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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [gdbserver/] [linux-arm-low.c] - Rev 198
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/* GNU/Linux/ARM specific low level interface, for the remote server for GDB. Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 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 3 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, see <http://www.gnu.org/licenses/>. */ #include "server.h" #include "linux-low.h" #include <sys/ptrace.h> #include "gdb_proc_service.h" #ifndef PTRACE_GET_THREAD_AREA #define PTRACE_GET_THREAD_AREA 22 #endif #ifndef PTRACE_GETWMMXREGS # define PTRACE_GETWMMXREGS 18 # define PTRACE_SETWMMXREGS 19 #endif #ifdef HAVE_SYS_REG_H #include <sys/reg.h> #endif #define arm_num_regs 26 static int arm_regmap[] = { 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, -1, -1, -1, -1, -1, -1, -1, -1, -1, 64 }; static int arm_cannot_store_register (int regno) { return (regno >= arm_num_regs); } static int arm_cannot_fetch_register (int regno) { return (regno >= arm_num_regs); } static void arm_fill_gregset (void *buf) { int i; for (i = 0; i < arm_num_regs; i++) if (arm_regmap[i] != -1) collect_register (i, ((char *) buf) + arm_regmap[i]); } static void arm_store_gregset (const void *buf) { int i; char zerobuf[8]; memset (zerobuf, 0, 8); for (i = 0; i < arm_num_regs; i++) if (arm_regmap[i] != -1) supply_register (i, ((char *) buf) + arm_regmap[i]); else supply_register (i, zerobuf); } #ifdef __IWMMXT__ static void arm_fill_wmmxregset (void *buf) { int i; for (i = 0; i < 16; i++) collect_register (arm_num_regs + i, (char *) buf + i * 8); /* We only have access to wcssf, wcasf, and wcgr0-wcgr3. */ for (i = 0; i < 6; i++) collect_register (arm_num_regs + i + 16, (char *) buf + 16 * 8 + i * 4); } static void arm_store_wmmxregset (const void *buf) { int i; for (i = 0; i < 16; i++) supply_register (arm_num_regs + i, (char *) buf + i * 8); /* We only have access to wcssf, wcasf, and wcgr0-wcgr3. */ for (i = 0; i < 6; i++) supply_register (arm_num_regs + i + 16, (char *) buf + 16 * 8 + i * 4); } #endif /* __IWMMXT__ */ extern int debug_threads; static CORE_ADDR arm_get_pc () { unsigned long pc; collect_register_by_name ("pc", &pc); if (debug_threads) fprintf (stderr, "stop pc is %08lx\n", pc); return pc; } static void arm_set_pc (CORE_ADDR pc) { unsigned long newpc = pc; supply_register_by_name ("pc", &newpc); } /* Correct in either endianness. We do not support Thumb yet. */ static const unsigned long arm_breakpoint = 0xef9f0001; #define arm_breakpoint_len 4 /* For new EABI binaries. We recognize it regardless of which ABI is used for gdbserver, so single threaded debugging should work OK, but for multi-threaded debugging we only insert the current ABI's breakpoint instruction. For now at least. */ static const unsigned long arm_eabi_breakpoint = 0xe7f001f0; static int arm_breakpoint_at (CORE_ADDR where) { unsigned long insn; (*the_target->read_memory) (where, (unsigned char *) &insn, 4); if (insn == arm_breakpoint) return 1; if (insn == arm_eabi_breakpoint) return 1; /* If necessary, recognize more trap instructions here. GDB only uses the two. */ return 0; } /* We only place breakpoints in empty marker functions, and thread locking is outside of the function. So rather than importing software single-step, we can just run until exit. */ static CORE_ADDR arm_reinsert_addr () { unsigned long pc; collect_register_by_name ("lr", &pc); return pc; } /* Fetch the thread-local storage pointer for libthread_db. */ ps_err_e ps_get_thread_area (const struct ps_prochandle *ph, lwpid_t lwpid, int idx, void **base) { if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) return PS_ERR; /* IDX is the bias from the thread pointer to the beginning of the thread descriptor. It has to be subtracted due to implementation quirks in libthread_db. */ *base = (void *) ((char *)*base - idx); return PS_OK; } struct regset_info target_regsets[] = { { PTRACE_GETREGS, PTRACE_SETREGS, 18 * 4, GENERAL_REGS, arm_fill_gregset, arm_store_gregset }, #ifdef __IWMMXT__ { PTRACE_GETWMMXREGS, PTRACE_SETWMMXREGS, 16 * 8 + 6 * 4, EXTENDED_REGS, arm_fill_wmmxregset, arm_store_wmmxregset }, #endif { 0, 0, -1, -1, NULL, NULL } }; struct linux_target_ops the_low_target = { arm_num_regs, arm_regmap, arm_cannot_fetch_register, arm_cannot_store_register, arm_get_pc, arm_set_pc, #ifndef __ARM_EABI__ (const unsigned char *) &arm_breakpoint, #else (const unsigned char *) &arm_eabi_breakpoint, #endif arm_breakpoint_len, arm_reinsert_addr, 0, arm_breakpoint_at, };
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