/* Target-dependent code for GNU/Linux i386.
- Copyright (C) 2000-2005, 2007-2012 Free Software Foundation, Inc.
+ Copyright (C) 2000-2020 Free Software Foundation, Inc.
This file is part of GDB.
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
+#include "displaced-stepping.h"
#include "gdbcore.h"
#include "frame.h"
#include "value.h"
#include "inferior.h"
#include "osabi.h"
#include "reggroups.h"
-#include "dwarf2-frame.h"
-#include "gdb_string.h"
-
+#include "dwarf2/frame.h"
#include "i386-tdep.h"
#include "i386-linux-tdep.h"
#include "linux-tdep.h"
+#include "utils.h"
#include "glibc-tdep.h"
#include "solib-svr4.h"
#include "symtab.h"
#include "arch-utils.h"
#include "xml-syscall.h"
+#include "infrun.h"
#include "i387-tdep.h"
-#include "i386-xstate.h"
+#include "gdbsupport/x86-xstate.h"
/* The syscall's XML filename for i386. */
#define XML_SYSCALL_FILENAME_I386 "syscalls/i386-linux.xml"
-#include "record.h"
+#include "record-full.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 }
-};
+#include "arch/i386.h"
+#include "target-descriptions.h"
/* 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_all_but_ip_registers_record (struct regcache *regcache)
{
- if (record_arch_list_add_reg (regcache, I386_EAX_REGNUM))
+ if (record_full_arch_list_add_reg (regcache, I386_EAX_REGNUM))
return -1;
- if (record_arch_list_add_reg (regcache, I386_ECX_REGNUM))
+ if (record_full_arch_list_add_reg (regcache, I386_ECX_REGNUM))
return -1;
- if (record_arch_list_add_reg (regcache, I386_EDX_REGNUM))
+ if (record_full_arch_list_add_reg (regcache, I386_EDX_REGNUM))
return -1;
- if (record_arch_list_add_reg (regcache, I386_EBX_REGNUM))
+ if (record_full_arch_list_add_reg (regcache, I386_EBX_REGNUM))
return -1;
- if (record_arch_list_add_reg (regcache, I386_ESP_REGNUM))
+ if (record_full_arch_list_add_reg (regcache, I386_ESP_REGNUM))
return -1;
- if (record_arch_list_add_reg (regcache, I386_EBP_REGNUM))
+ if (record_full_arch_list_add_reg (regcache, I386_EBP_REGNUM))
return -1;
- if (record_arch_list_add_reg (regcache, I386_ESI_REGNUM))
+ if (record_full_arch_list_add_reg (regcache, I386_ESI_REGNUM))
return -1;
- if (record_arch_list_add_reg (regcache, I386_EDI_REGNUM))
+ if (record_full_arch_list_add_reg (regcache, I386_EDI_REGNUM))
return -1;
- if (record_arch_list_add_reg (regcache, I386_EFLAGS_REGNUM))
+ if (record_full_arch_list_add_reg (regcache, I386_EFLAGS_REGNUM))
return -1;
return 0;
enum { i386_syscall_max = 499 };
if (syscall <= i386_syscall_max)
- return syscall;
+ return (enum gdb_syscall) syscall;
else
- return -1;
+ return gdb_sys_no_syscall;
+}
+
+/* Value of the sigcode in case of a boundary fault. */
+
+#define SIG_CODE_BONDARY_FAULT 3
+
+/* i386 GNU/Linux implementation of the handle_segmentation_fault
+ gdbarch hook. Displays information related to MPX bound
+ violations. */
+void
+i386_linux_handle_segmentation_fault (struct gdbarch *gdbarch,
+ struct ui_out *uiout)
+{
+ /* -Wmaybe-uninitialized */
+ CORE_ADDR lower_bound = 0, upper_bound = 0, access = 0;
+ int is_upper;
+ long sig_code = 0;
+
+ if (!i386_mpx_enabled ())
+ return;
+
+ try
+ {
+ /* Sigcode evaluates if the actual segfault is a boundary violation. */
+ sig_code = parse_and_eval_long ("$_siginfo.si_code\n");
+
+ lower_bound
+ = parse_and_eval_long ("$_siginfo._sifields._sigfault._addr_bnd._lower");
+ upper_bound
+ = parse_and_eval_long ("$_siginfo._sifields._sigfault._addr_bnd._upper");
+ access
+ = parse_and_eval_long ("$_siginfo._sifields._sigfault.si_addr");
+ }
+ catch (const gdb_exception &exception)
+ {
+ return;
+ }
+
+ /* If this is not a boundary violation just return. */
+ if (sig_code != SIG_CODE_BONDARY_FAULT)
+ return;
+
+ is_upper = (access > upper_bound ? 1 : 0);
