522 lines
14 KiB
C
522 lines
14 KiB
C
/* GNU/Linux/MIPS specific low level interface, for the remote server for GDB.
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Copyright (C) 1995-2013 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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "server.h"
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#include "linux-low.h"
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#include <sys/ptrace.h>
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#include <endian.h>
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#include "gdb_proc_service.h"
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/* Defined in auto-generated file mips-linux.c. */
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void init_registers_mips_linux (void);
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extern const struct target_desc *tdesc_mips_linux;
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/* Defined in auto-generated file mips-dsp-linux.c. */
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void init_registers_mips_dsp_linux (void);
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extern const struct target_desc *tdesc_mips_dsp_linux;
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/* Defined in auto-generated file mips64-linux.c. */
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void init_registers_mips64_linux (void);
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extern const struct target_desc *tdesc_mips64_linux;
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/* Defined in auto-generated file mips64-dsp-linux.c. */
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void init_registers_mips64_dsp_linux (void);
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extern const struct target_desc *tdesc_mips64_dsp_linux;
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#ifdef __mips64
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#define tdesc_mips_linux tdesc_mips64_linux
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#define tdesc_mips_dsp_linux tdesc_mips64_dsp_linux
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#endif
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#ifndef PTRACE_GET_THREAD_AREA
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#define PTRACE_GET_THREAD_AREA 25
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#endif
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#ifdef HAVE_SYS_REG_H
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#include <sys/reg.h>
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#endif
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#define mips_num_regs 73
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#define mips_dsp_num_regs 80
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#include <asm/ptrace.h>
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#ifndef DSP_BASE
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#define DSP_BASE 71
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#define DSP_CONTROL 77
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#endif
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union mips_register
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{
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unsigned char buf[8];
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/* Deliberately signed, for proper sign extension. */
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int reg32;
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long long reg64;
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};
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/* Return the ptrace ``address'' of register REGNO. */
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#define mips_base_regs \
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-1, 1, 2, 3, 4, 5, 6, 7, \
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8, 9, 10, 11, 12, 13, 14, 15, \
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16, 17, 18, 19, 20, 21, 22, 23, \
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24, 25, 26, 27, 28, 29, 30, 31, \
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\
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-1, MMLO, MMHI, BADVADDR, CAUSE, PC, \
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\
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FPR_BASE, FPR_BASE + 1, FPR_BASE + 2, FPR_BASE + 3, \
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FPR_BASE + 4, FPR_BASE + 5, FPR_BASE + 6, FPR_BASE + 7, \
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FPR_BASE + 8, FPR_BASE + 9, FPR_BASE + 10, FPR_BASE + 11, \
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FPR_BASE + 12, FPR_BASE + 13, FPR_BASE + 14, FPR_BASE + 15, \
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FPR_BASE + 16, FPR_BASE + 17, FPR_BASE + 18, FPR_BASE + 19, \
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FPR_BASE + 20, FPR_BASE + 21, FPR_BASE + 22, FPR_BASE + 23, \
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FPR_BASE + 24, FPR_BASE + 25, FPR_BASE + 26, FPR_BASE + 27, \
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FPR_BASE + 28, FPR_BASE + 29, FPR_BASE + 30, FPR_BASE + 31, \
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FPC_CSR, FPC_EIR
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#define mips_dsp_regs \
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DSP_BASE, DSP_BASE + 1, DSP_BASE + 2, DSP_BASE + 3, \
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DSP_BASE + 4, DSP_BASE + 5, \
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DSP_CONTROL
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static int mips_regmap[mips_num_regs] = {
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mips_base_regs,
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0
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};
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static int mips_dsp_regmap[mips_dsp_num_regs] = {
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mips_base_regs,
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mips_dsp_regs,
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0
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};
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/* DSP registers are not in any regset and can only be accessed
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individually. */
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static unsigned char mips_dsp_regset_bitmap[(mips_dsp_num_regs + 7) / 8] = {
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0xfe, 0xff, 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0xff, 0x80
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};
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static int have_dsp = -1;
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/* Try peeking at an arbitrarily chosen DSP register and pick the available
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user register set accordingly. */
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static const struct target_desc *
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mips_read_description (void)
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{
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if (have_dsp < 0)
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{
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int pid = lwpid_of (get_thread_lwp (current_inferior));
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ptrace (PTRACE_PEEKUSER, pid, DSP_CONTROL, 0);
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switch (errno)
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{
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case 0:
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have_dsp = 1;
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break;
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case EIO:
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have_dsp = 0;
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break;
