtramp_p (struct frame_info *this_frame)
+{
+ CORE_ADDR pc = get_frame_pc (this_frame);
+ char *name;
+
+ find_pc_partial_function (pc, &name, NULL, NULL);
+
+ /* If we have NAME, we can optimize the search. The trampolines are
+ named __restore and __restore_rt. However, they aren't dynamically
+ exported from the shared C library, so the trampoline may appear to
+ be part of the preceding function. This should always be sigaction,
+ __sigaction, or __libc_sigaction (all aliases to the same function). */
+ if (name == NULL || strstr (name, "sigaction") != NULL)
+ return (i386_linux_sigtramp_start (this_frame) != 0
+ || i386_linux_rt_sigtramp_start (this_frame) != 0);
+
+ return (strcmp ("__restore", name) == 0
+ || strcmp ("__restore_rt", name) == 0);
+}
+
+/* Return one if the PC of THIS_FRAME is in a signal trampoline which
+ may have DWARF-2 CFI. */
+
+static int
+i386_linux_dwarf_signal_frame_p (struct gdbarch *gdbarch,
+ struct frame_info *this_frame)
{
- if (name)
- return STREQ ("__restore", name) || STREQ ("__restore_rt", name);
-
- return (i386_linux_sigtramp_start (pc) != 0
- || i386_linux_rt_sigtramp_start (pc) != 0);
+ CORE_ADDR pc = get_frame_pc (this_frame);
+ char *name;
+
+ find_pc_partial_function (pc, &name, NULL, NULL);
+
+ /* If a vsyscall DSO is in use, the signal trampolines may have these
+ names. */
+ if (name && (strcmp (name, "__kernel_sigreturn") == 0
+ || strcmp (name, "__kernel_rt_sigreturn") == 0))
+ return 1;
+
+ return 0;
}
-/* Assuming FRAME is for a Linux sigtramp routine, return the address
- of the associated sigcontext structure. */
+/* Offset to struct sigcontext in ucontext, from <asm/ucontext.h>. */
+#define I386_LINUX_UCONTEXT_SIGCONTEXT_OFFSET 20
-CORE_ADDR
-i386_linux_sigcontext_addr (struct frame_info *frame)
+/* Assuming THIS_FRAME is a GNU/Linux sigtramp routine, return the
+ address of the associated sigcontext structure. */
+
+static CORE_ADDR
+i386_linux_sigcontext_addr (struct frame_info *this_frame)
{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR pc;
+ CORE_ADDR sp;
+ gdb_byte buf[4];
+
+ get_frame_register (this_frame, I386_ESP_REGNUM, buf);
+ sp = extract_unsigned_integer (buf, 4, byte_order);
- pc = i386_linux_sigtramp_start (frame->pc);
+ pc = i386_linux_sigtramp_start (this_frame);
if (pc)
{
- CORE_ADDR sp;
-
- if (frame->next)
- /* If this isn't the top frame, the next frame must be for the
- signal handler itself. The sigcontext structure lives on
- the stack, right after the signum argument. */
- return frame->next->frame + 12;
-
- /* This is the top frame. We'll have to find the address of the
- sigcontext structure by looking at the stack pointer. Keep
- in mind that the first instruction of the sigtramp code is
- "pop %eax". If the PC is at this instruction, adjust the
- returned value accordingly. */
- sp = read_register (SP_REGNUM);
- if (pc == frame->pc)
+ /* The sigcontext structure lives on the stack, right after
+ the signum argument. We determine the address of the
+ sigcontext structure by looking at the frame's stack
+ pointer. Keep in mind that the first instruction of the
+ sigtramp code is "pop %eax". If the PC is after this
+ instruction, adjust the returned value accordingly. */
+ if (pc == get_frame_pc (this_frame))
return sp + 4;
return sp;
}
- pc = i386_linux_rt_sigtramp_start (frame->pc);
+ pc = i386_linux_rt_sigtramp_start (this_frame);
if (pc)
{
- if (frame->next)
