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- /* Target-dependent code for PowerPC systems running FreeBSD.
- Copyright (C) 2013-2022 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 "arch-utils.h"
- #include "frame.h"
- #include "gdbcore.h"
- #include "frame-unwind.h"
- #include "gdbtypes.h"
- #include "osabi.h"
- #include "regcache.h"
- #include "regset.h"
- #include "symtab.h"
- #include "target.h"
- #include "trad-frame.h"
- #include "ppc-tdep.h"
- #include "ppc64-tdep.h"
- #include "ppc-fbsd-tdep.h"
- #include "fbsd-tdep.h"
- #include "solib-svr4.h"
- #include "inferior.h"
- /* 32-bit regset descriptions. */
- static const struct ppc_reg_offsets ppc32_fbsd_reg_offsets =
- {
- /* General-purpose registers. */
- /* .r0_offset = */ 0,
- /* .gpr_size = */ 4,
- /* .xr_size = */ 4,
- /* .pc_offset = */ 144,
- /* .ps_offset = */ -1,
- /* .cr_offset = */ 132,
- /* .lr_offset = */ 128,
- /* .ctr_offset = */ 140,
- /* .xer_offset = */ 136,
- /* .mq_offset = */ -1,
- /* Floating-point registers. */
- /* .f0_offset = */ 0,
- /* .fpscr_offset = */ 256,
- /* .fpscr_size = */ 8
- };
- /* 64-bit regset descriptions. */
- static const struct ppc_reg_offsets ppc64_fbsd_reg_offsets =
- {
- /* General-purpose registers. */
- /* .r0_offset = */ 0,
- /* .gpr_size = */ 8,
- /* .xr_size = */ 8,
- /* .pc_offset = */ 288,
- /* .ps_offset = */ -1,
- /* .cr_offset = */ 264,
- /* .lr_offset = */ 256,
- /* .ctr_offset = */ 280,
- /* .xer_offset = */ 272,
- /* .mq_offset = */ -1,
- /* Floating-point registers. */
- /* .f0_offset = */ 0,
- /* .fpscr_offset = */ 256,
- /* .fpscr_size = */ 8
- };
- /* 32-bit general-purpose register set. */
- static const struct regset ppc32_fbsd_gregset = {
- &ppc32_fbsd_reg_offsets,
- ppc_supply_gregset,
- ppc_collect_gregset
- };
- /* 64-bit general-purpose register set. */
- static const struct regset ppc64_fbsd_gregset = {
- &ppc64_fbsd_reg_offsets,
- ppc_supply_gregset,
- ppc_collect_gregset
- };
- /* 32-/64-bit floating-point register set. */
- static const struct regset ppc32_fbsd_fpregset = {
- &ppc32_fbsd_reg_offsets,
- ppc_supply_fpregset,
- ppc_collect_fpregset
- };
- const struct regset *
- ppc_fbsd_gregset (int wordsize)
- {
- return wordsize == 8 ? &ppc64_fbsd_gregset : &ppc32_fbsd_gregset;
- }
- const struct regset *
- ppc_fbsd_fpregset (void)
- {
- return &ppc32_fbsd_fpregset;
- }
- /* Iterate over core file register note sections. */
- static void
- ppcfbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
- iterate_over_regset_sections_cb *cb,
- void *cb_data,
- const struct regcache *regcache)
- {
- ppc_gdbarch_tdep *tdep = (ppc_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- if (tdep->wordsize == 4)
- cb (".reg", 148, 148, &ppc32_fbsd_gregset, NULL, cb_data);
- else
- cb (".reg", 296, 296, &ppc64_fbsd_gregset, NULL, cb_data);
- cb (".reg2", 264, 264, &ppc32_fbsd_fpregset, NULL, cb_data);
- }
- /* Default page size. */
- static const int ppcfbsd_page_size = 4096;
- /* Offset for sigreturn(2). */
- static const int ppcfbsd_sigreturn_offset[] = {
- 0xc, /* FreeBSD 32-bit */
- -1
- };
- /* Signal trampolines. */
- static int
- ppcfbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
- struct frame_info *this_frame,
- void **this_cache)
- {
