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--- old/usr/src/uts/sun4/brand/common/brand_solaris.s
+++ new/usr/src/uts/sun4/brand/common/brand_solaris.s
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
23 23 */
24 24
25 25 /*
26 26 * This is an assembly file that gets #include-ed into the brand-specific
27 27 * assembly files (e.g. sn1_brand_asm.s) for Solaris-derived brands.
28 28 * We can't make these into functions since in the trap context there's
29 29 * no easy place to save the extra parameters that would be required, so
30 30 * each brand module needs its own copy of this code. We #include this and
31 31 * use brand-specific #defines to replace the XXX_brand_... definitions.
32 32 */
33 33
34 34 #ifdef lint
35 35
36 36 #include <sys/systm.h>
37 37
38 38 void
39 39 XXX_brand_syscall32_callback(void)
40 40 {
41 41 }
42 42
43 43 void
44 44 XXX_brand_syscall_callback(void)
45 45 {
46 46 }
47 47
48 48 #else /* !lint */
49 49
50 50 #include <sys/asm_linkage.h>
51 51 #include <sys/machthread.h>
52 52 #include <sys/privregs.h>
53 53 #include "assym.h"
54 54
55 55 #ifdef _ASM /* The remainder of this file is only for assembly files */
56 56
57 57 #if defined(sun4v)
58 58
59 59 #define GLOBALS_SWAP(reg) \
60 60 rdpr %gl, reg; \
61 61 wrpr reg, 1, %gl
62 62
63 63 /*
64 64 * The GLOBALS_RESTORE macro can only be one instruction since it's
65 65 * used in a delay slot.
66 66 */
67 67 #define GLOBALS_RESTORE(reg) \
68 68 wrpr reg, 0, %gl
69 69
70 70 #else /* !sun4v */
71 71
72 72 #define GLOBALS_SWAP(reg) \
73 73 rdpr %pstate, reg; \
74 74 wrpr reg, PSTATE_AG, %pstate
75 75
76 76 /*
77 77 * The GLOBALS_RESTORE macro can only be one instruction since it's
78 78 * used in a delay slot.
79 79 */
80 80 #define GLOBALS_RESTORE(reg) \
81 81 wrpr reg, %g0, %pstate
82 82
83 83 #endif /* !sun4v */
84 84
85 85 /*
86 86 * Input parameters:
87 87 * %g1: return point
88 88 * %g2: pointer to our cpu structure
89 89 */
90 90 ENTRY(XXX_brand_syscall32_callback)
91 91 /*
92 92 * If the trapping thread has the address mask bit clear, then it's
93 93 * a 64-bit process, and has no business calling 32-bit syscalls.
94 94 */
95 95 rdpr %tstate, %g3; /* %tstate.am is the trapping */
96 96 andcc %g3, TSTATE_AM, %g3; /* threads address mask bit */
97 97 bne,pt %xcc, _entry;
98 98 nop;
99 99 jmp %g1; /* 64 bit process, bail out */
100 100 nop;
101 101 SET_SIZE(XXX_brand_syscall32_callback)
102 102
103 103 /*
104 104 * Input parameters:
105 105 * %g1: return point
106 106 * %g2: pointer to our cpu structure
107 107 */
108 108 ENTRY(XXX_brand_syscall_callback)
109 109 /*
110 110 * If the trapping thread has the address mask bit set, then it's
111 111 * a 32-bit process, and has no business calling 64-bit syscalls.
112 112 */
113 113 rdpr %tstate, %g3; /* %tstate.am is the trapping */
114 114 andcc %g3, TSTATE_AM, %g3; /* threads address mask bit */
115 115 be,pt %xcc, _entry;
116 116 nop;
117 117 jmp %g1; /* 32 bit process, bail out */
118 118 nop;
119 119 SET_SIZE(XXX_brand_syscall_callback)
120 120
121 121 ENTRY(XXX_brand_syscall_callback_common)
122 122 _entry:
123 123 /*
124 124 * Input parameters:
125 125 * %g1: return point
126 126 * %g2: pointer to our cpu structure
127 127 *
128 128 * Note that we're free to use any %g? registers as long as
129 129 * we are are executing with alternate globals. If we're
130 130 * executing with user globals we need to backup any registers
131 131 * that we want to use so that we can restore them when we're
132 132 * done.
133 133 *
134 134 * Save some locals in the CPU tmp area to give us a little
135 135 * room to work.
136 136 */
137 137 stn %l0, [%g2 + CPU_TMP1];
138 138 stn %l1, [%g2 + CPU_TMP2];
139 139
140 140 #if defined(sun4v)
141 141 /*
142 142 * On sun4v save our input parameters (which are stored in the
143 143 * alternate globals) since we'll need to switch between alternate
144 144 * globals and normal globals, and on sun4v the alternate globals
145 145 * are not preserved across these types of switches.
146 146 */
147 147 stn %l2, [%g2 + CPU_TMP3];
148 148 stn %l3, [%g2 + CPU_TMP4];
149 149
150 150 mov %g1, %l2; /* save %g1 in %l2 */
151 151 mov %g2, %l3; /* save %g2 in %l3 */
152 152 #endif /* sun4v */
153 153
154 154 /*
155 155 * Switch from the alternate to user globals to grab the syscall
156 156 * number.
157 157 */
158 158 GLOBALS_SWAP(%l0); /* switch to normal globals */
159 159
160 160 /*
161 161 * If the system call number is >= 1024, then it is a native
162 162 * syscall that doesn't need emulation.
163 163 */
164 164 cmp %g1, 1024; /* is this a native syscall? */
165 165 bl,a _indirect_check; /* probably not, continue checking */
166 166 mov %g1, %l1; /* delay slot - grab syscall number */
167 167
168 168 /*
169 169 * This is a native syscall, probably from the emulation library.
