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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.2/] [gdb/] [i386-linux-nat.c] - Rev 527
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/* Native-dependent code for GNU/Linux i386. Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 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 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 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, see <http://www.gnu.org/licenses/>. */ #include "defs.h" #include "i386-nat.h" #include "inferior.h" #include "gdbcore.h" #include "regcache.h" #include "regset.h" #include "target.h" #include "linux-nat.h" #include "gdb_assert.h" #include "gdb_string.h" #include "elf/common.h" #include <sys/uio.h> #include <sys/ptrace.h> #include <sys/user.h> #include <sys/procfs.h> #ifdef HAVE_SYS_REG_H #include <sys/reg.h> #endif #ifndef ORIG_EAX #define ORIG_EAX -1 #endif #ifdef HAVE_SYS_DEBUGREG_H #include <sys/debugreg.h> #endif #ifndef DR_FIRSTADDR #define DR_FIRSTADDR 0 #endif #ifndef DR_LASTADDR #define DR_LASTADDR 3 #endif #ifndef DR_STATUS #define DR_STATUS 6 #endif #ifndef DR_CONTROL #define DR_CONTROL 7 #endif /* Prototypes for supply_gregset etc. */ #include "gregset.h" #include "i387-tdep.h" #include "i386-tdep.h" #include "i386-linux-tdep.h" /* Defines ps_err_e, struct ps_prochandle. */ #include "gdb_proc_service.h" #include "i386-xstate.h" #ifndef PTRACE_GETREGSET #define PTRACE_GETREGSET 0x4204 #endif #ifndef PTRACE_SETREGSET #define PTRACE_SETREGSET 0x4205 #endif /* Does the current host support PTRACE_GETREGSET? */ static int have_ptrace_getregset = -1; /* The register sets used in GNU/Linux ELF core-dumps are identical to the register sets in `struct user' that is used for a.out core-dumps, and is also used by `ptrace'. 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. Those types used to be available under the names `gregset_t' and `fpregset_t' too, and this file used those names in the past. But those names are now used for the register sets used in the `mcontext_t' type, and have a different size and layout. */ /* Which ptrace request retrieves which registers? These apply to the corresponding SET requests as well. */ #define GETREGS_SUPPLIES(regno) \ ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM) #define GETFPXREGS_SUPPLIES(regno) \ (I386_ST0_REGNUM <= (regno) && (regno) < I386_SSE_NUM_REGS) #define GETXSTATEREGS_SUPPLIES(regno) \ (I386_ST0_REGNUM <= (regno) && (regno) < I386_AVX_NUM_REGS) /* Does the current host support the GETREGS request? */ int have_ptrace_getregs = #ifdef HAVE_PTRACE_GETREGS 1 #else 0 #endif ; /* Does the current host support the GETFPXREGS request? The header file may or may not define it, and even if it is defined, the kernel will return EIO if it's running on a pre-SSE processor. My instinct is to attach this to some architecture- or target-specific data structure, but really, a particular GDB process can only run on top of one kernel at a time. So it's okay for this to be a simple variable. */ int have_ptrace_getfpxregs = #ifdef HAVE_PTRACE_GETFPXREGS -1 #else 0 #endif ; /* Accessing registers through the U area, one at a time. */ /* Fetch one register. */ static void fetch_register (struct regcache *regcache, int regno) { int tid; int val; gdb_assert (!have_ptrace_getregs); if (i386_linux_gregset_reg_offset[regno] == -1) { regcache_raw_supply (regcache, regno, NULL); return; } /* GNU/Linux LWP ID's are process ID's. */ tid = TIDGET (inferior_ptid); if (tid == 0) tid = PIDGET (inferior_ptid); /* Not a threaded program. */ errno = 0; val = ptrace (PTRACE_PEEKUSER, tid, i386_linux_gregset_reg_offset[regno], 0); if (errno != 0) error (_("Couldn't read register %s (#%d): %s."), gdbarch_register_name (get_regcache_arch (regcache), regno), regno, safe_strerror (errno)); regcache_raw_supply (regcache, regno, &val); } /* Store one register. */ static void store_register (const struct regcache *regcache, int regno) { int