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- /* Native-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 "inferior.h"
- #include "regcache.h"
- #include "target.h"
- #include <signal.h>
- #include <sys/types.h>
- #include <sys/ptrace.h>
- #include <sys/sysctl.h>
- #include <sys/user.h>
- #include <machine/reg.h>
- #include "amd64-tdep.h"
- #include "amd64-fbsd-tdep.h"
- #include "amd64-nat.h"
- #include "x86-nat.h"
- #include "gdbsupport/x86-xstate.h"
- #include "x86-fbsd-nat.h"
- class amd64_fbsd_nat_target final : public x86_fbsd_nat_target
- {
- public:
- void fetch_registers (struct regcache *, int) override;
- void store_registers (struct regcache *, int) override;
- const struct target_desc *read_description () override;
- };
- static amd64_fbsd_nat_target the_amd64_fbsd_nat_target;
- #ifdef PT_GETXSTATE_INFO
- static size_t xsave_len;
- #endif
- /* This is a layout of the amd64 'struct reg' but with i386
- registers. */
- static const struct regcache_map_entry amd64_fbsd32_gregmap[] =
- {
- { 8, REGCACHE_MAP_SKIP, 8 },
- { 1, I386_EDI_REGNUM, 8 },
- { 1, I386_ESI_REGNUM, 8 },
- { 1, I386_EBP_REGNUM, 8 },
- { 1, I386_EBX_REGNUM, 8 },
- { 1, I386_EDX_REGNUM, 8 },
- { 1, I386_ECX_REGNUM, 8 },
- { 1, I386_EAX_REGNUM, 8 },
- { 1, REGCACHE_MAP_SKIP, 4 }, /* trapno */
- { 1, I386_FS_REGNUM, 2 },
- { 1, I386_GS_REGNUM, 2 },
- { 1, REGCACHE_MAP_SKIP, 4 }, /* err */
- { 1, I386_ES_REGNUM, 2 },
- { 1, I386_DS_REGNUM, 2 },
- { 1, I386_EIP_REGNUM, 8 },
- { 1, I386_CS_REGNUM, 8 },
- { 1, I386_EFLAGS_REGNUM, 8 },
- { 1, I386_ESP_REGNUM, 0 },
- { 1, I386_SS_REGNUM, 8 },
- { 0 }
- };
- static const struct regset amd64_fbsd32_gregset =
- {
- amd64_fbsd32_gregmap, regcache_supply_regset, regcache_collect_regset
- };
- /* Return the regset to use for 'struct reg' for the GDBARCH. */
- static const struct regset *
- find_gregset (struct gdbarch *gdbarch)
- {
- if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32)
- return &amd64_fbsd32_gregset;
- else
- return &amd64_fbsd_gregset;
- }
- /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
- for all registers. */
- void
- amd64_fbsd_nat_target::fetch_registers (struct regcache *regcache, int regnum)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- #if defined(PT_GETFSBASE) || defined(PT_GETGSBASE)
- const i386_gdbarch_tdep *tdep = (i386_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- #endif
- pid_t pid = get_ptrace_pid (regcache->ptid ());
- const struct regset *gregset = find_gregset (gdbarch);
- if (fetch_register_set<struct reg> (regcache, regnum, PT_GETREGS, gregset))
- {
- if (regnum != -1)
- return;
- }
- #ifdef PT_GETFSBASE
- if (regnum == -1 || regnum == tdep->fsbase_regnum)
- {
- register_t base;
- if (ptrace (PT_GETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
- perror_with_name (_("Couldn't get segment register fs_base"));
- regcache->raw_supply (tdep->fsbase_regnum, &base);
- if (regnum != -1)
- return;
- }
- #endif
- #ifdef PT_GETGSBASE
- if (regnum == -1 || regnum == tdep->fsbase_regnum + 1)
- {
- register_t base;
- if (ptrace (PT_GETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
- perror_with_name (_("Couldn't get segment register gs_base"));
- regcache->raw_supply (tdep->fsbase_regnum + 1, &base);
- if (regnum != -1)
- return;
- }
- #endif
- /* There is no amd64_fxsave_supplies or amd64_xsave_supplies.
- Instead, the earlier register sets return early if the request
- was for a specific register that was already satisified to avoid
- fetching the FPU/XSAVE state unnecessarily. */
- #ifdef PT_GETXSTATE_INFO
- if (xsave_len != 0)
- {
- void *xstateregs = alloca (xsave_len);
- if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
- perror_with_name (_("Couldn't get extended state status"));
- amd64_supply_xsave (regcache, regnum, xstateregs);
- return;
- }
- #endif
- struct fpreg fpregs;
- if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
- perror_with_name (_("Couldn't get floating point status"));
- amd64_supply_fxsave (regcache, regnum, &fpregs);
- }
- /* Store register REGNUM back into the inferior. If REGNUM is -1, do
- this for all registers. */
- void
- amd64_fbsd_nat_target::store_registers (struct regcache *regcache, int regnum)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- #if defined(PT_GETFSBASE) || defined(PT_GETGSBASE)
- const i386_gdbarch_tdep *tdep = (i386_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- #endif
- pid_t pid = get_ptrace_pid (regcache->ptid ());
- const struct regset *gregset = find_gregset (gdbarch);
- if (store_register_set<struct reg> (regcache, regnum, PT_GETREGS, PT_SETREGS,
- gregset))
- {
- if (regnum != -1)
- return;
- }
- #ifdef PT_SETFSBASE
- if (regnum == -1 || regnum == tdep->fsbase_regnum)
- {
- register_t base;
- /* Clear the full base value to support 32-bit targets. */
- base = 0;
- regcache->raw_collect (tdep->fsbase_regnum, &base);
- if (ptrace (PT_SETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
- perror_with_name (_("Couldn't write segment register fs_base"));
- if (regnum != -1)
- return;
- }
- #endif
- #ifdef PT_SETGSBASE
- if (regnum == -1 || regnum == tdep->fsbase_regnum + 1)
- {
- register_t base;
- /* Clear the full base value to support 32-bit targets. */
- base = 0;
- regcache->raw_collect (tdep->fsbase_regnum + 1, &base);
- if (ptrace (PT_SETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
- perror_with_name (_("Couldn't write segment register gs_base"));
- if (regnum != -1)
- return;
- }
- #endif
- /* There is no amd64_fxsave_supplies or amd64_xsave_supplies.
