X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Famd64-linux-nat.c;h=391a646992b55967b7203399099da7010ea3d5ca;hb=b8162e5ac9e052b2a88912b729081600972e854c;hp=ec0bfb9281206c99953ee10e2f16de61fc82e93c;hpb=50d71875b9128a5782b62998a6a5948f72f5eb93;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/amd64-linux-nat.c b/gdb/amd64-linux-nat.c index ec0bfb9281..391a646992 100644 --- a/gdb/amd64-linux-nat.c +++ b/gdb/amd64-linux-nat.c @@ -1,13 +1,13 @@ /* Native-dependent code for GNU/Linux x86-64. - Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc. + Copyright (C) 2001-2016 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, @@ -16,61 +16,29 @@ 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 . */ #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 -#include -#include -#include +#include "elf/common.h" +#include +#include "nat/gdb_ptrace.h" #include -/* FIXME ezannoni-2003-07-09: we need to be included after - 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 . */ -/* 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 #include -#include "gdb_proc_service.h" - -/* Prototypes for supply_gregset etc. */ #include "gregset.h" +#include "gdb_proc_service.h" +#include "amd64-nat.h" +#include "linux-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. */ - -static int amd64_linux_gregset64_reg_offset[] = -{ - 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 */ -}; - +#include "x86-linux-nat.h" +#include "nat/linux-ptrace.h" +#include "nat/amd64-linux-siginfo.h" /* Mapping between the general-purpose registers in GNU/Linux x86-64 `struct user' format and GDB's register cache layout for GNU/Linux @@ -94,14 +62,13 @@ static int amd64_linux_gregset32_reg_offset[] = -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) */ + 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) /* Transfering the general-purpose registers between GDB, inferiors @@ -111,9 +78,9 @@ static int amd64_linux_gregset32_reg_offset[] = 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 @@ -121,52 +88,21 @@ supply_gregset (elf_gregset_t *gregsetp) do this for all registers. */ void -fill_gregset (elf_gregset_t *gregsetp, int regnum) +fill_gregset (const struct regcache *regcache, + elf_gregset_t *gregsetp, int regnum) { - amd64_collect_native_gregset (current_regcache, gregsetp, regnum); + amd64_collect_native_gregset (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) -{ - 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"); -} - - /* Transfering floating-point registers between GDB, inferiors and cores. */ /* Fill GDB's register cache with the floating-point and SSE register 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 @@ -174,40 +110,10 @@ supply_fpregset (elf_fpregset_t *fpregsetp) -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); } @@ -217,136 +123,121 @@ store_fpregs (int tid, int regnum) this for all registers (including the floating point and SSE registers). */ -void -fetch_inferior_registers (int regnum) +static void +amd64_linux_fetch_inferior_registers (struct target_ops *ops, + struct regcache *regcache, int regnum) { + struct gdbarch *gdbarch = get_regcache_arch (regcache); int tid; /* GNU/Linux LWP ID's are process ID's. */ - tid = TIDGET (inferior_ptid); + tid = ptid_get_lwp (inferior_ptid); if (tid == 0) - tid = PIDGET (inferior_ptid); /* Not a threaded program. */ + tid = ptid_get_pid (inferior_ptid); /* 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; - internal_error (__FILE__, __LINE__, - "Got request for bad register number %d.", regnum); + 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); + } + } } /* Store register REGNUM back into the child process. If REGNUM is -1, do this for all registers (including the floating-point and SSE registers). */ -void -store_inferior_registers (int regnum) +static void +amd64_linux_store_inferior_registers (struct target_ops *ops, + struct regcache *regcache, int regnum) { + struct gdbarch *gdbarch = get_regcache_arch (regcache); int tid; /* GNU/Linux LWP ID's are process ID's. */ - tid = TIDGET (inferior_ptid); + tid = ptid_get_lwp (inferior_ptid); if (tid == 0) - tid = PIDGET (inferior_ptid); /* Not a threaded program. */ + tid = ptid_get_pid (inferior_ptid); /* 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); - if (regnum != -1) - return; - } + elf_gregset_t regs; - if (regnum == -1 || GETFPREGS_SUPPLIES (regnum)) - { - store_fpregs (tid, regnum); - return; - } + if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) + perror_with_name (_("Couldn't get registers")); - internal_error (__FILE__, __LINE__, - "Got request to store bad register number %d.", regnum); -} - + amd64_collect_native_gregset (regcache, ®s, regnum); -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; + if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0) + perror_with_name (_("Couldn't write registers")); - /* 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); + if (regnum != -1) + return; + } - 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"); -} + if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum)) + { + elf_fpregset_t fpregs; -void -amd64_linux_dr_set_control (unsigned long control) -{ - amd64_linux_dr_set (DR_CONTROL, control); -} + if (have_ptrace_getregset == TRIBOOL_TRUE) + { + char xstateregs[X86_XSTATE_MAX_SIZE]; + struct iovec iov; -void -amd64_linux_dr_set_addr (int regnum, CORE_ADDR addr) -{ - gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); + 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_linux_dr_set (DR_FIRSTADDR + regnum, addr); -} + amd64_collect_xsave (regcache, regnum, xstateregs, 0); -void -amd64_linux_dr_reset_addr (int regnum) -{ - gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); + 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_linux_dr_set (DR_FIRSTADDR + regnum, 0L); -} + amd64_collect_fxsave (regcache, regnum, &fpregs); -unsigned long -amd64_linux_dr_get_status (void) -{ - return amd64_linux_dr_get (DR_STATUS); + if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0) + perror_with_name (_("Couldn't write floating point status")); + } + } } @@ -357,28 +248,20 @@ ps_err_e ps_get_thread_area (const struct ps_prochandle *ph, lwpid_t lwpid, int idx, void **base) { - if (gdbarch_ptr_bit (current_gdbarch) == 32) + if (gdbarch_bfd_arch_info (target_gdbarch ())->bits_per_word == 32) { - /* The full structure is found in . The second - integer is the LDT's base_address and that is used to locate - the thread's local storage. See i386-linux-nat.c more - info. */ - unsigned int desc[4]; - - /* This code assumes that "int" is 32 bits and that - GET_THREAD_AREA returns no more than 4 int values. */ - gdb_assert (sizeof (int) == 4); -#ifndef PTRACE_GET_THREAD_AREA -#define PTRACE_GET_THREAD_AREA 25 -#endif - if (ptrace (PTRACE_GET_THREAD_AREA, - lwpid, (void *) (long) idx, (unsigned long) &desc) < 0) - return PS_ERR; - - /* Extend the value to 64 bits. Here it's assumed that a "long" - and a "void *" are the same. */ - (*base) = (void *) (long) desc[1]; - return PS_OK; + 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 { @@ -394,10 +277,39 @@ ps_get_thread_area (const struct ps_prochandle *ph, 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; @@ -409,13 +321,29 @@ ps_get_thread_area (const struct ps_prochandle *ph, } -void -child_post_startup_inferior (ptid_t ptid) +/* Convert a native/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 NATIVE. If DIRECTION is 0, copy from NATIVE to + INF. */ + +static int +amd64_linux_siginfo_fixup (siginfo_t *native, 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 (native, 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 (native, inf, direction, + FIXUP_X32); + else + return 0; } - /* Provide a prototype to silence -Wmissing-prototypes. */ void _initialize_amd64_linux_nat (void); @@ -423,12 +351,26 @@ void _initialize_amd64_linux_nat (void); void _initialize_amd64_linux_nat (void) { + struct target_ops *t; + 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); + + /* Create a generic x86 GNU/Linux target. */ + t = x86_linux_create_target (); + + /* Add our register access methods. */ + t->to_fetch_registers = amd64_linux_fetch_inferior_registers; + t->to_store_registers = amd64_linux_store_inferior_registers; + + /* Add the target. */ + x86_linux_add_target (t); + + /* Add our siginfo layout converter. */ + linux_nat_set_siginfo_fixup (t, amd64_linux_siginfo_fixup); }