| /* GNU/Linux/MIPS specific low level interface, for the remote server for GDB. |
| Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2005, 2006, 2007, |
| 2008, 2009, 2010 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 <endian.h> |
| |
| #include "gdb_proc_service.h" |
| |
| /* Defined in auto-generated file mips-linux.c. */ |
| void init_registers_mips_linux (void); |
| /* Defined in auto-generated file mips64-linux.c. */ |
| void init_registers_mips64_linux (void); |
| |
| #ifndef PTRACE_GET_THREAD_AREA |
| #define PTRACE_GET_THREAD_AREA 25 |
| #endif |
| |
| #ifdef HAVE_SYS_REG_H |
| #include <sys/reg.h> |
| #endif |
| |
| #define mips_num_regs 73 |
| |
| #include <asm/ptrace.h> |
| |
| union mips_register |
| { |
| unsigned char buf[8]; |
| |
| /* Deliberately signed, for proper sign extension. */ |
| int reg32; |
| long long reg64; |
| }; |
| |
| /* Return the ptrace ``address'' of register REGNO. */ |
| |
| static int mips_regmap[] = { |
| -1, 1, 2, 3, 4, 5, 6, 7, |
| 8, 9, 10, 11, 12, 13, 14, 15, |
| 16, 17, 18, 19, 20, 21, 22, 23, |
| 24, 25, 26, 27, 28, 29, 30, 31, |
| |
| -1, MMLO, MMHI, BADVADDR, CAUSE, PC, |
| |
| FPR_BASE, FPR_BASE + 1, FPR_BASE + 2, FPR_BASE + 3, |
| FPR_BASE + 4, FPR_BASE + 5, FPR_BASE + 6, FPR_BASE + 7, |
| FPR_BASE + 8, FPR_BASE + 8, FPR_BASE + 10, FPR_BASE + 11, |
| FPR_BASE + 12, FPR_BASE + 13, FPR_BASE + 14, FPR_BASE + 15, |
| FPR_BASE + 16, FPR_BASE + 17, FPR_BASE + 18, FPR_BASE + 19, |
| FPR_BASE + 20, FPR_BASE + 21, FPR_BASE + 22, FPR_BASE + 23, |
| FPR_BASE + 24, FPR_BASE + 25, FPR_BASE + 26, FPR_BASE + 27, |
| FPR_BASE + 28, FPR_BASE + 29, FPR_BASE + 30, FPR_BASE + 31, |
| FPC_CSR, FPC_EIR, |
| |
| 0 |
| }; |
| |
| /* From mips-linux-nat.c. */ |
| |
| /* Pseudo registers can not be read. ptrace does not provide a way to |
| read (or set) PS_REGNUM, and there's no point in reading or setting |
| ZERO_REGNUM. We also can not set BADVADDR, CAUSE, or FCRIR via |
| ptrace(). */ |
| |
| static int |
| mips_cannot_fetch_register (int regno) |
| { |
| if (mips_regmap[regno] == -1) |
| return 1; |
| |
| if (find_regno ("r0") == regno) |
| return 1; |
| |
| return 0; |
| } |
| |
| static int |
| mips_cannot_store_register (int regno) |
| { |
| if (mips_regmap[regno] == -1) |
| return 1; |
| |
| if (find_regno ("r0") == regno) |
| return 1; |
| |
| if (find_regno ("cause") == regno) |
| return 1; |
| |
| if (find_regno ("badvaddr") == regno) |
| return 1; |
| |
| if (find_regno ("fir") == regno) |
| return 1; |
| |
| return 0; |
| } |
| |
| static CORE_ADDR |
| mips_get_pc (struct regcache *regcache) |
| { |
| union mips_register pc; |
| collect_register_by_name (regcache, "pc", pc.buf); |
| return register_size (0) == 4 ? pc.reg32 : pc.reg64; |
| } |
| |
| static void |
| mips_set_pc (struct regcache *regcache, CORE_ADDR pc) |
| { |
| union mips_register newpc; |
| if (register_size (0) == 4) |
| newpc.reg32 = pc; |
| else |
| newpc.reg64 = pc; |
| |
| supply_register_by_name (regcache, "pc", newpc.buf); |
| } |
| |
| /* Correct in either endianness. */ |
| static const unsigned int mips_breakpoint = 0x0005000d; |
| #define mips_breakpoint_len 4 |
| |
| /* 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 |