tid; int val; gdb_assert (!have_ptrace_getregs); if (i386_linux_gregset_reg_offset[regno] == -1) return; /* GNU/Linux LWP ID's are process ID's. */ tid = TIDGET (inferior_ptid); if (tid == 0) tid = PIDGET (inferior_ptid); /* Not a threaded program. */ errno = 0; regcache_raw_collect (regcache, regno, &val); ptrace (PTRACE_POKEUSER, tid, i386_linux_gregset_reg_offset[regno], val); if (errno != 0) error (_("Couldn't write register %s (#%d): %s."), gdbarch_register_name (get_regcache_arch (regcache), regno), regno, safe_strerror (errno)); } /* Transfering the general-purpose registers between GDB, inferiors and core files. */ /* Fill GDB's register array with the general-purpose register values in *GREGSETP. */ void supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp) { const gdb_byte *regp = (const gdb_byte *) gregsetp; int i; for (i = 0; i < I386_NUM_GREGS; i++) regcache_raw_supply (regcache, i, regp + i386_linux_gregset_reg_offset[i]); if (I386_LINUX_ORIG_EAX_REGNUM < gdbarch_num_regs (get_regcache_arch (regcache))) regcache_raw_supply (regcache, I386_LINUX_ORIG_EAX_REGNUM, regp + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]); } /* Fill register REGNO (if it is a general-purpose register) in *GREGSETPS with the value in GDB's register array. If REGNO is -1, do this for all registers. */ void fill_gregset (const struct regcache *regcache, elf_gregset_t *gregsetp, int regno) { gdb_byte *regp = (gdb_byte *) gregsetp; int i; for (i = 0; i < I386_NUM_GREGS; i++) if (regno == -1 || regno == i) regcache_raw_collect (regcache, i, regp + i386_linux_gregset_reg_offset[i]); if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM) && I386_LINUX_ORIG_EAX_REGNUM < gdbarch_num_regs (get_regcache_arch (regcache))) regcache_raw_collect (regcache, I386_LINUX_ORIG_EAX_REGNUM, regp + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]); } #ifdef HAVE_PTRACE_GETREGS /* Fetch all general-purpose registers from process/thread TID and store their values in GDB's register array. */ static void fetch_regs (struct regcache *regcache, int tid) { elf_gregset_t regs; elf_gregset_t *regs_p = ®s; if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) { if (errno == EIO) { /* The kernel we're running on doesn't support the GETREGS request. Reset `have_ptrace_getregs'. */ have_ptrace_getregs = 0; return; } perror_with_name (_("Couldn't get registers")); } supply_gregset (regcache, (const elf_gregset_t *) regs_p); } /* Store all valid general-purpose registers in GDB's register array into the process/thread specified by TID. */ static void store_regs (const struct regcache *regcache, int tid, int regno) { elf_gregset_t regs; if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) perror_with_name (_("Couldn't get registers")); fill_gregset (regcache, ®s, regno); if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) perror_with_name (_("Couldn't write registers")); } #else static void fetch_regs (struct regcache *regcache, int tid) {} static void store_regs (const struct regcache *regcache, int tid, int regno) {} #endif /* Transfering floating-point registers between GDB, inferiors and cores. */ /* Fill GDB's register array with the floating-point register values in *FPREGSETP. */ void supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp) { i387_supply_fsave (regcache, -1, fpregsetp); } /* Fill register REGNO (if it is a floating-point register) in *FPREGSETP with the value in GDB's register array. If REGNO is -1, do this for all registers. */ void fill_fpregset (const struct regcache *regcache, elf_fpregset_t *fpregsetp, int regno) { i387_collect_fsave (regcache, regno, fpregsetp); } #ifdef HAVE_PTRACE_GETREGS /* Fetch all floating-point registers from process/thread TID and store thier values in GDB's register array. */ static void fetch_fpregs (struct regcache *regcache, int tid) { elf_fpregset_t fpregs; if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) perror_with_name (_("Couldn't get floating point