diff options
Diffstat (limited to 'contrib/gdb/gdb/i386bsd-nat.c')
| -rw-r--r-- | contrib/gdb/gdb/i386bsd-nat.c | 400 |
1 files changed, 400 insertions, 0 deletions
diff --git a/contrib/gdb/gdb/i386bsd-nat.c b/contrib/gdb/gdb/i386bsd-nat.c new file mode 100644 index 0000000..5d35830 --- /dev/null +++ b/contrib/gdb/gdb/i386bsd-nat.c @@ -0,0 +1,400 @@ +/* Native-dependent code for modern i386 BSD's. + Copyright 2000, 2001, 2002 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 + (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, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include "defs.h" +#include "inferior.h" +#include "regcache.h" + +#include "gdb_assert.h" +#include <signal.h> +#include <stddef.h> +#include <sys/types.h> +#include <sys/ptrace.h> +#include <machine/reg.h> +#include <machine/frame.h> + +#ifdef HAVE_SYS_PROCFS_H +#include <sys/procfs.h> +#endif + +#ifndef HAVE_GREGSET_T +typedef struct reg gregset_t; +#endif + +#ifndef HAVE_FPREGSET_T +typedef struct fpreg fpregset_t; +#endif + +#include "gregset.h" + + +/* In older BSD versions we cannot get at some of the segment + registers. FreeBSD for example didn't support the %fs and %gs + registers until the 3.0 release. We have autoconf checks for their + presence, and deal gracefully with their absence. */ + +/* Registers we shouldn't try to fetch. */ +#if !defined (CANNOT_FETCH_REGISTER) +#define CANNOT_FETCH_REGISTER(regno) cannot_fetch_register (regno) +#endif + +/* Registers we shouldn't try to store. */ +#if !defined (CANNOT_STORE_REGISTER) +#define CANNOT_STORE_REGISTER(regno) cannot_fetch_register (regno) +#endif + +/* Offset to the gregset_t location where REG is stored. */ +#define REG_OFFSET(reg) offsetof (gregset_t, reg) + +/* At reg_offset[REGNO] you'll find the offset to the gregset_t + location where the GDB register REGNO is stored. Unsupported + registers are marked with `-1'. */ +static int reg_offset[] = +{ + REG_OFFSET (r_eax), + REG_OFFSET (r_ecx), + REG_OFFSET (r_edx), + REG_OFFSET (r_ebx), + REG_OFFSET (r_esp), + REG_OFFSET (r_ebp), + REG_OFFSET (r_esi), + REG_OFFSET (r_edi), + REG_OFFSET (r_eip), + REG_OFFSET (r_eflags), + REG_OFFSET (r_cs), + REG_OFFSET (r_ss), + REG_OFFSET (r_ds), + REG_OFFSET (r_es), +#ifdef HAVE_STRUCT_REG_R_FS + REG_OFFSET (r_fs), +#else + -1, +#endif +#ifdef HAVE_STRUCT_REG_R_GS + REG_OFFSET (r_gs) +#else + -1 +#endif +}; + +#define REG_ADDR(regset, regno) ((char *) (regset) + reg_offset[regno]) + +/* Macro to determine if a register is fetched with PT_GETREGS. */ +#define GETREGS_SUPPLIES(regno) \ + ((0 <= (regno) && (regno) <= 15)) + +#ifdef HAVE_PT_GETXMMREGS +/* Set to 1 if the kernel supports PT_GETXMMREGS. Initialized to -1 + so that we try PT_GETXMMREGS the first time around. */ +static int have_ptrace_xmmregs = -1; +#endif + +/* Return nonzero if we shouldn't try to fetch register REGNO. */ + +static int +cannot_fetch_register (int regno) +{ + return (reg_offset[regno] == -1); +} + + +/* Transfering the registers between GDB, inferiors and core files. */ + +/* Fill GDB's register array with the general-purpose register values + in *GREGSETP. */ + +void +supply_gregset (gregset_t *gregsetp) +{ + int i; + + for (i = 0; i < NUM_GREGS; i++) + { + if (CANNOT_FETCH_REGISTER (i)) + supply_register (i, NULL); + else + supply_register (i, REG_ADDR (gregsetp, i)); + } +} + +/* 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 (gregset_t *gregsetp, int regno) +{ + int i; + + for (i = 0; i < NUM_GREGS; i++) + if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i)) + regcache_collect (i, REG_ADDR (gregsetp, i)); +} + +#include "i387-nat.h" + +/* Fill GDB's register array with the floating-point register values + in *FPREGSETP. */ + +void +supply_fpregset (fpregset_t *fpregsetp) +{ + i387_supply_fsave ((char *) 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 (fpregset_t *fpregsetp, int regno) +{ + i387_fill_fsave ((char *) fpregsetp, regno); +} + +/* Fetch register REGNO from the inferior. If REGNO is -1, do this + for all registers (including the floating point registers). */ + +void +fetch_inferior_registers (int regno) +{ + + if (regno == -1 || GETREGS_SUPPLIES (regno)) + { + gregset_t gregs; + + if (ptrace (PT_GETREGS, PIDGET (inferior_ptid), + (PTRACE_ARG3_TYPE) &gregs, 0) == -1) + perror_with_name ("Couldn't get registers"); + + supply_gregset (&gregs); + if (regno != -1) + return; + } + + if (regno == -1 || regno >= FP0_REGNUM) + { + fpregset_t fpregs; +#ifdef HAVE_PT_GETXMMREGS + char xmmregs[512]; + + if (have_ptrace_xmmregs != 0 && + ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid), + (PTRACE_ARG3_TYPE) xmmregs, 0) == 