| /* Target-dependent code for QNX Neutrino x86. |
| |
| Copyright (C) 2003, 2004, 2007, 2008 Free Software Foundation, Inc. |
| |
| Contributed by QNX Software Systems Ltd. |
| |
| 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 "frame.h" |
| #include "osabi.h" |
| #include "regcache.h" |
| #include "target.h" |
| |
| #include "gdb_assert.h" |
| #include "gdb_string.h" |
| |
| #include "i386-tdep.h" |
| #include "i387-tdep.h" |
| #include "nto-tdep.h" |
| #include "solib.h" |
| #include "solib-svr4.h" |
| |
| /* Target vector for QNX NTO x86. */ |
| static struct nto_target_ops i386_nto_target; |
| |
| #ifndef X86_CPU_FXSR |
| #define X86_CPU_FXSR (1L << 12) |
| #endif |
| |
| /* Why 13? Look in our /usr/include/x86/context.h header at the |
| x86_cpu_registers structure and you'll see an 'exx' junk register |
| that is just filler. Don't ask me, ask the kernel guys. */ |
| #define NUM_GPREGS 13 |
| |
| /* Mapping between the general-purpose registers in `struct xxx' |
| format and GDB's register cache layout. */ |
| |
| /* From <x86/context.h>. */ |
| static int i386nto_gregset_reg_offset[] = |
| { |
| 7 * 4, /* %eax */ |
| 6 * 4, /* %ecx */ |
| 5 * 4, /* %edx */ |
| 4 * 4, /* %ebx */ |
| 11 * 4, /* %esp */ |
| 2 * 4, /* %epb */ |
| 1 * 4, /* %esi */ |
| 0 * 4, /* %edi */ |
| 8 * 4, /* %eip */ |
| 10 * 4, /* %eflags */ |
| 9 * 4, /* %cs */ |
| 12 * 4, /* %ss */ |
| -1 /* filler */ |
| }; |
| |
| /* Given a GDB register number REGNUM, return the offset into |
| Neutrino's register structure or -1 if the register is unknown. */ |
| |
| static int |
| nto_reg_offset (int regnum) |
| { |
| if (regnum >= 0 && regnum < ARRAY_SIZE (i386nto_gregset_reg_offset)) |
| return i386nto_gregset_reg_offset[regnum]; |
| |
| return -1; |
| } |
| |
| static void |
| i386nto_supply_gregset (struct regcache *regcache, char *gpregs) |
| { |
| struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| |
| if(tdep->gregset == NULL) |
| tdep->gregset = regset_alloc (gdbarch, i386_supply_gregset, |
| i386_collect_gregset); |
| |
| gdb_assert (tdep->gregset_reg_offset == i386nto_gregset_reg_offset); |
| tdep->gregset->supply_regset (tdep->gregset, regcache, -1, |
| gpregs, NUM_GPREGS * 4); |
| } |
| |
| static void |
| i386nto_supply_fpregset (struct regcache *regcache, char *fpregs) |
| { |
| if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR) |
| i387_supply_fxsave (regcache, -1, fpregs); |
| else |
| i387_supply_fsave (regcache, -1, fpregs); |
| } |
| |
| static void |
| i386nto_supply_regset (struct regcache *regcache, int regset, char *data) |
| { |
| switch (regset) |
| { |
| case NTO_REG_GENERAL: |
| i386nto_supply_gregset (regcache, data); |
| break; |
| case NTO_REG_FLOAT: |
| i386nto_supply_fpregset (regcache, data); |
| break; |
| } |
| } |
| |
| static int |
| i386nto_regset_id (int regno) |
| { |
| if (regno == -1) |
| return NTO_REG_END; |
| else if (regno < I386_NUM_GREGS) |
| return NTO_REG_GENERAL; |
| else if (regno < I386_NUM_GREGS + I386_NUM_FREGS) |
| return NTO_REG_FLOAT; |
| |
| return -1; /* Error. */ |
| } |
| |
| static int |
| i386nto_register_area (int regno, int regset, unsigned *off) |
| { |
| int len; |
| |
| *off = 0; |
| if (regset == NTO_REG_GENERAL) |
| { |
| if (regno == -1) |
| return NUM_GPREGS * 4; |
| |
| *off = nto_reg_offset (regno); |
| if (*off == -1) |
| return 0; |
| return 4; |
| } |
| else if (regset == NTO_REG_FLOAT) |
| { |
| unsigned off_adjust, regsize, regset_size; |
| |
| if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR) |
| { |
| off_adjust = 32; |
| regsize = 16; |
| regset_size = 512; |
| } |
| else |
| { |
| off_adjust = 28; |
| regsize = 10; |
| regset_size = 128; |
| } |
| |
| if (regno == -1) |
| return regset_size; |
| |
| *off = (regno - gdbarch_fp0_regnum (current_gdbarch)) |
| * regsize + off_adjust; |
| return 10; |
| /* Why 10 instead of regsize? GDB only stores 10 bytes per FP |
| register so if we're sending a register back to the target, |
| we only want pdebug to write 10 bytes so as not to clobber |
