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