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268 lines
8.8 KiB
C
268 lines
8.8 KiB
C
/* Target-dependent code for the IA-64 for GDB, the GNU debugger.
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Copyright (C) 2000-2017 Free Software Foundation, 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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#include "regset.h"
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#include <ctype.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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gdb_byte 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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/* Implementation of `gdbarch_stap_is_single_operand', as defined in
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gdbarch.h. */
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static int
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ia64_linux_stap_is_single_operand (struct gdbarch *gdbarch, const char *s)
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{
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return ((isdigit (*s) && s[1] == '[' && s[2] == 'r') /* Displacement. */
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|| *s == 'r' /* Register value. */
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|| isdigit (*s)); /* Literal number. */
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}
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/* Core file support. */
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static const struct regcache_map_entry ia64_linux_gregmap[] =
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{
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{ 32, IA64_GR0_REGNUM, 8 }, /* r0 ... r31 */
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{ 1, REGCACHE_MAP_SKIP, 8 }, /* FIXME: NAT collection bits? */
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{ 1, IA64_PR_REGNUM, 8 },
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{ 8, IA64_BR0_REGNUM, 8 }, /* b0 ... b7 */
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{ 1, IA64_IP_REGNUM, 8 },
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{ 1, IA64_CFM_REGNUM, 8 },
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{ 1, IA64_PSR_REGNUM, 8 },
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{ 1, IA64_RSC_REGNUM, 8 },
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{ 1, IA64_BSP_REGNUM, 8 },
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{ 1, IA64_BSPSTORE_REGNUM, 8 },
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{ 1, IA64_RNAT_REGNUM, 8 },
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{ 1, IA64_CCV_REGNUM, 8 },
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{ 1, IA64_UNAT_REGNUM, 8 },
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{ 1, IA64_FPSR_REGNUM, 8 },
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{ 1, IA64_PFS_REGNUM, 8 },
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{ 1, IA64_LC_REGNUM, 8 },
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{ 1, IA64_EC_REGNUM, 8 },
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{ 0 }
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};
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/* Size of 'gregset_t', as defined by the Linux kernel. Note that
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this is more than actually mapped in the regmap above. */
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#define IA64_LINUX_GREGS_SIZE (128 * 8)
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static const struct regcache_map_entry ia64_linux_fpregmap[] =
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{
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{ 128, IA64_FR0_REGNUM, 16 }, /* f0 ... f127 */
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{ 0 }
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};
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#define IA64_LINUX_FPREGS_SIZE (128 * 16)
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static void
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ia64_linux_supply_fpregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *regs, size_t len)
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{
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const gdb_byte f_zero[16] = { 0 };
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const gdb_byte f_one[16] =
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{ 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0xff, 0, 0, 0, 0, 0, 0 };
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regcache_supply_regset (regset, regcache, regnum, regs, len);
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/* Kernel generated cores have fr1==0 instead of 1.0. Older GDBs
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did the same. So ignore whatever might be recorded in fpregset_t
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for fr0/fr1 and always supply their expected values. */
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if (regnum == -1 || regnum == IA64_FR0_REGNUM)
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regcache_raw_supply (regcache, IA64_FR0_REGNUM, f_zero);
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if (regnum == -1 || regnum == IA64_FR1_REGNUM)
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regcache_raw_supply (regcache, IA64_FR1_REGNUM, f_one);
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}
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static const struct regset ia64_linux_gregset =
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{
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ia64_linux_gregmap,
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regcache_supply_regset, regcache_collect_regset
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};
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static const struct regset ia64_linux_fpregset =
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{
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ia64_linux_fpregmap,
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ia64_linux_supply_fpregset, regcache_collect_regset
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};
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static void
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ia64_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
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iterate_over_regset_sections_cb *cb,
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void *cb_data,
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const struct regcache *regcache)
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{
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cb (".reg", IA64_LINUX_GREGS_SIZE, &ia64_linux_gregset, NULL, cb_data);
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cb (".reg2", IA64_LINUX_FPREGS_SIZE, &ia64_linux_fpregset, NULL, cb_data);
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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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static const char *const stap_register_prefixes[] = { "r", NULL };
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static const char *const stap_register_indirection_prefixes[] = { "[",
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NULL };
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static const char *const stap_register_indirection_suffixes[] = { "]",
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NULL };
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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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/* Core file support. */
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set_gdbarch_iterate_over_regset_sections
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(gdbarch, ia64_linux_iterate_over_regset_sections);
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/* SystemTap related. */
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set_gdbarch_stap_register_prefixes (gdbarch, stap_register_prefixes);
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set_gdbarch_stap_register_indirection_prefixes (gdbarch,
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stap_register_indirection_prefixes);
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set_gdbarch_stap_register_indirection_suffixes (gdbarch,
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stap_register_indirection_suffixes);
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set_gdbarch_stap_gdb_register_prefix (gdbarch, "r");
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set_gdbarch_stap_is_single_operand (gdbarch,
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ia64_linux_stap_is_single_operand);
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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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