gdb/config/i386/tm-linux.h - third_party/binutils-gdb - Git at Google

 /* Definitions to target GDB to GNU/Linux on 386.
    Copyright 1992, 1993 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.  */

 #ifndef TM_LINUX_H
 #define TM_LINUX_H

 #define I386_GNULINUX_TARGET
 #define HAVE_I387_REGS
 #ifdef HAVE_PTRACE_GETXFPREGS
 #define HAVE_SSE_REGS
 #endif

 #include "i386/tm-i386.h"
 #include "tm-linux.h"

 /* Size of sigcontext, from <asm/sigcontext.h>.  */
 #define LINUX_SIGCONTEXT_SIZE (88)

 /* Offset to saved PC in sigcontext, from <asm/sigcontext.h>.  */
 #define LINUX_SIGCONTEXT_PC_OFFSET (56)

 /* Offset to saved SP in sigcontext, from <asm/sigcontext.h>.  */
 #define LINUX_SIGCONTEXT_SP_OFFSET (28)

 #define LOW_RETURN_REGNUM 0	/* holds low four bytes of result */
 #define HIGH_RETURN_REGNUM 2	/* holds high four bytes of result */

 /* This should probably move to tm-i386.h.  */
 #define TARGET_LONG_DOUBLE_BIT 80

 #if defined(HAVE_LONG_DOUBLE) && defined(HOST_I386)
 /* The host and target are i386 machines and the compiler supports
    long doubles. Long doubles on the host therefore have the same
    layout as a 387 FPU stack register. */
 #define LD_I387

 extern int i387_extract_floating (PTR addr, int len, long double *dretptr);
 extern int i387_store_floating   (PTR addr, int len, long double val);

 #define TARGET_EXTRACT_FLOATING i387_extract_floating
 #define TARGET_STORE_FLOATING   i387_store_floating

 #define TARGET_ANALYZE_FLOATING					\
   do								\
     {								\
       unsigned expon;						\
 								\
       low = extract_unsigned_integer (valaddr, 4);		\
       high = extract_unsigned_integer (valaddr + 4, 4);		\
       expon = extract_unsigned_integer (valaddr + 8, 2);	\
 								\
       nonnegative = ((expon & 0x8000) == 0);			\
       is_nan = ((expon & 0x7fff) == 0x7fff)			\
 	&& ((high & 0x80000000) == 0x80000000)			\
 	&& (((high & 0x7fffffff) | low) != 0);			\
     }								\
   while (0)

 #undef REGISTER_CONVERT_TO_VIRTUAL
 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO)	\
 {								\
   long double val = *((long double *)FROM);			\
   store_floating ((TO), TYPE_LENGTH (TYPE), val);		\
 }

 #undef REGISTER_CONVERT_TO_RAW
 #define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO)			\
 {									\
   long double val = extract_floating ((FROM), TYPE_LENGTH (TYPE));	\
   *((long double *)TO) = val;						\
 }

 /* Return the GDB type object for the "standard" data type
    of data in register N.  */
 #undef REGISTER_VIRTUAL_TYPE
 #define REGISTER_VIRTUAL_TYPE(N)				\
   (((N) == PC_REGNUM || (N) == FP_REGNUM || (N) == SP_REGNUM)	\
    ? lookup_pointer_type (builtin_type_void)			\
    : IS_FP_REGNUM(N) ? builtin_type_long_double			\
    : IS_SSE_REGNUM(N) ? builtin_type_v4sf			\
    : builtin_type_int)

 #endif

 /* The following works around a problem with /usr/include/sys/procfs.h  */
 #define sys_quotactl 1

 /* When the i386 Linux kernel calls a signal handler, the return
    address points to a bit of code on the stack.  These definitions
    are used to identify this bit of code as a signal trampoline in
    order to support backtracing through calls to signal handlers.  */

 #define I386_LINUX_SIGTRAMP
 #define IN_SIGTRAMP(pc, name) ((name) == NULL && i386_linux_sigtramp (pc))

 extern int i386_linux_sigtramp PARAMS ((CORE_ADDR));

 /* We need our own version of sigtramp_saved_pc to get the saved PC in
    a sigtramp routine.  */

 #define sigtramp_saved_pc i386_linux_sigtramp_saved_pc
 extern CORE_ADDR i386_linux_sigtramp_saved_pc PARAMS ((struct frame_info *));

 /* Signal trampolines don't have a meaningful frame.  As in tm-i386.h,
    the frame pointer value we use is actually the frame pointer of the
    calling frame--that is, the frame which was in progress when the
    signal trampoline was entered.  gdb mostly treats this frame
    pointer value as a magic cookie.  We detect the case of a signal
    trampoline by looking at the SIGNAL_HANDLER_CALLER field, which is
    set based on IN_SIGTRAMP.

