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Diffstat (limited to 'gdb/i386-nto-tdep.c')
| -rw-r--r-- | gdb/i386-nto-tdep.c | 298 |
1 files changed, 298 insertions, 0 deletions
diff --git a/gdb/i386-nto-tdep.c b/gdb/i386-nto-tdep.c new file mode 100644 index 0000000..b35dd2a --- /dev/null +++ b/gdb/i386-nto-tdep.c @@ -0,0 +1,298 @@ +/* i386-nto-tdep.c - i386 specific functionality for QNX Neutrino. + + Copyright 2003 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 2 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, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include "gdb_string.h" +#include "gdb_assert.h" +#include "defs.h" +#include "frame.h" +#include "target.h" +#include "regcache.h" +#include "solib-svr4.h" +#include "i386-tdep.h" +#include "nto-tdep.h" +#include "osabi.h" +#include "i387-tdep.h" + +#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 + +/* Map a GDB register number to an offset in the reg structure. */ +static int regmap[] = { + (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 * 4) /* filler */ +}; + +/* Given a gdb regno, return the offset into Neutrino's register structure + or -1 if register is unknown. */ +static int +nto_reg_offset (int regno) +{ + return (regno >= 0 && regno < NUM_GPREGS) ? regmap[regno] : -1; +} + +static void +i386nto_supply_gregset (char *gpregs) +{ + unsigned regno; + int empty = 0; + + for (regno = 0; regno < FP0_REGNUM; regno++) + { + int offset = nto_reg_offset (regno); + if (offset == -1) + supply_register (regno, (char *) &empty); + else + supply_register (regno, gpregs + offset); + } +} + +static void +i386nto_supply_fpregset (char *fpregs) +{ + if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR) + i387_supply_fxsave (fpregs); + else + i387_supply_fsave (fpregs); +} + +static void +i386nto_supply_regset (int regset, char *data) +{ + switch (regset) + { + case NTO_REG_GENERAL: /* QNX has different ordering of GP regs than GDB. */ + i386nto_supply_gregset (data); + break; + case NTO_REG_FLOAT: + i386nto_supply_fpregset (data); + break; + } +} + +static int +i386nto_regset_id (int regno) +{ + if (regno == -1) + return NTO_REG_END; + else if (regno < FP0_REGNUM) + return NTO_REG_GENERAL; + else if (regno < FPC_REGNUM) + 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 - FP0_REGNUM) * 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 (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_collect (regno, data + offset); + } + } + else if (regset == NTO_REG_FLOAT) + { + if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR) + i387_fill_fxsave (data, -1); + else + i387_fill_fsave (data, -1); + } + else + return -1; + + return 0; +} + +static struct link_map_offsets * +i386nto_svr4_fetch_link_map_offsets (void) +{ + static struct link_map_offsets lmo; + static struct link_map_offsets *lmp = NULL; + + if (lmp == NULL) + { + lmp = &lmo; + + lmo.r_debug_size = 8; /* The actual size is 20 bytes, but + only 8 bytes are used. */ + lmo.r_map_offset = 4; + lmo.r_map_size = 4; + + lmo.link_map_size = 20; /* The actual size is 552 bytes, but + only 20 bytes are used. */ + lmo.l_addr_offset = 0; + lmo.l_addr_size = 4; + + lmo.l_name_offset = 4; + lmo.l_name_size = 4; + + lmo.l_next_offset = 12; + lmo.l_next_size = 4; + + lmo.l_prev_offset = 16; + lmo.l_prev_size = 4; + } + + return lmp; +} + +static int +i386nto_pc_in_sigtramp (CORE_ADDR pc, char *name) +{ + return name && strcmp ("__signalstub", name) == 0; +} + +#define SIGCONTEXT_OFFSET 136 +static CORE_ADDR +i386nto_sigcontext_addr (struct frame_info *frame) +{ + if (get_next_frame (frame)) + return get_frame_base (get_next_frame (frame)) + SIGCONTEXT_OFFSET; + + return read_register (SP_REGNUM) + SIGCONTEXT_OFFSET; +} + +static void +init_i386nto_ops (void) +{ + current_nto_target.nto_regset_id = i386nto_regset_id; + current_nto_target.nto_supply_gregset = i386nto_supply_gregset; + current_nto_target.nto_supply_fpregset = i386nto_supply_fpregset; + current_nto_target.nto_supply_altregset = nto_dummy_supply_regset; + current_nto_target.nto_supply_regset = i386nto_supply_regset; + current_nto_target.nto_register_area = i386nto_register_area; + current_nto_target.nto_regset_fill = i386nto_regset_fill; + current_nto_target.nto_fetch_link_map_offsets = + i386nto_svr4_fetch_link_map_offsets; +} + +static void +i386nto_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + /* NTO uses ELF. */ + i386_elf_init_abi (info, gdbarch); + + /* Neutrino rewinds to look more normal. */ + set_gdbarch_decr_pc_after_break (gdbarch, 0); + + /* NTO has shared libraries. */ + set_gdbarch_in_solib_call_trampoline (gdbarch, in_plt_section); + set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); + + set_gdbarch_pc_in_sigtramp (gdbarch, i386nto_pc_in_sigtramp); + 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, + i386nto_svr4_fetch_link_map_offsets); + + /* Our loader handles solib relocations slightly differently than svr4. */ + TARGET_SO_RELOCATE_SECTION_ADDRESSES = nto_relocate_section_addresses; + + /* Supply a nice function to find our solibs. */ + TARGET_SO_FIND_AND_OPEN_SOLIB = nto_find_and_open_solib; + + init_i386nto_ops (); +} + +void +_initialize_i386nto_tdep (void) +{ + gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_QNXNTO, + i386nto_init_abi); +} |