| /* Target-dependent code for NetBSD/powerpc. |
| |
| Copyright (C) 2002-2024 Free Software Foundation, Inc. |
| |
| Contributed by Wasabi Systems, 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 "gdbtypes.h" |
| #include "osabi.h" |
| #include "regcache.h" |
| #include "regset.h" |
| #include "trad-frame.h" |
| #include "tramp-frame.h" |
| |
| #include "ppc-tdep.h" |
| #include "netbsd-tdep.h" |
| #include "ppc-tdep.h" |
| #include "solib-svr4.h" |
| |
| /* Register offsets from <machine/reg.h>. */ |
| static ppc_reg_offsets ppcnbsd_reg_offsets; |
| |
| |
| /* Core file support. */ |
| |
| /* NetBSD/powerpc register sets. */ |
| |
| const struct regset ppcnbsd_gregset = |
| { |
| &ppcnbsd_reg_offsets, |
| ppc_supply_gregset |
| }; |
| |
| const struct regset ppcnbsd_fpregset = |
| { |
| &ppcnbsd_reg_offsets, |
| ppc_supply_fpregset |
| }; |
| |
| /* Iterate over core file register note sections. */ |
| |
| static void |
| ppcnbsd_iterate_over_regset_sections (struct gdbarch *gdbarch, |
| iterate_over_regset_sections_cb *cb, |
| void *cb_data, |
| const struct regcache *regcache) |
| { |
| cb (".reg", 148, 148, &ppcnbsd_gregset, NULL, cb_data); |
| cb (".reg2", 264, 264, &ppcnbsd_fpregset, NULL, cb_data); |
| } |
| |
| |
| /* NetBSD is confused. It appears that 1.5 was using the correct SVR4 |
| convention but, 1.6 switched to the below broken convention. For |
| the moment use the broken convention. Ulgh! */ |
| |
| static enum return_value_convention |
| ppcnbsd_return_value (struct gdbarch *gdbarch, struct value *function, |
| struct type *valtype, struct regcache *regcache, |
| gdb_byte *readbuf, const gdb_byte *writebuf) |
| { |
| #if 0 |
| if ((valtype->code () == TYPE_CODE_STRUCT |
| || valtype->code () == TYPE_CODE_UNION) |
| && !((valtype->length () == 16 || valtype->length () == 8) |
| && valtype->is_vector ()) |
| && !(valtype->length () == 1 |
| || valtype->length () == 2 |
| || valtype->length () == 4 |
| || valtype->length () == 8)) |
| return RETURN_VALUE_STRUCT_CONVENTION; |
| else |
| #endif |
| return ppc_sysv_abi_broken_return_value (gdbarch, function, valtype, |
| regcache, readbuf, writebuf); |
| } |
| |
| |
| /* Signal trampolines. */ |
| |
| extern const struct tramp_frame ppcnbsd2_sigtramp; |
| |
| static void |
| ppcnbsd_sigtramp_cache_init (const struct tramp_frame *self, |
| const frame_info_ptr &this_frame, |
| struct trad_frame_cache *this_cache, |
| CORE_ADDR func) |
| { |
| struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| ppc_gdbarch_tdep *tdep = gdbarch_tdep<ppc_gdbarch_tdep> (gdbarch); |
| CORE_ADDR addr, base; |
| int i; |
| |
| base = get_frame_register_unsigned (this_frame, |
| gdbarch_sp_regnum (gdbarch)); |
| if (self == &ppcnbsd2_sigtramp) |
| addr = base + 0x10 + 2 * tdep->wordsize; |
| else |
| 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, gdbarch_pc_regnum (gdbarch), |