- /* If this isn't the top frame, the next frame must be for the
- signal handler itself. The sigcontext structure is part of
- the user context. A pointer to the user context is passed
- as the third argument to the signal handler. */
- return read_memory_integer (frame->next->frame + 16, 4) + 20;
-
- /* This is the top frame. Again, use the stack pointer to find
- the address of the sigcontext structure. */
- return read_memory_integer (read_register (SP_REGNUM) + 8, 4) + 20;
+ CORE_ADDR ucontext_addr;
+
+ /* The sigcontext structure is part of the user context. A
+ pointer to the user context is passed as the third argument
+ to the signal handler. */
+ read_memory (sp + 8, buf, 4);
+ ucontext_addr = extract_unsigned_integer (buf, 4, byte_order);
+ return ucontext_addr + I386_LINUX_UCONTEXT_SIGCONTEXT_OFFSET;
+ }
+
+ error (_("Couldn't recognize signal trampoline."));
+ return 0;
+}
+
+/* Set the program counter for process PTID to PC. */
+
+static void
+i386_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
+{
+ regcache_cooked_write_unsigned (regcache, I386_EIP_REGNUM, pc);
+
+ /* We must be careful with modifying the program counter. If we
+ just interrupted a system call, the kernel might try to restart
+ it when we resume the inferior. On restarting the system call,
+ the kernel will try backing up the program counter even though it
+ no longer points at the system call. This typically results in a
+ SIGSEGV or SIGILL. We can prevent this by writing `-1' in the
+ "orig_eax" pseudo-register.
+
+ Note that "orig_eax" is saved when setting up a dummy call frame.
+ This means that it is properly restored when that frame is
+ popped, and that the interrupted system call will be restarted
+ when we resume the inferior on return from a function call from
+ within GDB. In all other cases the system call will not be
+ restarted. */
+ regcache_cooked_write_unsigned (regcache, I386_LINUX_ORIG_EAX_REGNUM, -1);
+}
+
+/* Record all registers but IP register for process-record. */
+
+static int
+i386_all_but_ip_registers_record (struct regcache *regcache)
+{
+ if (record_arch_list_add_reg (regcache, I386_EAX_REGNUM))
+ return -1;
+ if (record_arch_list_add_reg (regcache, I386_ECX_REGNUM))
+ return -1;
+ if (record_arch_list_add_reg (regcache, I386_EDX_REGNUM))
+ return -1;
+ if (record_arch_list_add_reg (regcache, I386_EBX_REGNUM))
+ return -1;
+ if (record_arch_list_add_reg (regcache, I386_ESP_REGNUM))
+ return -1;
+ if (record_arch_list_add_reg (regcache, I386_EBP_REGNUM))
+ return -1;
+ if (record_arch_list_add_reg (regcache, I386_ESI_REGNUM))
+ return -1;
+ if (record_arch_list_add_reg (regcache, I386_EDI_REGNUM))
+ return -1;
+ if (record_arch_list_add_reg (regcache, I386_EFLAGS_REGNUM))
+ return -1;
+
+ return 0;
+}
+
+/* i386_canonicalize_syscall maps from the native i386 Linux set
+ of syscall ids into a canonical set of syscall ids used by
+ process record (a mostly trivial mapping, since the canonical
+ set was originally taken from the i386 set). */
+
+static enum gdb_syscall
+i386_canonicalize_syscall (int syscall)
+{
+ enum { i386_syscall_max = 499 };
+
+ if (syscall <= i386_syscall_max)
+ return syscall;
+ else
+ return -1;
+}
+
+/* Parse the arguments of current system call instruction and record
+ the values of the registers and memory that will be changed into
+ "record_arch_list". This instruction is "int 0x80" (Linux
+ Kernel2.4) or "sysenter" (Linux Kernel 2.6).
