[binutils.git] / gdb / gdbserver / lynx-i386-low.c

/* Copyright (C) 2010, 2011 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 "lynx-low.h"

#include <stdint.h>
#include <limits.h>
#include <sys/ptrace.h>

/* The following two typedefs are defined in a .h file which is not
   in the standard include path (/sys/include/family/x86/ucontext.h),
   so we just duplicate them here.  */

/* General register context */
typedef struct usr_econtext {

    uint32_t    uec_fault;
    uint32_t    uec_es;
    uint32_t    uec_ds;
    uint32_t    uec_edi;
    uint32_t    uec_esi;
    uint32_t    uec_ebp;
    uint32_t    uec_temp;
    uint32_t    uec_ebx;
    uint32_t    uec_edx;
    uint32_t    uec_ecx;
    uint32_t    uec_eax;
    uint32_t    uec_inum;
    uint32_t    uec_ecode;
    uint32_t    uec_eip;
    uint32_t    uec_cs;
    uint32_t    uec_eflags;
    uint32_t    uec_esp;
    uint32_t    uec_ss;
    uint32_t    uec_fs;
    uint32_t    uec_gs;
} usr_econtext_t;

/* Floating point and SIMD register context */
typedef struct usr_fcontext {
        uint16_t         ufc_control;
        uint16_t         ufc_status;
        uint16_t         ufc_tag;
        uint16_t         ufc_opcode;
        uint8_t         *ufc_inst_off;
        uint32_t         ufc_inst_sel;
        uint8_t         *ufc_data_off;
        uint32_t         ufc_data_sel;
        uint32_t         usse_mxcsr;
        uint32_t         usse_mxcsr_mask;
        struct ufp387_real {
                uint16_t umant4;
                uint16_t umant3;
                uint16_t umant2;
                uint16_t umant1;
                uint16_t us_and_e;
                uint16_t ureserved_1;
                uint16_t ureserved_2;
                uint16_t ureserved_3;
        } ufc_reg[8];
        struct uxmm_register {
                uint16_t uchunk_1;
                uint16_t uchunk_2;
                uint16_t uchunk_3;
                uint16_t uchunk_4;
                uint16_t uchunk_5;
                uint16_t uchunk_6;
                uint16_t uchunk_7;
                uint16_t uchunk_8;
        } uxmm_reg[8];
        char ureserved[16][14];
} usr_fcontext_t;

/* The index of various registers inside the regcache.  */

enum lynx_i386_gdb_regnum
{
  I386_EAX_REGNUM,
  I386_ECX_REGNUM,
  I386_EDX_REGNUM,
  I386_EBX_REGNUM,
  I386_ESP_REGNUM,
  I386_EBP_REGNUM,
  I386_ESI_REGNUM,
  I386_EDI_REGNUM,
  I386_EIP_REGNUM,
  I386_EFLAGS_REGNUM,
  I386_CS_REGNUM,
  I386_SS_REGNUM,
  I386_DS_REGNUM,
  I386_ES_REGNUM,
  I386_FS_REGNUM,
  I386_GS_REGNUM,
  I386_ST0_REGNUM,
  I386_FCTRL_REGNUM = I386_ST0_REGNUM + 8,
  I386_FSTAT_REGNUM,
  I386_FTAG_REGNUM,
  I386_FISEG_REGNUM,
  I386_FIOFF_REGNUM,
  I386_FOSEG_REGNUM,
  I386_FOOFF_REGNUM,
  I386_FOP_REGNUM,
  I386_XMM0_REGNUM = 32,
  I386_MXCSR_REGNUM = I386_XMM0_REGNUM + 8,
  I386_SENTINEL_REGUM
};

/* Defined in auto-generated file i386.c.  */
extern void init_registers_i386 (void);

/* The fill_function for the general-purpose register set.  */

static void
lynx_i386_fill_gregset (struct regcache *regcache, char *buf)
{
#define lynx_i386_collect_gp(regnum, fld) \
  collect_register (regcache, regnum, \
                    buf + offsetof (usr_econtext_t, uec_##fld))