status")); supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs); } /* Store all valid floating-point registers in GDB's register array into the process/thread specified by TID. */ static void store_fpregs (const struct regcache *regcache, int tid, int regno) { elf_fpregset_t fpregs; if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) perror_with_name (_("Couldn't get floating point status")); fill_fpregset (regcache, &fpregs, regno); if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0) perror_with_name (_("Couldn't write floating point status")); } #else static void fetch_fpregs (struct regcache *regcache, int tid) {} static void store_fpregs (const struct regcache *regcache, int tid, int regno) {} #endif /* Transfering floating-point and SSE registers to and from GDB. */ /* Fetch all registers covered by the PTRACE_GETREGSET request from process/thread TID and store their values in GDB's register array. Return non-zero if successful, zero otherwise. */ static int fetch_xstateregs (struct regcache *regcache, int tid) { char xstateregs[I386_XSTATE_MAX_SIZE]; struct iovec iov; if (!have_ptrace_getregset) return 0; iov.iov_base = xstateregs; iov.iov_len = sizeof(xstateregs); if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE, &iov) < 0) perror_with_name (_("Couldn't read extended state status")); i387_supply_xsave (regcache, -1, xstateregs); return 1; } /* Store all valid registers in GDB's register array covered by the PTRACE_SETREGSET request into the process/thread specified by TID. Return non-zero if successful, zero otherwise. */ static int store_xstateregs (const struct regcache *regcache, int tid, int regno) { char xstateregs[I386_XSTATE_MAX_SIZE]; struct iovec iov; if (!have_ptrace_getregset) return 0; iov.iov_base = xstateregs; iov.iov_len = sizeof(xstateregs); if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE, &iov) < 0) perror_with_name (_("Couldn't read extended state status")); i387_collect_xsave (regcache, regno, xstateregs, 0); if (ptrace (PTRACE_SETREGSET, tid, (unsigned int) NT_X86_XSTATE, (int) &iov) < 0) perror_with_name (_("Couldn't write extended state status")); return 1; } #ifdef HAVE_PTRACE_GETFPXREGS /* Fetch all registers covered by the PTRACE_GETFPXREGS request from process/thread TID and store their values in GDB's register array. Return non-zero if successful, zero otherwise. */ static int fetch_fpxregs (struct regcache *regcache, int tid) { elf_fpxregset_t fpxregs; if (! have_ptrace_getfpxregs) return 0; if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) { if (errno == EIO) { have_ptrace_getfpxregs = 0; return 0; } perror_with_name (_("Couldn't read floating-point and SSE registers")); } i387_supply_fxsave (regcache, -1, (const elf_fpxregset_t *) &fpxregs); return 1; } /* Store all valid registers in GDB's register array covered by the PTRACE_SETFPXREGS request into the process/thread specified by TID. Return non-zero if successful, zero otherwise. */ static int store_fpxregs (const struct regcache *regcache, int tid, int regno) { elf_fpxregset_t fpxregs; if (! have_ptrace_getfpxregs) return 0; if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1) { if (errno == EIO) { have_ptrace_getfpxregs = 0; return 0; } perror_with_name (_("Couldn't read floating-point and SSE registers")); } i387_collect_fxsave (regcache, regno, &fpxregs); if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1) perror_with_name (_("Couldn't write floating-point and SSE registers")); return 1; } #else static int fetch_fpxregs (struct regcache *regcache, int tid) { return 0; } static int store_fpxregs (const struct regcache *regcache, int tid, int regno) { return 0; } #endif /* HAVE_PTRACE_GETFPXREGS */ /* Transferring arbitrary registers between GDB and inferior. */ /* Fetch register REGNO from the child process. If REGNO is -1, do this for all registers (including the floating point and SSE registers). */ static void i386_linux_fetch_inferior_registers (struct target_ops *ops, struct regcache *regcache, int regno) { int tid; /* Use the old method of peeking around in `struct user' if the GETREGS request isn't available. */ if (!have_ptrace_getregs) { int i; for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) if (regno == -1 || regno == i) fetch_register (regcache, i); return; } /* GNU/Linux LWP ID's are process ID's. */ tid = TIDGET (inferior_ptid); if (tid == 0) tid = PIDGET (inferior_ptid); /* Not a threaded program. */ /* Use the PTRACE_GETFPXREGS request whenever possible, since it transfers more registers in one system call, and we'll cache the results. But remember that fetch_fpxregs can fail, and return zero. */ if (regno == -1) { fetch_regs (regcache, tid); /* The call above might reset `have_ptrace_getregs'. */ if (!have_ptrace_getregs) { i386_linux_fetch_inferior_registers (ops, regcache, regno); return; } if (fetch_xstateregs (regcache, tid)) return; if (fetch_fpxregs (regcache, tid)) return; fetch_fpregs (regcache, tid); return; } if (GETREGS_SUPPLIES (regno)) { fetch_regs (regcache, tid); return; } if (GETXSTATEREGS_SUPPLIES (regno)) { if (fetch_xstateregs (regcache, tid)) return; } if (GETFPXREGS_SUPPLIES (regno)) { if (fetch_fpxregs (regcache, tid)) return; /* Either our processor or our kernel doesn't support the SSE registers, so read the FP registers in the traditional way, and fill the SSE registers with dummy values. It would be more graceful to handle differences in the register set using gdbarch. Until then, this will at least make things work plausibly. */ fetch_fpregs (regcache, tid); return; } internal_error (__FILE__, __LINE__, _("Got request for bad register number %d."), regno); } /* Store register REGNO back into the child process. If REGNO is -1, do this for all registers (including the floating point and SSE registers). */ static void i386_linux_store_inferior_registers (struct target_ops *ops, struct regcache *regcache, int regno) { int tid; /* Use the old method of poking around in `struct user' if the SETREGS request isn't available. */ if (!have_ptrace_getregs) { int i; for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) if (regno == -1 || regno == i) store_register (regcache, i); return; } /* GNU/Linux LWP ID's are process ID's. */ tid = TIDGET (inferior_ptid); if (tid == 0) tid = PIDGET (inferior_ptid); /* Not a threaded program. */ /* Use the PTRACE_SETFPXREGS requests whenever possible, since it transfers more registers in one system call. But remember that store_fpxregs can fail, and return zero. */ if (regno == -1) { store_regs (regcache, tid, regno); if (store_xstateregs (regcache, tid, regno)) return; if (store_fpxregs (regcache, tid, regno)) return; store_fpregs (regcache, tid, regno); return; } if (GETREGS_SUPPLIES (regno)) { store_regs (regcache, tid, regno); return; } if (GETXSTATEREGS_SUPPLIES (regno)) { if (store_xstateregs (regcache, tid, regno)) return; } if (GETFPXREGS_SUPPLIES (regno)) { if (store_fpxregs (regcache, tid, regno)) return; /* Either our processor or our kernel doesn't support the SSE registers, so just write the FP registers in the traditional way. */ store_fpregs (regcache, tid, regno); return; } internal_error (__FILE__, __LINE__, _("Got request to store bad register number %d."), regno); } /* Support for debug registers. */ static unsigned long i386_linux_dr[DR_CONTROL + 1]; /* Get debug register REGNUM value from only the one LWP of PTID. */ static unsigned long i386_linux_dr_get (ptid_t ptid, int regnum) { int tid; unsigned long value; tid = TIDGET (ptid); if (tid == 0) tid = PIDGET (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 vector. For now, just return zero if the ptrace call fails. */ errno = 0; value = ptrace (PTRACE_PEEKUSER, 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; } /* Set debug register REGNUM to VALUE in only the one LWP of PTID. */ static void i386_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) { int tid; tid = TIDGET (ptid); if (tid == 0) tid = PIDGET (ptid); errno = 0; ptrace (PTRACE_POKEUSER, tid, offsetof (struct user, u_debugreg[regnum]), value); if (errno != 0) perror_with_name (_("Couldn't write debug register")); } /* Set DR_CONTROL to ADDR in all LWPs of LWP_LIST. */ static void i386_linux_dr_set_control (unsigned long control) { struct lwp_info *lp; ptid_t ptid; i386_linux_dr[DR_CONTROL] = control; ALL_LWPS (lp, ptid) i386_linux_dr_set (ptid, DR_CONTROL, control); } /* Set address REGNUM (zero based) to ADDR in all LWPs of LWP_LIST. */ static void i386_linux_dr_set_addr (int regnum, CORE_ADDR addr) { struct lwp_info *lp; ptid_t ptid; gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); i386_linux_dr[DR_FIRSTADDR + regnum] = addr; ALL_LWPS (lp, ptid) i386_linux_dr_set (ptid, DR_FIRSTADDR + regnum, addr); } /* Set address REGNUM (zero based) to zero in all LWPs of LWP_LIST. */ static void i386_linux_dr_reset_addr (int regnum) { i386_linux_dr_set_addr (regnum, 0); } /* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */ static unsigned long i386_linux_dr_get_status (void) { return i386_linux_dr_get (inferior_ptid, DR_STATUS); } /* Unset MASK bits in DR_STATUS in all LWPs of LWP_LIST. */ static void i386_linux_dr_unset_status (unsigned long mask) { struct lwp_info *lp; ptid_t ptid; ALL_LWPS (lp, ptid) { unsigned long value; value = i386_linux_dr_get (ptid, DR_STATUS); value &= ~mask; i386_linux_dr_set (ptid, DR_STATUS, value); } } static void i386_linux_new_thread (ptid_t ptid) { int i; for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) i386_linux_dr_set (ptid, i, i386_linux_dr[i]); i386_linux_dr_set (ptid, DR_CONTROL, i386_linux_dr[DR_CONTROL]); } /* Called by libthread_db. Returns a pointer to the thread local storage (or its descriptor). */ ps_err_e ps_get_thread_area (const struct ps_prochandle *ph, lwpid_t lwpid, int idx, void **base) { /* NOTE: cagney/2003-08-26: The definition of this buffer is found in the kernel header <asm-i386/ldt.h>. It, after padding, is 4 x 4 byte integers in size: `entry_number', `base_addr', `limit', and a bunch of status bits. The values returned by this ptrace call should be part of the regcache buffer, and ps_get_thread_area should channel its request through the regcache. That way remote targets could provide the value using the remote protocol and not this direct call. Is this function needed? I'm guessing that the `base' is the address of a a descriptor that libthread_db uses to find the thread local address base that GDB needs. Perhaps that descriptor is defined by the ABI. Anyway, given that libthread_db calls this function without prompting (gdb requesting tls base) I guess it needs info in there anyway. */ unsigned int desc[4]; 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 *) idx, (unsigned long) &desc) < 0) return PS_ERR; *(int *)base = desc[1]; return PS_OK; } /* The instruction for a GNU/Linux system call is: int $0x80 or 0xcd 0x80. */ static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; #define LINUX_SYSCALL_LEN (sizeof linux_syscall) /* The system call number is stored in the %eax register. */ #define LINUX_SYSCALL_REGNUM I386_EAX_REGNUM /* We are specifically interested in the sigreturn and rt_sigreturn system calls. */ #ifndef SYS_sigreturn #define SYS_sigreturn 0x77 #endif #ifndef SYS_rt_sigreturn #define SYS_rt_sigreturn 0xad #endif /* Offset to saved processor flags, from <asm/sigcontext.h>. */ #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) /* Resume execution of the inferior process. If STEP is nonzero, single-step it. If SIGNAL is nonzero, give it that signal. */ static void i386_linux_resume (struct target_ops *ops, ptid_t ptid, int step, enum target_signal signal) { int pid = PIDGET (ptid); int request; if (catch_syscall_enabled () > 0) request = PTRACE_SYSCALL; else request = PTRACE_CONT; if (step) { struct regcache *regcache = get_thread_regcache (pid_to_ptid (pid)); struct gdbarch *gdbarch = get_regcache_arch (regcache); enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); ULONGEST