/* Native-dependent code for GNU/Linux x86-64.
- Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2001-2018 Free Software Foundation, Inc.
Contributed by Jiri Smid, SuSE Labs.
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 "inferior.h"
-#include "gdbcore.h"
#include "regcache.h"
-#include "linux-nat.h"
-
-#include "gdb_assert.h"
-#include "gdb_string.h"
-#include <sys/ptrace.h>
-#include <sys/debugreg.h>
-#include <sys/syscall.h>
-#include <sys/procfs.h>
+#include "elf/common.h"
+#include <sys/uio.h>
+#include "nat/gdb_ptrace.h"
#include <asm/prctl.h>
-/* FIXME ezannoni-2003-07-09: we need <sys/reg.h> to be included after
- <asm/ptrace.h> because the latter redefines FS and GS for no apparent
- reason, and those definitions don't match the ones that libpthread_db
- uses, which come from <sys/reg.h>. */
-/* ezannoni-2003-07-09: I think this is fixed. The extraneous defs have
- been removed from ptrace.h in the kernel. However, better safe than
- sorry. */
-#include <asm/ptrace.h>
#include <sys/reg.h>
-#include "gdb_proc_service.h"
-
-/* Prototypes for supply_gregset etc. */
#include "gregset.h"
+#include "gdb_proc_service.h"
+#include "amd64-nat.h"
#include "amd64-tdep.h"
#include "amd64-linux-tdep.h"
#include "i386-linux-tdep.h"
-#include "amd64-nat.h"
+#include "x86-xstate.h"
-/* Mapping between the general-purpose registers in GNU/Linux x86-64
- `struct user' format and GDB's register cache layout. */
+#include "x86-linux-nat.h"
+#include "nat/linux-ptrace.h"
+#include "nat/amd64-linux-siginfo.h"
-static int amd64_linux_gregset64_reg_offset[] =
+/* This definition comes from prctl.h. Kernels older than 2.5.64
+ do not have it. */
+#ifndef PTRACE_ARCH_PRCTL
+#define PTRACE_ARCH_PRCTL 30
+#endif
+
+struct amd64_linux_nat_target final : public x86_linux_nat_target
{
- RAX * 8, RBX * 8, /* %rax, %rbx */
- RCX * 8, RDX * 8, /* %rcx, %rdx */
- RSI * 8, RDI * 8, /* %rsi, %rdi */
- RBP * 8, RSP * 8, /* %rbp, %rsp */
- R8 * 8, R9 * 8, /* %r8 ... */
- R10 * 8, R11 * 8,
- R12 * 8, R13 * 8,
- R14 * 8, R15 * 8, /* ... %r15 */
- RIP * 8, EFLAGS * 8, /* %rip, %eflags */
- CS * 8, SS * 8, /* %cs, %ss */
- DS * 8, ES * 8, /* %ds, %es */
- FS * 8, GS * 8 /* %fs, %gs */
+ /* Add our register access methods. */
+ void fetch_registers (struct regcache *, int) override;
+ void store_registers (struct regcache *, int) override;
+
+ bool low_siginfo_fixup (siginfo_t *ptrace, gdb_byte *inf, int direction)
+ override;
};
-\f
+
+static amd64_linux_nat_target the_amd64_linux_nat_target;
/* Mapping between the general-purpose registers in GNU/Linux x86-64
`struct user' format and GDB's register cache layout for GNU/Linux
-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,
- ORIG_RAX * 8 /* "orig_eax" */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -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, /* PKEYS register PKRU */
+ ORIG_RAX * 8 /* "orig_eax" */
};
-
-/* Which ptrace request retrieves which registers?