+
+ Return -1 if something wrong. */
+
+static struct linux_record_tdep i386_linux_record_tdep;
+
+static int
+i386_linux_intx80_sysenter_record (struct regcache *regcache)
+{
+ int ret;
+ LONGEST syscall_native;
+ enum gdb_syscall syscall_gdb;
+
+ regcache_raw_read_signed (regcache, I386_EAX_REGNUM, &syscall_native);
+
+ syscall_gdb = i386_canonicalize_syscall (syscall_native);
+
+ if (syscall_gdb < 0)
+ {
+ printf_unfiltered (_("Process record and replay target doesn't "
+ "support syscall number %s\n"),
+ plongest (syscall_native));
+ return -1;
}
- error ("Couldn't recognize signal trampoline.");
+ if (syscall_gdb == gdb_sys_sigreturn
+ || syscall_gdb == gdb_sys_rt_sigreturn)
+ {
+ if (i386_all_but_ip_registers_record (regcache))
+ return -1;
+ return 0;
+ }
+
+ ret = record_linux_system_call (syscall_gdb, regcache,
+ &i386_linux_record_tdep);
+ if (ret)
+ return ret;
+
+ /* Record the return value of the system call. */
+ if (record_arch_list_add_reg (regcache, I386_EAX_REGNUM))
+ return -1;
+
return 0;
}
-/* Offset to saved PC in sigcontext, from <asm/sigcontext.h>. */
-#define LINUX_SIGCONTEXT_PC_OFFSET (56)
+#define I386_LINUX_xstate 270
+#define I386_LINUX_frame_size 732
+
+int
+i386_linux_record_signal (struct gdbarch *gdbarch,
+ struct regcache *regcache,
+ enum target_signal signal)
+{
+ ULONGEST esp;
+
+ if (i386_all_but_ip_registers_record (regcache))
+ return -1;
-/* Assuming FRAME is for a Linux sigtramp routine, return the saved
- program counter. */
+ if (record_arch_list_add_reg (regcache, I386_EIP_REGNUM))
+ return -1;
-CORE_ADDR
-i386_linux_sigtramp_saved_pc (struct frame_info *frame)
+ /* Record the change in the stack. */
+ regcache_raw_read_unsigned (regcache, I386_ESP_REGNUM, &esp);
+ /* This is for xstate.
+ sp -= sizeof (struct _fpstate); */
+ esp -= I386_LINUX_xstate;
+ /* This is for frame_size.
+ sp -= sizeof (struct rt_sigframe); */
+ esp -= I386_LINUX_frame_size;
+ if (record_arch_list_add_mem (esp,
+ I386_LINUX_xstate + I386_LINUX_frame_size))
+ return -1;
+
+ if (record_arch_list_add_end ())
+ return -1;
+
+ return 0;
+}
+\f
+
+static LONGEST
+i386_linux_get_syscall_number (struct gdbarch *gdbarch,
+ ptid_t ptid)
{
- CORE_ADDR addr;
- addr = i386_linux_sigcontext_addr (frame);
- return read_memory_integer (addr + LINUX_SIGCONTEXT_PC_OFFSET, 4);
+ struct regcache *regcache = get_thread_regcache (ptid);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ /* The content of a register. */
+ gdb_byte buf[4];
+ /* The result. */
+ LONGEST ret;
+
+ /* Getting the system call number from the register.
+ When dealing with x86 architecture, this information
+ is stored at %eax register. */
+ regcache_cooked_read (regcache, I386_LINUX_ORIG_EAX_REGNUM, buf);
+
+ ret = extract_signed_integer (buf, 4, byte_order);
+
+ return ret;
}
-/* Offset to saved SP in sigcontext, from <asm/sigcontext.h>. */
-#define LINUX_SIGCONTEXT_SP_OFFSET (28)
+/* The register sets used in GNU/Linux ELF core-dumps are identical to
+ the register sets in `struct user' that are used for a.out
+ core-dumps. These are also used by ptrace(2). The corresponding
+ types are `elf_gregset_t' for the general-purpose registers (with
+ `elf_greg_t' the type of a single GP register) and `elf_fpregset_t'
+ for the floating-point registers.
