gdb/config/arm/tm-linux.h

   1 /* Target definitions for GNU/Linux on ARM, for GDB.
   2    Copyright 1999 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #ifndef TM_ARMLINUX_H
  22 #define TM_ARMLINUX_H
  23
  24 /* Include the common ARM target definitions.  */
  25 #include "arm/tm-arm.h"
  26
  27 #include "tm-linux.h"
  28
  29 /* Target byte order on ARM Linux is not selectable.  */
  30 #undef TARGET_BYTE_ORDER_SELECTABLE_P
  31 #define TARGET_BYTE_ORDER_SELECTABLE_P          0
  32
  33 /* Under ARM Linux the traditional way of performing a breakpoint is to
  34    execute a particular software interrupt, rather than use a particular
  35    undefined instruction to provoke a trap.  Upon exection of the software
  36    interrupt the kernel stops the inferior with a SIGTRAP, and wakes the
  37    debugger.  Since ARM Linux is little endian, and doesn't support Thumb
  38    at the moment we redefined ARM_LE_BREAKPOINT to use the correct software
  39    interrupt.  */
  40 #undef ARM_LE_BREAKPOINT
  41 #define ARM_LE_BREAKPOINT       {0x01,0x00,0x9f,0xef}
  42
  43 /* This sequence of words used in the CALL_DUMMY are the following
  44    instructions:
  45
  46    mov  lr, pc
  47    mov  pc, r4
  48    swi  bkpt_swi
  49
  50    Note this is 12 bytes.  */
  51
  52 #undef CALL_DUMMY
  53 #define CALL_DUMMY {0xe1a0e00f, 0xe1a0f004, 0xef9f001}
  54
  55 /* Extract from an array REGBUF containing the (raw) register state
  56    a function return value of type TYPE, and copy that, in virtual format,
  57    into VALBUF.  */
  58 extern void arm_linux_extract_return_value (struct type *, char[], char *);
  59 #undef EXTRACT_RETURN_VALUE
  60 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
  61         arm_linux_extract_return_value ((TYPE), (REGBUF), (VALBUF))
  62
  63 /* The first page is not writeable in ARM Linux.  */
  64 #define LOWEST_PC       0x8000
  65
  66 /* Define NO_SINGLE_STEP if ptrace(PT_STEP,...) fails to function correctly
  67    on ARM Linux.  This is the case on 2.0.x kernels, 2.1.x kernels and some
  68    2.2.x kernels.  This will include the implementation of single_step()
  69    in armlinux-tdep.c.  See armlinux-ss.c for more details. */
  70 /* #define NO_SINGLE_STEP       1 */
  71
  72 /* Offset to saved PC in sigcontext structure, from <asm/sigcontext.h> */
  73 #define SIGCONTEXT_PC_OFFSET    (sizeof(unsigned long) * 18)
  74
  75 /* Figure out where the longjmp will land.  The code expects that longjmp
  76    has just been entered and the code had not altered the registers, so
  77    the arguments are are still in r0-r1.  r0 points at the jmp_buf structure
  78    from which the target pc (JB_PC) is extracted.  This pc value is copied
  79    into ADDR.  This routine returns true on success */
  80 extern int arm_get_longjmp_target (CORE_ADDR *);
  81 #define GET_LONGJMP_TARGET(addr)        arm_get_longjmp_target (addr)
  82
  83 /* On ARM Linux, each call to a library routine goes through a small piece
  84    of trampoline code in the ".plt" section.  The  wait_for_inferior()
  85    routine uses this macro to detect when we have stepped into one of
  86    these fragments.  We do not use lookup_solib_trampoline_symbol_by_pc,
  87    because we cannot always find the shared library trampoline symbols.  */
  88 extern int in_plt_section (CORE_ADDR, char *);
  89 #define IN_SOLIB_CALL_TRAMPOLINE(pc, name) in_plt_section((pc), (name))
  90
  91 /* On ARM Linux, a call to a library routine does not have to go through
  92    any trampoline code.  */
  93 #define IN_SOLIB_RETURN_TRAMPOLINE(pc, name)    0
  94
  95 /* If PC is in a shared library trampoline code, return the PC
  96    where the function itself actually starts.  If not, return 0.  */
  97 extern CORE_ADDR find_solib_trampoline_target (CORE_ADDR pc);
  98 #define SKIP_TRAMPOLINE_CODE(pc)  find_solib_trampoline_target (pc)
  99
 100 /* When we call a function in a shared library, and the PLT sends us
 101    into the dynamic linker to find the function's real address, we
 102    need to skip over the dynamic linker call.  This function decides
 103    when to skip, and where to skip to.  See the comments for
 104    SKIP_SOLIB_RESOLVER at the top of infrun.c.  */
 105 extern CORE_ADDR arm_skip_solib_resolver (CORE_ADDR pc);
 106 #define SKIP_SOLIB_RESOLVER arm_skip_solib_resolver
 107
 108 /* When we call a function in a shared library, and the PLT sends us
 109    into the dynamic linker to find the function's real address, we
 110    need to skip over the dynamic linker call.  This function decides
 111    when to skip, and where to skip to.  See the comments for
 112    SKIP_SOLIB_RESOLVER at the top of infrun.c.  */
 113 #if 0
 114 #undef IN_SOLIB_DYNSYM_RESOLVE_CODE
 115 extern CORE_ADDR arm_in_solib_dynsym_resolve_code (CORE_ADDR pc, char *name);
 116 #define IN_SOLIB_DYNSYM_RESOLVE_CODE  arm_in_solib_dynsym_resolve_code
 117 /* ScottB: Current definition is
 118 extern CORE_ADDR in_svr4_dynsym_resolve_code (CORE_ADDR pc, char *name);
 119 #define IN_SOLIB_DYNSYM_RESOLVE_CODE  in_svr4_dynsym_resolve_code */
 120 #endif
 121
 122 #endif /* TM_ARMLINUX_H */