- These apply to the corresponding SET requests as well. */
-
-#define GETFPREGS_SUPPLIES(regno) \
- (FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM)
\f
/* Transfering the general-purpose registers between GDB, inferiors
in *GREGSETP. */
void
-supply_gregset (elf_gregset_t *gregsetp)
+supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp)
{
- amd64_supply_native_gregset (current_regcache, gregsetp, -1);
+ amd64_supply_native_gregset (regcache, gregsetp, -1);
}
/* Fill register REGNUM (if it is a general-purpose register) in
do this for all registers. */
void
-fill_gregset (elf_gregset_t *gregsetp, int regnum)
-{
- amd64_collect_native_gregset (current_regcache, gregsetp, regnum);
-}
-
-/* Fetch all general-purpose registers from process/thread TID and
- store their values in GDB's register cache. */
-
-static void
-fetch_regs (int tid)
-{
- elf_gregset_t regs;
-
- if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0)
- perror_with_name ("Couldn't get registers");
-
- supply_gregset (®s);
-}
-
-/* Store all valid general-purpose registers in GDB's register cache
- into the process/thread specified by TID. */
-
-static void
-store_regs (int tid, int regnum)
+fill_gregset (const struct regcache *regcache,
+ elf_gregset_t *gregsetp, int regnum)
{
- elf_gregset_t regs;
-
- if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0)
- perror_with_name ("Couldn't get registers");
-
- fill_gregset (®s, regnum);
-
- if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0)
- perror_with_name ("Couldn't write registers");
+ amd64_collect_native_gregset (regcache, gregsetp, regnum);
}
-\f
/* Transfering floating-point registers between GDB, inferiors and cores. */
values in *FPREGSETP. */
void
-supply_fpregset (elf_fpregset_t *fpregsetp)
+supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp)
{
- amd64_supply_fxsave (current_regcache, -1, fpregsetp);
+ amd64_supply_fxsave (regcache, -1, fpregsetp);
}
/* Fill register REGNUM (if it is a floating-point or SSE register) in
-1, do this for all registers. */
void
-fill_fpregset (elf_fpregset_t *fpregsetp, int regnum)
+fill_fpregset (const struct regcache *regcache,
+ elf_fpregset_t *fpregsetp, int regnum)
{
- amd64_fill_fxsave ((char *) fpregsetp, regnum);
-}
-
-/* Fetch all floating-point registers from process/thread TID and store
- thier values in GDB's register cache. */
-
-static void
-fetch_fpregs (int tid)
-{
- elf_fpregset_t fpregs;
-
- if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
- perror_with_name ("Couldn't get floating point status");
-
- supply_fpregset (&fpregs);
-}
-
-/* Store all valid floating-point registers in GDB's register cache
- into the process/thread specified by TID. */
-
-static void
-store_fpregs (int tid, int regnum)
-{
- elf_fpregset_t fpregs;
-
- if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
- perror_with_name ("Couldn't get floating point status");
-
- fill_fpregset (&fpregs, regnum);
-
- if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0)
- perror_with_name ("Couldn't write floating point status");
+ amd64_collect_fxsave (regcache, regnum, fpregsetp);
}
\f
registers). */
void
-fetch_inferior_registers (int regnum)
+amd64_linux_nat_target::fetch_registers (struct regcache *regcache, int regnum)
{
+ struct gdbarch *gdbarch = regcache->arch ();
int tid;
/* GNU/Linux LWP ID's are process ID's. */
- tid = TIDGET (inferior_ptid);
+ tid = regcache->ptid ().lwp ();
if (tid == 0)
- tid = PIDGET (inferior_ptid); /* Not a threaded program. */
+ tid = regcache->ptid ().pid (); /* Not a threaded program. */
