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- /* Target-dependent code for the IA-64 for GDB, the GNU debugger.
- Copyright (C) 2000-2022 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 3 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, 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. */
- #define GATE_AREA_START 0xa000000000000100LL
- #define GATE_AREA_END 0xa000000000020000LL
- /* Offset to sigcontext structure from frame of handler. */
- #define IA64_LINUX_SIGCONTEXT_OFFSET 192
- 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
- sigcontext structure. */
- 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 sigcontext_addr + 200 + 8 * (regno - IA64_GR0_REGNUM);
- else if (IA64_BR0_REGNUM <= regno && regno <= IA64_BR7_REGNUM)
- return sigcontext_addr + 136 + 8 * (regno - IA64_BR0_REGNUM);
- else if (IA64_FR0_REGNUM <= regno && regno <= IA64_FR127_REGNUM)
- return sigcontext_addr + 464 + 16 * (regno - IA64_FR0_REGNUM);
- else
- switch (regno)
- {
- case IA64_IP_REGNUM :
- return sigcontext_addr + 40;
- case IA64_CFM_REGNUM :
- return sigcontext_addr + 48;
- case IA64_PSR_REGNUM :
- 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. */
- case IA64_BSP_REGNUM :
- return sigcontext_addr + 72;
- case IA64_RNAT_REGNUM :
- return sigcontext_addr + 80;
- case IA64_CCV_REGNUM :
- return sigcontext_addr + 88;
- case IA64_UNAT_REGNUM :
- return sigcontext_addr + 96;
- case IA64_FPSR_REGNUM :
- return sigcontext_addr + 104;
- case IA64_PFS_REGNUM :
- return sigcontext_addr + 112;
- case IA64_LC_REGNUM :
- return sigcontext_addr + 120;
- case IA64_PR_REGNUM :
- 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)
- {
- ia64_gdbarch_tdep *tdep = (ia64_gdbarch_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, 0);
- /* 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, linux_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);
- }
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