| mips_reinsert_addr (void) |
| { |
| struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
| union mips_register ra; |
| collect_register_by_name (regcache, "r31", ra.buf); |
| return register_size (0) == 4 ? ra.reg32 : ra.reg64; |
| } |
| |
| static int |
| mips_breakpoint_at (CORE_ADDR where) |
| { |
| unsigned int insn; |
| |
| (*the_target->read_memory) (where, (unsigned char *) &insn, 4); |
| if (insn == mips_breakpoint) |
| return 1; |
| |
| /* If necessary, recognize more trap instructions here. GDB only uses the |
| one. */ |
| return 0; |
| } |
| |
| /* 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; |
| } |
| |
| #ifdef HAVE_PTRACE_GETREGS |
| |
| static void |
| mips_collect_register (struct regcache *regcache, |
| int use_64bit, int regno, union mips_register *reg) |
| { |
| union mips_register tmp_reg; |
| |
| if (use_64bit) |
| { |
| collect_register (regcache, regno, &tmp_reg.reg64); |
| *reg = tmp_reg; |
| } |
| else |
| { |
| collect_register (regcache, regno, &tmp_reg.reg32); |
| reg->reg64 = tmp_reg.reg32; |
| } |
| } |
| |
| static void |
| mips_supply_register (struct regcache *regcache, |
| int use_64bit, int regno, const union mips_register *reg) |
| { |
| int offset = 0; |
| |
| /* For big-endian 32-bit targets, ignore the high four bytes of each |
| eight-byte slot. */ |
| if (__BYTE_ORDER == __BIG_ENDIAN && !use_64bit) |
| offset = 4; |
| |
| supply_register (regcache, regno, reg->buf + offset); |
| } |
| |
| static void |
| mips_collect_register_32bit (struct regcache *regcache, |
| int use_64bit, int regno, unsigned char *buf) |
| { |
| union mips_register tmp_reg; |
| int reg32; |
| |
| mips_collect_register (regcache, use_64bit, regno, &tmp_reg); |
| reg32 = tmp_reg.reg64; |
| memcpy (buf, ®32, 4); |
| } |
| |
| static void |
| mips_supply_register_32bit (struct regcache *regcache, |
| int use_64bit, int regno, const unsigned char *buf) |
| { |
| union mips_register tmp_reg; |
| int reg32; |
| |
| memcpy (®32, buf, 4); |
| tmp_reg.reg64 = reg32; |
| mips_supply_register (regcache, use_64bit, regno, &tmp_reg); |
| } |
| |
| static void |
| mips_fill_gregset (struct regcache *regcache, void *buf) |
| { |
| union mips_register *regset = buf; |
| int i, use_64bit; |
| |
| use_64bit = (register_size (0) == 8); |
| |
| for (i = 1; i < 32; i++) |
| mips_collect_register (regcache, use_64bit, i, regset + i); |
| |
| mips_collect_register (regcache, use_64bit, |
| find_regno ("lo"), regset + 32); |
| mips_collect_register (regcache, use_64bit, |
| find_regno ("hi"), regset + 33); |
| mips_collect_register (regcache, use_64bit, |
| find_regno ("pc"), regset + 34); |
| mips_collect_register (regcache, use_64bit, |
| find_regno ("badvaddr"), regset + 35); |
| mips_collect_register (regcache, use_64bit, |
| find_regno ("status"), regset + 36); |
| mips_collect_register (regcache, use_64bit, |
| find_regno ("cause"), regset + 37); |
| |
| mips_collect_register (regcache, use_64bit, |
| find_regno ("restart"), regset + 0); |
| } |
| |
| static void |
| mips_store_gregset (struct regcache *regcache, const void *buf) |
| { |
| const union mips_register *regset = buf; |
| int i, use_64bit; |
