X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fi386bsd-nat.c;h=7bc906f70e94632d8d557b72724c8603b980038e;hb=6532ff3697890085456f353dd49068edfd4ed422;hp=c4def7e568f6d2a624eba4e4bf37b29cf7acabb9;hpb=e6031aeb52be6c31dc1c7cbd7c74de76a114ad02;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/i386bsd-nat.c b/gdb/i386bsd-nat.c index c4def7e568..7bc906f70e 100644 --- a/gdb/i386bsd-nat.c +++ b/gdb/i386bsd-nat.c @@ -1,11 +1,12 @@ /* Native-dependent code for modern i386 BSD's. - Copyright (C) 2000 Free Software Foundation, Inc. + + Copyright (C) 2000-2005, 2007-2012 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 + 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, @@ -14,57 +15,43 @@ 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 "regcache.h" +#include "gdb_assert.h" +#include +#include #include #include #include #include -#ifdef HAVE_SYS_PROCFS_H -#include -#endif - -#ifndef HAVE_GREGSET_T -typedef struct reg gregset_t; -#endif - -#ifndef HAVE_FPREGSET_T -typedef struct fpreg fpregset_t; -#endif +#include "i386-tdep.h" +#include "i387-tdep.h" +#include "i386bsd-nat.h" +#include "inf-ptrace.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) +/* Offset in `struct reg' where MEMBER is stored. */ +#define REG_OFFSET(member) offsetof (struct reg, member) -/* At reg_offset[REGNO] you'll find the offset to the gregset_t - location where the GDB register REGNO is stored. Unsupported +/* At i386bsd_reg_offset[REGNUM] you'll find the offset in `struct + reg' where the GDB register REGNUM is stored. Unsupported registers are marked with `-1'. */ -static int reg_offset[] = +static int i386bsd_r_reg_offset[] = { REG_OFFSET (r_eax), REG_OFFSET (r_ecx), REG_OFFSET (r_edx), - REG_OFFSET (r_edx), + REG_OFFSET (r_ebx), REG_OFFSET (r_esp), REG_OFFSET (r_ebp), REG_OFFSET (r_esi), @@ -75,164 +62,350 @@ static int reg_offset[] = REG_OFFSET (r_ss), REG_OFFSET (r_ds), REG_OFFSET (r_es), -#ifdef HAVE_R_FS +#ifdef HAVE_STRUCT_REG_R_FS REG_OFFSET (r_fs), #else -1, #endif -#ifdef HAVE_R_GS +#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(regnum) \ + ((0 <= (regnum) && (regnum) <= 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. */ +/* Supply the general-purpose registers in GREGS, to REGCACHE. */ -static int -cannot_fetch_register (int regno) +static void +i386bsd_supply_gregset (struct regcache *regcache, const void *gregs) { - return (reg_offset[regno] == -1); -} - + const char *regs = gregs; + int regnum; -/* Transfering the registers between GDB, inferiors and core files. */ + for (regnum = 0; regnum < ARRAY_SIZE (i386bsd_r_reg_offset); regnum++) + { + int offset = i386bsd_r_reg_offset[regnum]; -/* Fill GDB's register array with the genereal-purpose register values - in *GREGSETP. */ + if (offset != -1) + regcache_raw_supply (regcache, regnum, regs + offset); + } +} -void -supply_gregset (gregset_t *gregsetp) +/* Collect register REGNUM from REGCACHE and store its contents in + GREGS. If REGNUM is -1, collect and store all appropriate + registers. */ + +static void +i386bsd_collect_gregset (const struct regcache *regcache, + void *gregs, int regnum) { - char buf[MAX_REGISTER_RAW_SIZE]; + char *regs = gregs; int i; - for (i = 0; i < NUM_GREGS; i++) + for (i = 0; i < ARRAY_SIZE (i386bsd_r_reg_offset); i++) + { + if (regnum == -1 || regnum == i) + { + int offset = i386bsd_r_reg_offset[i]; + + if (offset != -1) + regcache_raw_collect (regcache, i, regs + offset); + } + } +} + +/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this + for all registers (including the floating point registers). */ + +static void +i386bsd_fetch_inferior_registers (struct target_ops *ops, + struct regcache *regcache, int regnum) +{ + if (regnum == -1 || GETREGS_SUPPLIES (regnum)) + { + struct reg regs; + + if (ptrace (PT_GETREGS, PIDGET (inferior_ptid), + (PTRACE_TYPE_ARG3) ®s, 0) == -1) + perror_with_name (_("Couldn't get registers")); + + i386bsd_supply_gregset (regcache, ®s); + if (regnum != -1) + return; + } + + if (regnum == -1 || regnum >= I386_ST0_REGNUM) { - if (CANNOT_FETCH_REGISTER (i)) + struct fpreg fpregs; +#ifdef HAVE_PT_GETXMMREGS + char xmmregs[512]; + + if (have_ptrace_xmmregs != 0 + && ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid), + (PTRACE_TYPE_ARG3) xmmregs, 0) == 0) { - memset (buf, 0, REGISTER_RAW_SIZE (i)); - supply_register (i, buf); + have_ptrace_xmmregs = 1; + i387_supply_fxsave (regcache, -1, xmmregs); } else - supply_register (i, REG_ADDR (gregsetp, i)); + { + if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), + (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) + perror_with_name (_("Couldn't get floating point status")); + + i387_supply_fsave (regcache, -1, &fpregs); + } +#else + if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), + (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) + perror_with_name (_("Couldn't get floating point status")); + + i387_supply_fsave (regcache, -1, &fpregs); +#endif } } -/* 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. */ +/* Store register REGNUM back into the inferior. If REGNUM is -1, do + this for all registers (including the floating point registers). */ -void -fill_gregset (gregset_t *gregsetp, int regno) +static void +i386bsd_store_inferior_registers (struct target_ops *ops, + struct regcache *regcache, int regnum) { - int i; + if (regnum == -1 || GETREGS_SUPPLIES (regnum)) + { + struct reg regs; + + if (ptrace (PT_GETREGS, PIDGET (inferior_ptid), + (PTRACE_TYPE_ARG3) ®s, 0) == -1) + perror_with_name (_("Couldn't get registers")); - for (i = 0; i < NUM_GREGS; i++) - if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i)) - memcpy (REG_ADDR (gregsetp, i), ®isters[REGISTER_BYTE (regno)], - REGISTER_RAW_SIZE (i)); + i386bsd_collect_gregset (regcache, ®s, regnum); + + if (ptrace (PT_SETREGS, PIDGET (inferior_ptid), + (PTRACE_TYPE_ARG3) ®s, 0) == -1) + perror_with_name (_("Couldn't write registers")); + + if (regnum != -1) + return; + } + + if (regnum == -1 || regnum >= I386_ST0_REGNUM) + { + struct fpreg fpregs; +#ifdef HAVE_PT_GETXMMREGS + char xmmregs[512]; + + if (have_ptrace_xmmregs != 0 + && ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid), + (PTRACE_TYPE_ARG3) xmmregs, 0) == 0) + { + have_ptrace_xmmregs = 1; + + i387_collect_fxsave (regcache, regnum, xmmregs); + + if (ptrace (PT_SETXMMREGS, PIDGET (inferior_ptid), + (PTRACE_TYPE_ARG3) 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_TYPE_ARG3) &fpregs, 0) == -1) + perror_with_name (_("Couldn't get floating point status")); + + i387_collect_fsave (regcache, regnum, &fpregs); + + if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid), + (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) + perror_with_name (_("Couldn't write floating point status")); +#ifdef HAVE_PT_GETXMMREGS + } +#endif + } } -#include "i387-nat.h" +/* Create a prototype *BSD/i386 target. The client can override it + with local methods. */ -/* Fill GDB's register array with the floating-point register values - in *FPREGSETP. */ +struct target_ops * +i386bsd_target (void) +{ + struct target_ops *t; -void -supply_fpregset (fpregset_t *fpregsetp) + t = inf_ptrace_target (); + t->to_fetch_registers = i386bsd_fetch_inferior_registers; + t->to_store_registers = i386bsd_store_inferior_registers; + return t; +} + + +/* 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 unsigned long +i386bsd_dr_get (ptid_t ptid, int regnum) { - i387_supply_fsave ((char *) fpregsetp); + struct dbreg dbregs; + + if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid), + (PTRACE_TYPE_ARG3) &dbregs, 0) == -1) + perror_with_name (_("Couldn't read debug registers")); + + return DBREG_DRX ((&dbregs), regnum); } -/* 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. */ +static void +i386bsd_dr_set (int regnum, unsigned int value) +{ + struct dbreg dbregs; + + if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid), + (PTRACE_TYPE_ARG3) &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. */ + DBREG_DRX ((&dbregs), 7) &= ~(0x0000fc00); + + DBREG_DRX ((&dbregs), regnum) = value; + + if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid), + (PTRACE_TYPE_ARG3) &dbregs, 0) == -1) + perror_with_name (_("Couldn't write debug registers")); +} void -fill_fpregset (fpregset_t *fpregsetp, int regno) +i386bsd_dr_set_control (unsigned long control) { - i387_fill_fsave ((char *) fpregsetp, regno); + i386bsd_dr_set (7, control); } -/* 