1 /* GNU/Linux/x86 specific low level interface, for the in-process
4 Copyright (C) 2010-2014 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/>. */
24 #include "tracepoint.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
51 /* Defined in auto-generated file i386-linux.c. */
52 void init_registers_i386_linux (void);
53 extern const struct target_desc
*tdesc_i386_linux
;
72 /* Mapping between the general-purpose registers in jump tracepoint
73 format and GDB's register array layout. */
75 static const int i386_ft_collect_regmap
[] =
77 FT_CR_EAX
* 4, FT_CR_ECX
* 4, FT_CR_EDX
* 4, FT_CR_EBX
* 4,
78 FT_CR_UESP
* 4, FT_CR_EBP
* 4, FT_CR_ESI
* 4, FT_CR_EDI
* 4,
79 FT_CR_EIP
* 4, FT_CR_EFL
* 4, FT_CR_CS
* 4, FT_CR_SS
* 4,
80 FT_CR_DS
* 4, FT_CR_ES
* 4, FT_CR_FS
* 4, FT_CR_GS
* 4
84 supply_fast_tracepoint_registers (struct regcache
*regcache
,
85 const unsigned char *buf
)
89 for (i
= 0; i
< i386_num_regs
; i
++)
93 if (i
>= I386_CS_REGNUM
&& i
<= I386_GS_REGNUM
)
94 regval
= *(short *) (((char *) buf
) + i386_ft_collect_regmap
[i
]);
96 regval
= *(int *) (((char *) buf
) + i386_ft_collect_regmap
[i
]);
98 supply_register (regcache
, i
, ®val
);
102 ULONGEST
__attribute__ ((visibility("default"), used
))
103 gdb_agent_get_raw_reg (unsigned char *raw_regs
, int regnum
)
105 /* This should maybe be allowed to return an error code, or perhaps
106 better, have the emit_reg detect this, and emit a constant zero,
109 if (regnum
> i386_num_regs
)
111 else if (regnum
>= I386_CS_REGNUM
&& regnum
<= I386_GS_REGNUM
)
112 return *(short *) (raw_regs
+ i386_ft_collect_regmap
[regnum
]);
114 return *(int *) (raw_regs
+ i386_ft_collect_regmap
[regnum
]);
119 #include <ust/processor.h>
121 /* "struct registers" is the UST object type holding the registers at
122 the time of the static tracepoint marker call. This doesn't
123 contain EIP, but we know what it must have been (the marker
126 #define ST_REGENTRY(REG) \
128 offsetof (struct registers, REG), \
129 sizeof (((struct registers *) NULL)->REG) \
136 } i386_st_collect_regmap
[] =
152 #define i386_NUM_ST_COLLECT_GREGS \
153 (sizeof (i386_st_collect_regmap) / sizeof (i386_st_collect_regmap[0]))
156 supply_static_tracepoint_registers (struct regcache
*regcache
,
157 const unsigned char *buf
,
161 unsigned int newpc
= pc
;
163 supply_register (regcache
, I386_EIP_REGNUM
, &newpc
);
165 for (i
= 0; i
< i386_NUM_ST_COLLECT_GREGS
; i
++)
166 if (i386_st_collect_regmap
[i
].offset
!= -1)
168 switch (i386_st_collect_regmap
[i
].size
)
171 supply_register (regcache
, i
,
173 + i386_st_collect_regmap
[i
].offset
);
178 = * (short *) (((char *) buf
)
179 + i386_st_collect_regmap
[i
].offset
);
181 supply_register (regcache
, i
, ®
);
185 internal_error (__FILE__
, __LINE__
, "unhandled register size: %d",
186 i386_st_collect_regmap
[i
].size
);
191 #endif /* HAVE_UST */
194 /* This is only needed because reg-i386-linux-lib.o references it. We
195 may use it proper at some point. */
196 const char *gdbserver_xmltarget
;
198 /* Attempt to allocate memory for trampolines in the first 64 KiB of
199 memory to enable smaller jump patches. */
202 initialize_fast_tracepoint_trampoline_buffer (void)
204 const CORE_ADDR buffer_end
= 64 * 1024;
205 /* Ensure that the buffer will be at least 1 KiB in size, which is
206 enough space for over 200 fast tracepoints. */
207 const int min_buffer_size
= 1024;
208 char buf
[IPA_BUFSIZ
];
209 CORE_ADDR mmap_min_addr
= buffer_end
+ 1;
210 ULONGEST buffer_size
;
211 FILE *f
= fopen ("/proc/sys/vm/mmap_min_addr", "r");
215 snprintf (buf
, sizeof (buf
), "mmap_min_addr open failed: %s",
217 set_trampoline_buffer_space (0, 0, buf
);
221 if (fgets (buf
, IPA_BUFSIZ
, f
))
222 sscanf (buf
, "%llu", &mmap_min_addr
);
226 buffer_size
= buffer_end
- mmap_min_addr
;
228 if (buffer_size
>= min_buffer_size
)
230 if (mmap ((void *) (uintptr_t) mmap_min_addr
, buffer_size
,
231 PROT_READ
| PROT_EXEC
| PROT_WRITE
,
232 MAP_FIXED
| MAP_PRIVATE
| MAP_ANONYMOUS
,
235 set_trampoline_buffer_space (mmap_min_addr
, buffer_end
, NULL
);
238 snprintf (buf
, IPA_BUFSIZ
, "low-64K-buffer mmap() failed: %s",
240 set_trampoline_buffer_space (0, 0, buf
);
245 snprintf (buf
, IPA_BUFSIZ
, "mmap_min_addr is %d, must be %d or less",
246 (int) mmap_min_addr
, (int) buffer_end
- min_buffer_size
);
247 set_trampoline_buffer_space (0, 0, buf
);
252 initialize_low_tracepoint (void)
254 init_registers_i386_linux ();
255 ipa_tdesc
= tdesc_i386_linux
;
256 initialize_fast_tracepoint_trampoline_buffer ();