+
+ uiout->text ("\n");
+ if (is_upper)
+ uiout->field_string ("sigcode-meaning", _("Upper bound violation"));
+ else
+ uiout->field_string ("sigcode-meaning", _("Lower bound violation"));
+
+ uiout->text (_(" while accessing address "));
+ uiout->field_core_addr ("bound-access", gdbarch, access);
+
+ uiout->text (_("\nBounds: [lower = "));
+ uiout->field_core_addr ("lower-bound", gdbarch, lower_bound);
+
+ uiout->text (_(", upper = "));
+ uiout->field_core_addr ("upper-bound", gdbarch, upper_bound);
+
+ uiout->text (_("]"));
}
/* Parse the arguments of current system call instruction and record
return ret;
/* Record the return value of the system call. */
- if (record_arch_list_add_reg (regcache, I386_EAX_REGNUM))
+ if (record_full_arch_list_add_reg (regcache, I386_EAX_REGNUM))
return -1;
return 0;
#define I386_LINUX_xstate 270
#define I386_LINUX_frame_size 732
-int
+static int
i386_linux_record_signal (struct gdbarch *gdbarch,
struct regcache *regcache,
- enum target_signal signal)
+ enum gdb_signal signal)
{
ULONGEST esp;
if (i386_all_but_ip_registers_record (regcache))
return -1;
- if (record_arch_list_add_reg (regcache, I386_EIP_REGNUM))
+ if (record_full_arch_list_add_reg (regcache, I386_EIP_REGNUM))
return -1;
/* Record the change in the stack. */
/* 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))
+ if (record_full_arch_list_add_mem (esp,
+ I386_LINUX_xstate + I386_LINUX_frame_size))
return -1;
- if (record_arch_list_add_end ())
+ if (record_full_arch_list_add_end ())
return -1;
return 0;
}
\f
+/* Core of the implementation for gdbarch get_syscall_number. Get pending
+ syscall number from REGCACHE. If there is no pending syscall -1 will be
+ returned. Pending syscall means ptrace has stepped into the syscall but
+ another ptrace call will step out. PC is right after the int $0x80
+ / syscall / sysenter instruction in both cases, PC does not change during
+ the second ptrace step. */
+
static LONGEST
-i386_linux_get_syscall_number (struct gdbarch *gdbarch,
- ptid_t ptid)
+i386_linux_get_syscall_number_from_regcache (struct regcache *regcache)
{
- struct regcache *regcache = get_thread_regcache (ptid);
+ struct gdbarch *gdbarch = regcache->arch ();
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
/* The content of a register. */
gdb_byte buf[4];
/* 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);
+ regcache->cooked_read (I386_LINUX_ORIG_EAX_REGNUM, buf);
ret = extract_signed_integer (buf, 4, byte_order);
return ret;
}
+/* Wrapper for i386_linux_get_syscall_number_from_regcache to make it
+ compatible with gdbarch get_syscall_number method prototype. */
+
+static LONGEST
+i386_linux_get_syscall_number (struct gdbarch *gdbarch,
+ thread_info *thread)
+{
+ struct regcache *regcache = get_thread_regcache (thread);
+
+ return i386_linux_get_syscall_number_from_regcache (regcache);
+}
+
/* 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
-1, -1, -1, -1, -1, -1, -1, -1,
-1,
-1, -1, -1, -1, -1, -1, -1, -1,
- 11 * 4 /* "orig_eax" */
+ -1, -1, -1, -1, /* MPX registers BND0 ... BND3. */
+ -1, -1, /* MPX registers BNDCFGU, BNDSTATUS. */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* k0 ... k7 (AVX512) */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* zmm0 ... zmm7 (AVX512) */
+ -1, /* PKRU register */
+ 11 * 4, /* "orig_eax" */
};
/* Mapping between the general-purpose registers in `struct
/* Get XSAVE extended state xcr0 from core dump. */
uint64_t
-i386_linux_core_read_xcr0 (struct gdbarch *gdbarch,
- struct target_ops *target, bfd *abfd)
+i386_linux_core_read_xcr0 (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);
+ size_t size = bfd_section_size (xstate);
/* Check extended state size. */
