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- /* Target-dependent code for NetBSD/powerpc.
- Copyright (C) 2002-2022 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 "defs.h"
- #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)
- && !((TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 8)
- && valtype->is_vector ())
- && !(TYPE_LENGTH (valtype) == 1
- || TYPE_LENGTH (valtype) == 2
- || TYPE_LENGTH (valtype) == 4
- || TYPE_LENGTH (valtype) == 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,
- struct frame_info *this_frame,
- struct trad_frame_cache *this_cache,
- CORE_ADDR func)
- {
- struct gdbarch *gdbarch = get_frame_arch (this_frame);
- ppc_gdbarch_tdep *tdep = (ppc_gdbarch_tdep *) 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;
- }
- }
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