X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Fi386gnu-nat.c;h=e14a181564fd819eafaa0408ee6bab42a97d620f;hb=f166f943f30a91792e8754cbca9d7652fc400aae;hp=6ed92c167f5da85e5b28d15053a504364204dfbd;hpb=5b64ad42d36e6d487e1f7287d37fbc243a178e72;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/i386gnu-nat.c b/gdb/i386gnu-nat.c index 6ed92c167f..e14a181564 100644 --- a/gdb/i386gnu-nat.c +++ b/gdb/i386gnu-nat.c @@ -1,357 +1,436 @@ -/* Low level interface to I386 running the GNU Hurd - Copyright (C) 1992, 1995, 1996 Free Software Foundation, Inc. +/* Low level interface to i386 running the GNU Hurd. -This file is part of GDB. + Copyright (C) 1992-2016 Free Software Foundation, Inc. -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 file is part of GDB. -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. + 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. -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. */ + 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 . */ #include "defs.h" +#include "x86-nat.h" #include "inferior.h" #include "floatformat.h" - -#include -#include +#include "regcache.h" #include +#include #include #include -#include + +#include "i386-tdep.h" #include "gnu-nat.h" +#include "inf-child.h" +#include "i387-tdep.h" -/* Hmmm... Should this not be here? - * Now for i386_float_info() target_has_execution - */ -#include +/* Offset to the thread_state_t location where REG is stored. */ +#define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg) -/* @@@ Should move print_387_status() to i387-tdep.c */ -extern void print_387_control_word (); /* i387-tdep.h */ -extern void print_387_status_word (); - -/* Find offsets to thread states at compile time. - * If your compiler does not grok this, calculate offsets - * offsets yourself and use them (or get a compatible compiler :-) - */ +/* At REG_OFFSET[N] is the offset to the thread_state_t location where + the GDB register N is stored. */ +static int reg_offset[] = +{ + REG_OFFSET (eax), REG_OFFSET (ecx), REG_OFFSET (edx), REG_OFFSET (ebx), + REG_OFFSET (uesp), REG_OFFSET (ebp), REG_OFFSET (esi), REG_OFFSET (edi), + REG_OFFSET (eip), REG_OFFSET (efl), REG_OFFSET (cs), REG_OFFSET (ss), + REG_OFFSET (ds), REG_OFFSET (es), REG_OFFSET (fs), REG_OFFSET (gs) +}; -#define REG_OFFSET(reg) (int)(&((struct i386_thread_state *)0)->reg) +#define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum]) -/* at reg_offset[i] is the offset to the i386_thread_state - * location where the gdb registers[i] is stored. - */ + +/* Get the whole floating-point state of THREAD and record the values + of the corresponding (pseudo) registers. */ -static int reg_offset[] = +static void +fetch_fpregs (struct regcache *regcache, struct proc *thread) { - REG_OFFSET(eax), REG_OFFSET(ecx), REG_OFFSET(edx), REG_OFFSET(ebx), - REG_OFFSET(uesp), REG_OFFSET(ebp), REG_OFFSET(esi), REG_OFFSET(edi), - REG_OFFSET(eip), REG_OFFSET(efl), REG_OFFSET(cs), REG_OFFSET(ss), - REG_OFFSET(ds), REG_OFFSET(es), REG_OFFSET(fs), REG_OFFSET(gs) -}; + mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT; + struct i386_float_state state; + error_t err; -#define REG_ADDR(state,regnum) ((char *)(state)+reg_offset[regnum]) - -/* Fetch COUNT contiguous registers from thread STATE starting from REGNUM - * Caller knows that the regs handled in one transaction are of same size. - */ -#define FETCH_REGS(state, regnum, count) \ - memcpy (®isters[REGISTER_BYTE (regnum)], \ - REG_ADDR (state, regnum), \ - count * REGISTER_RAW_SIZE (regnum)) - -/* Store COUNT contiguous registers to thread STATE starting from REGNUM */ -#define STORE_REGS(state, regnum, count) \ - memcpy (REG_ADDR (state, regnum), \ - ®isters[REGISTER_BYTE (regnum)], \ - count * REGISTER_RAW_SIZE (regnum)) - -/* - * Fetch inferiors registers for gdb. - * REG specifies which (as gdb views it) register, -1 for all. - */ -void -gnu_fetch_registers (int reg) + err = thread_get_state (thread->port, i386_FLOAT_STATE, + (thread_state_t) &state, &count); + if (err) + { + warning (_("Couldn't fetch floating-point state from %s"), + proc_string (thread)); + return; + } + + if (!state.initialized) + { + /* The floating-point state isn't initialized. */ + i387_supply_fsave (regcache, -1, NULL); + } + else + { + /* Supply the floating-point registers. */ + i387_supply_fsave (regcache, -1, state.hw_state); + } +} + +/* Fetch register REGNO, or all regs if REGNO is -1. */ +static void +gnu_fetch_registers (struct target_ops *ops, + struct regcache *regcache, int regno) { struct proc *thread; - thread_state_t state; - - inf_update_procs (current_inferior); /* Make sure we know about new threads. */ - thread = inf_tid_to_thread (current_inferior, inferior_pid); - if (! thread) - error ("fetch inferior registers: %d: Invalid thread", inferior_pid); + /* Make sure we know about new threads. */ + inf_update_procs (gnu_current_inf); - state = proc_get_state (thread, 0); + thread = inf_tid_to_thread (gnu_current_inf, + ptid_get_lwp (inferior_ptid)); + if (!thread) + error (_("Can't fetch registers from thread %s: No such thread"), + target_pid_to_str (inferior_ptid)); - if (! state) - warning ("Couldn't fetch register %s from %s (invalid thread).", - REGISTER_NAME (reg), proc_string (thread)); - else if (reg >= 0) + if (regno < I386_NUM_GREGS || regno == -1) { - proc_debug (thread, "fetching register: %s", REGISTER_NAME (reg)); - supply_register (reg, REG_ADDR(state, reg)); - thread->fetched_regs |= (1 << reg); + thread_state_t state; + + /* This does the dirty work for us. */ + state = proc_get_state (thread, 0); + if (!state) + { + warning (_("Couldn't fetch registers from %s"), + proc_string (thread)); + return; + } + + if (regno == -1) + { + int i; + + proc_debug (thread, "fetching all register"); + + for (i = 0; i < I386_NUM_GREGS; i++) + regcache_raw_supply (regcache, i, REG_ADDR (state, i)); + thread->fetched_regs = ~0; + } + else + { + proc_debug (thread, "fetching register %s", + gdbarch_register_name (get_regcache_arch (regcache), + regno)); + + regcache_raw_supply (regcache, regno, + REG_ADDR (state, regno)); + thread->fetched_regs |= (1 << regno); + } } - else + + if (regno >= I386_NUM_GREGS || regno == -1) { - proc_debug (thread, "fetching all registers"); - for (reg = 0; reg < NUM_REGS; reg++) - supply_register (reg, REG_ADDR(state, reg)); - thread->fetched_regs = ~0; + proc_debug (thread, "fetching floating-point registers"); + + fetch_fpregs (regcache, thread); } } -/* Store our register values back into the inferior. - * If REG is -1, do this for all registers. - * Otherwise, REG specifies which register - * - * On mach3 all registers are always saved in one call. - */ -void -gnu_store_registers (reg) - int reg; + +/* Store the whole floating-point state into THREAD using information + from the corresponding (pseudo) registers. */ +static void +store_fpregs (const struct regcache *regcache, struct proc *thread, int regno) { - struct proc *thread; - int was_aborted, was_valid; - thread_state_t state; - thread_state_data_t old_state; - - inf_update_procs (current_inferior); /* Make sure we know about new threads. */ + mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT; + struct i386_float_state state; + error_t err; - thread = inf_tid_to_thread (current_inferior, inferior_pid); - if (! thread) - error ("store inferior registers: %d: Invalid thread", inferior_pid); + err = thread_get_state (thread->port, i386_FLOAT_STATE, + (thread_state_t) &state, &count); + if (err) + { + warning (_("Couldn't fetch floating-point state from %s"), + proc_string (thread)); + return; + } + + /* FIXME: kettenis/2001-07-15: Is this right? Should we somehow + take into account DEPRECATED_REGISTER_VALID like the old code did? */ + i387_collect_fsave (regcache, regno, state.hw_state); + + err = thread_set_state (thread->port, i386_FLOAT_STATE, + (thread_state_t) &state, i386_FLOAT_STATE_COUNT); + if (err) + { + warning (_("Couldn't store floating-point state into %s"), + proc_string (thread)); + return; + } +} - proc_debug (thread, "storing register %s.", REGISTER_NAME (reg)); +/* Store at least register REGNO, or all regs if REGNO == -1. */ +static void +gnu_store_registers (struct target_ops *ops, + struct regcache *regcache, int regno) +{ + struct proc *thread; + struct gdbarch *gdbarch = get_regcache_arch (regcache); - was_aborted = thread->aborted; - was_valid = thread->state_valid; - if (! was_aborted && was_valid) - bcopy (&thread->state, &old_state, sizeof (old_state)); + /* Make sure we know about new threads. */ + inf_update_procs (gnu_current_inf); - state = proc_get_state (thread, 1); + thread = inf_tid_to_thread (gnu_current_inf, + ptid_get_lwp (inferior_ptid)); + if (!thread) + error (_("Couldn't store registers into thread %s: No such thread"), + target_pid_to_str (inferior_ptid)); - if (! state) - warning ("Couldn't store register %s from %s (invalid thread).", - REGISTER_NAME (reg), proc_string (thread)); - else + if (regno < I386_NUM_GREGS || regno == -1) { - if (! was_aborted && was_valid) + thread_state_t state; + thread_state_data_t old_state; + int was_aborted = thread->aborted; + int was_valid = thread->state_valid; + int trace; + + if (!was_aborted && was_valid) + memcpy (&old_state, &thread->state, sizeof (old_state)); + + state = proc_get_state (thread, 1); + if (!state) + { + warning (_("Couldn't store registers into %s"), + proc_string (thread)); + return; + } + + /* Save the T bit. We might try to restore the %eflags register + below, but changing the T bit would seriously confuse GDB. */ + trace = ((struct i386_thread_state *)state)->efl & 0x100; + + if (!was_aborted && was_valid) /* See which registers have changed after aborting the thread. */ { - int check_reg; - for (check_reg = 0; check_reg < NUM_REGS; check_reg++) - if ((thread->fetched_regs & (1 << check_reg)) - && bcmp (REG_ADDR (&old_state, check_reg), - REG_ADDR (state, check_reg), - REGISTER_RAW_SIZE (check_reg))) - /* Register CHECK_REG has changed! Ack! */ + int check_regno; + + for (check_regno = 0; check_regno < I386_NUM_GREGS; check_regno++) + if ((thread->fetched_regs & (1 << check_regno)) + && memcpy (REG_ADDR (&old_state, check_regno), + REG_ADDR (state, check_regno), + register_size (gdbarch, check_regno))) + /* Register