| /* GNU/Linux/MIPS specific low level interface, for the remote server for GDB. |
| Copyright (C) 1995-2013 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); |
| extern const struct target_desc *tdesc_mips_linux; |
| |
| /* Defined in auto-generated file mips-dsp-linux.c. */ |
| void init_registers_mips_dsp_linux (void); |
| extern const struct target_desc *tdesc_mips_dsp_linux; |
| |
| /* Defined in auto-generated file mips64-linux.c. */ |
| void init_registers_mips64_linux (void); |
| extern const struct target_desc *tdesc_mips64_linux; |
| |
| /* Defined in auto-generated file mips64-dsp-linux.c. */ |
| void init_registers_mips64_dsp_linux (void); |
| extern const struct target_desc *tdesc_mips64_dsp_linux; |
| |
| #ifdef __mips64 |
| #define tdesc_mips_linux tdesc_mips64_linux |
| #define tdesc_mips_dsp_linux tdesc_mips64_dsp_linux |
| #endif |
| |
| #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 |
| #define mips_dsp_num_regs 80 |
| |
| #include <asm/ptrace.h> |
| |
| #ifndef DSP_BASE |
| #define DSP_BASE 71 |
| #define DSP_CONTROL 77 |
| #endif |
| |
| 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. */ |
| |
| #define mips_base_regs \ |
| -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 + 9, 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 |
| |
| #define mips_dsp_regs \ |
| DSP_BASE, DSP_BASE + 1, DSP_BASE + 2, DSP_BASE + 3, \ |
| DSP_BASE + 4, DSP_BASE + 5, \ |
| DSP_CONTROL |
| |
| static int mips_regmap[mips_num_regs] = { |
| mips_base_regs, |
| 0 |
| }; |
| |
| static int mips_dsp_regmap[mips_dsp_num_regs] = { |
| mips_base_regs, |
| mips_dsp_regs, |
| 0 |
| }; |
| |
| /* DSP registers are not in any regset and can only be accessed |
| individually. */ |
| |
| static unsigned char mips_dsp_regset_bitmap[(mips_dsp_num_regs + 7) / 8] = { |
| 0xfe, 0xff, 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0xff, 0x80 |
| }; |
| |
| static int have_dsp = -1; |
| |
| /* Try peeking at an arbitrarily chosen DSP register and pick the available |
| user register set accordingly. */ |
| |
| static const struct target_desc * |
| mips_read_description (void) |
| { |
| if (have_dsp < 0) |
| { |
| int pid = lwpid_of (get_thread_lwp (current_inferior)); |
| |
| ptrace (PTRACE_PEEKUSER, pid, DSP_CONTROL, 0); |
| switch (errno) |
| { |
| case 0: |
| have_dsp = 1; |
| break; |
| case EIO: |
| have_dsp = 0; |
| break; |
| default: |
| perror_with_name ("ptrace"); |
| break; |
| } |
| } |
| |
| return have_dsp ? tdesc_mips_dsp_linux : tdesc_mips_linux; |
| } |
| |
| static void |
| mips_arch_setup (void) |
| { |
| current_process ()->tdesc = mips_read_description (); |
| } |
| |
| static struct usrregs_info * |
| get_usrregs_info (void) |
| { |
| const struct regs_info *regs_info = the_low_target.regs_info (); |
| |
| return regs_info->usrregs; |
| } |
| |
| /* 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) |
| { |
| const struct target_desc *tdesc; |
| |
| if (get_usrregs_info ()->regmap[regno] == -1) |
| return 1; |
| |
| tdesc = current_process ()->tdesc; |
| |
| if (find_regno (tdesc, "r0") == regno) |
| return 1; |
| |
| return 0; |
| } |
| |
| static int |
| mips_cannot_store_register (int regno) |
| { |
| const struct target_desc *tdesc; |
| |
| if (get_usrregs_info ()->regmap[regno] == -1) |
| return 1; |
| |
| tdesc = current_process ()->tdesc; |
| |
| if (find_regno (tdesc, "r0") == regno) |
| return 1; |
| |
| if (find_regno (tdesc, "cause") == regno) |
| return 1; |
| |
| if (find_regno (tdesc, "badvaddr") == regno) |
| return 1; |
| |
| if (find_regno (tdesc, "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 (regcache->tdesc, 0) == 4 ? pc.reg32 : pc.reg64; |
| } |
| |
| static void |
| mips_set_pc (struct regcache *regcache, CORE_ADDR pc) |
| { |
| union mips_register newpc; |
