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309 lines
9.0 KiB
C
309 lines
9.0 KiB
C
/* Native-dependent code for FreeBSD/amd64.
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Copyright (C) 2003-2020 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 "inferior.h"
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#include "regcache.h"
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#include "target.h"
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <sys/sysctl.h>
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#include <sys/user.h>
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#include <machine/reg.h>
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#include "fbsd-nat.h"
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#include "amd64-tdep.h"
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#include "amd64-nat.h"
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#include "amd64-bsd-nat.h"
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#include "x86-nat.h"
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#include "gdbsupport/x86-xstate.h"
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class amd64_fbsd_nat_target final
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: public amd64_bsd_nat_target<fbsd_nat_target>
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{
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public:
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/* Add some extra features to the common *BSD/amd64 target. */
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const struct target_desc *read_description () override;
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#if defined(HAVE_PT_GETDBREGS) && defined(USE_SIGTRAP_SIGINFO)
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bool supports_stopped_by_hw_breakpoint () override;
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#endif
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};
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static amd64_fbsd_nat_target the_amd64_fbsd_nat_target;
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/* Offset in `struct reg' where MEMBER is stored. */
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#define REG_OFFSET(member) offsetof (struct reg, member)
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/* At amd64fbsd64_r_reg_offset[REGNUM] you'll find the offset in
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`struct reg' location where the GDB register REGNUM is stored.
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Unsupported registers are marked with `-1'. */
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static int amd64fbsd64_r_reg_offset[] =
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{
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REG_OFFSET (r_rax),
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REG_OFFSET (r_rbx),
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REG_OFFSET (r_rcx),
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REG_OFFSET (r_rdx),
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REG_OFFSET (r_rsi),
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REG_OFFSET (r_rdi),
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REG_OFFSET (r_rbp),
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REG_OFFSET (r_rsp),
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REG_OFFSET (r_r8),
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REG_OFFSET (r_r9),
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REG_OFFSET (r_r10),
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REG_OFFSET (r_r11),
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REG_OFFSET (r_r12),
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REG_OFFSET (r_r13),
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REG_OFFSET (r_r14),
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REG_OFFSET (r_r15),
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REG_OFFSET (r_rip),
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REG_OFFSET (r_rflags),
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REG_OFFSET (r_cs),
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REG_OFFSET (r_ss),
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-1,
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-1,
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-1,
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-1
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};
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/* Mapping between the general-purpose registers in FreeBSD/amd64
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`struct reg' format and GDB's register cache layout for
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FreeBSD/i386.
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Note that most FreeBSD/amd64 registers are 64-bit, while the
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FreeBSD/i386 registers are all 32-bit, but since we're
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little-endian we get away with that. */
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/* From <machine/reg.h>. */
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static int amd64fbsd32_r_reg_offset[I386_NUM_GREGS] =
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{
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14 * 8, 13 * 8, /* %eax, %ecx */
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12 * 8, 11 * 8, /* %edx, %ebx */
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20 * 8, 10 * 8, /* %esp, %ebp */
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9 * 8, 8 * 8, /* %esi, %edi */
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17 * 8, 19 * 8, /* %eip, %eflags */
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18 * 8, 21 * 8, /* %cs, %ss */
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-1, -1, -1, -1 /* %ds, %es, %fs, %gs */
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};
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/* Support for debugging kernel virtual memory images. */
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#include <machine/pcb.h>
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#include <osreldate.h>
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#include "bsd-kvm.h"
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static int
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amd64fbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
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{
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/* The following is true for FreeBSD 5.2:
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The pcb contains %rip, %rbx, %rsp, %rbp, %r12, %r13, %r14, %r15,
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%ds, %es, %fs and %gs. This accounts for all callee-saved
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registers specified by the psABI and then some. Here %esp
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contains the stack pointer at the point just after the call to
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cpu_switch(). From this information we reconstruct the register
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state as it would like when we just returned from cpu_switch(). */
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/* The stack pointer shouldn't be zero. */
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if (pcb->pcb_rsp == 0)
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return 0;
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pcb->pcb_rsp += 8;
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regcache->raw_supply (AMD64_RIP_REGNUM, &pcb->pcb_rip);
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regcache->raw_supply (AMD64_RBX_REGNUM, &pcb->pcb_rbx);
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regcache->raw_supply (AMD64_RSP_REGNUM, &pcb->pcb_rsp);
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regcache->raw_supply (AMD64_RBP_REGNUM, &pcb->pcb_rbp);
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regcache->raw_supply (12, &pcb->pcb_r12);
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regcache->raw_supply (13, &pcb->pcb_r13);
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regcache->raw_supply (14, &pcb->pcb_r14);
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regcache->raw_supply (15, &pcb->pcb_r15);
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#if (__FreeBSD_version < 800075) && (__FreeBSD_kernel_version < 800075)
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/* struct pcb provides the pcb_ds/pcb_es/pcb_fs/pcb_gs fields only
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up until __FreeBSD_version 800074: The removal of these fields
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occurred on 2009-04-01 while the __FreeBSD_version number was
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bumped to 800075 on 2009-04-06. So 800075 is the closest version
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number where we should not try to access these fields. */
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regcache->raw_supply (AMD64_DS_REGNUM, &pcb->pcb_ds);
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regcache->raw_supply (AMD64_ES_REGNUM, &pcb->pcb_es);
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regcache->raw_supply (AMD64_FS_REGNUM, &pcb->pcb_fs);
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regcache->raw_supply (AMD64_GS_REGNUM, &pcb->pcb_gs);
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#endif
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return 1;
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}
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/* Implement the read_description method. */
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const struct target_desc *
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amd64_fbsd_nat_target::read_description ()
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{