CHECK_REGNO has changed! Ack! */ { - warning ("Register %s changed after thread was aborted.", - REGISTER_NAME (check_reg)); - if (reg >= 0 && reg != check_reg) - /* Update gdb's copy of the register. */ - supply_register (check_reg, REG_ADDR (state, check_reg)); + warning (_("Register %s changed after the thread was aborted"), + gdbarch_register_name (gdbarch, check_regno)); + if (regno >= 0 && regno != check_regno) + /* Update GDB's copy of the register. */ + regcache_raw_supply (regcache, check_regno, + REG_ADDR (state, check_regno)); else - warning ("... also writing this register! Suspicious..."); + warning (_("... also writing this register! " + "Suspicious...")); } } - if (reg >= 0) + if (regno == -1) { - proc_debug (thread, "storing register: %s", REGISTER_NAME (reg)); - STORE_REGS (state, reg, 1); + int i; + + proc_debug (thread, "storing all registers"); + + for (i = 0; i < I386_NUM_GREGS; i++) + if (REG_VALID == regcache_register_status (regcache, i)) + regcache_raw_collect (regcache, i, REG_ADDR (state, i)); } else { - proc_debug (thread, "storing all registers"); - for (reg = 0; reg < NUM_REGS; reg++) - STORE_REGS (state, reg, 1); + proc_debug (thread, "storing register %s", + gdbarch_register_name (gdbarch, regno)); + + gdb_assert (REG_VALID == regcache_register_status (regcache, regno)); + regcache_raw_collect (regcache, regno, REG_ADDR (state, regno)); } + + /* Restore the T bit. */ + ((struct i386_thread_state *)state)->efl &= ~0x100; + ((struct i386_thread_state *)state)->efl |= trace; + } + + if (regno >= I386_NUM_GREGS || regno == -1) + { + proc_debug (thread, "storing floating-point registers"); + + store_fpregs (regcache, thread, regno); } } + -/* jtv@hut.fi: I copied and modified this 387 code from - * gdb/i386-xdep.c. Modifications for Mach 3.0. - * - * i387 status dumper. See also i387-tdep.c - */ -struct env387 +/* Support for debug registers. */ + +#ifdef i386_DEBUG_STATE +/* Get debug registers for thread THREAD. */ + +static void +i386_gnu_dr_get (struct i386_debug_state *regs, struct proc *thread) +{ + mach_msg_type_number_t count = i386_DEBUG_STATE_COUNT; + error_t err; + + err = thread_get_state (thread->port, i386_DEBUG_STATE, + (thread_state_t) regs, &count); + if (err != 0 || count != i386_DEBUG_STATE_COUNT) + warning (_("Couldn't fetch debug state from %s"), + proc_string (thread)); +} + +/* Set debug registers for thread THREAD. */ + +static void +i386_gnu_dr_set (const struct i386_debug_state *regs, struct proc *thread) +{ + error_t err; + + err = thread_set_state (thread->port, i386_DEBUG_STATE, + (thread_state_t) regs, i386_DEBUG_STATE_COUNT); + if (err != 0) + warning (_("Couldn't store debug state into %s"), + proc_string (thread)); +} + +/* Set DR_CONTROL in THREAD. */ + +static void +i386_gnu_dr_set_control_one (struct proc *thread, void *arg) +{ + unsigned long *control = arg; + struct i386_debug_state regs; + + i386_gnu_dr_get (®s, thread); + regs.dr[DR_CONTROL] = *control; + i386_gnu_dr_set (®s, thread); +} + +/* Set DR_CONTROL to CONTROL in all threads. */ + +static void +i386_gnu_dr_set_control (unsigned long control) +{ + inf_update_procs (gnu_current_inf); + inf_threads (gnu_current_inf, i386_gnu_dr_set_control_one, &control); +} + +/* Parameters to set a debugging address. */ + +struct reg_addr { - unsigned short control; - unsigned short r0; - unsigned short status; - unsigned short r1; - unsigned