| if (register_size (regcache->tdesc, 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 (regcache->tdesc, 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; |
| const struct target_desc *tdesc = regcache->tdesc; |
| |
| use_64bit = (register_size (tdesc, 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 (tdesc, "lo"), regset + 32); |
| mips_collect_register (regcache, use_64bit, |
| find_regno (tdesc, "hi"), regset + 33); |
| mips_collect_register (regcache, use_64bit, |
| find_regno (tdesc, "pc"), regset + 34); |
| mips_collect_register (regcache, use_64bit, |
| find_regno (tdesc, "badvaddr"), regset + 35); |
| mips_collect_register (regcache, use_64bit, |
| find_regno (tdesc, "status"), regset + 36); |
| mips_collect_register (regcache, use_64bit, |
| find_regno (tdesc, "cause"), regset + 37); |
| |
| mips_collect_register (regcache, use_64bit, |
| find_regno (tdesc, "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 (regcache->tdesc, 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 (regcache->tdesc, "lo"), regset + 32); |
| mips_supply_register (regcache, use_64bit, |
| find_regno (regcache->tdesc, "hi"), regset + 33); |
| mips_supply_register (regcache, use_64bit, |
| find_regno (regcache->tdesc, "pc"), regset + 34); |
| mips_supply_register (regcache, use_64bit, |
| find_regno (regcache->tdesc, "badvaddr"), regset + 35); |
| mips_supply_register (regcache, use_64bit, |
| find_regno (regcache->tdesc, "status"), regset + 36); |
| mips_supply_register (regcache, use_64bit, |
| find_regno (regcache->tdesc, "cause"), regset + 37); |
| |
| mips_supply_register (regcache, use_64bit, |
| find_regno (regcache->tdesc, "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 (regcache->tdesc, 0) == 8); |
| first_fp = find_regno (regcache->tdesc, "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 (regcache->tdesc, "fcsr"), regset[32].buf); |
| mips_collect_register_32bit (regcache, use_64bit, |
| find_regno (regcache->tdesc, "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 (regcache->tdesc, 0) == 8); |
| first_fp = find_regno (regcache->tdesc, "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 (regcache->tdesc, "fcsr"), |
| regset[32].buf); |
| mips_supply_register_32bit (regcache, use_64bit, |
| find_regno (regcache->tdesc, "fir"), |
| regset[32].buf + 4); |
| } |
| #endif /* HAVE_PTRACE_GETREGS */ |
| |
| static struct regset_info mips_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 } |
| }; |
| |
| static struct regsets_info mips_regsets_info = |
| { |
| mips_regsets, /* regsets */ |
| 0, /* num_regsets */ |
| NULL, /* disabled_regsets */ |
| }; |
| |
| static struct usrregs_info mips_dsp_usrregs_info = |
| { |
| mips_dsp_num_regs, |
| mips_dsp_regmap, |
| }; |
| |
| static struct usrregs_info mips_usrregs_info = |
| { |
| mips_num_regs, |
| mips_regmap, |
| }; |
| |
| static struct regs_info dsp_regs_info = |
| { |
| mips_dsp_regset_bitmap, |
| &mips_dsp_usrregs_info, |
| &mips_regsets_info |
| }; |
| |
| static struct regs_info regs_info = |
| { |
| NULL, /* regset_bitmap */ |
| &mips_usrregs_info, |
| &mips_regsets_info |
| }; |
| |
| static const struct regs_info * |
| mips_regs_info (void) |
| { |
| if (have_dsp) |
| return &dsp_regs_info; |
| else |
| return ®s_info; |
| } |
| |
| struct linux_target_ops the_low_target = { |
| mips_arch_setup, |
| mips_regs_info, |
| mips_cannot_fetch_register, |
| mips_cannot_store_register, |
| NULL, /* fetch_register */ |
| mips_get_pc, |
| mips_set_pc, |
| (const unsigned char *) &mips_breakpoint, |
| mips_breakpoint_len, |
| mips_reinsert_addr, |
| 0, |
| mips_breakpoint_at, |
| }; |
| |
| void |
| initialize_low_arch (void) |
| { |
| /* Initialize the Linux target descriptions. */ |
| init_registers_mips_linux (); |
| init_registers_mips_dsp_linux (); |
| init_registers_mips64_linux (); |
| init_registers_mips64_dsp_linux (); |
| |
| initialize_regsets_info (&mips_regsets_info); |
| } |