/* Native-dependent code for GNU/Linux on MIPS processors. Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 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 . */ #include "defs.h" #include "inferior.h" #include "mips-tdep.h" #include "target.h" #include "regcache.h" #include "linux-nat.h" #include "mips-linux-tdep.h" #include "target-descriptions.h" #include "gdb_proc_service.h" #include "gregset.h" #include #include #include "features/mips-linux.c" #include "features/mips64-linux.c" #ifndef PTRACE_GET_THREAD_AREA #define PTRACE_GET_THREAD_AREA 25 #endif /* Assume that we have PTRACE_GETREGS et al. support. If we do not, we'll clear this and use PTRACE_PEEKUSER instead. */ static int have_ptrace_regsets = 1; /* Saved function pointers to fetch and store a single register using PTRACE_PEEKUSER and PTRACE_POKEUSER. */ void (*super_fetch_registers) (struct target_ops *, struct regcache *, int); void (*super_store_registers) (struct target_ops *, struct regcache *, int); /* Map gdb internal register number to ptrace ``address''. These ``addresses'' are normally defined in . ptrace does not provide a way to read (or set) MIPS_PS_REGNUM, and there's no point in reading or setting MIPS_ZERO_REGNUM. We also can not set BADVADDR, CAUSE, or FCRIR via ptrace(). */ static CORE_ADDR mips_linux_register_addr (struct gdbarch *gdbarch, int regno, int store) { CORE_ADDR regaddr; if (regno < 0 || regno >= gdbarch_num_regs (gdbarch)) error (_("Bogon register number %d."), regno); if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32) regaddr = regno; else if ((regno >= mips_regnum (gdbarch)->fp0) && (regno < mips_regnum (gdbarch)->fp0 + 32)) regaddr = FPR_BASE + (regno - mips_regnum (gdbarch)->fp0); else if (regno == mips_regnum (gdbarch)->pc) regaddr = PC; else if (regno == mips_regnum (gdbarch)->cause) regaddr = store? (CORE_ADDR) -1 : CAUSE; else if (regno == mips_regnum (gdbarch)->badvaddr) regaddr = store? (CORE_ADDR) -1 : BADVADDR; else if (regno == mips_regnum (gdbarch)->lo) regaddr = MMLO; else if (regno == mips_regnum (gdbarch)->hi) regaddr = MMHI; else if (regno == mips_regnum (gdbarch)->fp_control_status) regaddr = FPC_CSR; else if (regno == mips_regnum (gdbarch)->fp_implementation_revision) regaddr = store? (CORE_ADDR) -1 : FPC_EIR; else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM) regaddr = 0; else regaddr = (CORE_ADDR) -1; return regaddr; } static CORE_ADDR mips64_linux_register_addr (struct gdbarch *gdbarch, int regno, int store) { CORE_ADDR regaddr; if (regno < 0 || regno >= gdbarch_num_regs (gdbarch)) error (_("Bogon register number %d."), regno); if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32) regaddr = regno; else if ((regno >= mips_regnum (gdbarch)->fp0) && (regno < mips_regnum (gdbarch)->fp0 + 32)) regaddr = MIPS64_FPR_BASE + (regno - gdbarch_fp0_regnum (gdbarch)); else if (regno == mips_regnum (gdbarch)->pc) regaddr = MIPS64_PC; else if (regno == mips_regnum (gdbarch)->cause) regaddr = store? (CORE_ADDR) -1 : MIPS64_CAUSE; else if (regno == mips_regnum (gdbarch)->badvaddr) regaddr = store? (CORE_ADDR) -1 : MIPS64_BADVADDR; else if (regno == mips_regnum (gdbarch)->lo) regaddr = MIPS64_MMLO; else if (regno == mips_regnum (gdbarch)->hi) regaddr = MIPS64_MMHI; else if (regno == mips_regnum (gdbarch)->fp_control_status) regaddr = MIPS64_FPC_CSR; else if (regno == mips_regnum (gdbarch)->fp_implementation_revision) regaddr = store? (CORE_ADDR) -1 : MIPS64_FPC_EIR; else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM) regaddr = 0; else regaddr = (CORE_ADDR) -1; return regaddr; } /* 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; } /* Wrapper functions. These are only used by libthread_db. */ void supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) { if (mips_isa_regsize (get_regcache_arch (regcache)) == 4) mips_supply_gregset (regcache, (const mips_elf_gregset_t *) gregsetp); else mips64_supply_gregset (regcache, (const mips64_elf_gregset_t *) gregsetp); } void fill_gregset (const struct regcache *regcache, gdb_gregset_t *gregsetp, int regno) { if (mips_isa_regsize (get_regcache_arch (regcache)) == 4) mips_fill_gregset (regcache, (mips_elf_gregset_t *) gregsetp, regno); else mips64_fill_gregset (regcache, (mips64_elf_gregset_t *) gregsetp, regno); } void supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp) { if (mips_isa_regsize (get_regcache_arch (regcache)) == 4) mips_supply_fpregset (regcache, (const mips_elf_fpregset_t *) fpregsetp); else mips64_supply_fpregset (regcache, (const mips64_elf_fpregset_t *) fpregsetp); } void fill_fpregset (const struct regcache *regcache, gdb_fpregset_t *fpregsetp, int regno) { if (mips_isa_regsize (get_regcache_arch (regcache)) == 4) mips_fill_fpregset (regcache, (mips_elf_fpregset_t *) fpregsetp, regno); else