pc; gdb_byte buf[LINUX_SYSCALL_LEN]; request = PTRACE_SINGLESTEP; regcache_cooked_read_unsigned (regcache, gdbarch_pc_regnum (gdbarch), &pc); /* Returning from a signal trampoline is done by calling a special system call (sigreturn or rt_sigreturn, see i386-linux-tdep.c for more information). This system call restores the registers that were saved when the signal was raised, including %eflags. That means that single-stepping won't work. Instead, we'll have to modify the signal context that's about to be restored, and set the trace flag there. */ /* First check if PC is at a system call. */ if (target_read_memory (pc, buf, LINUX_SYSCALL_LEN) == 0 && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) { ULONGEST syscall; regcache_cooked_read_unsigned (regcache, LINUX_SYSCALL_REGNUM, &syscall); /* Then check the system call number. */ if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) { ULONGEST sp, addr; unsigned long int eflags; regcache_cooked_read_unsigned (regcache, I386_ESP_REGNUM, &sp); if (syscall == SYS_rt_sigreturn) addr = read_memory_integer (sp + 8, 4, byte_order) + 20; else addr = sp; /* Set the trace flag in the context that's about to be restored. */ addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; read_memory (addr, (gdb_byte *) &eflags, 4); eflags |= 0x0100; write_memory (addr, (gdb_byte *) &eflags, 4); } } } if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1) perror_with_name (("ptrace")); } static void (*super_post_startup_inferior) (ptid_t ptid); static void i386_linux_child_post_startup_inferior (ptid_t ptid) { i386_cleanup_dregs (); super_post_startup_inferior (ptid); } /* Get Linux/x86 target description from running target. */ static const struct target_desc * i386_linux_read_description (struct target_ops *ops) { int tid; static uint64_t xcr0; /* GNU/Linux LWP ID's are process ID's. */ tid = TIDGET (inferior_ptid); if (tid == 0) tid = PIDGET (inferior_ptid); /* Not a threaded program. */ #ifdef HAVE_PTRACE_GETFPXREGS if (have_ptrace_getfpxregs == -1) { elf_fpxregset_t fpxregs; if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) { have_ptrace_getfpxregs = 0; have_ptrace_getregset = 0; return tdesc_i386_mmx_linux; } } #endif if (have_ptrace_getregset == -1) { uint64_t xstateregs[(I386_XSTATE_SSE_SIZE / sizeof (uint64_t))]; struct iovec iov; iov.iov_base = xstateregs; iov.iov_len = sizeof (xstateregs); /* Check if PTRACE_GETREGSET works. */ if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE, &iov) < 0) have_ptrace_getregset = 0; else { have_ptrace_getregset = 1; /* Get XCR0 from XSAVE extended state. */ xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET / sizeof (long long))]; } } /* Check the native XCR0 only if PTRACE_GETREGSET is available. */ if (have_ptrace_getregset && (xcr0 & I386_XSTATE_AVX_MASK) == I386_XSTATE_AVX_MASK) return tdesc_i386_avx_linux; else return tdesc_i386_linux; } void _initialize_i386_linux_nat (void) { struct target_ops *t; /* Fill in the generic GNU/Linux methods. */ t = linux_target (); i386_use_watchpoints (t); i386_dr_low.set_control = i386_linux_dr_set_control; i386_dr_low.set_addr = i386_linux_dr_set_addr; i386_dr_low.reset_addr = i386_linux_dr_reset_addr; i386_dr_low.get_status = i386_linux_dr_get_status; i386_dr_low.unset_status = i386_linux_dr_unset_status; i386_set_debug_register_length (4); /* Override the default ptrace resume method. */ t->to_resume = i386_linux_resume; /* Override the GNU/Linux inferior startup hook. */ super_post_startup_inferior = t->to_post_startup_inferior; t->to_post_startup_inferior = i386_linux_child_post_startup_inferior; /* Add our register access methods. */ t->to_fetch_registers = i386_linux_fetch_inferior_registers; t->to_store_registers = i386_linux_store_inferior_registers; t->to_read_description = i386_linux_read_description; /* Register the target. */ linux_nat_add_target (t); linux_nat_set_new_thread (t, i386_linux_new_thread); }
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