    When a signal trampoline is invoked from a frameless function, we
    essentially have two frameless functions in a row.  In this case,
    we use the same magic cookie for three frames in a row.  We detect
    this case by seeing whether the next frame has
    SIGNAL_HANDLER_CALLER set, and, if it does, checking whether the
    current frame is actually frameless.  In this case, we need to get
    the PC by looking at the SP register value stored in the signal
    context.

    This should work in most cases except in horrible situations where
    a signal occurs just as we enter a function but before the frame
    has been set up.  */

 #define FRAMELESS_SIGNAL(FRAME)					\
   ((FRAME)->next != NULL					\
    && (FRAME)->next->signal_handler_caller			\
    && frameless_look_for_prologue (FRAME))

 #undef FRAME_CHAIN
 #define FRAME_CHAIN(FRAME)					\
   ((FRAME)->signal_handler_caller				\
    ? (FRAME)->frame						\
     : (FRAMELESS_SIGNAL (FRAME)					\
        ? (FRAME)->frame						\
        : (!inside_entry_file ((FRAME)->pc)			\
 	  ? read_memory_integer ((FRAME)->frame, 4)		\
 	  : 0)))

 #undef FRAME_SAVED_PC
 #define FRAME_SAVED_PC(FRAME)					\
   ((FRAME)->signal_handler_caller				\
    ? sigtramp_saved_pc (FRAME)					\
    : (FRAMELESS_SIGNAL (FRAME)					\
       ? read_memory_integer (i386_linux_sigtramp_saved_sp ((FRAME)->next), 4) \
       : read_memory_integer ((FRAME)->frame + 4, 4)))

 extern CORE_ADDR i386_linux_sigtramp_saved_sp PARAMS ((struct frame_info *));

 /* When we call a function in a shared library, and the PLT sends us
    into the dynamic linker to find the function's real address, we
    need to skip over the dynamic linker call.  This function decides
    when to skip, and where to skip to.  See the comments for
    SKIP_SOLIB_RESOLVER at the top of infrun.c.  */
 #define SKIP_SOLIB_RESOLVER i386_linux_skip_solib_resolver
 extern CORE_ADDR i386_linux_skip_solib_resolver (CORE_ADDR pc);

 /* N_FUN symbols in shared libaries have 0 for their values and need
    to be relocated. */
 #define SOFUN_ADDRESS_MAYBE_MISSING

 #endif /* #ifndef TM_LINUX_H */
	/* Definitions to target GDB to GNU/Linux on 386.
	Copyright 1992, 1993 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. */

	#ifndef TM_LINUX_H
	#define TM_LINUX_H

	#define I386_GNULINUX_TARGET
	#define HAVE_I387_REGS
	#ifdef HAVE_PTRACE_GETXFPREGS
	#define HAVE_SSE_REGS
	#endif

	#include "i386/tm-i386.h"
	#include "tm-linux.h"

	/* Size of sigcontext, from <asm/sigcontext.h>. */
	#define LINUX_SIGCONTEXT_SIZE (88)

	/* Offset to saved PC in sigcontext, from <asm/sigcontext.h>. */
	#define LINUX_SIGCONTEXT_PC_OFFSET (56)

	/* Offset to saved SP in sigcontext, from <asm/sigcontext.h>. */
	#define LINUX_SIGCONTEXT_SP_OFFSET (28)

	#define LOW_RETURN_REGNUM 0 /* holds low four bytes of result */
	#define HIGH_RETURN_REGNUM 2 /* holds high four bytes of result */

	/* This should probably move to tm-i386.h. */
	#define TARGET_LONG_DOUBLE_BIT 80

	#if defined(HAVE_LONG_DOUBLE) && defined(HOST_I386)
	/* The host and target are i386 machines and the compiler supports
	long doubles. Long doubles on the host therefore have the same
	layout as a 387 FPU stack register. */
	#define LD_I387

	extern int i387_extract_floating (PTR addr, int len, long double *dretptr);
	extern int i387_store_floating (PTR addr, int len, long double val);

	#define TARGET_EXTRACT_FLOATING i387_extract_floating
	#define TARGET_STORE_FLOATING i387_store_floating

	#define TARGET_ANALYZE_FLOATING \
	do \
	{ \
	unsigned expon; \
	\
	low = extract_unsigned_integer (valaddr, 4); \
	high = extract_unsigned_integer (valaddr + 4, 4); \
	expon = extract_unsigned_integer (valaddr + 8, 2); \
	\
	nonnegative = ((expon & 0x8000) == 0); \
	is_nan = ((expon & 0x7fff) == 0x7fff) \
	&& ((high & 0x80000000) == 0x80000000) \
	&& (((high & 0x7fffffff) \| low) != 0); \
	} \
	while (0)

