21b0f40c16
(PTRACE_GET_THREAD_AREA): Define. (ps_get_thread_area): New function. * Makefile.in (linux-i386-low.o, linux-mips-low.o) (linux-x86-64-low.o): Update.
180 lines
4.5 KiB
C
180 lines
4.5 KiB
C
/* GNU/Linux/MIPS specific low level interface, for the remote server for GDB.
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Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2005, 2006
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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 2 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, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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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 "gdb_proc_service.h"
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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 90
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#include <asm/ptrace.h>
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/* Return the ptrace ``address'' of register REGNO. */
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/* Matches mips_generic32_regs */
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static int mips_regmap[] = {
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0, 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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-1, MMLO, MMHI, BADVADDR, CAUSE, PC,
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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 + 8, 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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-1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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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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if (mips_regmap[regno] == -1)
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return 1;
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if (find_regno ("zero") == 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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if (mips_regmap[regno] == -1)
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return 1;
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if (find_regno ("zero") == regno)
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return 1;
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if (find_regno ("cause") == regno)
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return 1;
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if (find_regno ("bad") == regno)
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return 1;
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if (find_regno ("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 ()
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{
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unsigned long pc;
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collect_register_by_name ("pc", &pc);
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return pc;
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}
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static void
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mips_set_pc (CORE_ADDR pc)
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{
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unsigned long newpc = pc;
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supply_register_by_name ("pc", &newpc);
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}
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/* Correct in either endianness. */
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static const unsigned long 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 ()
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{
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unsigned long pc;
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collect_register_by_name ("ra", &pc);
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return pc;
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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 long 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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struct linux_target_ops the_low_target = {
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mips_num_regs,
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mips_regmap,
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mips_cannot_fetch_register,
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mips_cannot_store_register,
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mips_get_pc,
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mips_set_pc,
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(const unsigned char *) &mips_breakpoint,
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mips_breakpoint_len,
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mips_reinsert_addr,
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0,
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mips_breakpoint_at,
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};
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