| /* Low level interface to I386 running mach 3.0. |
| Copyright (C) 1992 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 |
| (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. |
| |
| 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 <stdio.h> |
| |
| #include <mach.h> |
| #include <mach/message.h> |
| #include <mach/exception.h> |
| #include <mach_error.h> |
| |
| /* Hmmm... Should this not be here? |
| * Now for i386_float_info() target_has_execution |
| */ |
| #include <target.h> |
| |
| /* This mess is duplicated in bfd/i386mach3.h |
| |
| * This is an ugly way to hack around the incorrect |
| * definition of UPAGES in i386/machparam.h. |
| * |
| * The definition should specify the size reserved |
| * for "struct user" in core files in PAGES, |
| * but instead it gives it in 512-byte core-clicks |
| * for i386 and i860. |
| */ |
| #include <sys/param.h> |
| #if UPAGES == 16 |
| #define UAREA_SIZE ctob(UPAGES) |
| #elif UPAGES == 2 |
| #define UAREA_SIZE (NBPG*UPAGES) |
| #else |
| FIXME ! !UPAGES is neither 2 nor 16 |
| #endif |
| |
| /* @@@ Should move print_387_status() to i387-tdep.c */ |
| extern void print_387_control_word (); /* i387-tdep.h */ |
| extern void print_387_status_word (); |
| |
| #define private static |
| |
| |
| /* 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. |
| */ |
| |
| 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_ADDRESS(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_ADDRESS (state, regnum), \ |
| count*REGISTER_SIZE) |
| |
| /* Store COUNT contiguous registers to thread STATE starting from REGNUM */ |
| #define STORE_REGS(state, regnum, count) \ |
| memcpy (REG_ADDRESS (state, regnum), \ |
| ®isters[REGISTER_BYTE (regnum)], \ |
| count*REGISTER_SIZE) |
| |
| /* |
| * Fetch inferiors registers for gdb. |
| * REGNO specifies which (as gdb views it) register, -1 for all. |
| */ |
| |
| void |
| fetch_inferior_registers (regno) |
| int regno; |
| { |
| kern_return_t ret; |
| thread_state_data_t state; |
| unsigned int stateCnt = i386_THREAD_STATE_COUNT; |
| int index; |
| |
| if (!MACH_PORT_VALID (current_thread)) |
| error ("fetch inferior registers: Invalid thread"); |
| |
| if (must_suspend_thread) |
| setup_thread (current_thread, 1); |
| |
| ret = thread_get_state (current_thread, |
| i386_THREAD_STATE, |
| state, |
| &stateCnt); |
| |
| if (ret != KERN_SUCCESS) |
| warning ("fetch_inferior_registers: %s ", |
| mach_error_string (ret)); |
| #if 0 |
| /* It may be more effective to store validate all of them, |
| * since we fetched them all anyway |
| */ |
| else if (regno != -1) |
| supply_register (regno, (char *) state + reg_offset[regno]); |
| #endif |
| else |
| { |
| for (index = 0; index < NUM_REGS; index++) |
| supply_register (index, (char *) state + reg_offset[index]); |
| } |
| |
| if (must_suspend_thread) |
| setup_thread (current_thread, 0); |
| } |
| |
| /* Store our register values back into the inferior. |
| * If REGNO is -1, do this for all registers. |
| * Otherwise, REGNO specifies which register |
| * |
| * On mach3 all registers are always saved in one call. |
| */ |
| void |
| store_inferior_registers (regno) |
| int regno; |
| { |
| kern_return_t ret; |
| thread_state_data_t state; |
| unsigned int stateCnt = i386_THREAD_STATE_COUNT; |
| register int index; |
| |
| if (!MACH_PORT_VALID (current_thread)) |
| error ("store inferior registers: Invalid thread"); |
| |
| if (must_suspend_thread) |
| setup_thread (current_thread, 1); |
| |
| /* Fetch the state of the current thread */ |
| ret = thread_get_state (current_thread, |
| i386_THREAD_STATE, |
| state, |
| &stateCnt); |
| |
| if (ret != KERN_SUCCESS) |
