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"
25 /* GDB register numbers. */
29 I386_EAX_REGNUM
, /* %eax */
30 I386_ECX_REGNUM
, /* %ecx */
31 I386_EDX_REGNUM
, /* %edx */
32 I386_EBX_REGNUM
, /* %ebx */
33 I386_ESP_REGNUM
, /* %esp */
34 I386_EBP_REGNUM
, /* %ebp */
35 I386_ESI_REGNUM
, /* %esi */
36 I386_EDI_REGNUM
, /* %edi */
37 I386_EIP_REGNUM
, /* %eip */
38 I386_EFLAGS_REGNUM
, /* %eflags */
39 I386_CS_REGNUM
, /* %cs */
40 I386_SS_REGNUM
, /* %ss */
41 I386_DS_REGNUM
, /* %ds */
42 I386_ES_REGNUM
, /* %es */
43 I386_FS_REGNUM
, /* %fs */
44 I386_GS_REGNUM
, /* %gs */
45 I386_ST0_REGNUM
/* %st(0) */
48 #define i386_num_regs 16
50 /* Defined in auto-generated file i386-linux.c. */
51 void init_registers_i386_linux (void);
52 extern const struct target_desc
*tdesc_i386_linux
;
71 /* Mapping between the general-purpose registers in jump tracepoint
72 format and GDB's register array layout. */
74 static const int i386_ft_collect_regmap
[] =
76 FT_CR_EAX
* 4, FT_CR_ECX
* 4, FT_CR_EDX
* 4, FT_CR_EBX
* 4,
77 FT_CR_UESP
* 4, FT_CR_EBP
* 4, FT_CR_ESI
* 4, FT_CR_EDI
* 4,
78 FT_CR_EIP
* 4, FT_CR_EFL
* 4, FT_CR_CS
* 4, FT_CR_SS
* 4,
79 FT_CR_DS
* 4, FT_CR_ES
* 4, FT_CR_FS
* 4, FT_CR_GS
* 4
83 supply_fast_tracepoint_registers (struct regcache
*regcache
,
84 const unsigned char *buf
)
88 for (i
= 0; i
< i386_num_regs
; i
++)
92 if (i
>= I386_CS_REGNUM
&& i
<= I386_GS_REGNUM
)
93 regval
= *(short *) (((char *) buf
) + i386_ft_collect_regmap
[i
]);
95 regval
= *(int *) (((char *) buf
) + i386_ft_collect_regmap
[i
]);
97 supply_register (regcache
, i
, ®val
);
101 IP_AGENT_EXPORT_FUNC ULONGEST
102 gdb_agent_get_raw_reg (const unsigned char *raw_regs
, int regnum
)
104 /* This should maybe be allowed to return an error code, or perhaps
105 better, have the emit_reg detect this, and emit a constant zero,
108 if (regnum
> i386_num_regs
)
110 else if (regnum
>= I386_CS_REGNUM
&& regnum
<= I386_GS_REGNUM
)
111 return *(short *) (raw_regs
+ i386_ft_collect_regmap
[regnum
]);
113 return *(int *) (raw_regs
+ i386_ft_collect_regmap
[regnum
]);
118 #include <ust/processor.h>
120 /* "struct registers" is the UST object type holding the registers at
121 the time of the static tracepoint marker call. This doesn't
122 contain EIP, but we know what it must have been (the marker
125 #define ST_REGENTRY(REG) \
127 offsetof (struct registers, REG), \
128 sizeof (((struct registers *) NULL)->REG) \
135 } i386_st_collect_regmap
[] =
151 #define i386_NUM_ST_COLLECT_GREGS \
152 (sizeof (i386_st_collect_regmap) / sizeof (i386_st_collect_regmap[0]))
155 supply_static_tracepoint_registers (struct regcache
*regcache
,
156 const unsigned char *buf
,
160 unsigned int newpc
= pc
;
162 supply_register (regcache
, I386_EIP_REGNUM
, &newpc
);
164 for (i
= 0; i
< i386_NUM_ST_COLLECT_GREGS
; i
++)
165 if (i386_st_collect_regmap
[i
].offset
!= -1)
167 switch (i386_st_collect_regmap
[i
].size
)
170 supply_register (regcache
, i
,
172 + i386_st_collect_regmap
[i
].offset
);
177 = * (short *) (((char *) buf
)
178 + i386_st_collect_regmap
[i
].offset
);
180 supply_register (regcache
, i
, ®
);
184 internal_error (__FILE__
, __LINE__
, "unhandled register size: %d",
185 i386_st_collect_regmap
[i
].size
);
190 #endif /* HAVE_UST */
193 /* This is only needed because reg-i386-linux-lib.o references it. We
194 may use it proper at some point. */
195 const char *gdbserver_xmltarget
;
197 /* Attempt to allocate memory for trampolines in the first 64 KiB of
198 memory to enable smaller jump patches. */
201 initialize_fast_tracepoint_trampoline_buffer (void)
203 const CORE_ADDR buffer_end
= 64 * 1024;
204 /* Ensure that the buffer will be at least 1 KiB in size, which is
205 enough space for over 200 fast tracepoints. */
206 const int min_buffer_size
= 1024;
207 char buf
[IPA_BUFSIZ
];
208 CORE_ADDR mmap_min_addr
= buffer_end
+ 1;
209 ULONGEST buffer_size
;
210 FILE *f
= fopen ("/proc/sys/vm/mmap_min_addr", "r");
214 snprintf (buf
, sizeof (buf
), "mmap_min_addr open failed: %s",
216 set_trampoline_buffer_space (0, 0, buf
);
220 if (fgets (buf
, IPA_BUFSIZ
, f
))
221 sscanf (buf
, "%llu", &mmap_min_addr
);
225 buffer_size
= buffer_end
- mmap_min_addr
;
227 if (buffer_size
>= min_buffer_size
)
229 if (mmap ((void *) (uintptr_t) mmap_min_addr
, buffer_size
,
230 PROT_READ
| PROT_EXEC
| PROT_WRITE
,
231 MAP_FIXED
| MAP_PRIVATE
| MAP_ANONYMOUS
,
234 set_trampoline_buffer_space (mmap_min_addr
, buffer_end
, NULL
);
237 snprintf (buf
, IPA_BUFSIZ
, "low-64K-buffer mmap() failed: %s",
239 set_trampoline_buffer_space (0, 0, buf
);
244 snprintf (buf
, IPA_BUFSIZ
, "mmap_min_addr is %d, must be %d or less",
245 (int) mmap_min_addr
, (int) buffer_end
- min_buffer_size
);
246 set_trampoline_buffer_space (0, 0, buf
);
251 initialize_low_tracepoint (void)
253 init_registers_i386_linux ();
254 ipa_tdesc
= tdesc_i386_linux
;
255 initialize_fast_tracepoint_trampoline_buffer ();