	#undef REGISTER_CONVERT_TO_VIRTUAL
	#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \
	{ \
	long double val = ((long double )FROM); \
	store_floating ((TO), TYPE_LENGTH (TYPE), val); \
	}

	#undef REGISTER_CONVERT_TO_RAW
	#define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO) \
	{ \
	long double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \
	((long double )TO) = val; \
	}

	/* Return the GDB type object for the "standard" data type
	of data in register N. */
	#undef REGISTER_VIRTUAL_TYPE
	#define REGISTER_VIRTUAL_TYPE(N) \
	(((N) == PC_REGNUM \|\| (N) == FP_REGNUM \|\| (N) == SP_REGNUM) \
	? lookup_pointer_type (builtin_type_void) \
	: IS_FP_REGNUM(N) ? builtin_type_long_double \
	: IS_SSE_REGNUM(N) ? builtin_type_v4sf \
	: builtin_type_int)

	#endif

	/* The following works around a problem with /usr/include/sys/procfs.h */
	#define sys_quotactl 1

	/* When the i386 Linux kernel calls a signal handler, the return
	address points to a bit of code on the stack. These definitions
	are used to identify this bit of code as a signal trampoline in
	order to support backtracing through calls to signal handlers. */

	#define I386_LINUX_SIGTRAMP
	#define IN_SIGTRAMP(pc, name) ((name) == NULL && i386_linux_sigtramp (pc))

	extern int i386_linux_sigtramp PARAMS ((CORE_ADDR));

	/* We need our own version of sigtramp_saved_pc to get the saved PC in
	a sigtramp routine. */

	#define sigtramp_saved_pc i386_linux_sigtramp_saved_pc
	extern CORE_ADDR i386_linux_sigtramp_saved_pc PARAMS ((struct frame_info *));

	/* Signal trampolines don't have a meaningful frame. As in tm-i386.h,
	the frame pointer value we use is actually the frame pointer of the
	calling frame--that is, the frame which was in progress when the
	signal trampoline was entered. gdb mostly treats this frame
	pointer value as a magic cookie. We detect the case of a signal
	trampoline by looking at the SIGNAL_HANDLER_CALLER field, which is
	set based on IN_SIGTRAMP.

	When a signal trampoline is invoked from a frameless function, we
	essentially have two frameless functions in a row. In this case,
	we use the same magic cookie for three frames in a row. We detect
	this case by seeing whether the next frame has
	SIGNAL_HANDLER_CALLER set, and, if it does, checking whether the
	current frame is actually frameless. In this case, we need to get
	the PC by looking at the SP register value stored in the signal
	context.

	This should work in most cases except in horrible situations where
	a signal occurs just as we enter a function but before the frame
	has been set up. */

	#define FRAMELESS_SIGNAL(FRAME) \
	((FRAME)->next != NULL \
	&& (FRAME)->next->signal_handler_caller \
	&& frameless_look_for_prologue (FRAME))

	#undef FRAME_CHAIN
	#define FRAME_CHAIN(FRAME) \
	((FRAME)->signal_handler_caller \
	? (FRAME)->frame \
	: (FRAMELESS_SIGNAL (FRAME) \
	? (FRAME)->frame \
	: (!inside_entry_file ((FRAME)->pc) \
	? read_memory_integer ((FRAME)->frame, 4) \
	: 0)))

	#undef FRAME_SAVED_PC
	#define FRAME_SAVED_PC(FRAME) \
	((FRAME)->signal_handler_caller \
	? sigtramp_saved_pc (FRAME) \
	: (FRAMELESS_SIGNAL (FRAME) \
	? read_memory_integer (i386_linux_sigtramp_saved_sp ((FRAME)->next), 4) \
	: read_memory_integer ((FRAME)->frame + 4, 4)))

	extern CORE_ADDR i386_linux_sigtramp_saved_sp PARAMS ((struct frame_info *));

	/* When we call a function in a shared library, and the PLT sends us
	into the dynamic linker to find the function's real address, we
	need to skip over the dynamic linker call. This function decides
	when to skip, and where to skip to. See the comments for
	SKIP_SOLIB_RESOLVER at the top of infrun.c. */
	#define SKIP_SOLIB_RESOLVER i386_linux_skip_solib_resolver
	extern CORE_ADDR i386_linux_skip_solib_resolver (CORE_ADDR pc);

	/* N_FUN symbols in shared libaries have 0 for their values and need
	to be relocated. */
	#define SOFUN_ADDRESS_MAYBE_MISSING

	#endif /* #ifndef TM_LINUX_H */