  lynx_i386_collect_gp (I386_EAX_REGNUM, eax);
  lynx_i386_collect_gp (I386_ECX_REGNUM, ecx);
  lynx_i386_collect_gp (I386_EDX_REGNUM, edx);
  lynx_i386_collect_gp (I386_EBX_REGNUM, ebx);
  lynx_i386_collect_gp (I386_ESP_REGNUM, esp);
  lynx_i386_collect_gp (I386_EBP_REGNUM, ebp);
  lynx_i386_collect_gp (I386_ESI_REGNUM, esi);
  lynx_i386_collect_gp (I386_EDI_REGNUM, edi);
  lynx_i386_collect_gp (I386_EIP_REGNUM, eip);
  lynx_i386_collect_gp (I386_EFLAGS_REGNUM, eflags);
  lynx_i386_collect_gp (I386_CS_REGNUM, cs);
  lynx_i386_collect_gp (I386_SS_REGNUM, ss);
  lynx_i386_collect_gp (I386_DS_REGNUM, ds);
  lynx_i386_collect_gp (I386_ES_REGNUM, es);
  lynx_i386_collect_gp (I386_FS_REGNUM, fs);
  lynx_i386_collect_gp (I386_GS_REGNUM, gs);
}

/* The store_function for the general-purpose register set.  */

static void
lynx_i386_store_gregset (struct regcache *regcache, const char *buf)
{
#define lynx_i386_supply_gp(regnum, fld) \
  supply_register (regcache, regnum, \
                   buf + offsetof (usr_econtext_t, uec_##fld))

  lynx_i386_supply_gp (I386_EAX_REGNUM, eax);
  lynx_i386_supply_gp (I386_ECX_REGNUM, ecx);
  lynx_i386_supply_gp (I386_EDX_REGNUM, edx);
  lynx_i386_supply_gp (I386_EBX_REGNUM, ebx);
  lynx_i386_supply_gp (I386_ESP_REGNUM, esp);
  lynx_i386_supply_gp (I386_EBP_REGNUM, ebp);
  lynx_i386_supply_gp (I386_ESI_REGNUM, esi);
  lynx_i386_supply_gp (I386_EDI_REGNUM, edi);
  lynx_i386_supply_gp (I386_EIP_REGNUM, eip);
  lynx_i386_supply_gp (I386_EFLAGS_REGNUM, eflags);
  lynx_i386_supply_gp (I386_CS_REGNUM, cs);
  lynx_i386_supply_gp (I386_SS_REGNUM, ss);
  lynx_i386_supply_gp (I386_DS_REGNUM, ds);
  lynx_i386_supply_gp (I386_ES_REGNUM, es);
  lynx_i386_supply_gp (I386_FS_REGNUM, fs);
  lynx_i386_supply_gp (I386_GS_REGNUM, gs);
}

/* Extract the first 16 bits of register REGNUM in the REGCACHE,
   and store these 2 bytes at DEST.

   This is useful to collect certain 16bit registers which are known
   by GDBserver as 32bit registers (such as the Control Register
   for instance).  */

static void
collect_16bit_register (struct regcache *regcache, int regnum, char *dest)
{
  gdb_byte word[4];

  collect_register (regcache, regnum, word);
  memcpy (dest, word, 2);
}

/* The fill_function for the floating-point register set.  */

static void
lynx_i386_fill_fpregset (struct regcache *regcache, char *buf)
{
  int i;

  /* Collect %st0 .. %st7.  */
  for (i = 0; i < 8; i++)
    collect_register (regcache, I386_ST0_REGNUM + i,
                      buf + offsetof (usr_fcontext_t, ufc_reg)
		      + i * sizeof (struct ufp387_real));

  /* Collect the other FPU registers.  */
  collect_16bit_register (regcache, I386_FCTRL_REGNUM,
                          buf + offsetof (usr_fcontext_t, ufc_control));
  collect_16bit_register (regcache, I386_FSTAT_REGNUM,
                          buf + offsetof (usr_fcontext_t, ufc_status));
  collect_16bit_register (regcache, I386_FTAG_REGNUM,
                          buf + offsetof (usr_fcontext_t, ufc_tag));
  collect_register (regcache, I386_FISEG_REGNUM,
                    buf + offsetof (usr_fcontext_t, ufc_inst_sel));
  collect_register (regcache, I386_FIOFF_REGNUM,
                    buf + offsetof (usr_fcontext_t, ufc_inst_off));
  collect_register (regcache, I386_FOSEG_REGNUM,
                    buf + offsetof (usr_fcontext_t, ufc_data_sel));
  collect_register (regcache, I386_FOOFF_REGNUM,
                    buf + offsetof (usr_fcontext_t, ufc_data_off));
  collect_16bit_register (regcache, I386_FOP_REGNUM,
                          buf + offsetof (usr_fcontext_t, ufc_opcode));

  /* Collect the XMM registers.  */
  for (i = 0; i < 8; i++)
    collect_register (regcache, I386_XMM0_REGNUM + i,
                      buf + offsetof (usr_fcontext_t, uxmm_reg)
		      + i * sizeof (struct uxmm_register));
  collect_register (regcache, I386_MXCSR_REGNUM,
                    buf + offsetof (usr_fcontext_t, usse_mxcsr));
}

/* This is the supply counterpart for collect_16bit_register:
   It extracts a 2byte value from BUF, and uses that value to
   set REGNUM's value in the regcache.

