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- /* Target-dependent code for FreeBSD/amd64.
- Copyright (C) 2003-2022 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 "osabi.h"
- #include "regset.h"
- #include "target.h"
- #include "trad-frame.h"
- #include "tramp-frame.h"
- #include "i386-fbsd-tdep.h"
- #include "gdbsupport/x86-xstate.h"
- #include "amd64-tdep.h"
- #include "amd64-fbsd-tdep.h"
- #include "fbsd-tdep.h"
- #include "solib-svr4.h"
- #include "inferior.h"
- /* The general-purpose regset consists of 22 64-bit slots, most of
- which contain individual registers, but a few contain multiple
- 16-bit segment registers. */
- #define AMD64_FBSD_SIZEOF_GREGSET (22 * 8)
- /* The segment base register set consists of 2 64-bit registers. */
- #define AMD64_FBSD_SIZEOF_SEGBASES_REGSET (2 * 8)
- /* Register maps. */
- static const struct regcache_map_entry amd64_fbsd_gregmap[] =
- {
- { 1, AMD64_R15_REGNUM, 0 },
- { 1, AMD64_R14_REGNUM, 0 },
- { 1, AMD64_R13_REGNUM, 0 },
- { 1, AMD64_R12_REGNUM, 0 },
- { 1, AMD64_R11_REGNUM, 0 },
- { 1, AMD64_R10_REGNUM, 0 },
- { 1, AMD64_R9_REGNUM, 0 },
- { 1, AMD64_R8_REGNUM, 0 },
- { 1, AMD64_RDI_REGNUM, 0 },
- { 1, AMD64_RSI_REGNUM, 0 },
- { 1, AMD64_RBP_REGNUM, 0 },
- { 1, AMD64_RBX_REGNUM, 0 },
- { 1, AMD64_RDX_REGNUM, 0 },
- { 1, AMD64_RCX_REGNUM, 0 },
- { 1, AMD64_RAX_REGNUM, 0 },
- { 1, REGCACHE_MAP_SKIP, 4 }, /* trapno */
- { 1, AMD64_FS_REGNUM, 2 },
- { 1, AMD64_GS_REGNUM, 2 },
- { 1, REGCACHE_MAP_SKIP, 4 }, /* err */
- { 1, AMD64_ES_REGNUM, 2 },
- { 1, AMD64_DS_REGNUM, 2 },
- { 1, AMD64_RIP_REGNUM, 0 },
- { 1, AMD64_CS_REGNUM, 8 },
- { 1, AMD64_EFLAGS_REGNUM, 8 },
- { 1, AMD64_RSP_REGNUM, 0 },
- { 1, AMD64_SS_REGNUM, 8 },
- { 0 }
- };
- static const struct regcache_map_entry amd64_fbsd_segbases_regmap[] =
- {
- { 1, AMD64_FSBASE_REGNUM, 0 },
- { 1, AMD64_GSBASE_REGNUM, 0 },
- { 0 }
- };
- /* This layout including fsbase and gsbase was adopted in FreeBSD
- 8.0. */
- static const struct regcache_map_entry amd64_fbsd_mcregmap[] =
- {
- { 1, REGCACHE_MAP_SKIP, 8 }, /* mc_onstack */
- { 1, AMD64_RDI_REGNUM, 0 },
- { 1, AMD64_RSI_REGNUM, 0 },
- { 1, AMD64_RDX_REGNUM, 0 },
- { 1, AMD64_RCX_REGNUM, 0 },
- { 1, AMD64_R8_REGNUM, 0 },
- { 1, AMD64_R9_REGNUM, 0 },
- { 1, AMD64_RAX_REGNUM, 0 },
- { 1, AMD64_RBX_REGNUM, 0 },
- { 1, AMD64_RBP_REGNUM, 0 },
- { 1, AMD64_R10_REGNUM, 0 },
- { 1, AMD64_R11_REGNUM, 0 },
- { 1, AMD64_R12_REGNUM, 0 },
- { 1, AMD64_R13_REGNUM, 0 },
- { 1, AMD64_R14_REGNUM, 0 },
- { 1, AMD64_R15_REGNUM, 0 },
- { 1, REGCACHE_MAP_SKIP, 4 }, /* mc_trapno */
- { 1, AMD64_FS_REGNUM, 2 },
- { 1, AMD64_GS_REGNUM, 2 },
- { 1, REGCACHE_MAP_SKIP, 8 }, /* mc_addr */
- { 1, REGCACHE_MAP_SKIP, 4 }, /* mc_flags */
- { 1, AMD64_ES_REGNUM, 2 },
- { 1, AMD64_DS_REGNUM, 2 },
- { 1, REGCACHE_MAP_SKIP, 8 }, /* mc_err */
- { 1, AMD64_RIP_REGNUM, 0 },
- { 1, AMD64_CS_REGNUM, 8 },
- { 1, AMD64_EFLAGS_REGNUM, 8 },
- { 1, AMD64_RSP_REGNUM, 0 },
- { 1, AMD64_SS_REGNUM, 8 },
- { 1, REGCACHE_MAP_SKIP, 8 }, /* mc_len */
- { 1, REGCACHE_MAP_SKIP, 8 }, /* mc_fpformat */
- { 1, REGCACHE_MAP_SKIP, 8 }, /* mc_ownedfp */
- { 64, REGCACHE_MAP_SKIP, 8 }, /* mc_fpstate */
