X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fm68klinux-nat.c;h=3be7c14b1f885b624e680660847ca9611317db77;hb=940c3c0683afd9d13629a9104695a24ed0fa82a3;hp=111f2a91a2fd52642d8d10142243c9f58c82065c;hpb=d0352a18a504a4e7b761f6b3264cf11347d8d056;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/m68klinux-nat.c b/gdb/m68klinux-nat.c index 111f2a91a2..3be7c14b1f 100644 --- a/gdb/m68klinux-nat.c +++ b/gdb/m68klinux-nat.c @@ -1,11 +1,12 @@ -/* Motorola m68k native support for Linux - Copyright (C) 1996,1998 Free Software Foundation, Inc. +/* Motorola m68k native support for GNU/Linux. + + Copyright (C) 1996, 1998, 2000-2012 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, @@ -14,37 +15,51 @@ 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 "frame.h" #include "inferior.h" #include "language.h" #include "gdbcore.h" +#include "gdb_string.h" +#include "regcache.h" +#include "target.h" +#include "linux-nat.h" -#ifdef USG -#include -#endif +#include "m68k-tdep.h" #include #include #include +#include #include #include #include #include +#ifdef HAVE_SYS_REG_H +#include +#endif + #include #include "gdb_stat.h" #include "floatformat.h" #include "target.h" - -/* This table must line up with REGISTER_NAMES in tm-m68k.h */ +/* Prototypes for supply_gregset etc. */ +#include "gregset.h" + +/* Defines ps_err_e, struct ps_prochandle. */ +#include "gdb_proc_service.h" + +#ifndef PTRACE_GET_THREAD_AREA +#define PTRACE_GET_THREAD_AREA 25 +#endif + +/* This table must line up with gdbarch_register_name in "m68k-tdep.c". */ static const int regmap[] = { PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7, @@ -56,104 +71,546 @@ static const int regmap[] = 45, 46, 47 }; -/* BLOCKEND is the value of u.u_ar0, and points to the place where GS - is stored. */ +/* Which ptrace request retrieves which registers? + These apply to the corresponding SET requests as well. */ +#define NUM_GREGS (18) +#define MAX_NUM_REGS (NUM_GREGS + 11) -int -m68k_linux_register_u_addr (blockend, regnum) - int blockend; - int regnum; +static int +getregs_supplies (int regno) { - return (blockend + 4 * regmap[regnum]); + return 0 <= regno && regno < NUM_GREGS; } -/* Given a pointer to a general register set in /proc format (gregset_t *), - unpack the register contents and supply them as gdb's idea of the current - register values. */ +static int +getfpregs_supplies (int regno) +{ + return M68K_FP0_REGNUM <= regno && regno <= M68K_FPI_REGNUM; +} +/* Does the current host support the GETREGS request? */ +static int have_ptrace_getregs = +#ifdef HAVE_PTRACE_GETREGS + 1 +#else + 0 +#endif +; -/* Note both m68k-tdep.c and m68klinux-nat.c contain definitions - for supply_gregset and supply_fpregset. The definitions - in m68k-tdep.c are valid if USE_PROC_FS is defined. Otherwise, - the definitions in m68klinux-nat.c will be used. This is a - bit of a hack. The supply_* routines do not belong in - *_tdep.c files. But, there are several lynx ports that currently - depend on these definitions. */ + -#ifndef USE_PROC_FS +/* Fetching registers directly from the U area, one at a time. */ -/* Prototypes for supply_gregset etc. */ -#include "gregset.h" +/* Fetch one register. */ + +static void +fetch_register (struct regcache *regcache, int regno) +{ + struct gdbarch *gdbarch = get_regcache_arch (regcache); + long regaddr, val; + int i; + char buf[MAX_REGISTER_SIZE]; + int tid; + + /* Overload thread id onto process id. */ + tid = TIDGET (inferior_ptid); + if (tid == 0) + tid = PIDGET (inferior_ptid); /* no thread id, just use + process id. */ + + regaddr = 4 * regmap[regno]; + for (i = 0; i < register_size (gdbarch, regno); i += sizeof (long)) + { + errno = 0; + val = ptrace (PTRACE_PEEKUSER, tid, regaddr, 0); + memcpy (&buf[i], &val, sizeof (long)); + regaddr += sizeof (long); + if (errno != 0) + error (_("Couldn't read register %s (#%d): %s."), + gdbarch_register_name (gdbarch, regno), + regno, safe_strerror (errno)); + } + regcache_raw_supply (regcache, regno, buf); +} + +/* Fetch register values from the inferior. + If REGNO is negative, do this for all registers. + Otherwise, REGNO specifies which register (so we can save time). */ + +static void +old_fetch_inferior_registers (struct regcache *regcache, int regno) +{ + if (regno >= 0) + { + fetch_register (regcache, regno); + } + else + { + for (regno = 0; + regno < gdbarch_num_regs (get_regcache_arch (regcache)); + regno++) + { + fetch_register (regcache, regno); + } + } +} + +/* Store one register. */ + +static void +store_register (const struct regcache *regcache, int regno) +{ + struct gdbarch *gdbarch = get_regcache_arch (regcache); + long regaddr, val; + int i; + int tid; + char buf[MAX_REGISTER_SIZE]; + + /* Overload thread id onto process id. */ + tid = TIDGET (inferior_ptid); + if (tid == 0) + tid = PIDGET (inferior_ptid); /* no thread id, just use + process id. */ + + regaddr = 4 * regmap[regno]; + + /* Put the contents of regno into a local buffer. */ + regcache_raw_collect (regcache, regno, buf); + + /* Store the local buffer into the inferior a chunk at the time. */ + for (i = 0; i < register_size (gdbarch, regno); i += sizeof (long)) + { + errno = 0; + memcpy (&val, &buf[i], sizeof (long)); + ptrace (PTRACE_POKEUSER, tid, regaddr, val); + regaddr += sizeof (long); + if (errno != 0) + error (_("Couldn't write register %s (#%d): %s."), + gdbarch_register_name (gdbarch, regno), + regno, safe_strerror (errno)); + } +} + +/* Store our register values back into the inferior. + If REGNO is negative, do this for all registers. + Otherwise, REGNO specifies which register (so we can save time). */ + +static void +old_store_inferior_registers (const struct regcache *regcache, int regno) +{ + if (regno >= 0) + { + store_register (regcache, regno); + } + else + { + for (regno = 0; + regno < gdbarch_num_regs (get_regcache_arch (regcache)); + regno++) + { + store_register (regcache, regno); + } + } +} + +/* Given a pointer to a general register set in /proc format + (elf_gregset_t *), unpack the register contents and supply + them as gdb's idea of the current register values. */ void -supply_gregset (gregsetp) - gregset_t *gregsetp; +supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp) { + struct gdbarch *gdbarch = get_regcache_arch (regcache); + const elf_greg_t *regp = (const elf_greg_t *) gregsetp; int regi; - for (regi = D0_REGNUM; regi <= SP_REGNUM; regi++) - supply_register (regi, (char *) (*gregsetp + regmap[regi])); - supply_register (PS_REGNUM, (char *) (*gregsetp + PT_SR)); - supply_register (PC_REGNUM, (char *) (*gregsetp + PT_PC)); + for (regi = M68K_D0_REGNUM; + regi <= gdbarch_sp_regnum (gdbarch); + regi++) + regcache_raw_supply (regcache, regi, ®p[regmap[regi]]); + regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch), + ®p[PT_SR]); + regcache_raw_supply (regcache, + gdbarch_pc_regnum (gdbarch), ®p[PT_PC]); +} + +/* 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) +{ + elf_greg_t *regp = (elf_greg_t *) gregsetp; + int i; + + for (i = 0; i < NUM_GREGS; i++) + if (regno == -1 || regno == i) + regcache_raw_collect (regcache, i, regp + regmap[i]); } -/* Given a pointer to a floating point register set in /proc format - (fpregset_t *), unpack the register contents and supply them as gdb's - idea of the current floating