| 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 ppcnbsd_sigtramp = |
| { |
| SIGTRAMP_FRAME, |
| 4, |
| { |
| { 0x3821fff0, ULONGEST_MAX }, /* add r1,r1,-16 */ |
| { 0x4e800021, ULONGEST_MAX }, /* blrl */ |
| { 0x38610018, ULONGEST_MAX }, /* addi r3,r1,24 */ |
| { 0x38000127, ULONGEST_MAX }, /* li r0,295 */ |
| { 0x44000002, ULONGEST_MAX }, /* sc */ |
| { 0x38000001, ULONGEST_MAX }, /* li r0,1 */ |
| { 0x44000002, ULONGEST_MAX }, /* sc */ |
| { TRAMP_SENTINEL_INSN, ULONGEST_MAX } |
| }, |
| ppcnbsd_sigtramp_cache_init |
| }; |
| |
| /* NetBSD 2.0 introduced a slightly different signal trampoline. */ |
| |
| const struct tramp_frame ppcnbsd2_sigtramp = |
| { |
| SIGTRAMP_FRAME, |
| 4, |
| { |
| { 0x3821fff0, ULONGEST_MAX }, /* add r1,r1,-16 */ |
| { 0x4e800021, ULONGEST_MAX }, /* blrl */ |
| { 0x38610010, ULONGEST_MAX }, /* addi r3,r1,16 */ |
| { 0x38000127, ULONGEST_MAX }, /* li r0,295 */ |
| { 0x44000002, ULONGEST_MAX }, /* sc */ |
| { 0x38000001, ULONGEST_MAX }, /* li r0,1 */ |
| { 0x44000002, ULONGEST_MAX }, /* sc */ |
| { TRAMP_SENTINEL_INSN, ULONGEST_MAX } |
| }, |
| ppcnbsd_sigtramp_cache_init |
| }; |
| |
| |
| static void |
| ppcnbsd_init_abi (struct gdbarch_info info, |
| struct gdbarch *gdbarch) |
| { |
| nbsd_init_abi (info, gdbarch); |
| |
| /* For NetBSD, this is an on again, off again thing. Some systems |
| do use the broken struct convention, and some don't. */ |
| set_gdbarch_return_value (gdbarch, ppcnbsd_return_value); |
| |
| /* NetBSD uses SVR4-style shared libraries. */ |
| set_solib_svr4_fetch_link_map_offsets |
| (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| |
| set_gdbarch_iterate_over_regset_sections |
| (gdbarch, ppcnbsd_iterate_over_regset_sections); |
| |
| tramp_frame_prepend_unwinder (gdbarch, &ppcnbsd_sigtramp); |
| tramp_frame_prepend_unwinder (gdbarch, &ppcnbsd2_sigtramp); |
| } |
| |
| void _initialize_ppcnbsd_tdep (); |
| void |
| _initialize_ppcnbsd_tdep () |
| { |
| gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_NETBSD, |
| ppcnbsd_init_abi); |
| |
| /* Avoid initializing the register offsets again if they were |
| already initialized by ppc-netbsd-nat.c. */ |
| if (ppcnbsd_reg_offsets.pc_offset == 0) |
| { |
| /* General-purpose registers. */ |
| ppcnbsd_reg_offsets.r0_offset = 0; |
| ppcnbsd_reg_offsets.gpr_size = 4; |
| ppcnbsd_reg_offsets.xr_size = 4; |
| ppcnbsd_reg_offsets.lr_offset = 128; |
| ppcnbsd_reg_offsets.cr_offset = 132; |
| ppcnbsd_reg_offsets.xer_offset = 136; |
| ppcnbsd_reg_offsets.ctr_offset = 140; |
| ppcnbsd_reg_offsets.pc_offset = 144; |
| ppcnbsd_reg_offsets.ps_offset = -1; |
| ppcnbsd_reg_offsets.mq_offset = -1; |
| |
| /* Floating-point registers. */ |
| ppcnbsd_reg_offsets.f0_offset = 0; |
| ppcnbsd_reg_offsets.fpscr_offset = 256; |
| ppcnbsd_reg_offsets.fpscr_size = 4; |
| |
| } |
| } |