258 lines
6.7 KiB
C
258 lines
6.7 KiB
C
/* GNU/Linux/x86 specific low level interface, for the in-process
|
|
agent library for GDB.
|
|
|
|
Copyright (C) 2010-2015 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 "server.h"
|
|
#include <stdint.h>
|
|
#include <sys/mman.h>
|
|
#include "tracepoint.h"
|
|
|
|
/* GDB register numbers. */
|
|
|
|
enum i386_gdb_regnum
|
|
{
|
|
I386_EAX_REGNUM, /* %eax */
|
|
I386_ECX_REGNUM, /* %ecx */
|
|
I386_EDX_REGNUM, /* %edx */
|
|
I386_EBX_REGNUM, /* %ebx */
|
|
I386_ESP_REGNUM, /* %esp */
|
|
I386_EBP_REGNUM, /* %ebp */
|
|
I386_ESI_REGNUM, /* %esi */
|
|
I386_EDI_REGNUM, /* %edi */
|
|
I386_EIP_REGNUM, /* %eip */
|
|
I386_EFLAGS_REGNUM, /* %eflags */
|
|
I386_CS_REGNUM, /* %cs */
|
|
I386_SS_REGNUM, /* %ss */
|
|
I386_DS_REGNUM, /* %ds */
|
|
I386_ES_REGNUM, /* %es */
|
|
I386_FS_REGNUM, /* %fs */
|
|
I386_GS_REGNUM, /* %gs */
|
|
I386_ST0_REGNUM /* %st(0) */
|
|
};
|
|
|
|
#define i386_num_regs 16
|
|
|
|
/* Defined in auto-generated file i386-linux.c. */
|
|
void init_registers_i386_linux (void);
|
|
extern const struct target_desc *tdesc_i386_linux;
|
|
|
|
#define FT_CR_EAX 15
|
|
#define FT_CR_ECX 14
|
|
#define FT_CR_EDX 13
|
|
#define FT_CR_EBX 12
|
|
#define FT_CR_UESP 11
|
|
#define FT_CR_EBP 10
|
|
#define FT_CR_ESI 9
|
|
#define FT_CR_EDI 8
|
|
#define FT_CR_EIP 7
|
|
#define FT_CR_EFL 6
|
|
#define FT_CR_DS 5
|
|
#define FT_CR_ES 4
|
|
#define FT_CR_FS 3
|
|
#define FT_CR_GS 2
|
|
#define FT_CR_SS 1
|
|
#define FT_CR_CS 0
|
|
|
|
/* Mapping between the general-purpose registers in jump tracepoint
|
|
format and GDB's register array layout. */
|
|
|
|
static const int i386_ft_collect_regmap[] =
|
|
{
|
|
FT_CR_EAX * 4, FT_CR_ECX * 4, FT_CR_EDX * 4, FT_CR_EBX * 4,
|
|
FT_CR_UESP * 4, FT_CR_EBP * 4, FT_CR_ESI * 4, FT_CR_EDI * 4,
|
|
FT_CR_EIP * 4, FT_CR_EFL * 4, FT_CR_CS * 4, FT_CR_SS * 4,
|
|
FT_CR_DS * 4, FT_CR_ES * 4, FT_CR_FS * 4, FT_CR_GS * 4
|
|
};
|
|
|
|
void
|
|
supply_fast_tracepoint_registers (struct regcache *regcache,
|
|
const unsigned char *buf)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < i386_num_regs; i++)
|
|
{
|
|
int regval;
|
|
|
|
if (i >= I386_CS_REGNUM && i <= I386_GS_REGNUM)
|
|
regval = *(short *) (((char *) buf) + i386_ft_collect_regmap[i]);
|
|
else
|
|
regval = *(int *) (((char *) buf) + i386_ft_collect_regmap[i]);
|
|
|
|
supply_register (regcache, i, ®val);
|
|
}
|
|
}
|
|
|
|
ULONGEST __attribute__ ((visibility("default"), used))
|
|
gdb_agent_get_raw_reg (unsigned char *raw_regs, int regnum)
|
|
{
|
|
/* This should maybe be allowed to return an error code, or perhaps
|
|
better, have the emit_reg detect this, and emit a constant zero,
|
|
or something. */
|
|
|
|
if (regnum > i386_num_regs)
|
|
return 0;
|
|
else if (regnum >= I386_CS_REGNUM && regnum <= I386_GS_REGNUM)
|
|
return *(short *) (raw_regs + i386_ft_collect_regmap[regnum]);
|
|
else
|
|
return *(int *) (raw_regs + i386_ft_collect_regmap[regnum]);
|
|
}
|
|
|
|
#ifdef HAVE_UST
|
|
|
|
#include <ust/processor.h>
|
|
|
|
/* "struct registers" is the UST object type holding the registers at
|
|
the time of the static tracepoint marker call. This doesn't
|
|
contain EIP, but we know what it must have been (the marker
|
|
address). */
|
|
|
|
#define ST_REGENTRY(REG) \
|
|
{ \
|
|
offsetof (struct registers, REG), \
|
|