point register values. */ +#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; + + 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 *) ®s); +} + +/* 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. */ + +/* What is the address of fpN within the floating-point register set F? */ +#define FPREG_ADDR(f, n) (&(f)->fpregs[(n) * 3]) + +/* Fill GDB's register array with the floating-point register values in + *FPREGSETP. */ void -supply_fpregset (fpregsetp) - fpregset_t *fpregsetp; +supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp) { + struct gdbarch *gdbarch = get_regcache_arch (regcache); int regi; - for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++) - supply_register (regi, (char *) &fpregsetp->fpregs[(regi - FP0_REGNUM) * 3]); - supply_register (FPC_REGNUM, (char *) &fpregsetp->fpcntl[0]); - supply_register (FPS_REGNUM, (char *) &fpregsetp->fpcntl[1]); - supply_register (FPI_REGNUM, (char *) &fpregsetp->fpcntl[2]); + for (regi = gdbarch_fp0_regnum (gdbarch); + regi < gdbarch_fp0_regnum (gdbarch) + 8; regi++) + regcache_raw_supply (regcache, regi, + FPREG_ADDR (fpregsetp, + regi - gdbarch_fp0_regnum (gdbarch))); + regcache_raw_supply (regcache, M68K_FPC_REGNUM, &fpregsetp->fpcntl[0]); + regcache_raw_supply (regcache, M68K_FPS_REGNUM, &fpregsetp->fpcntl[1]); + regcache_raw_supply (regcache, M68K_FPI_REGNUM, &fpregsetp->fpcntl[2]); +} + +/* 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) +{ + struct gdbarch *gdbarch = get_regcache_arch (regcache); + int i; + + /* Fill in the floating-point registers. */ + for (i = gdbarch_fp0_regnum (gdbarch); + i < gdbarch_fp0_regnum (gdbarch) + 8; i++) + if (regno == -1 || regno == i) + regcache_raw_collect (regcache, i, + FPREG_ADDR (fpregsetp, + i - gdbarch_fp0_regnum (gdbarch))); + + /* Fill in the floating-point control registers. */ + for (i = M68K_FPC_REGNUM; i <= M68K_FPI_REGNUM; i++) + if (regno == -1 || regno == i) + regcache_raw_collect (regcache, i, + &fpregsetp->fpcntl[i - M68K_FPC_REGNUM]); +} + +#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 +/* Transferring arbitrary registers between GDB and inferior. */ -int -kernel_u_size () +/* 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 +m68k_linux_fetch_inferior_registers (struct target_ops *ops, + struct regcache *regcache, int regno) { - return (sizeof (struct user)); + int tid; + + /* Use the old method of peeking around in `struct user' if the + GETREGS request isn't available. */ + if (! have_ptrace_getregs) + { + old_fetch_inferior_registers (regcache, regno); + 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) + { + old_fetch_inferior_registers (regcache, -1); + return; + } + + fetch_fpregs (regcache, tid); + return; + } + + if (getregs_supplies (regno)) + { + fetch_regs (regcache, tid); + return; + } + + if (getfpregs_supplies (regno)) + { + 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 +m68k_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) + { + old_store_inferior_registers (regcache, regno); + 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_SETFPREGS requests whenever possible, since it + transfers more registers in one system call. But remember that + store_fpregs can fail, and return zero. */ + if (regno == -1) + { + store_regs (regcache, tid, regno); + store_fpregs (regcache, tid, regno); + return; + } + + if (getregs_supplies (regno)) + { + store_regs (regcache, tid, regno); + return; + } + + if (getfpregs_supplies (regno)) + { + store_fpregs (regcache, tid, regno); + return; + } + + internal_error (__FILE__, __LINE__, + _("Got request to store bad register number %d."), regno); +} + +/* Interpreting