/* Native-dependent code for GNU/Linux m32r. Copyright (C) 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 <http://www.gnu.org/licenses/>. */ #include "defs.h" #include "inferior.h" #include "gdbcore.h" #include "regcache.h" #include "linux-nat.h" #include "target.h" #include "gdb_assert.h" #include "gdb_string.h" #include <sys/ptrace.h> #include <sys/user.h> #include <sys/procfs.h> /* Prototypes for supply_gregset etc. */ #include "gregset.h" #include "m32r-tdep.h" /* Since EVB register is not available for native debug, we reduce the number of registers. */ #define M32R_LINUX_NUM_REGS (M32R_NUM_REGS - 1) /* Mapping between the general-purpose registers in `struct user' format and GDB's register array layout. */ static int regmap[] = { 4, 5, 6, 7, 0, 1, 2, 8, 9, 10, 11, 12, 13, 24, 25, 23, 19, 19, 26, 23, 22, 20, 16, 15 }; #define PSW_REGMAP 19 #define BBPSW_REGMAP 21 #define SPU_REGMAP 23 #define SPI_REGMAP 26 /* Doee apply to the corresponding SET requests as well. */ #define GETREGS_SUPPLIES(regno) (0 <= (regno) && (regno) <= M32R_LINUX_NUM_REGS) /* Transfering the general-purpose registers between GDB, inferiors and core files. */ /* Fill GDB's register array with the general-purpose register values in *GREGSETP. */ void supply_gregset (struct regcache *regcache, const elf_gregset_t * gregsetp) { const elf_greg_t *regp = (const elf_greg_t *) gregsetp; int i; unsigned long psw, bbpsw; psw = *(regp + PSW_REGMAP); bbpsw = *(regp + BBPSW_REGMAP); for (i = 0; i < M32R_LINUX_NUM_REGS; i++) { elf_greg_t regval; switch (i) { case PSW_REGNUM: regval = ((0x00c1 & bbpsw) << 8) | ((0xc100 & psw) >> 8); break; case CBR_REGNUM: regval = ((psw >> 8) & 1); break; default: regval = *(regp + regmap[i]); break; } if (i != M32R_SP_REGNUM) regcache_raw_supply (regcache, i, ®val); else if (psw & 0x8000) regcache_raw_supply (regcache, i, regp + SPU_REGMAP); else regcache_raw_supply (regcache, i, regp + SPI_REGMAP); } } /* Fetch all general-purpose registers from process/thread TID and store their values in GDB's register array. */ static void fetch_regs (struct regcache *regcache, int tid) { elf_gregset_t regs; if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) perror_with_name (_("Couldn't get registers")); supply_gregset (regcache, (const elf_gregset_t *) ®s); } /* Fill register REGNO (if it is a general-purpose register) in *GREGSETPS with the value in GDB's register array. If REGNO is -1, do this for all registers. */ void fill_gregset (const struct regcache *regcache, elf_gregset_t * gregsetp, int regno) { elf_greg_t *regp = (elf_greg_t *) gregsetp; int i; unsigned long psw, bbpsw, tmp; psw = *(regp + PSW_REGMAP); bbpsw = *(regp + BBPSW_REGMAP); for (i = 0; i < M32R_LINUX_NUM_REGS; i++) { if (regno != -1 && regno != i) continue; if (i == CBR_REGNUM || i == PSW_REGNUM) continue; if (i == SPU_REGNUM || i == SPI_REGNUM) continue; if (i != M32R_SP_REGNUM) regcache_raw_collect (regcache, i, regp + regmap[i]); else if (psw & 0x8000) regcache_raw_collect (regcache, i, regp + SPU_REGMAP); else regcache_raw_collect (regcache, i, regp + SPI_REGMAP); } } /* Store all valid general-purpose registers in GDB's register array into the process/thread specified by TID. */ static void store_regs (const struct regcache *regcache, int tid, int regno) { elf_gregset_t regs; if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) perror_with_name (_("Couldn't get registers")); fill_gregset (regcache, ®s, regno); if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) perror_with_name (_("Couldn't write registers")); } /* Transfering floating-point registers between GDB, inferiors and cores. Since M32R has no floating-point registers, these functions do nothing. */ void supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs) { } void fill_fpregset (const struct regcache *regcache, gdb_fpregset_t *fpregs, int regno) { } /* Transferring arbitrary registers between GDB and inferior. */ /* Fetch register REGNO from the child process. If REGNO is -1, do this for all registers (including the floating point and SSE registers). */ static void m32r_linux_fetch_inferior_registers (struct target_ops *ops, struct regcache *regcache, int regno) { int tid; /* GNU/Linux LWP ID's are process ID's. */ tid = TIDGET (inferior_ptid); if (tid == 0) tid = PIDGET (inferior_ptid); /* Not a threaded program. */ /* Use the PTRACE_GETREGS request whenever possible, since it transfers more registers in one system call, and we'll cache the results. */ if (regno == -1 || GETREGS_SUPPLIES (regno)) { fetch_regs (regcache, tid); return; } internal_error (__FILE__, __LINE__, _("Got request for bad register number %d."), regno); } /* Store register REGNO back into the child process. If REGNO is -1, do this for all registers (including the floating point and SSE registers). */ static void m32r_linux_store_inferior_registers (struct target_ops *ops, struct regcache *regcache, int regno) { int tid; /* GNU/Linux LWP ID's are process ID's. */ if ((tid = TIDGET (inferior_ptid)) == 0) tid = PIDGET (inferior_ptid); /* Not a threaded program. */ /* Use the PTRACE_SETREGS request whenever possible, since it transfers more registers in one system call. */ if (regno == -1 || GETREGS_SUPPLIES (regno)) { store_regs (regcache, tid, regno); return; } internal_error (__FILE__, __LINE__, _("Got request to store bad register number %d."), regno); } void _initialize_m32r_linux_nat (void); void _initialize_m32r_linux_nat (void) { struct target_ops *t; /* Fill in the generic GNU/Linux methods. */ t = linux_target (); /* Add our register access methods. */ t->to_fetch_registers = m32r_linux_fetch_inferior_registers; t->to_store_registers = m32r_linux_store_inferior_registers; /* Register the target. */ linux_nat_add_target (t); }