   This is useful to supply the value of certain 16bit registers
   which are known by GDBserver as 32bit registers (such as the Control
   Register for instance).  */

static void
supply_16bit_register (struct regcache *regcache, int regnum, const char *buf)
{
  gdb_byte word[4];

  memcpy (word, buf, 2);
  memset (word + 2, 0, 2);
  supply_register (regcache, regnum, word);
}

/* The store_function for the floating-point register set.  */

static void
lynx_i386_store_fpregset (struct regcache *regcache, const char *buf)
{
  int i;

  /* Store the %st0 .. %st7 registers.  */
  for (i = 0; i < 8; i++)
    supply_register (regcache, I386_ST0_REGNUM + i,
                     buf + offsetof (usr_fcontext_t, ufc_reg)
		     + i * sizeof (struct ufp387_real));

  /* Store the other FPU registers.  */
  supply_16bit_register (regcache, I386_FCTRL_REGNUM,
                         buf + offsetof (usr_fcontext_t, ufc_control));
  supply_16bit_register (regcache, I386_FSTAT_REGNUM,
                         buf + offsetof (usr_fcontext_t, ufc_status));
  supply_16bit_register (regcache, I386_FTAG_REGNUM,
                         buf + offsetof (usr_fcontext_t, ufc_tag));
  supply_register (regcache, I386_FISEG_REGNUM,
                   buf + offsetof (usr_fcontext_t, ufc_inst_sel));
  supply_register (regcache, I386_FIOFF_REGNUM,
                   buf + offsetof (usr_fcontext_t, ufc_inst_off));
  supply_register (regcache, I386_FOSEG_REGNUM,
                   buf + offsetof (usr_fcontext_t, ufc_data_sel));
  supply_register (regcache, I386_FOOFF_REGNUM,
                   buf + offsetof (usr_fcontext_t, ufc_data_off));
  supply_16bit_register (regcache, I386_FOP_REGNUM,
                         buf + offsetof (usr_fcontext_t, ufc_opcode));

  /* Store the XMM registers.  */
  for (i = 0; i < 8; i++)
    supply_register (regcache, I386_XMM0_REGNUM + i,
                     buf + offsetof (usr_fcontext_t, uxmm_reg)
		     + i * sizeof (struct uxmm_register));
  supply_register (regcache, I386_MXCSR_REGNUM,
                   buf + offsetof (usr_fcontext_t, usse_mxcsr));
}

/* Implements the lynx_target_ops.arch_setup routine.  */

static void
lynx_i386_arch_setup (void)
{
  init_registers_i386 ();
}

/* Description of all the x86-lynx register sets.  */

struct lynx_regset_info lynx_target_regsets[] = {
  /* General Purpose Registers.  */
  {PTRACE_GETREGS, PTRACE_SETREGS, sizeof(usr_econtext_t),
   lynx_i386_fill_gregset, lynx_i386_store_gregset},
  /* Floating Point Registers.  */
  { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof(usr_fcontext_t),
    lynx_i386_fill_fpregset, lynx_i386_store_fpregset },
  /* End of list marker.  */
  {0, 0, -1, NULL, NULL }
};