-/* Assuming FRAME is for a Linux sigtramp routine, return the saved
- stack pointer. */
+ Those types used to be available under the names `gregset_t' and
+ `fpregset_t' too, and GDB used those names in the past. But those
+ names are now used for the register sets used in the `mcontext_t'
+ type, which have a different size and layout. */
+
+/* Mapping between the general-purpose registers in `struct user'
+ format and GDB's register cache layout. */
+
+/* From <sys/reg.h>. */
+int i386_linux_gregset_reg_offset[] =
+{
+ 6 * 4, /* %eax */
+ 1 * 4, /* %ecx */
+ 2 * 4, /* %edx */
+ 0 * 4, /* %ebx */
+ 15 * 4, /* %esp */
+ 5 * 4, /* %ebp */
+ 3 * 4, /* %esi */
+ 4 * 4, /* %edi */
+ 12 * 4, /* %eip */
+ 14 * 4, /* %eflags */
+ 13 * 4, /* %cs */
+ 16 * 4, /* %ss */
+ 7 * 4, /* %ds */
+ 8 * 4, /* %es */
+ 9 * 4, /* %fs */
+ 10 * 4, /* %gs */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ 11 * 4 /* "orig_eax" */
+};
+
+/* Mapping between the general-purpose registers in `struct
+ sigcontext' format and GDB's register cache layout. */
+
+/* From <asm/sigcontext.h>. */
+static int i386_linux_sc_reg_offset[] =
+{
+ 11 * 4, /* %eax */
+ 10 * 4, /* %ecx */
+ 9 * 4, /* %edx */
+ 8 * 4, /* %ebx */
+ 7 * 4, /* %esp */
+ 6 * 4, /* %ebp */
+ 5 * 4, /* %esi */
+ 4 * 4, /* %edi */
+ 14 * 4, /* %eip */
+ 16 * 4, /* %eflags */
+ 15 * 4, /* %cs */
+ 18 * 4, /* %ss */
+ 3 * 4, /* %ds */
+ 2 * 4, /* %es */
+ 1 * 4, /* %fs */
+ 0 * 4 /* %gs */
+};
+
+/* Get XSAVE extended state xcr0 from core dump. */
+
+uint64_t
+i386_linux_core_read_xcr0 (struct gdbarch *gdbarch,
+ struct target_ops *target, bfd *abfd)
+{
+ asection *xstate = bfd_get_section_by_name (abfd, ".reg-xstate");
+ uint64_t xcr0;
+
+ if (xstate)
+ {
+ size_t size = bfd_section_size (abfd, xstate);
+
+ /* Check extended state size. */
+ if (size < I386_XSTATE_AVX_SIZE)
+ xcr0 = I386_XSTATE_SSE_MASK;
+ else
+ {
+ char contents[8];
+
+ if (! bfd_get_section_contents (abfd, xstate, contents,
+ I386_LINUX_XSAVE_XCR0_OFFSET,
+ 8))
+ {
+ warning (_("Couldn't read `xcr0' bytes from "
+ "`.reg-xstate' section in core file."));
+ return 0;
+ }
+
+ xcr0 = bfd_get_64 (abfd, contents);
+ }
+ }
+ else
+ xcr0 = 0;
+
+ return xcr0;
+}
+
+/* Get Linux/x86 target description from core dump. */
+
+static const struct target_desc *
+i386_linux_core_read_description (struct gdbarch *gdbarch,
+ struct target_ops *target,
+ bfd *abfd)
+{
+ /* Linux/i386. */
+ uint64_t xcr0 = i386_linux_core_read_xcr0 (gdbarch, target, abfd);
+ switch ((xcr0 & I386_XSTATE_AVX_MASK))
+ {
+ case I386_XSTATE_AVX_MASK:
+ return tdesc_i386_avx_linux;
+ case I386_XSTATE_SSE_MASK:
+ return tdesc_i386_linux;
+ case I386_XSTATE_X87_MASK:
+ return tdesc_i386_mmx_linux;
+ default:
+ break;
+ }
+
+ if (bfd_get_section_by_name (abfd, ".reg-xfp") != NULL)
+ return tdesc_i386_linux;
+ else
+ return tdesc_i386_mmx_linux;
+}
-CORE_ADDR
-i386_linux_sigtramp_saved_sp (struct frame_info *frame)
+static void
+i386_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
