X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Fi386gnu-nat.c;h=7554d1aed2cccc0d3bde558ff603f8d079181782;hb=4b14d3e4e0d9ba2ff2f9397312f884f8fc9a1135;hp=63c3bd0d7d8afbf44f76c5d49483c73107f09064;hpb=ce0787ef686e0d804fec34a3bc5acd2aaafcbb49;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/i386gnu-nat.c b/gdb/i386gnu-nat.c index 63c3bd0d7d..7554d1aed2 100644 --- a/gdb/i386gnu-nat.c +++ b/gdb/i386gnu-nat.c @@ -1,348 +1,341 @@ -/* Low level interface to I386 running the GNU Hurd - Copyright (C) 1992 Free Software Foundation, Inc. +/* Low level interface to i386 running the GNU Hurd. + Copyright (C) 1992, 1995, 1996, 2000 Free Software Foundation, Inc. -This file is part of GDB. + 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 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. + 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. */ + 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 "floatformat.h" +#include #include +#include #include +#include #include #include -#include #include "gnu-nat.h" -/* Hmmm... Should this not be here? - * Now for i386_float_info() target_has_execution - */ -#include +/* The FPU hardware state. */ +struct env387 +{ + 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]; +}; -/* @@@ 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 :-) - */ - -#define REG_OFFSET(reg) (int)(&((struct i386_thread_state *)0)->reg) +/* Offset to the thread_state_t location where REG is stored. */ +#define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg) -/* at reg_offset[i] is the offset to the i386_thread_state - * location where the gdb registers[i] is stored. - */ - -static int reg_offset[] = +/* At reg_offset[i] is the offset to the thread_state_t location where + the gdb registers[i] 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) + 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_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)) +#define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum]) + -/* - * Fetch inferiors registers for gdb. - * REG specifies which (as gdb views it) register, -1 for all. - */ -void -gnu_fetch_registers (int reg) +/* Get the whole floating-point state of THREAD and record the + values of the corresponding (pseudo) registers. */ +static void +fetch_fpregs (struct proc *thread) { - thread_state_t state; - struct proc *thread = inf_tid_to_thread (current_inferior, inferior_pid); - - if (!thread) - error ("fetch inferior registers: %d: Invalid thread", inferior_pid); - - state = proc_get_state (thread, 0); + mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT; + struct i386_float_state state; + struct env387 *ep = (struct env387 *) state.hw_state; + error_t err; + int i; - if (! state) - warning ("Couldn't fetch register %s.", reg_names[reg]); - else if (reg >= 0) + err = thread_get_state (thread->port, i386_FLOAT_STATE, + (thread_state_t) &state, &count); + if (err) { - proc_debug (thread, "fetching register: %s", reg_names[reg]); - supply_register (reg, REG_ADDR(state, reg)); - thread->fetched_regs |= (1 << reg); + warning ("Couldn't fetch floating-point state from %s", + proc_string (thread)); + return; } - else + + if (! state.initialized) + /* The floating-point state isn't initialized. */ { - proc_debug (thread, "fetching all registers"); - for (reg = 0; reg < NUM_REGS; reg++) - supply_register (reg, REG_ADDR(state, reg)); - thread->fetched_regs = ~0; + for (i = FP0_REGNUM; i <= FP7_REGNUM; i++) + supply_register (i, NULL); + for (i = FIRST_FPU_CTRL_REGNUM; i <= LAST_FPU_CTRL_REGNUM; i++) + supply_register (i, NULL); + + return; } + + /* Supply the floating-point registers. */ + for (i = 0; i < 8; i++) + supply_register (FP0_REGNUM + i, ep->regs[i]); + + supply_register (FCTRL_REGNUM, (char *) &ep->control); + supply_register (FSTAT_REGNUM, (char *) &ep->status); + supply_register (FTAG_REGNUM, (char *) &ep->tag); + supply_register (FCOFF_REGNUM, (char *) &ep->eip); + supply_register (FDS_REGNUM, (char *) &ep->operand_seg); + supply_register (FDOFF_REGNUM, (char *) &ep->operand); + + /* Store the code segment and opcode pseudo registers. */ + { + long