- struct gdbarch *gdbarch = get_frame_arch (this_frame);
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- CORE_ADDR pc = get_frame_pc (this_frame);
- CORE_ADDR start_pc = (pc & ~(ppcfbsd_page_size - 1));
- const int *offset;
- const char *name;
- /* A stack trampoline is detected if no name is associated
- to the current pc and if it points inside a trampoline
- sequence. */
- find_pc_partial_function (pc, &name, NULL, NULL);
- /* If we have a name, we have no trampoline, return. */
- if (name)
- return 0;
- for (offset = ppcfbsd_sigreturn_offset; *offset != -1; offset++)
- {
- gdb_byte buf[2 * PPC_INSN_SIZE];
- unsigned long insn;
- if (!safe_frame_unwind_memory (this_frame, start_pc + *offset,
- {buf, sizeof buf}))
- continue;
- /* Check for "li r0,SYS_sigreturn". */
- insn = extract_unsigned_integer (buf, PPC_INSN_SIZE, byte_order);
- if (insn != 0x380001a1)
- continue;
- /* Check for "sc". */
- insn = extract_unsigned_integer (buf + PPC_INSN_SIZE,
- PPC_INSN_SIZE, byte_order);
- if (insn != 0x44000002)
- continue;
- return 1;
- }
- return 0;
- }
- static struct trad_frame_cache *
- ppcfbsd_sigtramp_frame_cache (struct frame_info *this_frame, void **this_cache)
- {
- struct gdbarch *gdbarch = get_frame_arch (this_frame);
- ppc_gdbarch_tdep *tdep = (ppc_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- struct trad_frame_cache *cache;
- CORE_ADDR addr, base, func;
- gdb_byte buf[PPC_INSN_SIZE];
- int i;
- if (*this_cache)
- return (struct trad_frame_cache *) *this_cache;
- cache = trad_frame_cache_zalloc (this_frame);
- *this_cache = cache;
- func = get_frame_pc (this_frame);
- func &= ~(ppcfbsd_page_size - 1);
- if (!safe_frame_unwind_memory (this_frame, func, {buf, sizeof buf}))
- return cache;
- base = get_frame_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch));
- addr = base + 0x10 + 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 (cache, regnum, addr);
- }
- trad_frame_set_reg_addr (cache, tdep->ppc_lr_regnum, addr);
- addr += tdep->wordsize;
- trad_frame_set_reg_addr (cache, tdep->ppc_cr_regnum, addr);
- addr += tdep->wordsize;
- trad_frame_set_reg_addr (cache, tdep->ppc_xer_regnum, addr);
- addr += tdep->wordsize;
- trad_frame_set_reg_addr (cache, tdep->ppc_ctr_regnum, addr);
- addr += tdep->wordsize;
- trad_frame_set_reg_addr (cache, gdbarch_pc_regnum (gdbarch), addr);
- /* SRR0? */
- addr += tdep->wordsize;
- /* Construct the frame ID using the function start. */
- trad_frame_set_id (cache, frame_id_build (base, func));
- return cache;
- }
- static void
- ppcfbsd_sigtramp_frame_this_id (struct frame_info *this_frame,
- void **this_cache, struct frame_id *this_id)
- {
- struct trad_frame_cache *cache =
- ppcfbsd_sigtramp_frame_cache (this_frame, this_cache);
- trad_frame_get_id (cache, this_id);
- }
- static struct value *
- ppcfbsd_sigtramp_frame_prev_register (struct frame_info *this_frame,
- void **this_cache, int regnum)
- {
- struct trad_frame_cache *cache =
- ppcfbsd_sigtramp_frame_cache (this_frame, this_cache);
- return trad_frame_get_register (cache, this_frame, regnum);
- }
- static const struct frame_unwind ppcfbsd_sigtramp_frame_unwind = {
- "ppc freebsd sigtramp",
- SIGTRAMP_FRAME,
- default_frame_unwind_stop_reason,
- ppcfbsd_sigtramp_frame_this_id,
- ppcfbsd_sigtramp_frame_prev_register,
