319 lines
10 KiB
C
319 lines
10 KiB
C
/* Definitions to target GDB to GNU/Linux on 386.
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Copyright 1992, 1993 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef TM_LINUX_H
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#define TM_LINUX_H
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#define I386_GNULINUX_TARGET
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#include "i386/tm-i386.h"
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/* Size of sigcontext, from <asm/sigcontext.h>. */
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#define LINUX_SIGCONTEXT_SIZE (88)
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/* Offset to saved PC in sigcontext, from <asm/sigcontext.h>. */
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#define LINUX_SIGCONTEXT_PC_OFFSET (56)
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/* Offset to saved SP in sigcontext, from <asm/sigcontext.h>. */
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#define LINUX_SIGCONTEXT_SP_OFFSET (28)
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/* We need this file for the SOLIB_TRAMPOLINE stuff. */
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#include "tm-sysv4.h"
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/* copy of tm-cygwin32.h */
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#undef REGISTER_RAW_SIZE
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#undef REGISTER_VIRTUAL_SIZE
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#undef REGISTER_VIRTUAL_TYPE
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#undef REGISTER_NAMES
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#undef REGISTER_BYTES
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#undef REGISTER_BYTE
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#undef MAX_REGISTER_VIRTUAL_SIZE
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#undef NUM_REGS
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#undef NUM_FREGS
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/* Number of machine registers */
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#define NUM_REGS 31
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#define NUM_FREGS 15
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/* Initializer for an array of names of registers.
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There should be NUM_REGS strings in this initializer. */
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/* the order of the first 8 registers must match the compiler's
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* numbering scheme (which is the same as the 386 scheme)
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* also, this table must match regmap in i386-pinsn.c.
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*/
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#define REGISTER_NAMES { "eax", "ecx", "edx", "ebx", \
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"esp", "ebp", "esi", "edi", \
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"eip", "eflags","cs", "ss", \
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"ds", "es", "fs", "gs", \
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"cwd", "swd", "twd", "fip", \
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"fcs", "fopo", "fos", \
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"st", "st1", "st2", "st3", \
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"st4", "st5", "st6", "st7",}
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#define LOW_RETURN_REGNUM 0 /* holds low four bytes of result */
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#define HIGH_RETURN_REGNUM 2 /* holds high four bytes of result */
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#define FPSTART_REGNUM 16 /* start of FPU registers */
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#define FPCONTROL_REGNUM 16 /* FPU control register */
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#define FPSTATUS_REGNUM 17 /* FPU status register */
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#define FPTAG_REGNUM 18 /* FPU tag register */
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#define FPDATA_REGNUM 23 /* actual floating-point values */
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#define FPEND_REGNUM (FPSTART_REGNUM + 14) /* last FPU register */
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#define FPENV_BYTES (7 * 4)
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#define FPREG_RAW_SIZE (10)
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/* Total amount of space needed to store our copies of the machine's
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FPU state. */
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#define FPREG_BYTES (FPENV_BYTES + 8 * FPREG_RAW_SIZE)
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/* Total amount of space needed to store our copies of the machine's
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register state, the array `registers'. */
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#define REGISTER_BYTES (FPSTART_REGNUM * 4 + FPREG_BYTES)
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/* Index within `registers' of the first byte of the space for
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register N. */
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#define REGISTER_BYTE(N) (((N) < FPDATA_REGNUM) ? \
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(N) * 4 : \
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(((N) - FPDATA_REGNUM) * FPREG_RAW_SIZE) \
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+ (FPDATA_REGNUM * 4))
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/* Number of bytes of storage in the actual machine representation
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for register N. */
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#define REGISTER_RAW_SIZE(N) (((N) < FPDATA_REGNUM) ? 4 : FPREG_RAW_SIZE)
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/* Number of bytes of storage in the program's representation
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for register N. */
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#define REGISTER_VIRTUAL_SIZE(N) (((N) < FPDATA_REGNUM) ? 4 : FPREG_RAW_SIZE)
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/* Largest value REGISTER_RAW_SIZE can have. */
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#undef MAX_REGISTER_RAW_SIZE
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#define MAX_REGISTER_RAW_SIZE FPREG_RAW_SIZE
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/* Largest value REGISTER_VIRTUAL_SIZE can have. */
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#define MAX_REGISTER_VIRTUAL_SIZE FPREG_RAW_SIZE
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#if defined(HAVE_LONG_DOUBLE) && defined(HOST_I386)
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/* The host and target are i386 machines and the compiler supports
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long doubles. Long doubles on the host therefore have the same
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layout as a 387 FPU stack register. */
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#define LD_I387
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#endif
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#define TARGET_LONG_DOUBLE_BIT 80
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#ifdef LD_I387
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extern int i387_extract_floating (PTR addr, int len, long double *dretptr);
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extern int i387_store_floating (PTR addr, int len, long double val);
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#define TARGET_EXTRACT_FLOATING i387_extract_floating
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#define TARGET_STORE_FLOATING i387_store_floating
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#define TARGET_ANALYZE_FLOATING \
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do \