| |
| use_64bit = (register_size (0) == 8); |
| |
| for (i = 0; i < 32; i++) |
| mips_supply_register (regcache, use_64bit, i, regset + i); |
| |
| mips_supply_register (regcache, use_64bit, find_regno ("lo"), regset + 32); |
| mips_supply_register (regcache, use_64bit, find_regno ("hi"), regset + 33); |
| mips_supply_register (regcache, use_64bit, find_regno ("pc"), regset + 34); |
| mips_supply_register (regcache, use_64bit, |
| find_regno ("badvaddr"), regset + 35); |
| mips_supply_register (regcache, use_64bit, |
| find_regno ("status"), regset + 36); |
| mips_supply_register (regcache, use_64bit, |
| find_regno ("cause"), regset + 37); |
| |
| mips_supply_register (regcache, use_64bit, |
| find_regno ("restart"), regset + 0); |
| } |
| |
| static void |
| mips_fill_fpregset (struct regcache *regcache, void *buf) |
| { |
| union mips_register *regset = buf; |
| int i, use_64bit, first_fp, big_endian; |
| |
| use_64bit = (register_size (0) == 8); |
| first_fp = find_regno ("f0"); |
| big_endian = (__BYTE_ORDER == __BIG_ENDIAN); |
| |
| /* See GDB for a discussion of this peculiar layout. */ |
| for (i = 0; i < 32; i++) |
| if (use_64bit) |
| collect_register (regcache, first_fp + i, regset[i].buf); |
| else |
| collect_register (regcache, first_fp + i, |
| regset[i & ~1].buf + 4 * (big_endian != (i & 1))); |
| |
| mips_collect_register_32bit (regcache, use_64bit, |
| find_regno ("fcsr"), regset[32].buf); |
| mips_collect_register_32bit (regcache, use_64bit, find_regno ("fir"), |
| regset[32].buf + 4); |
| } |
| |
| static void |
| mips_store_fpregset (struct regcache *regcache, const void *buf) |
| { |
| const union mips_register *regset = buf; |
| int i, use_64bit, first_fp, big_endian; |
| |
| use_64bit = (register_size (0) == 8); |
| first_fp = find_regno ("f0"); |
| big_endian = (__BYTE_ORDER == __BIG_ENDIAN); |
| |
| /* See GDB for a discussion of this peculiar layout. */ |
| for (i = 0; i < 32; i++) |
| if (use_64bit) |
| supply_register (regcache, first_fp + i, regset[i].buf); |
| else |
| supply_register (regcache, first_fp + i, |
| regset[i & ~1].buf + 4 * (big_endian != (i & 1))); |
| |
| mips_supply_register_32bit (regcache, use_64bit, |
| find_regno ("fcsr"), regset[32].buf); |
| mips_supply_register_32bit (regcache, use_64bit, find_regno ("fir"), |
| regset[32].buf + 4); |
| } |
| #endif /* HAVE_PTRACE_GETREGS */ |
| |
| struct regset_info target_regsets[] = { |
| #ifdef HAVE_PTRACE_GETREGS |
| { PTRACE_GETREGS, PTRACE_SETREGS, 0, 38 * 8, GENERAL_REGS, |
| mips_fill_gregset, mips_store_gregset }, |
| { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, 33 * 8, FP_REGS, |
| mips_fill_fpregset, mips_store_fpregset }, |
| #endif /* HAVE_PTRACE_GETREGS */ |
| { 0, 0, 0, -1, -1, NULL, NULL } |
| }; |
| |
| struct linux_target_ops the_low_target = { |
| #ifdef __mips64 |
| init_registers_mips64_linux, |
| #else |
| init_registers_mips_linux, |
| #endif |
| mips_num_regs, |
| mips_regmap, |
| mips_cannot_fetch_register, |
| mips_cannot_store_register, |
| mips_get_pc, |
| mips_set_pc, |
| (const unsigned char *) &mips_breakpoint, |
| mips_breakpoint_len, |
| mips_reinsert_addr, |
| 0, |
| mips_breakpoint_at, |
| }; |