0) + { + have_ptrace_xmmregs = 1; + i387_supply_fxsave (xmmregs); + } + else + { + if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), + (PTRACE_ARG3_TYPE) &fpregs, 0) == -1) + perror_with_name ("Couldn't get floating point status"); + + supply_fpregset (&fpregs); + } +#else + if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), + (PTRACE_ARG3_TYPE) &fpregs, 0) == -1) + perror_with_name ("Couldn't get floating point status"); + + supply_fpregset (&fpregs); +#endif + } +} + +/* Store register REGNO back into the inferior. If REGNO is -1, do + this for all registers (including the floating point registers). */ + +void +store_inferior_registers (int regno) +{ + + if (regno == -1 || GETREGS_SUPPLIES (regno)) + { + gregset_t gregs; + + if (ptrace (PT_GETREGS, PIDGET (inferior_ptid), + (PTRACE_ARG3_TYPE) &gregs, 0) == -1) + perror_with_name ("Couldn't get registers"); + + fill_gregset (&gregs, regno); + + if (ptrace (PT_SETREGS, PIDGET (inferior_ptid), + (PTRACE_ARG3_TYPE) &gregs, 0) == -1) + perror_with_name ("Couldn't write registers"); + + if (regno != -1) + return; + } + + if (regno == -1 || regno >= FP0_REGNUM) + { + fpregset_t fpregs; +#ifdef HAVE_PT_GETXMMREGS + char xmmregs[512]; + + if (have_ptrace_xmmregs != 0 && + ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid), + (PTRACE_ARG3_TYPE) xmmregs, 0) == 0) + { + have_ptrace_xmmregs = 1; + + i387_fill_fxsave (xmmregs, regno); + + if (ptrace (PT_SETXMMREGS, PIDGET (inferior_ptid), + (PTRACE_ARG3_TYPE) xmmregs, 0) == -1) + perror_with_name ("Couldn't write XMM registers"); + } + else + { + have_ptrace_xmmregs = 0; +#endif + if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), + (PTRACE_ARG3_TYPE) &fpregs, 0) == -1) + perror_with_name ("Couldn't get floating point status"); + + fill_fpregset (&fpregs, regno); + + if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid), + (PTRACE_ARG3_TYPE) &fpregs, 0) == -1) + perror_with_name ("Couldn't write floating point status"); +#ifdef HAVE_PT_GETXMMREGS + } +#endif + } +} + + +/* Support for debug registers. */ + +#ifdef HAVE_PT_GETDBREGS + +/* Not all versions of FreeBSD/i386 that support the debug registers + have this macro. */ +#ifndef DBREG_DRX +#define DBREG_DRX(d, x) ((&d->dr0)[x]) +#endif + +static void +i386bsd_dr_set (int regnum, unsigned int value) +{ + struct dbreg dbregs; + + if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid), + (PTRACE_ARG3_TYPE) &dbregs, 0) == -1) + perror_with_name ("Couldn't get debug registers"); + + /* For some mysterious reason, some of the reserved bits in the + debug control register get set. Mask these off, otherwise the + ptrace call below will fail. */ + dbregs.dr7 &= ~(0x0000fc00); + + DBREG_DRX ((&dbregs), regnum) = value; + + if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid), + (PTRACE_ARG3_TYPE) &dbregs, 0) == -1) + perror_with_name ("Couldn't write debug registers"); +} + +void +i386bsd_dr_set_control (unsigned long control) +{ + i386bsd_dr_set (7, control); +} + +void +i386bsd_dr_set_addr (int regnum, CORE_ADDR addr) +{ + gdb_assert (regnum >= 0 && regnum <= 4); + + i386bsd_dr_set (regnum, addr); +} + +void +i386bsd_dr_reset_addr (int regnum) +{ + gdb_assert (regnum >= 0 && regnum <= 4); + + i386bsd_dr_set (regnum, 0); +} + +unsigned long +i386bsd_dr_get_status (void) +{ + struct dbreg dbregs; + + /* FIXME: kettenis/2001-03-31: 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. */ + if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid), + (PTRACE_ARG3_TYPE) & dbregs, 0) == -1) +#if 0 + perror_with_name ("Couldn't read debug registers"); +#else + return 0; +#endif + + return dbregs.dr6; +} + +#endif /* PT_GETDBREGS */ + + +/* Support for the user struct. */ + +/* Return the address register REGNO. BLOCKEND is the value of + u.u_ar0, which should point to the registers. */ + +CORE_ADDR +register_u_addr (CORE_ADDR blockend, int regno) +{ + return (CORE_ADDR) REG_ADDR (blockend, regno); +} + +#include <sys/param.h> +#include <sys/user.h> + +/* Return the size of the user struct. */ + +int +kernel_u_size (void) +{ + return (sizeof (struct user)); +} + +/* See i386bsd-tdep.c. */ +extern int i386bsd_sigcontext_pc_offset; + +void +_initialize_i386bsd_nat (void) +{ + /* To support the recognition of signal handlers, i386bsd-tdep.c + hardcodes some constants. Inclusion of this file means that we + are compiling a native debugger, which means that we can use the + system header files and sysctl(3) to get at the relevant + information. */ + + /* Override the default value for the offset of the program counter + in the sigcontext structure. */ + i386bsd_sigcontext_pc_offset = offsetof (struct sigcontext, sc_pc); +} |