- if (regnum == -1 || amd64_native_gregset_supplies_p (regnum))
+ if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
{
- fetch_regs (tid);
+ elf_gregset_t regs;
+
+ if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0)
+ perror_with_name (_("Couldn't get registers"));
+
+ amd64_supply_native_gregset (regcache, ®s, -1);
if (regnum != -1)
return;
}
- if (regnum == -1 || GETFPREGS_SUPPLIES (regnum))
+ if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
{
- fetch_fpregs (tid);
- return;
+ elf_fpregset_t fpregs;
+
+ if (have_ptrace_getregset == TRIBOOL_TRUE)
+ {
+ char xstateregs[X86_XSTATE_MAX_SIZE];
+ struct iovec iov;
+
+ iov.iov_base = xstateregs;
+ iov.iov_len = sizeof (xstateregs);
+ if (ptrace (PTRACE_GETREGSET, tid,
+ (unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
+ perror_with_name (_("Couldn't get extended state status"));
+
+ amd64_supply_xsave (regcache, -1, xstateregs);
+ }
+ else
+ {
+ if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
+ perror_with_name (_("Couldn't get floating point status"));
+
+ amd64_supply_fxsave (regcache, -1, &fpregs);
+ }
+#ifndef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
+ {
+ /* PTRACE_ARCH_PRCTL is obsolete since 2.6.25, where the
+ fs_base and gs_base fields of user_regs_struct can be
+ used directly. */
+ unsigned long base;
+
+ if (regnum == -1 || regnum == AMD64_FSBASE_REGNUM)
+ {
+ if (ptrace (PTRACE_ARCH_PRCTL, tid, &base, ARCH_GET_FS) < 0)
+ perror_with_name (_("Couldn't get segment register fs_base"));
+
+ regcache->raw_supply (AMD64_FSBASE_REGNUM, &base);
+ }
+
+ if (regnum == -1 || regnum == AMD64_GSBASE_REGNUM)
+ {
+ if (ptrace (PTRACE_ARCH_PRCTL, tid, &base, ARCH_GET_GS) < 0)
+ perror_with_name (_("Couldn't get segment register gs_base"));
+
+ regcache->raw_supply (AMD64_GSBASE_REGNUM, &base);
+ }
+ }
+#endif
}
-
- internal_error (__FILE__, __LINE__,
- "Got request for bad register number %d.", regnum);
}
/* Store register REGNUM back into the child process. If REGNUM is
registers). */
void
-store_inferior_registers (int regnum)
+amd64_linux_nat_target::store_registers (struct regcache *regcache, int regnum)
{
+ struct gdbarch *gdbarch = regcache->arch ();
int tid;
/* GNU/Linux LWP ID's are process ID's. */
- tid = TIDGET (inferior_ptid);
+ tid = regcache->ptid ().lwp ();
if (tid == 0)
- tid = PIDGET (inferior_ptid); /* Not a threaded program. */
+ tid = regcache->ptid ().pid (); /* Not a threaded program. */
- if (regnum == -1 || amd64_native_gregset_supplies_p (regnum))
+ if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
{
- store_regs (tid, regnum);
+ elf_gregset_t regs;
+
+ if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0)
+ perror_with_name (_("Couldn't get registers"));
+
+ amd64_collect_native_gregset (regcache, ®s, regnum);
+
+ if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0)
+ perror_with_name (_("Couldn't write registers"));
+
if (regnum != -1)
return;
}
- if (regnum == -1 || GETFPREGS_SUPPLIES (regnum))
+ if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
{
- store_fpregs (tid, regnum);
- return;
+ elf_fpregset_t fpregs;
+
+ if (have_ptrace_getregset == TRIBOOL_TRUE)
+ {
+ char xstateregs[X86_XSTATE_MAX_SIZE];
+ struct iovec iov;
+
+ iov.iov_base = xstateregs;
+ iov.iov_len = sizeof (xstateregs);
+ if (ptrace (PTRACE_GETREGSET, tid,
+ (unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
+ perror_with_name (_("Couldn't get extended state status"));
+
+ amd64_collect_xsave (regcache, regnum, xstateregs, 0);
+
+ if (ptrace (PTRACE_SETREGSET, tid,
