161 lines
6.9 KiB
C
161 lines
6.9 KiB
C
/* Target definitions for GNU/Linux on ARM, for GDB.
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Copyright 1999, 2000 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_ARMLINUX_H
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#define TM_ARMLINUX_H
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/* Include the common ARM target definitions. */
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#include "arm/tm-arm.h"
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#include "tm-linux.h"
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/* Target byte order on ARM Linux is little endian and not selectable. */
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#undef TARGET_BYTE_ORDER_SELECTABLE_P
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#define TARGET_BYTE_ORDER_SELECTABLE_P 0
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/* Under ARM Linux the traditional way of performing a breakpoint is to
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execute a particular software interrupt, rather than use a particular
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undefined instruction to provoke a trap. Upon exection of the software
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interrupt the kernel stops the inferior with a SIGTRAP, and wakes the
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debugger. Since ARM Linux is little endian, and doesn't support Thumb
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at the moment we redefined ARM_LE_BREAKPOINT to use the correct software
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interrupt. */
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#undef ARM_LE_BREAKPOINT
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#define ARM_LE_BREAKPOINT {0x01,0x00,0x9f,0xef}
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/* This sequence of words used in the CALL_DUMMY are the following
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instructions:
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mov lr, pc
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mov pc, r4
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swi bkpt_swi
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Note this is 12 bytes. */
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#undef CALL_DUMMY
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#define CALL_DUMMY {0xe1a0e00f, 0xe1a0f004, 0xef9f001}
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/* Extract from an array REGBUF containing the (raw) register state
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a function return value of type TYPE, and copy that, in virtual format,
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into VALBUF. */
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extern void arm_linux_extract_return_value (struct type *, char[], char *);
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#undef EXTRACT_RETURN_VALUE
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#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
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arm_linux_extract_return_value ((TYPE), (REGBUF), (VALBUF))
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/* Things needed for making the inferior call functions.
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FIXME: This and arm_push_arguments should be merged. However this
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function breaks on a little endian host, big endian target
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using the COFF file format. ELF is ok.
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ScottB. */
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#undef PUSH_ARGUMENTS
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#define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
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sp = arm_linux_push_arguments ((nargs), (args), (sp), (struct_return), \
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(struct_addr))
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extern CORE_ADDR arm_linux_push_arguments (int, struct value **, CORE_ADDR,
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int, CORE_ADDR);
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/* The first page is not writeable in ARM Linux. */
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#undef LOWEST_PC
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#define LOWEST_PC 0x8000
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/* Define NO_SINGLE_STEP if ptrace(PT_STEP,...) fails to function correctly
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on ARM Linux. This is the case on 2.0.x kernels, 2.1.x kernels and some
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2.2.x kernels. This will include the implementation of single_step()
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in armlinux-tdep.c. See armlinux-ss.c for more details. */
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/* #define NO_SINGLE_STEP 1 */
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/* Offset to saved PC in sigcontext structure, from <asm/sigcontext.h> */
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#define SIGCONTEXT_PC_OFFSET (sizeof(unsigned long) * 18)
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/* Figure out where the longjmp will land. The code expects that longjmp
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has just been entered and the code had not altered the registers, so
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the arguments are are still in r0-r1. r0 points at the jmp_buf structure
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from which the target pc (JB_PC) is extracted. This pc value is copied
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into ADDR. This routine returns true on success */
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extern int arm_get_longjmp_target (CORE_ADDR *);
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#define GET_LONGJMP_TARGET(addr) arm_get_longjmp_target (addr)
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/* On ARM Linux, each call to a library routine goes through a small piece
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of trampoline code in the ".plt" section. The wait_for_inferior()
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routine uses this macro to detect when we have stepped into one of
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these fragments. We do not use lookup_solib_trampoline_symbol_by_pc,
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because we cannot always find the shared library trampoline symbols. */
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extern int in_plt_section (CORE_ADDR, char *);
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#define IN_SOLIB_CALL_TRAMPOLINE(pc, name) in_plt_section((pc), (name))
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/* On ARM Linux, a call to a library routine does not have to go through
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any trampoline code. */
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#define IN_SOLIB_RETURN_TRAMPOLINE(pc, name) 0
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/* If PC is in a shared library trampoline code, return the PC
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where the function itself actually starts. If not, return 0. */
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extern CORE_ADDR find_solib_trampoline_target (CORE_ADDR pc);
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#define SKIP_TRAMPOLINE_CODE(pc) find_solib_trampoline_target (pc)
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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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extern CORE_ADDR arm_linux_skip_solib_resolver (CORE_ADDR pc);
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#define SKIP_SOLIB_RESOLVER arm_linux_skip_solib_resolver
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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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#if 0
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#undef IN_SOLIB_DYNSYM_RESOLVE_CODE
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extern CORE_ADDR arm_in_solib_dynsym_resolve_code (CORE_ADDR pc, char *name);
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#define IN_SOLIB_DYNSYM_RESOLVE_CODE arm_in_solib_dynsym_resolve_code
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/* ScottB: Current definition is
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extern CORE_ADDR in_svr4_dynsym_resolve_code (CORE_ADDR pc, char *name);
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#define IN_SOLIB_DYNSYM_RESOLVE_CODE in_svr4_dynsym_resolve_code */
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#endif
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/* When the ARM Linux kernel invokes a signal handler, the return
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address points at a special instruction which'll trap back into
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the kernel. These definitions are used to identify this bit of
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code as a signal trampoline in order to support backtracing
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through calls to signal handlers. */
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int arm_linux_in_sigtramp (CORE_ADDR pc, char *name);
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#define IN_SIGTRAMP(pc, name) arm_linux_in_sigtramp (pc, name)
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/* Each OS has different mechanisms for accessing the various
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registers stored in the sigcontext structure. These definitions
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provide a mechanism by which the generic code in arm-tdep.c can
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find the addresses at which various registers are saved at in the
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sigcontext structure. If SIGCONTEXT_REGISTER_ADDRESS is not
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defined, arm-tdep.c will define it to be 0. (See ia64-tdep.c and
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ia64-linux-tdep.c to see what a similar mechanism looks like when
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multi-arched.) */
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extern CORE_ADDR arm_linux_sigcontext_register_address (CORE_ADDR, CORE_ADDR,
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int);
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#define SIGCONTEXT_REGISTER_ADDRESS arm_linux_sigcontext_register_address
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#endif /* TM_ARMLINUX_H */
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