- { 1, AMD64_FSBASE_REGNUM, 0 },
- { 1, AMD64_GSBASE_REGNUM, 0 },
- { 0 }
- };
- /* Register set definitions. */
- const struct regset amd64_fbsd_gregset =
- {
- amd64_fbsd_gregmap, regcache_supply_regset, regcache_collect_regset
- };
- const struct regset amd64_fbsd_segbases_regset =
- {
- amd64_fbsd_segbases_regmap, regcache_supply_regset, regcache_collect_regset
- };
- /* Support for signal handlers. */
- /* In a signal frame, rsp points to a 'struct sigframe' which is
- defined as:
- struct sigframe {
- union {
- __siginfohandler_t *sf_action;
- __sighandler_t *sf_handler;
- } sf_ahu;
- ucontext_t sf_uc;
- ...
- }
- ucontext_t is defined as:
- struct __ucontext {
- sigset_t uc_sigmask;
- mcontext_t uc_mcontext;
- ...
- };
- The mcontext_t contains the general purpose register set as well
- as the floating point or XSAVE state. */
- /* NB: There is an 8 byte padding hole between sf_ahu and sf_uc. */
- #define AMD64_SIGFRAME_UCONTEXT_OFFSET 16
- #define AMD64_UCONTEXT_MCONTEXT_OFFSET 16
- #define AMD64_SIZEOF_MCONTEXT_T 800
- /* Implement the "init" method of struct tramp_frame. */
- static void
- amd64_fbsd_sigframe_init (const struct tramp_frame *self,
- struct frame_info *this_frame,
- struct trad_frame_cache *this_cache,
- CORE_ADDR func)
- {
- CORE_ADDR sp = get_frame_register_unsigned (this_frame, AMD64_RSP_REGNUM);
- CORE_ADDR mcontext_addr
- = (sp
- + AMD64_SIGFRAME_UCONTEXT_OFFSET
- + AMD64_UCONTEXT_MCONTEXT_OFFSET);
- trad_frame_set_reg_regmap (this_cache, amd64_fbsd_mcregmap, mcontext_addr,
- AMD64_SIZEOF_MCONTEXT_T);
- /* Don't bother with floating point or XSAVE state for now. The
- current helper routines for parsing FXSAVE and XSAVE state only
- work with regcaches. This could perhaps create a temporary
- regcache, collect the register values from mc_fpstate and
- mc_xfpustate, and then set register values in the trad_frame. */
- trad_frame_set_id (this_cache, frame_id_build (sp, func));
- }
- static const struct tramp_frame amd64_fbsd_sigframe =
- {
- SIGTRAMP_FRAME,
- 1,
- {
- {0x48, ULONGEST_MAX}, /* lea SIGF_UC(%rsp),%rdi */
- {0x8d, ULONGEST_MAX},
- {0x7c, ULONGEST_MAX},
- {0x24, ULONGEST_MAX},
- {0x10, ULONGEST_MAX},
- {0x6a, ULONGEST_MAX}, /* pushq $0 */
- {0x00, ULONGEST_MAX},
- {0x48, ULONGEST_MAX}, /* movq $SYS_sigreturn,%rax */
- {0xc7, ULONGEST_MAX},
- {0xc0, ULONGEST_MAX},
- {0xa1, ULONGEST_MAX},
- {0x01, ULONGEST_MAX},
- {0x00, ULONGEST_MAX},
- {0x00, ULONGEST_MAX},
- {0x0f, ULONGEST_MAX}, /* syscall */
- {0x05, ULONGEST_MAX},
- {TRAMP_SENTINEL_INSN, ULONGEST_MAX}
- },
- amd64_fbsd_sigframe_init
- };
- /* Implement the core_read_description gdbarch method. */
- static const struct target_desc *
- amd64fbsd_core_read_description (struct gdbarch *gdbarch,
- struct target_ops *target,
- bfd *abfd)
- {
- return amd64_target_description (i386fbsd_core_read_xcr0 (abfd), true);
- }
- /* Similar to amd64_supply_fpregset, but use XSAVE extended state. */
- static void
- amd64fbsd_supply_xstateregset (const struct regset *regset,
- struct regcache *regcache, int regnum,
- const void *xstateregs, size_t len)
- {
- amd64_supply_xsave (regcache, regnum, xstateregs);
- }