+ (unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
+ perror_with_name (_("Couldn't write extended state status"));
+ }
+ else
+ {
+ if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
+ perror_with_name (_("Couldn't get floating point status"));
+
+ amd64_collect_fxsave (regcache, regnum, &fpregs);
+
+ if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0)
+ perror_with_name (_("Couldn't write floating point status"));
+ }
+
+#ifndef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
+ {
+ /* PTRACE_ARCH_PRCTL is obsolete since 2.6.25, where the
+ fs_base and gs_base fields of user_regs_struct can be
+ used directly. */
+ void *base;
+
+ if (regnum == -1 || regnum == AMD64_FSBASE_REGNUM)
+ {
+ regcache->raw_collect (AMD64_FSBASE_REGNUM, &base);
+
+ if (ptrace (PTRACE_ARCH_PRCTL, tid, base, ARCH_SET_FS) < 0)
+ perror_with_name (_("Couldn't write segment register fs_base"));
+ }
+ if (regnum == -1 || regnum == AMD64_GSBASE_REGNUM)
+ {
+
+ regcache->raw_collect (AMD64_GSBASE_REGNUM, &base);
+ if (ptrace (PTRACE_ARCH_PRCTL, tid, base, ARCH_SET_GS) < 0)
+ perror_with_name (_("Couldn't write segment register gs_base"));
+ }
+ }
+#endif
}
-
- internal_error (__FILE__, __LINE__,
- "Got request to store bad register number %d.", regnum);
}
\f
-static unsigned long
-amd64_linux_dr_get (int regnum)
-{
- int tid;
- unsigned long value;
-
- /* FIXME: kettenis/2001-01-29: It's not clear what we should do with
- multi-threaded processes here. For now, pretend there is just
- one thread. */
- tid = PIDGET (inferior_ptid);
-
- /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the
- ptrace call fails breaks debugging remote targets. The correct
- way to fix this is to add the hardware breakpoint and watchpoint
- stuff to the target vectore. For now, just return zero if the
- ptrace call fails. */
- errno = 0;
- value = ptrace (PT_READ_U, tid,
- offsetof (struct user, u_debugreg[regnum]), 0);
- if (errno != 0)
-#if 0
- perror_with_name ("Couldn't read debug register");
-#else
- return 0;
-#endif
-
- return value;
-}
-
-static void
-amd64_linux_dr_set (int regnum, unsigned long value)
-{
- int tid;
-
- /* FIXME: kettenis/2001-01-29: It's not clear what we should do with
- multi-threaded processes here. For now, pretend there is just
- one thread. */
- tid = PIDGET (inferior_ptid);
-
- errno = 0;
- ptrace (PT_WRITE_U, tid, offsetof (struct user, u_debugreg[regnum]), value);
- if (errno != 0)
- perror_with_name ("Couldn't write debug register");
-}
-
-void
-amd64_linux_dr_set_control (unsigned long control)
-{
- amd64_linux_dr_set (DR_CONTROL, control);
-}
-
-void
-amd64_linux_dr_set_addr (int regnum, CORE_ADDR addr)
-{
- gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
-
- amd64_linux_dr_set (DR_FIRSTADDR + regnum, addr);
-}
-
-void
-amd64_linux_dr_reset_addr (int regnum)
-{
- gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
-
- amd64_linux_dr_set (DR_FIRSTADDR + regnum, 0L);
-}
-
-unsigned long
-amd64_linux_dr_get_status (void)
-{
- return amd64_linux_dr_get (DR_STATUS);
-}
-\f
+/* This function is called by libthread_db as part of its handling of
+ a request for a thread's local storage address. */
ps_err_e
-ps_get_thread_area (const struct ps_prochandle *ph,
+ps_get_thread_area (struct ps_prochandle *ph,
lwpid_t lwpid, int idx, void **base)
{
-/* This definition comes from prctl.h, but some kernels may not have it. */
-#ifndef PTRACE_ARCH_PRCTL
-#define PTRACE_ARCH_PRCTL 30
-#endif
-
- /* FIXME: ezannoni-2003-07-09 see comment above about include file order.