sizeof (((struct registers *) NULL)->REG) \
|
|
}
|
|
|
|
static struct
|
|
{
|
|
int offset;
|
|
int size;
|
|
} i386_st_collect_regmap[] =
|
|
{
|
|
ST_REGENTRY(eax),
|
|
ST_REGENTRY(ecx),
|
|
ST_REGENTRY(edx),
|
|
ST_REGENTRY(ebx),
|
|
ST_REGENTRY(esp),
|
|
ST_REGENTRY(ebp),
|
|
ST_REGENTRY(esi),
|
|
ST_REGENTRY(edi),
|
|
{ -1, 0 }, /* eip */
|
|
ST_REGENTRY(eflags),
|
|
ST_REGENTRY(cs),
|
|
ST_REGENTRY(ss),
|
|
};
|
|
|
|
#define i386_NUM_ST_COLLECT_GREGS \
|
|
(sizeof (i386_st_collect_regmap) / sizeof (i386_st_collect_regmap[0]))
|
|
|
|
void
|
|
supply_static_tracepoint_registers (struct regcache *regcache,
|
|
const unsigned char *buf,
|
|
CORE_ADDR pc)
|
|
{
|
|
int i;
|
|
unsigned int newpc = pc;
|
|
|
|
supply_register (regcache, I386_EIP_REGNUM, &newpc);
|
|
|
|
for (i = 0; i < i386_NUM_ST_COLLECT_GREGS; i++)
|
|
if (i386_st_collect_regmap[i].offset != -1)
|
|
{
|
|
switch (i386_st_collect_regmap[i].size)
|
|
{
|
|
case 4:
|
|
supply_register (regcache, i,
|
|
((char *) buf)
|
|
+ i386_st_collect_regmap[i].offset);
|
|
break;
|
|
case 2:
|
|
{
|
|
unsigned long reg
|
|
= * (short *) (((char *) buf)
|
|
+ i386_st_collect_regmap[i].offset);
|
|
reg &= 0xffff;
|
|
supply_register (regcache, i, ®);
|
|
}
|
|
break;
|
|
default:
|
|
internal_error (__FILE__, __LINE__, "unhandled register size: %d",
|
|
i386_st_collect_regmap[i].size);
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif /* HAVE_UST */
|
|
|
|
|
|
/* This is only needed because reg-i386-linux-lib.o references it. We
|
|
may use it proper at some point. */
|
|
const char *gdbserver_xmltarget;
|
|
|
|
/* Attempt to allocate memory for trampolines in the first 64 KiB of
|
|
memory to enable smaller jump patches. */
|
|
|
|
static void
|
|
initialize_fast_tracepoint_trampoline_buffer (void)
|
|
{
|
|
const CORE_ADDR buffer_end = 64 * 1024;
|
|
/* Ensure that the buffer will be at least 1 KiB in size, which is
|
|
enough space for over 200 fast tracepoints. */
|
|
const int min_buffer_size = 1024;
|
|
char buf[IPA_BUFSIZ];
|
|
CORE_ADDR mmap_min_addr = buffer_end + 1;
|
|
ULONGEST buffer_size;
|
|
FILE *f = fopen ("/proc/sys/vm/mmap_min_addr", "r");
|
|
|
|
if (!f)
|
|
{
|
|
snprintf (buf, sizeof (buf), "mmap_min_addr open failed: %s",
|
|
strerror (errno));
|
|
set_trampoline_buffer_space (0, 0, buf);
|
|
return;
|
|
}
|
|
|
|
if (fgets (buf, IPA_BUFSIZ, f))
|
|
sscanf (buf, "%llu", &mmap_min_addr);
|
|
|
|
fclose (f);
|
|
|
|
buffer_size = buffer_end - mmap_min_addr;
|
|
|
|
if (buffer_size >= min_buffer_size)
|
|
{
|
|
if (mmap ((void *) (uintptr_t) mmap_min_addr, buffer_size,
|
|
PROT_READ | PROT_EXEC | PROT_WRITE,
|
|
MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS,
|
|
-1, 0)
|
|
!= MAP_FAILED)
|
|
set_trampoline_buffer_space (mmap_min_addr, buffer_end, NULL);
|
|
else
|
|
{
|
|
snprintf (buf, IPA_BUFSIZ, "low-64K-buffer mmap() failed: %s",
|
|
strerror (errno));
|
|
set_trampoline_buffer_space (0, 0, buf);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
snprintf (buf, IPA_BUFSIZ, "mmap_min_addr is %d, must be %d or less",
|
|
(int) mmap_min_addr, (int) buffer_end - min_buffer_size);
|
|
set_trampoline_buffer_space (0, 0, buf);
|
|
}
|
|
}
|
|
|
|
void
|
|
initialize_low_tracepoint (void)
|
|
{
|
|
init_registers_i386_linux ();
|
|
ipa_tdesc = tdesc_i386_linux;
|
|
initialize_fast_tracepoint_trampoline_buffer ();
|
|
}
|