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-rw-r--r--gdb/i386gnu-nat.c502
1 files changed, 233 insertions, 269 deletions
diff --git a/gdb/i386gnu-nat.c b/gdb/i386gnu-nat.c
index 6834ea0..bc13229 100644
--- a/gdb/i386gnu-nat.c
+++ b/gdb/i386gnu-nat.c
@@ -1,4 +1,4 @@
-/* Low level interface to I386 running the GNU Hurd
+/* Low level interface to i386 running the GNU Hurd.
Copyright (C) 1992, 1995, 1996 Free Software Foundation, Inc.
This file is part of GDB.
@@ -22,36 +22,41 @@
#include "inferior.h"
#include "floatformat.h"
+#include <assert.h>
#include <stdio.h>
#include <errno.h>
#include <mach.h>
+#include <mach_error.h>
#include <mach/message.h>
#include <mach/exception.h>
-#include <mach_error.h>
#include "gnu-nat.h"
-/* Hmmm... Should this not be here?
- * Now for i386_float_info() target_has_execution
- */
-#include <target.h>
+/* 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)
-
-/* at reg_offset[i] is the offset to the i386_thread_state
- * location where the gdb registers[i] is stored.
- */
+/* 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 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),
@@ -60,309 +65,268 @@ static int reg_offset[] =
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 (&registers[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), \
- &registers[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)
{
- 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);
-
- 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 from %s (invalid thread).",
- REGISTER_NAME (reg), proc_string (thread));
- 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", REGISTER_NAME (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)
{
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. */
+ /* Make sure we know about new threads. */
+ inf_update_procs (current_inferior);
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.", REGISTER_NAME (reg));
+ error ("Can't fetch registers from thread %d: No such thread",
+ inferior_pid);
- was_aborted = thread->aborted;
- was_valid = thread->state_valid;
- if (!was_aborted && was_valid)
- bcopy (&thread->state, &old_state, sizeof (old_state));
-
- state = proc_get_state (thread, 1);
-
- if (!state)
- warning ("Couldn't store register %s from %s (invalid thread).",
- REGISTER_NAME (reg), proc_string (thread));
- 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.",
- 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));
- 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", REGISTER_NAME (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], &regs[REGISTER_BYTE (FP0_REGNUM + i)],
+ REGISTER_RAW_SIZE (FP0_REGNUM + i));
+
+#define fill(member, regno) \
+ if (!valid || valid[(regno)]) \
+ memcpy (&ep->member, &regs[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 *) &registers[REGISTER_BYTE (FCS_REGNUM)] & 0xffff);
+
+ if (!valid || valid[FOP_REGNUM])
+ ep->opcode =
+ ((* (int *) &registers[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;
- if (ep->status != 0)
+ 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 <i386/fpreg.h>)
- */
-#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
+/* Store at least register REGNO, or all regs if REGNO == -1. */
+void
+gnu_store_registers (int regno)
{
-#if 1
- unsigned char state[FP_STATE_BYTES]; /* "hardware" state */
-#else
- struct env387 state; /* Actually this */
-#endif
- int status; /* Duplicate status */
-}
- *fpstate_t;
+ struct proc *thread;
-/* Mach 3 specific routines.
- */
-static int
-get_i387_state (fstate)
- struct fpstate *fstate;
-{
- 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);
+ /* Make sure we know about new threads. */
+ inf_update_procs (current_inferior);
+ thread = inf_tid_to_thread (current_inferior, inferior_pid);
if (!thread)
- error ("get_i387_state: Invalid thread");
-
- proc_abort (thread, 0); /* Make sure THREAD's in a reasonable state. */
+ error ("Couldn't store registers into thread %d: No such thread",
+ inferior_pid);
- err = thread_get_state (thread->port, i386_FLOAT_STATE, state, &fsCnt);
- if (err)
+ 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;
- 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;
-
- /* 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));
+ if (!was_aborted && was_valid)
+ memcpy (&old_state, &thread->state, sizeof (old_state));
- fstate->status = fsp->exc_status;
+ state = proc_get_state (thread, 1);
+ if (!state)
+ {
+ warning ("Couldn't store registers into %s", proc_string (thread));
+ return;
+ }
- 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), &registers[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 (regno == -1)
+ {
+ int i;
+
+ proc_debug (thread, "storing all registers");
- if (target_has_execution)
- valid = get_i387_state (buf);
+ for (i = 0; i < NUM_GREGS; i++)
+ if (register_valid[i])
+ fill (state, i);
+ }
+ else
+ {
+ proc_debug (thread, "storing register %s", REGISTER_NAME (regno));
- if (!valid)
- {
- warning ("no floating point status saved");
- return;
+ assert (register_valid[regno]);
+ fill (state, regno);
+ }
}
- fps = (fpstate_t) buf;
+#undef fill
- print_387_status (fps->status, (struct env387 *) fps->state);
+ if (regno >= NUM_GREGS || regno == -1)
+ {
+ proc_debug (thread, "storing floating-point registers");
+
+ store_fpregs (thread);
+ }
}
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