- if (size < I386_XSTATE_AVX_SIZE)
- xcr0 = I386_XSTATE_SSE_MASK;
+ if (size < X86_XSTATE_AVX_SIZE)
+ xcr0 = X86_XSTATE_SSE_MASK;
else
{
char contents[8];
return xcr0;
}
+/* See i386-linux-tdep.h. */
+
+const struct target_desc *
+i386_linux_read_description (uint64_t xcr0)
+{
+ if (xcr0 == 0)
+ return NULL;
+
+ static struct target_desc *i386_linux_tdescs \
+ [2/*X87*/][2/*SSE*/][2/*AVX*/][2/*MPX*/][2/*AVX512*/][2/*PKRU*/] = {};
+ struct target_desc **tdesc;
+
+ tdesc = &i386_linux_tdescs[(xcr0 & X86_XSTATE_X87) ? 1 : 0]
+ [(xcr0 & X86_XSTATE_SSE) ? 1 : 0]
+ [(xcr0 & X86_XSTATE_AVX) ? 1 : 0]
+ [(xcr0 & X86_XSTATE_MPX) ? 1 : 0]
+ [(xcr0 & X86_XSTATE_AVX512) ? 1 : 0]
+ [(xcr0 & X86_XSTATE_PKRU) ? 1 : 0];
+
+ if (*tdesc == NULL)
+ *tdesc = i386_create_target_description (xcr0, true, false);
+
+ return *tdesc;
+}
+
/* Get Linux/x86 target description from core dump. */
static const struct target_desc *
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;
- }
+ uint64_t xcr0 = i386_linux_core_read_xcr0 (abfd);
+ const struct target_desc *tdesc = i386_linux_read_description (xcr0);
+
+ if (tdesc != NULL)
+ return tdesc;
if (bfd_get_section_by_name (abfd, ".reg-xfp") != NULL)
- return tdesc_i386_linux;
+ return i386_linux_read_description (X86_XSTATE_SSE_MASK);
+ else
+ return i386_linux_read_description (X86_XSTATE_X87_MASK);
+}
+
+/* Similar to i386_supply_fpregset, but use XSAVE extended state. */
+
+static void
+i386_linux_supply_xstateregset (const struct regset *regset,
+ struct regcache *regcache, int regnum,
+ const void *xstateregs, size_t len)
+{
+ i387_supply_xsave (regcache, regnum, xstateregs);
+}
+
+struct type *
+x86_linux_get_siginfo_type (struct gdbarch *gdbarch)
+{
+ return linux_get_siginfo_type_with_fields (gdbarch, LINUX_SIGINFO_FIELD_ADDR_BND);
+}
+
+/* Similar to i386_collect_fpregset, but use XSAVE extended state. */
+
+static void
+i386_linux_collect_xstateregset (const struct regset *regset,
+ const struct regcache *regcache,
+ int regnum, void *xstateregs, size_t len)
+{
+ i387_collect_xsave (regcache, regnum, xstateregs, 1);
+}
+
+/* Register set definitions. */
+
+static const struct regset i386_linux_xstateregset =
+ {
+ NULL,
+ i386_linux_supply_xstateregset,
+ i386_linux_collect_xstateregset
+ };
+
+/* Iterate over core file register note sections. */
+
+static void
+i386_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
+ iterate_over_regset_sections_cb *cb,
+ void *cb_data,
+ const struct regcache *regcache)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ cb (".reg", 68, 68, &i386_gregset, NULL, cb_data);
+
+ if (tdep->xcr0 & X86_XSTATE_AVX)
+ cb (".reg-xstate", X86_XSTATE_SIZE (tdep->xcr0),
+ X86_XSTATE_SIZE (tdep->xcr0), &i386_linux_xstateregset,
+ "XSAVE extended state", cb_data);
+ else if (tdep->xcr0 & X86_XSTATE_SSE)
+ cb (".reg-xfp", 512, 512, &i386_fpregset, "extended floating-point",
+ cb_data);
else
- return tdesc_i386_mmx_linux;
+ cb (".reg2", 108, 108, &i386_fpregset, NULL, cb_data);
+}
+
+/* Linux kernel shows PC value after the 'int $0x80' instruction even if
+ inferior is still inside the syscall. On next PTRACE_SINGLESTEP it will
+ finish the syscall but PC will not change.
+
+ Some vDSOs contain 'int $0x80; ret' and during stepping out of the syscall
+ i386_displaced_step_fixup would keep PC at the displaced pad location.
+ As PC is pointing to the 'ret' instruction before the step
+ i386_displaced_step_fixup would expect inferior has just executed that 'ret'
+ and PC should not be adjusted. In reality it finished syscall instead and
+ PC should get relocated back to its vDSO address. Hide the 'ret'
+ instruction by 'nop' so that i386_displaced_step_fixup is not confused.
