298 lines
7.3 KiB
C
298 lines
7.3 KiB
C
/* i386-nto-tdep.c - i386 specific functionality for QNX Neutrino.
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Copyright 2003 Free Software Foundation, Inc.
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Contributed by QNX Software Systems Ltd.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "gdb_string.h"
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#include "gdb_assert.h"
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#include "defs.h"
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#include "frame.h"
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#include "target.h"
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#include "regcache.h"
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#include "solib-svr4.h"
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#include "i386-tdep.h"
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#include "nto-tdep.h"
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#include "osabi.h"
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#include "i387-tdep.h"
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#ifndef X86_CPU_FXSR
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#define X86_CPU_FXSR (1L << 12)
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#endif
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/* Why 13? Look in our /usr/include/x86/context.h header at the
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x86_cpu_registers structure and you'll see an 'exx' junk register
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that is just filler. Don't ask me, ask the kernel guys. */
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#define NUM_GPREGS 13
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/* Map a GDB register number to an offset in the reg structure. */
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static int regmap[] = {
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(7 * 4), /* eax */
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(6 * 4), /* ecx */
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(5 * 4), /* edx */
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(4 * 4), /* ebx */
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(11 * 4), /* esp */
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(2 * 4), /* epb */
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(1 * 4), /* esi */
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(0 * 4), /* edi */
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(8 * 4), /* eip */
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(10 * 4), /* eflags */
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(9 * 4), /* cs */
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(12 * 4), /* ss */
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(-1 * 4) /* filler */
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};
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/* Given a gdb regno, return the offset into Neutrino's register structure
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or -1 if register is unknown. */
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static int
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nto_reg_offset (int regno)
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{
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return (regno >= 0 && regno < NUM_GPREGS) ? regmap[regno] : -1;
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}
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static void
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i386nto_supply_gregset (char *gpregs)
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{
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unsigned regno;
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int empty = 0;
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for (regno = 0; regno < FP0_REGNUM; regno++)
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{
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int offset = nto_reg_offset (regno);
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if (offset == -1)
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supply_register (regno, (char *) &empty);
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else
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supply_register (regno, gpregs + offset);
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}
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}
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static void
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i386nto_supply_fpregset (char *fpregs)
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{
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if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR)
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i387_supply_fxsave (fpregs);
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else
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i387_supply_fsave (fpregs);
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}
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static void
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i386nto_supply_regset (int regset, char *data)
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{
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switch (regset)
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{
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case NTO_REG_GENERAL: /* QNX has different ordering of GP regs than GDB. */
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i386nto_supply_gregset (data);
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break;
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case NTO_REG_FLOAT:
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i386nto_supply_fpregset (data);
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break;
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}
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}
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static int
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i386nto_regset_id (int regno)
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{
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if (regno == -1)
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return NTO_REG_END;
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else if (regno < FP0_REGNUM)
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return NTO_REG_GENERAL;
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else if (regno < FPC_REGNUM)
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return NTO_REG_FLOAT;
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return -1; /* Error. */
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}
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static int
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i386nto_register_area (int regno, int regset, unsigned *off)
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{
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int len;
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*off = 0;
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if (regset == NTO_REG_GENERAL)
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{
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if (regno == -1)
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return NUM_GPREGS * 4;
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*off = nto_reg_offset (regno);
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if (*off == -1)
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return 0;
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return 4;
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}
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else if (regset == NTO_REG_FLOAT)
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{
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unsigned off_adjust, regsize, regset_size;
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if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR)
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{
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off_adjust = 32;
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regsize = 16;
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regset_size = 512;
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}
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else
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{
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off_adjust = 28;
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regsize = 10;
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regset_size = 128;
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}
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if (regno == -1)
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return regset_size;
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*off = (regno - FP0_REGNUM) * regsize + off_adjust;
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return 10;