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#ifdef PT_GETXSTATE_INFO
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static int xsave_probed;
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static uint64_t xcr0;
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#endif
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struct reg regs;
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int is64;
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if (ptrace (PT_GETREGS, inferior_ptid.pid (),
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(PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't get registers"));
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is64 = (regs.r_cs == GSEL (GUCODE_SEL, SEL_UPL));
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#ifdef PT_GETXSTATE_INFO
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if (!xsave_probed)
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{
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struct ptrace_xstate_info info;
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if (ptrace (PT_GETXSTATE_INFO, inferior_ptid.pid (),
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(PTRACE_TYPE_ARG3) &info, sizeof (info)) == 0)
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{
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x86bsd_xsave_len = info.xsave_len;
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xcr0 = info.xsave_mask;
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}
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xsave_probed = 1;
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}
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if (x86bsd_xsave_len != 0)
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{
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if (is64)
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return amd64_target_description (xcr0, true);
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else
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return i386_target_description (xcr0, true);
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}
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#endif
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if (is64)
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return amd64_target_description (X86_XSTATE_SSE_MASK, true);
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else
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return i386_target_description (X86_XSTATE_SSE_MASK, true);
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}
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#if defined(HAVE_PT_GETDBREGS) && defined(USE_SIGTRAP_SIGINFO)
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/* Implement the supports_stopped_by_hw_breakpoints method. */
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bool
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amd64_fbsd_nat_target::supports_stopped_by_hw_breakpoint ()
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{
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return true;
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}
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#endif
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void
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_initialize_amd64fbsd_nat (void)
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{
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int offset;
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amd64_native_gregset32_reg_offset = amd64fbsd32_r_reg_offset;
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amd64_native_gregset64_reg_offset = amd64fbsd64_r_reg_offset;
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add_inf_child_target (&the_amd64_fbsd_nat_target);
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/* Support debugging kernel virtual memory images. */
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bsd_kvm_add_target (amd64fbsd_supply_pcb);
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/* To support the recognition of signal handlers, i386-bsd-tdep.c
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hardcodes some constants. Inclusion of this file means that we
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are compiling a native debugger, which means that we can use the
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system header files and sysctl(3) to get at the relevant
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information. */
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#define SC_REG_OFFSET amd64fbsd_sc_reg_offset
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/* We only check the program counter, stack pointer and frame
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pointer since these members of `struct sigcontext' are essential
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for providing backtraces. */
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#define SC_RIP_OFFSET SC_REG_OFFSET[AMD64_RIP_REGNUM]
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#define SC_RSP_OFFSET SC_REG_OFFSET[AMD64_RSP_REGNUM]
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#define SC_RBP_OFFSET SC_REG_OFFSET[AMD64_RBP_REGNUM]
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/* Override the default value for the offset of the program counter
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in the sigcontext structure. */
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offset = offsetof (struct sigcontext, sc_rip);
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if (SC_RIP_OFFSET != offset)
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{
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warning (_("\
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offsetof (struct sigcontext, sc_rip) yields %d instead of %d.\n\
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Please report this to <bug-gdb@gnu.org>."),
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offset, SC_RIP_OFFSET);
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}
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SC_RIP_OFFSET = offset;
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/* Likewise for the stack pointer. */
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offset = offsetof (struct sigcontext, sc_rsp);
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if (SC_RSP_OFFSET != offset)
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{
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warning (_("\
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offsetof (struct sigcontext, sc_rsp) yields %d instead of %d.\n\
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Please report this to <bug-gdb@gnu.org>."),
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offset, SC_RSP_OFFSET);
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}
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SC_RSP_OFFSET = offset;
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/* And the frame pointer. */
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offset = offsetof (struct sigcontext, sc_rbp);
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if (SC_RBP_OFFSET != offset)
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{
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warning (_("\
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offsetof (struct sigcontext, sc_rbp) yields %d instead of %d.\n\
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Please report this to <bug-gdb@gnu.org>."),
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offset, SC_RBP_OFFSET);
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}
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SC_RBP_OFFSET = offset;
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#ifdef KERN_PROC_SIGTRAMP
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/* Normally signal frames are detected via amd64fbsd_sigtramp_p.
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However, FreeBSD 9.2 through 10.1 do not include the page holding
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the signal code in core dumps. These releases do provide a
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kern.proc.sigtramp.<pid> sysctl that returns the location of the
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signal trampoline for a running process. We fetch the location
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of the current (gdb) process and use this to identify signal
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frames in core dumps from these releases. Note that this only
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works for core dumps of 64-bit (FreeBSD/amd64) processes and does
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not handle core dumps of 32-bit (FreeBSD/i386) processes. */
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{
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int mib[4];
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struct kinfo_sigtramp kst;
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size_t len;
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROC;
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mib[2] = KERN_PROC_SIGTRAMP;
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mib[3] = getpid ();
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len = sizeof (kst);
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if (sysctl (mib, 4, &kst, &len, NULL, 0) == 0)
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{
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amd64fbsd_sigtramp_start_addr = (uintptr_t) kst.ksigtramp_start;
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amd64fbsd_sigtramp_end_addr = (uintptr_t) kst.ksigtramp_end;
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}
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}
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#endif
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}
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