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default:
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perror_with_name ("ptrace");
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break;
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}
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}
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return have_dsp ? tdesc_mips_dsp_linux : tdesc_mips_linux;
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}
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static void
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mips_arch_setup (void)
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{
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current_process ()->tdesc = mips_read_description ();
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}
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static struct usrregs_info *
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get_usrregs_info (void)
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{
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const struct regs_info *regs_info = the_low_target.regs_info ();
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return regs_info->usrregs;
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}
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/* From mips-linux-nat.c. */
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/* Pseudo registers can not be read. ptrace does not provide a way to
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read (or set) PS_REGNUM, and there's no point in reading or setting
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ZERO_REGNUM. We also can not set BADVADDR, CAUSE, or FCRIR via
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ptrace(). */
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static int
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mips_cannot_fetch_register (int regno)
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{
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const struct target_desc *tdesc;
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if (get_usrregs_info ()->regmap[regno] == -1)
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return 1;
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tdesc = current_process ()->tdesc;
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if (find_regno (tdesc, "r0") == regno)
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return 1;
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return 0;
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}
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static int
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mips_cannot_store_register (int regno)
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{
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const struct target_desc *tdesc;
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if (get_usrregs_info ()->regmap[regno] == -1)
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return 1;
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tdesc = current_process ()->tdesc;
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if (find_regno (tdesc, "r0") == regno)
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return 1;
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if (find_regno (tdesc, "cause") == regno)
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return 1;
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if (find_regno (tdesc, "badvaddr") == regno)
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return 1;
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if (find_regno (tdesc, "fir") == regno)
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return 1;
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return 0;
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}
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static CORE_ADDR
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mips_get_pc (struct regcache *regcache)
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{
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union mips_register pc;
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collect_register_by_name (regcache, "pc", pc.buf);
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return register_size (regcache->tdesc, 0) == 4 ? pc.reg32 : pc.reg64;
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}
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static void
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mips_set_pc (struct regcache *regcache, CORE_ADDR pc)
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{
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union mips_register newpc;
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if (register_size (regcache->tdesc, 0) == 4)
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newpc.reg32 = pc;
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else
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newpc.reg64 = pc;
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supply_register_by_name (regcache, "pc", newpc.buf);
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}
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/* Correct in either endianness. */
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static const unsigned int mips_breakpoint = 0x0005000d;
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#define mips_breakpoint_len 4
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/* We only place breakpoints in empty marker functions, and thread locking
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is outside of the function. So rather than importing software single-step,
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we can just run until exit. */
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static CORE_ADDR
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mips_reinsert_addr (void)
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{
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struct regcache *regcache = get_thread_regcache (current_inferior, 1);
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union mips_register ra;
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collect_register_by_name (regcache, "r31", ra.buf);
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return register_size (regcache->tdesc, 0) == 4 ? ra.reg32 : ra.reg64;
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}
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static int
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mips_breakpoint_at (CORE_ADDR where)
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{
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unsigned int insn;
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(*the_target->read_memory) (where, (unsigned char *) &insn, 4);
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if (insn == mips_breakpoint)
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return 1;
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/* If necessary, recognize more trap instructions here. GDB only uses the
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one. */
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return 0;
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}
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/* Fetch the thread-local storage pointer for libthread_db. */
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ps_err_e
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ps_get_thread_area (const struct ps_prochandle *ph,
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lwpid_t lwpid, int idx, void **base)
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{
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if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
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return PS_ERR;
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/* IDX is the bias from the thread pointer to the beginning of the