- NULL,
- ppcfbsd_sigtramp_frame_sniffer
- };
- static enum return_value_convention
- ppcfbsd_return_value (struct gdbarch *gdbarch, struct value *function,
- struct type *valtype, struct regcache *regcache,
- gdb_byte *readbuf, const gdb_byte *writebuf)
- {
- return ppc_sysv_abi_broken_return_value (gdbarch, function, valtype,
- regcache, readbuf, writebuf);
- }
- /* Implement the "get_thread_local_address" gdbarch method. */
- static CORE_ADDR
- ppcfbsd_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid,
- CORE_ADDR lm_addr, CORE_ADDR offset)
- {
- ppc_gdbarch_tdep *tdep = (ppc_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- struct regcache *regcache;
- int tp_offset, tp_regnum;
- regcache = get_thread_arch_regcache (current_inferior ()->process_target (),
- ptid, gdbarch);
- if (tdep->wordsize == 4)
- {
- tp_offset = 0x7008;
- tp_regnum = PPC_R0_REGNUM + 2;
- }
- else
- {
- tp_offset = 0x7010;
- tp_regnum = PPC_R0_REGNUM + 13;
- }
- target_fetch_registers (regcache, tp_regnum);
- ULONGEST tp;
- if (regcache->cooked_read (tp_regnum, &tp) != REG_VALID)
- error (_("Unable to fetch tcb pointer"));
- /* tp points to the end of the TCB block. The first member of the
- TCB is the pointer to the DTV array. */
- CORE_ADDR dtv_addr = tp - tp_offset;
- return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset);
- }
- static void
- ppcfbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
- {
- ppc_gdbarch_tdep *tdep = (ppc_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- /* Generic FreeBSD support. */
- fbsd_init_abi (info, gdbarch);
- /* FreeBSD doesn't support the 128-bit `long double' from the psABI. */
- set_gdbarch_long_double_bit (gdbarch, 64);
- set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
- if (tdep->wordsize == 4)
- {
- set_gdbarch_return_value (gdbarch, ppcfbsd_return_value);
- set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
- set_solib_svr4_fetch_link_map_offsets (gdbarch,
- svr4_ilp32_fetch_link_map_offsets);
- frame_unwind_append_unwinder (gdbarch, &ppcfbsd_sigtramp_frame_unwind);
- set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpc");
- }
- if (tdep->wordsize == 8)
- {
- set_gdbarch_convert_from_func_ptr_addr
- (gdbarch, ppc64_convert_from_func_ptr_addr);
- set_gdbarch_elf_make_msymbol_special (gdbarch,
- ppc64_elf_make_msymbol_special);
- set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code);
- set_solib_svr4_fetch_link_map_offsets (gdbarch,
- svr4_lp64_fetch_link_map_offsets);
- set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpc");
- }
- set_gdbarch_iterate_over_regset_sections
- (gdbarch, ppcfbsd_iterate_over_regset_sections);
- set_gdbarch_fetch_tls_load_module_address (gdbarch,
- svr4_fetch_objfile_link_map);
- set_gdbarch_get_thread_local_address (gdbarch,
- ppcfbsd_get_thread_local_address);
- }
- void _initialize_ppcfbsd_tdep ();
- void
- _initialize_ppcfbsd_tdep ()
- {
- gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc, GDB_OSABI_FREEBSD,
- ppcfbsd_init_abi);
- gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64, GDB_OSABI_FREEBSD,
- ppcfbsd_init_abi);
- gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_FREEBSD,
- ppcfbsd_init_abi);
- }
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