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/*
* Copyright (c) 2004 Marcel Moolenaar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "defs.h"
#include "frame-unwind.h"
#include "gdbcore.h"
#include "osabi.h"
#include "regcache.h"
#include "solib.h"
#include "stack.h"
#include "symtab.h"
#include "trad-frame.h"
#include "amd64-tdep.h"
#include "gdbsupport/x86-xstate.h"
#ifdef __amd64__
#include <machine/pcb.h>
#include <machine/frame.h>
#endif
#include "kgdb.h"
static const int amd64fbsd_pcb_offset[] = {
-1, /* %rax */
6 * 8, /* %rbx */
-1, /* %rcx */
-1, /* %rdx */
-1, /* %rsi */
-1, /* %rdi */
4 * 8, /* %rbp */
5 * 8, /* %rsp */
-1, /* %r8 ... */
-1,
-1,
-1,
3 * 8,
2 * 8,
1 * 8,
0 * 8, /* ... %r15 */
7 * 8, /* %rip */
-1, /* %eflags */
-1, /* %cs */
-1, /* %ss */
-1, /* %ds */
-1, /* %es */
-1, /* %fs */
-1 /* %gs */
};
#define CODE_SEL (4 << 3)
#define DATA_SEL (5 << 3)
static void
amd64fbsd_supply_pcb(struct regcache *regcache, CORE_ADDR pcb_addr)
{
gdb_byte buf[8];
int i;
memset(buf, 0, sizeof(buf));
/*
* XXX The PCB may have been swapped out. Supply a dummy %rip value
* so as to avoid triggering an exception during stack unwinding.
*/
regcache->raw_supply(AMD64_RIP_REGNUM, buf);
for (i = 0; i < ARRAY_SIZE (amd64fbsd_pcb_offset); i++)
if (amd64fbsd_pcb_offset[i] != -1) {
if (target_read_memory(pcb_addr + amd64fbsd_pcb_offset[i], buf,
sizeof buf) != 0)
continue;
regcache->raw_supply(i, buf);
}
regcache->raw_supply_unsigned(AMD64_CS_REGNUM, CODE_SEL);
regcache->raw_supply_unsigned(AMD64_SS_REGNUM, DATA_SEL);
}
static const int amd64fbsd_trapframe_offset[] = {
6 * 8, /* %rax */
7 * 8, /* %rbx */
3 * 8, /* %rcx */
2 * 8, /* %rdx */
1 * 8, /* %rsi */
0 * 8, /* %rdi */
8 * 8, /* %rbp */
22 * 8, /* %rsp */
4 * 8, /* %r8 ... */
5 * 8,
9 * 8,
10 * 8,
11 * 8,
12 * 8,
13 * 8,
14 * 8, /* ... %r15 */
19 * 8, /* %rip */
21 * 8, /* %eflags */
20 * 8, /* %cs */
23 * 8, /* %ss */
-1, /* %ds */
-1, /* %es */
-1, /* %fs */
-1 /* %gs */
};
#define TRAPFRAME_SIZE 192
static struct trad_frame_cache *
amd64fbsd_trapframe_cache (struct frame_info *this_frame, void **this_cache)
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
struct trad_frame_cache *cache;
CORE_ADDR addr, func, pc, sp;
const char *name;
int i;
if (*this_cache != NULL)
return ((struct trad_frame_cache *)*this_cache);
cache = trad_frame_cache_zalloc (this_frame);
*this_cache = cache;
func = get_frame_func (this_frame);
sp = get_frame_register_unsigned (this_frame, AMD64_RSP_REGNUM);
find_pc_partial_function (func, &name, NULL, NULL);
if (strcmp(name, "fork_trampoline") == 0 && get_frame_pc (this_frame) == func)
{
/* fork_exit hasn't been called (kthread has never run), so %rsp
in the pcb points to the trapframe. GDB has auto-adjusted
%rsp for this frame to account for the "call" into
fork_trampoline, so "undo" the adjustment. */
sp += 8;
}
for (i = 0; i < ARRAY_SIZE (amd64fbsd_trapframe_offset); i++)
if (amd64fbsd_trapframe_offset[i] != -1)
trad_frame_set_reg_addr (cache, i, sp + amd64fbsd_trapframe_offset[i]);
/* Read %rip from trap frame. */
addr = sp + amd64fbsd_trapframe_offset[AMD64_RIP_REGNUM];
pc = read_memory_unsigned_integer (addr, 8, byte_order);
if (pc == 0 && strcmp(name, "fork_trampoline") == 0)
{
/* Initial frame of a kthread; terminate backtrace. */
trad_frame_set_id (cache, outer_frame_id);
}
else
{
/* Construct the frame ID using the function start. */
trad_frame_set_id (cache, frame_id_build (sp + TRAPFRAME_SIZE, func));
}
return cache;
}
static void
amd64fbsd_trapframe_this_id (struct frame_info *this_frame,
void **this_cache, struct frame_id *this_id)
{
struct trad_frame_cache *cache =
amd64fbsd_trapframe_cache (this_frame, this_cache);
trad_frame_get_id (cache, this_id);
}
static struct value *
amd64fbsd_trapframe_prev_register (struct frame_info *this_frame,
void **this_cache, int regnum)
{
struct trad_frame_cache *cache =
amd64fbsd_trapframe_cache (this_frame, this_cache);
return trad_frame_get_register (cache, this_frame, regnum);
}
static int
amd64fbsd_trapframe_sniffer (const struct frame_unwind *self,
struct frame_info *this_frame,