- CORE_ADDR addr;
- addr = i386_linux_sigcontext_addr (frame);
- return read_memory_integer (addr + LINUX_SIGCONTEXT_SP_OFFSET, 4);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ const struct target_desc *tdesc = info.target_desc;
+ struct tdesc_arch_data *tdesc_data = (void *) info.tdep_info;
+ const struct tdesc_feature *feature;
+ int valid_p;
+
+ gdb_assert (tdesc_data);
+
+ linux_init_abi (info, gdbarch);
+
+ /* GNU/Linux uses ELF. */
+ i386_elf_init_abi (info, gdbarch);
+
+ /* Reserve a number for orig_eax. */
+ set_gdbarch_num_regs (gdbarch, I386_LINUX_NUM_REGS);
+
+ if (! tdesc_has_registers (tdesc))
+ tdesc = tdesc_i386_linux;
+ tdep->tdesc = tdesc;
+
+ feature = tdesc_find_feature (tdesc, "org.gnu.gdb.i386.linux");
+ if (feature == NULL)
+ return;
+
+ valid_p = tdesc_numbered_register (feature, tdesc_data,
+ I386_LINUX_ORIG_EAX_REGNUM,
+ "orig_eax");
+ if (!valid_p)
+ return;
+
+ /* Add the %orig_eax register used for syscall restarting. */
+ set_gdbarch_write_pc (gdbarch, i386_linux_write_pc);
+
+ tdep->register_reggroup_p = i386_linux_register_reggroup_p;
+
+ tdep->gregset_reg_offset = i386_linux_gregset_reg_offset;
+ tdep->gregset_num_regs = ARRAY_SIZE (i386_linux_gregset_reg_offset);
+ tdep->sizeof_gregset = 17 * 4;
+
+ tdep->jb_pc_offset = 20; /* From <bits/setjmp.h>. */
+
+ tdep->sigtramp_p = i386_linux_sigtramp_p;
+ tdep->sigcontext_addr = i386_linux_sigcontext_addr;
+ tdep->sc_reg_offset = i386_linux_sc_reg_offset;
+ tdep->sc_num_regs = ARRAY_SIZE (i386_linux_sc_reg_offset);
+
+ tdep->xsave_xcr0_offset = I386_LINUX_XSAVE_XCR0_OFFSET;
+
+ set_gdbarch_process_record (gdbarch, i386_process_record);
+ set_gdbarch_process_record_signal (gdbarch, i386_linux_record_signal);
+
+ /* Initialize the i386_linux_record_tdep. */
+ /* These values are the size of the type that will be used in a system
+ call. They are obtained from Linux Kernel source. */
+ i386_linux_record_tdep.size_pointer
+ = gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT;
+ i386_linux_record_tdep.size__old_kernel_stat = 32;
+ i386_linux_record_tdep.size_tms = 16;
+ i386_linux_record_tdep.size_loff_t = 8;
+ i386_linux_record_tdep.size_flock = 16;
+ i386_linux_record_tdep.size_oldold_utsname = 45;
+ i386_linux_record_tdep.size_ustat = 20;
+ i386_linux_record_tdep.size_old_sigaction = 140;
+ i386_linux_record_tdep.size_old_sigset_t = 128;
+ i386_linux_record_tdep.size_rlimit = 8;
+ i386_linux_record_tdep.size_rusage = 72;
+ i386_linux_record_tdep.size_timeval = 8;
+ i386_linux_record_tdep.size_timezone = 8;
+ i386_linux_record_tdep.size_old_gid_t = 2;
+ i386_linux_record_tdep.size_old_uid_t = 2;
+ i386_linux_record_tdep.size_fd_set = 128;
+ i386_linux_record_tdep.size_dirent = 268;
+ i386_linux_record_tdep.size_dirent64 = 276;
+ i386_linux_record_tdep.size_statfs = 64;
+ i386_linux_record_tdep.size_statfs64 = 84;
+ i386_linux_record_tdep.size_sockaddr = 16;
+ i386_linux_record_tdep.size_int
+ = gdbarch_int_bit (gdbarch) / TARGET_CHAR_BIT;
+ i386_linux_record_tdep.size_long
+ = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
+ i386_linux_record_tdep.size_ulong
+ = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
+ i386_linux_record_tdep.size_msghdr = 28;
+ i386_linux_record_tdep.size_itimerval = 16;
+ i386_linux_record_tdep.size_stat = 88;
+ i386_linux_record_tdep.size_old_utsname = 325;
+ i386_linux_record_tdep.size_sysinfo = 64;
+ i386_linux_record_tdep.size_msqid_ds = 88;
+ i386_linux_record_tdep.size_shmid_ds = 84;
+ i386_linux_record_tdep.size_new_utsname = 390;
+ i386_linux_record_tdep.size_timex = 128;
+ i386_linux_record_tdep.size_mem_dqinfo = 24;
+ i386_linux_record_tdep.size_if_dqblk = 68;
+ i386_linux_record_tdep.size_fs_quota_stat = 68;
+ i386_linux_record_tdep.size_timespec = 8;
+ i386_linux_record_tdep.size_pollfd = 8;
+ i386_linux_record_tdep.size_NFS_FHSIZE = 32;
+ i386_linux_record_tdep.size_knfsd_fh = 132;
+ i386_linux_record_tdep.size_TASK_COMM_LEN = 16;
+ i386_linux_record_tdep.size_sigaction = 140;
+ i386_linux_record_tdep.size_sigset_t = 8;
+ i386_linux_record_tdep.size_siginfo_t = 128;
+ i386_linux_record_tdep.size_cap_user_data_t = 12;
+ i386_linux_record_tdep.size_stack_t = 12;
+ i386_linux_record_tdep.size_off_t = i386_linux_record_tdep.size_long;
+ i386_linux_record_tdep.size_stat64 = 96;
+ i386_linux_record_tdep.size_gid_t = 2;
+ i386_linux_record_tdep.size_uid_t = 2;
+ i386_linux_record_tdep.size_PAGE_SIZE = 4096;
+ i386_linux_record_tdep.size_flock64 = 24;
+ i386_linux_record_tdep.size_user_desc = 16;
+ i386_linux_record_tdep.size_io_event = 32;
+ i386_linux_record_tdep.size_iocb = 64;
+ i386_linux_record_tdep.size_epoll_event = 12;
+ i386_linux_record_tdep.size_itimerspec
+ = i386_linux_record_tdep.size_timespec * 2;
+ i386_linux_record_tdep.size_mq_attr = 32;
+ i386_linux_record_tdep.size_siginfo = 128;
+ i386_linux_record_tdep.size_termios = 36;
+ i386_linux_record_tdep.size_termios2 = 44;
+ i386_linux_record_tdep.size_pid_t = 4;
+ i386_linux_record_tdep.size_winsize = 8;
+ i386_linux_record_tdep.size_serial_struct = 60;
+ i386_linux_record_tdep.size_serial_icounter_struct = 80;
+ i386_linux_record_tdep.size_hayes_esp_config = 12;
+ i386_linux_record_tdep.size_size_t = 4;
+ i386_linux_record_tdep.size_iovec = 8;
+
+ /* These values are the second argument of system call "sys_ioctl".
+ They are obtained from Linux Kernel source. */
+ i386_linux_record_tdep.ioctl_TCGETS = 0x5401;
+ i386_linux_record_tdep.ioctl_TCSETS = 0x5402;
+ i386_linux_record_tdep.ioctl_TCSETSW = 0x5403;
+ i386_linux_record_tdep.ioctl_TCSETSF = 0x5404;
+ i386_linux_record_tdep.ioctl_TCGETA = 0x5405;
+ i386_linux_record_tdep.ioctl_TCSETA = 0x5406;
+ i386_linux_record_tdep.ioctl_TCSETAW = 0x5407;
+ i386_linux_record_tdep.ioctl_TCSETAF = 0x5408;
+ i386_linux_record_tdep.ioctl_TCSBRK = 0x5409;
+ i386_linux_record_tdep.ioctl_TCXONC = 0x540A;
+ i386_linux_record_tdep.ioctl_TCFLSH = 0x540B;
+ i386_linux_record_tdep.ioctl_TIOCEXCL = 0x540C;
+ i386_linux_record_tdep.ioctl_TIOCNXCL = 0x540D;