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{ \
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unsigned expon; \
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\
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low = extract_unsigned_integer (valaddr, 4); \
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high = extract_unsigned_integer (valaddr + 4, 4); \
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expon = extract_unsigned_integer (valaddr + 8, 2); \
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\
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nonnegative = ((expon & 0x8000) == 0); \
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is_nan = ((expon & 0x7fff) == 0x7fff) \
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&& ((high & 0x80000000) == 0x80000000) \
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&& (((high & 0x7fffffff) | low) != 0); \
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} \
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while (0)
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#endif
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#ifndef LD_I387
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/* Nonzero if register N requires conversion
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from raw format to virtual format. */
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#define REGISTER_CONVERTIBLE(N) \
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((N < FPDATA_REGNUM) ? 0 : 1)
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#endif
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#ifdef LD_I387
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#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \
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{ \
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long double val = *((long double *)FROM); \
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store_floating ((TO), TYPE_LENGTH (TYPE), val); \
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}
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#else
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/* Convert data from raw format for register REGNUM in buffer FROM
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to virtual format with type TYPE in buffer TO. */
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extern void
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i387_to_double PARAMS ((char *, char *));
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#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \
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{ \
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double val; \
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i387_to_double ((FROM), (char *)&val); \
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store_floating ((TO), TYPE_LENGTH (TYPE), val); \
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}
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#endif
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#ifdef LD_I387
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#define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO) \
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{ \
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long double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \
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*((long double *)TO) = val; \
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}
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#else
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extern void
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double_to_i387 PARAMS ((char *, char *));
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#define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO) \
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{ \
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double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \
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double_to_i387((char *)&val, (TO)); \
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}
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#endif
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/* Return the GDB type object for the "standard" data type
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of data in register N. */
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#ifdef LD_I387
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#define REGISTER_VIRTUAL_TYPE(N) \
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((N < FPDATA_REGNUM) ? builtin_type_int : \
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builtin_type_long_double)
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#else
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#define REGISTER_VIRTUAL_TYPE(N) \
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((N < FPDATA_REGNUM) ? builtin_type_int : \
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builtin_type_double)
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#endif
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/* end of copy */
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extern void i387_float_info(void);
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#define FLOAT_INFO { i387_float_info (); }
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/* The following works around a problem with /usr/include/sys/procfs.h */
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#define sys_quotactl 1
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/* Define DO_REGISTERS_INFO() to do machine-specific formatting
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of register dumps. */
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#define DO_REGISTERS_INFO(_regnum, fp) i386_do_registers_info(_regnum, fp)
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extern void i386_do_registers_info PARAMS ((int, int));
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extern void i387_print_register PARAMS ((char *, int));
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/* When the i386 Linux kernel calls a signal handler, the return
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address points to a bit of code on the stack. These definitions
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are used to identify this bit of code as a signal trampoline in
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order to support backtracing through calls to signal handlers. */
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#define I386_LINUX_SIGTRAMP
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#define IN_SIGTRAMP(pc, name) ((name) == NULL && i386_linux_sigtramp (pc))
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extern int i386_linux_sigtramp PARAMS ((CORE_ADDR));
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/* We need our own version of sigtramp_saved_pc to get the saved PC in
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a sigtramp routine. */
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#define sigtramp_saved_pc i386_linux_sigtramp_saved_pc
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extern CORE_ADDR i386_linux_sigtramp_saved_pc PARAMS ((struct frame_info *));
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/* Signal trampolines don't have a meaningful frame. As in tm-i386.h,
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the frame pointer value we use is actually the frame pointer of the
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calling frame--that is, the frame which was in progress when the
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signal trampoline was entered. gdb mostly treats this frame
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pointer value as a magic cookie. We detect the case of a signal
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trampoline by looking at the SIGNAL_HANDLER_CALLER field, which is
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set based on IN_SIGTRAMP.