mips64_fill_fpregset (regcache, (mips64_elf_fpregset_t *) fpregsetp, regno); } /* Fetch REGNO (or all registers if REGNO == -1) from the target using PTRACE_GETREGS et al. */ static void mips64_linux_regsets_fetch_registers (struct regcache *regcache, int regno) { struct gdbarch *gdbarch = get_regcache_arch (regcache); int is_fp; int tid; if (regno >= mips_regnum (gdbarch)->fp0 && regno <= mips_regnum (gdbarch)->fp0 + 32) is_fp = 1; else if (regno == mips_regnum (gdbarch)->fp_control_status) is_fp = 1; else if (regno == mips_regnum (gdbarch)->fp_implementation_revision) is_fp = 1; else is_fp = 0; tid = ptid_get_lwp (inferior_ptid); if (tid == 0) tid = ptid_get_pid (inferior_ptid); if (regno == -1 || !is_fp) { mips64_elf_gregset_t regs; if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1) { if (errno == EIO) { have_ptrace_regsets = 0; return; } perror_with_name (_("Couldn't get registers")); } mips64_supply_gregset (regcache, (const mips64_elf_gregset_t *) ®s); } if (regno == -1 || is_fp) { mips64_elf_fpregset_t fp_regs; if (ptrace (PTRACE_GETFPREGS, tid, 0L, (PTRACE_TYPE_ARG3) &fp_regs) == -1) { if (errno == EIO) { have_ptrace_regsets = 0; return; } perror_with_name (_("Couldn't get FP registers")); } mips64_supply_fpregset (regcache, (const mips64_elf_fpregset_t *) &fp_regs); } } /* Store REGNO (or all registers if REGNO == -1) to the target using PTRACE_SETREGS et al. */ static void mips64_linux_regsets_store_registers (const struct regcache *regcache, int regno) { struct gdbarch *gdbarch = get_regcache_arch (regcache); int is_fp; int tid; if (regno >= mips_regnum (gdbarch)->fp0 && regno <= mips_regnum (gdbarch)->fp0 + 32) is_fp = 1; else if (regno == mips_regnum (gdbarch)->fp_control_status) is_fp = 1; else if (regno == mips_regnum (gdbarch)->fp_implementation_revision) is_fp = 1; else is_fp = 0; tid = ptid_get_lwp (inferior_ptid); if (tid == 0) tid = ptid_get_pid (inferior_ptid); if (regno == -1 || !is_fp) { mips64_elf_gregset_t regs; if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1) perror_with_name (_("Couldn't get registers")); mips64_fill_gregset (regcache, ®s, regno); if (ptrace (PTRACE_SETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1) perror_with_name (_("Couldn't set registers")); } if (regno == -1 || is_fp) { mips64_elf_fpregset_t fp_regs; if (ptrace (PTRACE_GETFPREGS, tid, 0L, (PTRACE_TYPE_ARG3) &fp_regs) == -1) perror_with_name (_("Couldn't get FP registers")); mips64_fill_fpregset (regcache, &fp_regs, regno); if (ptrace (PTRACE_SETFPREGS, tid, 0L, (PTRACE_TYPE_ARG3) &fp_regs) == -1) perror_with_name (_("Couldn't set FP registers")); } } /* Fetch REGNO (or all registers if REGNO == -1) from the target using any working method. */ static void mips64_linux_fetch_registers (struct target_ops *ops, struct regcache *regcache, int regnum) { /* Unless we already know that PTRACE_GETREGS does not work, try it. */ if (have_ptrace_regsets) mips64_linux_regsets_fetch_registers (regcache, regnum); /* If we know, or just found out, that PTRACE_GETREGS does not work, fall back to PTRACE_PEEKUSER. */ if (!have_ptrace_regsets) super_fetch_registers (regcache, regnum); } /* Store REGNO (or all registers if REGNO == -1) to the target using any working method. */ static void mips64_linux_store_registers (struct target_ops *ops, struct regcache *regcache, int regnum) { /* Unless we already know that PTRACE_GETREGS does not work, try it. */ if (have_ptrace_regsets) mips64_linux_regsets_store_registers (regcache, regnum); /* If we know, or just found out, that PTRACE_GETREGS does not work, fall back to PTRACE_PEEKUSER. */ if (!have_ptrace_regsets) super_store_registers (regcache, regnum); } /* Return the address in the core dump or inferior of register REGNO. */ static CORE_ADDR mips_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p) { if (mips_abi_regsize (gdbarch) == 8) return mips64_linux_register_addr (gdbarch, regno, store_p); else return mips_linux_register_addr (gdbarch, regno, store_p); } static const struct target_desc * mips_linux_read_description (struct target_ops *ops) { /* Report that target registers are a size we know for sure that we can get from ptrace. */ if (_MIPS_SIM == _ABIO32) return tdesc_mips_linux; else return tdesc_mips64_linux; } void _initialize_mips_linux_nat (void); void _initialize_mips_linux_nat (void) { struct target_ops *t = linux_trad_target (mips_linux_register_u_offset); super_fetch_registers = t->to_fetch_registers; super_store_registers = t->to_store_registers; t->to_fetch_registers = mips64_linux_fetch_registers; t->to_store_registers = mips64_linux_store_registers; t->to_read_description = mips_linux_read_description; linux_nat_add_target (t); /* Initialize the standard target descriptions. */ initialize_tdesc_mips_linux (); initialize_tdesc_mips64_linux (); }