+ i386_linux_record_tdep.ioctl_TIOCSCTTY = 0x540E;
+ i386_linux_record_tdep.ioctl_TIOCGPGRP = 0x540F;
+ i386_linux_record_tdep.ioctl_TIOCSPGRP = 0x5410;
+ i386_linux_record_tdep.ioctl_TIOCOUTQ = 0x5411;
+ i386_linux_record_tdep.ioctl_TIOCSTI = 0x5412;
+ i386_linux_record_tdep.ioctl_TIOCGWINSZ = 0x5413;
+ i386_linux_record_tdep.ioctl_TIOCSWINSZ = 0x5414;
+ i386_linux_record_tdep.ioctl_TIOCMGET = 0x5415;
+ i386_linux_record_tdep.ioctl_TIOCMBIS = 0x5416;
+ i386_linux_record_tdep.ioctl_TIOCMBIC = 0x5417;
+ i386_linux_record_tdep.ioctl_TIOCMSET = 0x5418;
+ i386_linux_record_tdep.ioctl_TIOCGSOFTCAR = 0x5419;
+ i386_linux_record_tdep.ioctl_TIOCSSOFTCAR = 0x541A;
+ i386_linux_record_tdep.ioctl_FIONREAD = 0x541B;
+ i386_linux_record_tdep.ioctl_TIOCINQ = i386_linux_record_tdep.ioctl_FIONREAD;
+ i386_linux_record_tdep.ioctl_TIOCLINUX = 0x541C;
+ i386_linux_record_tdep.ioctl_TIOCCONS = 0x541D;
+ i386_linux_record_tdep.ioctl_TIOCGSERIAL = 0x541E;
+ i386_linux_record_tdep.ioctl_TIOCSSERIAL = 0x541F;
+ i386_linux_record_tdep.ioctl_TIOCPKT = 0x5420;
+ i386_linux_record_tdep.ioctl_FIONBIO = 0x5421;
+ i386_linux_record_tdep.ioctl_TIOCNOTTY = 0x5422;
+ i386_linux_record_tdep.ioctl_TIOCSETD = 0x5423;
+ i386_linux_record_tdep.ioctl_TIOCGETD = 0x5424;
+ i386_linux_record_tdep.ioctl_TCSBRKP = 0x5425;
+ i386_linux_record_tdep.ioctl_TIOCTTYGSTRUCT = 0x5426;
+ i386_linux_record_tdep.ioctl_TIOCSBRK = 0x5427;
+ i386_linux_record_tdep.ioctl_TIOCCBRK = 0x5428;
+ i386_linux_record_tdep.ioctl_TIOCGSID = 0x5429;
+ i386_linux_record_tdep.ioctl_TCGETS2 = 0x802c542a;
+ i386_linux_record_tdep.ioctl_TCSETS2 = 0x402c542b;
+ i386_linux_record_tdep.ioctl_TCSETSW2 = 0x402c542c;
+ i386_linux_record_tdep.ioctl_TCSETSF2 = 0x402c542d;
+ i386_linux_record_tdep.ioctl_TIOCGPTN = 0x80045430;
+ i386_linux_record_tdep.ioctl_TIOCSPTLCK = 0x40045431;
+ i386_linux_record_tdep.ioctl_FIONCLEX = 0x5450;
+ i386_linux_record_tdep.ioctl_FIOCLEX = 0x5451;
+ i386_linux_record_tdep.ioctl_FIOASYNC = 0x5452;
+ i386_linux_record_tdep.ioctl_TIOCSERCONFIG = 0x5453;
+ i386_linux_record_tdep.ioctl_TIOCSERGWILD = 0x5454;
+ i386_linux_record_tdep.ioctl_TIOCSERSWILD = 0x5455;
+ i386_linux_record_tdep.ioctl_TIOCGLCKTRMIOS = 0x5456;
+ i386_linux_record_tdep.ioctl_TIOCSLCKTRMIOS = 0x5457;
+ i386_linux_record_tdep.ioctl_TIOCSERGSTRUCT = 0x5458;
+ i386_linux_record_tdep.ioctl_TIOCSERGETLSR = 0x5459;
+ i386_linux_record_tdep.ioctl_TIOCSERGETMULTI = 0x545A;
+ i386_linux_record_tdep.ioctl_TIOCSERSETMULTI = 0x545B;
+ i386_linux_record_tdep.ioctl_TIOCMIWAIT = 0x545C;
+ i386_linux_record_tdep.ioctl_TIOCGICOUNT = 0x545D;
+ i386_linux_record_tdep.ioctl_TIOCGHAYESESP = 0x545E;
+ i386_linux_record_tdep.ioctl_TIOCSHAYESESP = 0x545F;
+ i386_linux_record_tdep.ioctl_FIOQSIZE = 0x5460;
+
+ /* These values are the second argument of system call "sys_fcntl"
+ and "sys_fcntl64". They are obtained from Linux Kernel source. */
+ i386_linux_record_tdep.fcntl_F_GETLK = 5;
+ i386_linux_record_tdep.fcntl_F_GETLK64 = 12;
+ i386_linux_record_tdep.fcntl_F_SETLK64 = 13;