- /* Similar to amd64_collect_fpregset, but use XSAVE extended state. */
- static void
- amd64fbsd_collect_xstateregset (const struct regset *regset,
- const struct regcache *regcache,
- int regnum, void *xstateregs, size_t len)
- {
- amd64_collect_xsave (regcache, regnum, xstateregs, 1);
- }
- static const struct regset amd64fbsd_xstateregset =
- {
- NULL,
- amd64fbsd_supply_xstateregset,
- amd64fbsd_collect_xstateregset
- };
- /* Iterate over core file register note sections. */
- static void
- amd64fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
- iterate_over_regset_sections_cb *cb,
- void *cb_data,
- const struct regcache *regcache)
- {
- i386_gdbarch_tdep *tdep = (i386_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- cb (".reg", AMD64_FBSD_SIZEOF_GREGSET, AMD64_FBSD_SIZEOF_GREGSET,
- &amd64_fbsd_gregset, NULL, cb_data);
- cb (".reg2", tdep->sizeof_fpregset, tdep->sizeof_fpregset, &amd64_fpregset,
- NULL, cb_data);
- cb (".reg-x86-segbases", AMD64_FBSD_SIZEOF_SEGBASES_REGSET,
- AMD64_FBSD_SIZEOF_SEGBASES_REGSET, &amd64_fbsd_segbases_regset,
- "segment bases", cb_data);
- cb (".reg-xstate", X86_XSTATE_SIZE (tdep->xcr0), X86_XSTATE_SIZE (tdep->xcr0),
- &amd64fbsd_xstateregset, "XSAVE extended state", cb_data);
- }
- /* Implement the get_thread_local_address gdbarch method. */
- static CORE_ADDR
- amd64fbsd_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid,
- CORE_ADDR lm_addr, CORE_ADDR offset)
- {
- struct regcache *regcache;
- regcache = get_thread_arch_regcache (current_inferior ()->process_target (),
- ptid, gdbarch);
- target_fetch_registers (regcache, AMD64_FSBASE_REGNUM);
- ULONGEST fsbase;
- if (regcache->cooked_read (AMD64_FSBASE_REGNUM, &fsbase) != REG_VALID)
- error (_("Unable to fetch %%fsbase"));
- CORE_ADDR dtv_addr = fsbase + gdbarch_ptr_bit (gdbarch) / 8;
- return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset);
- }
- static void
- amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
- {
- i386_gdbarch_tdep *tdep = (i386_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- /* Generic FreeBSD support. */
- fbsd_init_abi (info, gdbarch);
- /* Obviously FreeBSD is BSD-based. */
- i386bsd_init_abi (info, gdbarch);
- amd64_init_abi (info, gdbarch,
- amd64_target_description (X86_XSTATE_SSE_MASK, true));
- tramp_frame_prepend_unwinder (gdbarch, &amd64_fbsd_sigframe);
- tdep->xsave_xcr0_offset = I386_FBSD_XSAVE_XCR0_OFFSET;
- /* Iterate over core file register note sections. */
- set_gdbarch_iterate_over_regset_sections
- (gdbarch, amd64fbsd_iterate_over_regset_sections);
- set_gdbarch_core_read_description (gdbarch,
- amd64fbsd_core_read_description);
- /* FreeBSD uses SVR4-style shared libraries. */
- set_solib_svr4_fetch_link_map_offsets
- (gdbarch, svr4_lp64_fetch_link_map_offsets);
- set_gdbarch_fetch_tls_load_module_address (gdbarch,
- svr4_fetch_objfile_link_map);
- set_gdbarch_get_thread_local_address (gdbarch,
- amd64fbsd_get_thread_local_address);
- }
- void _initialize_amd64fbsd_tdep ();
- void
- _initialize_amd64fbsd_tdep ()
- {
- gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
- GDB_OSABI_FREEBSD, amd64fbsd_init_abi);
- }
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