diff options
Diffstat (limited to 'gdb/ppcfbsd-tdep.c')
| -rw-r--r-- | gdb/ppcfbsd-tdep.c | 355 |
1 files changed, 355 insertions, 0 deletions
diff --git a/gdb/ppcfbsd-tdep.c b/gdb/ppcfbsd-tdep.c new file mode 100644 index 0000000..f18ed4f --- /dev/null +++ b/gdb/ppcfbsd-tdep.c @@ -0,0 +1,355 @@ +/* Target-dependent code for PowerPC systems running FreeBSD. + + Copyright (C) 2013 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 "gdb_assert.h" +#include "gdb_string.h" + +#include "ppc-tdep.h" +#include "ppc64-tdep.h" +#include "ppcfbsd-tdep.h" +#include "solib-svr4.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, +#ifdef NOTYET + /* AltiVec registers. */ + /* .vr0_offset = */ 0, + /* .vscr_offset = */ 512 + 12, + /* .vrsave_offset = */ 512 +#endif + }; + +/* 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, +#ifdef NOYET + /* AltiVec registers. */ + /* .vr0_offset = */ 0, + /* .vscr_offset = */ 512 + 12, + /* .vrsave_offset = */ 528 +#endif + }; + +/* 32-bit general-purpose register set. */ + +static const struct regset ppc32_fbsd_gregset = { + &ppc32_fbsd_reg_offsets, + ppc_supply_gregset, + ppc_collect_gregset, + NULL +}; + +/* 64-bit general-purpose register set. */ + +static const struct regset ppc64_fbsd_gregset = { + &ppc64_fbsd_reg_offsets, + ppc_supply_gregset, + ppc_collect_gregset, + NULL +}; + +/* 32-/64-bit floating-point register set. */ + +static 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; +} + +/* Return the appropriate register set for the core section identified + by SECT_NAME and SECT_SIZE. */ + +static const struct regset * +ppcfbsd_regset_from_core_section (struct gdbarch *gdbarch, + const char *sect_name, size_t sect_size) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + if (strcmp (sect_name, ".reg") == 0 && sect_size >= 148) + { + if (tdep->wordsize == 4) + return &ppc32_fbsd_gregset; + else + return &ppc64_fbsd_gregset; + } + if (strcmp (sect_name, ".reg2") == 0 && sect_size >= 264) + return &ppc32_fbsd_fpregset; + return NULL; +} + +/* 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); + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); + struct trad_frame_cache *cache; + CORE_ADDR addr, base, func; + gdb_byte buf[PPC_INSN_SIZE]; + int i; + + if (*this_cache) + return *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 = { + 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); +} + + +static void +ppcfbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (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_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_regset_from_core_section + (gdbarch, ppcfbsd_regset_from_core_section); + + set_gdbarch_fetch_tls_load_module_address (gdbarch, + svr4_fetch_objfile_link_map); +} + +/* Provide a prototype to silence -Wmissing-prototypes. */ + +void _initialize_ppcfbsd_tdep (void); + +void +_initialize_ppcfbsd_tdep (void) +{ + gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc, GDB_OSABI_FREEBSD_ELF, + ppcfbsd_init_abi); + gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64, + GDB_OSABI_FREEBSD_ELF, + ppcfbsd_init_abi); + gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_FREEBSD_ELF, + ppcfbsd_init_abi); +} |