register set info found in core files. */ + +/* Provide registers to GDB from a core file. + + (We can't use the generic version of this function in + core-regset.c, because we need to use elf_gregset_t instead of + gregset_t.) + + CORE_REG_SECT points to an array of bytes, which are the contents + of a `note' from a core file which BFD thinks might contain + register contents. CORE_REG_SIZE is its size. + + WHICH says which register set corelow suspects this is: + 0 --- the general-purpose register set, in elf_gregset_t format + 2 --- the floating-point register set, in elf_fpregset_t format + + REG_ADDR isn't used on GNU/Linux. */ + +static void +fetch_core_registers (struct regcache *regcache, + char *core_reg_sect, unsigned core_reg_size, + int which, CORE_ADDR reg_addr) +{ + elf_gregset_t gregset; + elf_fpregset_t fpregset; + + switch (which) + { + case 0: + if (core_reg_size != sizeof (gregset)) + warning (_("Wrong size gregset in core file.")); + else + { + memcpy (&gregset, core_reg_sect, sizeof (gregset)); + supply_gregset (regcache, (const elf_gregset_t *) &gregset); + } + break; + + case 2: + if (core_reg_size != sizeof (fpregset)) + warning (_("Wrong size fpregset in core file.")); + else + { + memcpy (&fpregset, core_reg_sect, sizeof (fpregset)); + supply_fpregset (regcache, (const elf_fpregset_t *) &fpregset); + } + break; + + default: + /* We've covered all the kinds of registers we know about here, + so this must be something we wouldn't know what to do with + anyway. Just ignore it. */ + break; + } +} + + +/* Fetch the thread-local storage pointer for libthread_db. */ + +ps_err_e +ps_get_thread_area (const struct ps_prochandle *ph, + lwpid_t lwpid, int idx, void **base) +{ + if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) < 0) + return PS_ERR; + + /* IDX is the bias from the thread pointer to the beginning of the + thread descriptor. It has to be subtracted due to implementation + quirks in libthread_db. */ + *base = (char *) *base - idx; + + return PS_OK; } -/* Return non-zero if PC points into the signal trampoline. */ - -int -in_sigtramp (pc) - CORE_ADDR pc; -{ - CORE_ADDR sp; - char buf[TARGET_SHORT_BIT / TARGET_CHAR_BIT]; - int insn; - - sp = read_register (SP_REGNUM); - if (pc - 2 < sp) - return 0; - - if (read_memory_nobpt (pc, buf, sizeof (buf))) - return 0; - insn = extract_unsigned_integer (buf, sizeof (buf)); - if (insn == 0xdefc /* addaw #,sp */ - || insn == 0x7077 /* moveq #119,d0 */ - || insn == 0x4e40 /* trap #0 */ - || insn == 0x203c /* movel #,d0 */ ) - return 1; - - if (read_memory_nobpt (pc - 2, buf, sizeof (buf))) - return 0; - insn = extract_unsigned_integer (buf, sizeof (buf)); - if (insn == 0xdefc /* addaw #,sp */ - || insn == 0x7077 /* moveq #119,d0 */ - || insn == 0x4e40 /* trap #0 */ - || insn == 0x203c /* movel #,d0 */ ) - return 1; - - return 0; + +/* Register that we are able to handle GNU/Linux ELF core file + formats. */ + +static struct core_fns linux_elf_core_fns = +{ + bfd_target_elf_flavour, /* core_flavour */ + default_check_format, /* check_format */ + default_core_sniffer, /* core_sniffer */ + fetch_core_registers, /* core_read_registers */ + NULL /* next */ +}; + +void _initialize_m68k_linux_nat (void); + +void +_initialize_m68k_linux_nat (void) +{ + struct target_ops *t; + + /* Fill in the generic GNU/Linux methods. */ + t = linux_target (); + + /* Add our register access methods. */ + t->to_fetch_registers = m68k_linux_fetch_inferior_registers; + t->to_store_registers = m68k_linux_store_inferior_registers; + + /* Register the target. */ + linux_nat_add_target (t); + + deprecated_add_core_fns (&linux_elf_core_fns); }