/* The lynx_target_ops vector for x86-lynx.  */

struct lynx_target_ops the_low_target = {
  lynx_i386_arch_setup,
};
Commit	Line	Data
7b6bb8da	1	/* Copyright (C) 2010, 2011 Free Software Foundation, Inc.
fa1bd1e4 JB	2
	3	This file is part of GDB.
	4
	5	This program is free software; you can redistribute it and/or modify
	6	it under the terms of the GNU General Public License as published by
	7	the Free Software Foundation; either version 3 of the License, or
	8	(at your option) any later version.
	9
	10	This program is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	GNU General Public License for more details.
	14
	15	You should have received a copy of the GNU General Public License
	16	along with this program. If not, see <http://www.gnu.org/licenses/>. */
	17
	18	#include "server.h"
	19	#include "lynx-low.h"
	20
	21	#include <stdint.h>
	22	#include <limits.h>
	23	#include <sys/ptrace.h>
	24
	25	/* The following two typedefs are defined in a .h file which is not
	26	in the standard include path (/sys/include/family/x86/ucontext.h),
	27	so we just duplicate them here. */
	28
	29	/* General register context */
	30	typedef struct usr_econtext {
	31
	32	uint32_t uec_fault;
	33	uint32_t uec_es;
	34	uint32_t uec_ds;
	35	uint32_t uec_edi;
	36	uint32_t uec_esi;
	37	uint32_t uec_ebp;
	38	uint32_t uec_temp;
	39	uint32_t uec_ebx;
	40	uint32_t uec_edx;
	41	uint32_t uec_ecx;
	42	uint32_t uec_eax;
	43	uint32_t uec_inum;
	44	uint32_t uec_ecode;
	45	uint32_t uec_eip;
	46	uint32_t uec_cs;
	47	uint32_t uec_eflags;
	48	uint32_t uec_esp;
	49	uint32_t uec_ss;
	50	uint32_t uec_fs;
	51	uint32_t uec_gs;
	52	} usr_econtext_t;
	53
	54	/* Floating point and SIMD register context */
	55	typedef struct usr_fcontext {
	56	uint16_t ufc_control;
	57	uint16_t ufc_status;
	58	uint16_t ufc_tag;
	59	uint16_t ufc_opcode;
	60	uint8_t *ufc_inst_off;
	61	uint32_t ufc_inst_sel;
	62	uint8_t *ufc_data_off;
	63	uint32_t ufc_data_sel;
	64	uint32_t usse_mxcsr;
	65	uint32_t usse_mxcsr_mask;
66	struct ufp387_real {
67	uint16_t umant4;
68	uint16_t umant3;
69	uint16_t umant2;
70	uint16_t umant1;
71	uint16_t us_and_e;
72	uint16_t ureserved_1;
73	uint16_t ureserved_2;
74	uint16_t ureserved_3;
75	} ufc_reg[8];
76	struct uxmm_register {
77	uint16_t uchunk_1;
78	uint16_t uchunk_2;
79	uint16_t uchunk_3;
80	uint16_t uchunk_4;
81	uint16_t uchunk_5;
82	uint16_t uchunk_6;
83	uint16_t uchunk_7;
84	uint16_t uchunk_8;
85	} uxmm_reg[8];
86	char ureserved[16][14];
87	} usr_fcontext_t;
88
89	/* The index of various registers inside the regcache. */
90
91	enum lynx_i386_gdb_regnum
92	{
93	I386_EAX_REGNUM,
94	I386_ECX_REGNUM,
95	I386_EDX_REGNUM,
96	I386_EBX_REGNUM,
97	I386_ESP_REGNUM,
98	I386_EBP_REGNUM,
99	I386_ESI_REGNUM,
100	I386_EDI_REGNUM,
101	I386_EIP_REGNUM,
102	I386_EFLAGS_REGNUM,
103	I386_CS_REGNUM,
104	I386_SS_REGNUM,
105	I386_DS_REGNUM,
106	I386_ES_REGNUM,
107	I386_FS_REGNUM,
108	I386_GS_REGNUM,
109	I386_ST0_REGNUM,
110	I386_FCTRL_REGNUM = I386_ST0_REGNUM + 8,
111	I386_FSTAT_REGNUM,
112	I386_FTAG_REGNUM,
113	I386_FISEG_REGNUM,
114	I386_FIOFF_REGNUM,
115	I386_FOSEG_REGNUM,
116	I386_FOOFF_REGNUM,
117	I386_FOP_REGNUM,
118	I386_XMM0_REGNUM = 32,
119	I386_MXCSR_REGNUM = I386_XMM0_REGNUM + 8,
120	I386_SENTINEL_REGUM
121	};
122
123	/* Defined in auto-generated file i386.c. */
124	extern void init_registers_i386 (void);
125
126	/* The fill_function for the general-purpose register set. */
127
128	static void
129	lynx_i386_fill_gregset (struct regcache regcache, char buf)
130	{
