diff options
Diffstat (limited to 'gnu/usr.bin/gdb/gdbserver/fbsd-ppc-low.c')
-rw-r--r-- | gnu/usr.bin/gdb/gdbserver/fbsd-ppc-low.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/gnu/usr.bin/gdb/gdbserver/fbsd-ppc-low.c b/gnu/usr.bin/gdb/gdbserver/fbsd-ppc-low.c new file mode 100644 index 0000000..35f7ac6 --- /dev/null +++ b/gnu/usr.bin/gdb/gdbserver/fbsd-ppc-low.c @@ -0,0 +1,156 @@ +/* FreeBSD/PowerPC specific low level interface, for the remote server for + GDB. + Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002 + 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 + (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, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "server.h" +#include "fbsd-low.h" + +#include <sys/procfs.h> +#include <sys/ptrace.h> + +#define ppc_num_regs 71 + +/* Currently, don't check/send MQ. */ +static int ppc_regmap[] = + { 0, 4, 8, 12, 16, 20, 24, 28, + 32, 36, 40, 44, 48, 52, 56, 60, + 64, 68, 72, 76, 80, 84, 88, 92, + 96, 100, 104, 108, 112, 116, 120, 124, +#if 0 + /* + * XXX on FreeBSD the gdbserver for PowerPC was only tested with FPU-less + * cores i.e. e500. Let's leave the original FPR references around in case + * someone picks up and brings support for AIM-like FPU machines. + */ + PT_FPR0*4, PT_FPR0*4 + 8, PT_FPR0*4+16, PT_FPR0*4+24, + PT_FPR0*4+32, PT_FPR0*4+40, PT_FPR0*4+48, PT_FPR0*4+56, + PT_FPR0*4+64, PT_FPR0*4+72, PT_FPR0*4+80, PT_FPR0*4+88, + PT_FPR0*4+96, PT_FPR0*4+104, PT_FPR0*4+112, PT_FPR0*4+120, + PT_FPR0*4+128, PT_FPR0*4+136, PT_FPR0*4+144, PT_FPR0*4+152, + PT_FPR0*4+160, PT_FPR0*4+168, PT_FPR0*4+176, PT_FPR0*4+184, + PT_FPR0*4+192, PT_FPR0*4+200, PT_FPR0*4+208, PT_FPR0*4+216, + PT_FPR0*4+224, PT_FPR0*4+232, PT_FPR0*4+240, PT_FPR0*4+248, +#endif + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, + 144, -1, 132, 128, 140, 136, -1 + }; + +static int +ppc_cannot_store_register (int regno) +{ + /* Some kernels do not allow us to store fpscr. */ + if (regno == find_regno ("fpscr")) + return 2; + + return 0; +} + +static int +ppc_cannot_fetch_register (int regno) +{ + return 0; +} + +static CORE_ADDR +ppc_get_pc (void) +{ + unsigned long pc; + + collect_register_by_name ("pc", &pc); + return (CORE_ADDR) pc; +} + +static void +ppc_set_pc (CORE_ADDR pc) +{ + unsigned long newpc = pc; + + supply_register_by_name ("pc", &newpc); +} + +/* Correct in either endianness. Note that this file is + for PowerPC only, not PowerPC64. + This instruction is "twge r2, r2", which GDB uses as a software + breakpoint. */ +static const unsigned long ppc_breakpoint = 0x7d821008; +#define ppc_breakpoint_len 4 + +static int +ppc_breakpoint_at (CORE_ADDR where) +{ + unsigned long insn; + + (*the_target->read_memory) (where, (char *) &insn, 4); + if (insn == ppc_breakpoint) + return 1; + /* If necessary, recognize more trap instructions here. GDB only uses the + one. */ + return 0; +} + +static void +ppc_fill_gregset (void *buf) +{ + int i; + + for (i = 0; i < ppc_num_regs; i++) + if (ppc_regmap[i] != -1) + collect_register (i, ((char *) buf) + ppc_regmap[i]); + +} + +static void +ppc_store_gregset (const void *buf) +{ + int i; + + for (i = 0; i < ppc_num_regs; i++) + if (ppc_regmap[i] != -1) + supply_register (i, ((char *) buf) + ppc_regmap[i]); + +} + +struct regset_info target_regsets[] = { + { PT_GETREGS, PT_SETREGS, sizeof (struct reg), + GENERAL_REGS, + ppc_fill_gregset, ppc_store_gregset }, + { 0, 0, -1, -1, NULL, NULL } +}; + +struct fbsd_target_ops the_low_target = { + ppc_num_regs, + ppc_regmap, + ppc_cannot_fetch_register, + ppc_cannot_store_register, + ppc_get_pc, + ppc_set_pc, + (const char *) &ppc_breakpoint, + ppc_breakpoint_len, + NULL, + 0, + ppc_breakpoint_at, +}; |