l; + + l = ep->code_seg; + supply_register (FCS_REGNUM, (char *) &l); + l = ep->opcode & ((1 << 11) - 1); + supply_register (FOP_REGNUM, (char *) &l); + } } - -/* 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. - */ + +/* Fetch register REGNO, or all regs if REGNO is -1. */ void -gnu_store_registers (reg) - int reg; +gnu_fetch_registers (int regno) { - int was_aborted, was_valid; - thread_state_t state; - thread_state_data_t old_state; - struct proc *thread = inf_tid_to_thread (current_inferior, inferior_pid); - - if (! thread) - error ("store inferior registers: %d: Invalid thread", inferior_pid); - - proc_debug (thread, "storing register %s.", reg_names[reg]); + struct proc *thread; - 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 (current_inferior); - state = proc_get_state (thread, 1); + thread = inf_tid_to_thread (current_inferior, inferior_pid); + if (!thread) + error ("Can't fetch registers from thread %d: No such thread", + inferior_pid); - if (! state) - warning ("Couldn't store register %s.", reg_names[reg]); - else + if (regno < NUM_GREGS || regno == -1) { - if (! was_aborted && was_valid) - /* See which registers have changed after aborting the thread. */ + thread_state_t state; + + /* This does the dirty work for us. */ + state = proc_get_state (thread, 0); + if (!state) { - 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! */ - { - warning ("Register %s changed after thread was aborted.", - reg_names [check_reg]); - if (reg >= 0 && reg != check_reg) - /* Update gdb's copy of the register. */ - supply_register (check_reg, REG_ADDR (state, check_reg)); - else - warning ("... also writing this register! Suspicious..."); - } + warning ("Couldn't fetch registers from %s", + proc_string (thread)); + return; } - if (reg >= 0) + if (regno == -1) { - proc_debug (thread, "storing register: %s", reg_names[reg]); - STORE_REGS (state, reg, 1); + int i; + + proc_debug (thread, "fetching all register"); + + for (i = 0; i < NUM_GREGS; i++) + supply_register (i, REG_ADDR (state, i)); + thread->fetched_regs = ~0; } else { - proc_debug (thread, "storing all registers"); - for (reg = 0; reg < NUM_REGS; reg++) - STORE_REGS (state, reg, 1); + proc_debug (thread, "fetching register %s", REGISTER_NAME (regno)); + + supply_register (regno, REG_ADDR (state, regno)); + thread->fetched_regs |= (1 << regno); } } + + if (regno >= NUM_GREGS || regno == -1) + { + proc_debug (thread, "fetching floating-point registers"); + + fetch_fpregs (thread); + } } + -/* 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 -{ - 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]; -}; -/* 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; +/* Fill the i387 hardware state EP with selected data from the set of + (pseudo) registers specified by REGS and VALID. VALID is an array + indicating which registers in REGS are valid. If VALID is zero, + all registers are assumed to be valid. */ +static void +convert_to_env387 (struct env387 *ep, char *regs, signed char *valid) { 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); - } + + /* Fill in the floating-point registers. */ + for (i = 0; i < 8; i++) + if (!valid || valid[i]) + memcpy (ep->regs[i], ®s[REGISTER_BYTE (FP0_REGNUM + i)], + REGISTER_RAW_SIZE (FP0_REGNUM + i)); + +#define fill(member, regno) \ + if (!valid || valid[(regno)]) \ + memcpy (&ep->member, ®s[REGISTER_BYTE (regno)], \ + sizeof (ep->member)); + + fill (control, FCTRL_REGNUM); + fill (status, FSTAT_REGNUM); + fill (tag, FTAG_REGNUM); + fill (eip, FCOFF_REGNUM); + fill (operand, FDOFF_REGNUM); + fill (operand_seg, FDS_REGNUM); + +#undef fill + + if (!valid || valid[FCS_REGNUM]) + ep->code_seg = + (* (int *) ®isters[REGISTER_BYTE (FCS_REGNUM)] & 0xffff); - if (ep->status != 0) + if (!valid || valid[FOP_REGNUM]) + ep->opcode = + ((* (int *) ®isters[REGISTER_BYTE (FOP_REGNUM)] & ((1 << 11) - 1))); +} + +/* Store the whole floating-point state into THREAD using information + from the corresponding (pseudo) registers. */ +static void +store_fpregs (struct proc *thread) +{ + mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT; + struct i386_float_state