+
+ It is not fully correct as the bytes in struct displaced_step_copy_insn_closure will
+ not match the inferior code. But we would need some new flag in
+ displaced_step_copy_insn_closure otherwise to keep the state that syscall is finishing
+ for the later i386_displaced_step_fixup execution as the syscall execution
+ is already no longer detectable there. The new flag field would mean
+ i386-linux-tdep.c needs to wrap all the displacement methods of i386-tdep.c
+ which does not seem worth it. The same effect is achieved by patching that
+ 'nop' instruction there instead. */
+
+static displaced_step_copy_insn_closure_up
+i386_linux_displaced_step_copy_insn (struct gdbarch *gdbarch,
+ CORE_ADDR from, CORE_ADDR to,
+ struct regcache *regs)
+{
+ displaced_step_copy_insn_closure_up closure_
+ = i386_displaced_step_copy_insn (gdbarch, from, to, regs);
+
+ if (i386_linux_get_syscall_number_from_regcache (regs) != -1)
+ {
+ /* The closure returned by i386_displaced_step_copy_insn is simply a
+ buffer with a copy of the instruction. */
+ i386_displaced_step_copy_insn_closure *closure
+ = (i386_displaced_step_copy_insn_closure *) closure_.get ();
+
+ /* Fake nop. */
+ closure->buf[0] = 0x90;
+ }
+
+ return closure_;
+}
+
+static displaced_step_prepare_status
+i386_displaced_step_prepare (gdbarch *arch, thread_info *thread)
+{
+ gdb_assert (false);
+ return DISPLACED_STEP_PREPARE_STATUS_OK;
+}
+
+static displaced_step_finish_status
+i386_displaced_step_finish (gdbarch *arch, thread_info *thread, gdb_signal sig)
+{
+ gdb_assert (false);
+ return DISPLACED_STEP_FINISH_STATUS_OK;
}
static void
{
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;
+ struct tdesc_arch_data *tdesc_data = info.tdesc_data;
const struct tdesc_feature *feature;
int valid_p;
set_gdbarch_num_regs (gdbarch, I386_LINUX_NUM_REGS);
if (! tdesc_has_registers (tdesc))
- tdesc = tdesc_i386_linux;
+ tdesc = i386_linux_read_description (X86_XSTATE_SSE_MASK);
tdep->tdesc = tdesc;
feature = tdesc_find_feature (tdesc, "org.gnu.gdb.i386.linux");
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_old_sigaction = 16;
+ i386_linux_record_tdep.size_old_sigset_t = 4;
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_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_old_dirent = 268;
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_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_sigaction = 20;
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_gid_t = 4;
+ i386_linux_record_tdep.size_uid_t = 4;
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_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_hayes_esp_config = 12;
i386_linux_record_tdep.size_size_t = 4;
i386_linux_record_tdep.size_iovec = 8;
+ i386_linux_record_tdep.size_time_t = 4;
/* These values are the second argument of system call "sys_ioctl".
They are obtained from Linux Kernel source. */
tdep->i386_sysenter_record = i386_linux_intx80_sysenter_syscall_record;
tdep->i386_syscall_record = i386_linux_intx80_sysenter_syscall_record;
- /* N_FUN symbols in shared libaries have 0 for their values and need
+ /* N_FUN symbols in shared libraries have 0 for their values and need
to be relocated. */
set_gdbarch_sofun_address_maybe_missing (gdbarch, 1);
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);
-
+ /* Core file support. */
+ set_gdbarch_iterate_over_regset_sections
+ (gdbarch, i386_linux_iterate_over_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);
+ i386_linux_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);
+ set_gdbarch_displaced_step_prepare (gdbarch, i386_displaced_step_prepare);
+ set_gdbarch_displaced_step_finish (gdbarch, i386_displaced_step_finish);
/* Functions for 'catch syscall'. */
- set_xml_syscall_file_name (XML_SYSCALL_FILENAME_I386);
+ set_xml_syscall_file_name (gdbarch, 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);
+ set_gdbarch_get_siginfo_type (gdbarch, x86_linux_get_siginfo_type);
+ set_gdbarch_handle_segmentation_fault (gdbarch,
+ i386_linux_handle_segmentation_fault);
}
-/* Provide a prototype to silence -Wmissing-prototypes. */
-extern void _initialize_i386_linux_tdep (void);
-
+void _initialize_i386_linux_tdep ();
void
-_initialize_i386_linux_tdep (void)
+_initialize_i386_linux_tdep ()
{
gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_LINUX,
i386_linux_init_abi);
-
- /* 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