short tag; - unsigned short r2; - unsigned long eip; - unsigned short code_seg; - unsigned short opcode; - unsigned long operand; - unsigned short operand_seg; - unsigned short r3; - unsigned char regs[8][10]; + int regnum; /* Register number (zero based). */ + CORE_ADDR addr; /* Address. */ }; -/* This routine is machine independent? - * Should move it to i387-tdep.c but you need to export struct env387 - */ -static -print_387_status (status, ep) - unsigned short status; - struct env387 *ep; + +/* Set address REGNUM (zero based) to ADDR in THREAD. */ + +static void +i386_gnu_dr_set_addr_one (struct proc *thread, void *arg) { - int i; - int bothstatus; - int top; - int fpreg; - unsigned char *p; - - bothstatus = ((status != 0) && (ep->status != 0)); - if (status != 0) - { - if (bothstatus) - printf_unfiltered ("u: "); - print_387_status_word (status); - } - - if (ep->status != 0) - { - if (bothstatus) - printf_unfiltered ("e: "); - print_387_status_word (ep->status); - } - - print_387_control_word (ep->control); - printf_unfiltered ("last exception: "); - printf_unfiltered ("opcode %s; ", local_hex_string(ep->opcode)); - printf_unfiltered ("pc %s:", local_hex_string(ep->code_seg)); - printf_unfiltered ("%s; ", local_hex_string(ep->eip)); - printf_unfiltered ("operand %s", local_hex_string(ep->operand_seg)); - printf_unfiltered (":%s\n", local_hex_string(ep->operand)); - - top = (ep->status >> 11) & 7; - - printf_unfiltered ("regno tag msb lsb value\n"); - for (fpreg = 7; fpreg >= 0; fpreg--) - { - double val; - - printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg); - - switch ((ep->tag >> (fpreg * 2)) & 3) - { - case 0: printf_unfiltered ("valid "); break; - case 1: printf_unfiltered ("zero "); break; - case 2: printf_unfiltered ("trap "); break; - case 3: printf_unfiltered ("empty "); break; - } - for (i = 9; i >= 0; i--) - printf_unfiltered ("%02x", ep->regs[fpreg][i]); - - floatformat_to_double (&floatformat_i387_ext, (char *)ep->regs[fpreg], - &val); - printf_unfiltered (" %g\n", val); - } - if (ep->r0) - printf_unfiltered ("warning: reserved0 is %s\n", local_hex_string(ep->r0)); - if (ep->r1) - printf_unfiltered ("warning: reserved1 is %s\n", local_hex_string(ep->r1)); - if (ep->r2) - printf_unfiltered ("warning: reserved2 is %s\n", local_hex_string(ep->r2)); - if (ep->r3) - printf_unfiltered ("warning: reserved3 is %s\n", local_hex_string(ep->r3)); + struct reg_addr *reg_addr = arg; + struct i386_debug_state regs; + + i386_gnu_dr_get (®s, thread); + regs.dr[reg_addr->regnum] = reg_addr->addr; + i386_gnu_dr_set (®s, thread); } - -/* - * values that go into fp_kind (from ) - */ -#define FP_NO 0 /* no fp chip, no emulator (no fp support) */ -#define FP_SW 1 /* no fp chip, using software emulator */ -#define FP_HW 2 /* chip present bit */ -#define FP_287 2 /* 80287 chip present */ -#define FP_387 3 /* 80387 chip present */ - -typedef struct fpstate { -#if 1 - unsigned char state[FP_STATE_BYTES]; /* "hardware" state */ -#else - struct env387 state; /* Actually this */ -#endif - int status; /* Duplicate status */ -} *fpstate_t; - -/* Mach 3 specific routines. - */ -static int -get_i387_state (fstate) - struct fpstate *fstate; + +/* Set address REGNUM (zero based) to ADDR in all threads. */ + +static void +i386_gnu_dr_set_addr (int regnum, CORE_ADDR addr) { - error_t err; - thread_state_data_t state; - unsigned int fsCnt = i386_FLOAT_STATE_COUNT; - struct