- Instead, the earlier register sets return early if the request
- was for a specific register that was already satisified to avoid
- fetching the FPU/XSAVE state unnecessarily. */
- #ifdef PT_GETXSTATE_INFO
- if (xsave_len != 0)
- {
- void *xstateregs = alloca (xsave_len);
- if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
- perror_with_name (_("Couldn't get extended state status"));
- amd64_collect_xsave (regcache, regnum, xstateregs, 0);
- if (ptrace (PT_SETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs,
- xsave_len) == -1)
- perror_with_name (_("Couldn't write extended state status"));
- return;
- }
- #endif
- struct fpreg fpregs;
- if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
- perror_with_name (_("Couldn't get floating point status"));
- amd64_collect_fxsave (regcache, regnum, &fpregs);
- if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
- perror_with_name (_("Couldn't write floating point status"));
- }
- /* Support for debugging kernel virtual memory images. */
- #include <machine/pcb.h>
- #include <osreldate.h>
- #include "bsd-kvm.h"
- static int
- amd64fbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
- {
- /* The following is true for FreeBSD 5.2:
- The pcb contains %rip, %rbx, %rsp, %rbp, %r12, %r13, %r14, %r15,
- %ds, %es, %fs and %gs. This accounts for all callee-saved
- registers specified by the psABI and then some. Here %esp
- contains the stack pointer at the point just after the call to
- cpu_switch(). From this information we reconstruct the register
- state as it would like when we just returned from cpu_switch(). */
- /* The stack pointer shouldn't be zero. */
- if (pcb->pcb_rsp == 0)
- return 0;
- pcb->pcb_rsp += 8;
- regcache->raw_supply (AMD64_RIP_REGNUM, &pcb->pcb_rip);
- regcache->raw_supply (AMD64_RBX_REGNUM, &pcb->pcb_rbx);
- regcache->raw_supply (AMD64_RSP_REGNUM, &pcb->pcb_rsp);
- regcache->raw_supply (AMD64_RBP_REGNUM, &pcb->pcb_rbp);
- regcache->raw_supply (12, &pcb->pcb_r12);
- regcache->raw_supply (13, &pcb->pcb_r13);
- regcache->raw_supply (14, &pcb->pcb_r14);
- regcache->raw_supply (15, &pcb->pcb_r15);
- #if (__FreeBSD_version < 800075) && (__FreeBSD_kernel_version < 800075)
- /* struct pcb provides the pcb_ds/pcb_es/pcb_fs/pcb_gs fields only
- up until __FreeBSD_version 800074: The removal of these fields
- occurred on 2009-04-01 while the __FreeBSD_version number was
- bumped to 800075 on 2009-04-06. So 800075 is the closest version
- number where we should not try to access these fields. */
- regcache->raw_supply (AMD64_DS_REGNUM, &pcb->pcb_ds);
- regcache->raw_supply (AMD64_ES_REGNUM, &pcb->pcb_es);
- regcache->raw_supply (AMD64_FS_REGNUM, &pcb->pcb_fs);
- regcache->raw_supply (AMD64_GS_REGNUM, &pcb->pcb_gs);
- #endif
- return 1;
- }
- /* Implement the read_description method. */
- const struct target_desc *
- amd64_fbsd_nat_target::read_description ()
- {
- #ifdef PT_GETXSTATE_INFO
- static int xsave_probed;
- static uint64_t xcr0;
- #endif
- struct reg regs;
- int is64;
- if (ptrace (PT_GETREGS, inferior_ptid.pid (),
- (PTRACE_TYPE_ARG3) ®s, 0) == -1)
- perror_with_name (_("Couldn't get registers"));
- is64 = (regs.r_cs == GSEL (GUCODE_SEL, SEL_UPL));
- #ifdef PT_GETXSTATE_INFO
- if (!xsave_probed)
- {
- struct ptrace_xstate_info info;
- if (ptrace (PT_GETXSTATE_INFO, inferior_ptid.pid (),
- (PTRACE_TYPE_ARG3) &info, sizeof (info)) == 0)
- {
- xsave_len = info.xsave_len;
- xcr0 = info.xsave_mask;
- }
- xsave_probed = 1;
- }
- if (xsave_len != 0)
- {
- if (is64)
- return amd64_target_description (xcr0, true);
- else
- return i386_target_description (xcr0, true);
- }
- #endif
- if (is64)
- return amd64_target_description (X86_XSTATE_SSE_MASK, true);
- else
- return i386_target_description (X86_XSTATE_SSE_MASK, true);
- }
- void _initialize_amd64fbsd_nat ();
- void
- _initialize_amd64fbsd_nat ()
- {
- add_inf_child_target (&the_amd64_fbsd_nat_target);
- /* Support debugging kernel virtual memory images. */
- bsd_kvm_add_target (amd64fbsd_supply_pcb);
- }
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