/* GNU/Linux/MIPS specific low level interface, for the remote server for GDB.
- Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002
- Free Software Foundation, Inc.
+ Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2005, 2006, 2007,
+ 2008, 2009, 2010, 2011 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 2 of the License, or
+ 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,
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, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ 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
-int num_regs = 90;
+#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. */
-/* Matches mips_generic32_regs */
-int regmap[] = {
- 0, 1, 2, 3, 4, 5, 6, 7,
+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,
FPR_BASE + 28, FPR_BASE + 29, FPR_BASE + 30, FPR_BASE + 31,
FPC_CSR, FPC_EIR,
- -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
+ 0
};
/* From mips-linux-nat.c. */
ZERO_REGNUM. We also can not set BADVADDR, CAUSE, or FCRIR via
ptrace(). */
-int
-cannot_fetch_register (int regno)
+static int
+mips_cannot_fetch_register (int regno)
{
- if (regmap[regno] == -1)
+ if (mips_regmap[regno] == -1)
return 1;
- if (find_regno ("zero") == regno)
+ if (find_regno ("r0") == regno)
return 1;
return 0;
}
-int
-cannot_store_register (int regno)
+static int
+mips_cannot_store_register (int regno)
{
- if (regmap[regno] == -1)
+ if (mips_regmap[regno] == -1)
return 1;
- if (find_regno ("zero") == regno)
+ if (find_regno ("r0") == regno)
return 1;
if (find_regno ("cause") == regno)
return 1;
- if (find_regno ("bad") == regno)
+ if (find_regno ("badvaddr") == regno)
return 1;
if (find_regno ("fir") == regno)
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,
+};
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