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thread descriptor. It has to be subtracted due to implementation
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quirks in libthread_db. */
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*base = (void *) ((char *)*base - idx);
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return PS_OK;
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}
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#ifdef HAVE_PTRACE_GETREGS
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static void
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mips_collect_register (struct regcache *regcache,
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int use_64bit, int regno, union mips_register *reg)
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{
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union mips_register tmp_reg;
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if (use_64bit)
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{
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collect_register (regcache, regno, &tmp_reg.reg64);
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*reg = tmp_reg;
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}
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else
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{
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collect_register (regcache, regno, &tmp_reg.reg32);
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reg->reg64 = tmp_reg.reg32;
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}
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}
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static void
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mips_supply_register (struct regcache *regcache,
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int use_64bit, int regno, const union mips_register *reg)
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{
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int offset = 0;
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/* For big-endian 32-bit targets, ignore the high four bytes of each
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eight-byte slot. */
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if (__BYTE_ORDER == __BIG_ENDIAN && !use_64bit)
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offset = 4;
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supply_register (regcache, regno, reg->buf + offset);
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}
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static void
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mips_collect_register_32bit (struct regcache *regcache,
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int use_64bit, int regno, unsigned char *buf)
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{
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union mips_register tmp_reg;
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int reg32;
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mips_collect_register (regcache, use_64bit, regno, &tmp_reg);
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reg32 = tmp_reg.reg64;
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memcpy (buf, ®32, 4);
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}
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static void
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mips_supply_register_32bit (struct regcache *regcache,
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int use_64bit, int regno, const unsigned char *buf)
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{
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union mips_register tmp_reg;
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int reg32;
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memcpy (®32, buf, 4);
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tmp_reg.reg64 = reg32;
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mips_supply_register (regcache, use_64bit, regno, &tmp_reg);
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}
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static void
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mips_fill_gregset (struct regcache *regcache, void *buf)
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{
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union mips_register *regset = buf;
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int i, use_64bit;
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const struct target_desc *tdesc = regcache->tdesc;
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use_64bit = (register_size (tdesc, 0) == 8);
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for (i = 1; i < 32; i++)
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mips_collect_register (regcache, use_64bit, i, regset + i);
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mips_collect_register (regcache, use_64bit,
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find_regno (tdesc, "lo"), regset + 32);
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mips_collect_register (regcache, use_64bit,
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find_regno (tdesc, "hi"), regset + 33);
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mips_collect_register (regcache, use_64bit,
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find_regno (tdesc, "pc"), regset + 34);
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mips_collect_register (regcache, use_64bit,
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find_regno (tdesc, "badvaddr"), regset + 35);
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mips_collect_register (regcache, use_64bit,
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find_regno (tdesc, "status"), regset + 36);
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mips_collect_register (regcache, use_64bit,
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find_regno (tdesc, "cause"), regset + 37);
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mips_collect_register (regcache, use_64bit,
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find_regno (tdesc, "restart"), regset + 0);
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}
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static void
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mips_store_gregset (struct regcache *regcache, const void *buf)
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{
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const union mips_register *regset = buf;
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int i, use_64bit;
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use_64bit = (register_size (regcache->tdesc, 0) == 8);
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for (i = 0; i < 32; i++)
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mips_supply_register (regcache, use_64bit, i, regset + i);
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mips_supply_register (regcache, use_64bit,
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find_regno (regcache->tdesc, "lo"), regset + 32);
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mips_supply_register (regcache, use_64bit,
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find_regno (regcache->tdesc, "hi"), regset + 33);
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mips_supply_register (regcache, use_64bit,
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find_regno (regcache->tdesc, "pc"), regset + 34);
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mips_supply_register (regcache, use_64bit,
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find_regno (regcache->tdesc, "badvaddr"), regset + 35);
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mips_supply_register (regcache, use_64bit,
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find_regno (regcache->tdesc, "status"), regset + 36);
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mips_supply_register (regcache, use_64bit,
