157 lines
5.2 KiB
C
157 lines
5.2 KiB
C
/* Target-dependent code for the IA-64 for GDB, the GNU debugger.
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Copyright (C) 2000, 2004-2005, 2007-2012 Free Software Foundation,
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Inc.
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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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "ia64-tdep.h"
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#include "arch-utils.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#include "osabi.h"
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#include "solib-svr4.h"
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#include "symtab.h"
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#include "linux-tdep.h"
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/* The sigtramp code is in a non-readable (executable-only) region
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of memory called the ``gate page''. The addresses in question
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were determined by examining the system headers. They are
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overly generous to allow for different pages sizes. */
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#define GATE_AREA_START 0xa000000000000100LL
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#define GATE_AREA_END 0xa000000000020000LL
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/* Offset to sigcontext structure from frame of handler. */
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#define IA64_LINUX_SIGCONTEXT_OFFSET 192
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static int
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ia64_linux_pc_in_sigtramp (CORE_ADDR pc)
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{
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return (pc >= (CORE_ADDR) GATE_AREA_START && pc < (CORE_ADDR) GATE_AREA_END);
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}
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/* IA-64 GNU/Linux specific function which, given a frame address and
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a register number, returns the address at which that register may be
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found. 0 is returned for registers which aren't stored in the
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sigcontext structure. */
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static CORE_ADDR
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ia64_linux_sigcontext_register_address (struct gdbarch *gdbarch,
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CORE_ADDR sp, int regno)
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{
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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char buf[8];
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CORE_ADDR sigcontext_addr = 0;
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/* The address of the sigcontext area is found at offset 16 in the
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sigframe. */
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read_memory (sp + 16, buf, 8);
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sigcontext_addr = extract_unsigned_integer (buf, 8, byte_order);
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if (IA64_GR0_REGNUM <= regno && regno <= IA64_GR31_REGNUM)
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return sigcontext_addr + 200 + 8 * (regno - IA64_GR0_REGNUM);
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else if (IA64_BR0_REGNUM <= regno && regno <= IA64_BR7_REGNUM)
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return sigcontext_addr + 136 + 8 * (regno - IA64_BR0_REGNUM);
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else if (IA64_FR0_REGNUM <= regno && regno <= IA64_FR127_REGNUM)
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return sigcontext_addr + 464 + 16 * (regno - IA64_FR0_REGNUM);
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else
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switch (regno)
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{
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case IA64_IP_REGNUM :
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return sigcontext_addr + 40;
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case IA64_CFM_REGNUM :
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return sigcontext_addr + 48;
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case IA64_PSR_REGNUM :
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return sigcontext_addr + 56; /* user mask only */
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/* sc_ar_rsc is provided, from which we could compute bspstore, but
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I don't think it's worth it. Anyway, if we want it, it's at offset
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64. */
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case IA64_BSP_REGNUM :
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return sigcontext_addr + 72;
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case IA64_RNAT_REGNUM :
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return sigcontext_addr + 80;
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case IA64_CCV_REGNUM :
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return sigcontext_addr + 88;
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case IA64_UNAT_REGNUM :
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return sigcontext_addr + 96;
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case IA64_FPSR_REGNUM :
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return sigcontext_addr + 104;
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case IA64_PFS_REGNUM :
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return sigcontext_addr + 112;
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case IA64_LC_REGNUM :
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return sigcontext_addr + 120;
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case IA64_PR_REGNUM :
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return sigcontext_addr + 128;
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default :
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return 0;
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}
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}
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static void
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ia64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
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{
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ia64_write_pc (regcache, pc);
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/* We must be careful with modifying the instruction-pointer: if we
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just interrupt a system call, the kernel would ordinarily try to
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restart it when we resume the inferior, which typically results
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in SIGSEGV or SIGILL. We prevent this by clearing r10, which
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will tell the kernel that r8 does NOT contain a valid error code
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and hence it will skip system-call restart.
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The clearing of r10 is safe as long as ia64_write_pc() is only
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called as part of setting up an inferior call. */
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regcache_cooked_write_unsigned (regcache, IA64_GR10_REGNUM, 0);
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}
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static void
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ia64_linux_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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linux_init_abi (info, gdbarch);
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/* Set the method of obtaining the sigcontext addresses at which
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registers are saved. */
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tdep->sigcontext_register_address = ia64_linux_sigcontext_register_address;
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/* Set the pc_in_sigtramp method. */
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tdep->pc_in_sigtramp = ia64_linux_pc_in_sigtramp;
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set_gdbarch_write_pc (gdbarch, ia64_linux_write_pc);
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set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_lp64_fetch_link_map_offsets);
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/* Enable TLS support. */
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set_gdbarch_fetch_tls_load_module_address (gdbarch,
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svr4_fetch_objfile_link_map);
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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extern initialize_file_ftype _initialize_ia64_linux_tdep;
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void
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_initialize_ia64_linux_tdep (void)
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{
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gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_LINUX,
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ia64_linux_init_abi);
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}
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