131	#define lynx_i386_collect_gp(regnum, fld) \
132	collect_register (regcache, regnum, \
133	buf + offsetof (usr_econtext_t, uec_##fld))
134
135	lynx_i386_collect_gp (I386_EAX_REGNUM, eax);
136	lynx_i386_collect_gp (I386_ECX_REGNUM, ecx);
137	lynx_i386_collect_gp (I386_EDX_REGNUM, edx);
138	lynx_i386_collect_gp (I386_EBX_REGNUM, ebx);
139	lynx_i386_collect_gp (I386_ESP_REGNUM, esp);
140	lynx_i386_collect_gp (I386_EBP_REGNUM, ebp);
141	lynx_i386_collect_gp (I386_ESI_REGNUM, esi);
142	lynx_i386_collect_gp (I386_EDI_REGNUM, edi);
143	lynx_i386_collect_gp (I386_EIP_REGNUM, eip);
144	lynx_i386_collect_gp (I386_EFLAGS_REGNUM, eflags);
145	lynx_i386_collect_gp (I386_CS_REGNUM, cs);
146	lynx_i386_collect_gp (I386_SS_REGNUM, ss);
147	lynx_i386_collect_gp (I386_DS_REGNUM, ds);
148	lynx_i386_collect_gp (I386_ES_REGNUM, es);
149	lynx_i386_collect_gp (I386_FS_REGNUM, fs);
150	lynx_i386_collect_gp (I386_GS_REGNUM, gs);
151	}
152
153	/* The store_function for the general-purpose register set. */
154
155	static void
156	lynx_i386_store_gregset (struct regcache regcache, const char buf)
157	{
158	#define lynx_i386_supply_gp(regnum, fld) \
159	supply_register (regcache, regnum, \
160	buf + offsetof (usr_econtext_t, uec_##fld))
161
162	lynx_i386_supply_gp (I386_EAX_REGNUM, eax);
163	lynx_i386_supply_gp (I386_ECX_REGNUM, ecx);
164	lynx_i386_supply_gp (I386_EDX_REGNUM, edx);
165	lynx_i386_supply_gp (I386_EBX_REGNUM, ebx);
166	lynx_i386_supply_gp (I386_ESP_REGNUM, esp);
167	lynx_i386_supply_gp (I386_EBP_REGNUM, ebp);
168	lynx_i386_supply_gp (I386_ESI_REGNUM, esi);
169	lynx_i386_supply_gp (I386_EDI_REGNUM, edi);
170	lynx_i386_supply_gp (I386_EIP_REGNUM, eip);
171	lynx_i386_supply_gp (I386_EFLAGS_REGNUM, eflags);
172	lynx_i386_supply_gp (I386_CS_REGNUM, cs);
173	lynx_i386_supply_gp (I386_SS_REGNUM, ss);
174	lynx_i386_supply_gp (I386_DS_REGNUM, ds);
175	lynx_i386_supply_gp (I386_ES_REGNUM, es);
176	lynx_i386_supply_gp (I386_FS_REGNUM, fs);
177	lynx_i386_supply_gp (I386_GS_REGNUM, gs);
178	}
179
180	/* Extract the first 16 bits of register REGNUM in the REGCACHE,
181	and store these 2 bytes at DEST.
182
183	This is useful to collect certain 16bit registers which are known
184	by GDBserver as 32bit registers (such as the Control Register
185	for instance). */
186
187	static void
188	collect_16bit_register (struct regcache regcache, int regnum, char dest)
189	{
190	gdb_byte word[4];
191
192	collect_register (regcache, regnum, word);
193	memcpy (dest, word, 2);
194	}
195
196	/* The fill_function for the floating-point register set. */
197
198	static void
199	lynx_i386_fill_fpregset (struct regcache regcache, char buf)
200	{
201	int i;
202
203	/* Collect %st0 .. %st7. */
204	for (i = 0; i < 8; i++)
205	collect_register (regcache, I386_ST0_REGNUM + i,
206	buf + offsetof (usr_fcontext_t, ufc_reg)
207	+ i * sizeof (struct ufp387_real));
208
209	/* Collect the other FPU registers. */
210	collect_16bit_register (regcache, I386_FCTRL_REGNUM,
211	buf + offsetof (usr_fcontext_t, ufc_control));
212	collect_16bit_register (regcache, I386_FSTAT_REGNUM,
213	buf + offsetof (usr_fcontext_t, ufc_status));
214	collect_16bit_register (regcache, I386_FTAG_REGNUM,
215	buf + offsetof (usr_fcontext_t, ufc_tag));
216	collect_register (regcache, I386_FISEG_REGNUM,
217	buf + offsetof (usr_fcontext_t, ufc_inst_sel));
218	collect_register (regcache, I386_FIOFF_REGNUM,
219	buf + offsetof (usr_fcontext_t, ufc_inst_off));
220	collect_register (regcache, I386_FOSEG_REGNUM,
221	buf + offsetof (usr_fcontext_t, ufc_data_sel));