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find_regno (regcache->tdesc, "cause"), regset + 37);
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mips_supply_register (regcache, use_64bit,
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find_regno (regcache->tdesc, "restart"), regset + 0);
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}
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static void
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mips_fill_fpregset (struct regcache *regcache, void *buf)
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{
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union mips_register *regset = buf;
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int i, use_64bit, first_fp, big_endian;
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use_64bit = (register_size (regcache->tdesc, 0) == 8);
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first_fp = find_regno (regcache->tdesc, "f0");
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big_endian = (__BYTE_ORDER == __BIG_ENDIAN);
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/* See GDB for a discussion of this peculiar layout. */
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for (i = 0; i < 32; i++)
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if (use_64bit)
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collect_register (regcache, first_fp + i, regset[i].buf);
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else
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collect_register (regcache, first_fp + i,
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regset[i & ~1].buf + 4 * (big_endian != (i & 1)));
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mips_collect_register_32bit (regcache, use_64bit,
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find_regno (regcache->tdesc, "fcsr"), regset[32].buf);
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mips_collect_register_32bit (regcache, use_64bit,
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find_regno (regcache->tdesc, "fir"),
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regset[32].buf + 4);
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}
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static void
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mips_store_fpregset (struct regcache *regcache, const void *buf)
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{
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const union mips_register *regset = buf;
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int i, use_64bit, first_fp, big_endian;
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use_64bit = (register_size (regcache->tdesc, 0) == 8);
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first_fp = find_regno (regcache->tdesc, "f0");
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big_endian = (__BYTE_ORDER == __BIG_ENDIAN);
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/* See GDB for a discussion of this peculiar layout. */
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for (i = 0; i < 32; i++)
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if (use_64bit)
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supply_register (regcache, first_fp + i, regset[i].buf);
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else
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supply_register (regcache, first_fp + i,
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regset[i & ~1].buf + 4 * (big_endian != (i & 1)));
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mips_supply_register_32bit (regcache, use_64bit,
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find_regno (regcache->tdesc, "fcsr"),
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regset[32].buf);
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mips_supply_register_32bit (regcache, use_64bit,
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find_regno (regcache->tdesc, "fir"),
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regset[32].buf + 4);
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}
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#endif /* HAVE_PTRACE_GETREGS */
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static struct regset_info mips_regsets[] = {
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#ifdef HAVE_PTRACE_GETREGS
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{ PTRACE_GETREGS, PTRACE_SETREGS, 0, 38 * 8, GENERAL_REGS,
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mips_fill_gregset, mips_store_gregset },
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{ PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, 33 * 8, FP_REGS,
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mips_fill_fpregset, mips_store_fpregset },
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#endif /* HAVE_PTRACE_GETREGS */
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{ 0, 0, 0, -1, -1, NULL, NULL }
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};
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static struct regsets_info mips_regsets_info =
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{
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mips_regsets, /* regsets */
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0, /* num_regsets */
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NULL, /* disabled_regsets */
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};
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static struct usrregs_info mips_dsp_usrregs_info =
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{
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mips_dsp_num_regs,
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mips_dsp_regmap,
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};
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static struct usrregs_info mips_usrregs_info =
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{
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mips_num_regs,
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mips_regmap,
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};
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static struct regs_info dsp_regs_info =
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{
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mips_dsp_regset_bitmap,
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&mips_dsp_usrregs_info,
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&mips_regsets_info
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};
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static struct regs_info regs_info =
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{
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NULL, /* regset_bitmap */
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&mips_usrregs_info,
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&mips_regsets_info
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};
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static const struct regs_info *
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mips_regs_info (void)
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{
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if (have_dsp)
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return &dsp_regs_info;
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else
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return ®s_info;
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}
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struct linux_target_ops the_low_target = {
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mips_arch_setup,
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mips_regs_info,
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mips_cannot_fetch_register,
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mips_cannot_store_register,
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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);
|
|
}
|