state; + error_t err; + + err = thread_get_state (thread->port, i386_FLOAT_STATE, + (thread_state_t) &state, &count); + if (err) { - if (bothstatus) - printf_unfiltered ("e: "); - print_387_status_word (ep->status); + warning ("Couldn't fetch floating-point state from %s", + proc_string (thread)); + return; } - - 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--) + + convert_to_env387 ((struct env387 *) state.hw_state, + registers, register_valid); + + err = thread_set_state (thread->port, i386_FLOAT_STATE, + (thread_state_t) &state, i386_FLOAT_STATE_COUNT); + if (err) { - 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); + warning ("Couldn't store floating-point state into %s", + proc_string (thread)); + return; } - 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)); } - -/* - * 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; + +/* Store at least register REGNO, or all regs if REGNO == -1. */ +void +gnu_store_registers (int regno) { - 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 proc *thread; - proc_abort (thread, 0); /* Make sure THREAD's in a reasonable state. */ + /* Make sure we know about new threads. */ + inf_update_procs (current_inferior); - err = thread_get_state (thread->port, i386_FLOAT_STATE, state, &fsCnt); - if (err) + thread = inf_tid_to_thread (current_inferior, inferior_pid); + if (!thread) + error ("Couldn't store registers into thread %d: No such thread", + inferior_pid); + + if (regno < NUM_GREGS || regno == -1) { - warning ("Can not get live floating point state: %s", - mach_error_string (err)); - return 0; - } + thread_state_t state; + thread_state_data_t old_state; + int was_aborted = thread->aborted; + int was_valid = thread->state_valid; + int trace; - 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; + if (!was_aborted && was_valid) + memcpy (&old_state, &thread->state, sizeof (old_state)); - /* 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)); + state = proc_get_state (thread, 1); + if (!state) + { + warning ("Couldn't store registers into %s", proc_string (thread)); + return; + } - fstate->status = fsp->exc_status; + /* 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; - memcpy (fstate->state, (char *)&fsp->hw_state, FP_STATE_BYTES); + if (!was_aborted && was_valid) + /* See which registers have changed after aborting the thread. */ + { + int check_regno; + + for (check_regno = 0; check_regno < NUM_GREGS; check_regno++) + if ((thread->fetched_regs & (1 << check_regno)) + && memcpy (REG_ADDR (&old_state, check_regno), + REG_ADDR (state, check_regno), + REGISTER_RAW_SIZE (check_regno))) + /* Register CHECK_REGNO has changed! Ack! */ + { + warning ("Register %s changed after the thread was aborted", + REGISTER_NAME (check_regno)); + if (regno >= 0 && regno != check_regno) + /* Update gdb's copy of the register. */ + supply_register (check_regno, REG_ADDR (state, check_regno)); + else + warning ("... also writing this register! Suspicious..."); + } + } - return 1; -} +#define fill(state, regno) \ + memcpy (REG_ADDR(state, regno), ®isters[REGISTER_BYTE (regno)], \ + REGISTER_RAW_SIZE (regno)) -/* - * This is called by "info float" command - */ -void -i386_mach3_float_info() -{ - char buf [sizeof (struct fpstate) + 2 * sizeof (int)]; - int valid = 0; - fpstate_t fps; - - if (target_has_execution) - valid = get_i387_state (buf); + if (regno == -1) + { + int i; + + proc_debug (thread, "storing all registers"); - if (!valid) - { - warning ("no floating point status saved"); - return; + for (i = 0; i < NUM_GREGS; i++) + if (register_valid[i]) + fill (state, i); + } + else + { + proc_debug (thread, "storing register %s", REGISTER_NAME (regno)); + + assert (register_valid[regno]); + fill (state, regno); + } + + /* Restore the T bit. */ + ((struct i386_thread_state *)state)->efl &= ~0x100; + ((struct i386_thread_state *)state)->efl |= trace; } - - fps = (fpstate_t) buf; - print_387_status (fps->status, (struct env387 *)fps->state); +#undef fill + + if (regno >= NUM_GREGS || regno == -1) + { + proc_debug (thread, "storing floating-point registers"); + + store_fpregs (thread); + } }