| /* Target-dependent code for OpenBSD/powerpc. |
| |
| Copyright 2004, 2005 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 "defs.h" |
| #include "arch-utils.h" |
| #include "floatformat.h" |
| #include "osabi.h" |
| #include "regcache.h" |
| #include "regset.h" |
| #include "trad-frame.h" |
| #include "tramp-frame.h" |
| |
| #include "gdb_assert.h" |
| #include "gdb_string.h" |
| |
| #include "ppc-tdep.h" |
| #include "ppcobsd-tdep.h" |
| #include "solib-svr4.h" |
| |
| /* Register offsets from <machine/reg.h>. */ |
| struct ppc_reg_offsets ppcobsd_reg_offsets; |
| |
| |
| /* Core file support. */ |
| |
| /* Supply register REGNUM in the general-purpose register set REGSET |
| from the buffer specified by GREGS and LEN to register cache |
| REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ |
| |
| void |
| ppcobsd_supply_gregset (const struct regset *regset, |
| struct regcache *regcache, int regnum, |
| const void *gregs, size_t len) |
| { |
| /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating |
| point registers. Traditionally, GDB's register set has still |
| listed the floating point registers for such machines, so this |
| code is harmless. However, the new E500 port actually omits the |
| floating point registers entirely from the register set --- they |
| don't even have register numbers assigned to them. |
| |
| It's not clear to me how best to update this code, so this assert |
| will alert the first person to encounter the OpenBSD/E500 |
| combination to the problem. */ |
| gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); |
| |
| ppc_supply_gregset (regset, regcache, regnum, gregs, len); |
| ppc_supply_fpregset (regset, regcache, regnum, gregs, len); |
| } |
| |
| /* Collect register REGNUM in the general-purpose register set |
| REGSET. from register cache REGCACHE into the buffer specified by |
| GREGS and LEN. If REGNUM is -1, do this for all registers in |
| REGSET. */ |
| |
| void |
| ppcobsd_collect_gregset (const struct regset *regset, |
| const struct regcache *regcache, int regnum, |
| void *gregs, size_t len) |
| { |
| /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating |
| point registers. Traditionally, GDB's register set has still |
| listed the floating point registers for such machines, so this |
| code is harmless. However, the new E500 port actually omits the |
| floating point registers entirely from the register set --- they |
| don't even have register numbers assigned to them. |
| |
| It's not clear to me how best to update this code, so this assert |
| will alert the first person to encounter the OpenBSD/E500 |
| combination to the problem. */ |
| gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); |
| |
| ppc_collect_gregset (regset, regcache, regnum, gregs, len); |
| ppc_collect_fpregset (regset, regcache, regnum, gregs, len); |
| } |
| |
| /* OpenBSD/powerpc register set. */ |
| |
| struct regset ppcobsd_gregset = |
| { |
| &ppcobsd_reg_offsets, |
| ppcobsd_supply_gregset |
| }; |
| |
| /* Return the appropriate register set for the core section identified |
| by SECT_NAME and SECT_SIZE. */ |
| |
| static const struct regset * |
| ppcobsd_regset_from_core_section (struct gdbarch *gdbarch, |
| const char *sect_name, size_t sect_size) |
| { |
| if (strcmp (sect_name, ".reg") == 0 && sect_size >= 412) |
| return &ppcobsd_gregset; |
| |
| return NULL; |
| } |
| |
| |
| /* Signal trampolines. */ |
| |
| static void |
| ppcobsd_sigtramp_cache_init (const struct tramp_frame *self, |
| struct frame_info *next_frame, |
| struct trad_frame_cache *this_cache, |
| CORE_ADDR func) |
| { |
| struct gdbarch *gdbarch = get_frame_arch (next_frame); |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| CORE_ADDR addr, base; |
| int i; |
| |
