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