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) +i386bsd_dr_set_addr (int regnum, CORE_ADDR addr) { - gregset_t gregs; + gdb_assert (regnum >= 0 && regnum <= 4); - if (ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1) - perror_with_name ("Couldn't get registers"); + i386bsd_dr_set (regnum, addr); +} - supply_gregset (&gregs); +CORE_ADDR +i386bsd_dr_get_addr (int regnum) +{ + return i386bsd_dr_get (inferior_ptid, regnum); +} - if (regno == -1 || regno >= FP0_REGNUM) - { - fpregset_t fpregs; +unsigned long +i386bsd_dr_get_status (void) +{ + return i386bsd_dr_get (inferior_ptid, 6); +} - if (ptrace (PT_GETFPREGS, inferior_pid, - (PTRACE_ARG3_TYPE) &fpregs, 0) == -1) - perror_with_name ("Couldn't get floating point status"); +unsigned long +i386bsd_dr_get_control (void) +{ + return i386bsd_dr_get (inferior_ptid, 7); +} - supply_fpregset (&fpregs); - } -} +#endif /* PT_GETDBREGS */ + -/* Store register REGNO back into the inferior. If REGNO is -1, do - this for all registers (including the floating point registers). */ +/* Provide a prototype to silence -Wmissing-prototypes. */ +void _initialize_i386bsd_nat (void); void -store_inferior_registers (int regno) +_initialize_i386bsd_nat (void) { - gregset_t gregs; + int offset; + + /* 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. */ + +#if defined (__FreeBSD_version) && __FreeBSD_version >= 400011 +#define SC_REG_OFFSET i386fbsd4_sc_reg_offset +#elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005 +#define SC_REG_OFFSET i386fbsd_sc_reg_offset +#elif defined (NetBSD) || defined (__NetBSD_Version__) +#define SC_REG_OFFSET i386nbsd_sc_reg_offset +#elif defined (OpenBSD) +#define SC_REG_OFFSET i386obsd_sc_reg_offset +#endif - if (ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1) - perror_with_name ("Couldn't get registers"); +#ifdef SC_REG_OFFSET - fill_gregset (&gregs, regno); + /* We only check the program counter, stack pointer and frame + pointer since these members of `struct sigcontext' are essential + for providing backtraces. More checks could be added, but would + involve adding configure checks for the appropriate structure + members, since older BSD's don't provide all of them. */ - if (ptrace (PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1) - perror_with_name ("Couldn't write registers"); +#define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM] +#define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM] +#define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM] - if (regno == -1 || regno >= FP0_REGNUM) + /* Override the default value for the offset of the program counter + in the sigcontext structure. */ + offset = offsetof (struct sigcontext, sc_pc); + + if (SC_PC_OFFSET != offset) { - fpregset_t fpregs; + warning (_("\ +offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\ +Please report this to ."), + offset, SC_PC_OFFSET); + } - if (ptrace (PT_GETFPREGS, inferior_pid, - (PTRACE_ARG3_TYPE) &fpregs, 0) == -1) - perror_with_name ("Couldn't get floating point status"); + SC_PC_OFFSET = offset; - fill_fpregset (&fpregs, regno); - - if (ptrace (PT_SETFPREGS, inferior_pid, - (PTRACE_ARG3_TYPE) &fpregs, 0) == -1) - perror_with_name ("Couldn't write floating point status"); + /* Likewise for the stack pointer. */ + offset = offsetof (struct sigcontext, sc_sp); + + if (SC_SP_OFFSET != offset) + { + warning (_("\ +offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\ +Please report this to ."), + offset, SC_SP_OFFSET); } -} - -/* Support for the user struct. */ + SC_SP_OFFSET = offset; -/* Return the address register REGNO. BLOCKEND is the value of - u.u_ar0, which should point to the registers. */ + /* And the frame pointer. */ + offset = offsetof (struct sigcontext, sc_fp); -CORE_ADDR -register_u_addr (CORE_ADDR blockend, int regno) -{ - return (CORE_ADDR) REG_ADDR (blockend, regno); -} - -#include -#include + if (SC_FP_OFFSET != offset) + { + warning (_("\ +offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\ +Please report this to ."), + offset, SC_FP_OFFSET); + } -/* Return the size of the user struct. */ + SC_FP_OFFSET = offset; -int -kernel_u_size (void) -{ - return (sizeof (struct user)); +#endif /* SC_REG_OFFSET */ }