i386_float_state *fsp; - struct proc *thread = inf_tid_to_thread (current_inferior, inferior_pid); - - if (!thread) - error ("get_i387_state: Invalid thread"); + struct reg_addr reg_addr; - proc_abort (thread, 0); /* Make sure THREAD's in a reasonable state. */ + gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR); - err = thread_get_state (thread->port, i386_FLOAT_STATE, state, &fsCnt); - if (err) - { - warning ("Can not get live floating point state: %s", - mach_error_string (err)); - return 0; - } + reg_addr.regnum = regnum; + reg_addr.addr = addr; + + inf_update_procs (gnu_current_inf); + inf_threads (gnu_current_inf, i386_gnu_dr_set_addr_one, ®_addr); +} - fsp = (struct i386_float_state *)state; - /* The 387 chip (also 486 counts) or a software emulator? */ - if (!fsp->initialized || (fsp->fpkind != FP_387 && fsp->fpkind != FP_SW)) - return 0; +/* Get debug register REGNUM value from only the one LWP of PTID. */ - /* Clear the target then copy thread's float state there. - Make a copy of the status word, for some reason? - */ - memset (fstate, 0, sizeof (struct fpstate)); +static unsigned long +i386_gnu_dr_get_reg (ptid_t ptid, int regnum) +{ + struct i386_debug_state regs; + struct proc *thread; - fstate->status = fsp->exc_status; + /* Make sure we know about new threads. */ + inf_update_procs (gnu_current_inf); - memcpy (fstate->state, (char *)&fsp->hw_state, FP_STATE_BYTES); + thread = inf_tid_to_thread (gnu_current_inf, ptid_get_lwp (ptid)); + i386_gnu_dr_get (®s, thread); - return 1; + return regs.dr[regnum]; } -/* - * This is called by "info float" command - */ +/* Return the inferior's debug register REGNUM. */ + +static CORE_ADDR +i386_gnu_dr_get_addr (int regnum) +{ + gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR); + + return i386_gnu_dr_get_reg (inferior_ptid, regnum); +} + +/* Get DR_STATUS from only the one thread of INFERIOR_PTID. */ + +static unsigned long +i386_gnu_dr_get_status (void) +{ + return i386_gnu_dr_get_reg (inferior_ptid, DR_STATUS); +} + +/* Return the inferior's DR7 debug control register. */ + +static unsigned long +i386_gnu_dr_get_control (void) +{ + return i386_gnu_dr_get_reg (inferior_ptid, DR_CONTROL); +} +#endif /* i386_DEBUG_STATE */ + +/* Provide a prototype to silence -Wmissing-prototypes. */ +extern initialize_file_ftype _initialize_i386gnu_nat; + void -i386_mach3_float_info() +_initialize_i386gnu_nat (void) { - char buf [sizeof (struct fpstate) + 2 * sizeof (int)]; - int valid = 0; - fpstate_t fps; - - if (target_has_execution) - valid = get_i387_state (buf); - - if (!valid) - { - warning ("no floating point status saved"); - return; - } - - fps = (fpstate_t) buf; + struct target_ops *t; + + /* Fill in the generic GNU/Hurd methods. */ + t = gnu_target (); + +#ifdef i386_DEBUG_STATE + x86_use_watchpoints (t); + + x86_dr_low.set_control = i386_gnu_dr_set_control; + gdb_assert (DR_FIRSTADDR == 0 && DR_LASTADDR < i386_DEBUG_STATE_COUNT); + x86_dr_low.set_addr = i386_gnu_dr_set_addr; + x86_dr_low.get_addr = i386_gnu_dr_get_addr; + x86_dr_low.get_status = i386_gnu_dr_get_status; + x86_dr_low.get_control = i386_gnu_dr_get_control; + x86_set_debug_register_length (4); +#endif /* i386_DEBUG_STATE */ + + t->to_fetch_registers = gnu_fetch_registers; + t->to_store_registers = gnu_store_registers; - print_387_status (fps->status, (struct env387 *)fps->state); + /* Register the target. */ + add_target (t); }