| the reserved 6 bytes in the fxsave structure. */ |
| } |
| return -1; |
| } |
| |
| static int |
| i386nto_regset_fill (const struct regcache *regcache, int regset, char *data) |
| { |
| if (regset == NTO_REG_GENERAL) |
| { |
| int regno; |
| |
| for (regno = 0; regno < NUM_GPREGS; regno++) |
| { |
| int offset = nto_reg_offset (regno); |
| if (offset != -1) |
| regcache_raw_collect (regcache, regno, data + offset); |
| } |
| } |
| else if (regset == NTO_REG_FLOAT) |
| { |
| if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR) |
| i387_collect_fxsave (regcache, -1, data); |
| else |
| i387_collect_fsave (regcache, -1, data); |
| } |
| else |
| return -1; |
| |
| return 0; |
| } |
| |
| /* Return whether THIS_FRAME corresponds to a QNX Neutrino sigtramp |
| routine. */ |
| |
| static int |
| i386nto_sigtramp_p (struct frame_info *this_frame) |
| { |
| CORE_ADDR pc = get_frame_pc (this_frame); |
| char *name; |
| |
| find_pc_partial_function (pc, &name, NULL, NULL); |
| return name && strcmp ("__signalstub", name) == 0; |
| } |
| |
| #define I386_NTO_SIGCONTEXT_OFFSET 136 |
| |
| /* Assuming THIS_FRAME is a QNX Neutrino sigtramp routine, return the |
| address of the associated sigcontext structure. */ |
| |
| static CORE_ADDR |
| i386nto_sigcontext_addr (struct frame_info *this_frame) |
| { |
| char buf[4]; |
| CORE_ADDR sp; |
| |
| get_frame_register (this_frame, I386_ESP_REGNUM, buf); |
| sp = extract_unsigned_integer (buf, 4); |
| |
| return sp + I386_NTO_SIGCONTEXT_OFFSET; |
| } |
| |
| static void |
| init_i386nto_ops (void) |
| { |
| i386_nto_target.regset_id = i386nto_regset_id; |
| i386_nto_target.supply_gregset = i386nto_supply_gregset; |
| i386_nto_target.supply_fpregset = i386nto_supply_fpregset; |
| i386_nto_target.supply_altregset = nto_dummy_supply_regset; |
| i386_nto_target.supply_regset = i386nto_supply_regset; |
| i386_nto_target.register_area = i386nto_register_area; |
| i386_nto_target.regset_fill = i386nto_regset_fill; |
| i386_nto_target.fetch_link_map_offsets = |
| svr4_ilp32_fetch_link_map_offsets; |
| } |
| |
| static void |
| i386nto_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| static struct target_so_ops nto_svr4_so_ops; |
| |
| /* Deal with our strange signals. */ |
| nto_initialize_signals (); |
| |
| /* NTO uses ELF. */ |
| i386_elf_init_abi (info, gdbarch); |
| |
| /* Neutrino rewinds to look more normal. Need to override the i386 |
| default which is [unfortunately] to decrement the PC. */ |
| set_gdbarch_decr_pc_after_break (gdbarch, 0); |
| |
| tdep->gregset_reg_offset = i386nto_gregset_reg_offset; |
| tdep->gregset_num_regs = ARRAY_SIZE (i386nto_gregset_reg_offset); |
| tdep->sizeof_gregset = NUM_GPREGS * 4; |
| |
| tdep->sigtramp_p = i386nto_sigtramp_p; |
| tdep->sigcontext_addr = i386nto_sigcontext_addr; |
| tdep->sc_pc_offset = 56; |
| tdep->sc_sp_offset = 68; |
| |
| /* Setjmp()'s return PC saved in EDX (5). */ |
| tdep->jb_pc_offset = 20; /* 5x32 bit ints in. */ |
| |
| set_solib_svr4_fetch_link_map_offsets |
| (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| |
| /* Initialize this lazily, to avoid an initialization order |
| dependency on solib-svr4.c's _initialize routine. */ |
| if (nto_svr4_so_ops.in_dynsym_resolve_code == NULL) |
| { |
| nto_svr4_so_ops = svr4_so_ops; |
| |
| /* Our loader handles solib relocations differently than svr4. */ |
| nto_svr4_so_ops.relocate_section_addresses |
| = nto_relocate_section_addresses; |
| |
| /* Supply a nice function to find our solibs. */ |
| nto_svr4_so_ops.find_and_open_solib |
| = nto_find_and_open_solib; |
| |
| /* Our linker code is in libc. */ |
| nto_svr4_so_ops.in_dynsym_resolve_code |
| = nto_in_dynsym_resolve_code; |
| } |
| set_solib_ops (gdbarch, &nto_svr4_so_ops); |
| |
| nto_set_target (&i386_nto_target); |
| } |
| |
| void |
| _initialize_i386nto_tdep (void) |
| { |
| init_i386nto_ops (); |
| gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_QNXNTO, |
| i386nto_init_abi); |
| gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour, |
| nto_elf_osabi_sniffer); |
| } |