/* Target-dependent code for the IA-64 for GDB, the GNU debugger.
- Copyright 2000
- Free Software Foundation, Inc.
+
+ Copyright (C) 2000-2020 Free Software Foundation, Inc.
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
+ 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,
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. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
+#include "ia64-tdep.h"
#include "arch-utils.h"
+#include "gdbcore.h"
+#include "regcache.h"
+#include "osabi.h"
+#include "solib-svr4.h"
+#include "symtab.h"
+#include "linux-tdep.h"
+#include "regset.h"
+
+#include <ctype.h>
/* The sigtramp code is in a non-readable (executable-only) region
of memory called the ``gate page''. The addresses in question
were determined by examining the system headers. They are
- overly generous to allow for different pages sizes. */
+ overly generous to allow for different pages sizes. */
#define GATE_AREA_START 0xa000000000000100LL
-#define GATE_AREA_END 0xa000000000010000LL
+#define GATE_AREA_END 0xa000000000020000LL
-/* Offset to sigcontext structure from frame of handler */
-#define IA64_LINUX_SIGCONTEXT_OFFSET 160
+/* Offset to sigcontext structure from frame of handler. */
+#define IA64_LINUX_SIGCONTEXT_OFFSET 192
-int
-ia64_linux_in_sigtramp (CORE_ADDR pc, char *func_name)
+static int
+ia64_linux_pc_in_sigtramp (CORE_ADDR pc)
{
return (pc >= (CORE_ADDR) GATE_AREA_START && pc < (CORE_ADDR) GATE_AREA_END);
}
/* IA-64 GNU/Linux specific function which, given a frame address and
a register number, returns the address at which that register may be
- found. 0 is returned for registers which aren't stored in the the
- sigcontext structure. */
+ found. 0 is returned for registers which aren't stored in the
+ sigcontext structure. */
-CORE_ADDR
-ia64_linux_sigcontext_register_address (CORE_ADDR sp, int regno)
+static CORE_ADDR
+ia64_linux_sigcontext_register_address (struct gdbarch *gdbarch,
+ CORE_ADDR sp, int regno)
{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ gdb_byte buf[8];
+ CORE_ADDR sigcontext_addr = 0;
+
+ /* The address of the sigcontext area is found at offset 16 in the
+ sigframe. */
+ read_memory (sp + 16, buf, 8);
+ sigcontext_addr = extract_unsigned_integer (buf, 8, byte_order);
+
if (IA64_GR0_REGNUM <= regno && regno <= IA64_GR31_REGNUM)
- return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 200 + 8 * (regno - IA64_GR0_REGNUM);
+ return sigcontext_addr + 200 + 8 * (regno - IA64_GR0_REGNUM);
else if (IA64_BR0_REGNUM <= regno && regno <= IA64_BR7_REGNUM)
- return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 136 + 8 * (regno - IA64_BR0_REGNUM);
+ return sigcontext_addr + 136 + 8 * (regno - IA64_BR0_REGNUM);
else if (IA64_FR0_REGNUM <= regno && regno <= IA64_FR127_REGNUM)
- return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 464 + 16 * (regno - IA64_FR0_REGNUM);
+ return sigcontext_addr + 464 + 16 * (regno - IA64_FR0_REGNUM);
else
switch (regno)
{
case IA64_IP_REGNUM :
- return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 40;
+ return sigcontext_addr + 40;
case IA64_CFM_REGNUM :
- return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 48;
+ return sigcontext_addr + 48;
case IA64_PSR_REGNUM :
- return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 56; /* user mask only */
+ return sigcontext_addr + 56; /* user mask only */
/* sc_ar_rsc is provided, from which we could compute bspstore, but
I don't think it's worth it. Anyway, if we want it, it's at offset
- 64 */
+ 64. */
case IA64_BSP_REGNUM :
- return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 72;
+ return sigcontext_addr + 72;
case IA64_RNAT_REGNUM :
- return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 80;
+ return sigcontext_addr + 80;
case IA64_CCV_REGNUM :
- return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 88;
+ return sigcontext_addr + 88;
case IA64_UNAT_REGNUM :
- return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 96;
+ return sigcontext_addr + 96;
case IA64_FPSR_REGNUM :
- return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 104;
+ return sigcontext_addr + 104;
case IA64_PFS_REGNUM :
- return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 112;
+ return sigcontext_addr + 112;
case IA64_LC_REGNUM :
- return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 120;
+ return sigcontext_addr + 120;
case IA64_PR_REGNUM :
- return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 128;
+ return sigcontext_addr + 128;
default :
return 0;
}
}
+
+static void
+ia64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
+{
+ ia64_write_pc (regcache, pc);
+
+ /* We must be careful with modifying the instruction-pointer: if we
+ just interrupt a system call, the kernel would ordinarily try to
+ restart it when we resume the inferior, which typically results
+ in SIGSEGV or SIGILL. We prevent this by clearing r10, which
+ will tell the kernel that r8 does NOT contain a valid error code
+ and hence it will skip system-call restart.
