f19ebbbc84
(JB_ELEMENT_SIZE, JB_PC): New defines. (GET_LONGJMP_TARGET): Define. (get_longjmp_target): Add prototype.
157 lines
5.9 KiB
C
157 lines
5.9 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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/* FIXME: kettenis/2000-03-26: We should get rid of this last piece of
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Linux-specific `long double'-support code, probably by adding code
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to valprint.c:print_floating() to recognize various extended
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floating-point formats. */
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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 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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/* 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 IN_SIGTRAMP(pc, name) i386_linux_in_sigtramp (pc, name)
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extern int i386_linux_in_sigtramp (CORE_ADDR, char *);
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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 (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 (struct frame_info *);
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#undef SAVED_PC_AFTER_CALL
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#define SAVED_PC_AFTER_CALL(frame) i386_linux_saved_pc_after_call (frame)
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extern CORE_ADDR i386_linux_saved_pc_after_call (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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/* Support for longjmp. */
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/* Details about jmp_buf. It's supposed to be an array of integers. */
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#define JB_ELEMENT_SIZE 4 /* Size of elements in jmp_buf. */
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#define JB_PC 5 /* Array index of saved PC. */
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/* Figure out where the longjmp will land. Slurp the args out of the
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stack. We expect the first arg to be a pointer to the jmp_buf
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structure from which we extract the pc (JB_PC) that we will land
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at. The pc is copied into ADDR. This routine returns true on
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success. */
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#define GET_LONGJMP_TARGET(addr) get_longjmp_target (addr)
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extern int get_longjmp_target (CORE_ADDR *addr);
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#endif /* #ifndef TM_LINUX_H */
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