| { |
| warning ("store_inferior_registers (get): %s", |
| mach_error_string (ret)); |
| if (must_suspend_thread) |
| setup_thread (current_thread, 0); |
| return; |
| } |
| |
| /* move gdb's registers to thread's state |
| |
| * Since we save all registers anyway, save the ones |
| * that gdb thinks are valid (e.g. ignore the regno |
| * parameter) |
| */ |
| #if 0 |
| if (regno != -1) |
| STORE_REGS (state, regno, 1); |
| else |
| #endif |
| { |
| for (index = 0; index < NUM_REGS; index++) |
| STORE_REGS (state, index, 1); |
| } |
| |
| /* Write gdb's current view of register to the thread |
| */ |
| ret = thread_set_state (current_thread, |
| i386_THREAD_STATE, |
| state, |
| i386_THREAD_STATE_COUNT); |
| |
| if (ret != KERN_SUCCESS) |
| warning ("store_inferior_registers (set): %s", |
| mach_error_string (ret)); |
| |
| if (must_suspend_thread) |
| setup_thread (current_thread, 0); |
| } |
| |
| |
| |
| /* Return the address in the core dump or inferior of register REGNO. |
| * BLOCKEND should be the address of the end of the UPAGES area read |
| * in memory, but it's not? |
| * |
| * Currently our UX server dumps the whole thread state to the |
| * core file. If your UX does something else, adapt the routine |
| * below to return the offset to the given register. |
| * |
| * Called by core-aout.c(fetch_core_registers) |
| */ |
| |
| CORE_ADDR |
| register_addr (regno, blockend) |
| int regno; |
| CORE_ADDR blockend; |
| { |
| CORE_ADDR addr; |
| |
| if (regno < 0 || regno >= NUM_REGS) |
| error ("Invalid register number %d.", regno); |
| |
| /* UAREA_SIZE == 8 kB in i386 */ |
| addr = (unsigned int) REG_ADDRESS (UAREA_SIZE - sizeof (struct i386_thread_state), regno); |
| |
| return addr; |
| } |
| |
| /* 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 |
| */ |
| private |
| print_387_status (status, ep) |
| unsigned short status; |
| struct env387 *ep; |
| { |
| 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)); |
| } |
| |
| /* |
| * 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 |
| { |
| #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. |
| */ |
| private boolean_t |
| get_i387_state (fstate) |
| struct fpstate *fstate; |
| { |
| kern_return_t ret; |
| thread_state_data_t state; |
| unsigned int fsCnt = i386_FLOAT_STATE_COUNT; |
| struct i386_float_state *fsp; |
| |
| ret = thread_get_state (current_thread, |
| i386_FLOAT_STATE, |
| state, |
| &fsCnt); |
| |
| if (ret != KERN_SUCCESS) |
| { |
| warning ("Can not get live floating point state: %s", |
| mach_error_string (ret)); |
| return FALSE; |
| } |
| |
| 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 FALSE; |
| |
| /* 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)); |
| |
| fstate->status = fsp->exc_status; |
| |
| memcpy (fstate->state, (char *) &fsp->hw_state, FP_STATE_BYTES); |
| |
| return TRUE; |
| } |
| |
| private boolean_t |
| get_i387_core_state (fstate) |
| struct fpstate *fstate; |
| { |
| /* Not implemented yet. Core files do not contain float state. */ |
| return FALSE; |
| } |
| |
| /* |
| * This is called by "info float" command |
| */ |
| void |
| i386_mach3_float_info () |
| { |
| char buf[sizeof (struct fpstate) + 2 * sizeof (int)]; |
| boolean_t valid = FALSE; |
| fpstate_t fps; |
| |
| if (target_has_execution) |
| valid = get_i387_state (buf); |
| #if 0 |
| else if (WE HAVE CORE FILE) /* @@@@ Core files not supported */ |
| valid = get_i387_core_state (buf); |
| #endif |
| |
| if (!valid) |
| { |
| warning ("no floating point status saved"); |
| return; |
| } |
| |
| fps = (fpstate_t) buf; |
| |
| print_387_status (fps->status, (struct env387 *) fps->state); |
| } |