+
+ The clearing of r10 is safe as long as ia64_write_pc() is only
+ called as part of setting up an inferior call. */
+ regcache_cooked_write_unsigned (regcache, IA64_GR10_REGNUM, 0);
+}
+
+/* Implementation of `gdbarch_stap_is_single_operand', as defined in
+ gdbarch.h. */
+
+static int
+ia64_linux_stap_is_single_operand (struct gdbarch *gdbarch, const char *s)
+{
+ return ((isdigit (*s) && s[1] == '[' && s[2] == 'r') /* Displacement. */
+ || *s == 'r' /* Register value. */
+ || isdigit (*s)); /* Literal number. */
+}
+
+/* Core file support. */
+
+static const struct regcache_map_entry ia64_linux_gregmap[] =
+ {
+ { 32, IA64_GR0_REGNUM, 8 }, /* r0 ... r31 */
+ { 1, REGCACHE_MAP_SKIP, 8 }, /* FIXME: NAT collection bits? */
+ { 1, IA64_PR_REGNUM, 8 },
+ { 8, IA64_BR0_REGNUM, 8 }, /* b0 ... b7 */
+ { 1, IA64_IP_REGNUM, 8 },
+ { 1, IA64_CFM_REGNUM, 8 },
+ { 1, IA64_PSR_REGNUM, 8 },
+ { 1, IA64_RSC_REGNUM, 8 },
+ { 1, IA64_BSP_REGNUM, 8 },
+ { 1, IA64_BSPSTORE_REGNUM, 8 },
+ { 1, IA64_RNAT_REGNUM, 8 },
+ { 1, IA64_CCV_REGNUM, 8 },
+ { 1, IA64_UNAT_REGNUM, 8 },
+ { 1, IA64_FPSR_REGNUM, 8 },
+ { 1, IA64_PFS_REGNUM, 8 },
+ { 1, IA64_LC_REGNUM, 8 },
+ { 1, IA64_EC_REGNUM, 8 },
+ { 0 }
+ };
+
+/* Size of 'gregset_t', as defined by the Linux kernel. Note that
+ this is more than actually mapped in the regmap above. */
+
+#define IA64_LINUX_GREGS_SIZE (128 * 8)
+
+static const struct regcache_map_entry ia64_linux_fpregmap[] =
+ {
+ { 128, IA64_FR0_REGNUM, 16 }, /* f0 ... f127 */
+ { 0 }
+ };
+
+#define IA64_LINUX_FPREGS_SIZE (128 * 16)
+
+static void
+ia64_linux_supply_fpregset (const struct regset *regset,
+ struct regcache *regcache,
+ int regnum, const void *regs, size_t len)
+{
+ const gdb_byte f_zero[16] = { 0 };
+ const gdb_byte f_one[16] =
+ { 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0xff, 0, 0, 0, 0, 0, 0 };
+
+ regcache_supply_regset (regset, regcache, regnum, regs, len);
+
+ /* Kernel generated cores have fr1==0 instead of 1.0. Older GDBs
+ did the same. So ignore whatever might be recorded in fpregset_t
+ for fr0/fr1 and always supply their expected values. */
+ if (regnum == -1 || regnum == IA64_FR0_REGNUM)
+ regcache->raw_supply (IA64_FR0_REGNUM, f_zero);
+ if (regnum == -1 || regnum == IA64_FR1_REGNUM)
+ regcache->raw_supply (IA64_FR1_REGNUM, f_one);
+}
+
+static const struct regset ia64_linux_gregset =
+ {
+ ia64_linux_gregmap,
+ regcache_supply_regset, regcache_collect_regset
+ };
+
+static const struct regset ia64_linux_fpregset =
+ {
+ ia64_linux_fpregmap,
+ ia64_linux_supply_fpregset, regcache_collect_regset
+ };
+
+static void
+ia64_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
+ iterate_over_regset_sections_cb *cb,
+ void *cb_data,
+ const struct regcache *regcache)
+{
+ cb (".reg", IA64_LINUX_GREGS_SIZE, IA64_LINUX_GREGS_SIZE, &ia64_linux_gregset,
+ NULL, cb_data);
+ cb (".reg2", IA64_LINUX_FPREGS_SIZE, IA64_LINUX_FPREGS_SIZE,
+ &ia64_linux_fpregset, NULL, cb_data);
+}
+
+static void
+ia64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ static const char *const stap_register_prefixes[] = { "r", NULL };
+ static const char *const stap_register_indirection_prefixes[] = { "[",
+ NULL };
+ static const char *const stap_register_indirection_suffixes[] = { "]",
+ NULL };
+
+ linux_init_abi (info, gdbarch);
+
+ /* Set the method of obtaining the sigcontext addresses at which
+ registers are saved. */
+ tdep->sigcontext_register_address = ia64_linux_sigcontext_register_address;
+
+ /* Set the pc_in_sigtramp method. */
+ tdep->pc_in_sigtramp = ia64_linux_pc_in_sigtramp;
+
+ set_gdbarch_write_pc (gdbarch, ia64_linux_write_pc);
+
+ set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
+
+ set_solib_svr4_fetch_link_map_offsets
+ (gdbarch, svr4_lp64_fetch_link_map_offsets);
+
+ /* Enable TLS support. */
+ set_gdbarch_fetch_tls_load_module_address (gdbarch,
+ svr4_fetch_objfile_link_map);
+
+ /* Core file support. */
+ set_gdbarch_iterate_over_regset_sections
+ (gdbarch, ia64_linux_iterate_over_regset_sections);
+
+ /* SystemTap related. */
+ set_gdbarch_stap_register_prefixes (gdbarch, stap_register_prefixes);
+ set_gdbarch_stap_register_indirection_prefixes (gdbarch,
+ stap_register_indirection_prefixes);
+ set_gdbarch_stap_register_indirection_suffixes (gdbarch,
+ stap_register_indirection_suffixes);
+ set_gdbarch_stap_gdb_register_prefix (gdbarch, "r");
+ set_gdbarch_stap_is_single_operand (gdbarch,
+ ia64_linux_stap_is_single_operand);
+}
+
+void _initialize_ia64_linux_tdep ();
+void
+_initialize_ia64_linux_tdep ()
+{
+ gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_LINUX,
+ ia64_linux_init_abi);
+}
projects / deliverable / binutils-gdb.git / blobdiff