void **this_prologue_cache)
{
const char *name;
find_pc_partial_function (get_frame_func (this_frame), &name, NULL, NULL);
return (name && ((strcmp (name, "calltrap") == 0)
|| (strcmp (name, "fast_syscall_common") == 0)
|| (strcmp (name, "fork_trampoline") == 0)
|| (strcmp (name, "mchk_calltrap") == 0)
|| (strcmp (name, "nmi_calltrap") == 0)
|| (name[0] == 'X' && name[1] != '_')));
}
static const struct frame_unwind amd64fbsd_trapframe_unwind = {
SIGTRAMP_FRAME,
default_frame_unwind_stop_reason,
amd64fbsd_trapframe_this_id,
amd64fbsd_trapframe_prev_register,
NULL,
amd64fbsd_trapframe_sniffer
};
static void
amd64fbsd_kernel_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
{
amd64_init_abi(info, gdbarch,
amd64_target_description (X86_XSTATE_SSE_MASK, true));
frame_unwind_prepend_unwinder(gdbarch, &amd64fbsd_trapframe_unwind);
set_solib_ops(gdbarch, &kld_so_ops);
fbsd_vmcore_set_supply_pcb(gdbarch, amd64fbsd_supply_pcb);
fbsd_vmcore_set_cpu_pcb_addr(gdbarch, kgdb_trgt_stop_pcb);
}
void _initialize_amd64_kgdb_tdep(void);
void
_initialize_amd64_kgdb_tdep(void)
{
gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
GDB_OSABI_FREEBSD_KERNEL, amd64fbsd_kernel_init_abi);
#ifdef __amd64__
gdb_assert(offsetof(struct pcb, pcb_rbx)
== amd64fbsd_pcb_offset[AMD64_RBX_REGNUM]);
gdb_assert(offsetof(struct pcb, pcb_rbp)
== amd64fbsd_pcb_offset[AMD64_RBP_REGNUM]);
gdb_assert(offsetof(struct pcb, pcb_rsp)
== amd64fbsd_pcb_offset[AMD64_RSP_REGNUM]);
gdb_assert(offsetof(struct pcb, pcb_r12)
== amd64fbsd_pcb_offset[AMD64_R12_REGNUM]);
gdb_assert(offsetof(struct pcb, pcb_r13)
== amd64fbsd_pcb_offset[AMD64_R13_REGNUM]);
gdb_assert(offsetof(struct pcb, pcb_r14)
== amd64fbsd_pcb_offset[AMD64_R14_REGNUM]);
gdb_assert(offsetof(struct pcb, pcb_r15)
== amd64fbsd_pcb_offset[AMD64_R15_REGNUM]);
gdb_assert(offsetof(struct pcb, pcb_rip)
== amd64fbsd_pcb_offset[AMD64_RIP_REGNUM]);
gdb_assert(CODE_SEL == GSEL(GCODE_SEL, SEL_KPL));
gdb_assert(DATA_SEL == GSEL(GDATA_SEL, SEL_KPL));
gdb_assert(sizeof(struct trapframe) == TRAPFRAME_SIZE);
gdb_assert(offsetof(struct trapframe, tf_rax)
== amd64fbsd_trapframe_offset[AMD64_RAX_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_rbx)
== amd64fbsd_trapframe_offset[AMD64_RBX_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_rcx)
== amd64fbsd_trapframe_offset[AMD64_RCX_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_rdx)
== amd64fbsd_trapframe_offset[AMD64_RDX_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_rsi)
== amd64fbsd_trapframe_offset[AMD64_RSI_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_rdi)
== amd64fbsd_trapframe_offset[AMD64_RDI_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_rbp)
== amd64fbsd_trapframe_offset[AMD64_RBP_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_rsp)
== amd64fbsd_trapframe_offset[AMD64_RSP_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_r8)
== amd64fbsd_trapframe_offset[AMD64_R8_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_r9)
== amd64fbsd_trapframe_offset[AMD64_R9_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_r10)
== amd64fbsd_trapframe_offset[AMD64_R10_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_r11)
== amd64fbsd_trapframe_offset[AMD64_R11_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_r12)
== amd64fbsd_trapframe_offset[AMD64_R12_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_r13)
== amd64fbsd_trapframe_offset[AMD64_R13_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_r14)
== amd64fbsd_trapframe_offset[AMD64_R14_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_r15)
== amd64fbsd_trapframe_offset[AMD64_R15_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_rip)
== amd64fbsd_trapframe_offset[AMD64_RIP_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_rflags)
== amd64fbsd_trapframe_offset[AMD64_EFLAGS_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_cs)
== amd64fbsd_trapframe_offset[AMD64_CS_REGNUM]);
gdb_assert(offsetof(struct trapframe, tf_ss)
== amd64fbsd_trapframe_offset[AMD64_SS_REGNUM]);
#endif
}
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