+ i386_linux_record_tdep.fcntl_F_SETLKW64 = 14;
+
+ i386_linux_record_tdep.arg1 = I386_EBX_REGNUM;
+ i386_linux_record_tdep.arg2 = I386_ECX_REGNUM;
+ i386_linux_record_tdep.arg3 = I386_EDX_REGNUM;
+ i386_linux_record_tdep.arg4 = I386_ESI_REGNUM;
+ i386_linux_record_tdep.arg5 = I386_EDI_REGNUM;
+ i386_linux_record_tdep.arg6 = I386_EBP_REGNUM;
+
+ tdep->i386_intx80_record = i386_linux_intx80_sysenter_record;
+ tdep->i386_sysenter_record = i386_linux_intx80_sysenter_record;
+
+ /* N_FUN symbols in shared libaries have 0 for their values and need
+ to be relocated. */
+ set_gdbarch_sofun_address_maybe_missing (gdbarch, 1);
+
+ /* GNU/Linux uses SVR4-style shared libraries. */
+ set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
+ set_solib_svr4_fetch_link_map_offsets
+ (gdbarch, svr4_ilp32_fetch_link_map_offsets);
+
+ /* GNU/Linux uses the dynamic linker included in the GNU C Library. */
+ set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
+
+ dwarf2_frame_set_signal_frame_p (gdbarch, i386_linux_dwarf_signal_frame_p);
+
+ /* Enable TLS support. */
+ set_gdbarch_fetch_tls_load_module_address (gdbarch,
+ svr4_fetch_objfile_link_map);
+
+ /* Install supported register note sections. */
+ if (tdesc_find_feature (tdesc, "org.gnu.gdb.i386.avx"))
+ set_gdbarch_core_regset_sections (gdbarch, i386_linux_avx_regset_sections);
+ else if (tdesc_find_feature (tdesc, "org.gnu.gdb.i386.sse"))
+ set_gdbarch_core_regset_sections (gdbarch, i386_linux_sse_regset_sections);
+ else
+ set_gdbarch_core_regset_sections (gdbarch, i386_linux_regset_sections);
+
+ set_gdbarch_core_read_description (gdbarch,
+ i386_linux_core_read_description);
+
+ /* Displaced stepping. */
+ set_gdbarch_displaced_step_copy_insn (gdbarch,
+ i386_displaced_step_copy_insn);
+ set_gdbarch_displaced_step_fixup (gdbarch, i386_displaced_step_fixup);
+ set_gdbarch_displaced_step_free_closure (gdbarch,
+ simple_displaced_step_free_closure);
+ set_gdbarch_displaced_step_location (gdbarch,
+ displaced_step_at_entry_point);
+
+ /* Functions for 'catch syscall'. */
+ set_xml_syscall_file_name (XML_SYSCALL_FILENAME_I386);
+ set_gdbarch_get_syscall_number (gdbarch,
+ i386_linux_get_syscall_number);
+
+ set_gdbarch_get_siginfo_type (gdbarch, linux_get_siginfo_type);
}
-/* Immediately after a function call, return the saved pc. */
+/* Provide a prototype to silence -Wmissing-prototypes. */
+extern void _initialize_i386_linux_tdep (void);
-CORE_ADDR
-i386_linux_saved_pc_after_call (struct frame_info *frame)
+void
+_initialize_i386_linux_tdep (void)
{
- if (frame->signal_handler_caller)
- return i386_linux_sigtramp_saved_pc (frame);
+ gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_LINUX,
+ i386_linux_init_abi);
- return read_memory_integer (read_register (SP_REGNUM), 4);
+ /* Initialize the Linux target description. */
+ initialize_tdesc_i386_linux ();
+ initialize_tdesc_i386_mmx_linux ();
+ initialize_tdesc_i386_avx_linux ();
}
projects / deliverable / binutils-gdb.git / blobdiff