| base = frame_unwind_register_unsigned (next_frame, SP_REGNUM); |
| addr = base + 0x18 + 2 * tdep->wordsize; |
| for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize) |
| { |
| int regnum = i + tdep->ppc_gp0_regnum; |
| trad_frame_set_reg_addr (this_cache, regnum, addr); |
| } |
| trad_frame_set_reg_addr (this_cache, tdep->ppc_lr_regnum, addr); |
| addr += tdep->wordsize; |
| trad_frame_set_reg_addr (this_cache, tdep->ppc_cr_regnum, addr); |
| addr += tdep->wordsize; |
| trad_frame_set_reg_addr (this_cache, tdep->ppc_xer_regnum, addr); |
| addr += tdep->wordsize; |
| trad_frame_set_reg_addr (this_cache, tdep->ppc_ctr_regnum, addr); |
| addr += tdep->wordsize; |
| trad_frame_set_reg_addr (this_cache, PC_REGNUM, addr); /* SRR0? */ |
| addr += tdep->wordsize; |
| |
| /* Construct the frame ID using the function start. */ |
| trad_frame_set_id (this_cache, frame_id_build (base, func)); |
| } |
| |
| static const struct tramp_frame ppcobsd_sigtramp = |
| { |
| SIGTRAMP_FRAME, |
| 4, |
| { |
| { 0x3821fff0, -1 }, /* add r1,r1,-16 */ |
| { 0x4e800021, -1 }, /* blrl */ |
| { 0x38610018, -1 }, /* addi r3,r1,24 */ |
| { 0x38000067, -1 }, /* li r0,103 */ |
| { 0x44000002, -1 }, /* sc */ |
| { 0x38000001, -1 }, /* li r0,1 */ |
| { 0x44000002, -1 }, /* sc */ |
| { TRAMP_SENTINEL_INSN, -1 } |
| }, |
| ppcobsd_sigtramp_cache_init |
| }; |
| |
| |
| static void |
| ppcobsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| /* OpenBSD doesn't support the 128-bit `long double' from the psABI. */ |
| set_gdbarch_long_double_bit (gdbarch, 64); |
| set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big); |
| |
| /* OpenBSD currently uses a broken GCC. */ |
| set_gdbarch_return_value (gdbarch, ppc_sysv_abi_broken_return_value); |
| |
| /* OpenBSD uses SVR4-style shared libraries. */ |
| set_solib_svr4_fetch_link_map_offsets |
| (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| |
| set_gdbarch_regset_from_core_section |
| (gdbarch, ppcobsd_regset_from_core_section); |
| |
| tramp_frame_prepend_unwinder (gdbarch, &ppcobsd_sigtramp); |
| } |
| |
| |
| /* OpenBSD uses uses the traditional NetBSD core file format, even for |
| ports that use ELF. */ |
| #define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF |
| |
| static enum gdb_osabi |
| ppcobsd_core_osabi_sniffer (bfd *abfd) |
| { |
| if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) |
| return GDB_OSABI_NETBSD_CORE; |
| |
| return GDB_OSABI_UNKNOWN; |
| } |
| |
| |
| /* Provide a prototype to silence -Wmissing-prototypes. */ |
| void _initialize_ppcobsd_tdep (void); |
| |
| void |
| _initialize_ppcobsd_tdep (void) |
| { |
| /* BFD doesn't set a flavour for NetBSD style a.out core files. */ |
| gdbarch_register_osabi_sniffer (bfd_arch_powerpc, bfd_target_unknown_flavour, |
| ppcobsd_core_osabi_sniffer); |
| |
| gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_OPENBSD_ELF, |
| ppcobsd_init_abi); |
| gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_OPENBSD_ELF, |
| ppcobsd_init_abi); |
| |
| /* Avoid initializing the register offsets again if they were |
| already initailized by ppcobsd-nat.c. */ |
| if (ppcobsd_reg_offsets.pc_offset == 0) |
| { |
| /* General-purpose registers. */ |
| ppcobsd_reg_offsets.r0_offset = 0; |
| ppcobsd_reg_offsets.pc_offset = 384; |
| ppcobsd_reg_offsets.ps_offset = 388; |
| ppcobsd_reg_offsets.cr_offset = 392; |
| ppcobsd_reg_offsets.lr_offset = 396; |
| ppcobsd_reg_offsets.ctr_offset = 400; |
| ppcobsd_reg_offsets.xer_offset = 404; |
| ppcobsd_reg_offsets.mq_offset = 408; |
| |
| /* Floating-point registers. */ |
| ppcobsd_reg_offsets.f0_offset = 128; |
| ppcobsd_reg_offsets.fpscr_offset = -1; |
| |
| /* AltiVec registers. */ |
| ppcobsd_reg_offsets.vr0_offset = 0; |
| ppcobsd_reg_offsets.vscr_offset = 512; |
| ppcobsd_reg_offsets.vrsave_offset = 520; |
| } |
| } |