222	collect_register (regcache, I386_FOOFF_REGNUM,
223	buf + offsetof (usr_fcontext_t, ufc_data_off));
224	collect_16bit_register (regcache, I386_FOP_REGNUM,
225	buf + offsetof (usr_fcontext_t, ufc_opcode));
226
227	/* Collect the XMM registers. */
228	for (i = 0; i < 8; i++)
229	collect_register (regcache, I386_XMM0_REGNUM + i,
230	buf + offsetof (usr_fcontext_t, uxmm_reg)
231	+ i * sizeof (struct uxmm_register));
232	collect_register (regcache, I386_MXCSR_REGNUM,
233	buf + offsetof (usr_fcontext_t, usse_mxcsr));
234	}
235
236	/* This is the supply counterpart for collect_16bit_register:
237	It extracts a 2byte value from BUF, and uses that value to
238	set REGNUM's value in the regcache.
239
240	This is useful to supply the value of certain 16bit registers
241	which are known by GDBserver as 32bit registers (such as the Control
242	Register for instance). */
243
244	static void
245	supply_16bit_register (struct regcache regcache, int regnum, const char buf)
246	{
247	gdb_byte word[4];
248
249	memcpy (word, buf, 2);
250	memset (word + 2, 0, 2);
251	supply_register (regcache, regnum, word);
252	}
253
254	/* The store_function for the floating-point register set. */
255
256	static void
257	lynx_i386_store_fpregset (struct regcache regcache, const char buf)
258	{
259	int i;
260
261	/* Store the %st0 .. %st7 registers. */
262	for (i = 0; i < 8; i++)
263	supply_register (regcache, I386_ST0_REGNUM + i,
264	buf + offsetof (usr_fcontext_t, ufc_reg)
265	+ i * sizeof (struct ufp387_real));
266
267	/* Store the other FPU registers. */
268	supply_16bit_register (regcache, I386_FCTRL_REGNUM,
269	buf + offsetof (usr_fcontext_t, ufc_control));
270	supply_16bit_register (regcache, I386_FSTAT_REGNUM,
271	buf + offsetof (usr_fcontext_t, ufc_status));
272	supply_16bit_register (regcache, I386_FTAG_REGNUM,
273	buf + offsetof (usr_fcontext_t, ufc_tag));
274	supply_register (regcache, I386_FISEG_REGNUM,
275	buf + offsetof (usr_fcontext_t, ufc_inst_sel));
276	supply_register (regcache, I386_FIOFF_REGNUM,
277	buf + offsetof (usr_fcontext_t, ufc_inst_off));
278	supply_register (regcache, I386_FOSEG_REGNUM,
279	buf + offsetof (usr_fcontext_t, ufc_data_sel));
280	supply_register (regcache, I386_FOOFF_REGNUM,
281	buf + offsetof (usr_fcontext_t, ufc_data_off));
282	supply_16bit_register (regcache, I386_FOP_REGNUM,
283	buf + offsetof (usr_fcontext_t, ufc_opcode));
284
285	/* Store the XMM registers. */
286	for (i = 0; i < 8; i++)
287	supply_register (regcache, I386_XMM0_REGNUM + i,
288	buf + offsetof (usr_fcontext_t, uxmm_reg)
289	+ i * sizeof (struct uxmm_register));
290	supply_register (regcache, I386_MXCSR_REGNUM,
291	buf + offsetof (usr_fcontext_t, usse_mxcsr));
292	}
293
294	/* Implements the lynx_target_ops.arch_setup routine. */
295
296	static void
297	lynx_i386_arch_setup (void)
298	{
299	init_registers_i386 ();
300	}
301
302	/* Description of all the x86-lynx register sets. */
303
304	struct lynx_regset_info lynx_target_regsets[] = {
305	/* General Purpose Registers. */
306	{PTRACE_GETREGS, PTRACE_SETREGS, sizeof(usr_econtext_t),
307	lynx_i386_fill_gregset, lynx_i386_store_gregset},
308	/* Floating Point Registers. */
309	{ PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof(usr_fcontext_t),
310	lynx_i386_fill_fpregset, lynx_i386_store_fpregset },
311	/* End of list marker. */
312	{0, 0, -1, NULL, NULL }
313	};
314
315	/* The lynx_target_ops vector for x86-lynx. */
316
317	struct lynx_target_ops the_low_target = {
318	lynx_i386_arch_setup,
319	};