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/* 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"
/* FIXME: kettenis/2000-03-26: We should get rid of this last piece of
Linux-specific `long double'-support code, probably by adding code
to valprint.c:print_floating() to recognize various extended
floating-point formats. */
#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 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)
#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 IN_SIGTRAMP(pc, name) i386_linux_in_sigtramp (pc, name)
extern int i386_linux_in_sigtramp (CORE_ADDR, char *);
/* 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 (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 (struct frame_info *);
#undef SAVED_PC_AFTER_CALL
#define SAVED_PC_AFTER_CALL(frame) i386_linux_saved_pc_after_call (frame)
extern CORE_ADDR i386_linux_saved_pc_after_call (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
/* Support for longjmp. */
/* Details about jmp_buf. It's supposed to be an array of integers. */
#define JB_ELEMENT_SIZE 4 /* Size of elements in jmp_buf. */
#define JB_PC 5 /* Array index of saved PC. */
/* Figure out where the longjmp will land. Slurp the args out of the
stack. We expect the first arg to be a pointer to the jmp_buf
structure from which we extract the pc (JB_PC) that we will land
at. The pc is copied into ADDR. This routine returns true on
success. */
#define GET_LONGJMP_TARGET(addr) get_longjmp_target (addr)
extern int get_longjmp_target (CORE_ADDR *addr);
#endif /* #ifndef TM_LINUX_H */
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