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/* Why 10 instead of regsize? GDB only stores 10 bytes per FP
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register so if we're sending a register back to the target,
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we only want pdebug to write 10 bytes so as not to clobber
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the reserved 6 bytes in the fxsave structure. */
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}
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return -1;
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}
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static int
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i386nto_regset_fill (int regset, char *data)
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{
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if (regset == NTO_REG_GENERAL)
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{
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int regno;
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for (regno = 0; regno < NUM_GPREGS; regno++)
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{
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int offset = nto_reg_offset (regno);
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if (offset != -1)
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regcache_collect (regno, data + offset);
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}
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}
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else if (regset == NTO_REG_FLOAT)
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{
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if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR)
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i387_fill_fxsave (data, -1);
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else
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i387_fill_fsave (data, -1);
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}
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else
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return -1;
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return 0;
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}
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static struct link_map_offsets *
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i386nto_svr4_fetch_link_map_offsets (void)
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{
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static struct link_map_offsets lmo;
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static struct link_map_offsets *lmp = NULL;
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if (lmp == NULL)
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{
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lmp = &lmo;
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lmo.r_debug_size = 8; /* The actual size is 20 bytes, but
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only 8 bytes are used. */
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lmo.r_map_offset = 4;
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lmo.r_map_size = 4;
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lmo.link_map_size = 20; /* The actual size is 552 bytes, but
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only 20 bytes are used. */
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lmo.l_addr_offset = 0;
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lmo.l_addr_size = 4;
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lmo.l_name_offset = 4;
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lmo.l_name_size = 4;
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lmo.l_next_offset = 12;
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lmo.l_next_size = 4;
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lmo.l_prev_offset = 16;
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lmo.l_prev_size = 4;
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}
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return lmp;
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}
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static int
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i386nto_pc_in_sigtramp (CORE_ADDR pc, char *name)
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{
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return name && strcmp ("__signalstub", name) == 0;
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}
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#define SIGCONTEXT_OFFSET 136
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static CORE_ADDR
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i386nto_sigcontext_addr (struct frame_info *frame)
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{
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if (get_next_frame (frame))
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return get_frame_base (get_next_frame (frame)) + SIGCONTEXT_OFFSET;
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return read_register (SP_REGNUM) + SIGCONTEXT_OFFSET;
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}
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static void
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init_i386nto_ops (void)
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{
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current_nto_target.nto_regset_id = i386nto_regset_id;
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current_nto_target.nto_supply_gregset = i386nto_supply_gregset;
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current_nto_target.nto_supply_fpregset = i386nto_supply_fpregset;
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current_nto_target.nto_supply_altregset = nto_dummy_supply_regset;
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current_nto_target.nto_supply_regset = i386nto_supply_regset;
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current_nto_target.nto_register_area = i386nto_register_area;
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current_nto_target.nto_regset_fill = i386nto_regset_fill;
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current_nto_target.nto_fetch_link_map_offsets =
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i386nto_svr4_fetch_link_map_offsets;
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}
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static void
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i386nto_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* NTO uses ELF. */
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i386_elf_init_abi (info, gdbarch);
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/* Neutrino rewinds to look more normal. */
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set_gdbarch_decr_pc_after_break (gdbarch, 0);
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/* NTO has shared libraries. */
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set_gdbarch_in_solib_call_trampoline (gdbarch, in_plt_section);
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set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
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set_gdbarch_pc_in_sigtramp (gdbarch, i386nto_pc_in_sigtramp);
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tdep->sigcontext_addr = i386nto_sigcontext_addr;
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tdep->sc_pc_offset = 56;
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tdep->sc_sp_offset = 68;
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/* Setjmp()'s return PC saved in EDX (5). */
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tdep->jb_pc_offset = 20; /* 5x32 bit ints in. */
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set_solib_svr4_fetch_link_map_offsets (gdbarch,
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i386nto_svr4_fetch_link_map_offsets);
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/* Our loader handles solib relocations slightly differently than svr4. */
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TARGET_SO_RELOCATE_SECTION_ADDRESSES = nto_relocate_section_addresses;
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/* Supply a nice function to find our solibs. */
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TARGET_SO_FIND_AND_OPEN_SOLIB = nto_find_and_open_solib;
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init_i386nto_ops ();
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}
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void
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_initialize_i386nto_tdep (void)
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{
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gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_QNXNTO,
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i386nto_init_abi);
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}
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