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When a signal trampoline is invoked from a frameless function, we
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essentially have two frameless functions in a row. In this case,
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we use the same magic cookie for three frames in a row. We detect
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this case by seeing whether the next frame has
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SIGNAL_HANDLER_CALLER set, and, if it does, checking whether the
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current frame is actually frameless. In this case, we need to get
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the PC by looking at the SP register value stored in the signal
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context.
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This should work in most cases except in horrible situations where
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a signal occurs just as we enter a function but before the frame
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has been set up. */
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#define FRAMELESS_SIGNAL(FRAME) \
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((FRAME)->next != NULL \
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&& (FRAME)->next->signal_handler_caller \
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&& frameless_look_for_prologue (FRAME))
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#undef FRAME_CHAIN
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#define FRAME_CHAIN(FRAME) \
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((FRAME)->signal_handler_caller \
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? (FRAME)->frame \
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: (FRAMELESS_SIGNAL (FRAME) \
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? (FRAME)->frame \
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: (!inside_entry_file ((FRAME)->pc) \
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? read_memory_integer ((FRAME)->frame, 4) \
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: 0)))
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#undef FRAME_SAVED_PC
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#define FRAME_SAVED_PC(FRAME) \
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((FRAME)->signal_handler_caller \
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? sigtramp_saved_pc (FRAME) \
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: (FRAMELESS_SIGNAL (FRAME) \
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? read_memory_integer (i386_linux_sigtramp_saved_sp ((FRAME)->next), 4) \
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: read_memory_integer ((FRAME)->frame + 4, 4)))
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extern CORE_ADDR i386_linux_sigtramp_saved_sp PARAMS ((struct frame_info *));
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/* Some versions of Linux have real-time signal support in the C library, and
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some don't. We have to include this file to find out. */
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#include <signal.h>
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#ifdef __SIGRTMIN
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#define REALTIME_LO __SIGRTMIN
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#define REALTIME_HI (__SIGRTMAX + 1)
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#else
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#define REALTIME_LO 32
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#define REALTIME_HI 64
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#endif
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/* When we call a function in a shared library, and the PLT sends us
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into the dynamic linker to find the function's real address, we
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need to skip over the dynamic linker call. This function decides
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when to skip, and where to skip to. See the comments for
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SKIP_SOLIB_RESOLVER at the top of infrun.c. */
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#define SKIP_SOLIB_RESOLVER i386_linux_skip_solib_resolver
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extern CORE_ADDR i386_linux_skip_solib_resolver (CORE_ADDR pc);
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/* N_FUN symbols in shared libaries have 0 for their values and need
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to be relocated. */
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#define SOFUN_ADDRESS_MAYBE_MISSING
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#endif /* #ifndef TM_LINUX_H */
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