179 lines
6.5 KiB
C
179 lines
6.5 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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#define HAVE_I387_REGS
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#ifdef HAVE_PTRACE_GETXFPREGS
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#define HAVE_SSE_REGS
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#endif
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#include "i386/tm-i386.h"
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#include "tm-linux.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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#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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/* This should probably move to tm-i386.h. */
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#define TARGET_LONG_DOUBLE_BIT 80
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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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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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#undef REGISTER_CONVERT_TO_VIRTUAL
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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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#undef REGISTER_CONVERT_TO_RAW
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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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/* Return the GDB type object for the "standard" data type
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of data in register N. */
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#undef REGISTER_VIRTUAL_TYPE
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#define REGISTER_VIRTUAL_TYPE(N) \
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(((N) == PC_REGNUM || (N) == FP_REGNUM || (N) == SP_REGNUM) \
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? lookup_pointer_type (builtin_type_void) \
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: IS_FP_REGNUM(N) ? builtin_type_long_double \
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: IS_SSE_REGNUM(N) ? builtin_type_v4sf \
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: builtin_type_int)
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#endif
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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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/* 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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/* 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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