- We could be getting bogus values for these two. */
- gdb_assert (FS < ELF_NGREG);
- gdb_assert (GS < ELF_NGREG);
- switch (idx)
+ if (gdbarch_bfd_arch_info (target_gdbarch ())->bits_per_word == 32)
+ {
+ unsigned int base_addr;
+ ps_err_e result;
+
+ result = x86_linux_get_thread_area (lwpid, (void *) (long) idx,
+ &base_addr);
+ if (result == PS_OK)
+ {
+ /* Extend the value to 64 bits. Here it's assumed that
+ a "long" and a "void *" are the same. */
+ (*base) = (void *) (long) base_addr;
+ }
+ return result;
+ }
+ else
{
- case FS:
- if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0)
- return PS_OK;
- break;
- case GS:
- if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0)
- return PS_OK;
- break;
- default: /* Should not happen. */
- return PS_BADADDR;
+
+ /* FIXME: ezannoni-2003-07-09 see comment above about include
+ file order. We could be getting bogus values for these two. */
+ gdb_assert (FS < ELF_NGREG);
+ gdb_assert (GS < ELF_NGREG);
+ switch (idx)
+ {
+ case FS:
+#ifdef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
+ {
+ /* PTRACE_ARCH_PRCTL is obsolete since 2.6.25, where the
+ fs_base and gs_base fields of user_regs_struct can be
+ used directly. */
+ unsigned long fs;
+ errno = 0;
+ fs = ptrace (PTRACE_PEEKUSER, lwpid,
+ offsetof (struct user_regs_struct, fs_base), 0);
+ if (errno == 0)
+ {
+ *base = (void *) fs;
+ return PS_OK;
+ }
+ }
+#endif
+ if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0)
+ return PS_OK;
+ break;
+ case GS:
+#ifdef HAVE_STRUCT_USER_REGS_STRUCT_GS_BASE
+ {
+ unsigned long gs;
+ errno = 0;
+ gs = ptrace (PTRACE_PEEKUSER, lwpid,
+ offsetof (struct user_regs_struct, gs_base), 0);
+ if (errno == 0)
+ {
+ *base = (void *) gs;
+ return PS_OK;
+ }
+ }
+#endif
+ if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0)
+ return PS_OK;
+ break;
+ default: /* Should not happen. */
+ return PS_BADADDR;
+ }
}
return PS_ERR; /* ptrace failed. */
}
\f
-void
-child_post_startup_inferior (ptid_t ptid)
+/* Convert a ptrace/host siginfo object, into/from the siginfo in the
+ layout of the inferiors' architecture. Returns true if any
+ conversion was done; false otherwise. If DIRECTION is 1, then copy
+ from INF to PTRACE. If DIRECTION is 0, copy from PTRACE to
+ INF. */
+
+bool
+amd64_linux_nat_target::low_siginfo_fixup (siginfo_t *ptrace,
+ gdb_byte *inf,
+ int direction)
{
- i386_cleanup_dregs ();
- linux_child_post_startup_inferior (ptid);
+ struct gdbarch *gdbarch = get_frame_arch (get_current_frame ());
+
+ /* Is the inferior 32-bit? If so, then do fixup the siginfo
+ object. */
+ if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32)
+ return amd64_linux_siginfo_fixup_common (ptrace, inf, direction,
+ FIXUP_32);
+ /* No fixup for native x32 GDB. */
+ else if (gdbarch_addr_bit (gdbarch) == 32 && sizeof (void *) == 8)
+ return amd64_linux_siginfo_fixup_common (ptrace, inf, direction,
+ FIXUP_X32);
+ else
+ return false;
}
-\f
-
-/* Provide a prototype to silence -Wmissing-prototypes. */
-void _initialize_amd64_linux_nat (void);
void
_initialize_amd64_linux_nat (void)
{
amd64_native_gregset32_reg_offset = amd64_linux_gregset32_reg_offset;
amd64_native_gregset32_num_regs = I386_LINUX_NUM_REGS;
- amd64_native_gregset64_reg_offset = amd64_linux_gregset64_reg_offset;
+ amd64_native_gregset64_reg_offset = amd64_linux_gregset_reg_offset;
+ amd64_native_gregset64_num_regs = AMD64_LINUX_NUM_REGS;
gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset)
== amd64_native_gregset32_num_regs);
- gdb_assert (ARRAY_SIZE (amd64_linux_gregset64_reg_offset)
- == amd64_native_gregset64_num_regs);
+
+ linux_target = &the_amd64_linux_nat_target;
+
+ /* Add the target. */
+ add_inf_child_target (linux_target);
}
projects / deliverable / binutils-gdb.git / blobdiff