1 /* GNU/Linux/x86 specific low level interface, for the in-process
4 Copyright (C) 2010-2016 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "tracepoint.h"
24 #include "linux-x86-tdesc.h"
26 /* GDB register numbers. */
30 I386_EAX_REGNUM
, /* %eax */
31 I386_ECX_REGNUM
, /* %ecx */
32 I386_EDX_REGNUM
, /* %edx */
33 I386_EBX_REGNUM
, /* %ebx */
34 I386_ESP_REGNUM
, /* %esp */
35 I386_EBP_REGNUM
, /* %ebp */
36 I386_ESI_REGNUM
, /* %esi */
37 I386_EDI_REGNUM
, /* %edi */
38 I386_EIP_REGNUM
, /* %eip */
39 I386_EFLAGS_REGNUM
, /* %eflags */
40 I386_CS_REGNUM
, /* %cs */
41 I386_SS_REGNUM
, /* %ss */
42 I386_DS_REGNUM
, /* %ds */
43 I386_ES_REGNUM
, /* %es */
44 I386_FS_REGNUM
, /* %fs */
45 I386_GS_REGNUM
, /* %gs */
46 I386_ST0_REGNUM
/* %st(0) */
49 #define i386_num_regs 16
68 /* Mapping between the general-purpose registers in jump tracepoint
69 format and GDB's register array layout. */
71 static const int i386_ft_collect_regmap
[] =
73 FT_CR_EAX
* 4, FT_CR_ECX
* 4, FT_CR_EDX
* 4, FT_CR_EBX
* 4,
74 FT_CR_UESP
* 4, FT_CR_EBP
* 4, FT_CR_ESI
* 4, FT_CR_EDI
* 4,
75 FT_CR_EIP
* 4, FT_CR_EFL
* 4, FT_CR_CS
* 4, FT_CR_SS
* 4,
76 FT_CR_DS
* 4, FT_CR_ES
* 4, FT_CR_FS
* 4, FT_CR_GS
* 4
80 supply_fast_tracepoint_registers (struct regcache
*regcache
,
81 const unsigned char *buf
)
85 for (i
= 0; i
< i386_num_regs
; i
++)
89 if (i
>= I386_CS_REGNUM
&& i
<= I386_GS_REGNUM
)
90 regval
= *(short *) (((char *) buf
) + i386_ft_collect_regmap
[i
]);
92 regval
= *(int *) (((char *) buf
) + i386_ft_collect_regmap
[i
]);
94 supply_register (regcache
, i
, ®val
);
98 IP_AGENT_EXPORT_FUNC ULONGEST
99 gdb_agent_get_raw_reg (const unsigned char *raw_regs
, int regnum
)
101 /* This should maybe be allowed to return an error code, or perhaps
102 better, have the emit_reg detect this, and emit a constant zero,
105 if (regnum
> i386_num_regs
)
107 else if (regnum
>= I386_CS_REGNUM
&& regnum
<= I386_GS_REGNUM
)
108 return *(short *) (raw_regs
+ i386_ft_collect_regmap
[regnum
]);
110 return *(int *) (raw_regs
+ i386_ft_collect_regmap
[regnum
]);
115 #include <ust/processor.h>
117 /* "struct registers" is the UST object type holding the registers at
118 the time of the static tracepoint marker call. This doesn't
119 contain EIP, but we know what it must have been (the marker
122 #define ST_REGENTRY(REG) \
124 offsetof (struct registers, REG), \
125 sizeof (((struct registers *) NULL)->REG) \
132 } i386_st_collect_regmap
[] =
148 #define i386_NUM_ST_COLLECT_GREGS \
149 (sizeof (i386_st_collect_regmap) / sizeof (i386_st_collect_regmap[0]))
152 supply_static_tracepoint_registers (struct regcache
*regcache
,
153 const unsigned char *buf
,
157 unsigned int newpc
= pc
;
159 supply_register (regcache
, I386_EIP_REGNUM
, &newpc
);
161 for (i
= 0; i
< i386_NUM_ST_COLLECT_GREGS
; i
++)
162 if (i386_st_collect_regmap
[i
].offset
!= -1)
164 switch (i386_st_collect_regmap
[i
].size
)
167 supply_register (regcache
, i
,
169 + i386_st_collect_regmap
[i
].offset
);
174 = * (short *) (((char *) buf
)
175 + i386_st_collect_regmap
[i
].offset
);
177 supply_register (regcache
, i
, ®
);
181 internal_error (__FILE__
, __LINE__
, "unhandled register size: %d",
182 i386_st_collect_regmap
[i
].size
);
187 #endif /* HAVE_UST */
190 /* This is only needed because reg-i386-linux-lib.o references it. We
191 may use it proper at some point. */
192 const char *gdbserver_xmltarget
;
194 /* Attempt to allocate memory for trampolines in the first 64 KiB of
195 memory to enable smaller jump patches. */
198 initialize_fast_tracepoint_trampoline_buffer (void)
200 const CORE_ADDR buffer_end
= 64 * 1024;
201 /* Ensure that the buffer will be at least 1 KiB in size, which is
202 enough space for over 200 fast tracepoints. */
203 const int min_buffer_size
= 1024;
204 char buf
[IPA_BUFSIZ
];
205 CORE_ADDR mmap_min_addr
= buffer_end
+ 1;
206 ULONGEST buffer_size
;
207 FILE *f
= fopen ("/proc/sys/vm/mmap_min_addr", "r");
211 snprintf (buf
, sizeof (buf
), "mmap_min_addr open failed: %s",
213 set_trampoline_buffer_space (0, 0, buf
);
217 if (fgets (buf
, IPA_BUFSIZ
, f
))
218 sscanf (buf
, "%llu", &mmap_min_addr
);
222 buffer_size
= buffer_end
- mmap_min_addr
;
224 if (buffer_size
>= min_buffer_size
)
226 if (mmap ((void *) (uintptr_t) mmap_min_addr
, buffer_size
,
227 PROT_READ
| PROT_EXEC
| PROT_WRITE
,
228 MAP_FIXED
| MAP_PRIVATE
| MAP_ANONYMOUS
,
231 set_trampoline_buffer_space (mmap_min_addr
, buffer_end
, NULL
);
234 snprintf (buf
, IPA_BUFSIZ
, "low-64K-buffer mmap() failed: %s",
236 set_trampoline_buffer_space (0, 0, buf
);
241 snprintf (buf
, IPA_BUFSIZ
, "mmap_min_addr is %d, must be %d or less",
242 (int) mmap_min_addr
, (int) buffer_end
- min_buffer_size
);
243 set_trampoline_buffer_space (0, 0, buf
);
247 /* Return target_desc to use for IPA, given the tdesc index passed by
250 const struct target_desc
*
251 get_ipa_tdesc (int idx
)
256 return tdesc_i386_mmx_linux
;
258 return tdesc_i386_linux
;
260 return tdesc_i386_avx_linux
;
262 return tdesc_i386_mpx_linux
;
263 case X86_TDESC_AVX512
:
264 return tdesc_i386_avx512_linux
;
266 internal_error (__FILE__
, __LINE__
,
267 "unknown ipa tdesc index: %d", idx
);
268 return tdesc_i386_linux
;
273 initialize_low_tracepoint (void)
275 init_registers_i386_mmx_linux ();
276 init_registers_i386_linux ();
277 init_registers_i386_avx_linux ();
278 init_registers_i386_mpx_linux ();
279 init_registers_i386_avx512_linux ();
280 initialize_fast_tracepoint_trampoline_buffer ();