170 170 * Subtract 1024 from the syscall number and let it go through.
171 171 */
172 172 sub %g1, 1024, %g1; /* convert magic num to real syscall */
173 173 ba _exit; /* jump back into syscall path */
174 174 GLOBALS_RESTORE(%l0); /* delay slot - */
175 175 /* switch back to alternate globals */
176 176
177 177 _indirect_check:
178 178 /*
179 179 * If the system call number is 0 (SYS_syscall), then this might be
180 180 * an indirect syscall, in which case the actual syscall number
181 181 * would be stored in %o0, in which case we need to redo the
182 182 * the whole >= 1024 check.
183 183 */
184 184 brnz,pt %g1, _emulation_check; /* is this an indirect syscall? */
185 185 nop; /* if not, goto the emulation check */
186 186
187 187 /*
188 188 * Indirect syscalls are only supported for 32 bit processes so
189 189 * consult the tstate address mask again.
190 190 */
191 191 rdpr %tstate, %l1; /* %tstate.am is the trapping */
192 192 andcc %l1, TSTATE_AM, %l1; /* threads address mask bit */
193 193 be,a,pn %xcc, _exit;
194 194 GLOBALS_RESTORE(%l0); /* delay slot - */
195 195 /* switch back to alternate globals */
196 196
197 197 /*
198 198 * The caller is 32 bit and this an indirect system call.
199 199 */
200 200 cmp %o0, 1024; /* is this a native syscall? */
201 201 bl,a _emulation_check; /* no, goto the emulation check */
202 202 mov %o0, %l1; /* delay slot - grab syscall number */
203 203
204 204 /*
205 205 * This is native indirect syscall, probably from the emulation
206 206 * library. Subtract 1024 from the syscall number and let it go
207 207 * through.
208 208 */
209 209 sub %o0, 1024, %o0; /* convert magic num to real syscall */
210 210 ba _exit; /* jump back into syscall path */
211 211 GLOBALS_RESTORE(%l0); /* delay slot - */
212 212 /* switch back to alternate globals */
213 213
214 214 _emulation_check:
215 215 GLOBALS_RESTORE(%l0); /* switch back to alternate globals */
216 216
217 217 /*
218 218 * Check to see if we want to interpose on this system call. If
219 219 * not, we jump back into the normal syscall path and pretend
220 220 * nothing happened. %l1 contains the syscall we're invoking.
221 221 */
222 222 set XXX_emulation_table, %g3;
223 223 ldn [%g3], %g3;
224 224 add %g3, %l1, %g3;
225 225 ldub [%g3], %g3;
226 226 brz %g3, _exit;
227 227 nop;
228 228
229 229 /*
230 230 * Find the address of the userspace handler.
231 231 * cpu->cpu_thread->t_procp->p_brand_data->spd_handler.
232 232 */
233 233 #if defined(sun4v)
234 234 /* restore the alternate global registers after incrementing %gl */
235 235 mov %l3, %g2;
236 236 #endif /* sun4v */
237 237 ldn [%g2 + CPU_THREAD], %g3; /* get thread ptr */
238 238 ldn [%g3 + T_PROCP], %g4; /* get proc ptr */
239 239 ldn [%g4 + __P_BRAND_DATA], %g5; /* get brand data ptr */
240 240 ldn [%g5 + SPD_HANDLER], %g5; /* get userland brnd hdlr ptr */
241 241 brz %g5, _exit; /* has it been set? */
242 242 nop;
243 243
244 244 /*
245 245 * Make sure this isn't an agent lwp. We can't do syscall
246 246 * interposition for system calls made by a agent lwp. See
247 247 * the block comments in the top of the brand emulation library
248 248 * for more information.
249 249 */
250 250 ldn [%g4 + P_AGENTTP], %g4; /* get agent thread ptr */
251 251 cmp %g3, %g4; /* is this an agent thread? */
252 252 be,pn %xcc, _exit; /* if so don't emulate */
253 253 nop;
254 254
255 255 /*
256 256 * Now the magic happens. Grab the trap return address and then
257 257 * reset it to point to the user space handler. When we execute
258 258 * the 'done' instruction, we will jump into our handler instead of
259 259 * the user's code. We also stick the old return address in %g5,
260 260 * so we can return to the proper instruction in the user's code.
261 261 * Note: we also pass back the base address of the syscall
262 262 * emulation table. This is a performance hack to avoid having to
263 263 * look it up on every call.
264 264 */
265 265 rdpr %tnpc, %l1; /* save old tnpc */
266 266 wrpr %g0, %g5, %tnpc; /* setup tnpc */
267 267 GLOBALS_SWAP(%l0); /* switch to normal globals */
268 268 mov %l1, %g5; /* pass tnpc to user code in %g5 */
269 269 GLOBALS_RESTORE(%l0); /* switch back to alternate globals */
270 270
271 271 /* Update the address we're going to return to */
272 272 #if defined(sun4v)
273 273 set fast_trap_done_chk_intr, %l2;
274 274 #else /* !sun4v */
275 275 set fast_trap_done_chk_intr, %g1;
276 276 #endif /* !sun4v */
277 277
278 278 _exit:
279 279 /*
280 280 * Restore registers before returning.
281 281 *
282 282 * Note that %g2 should be loaded with the CPU struct addr and
283 283 * %g1 should be loaded the address we're going to return to.
284 284 */
285 285 #if defined(sun4v)
286 286 /* restore the alternate global registers after incrementing %gl */
287 287 mov %l2, %g1; /* restore %g1 from %l2 */
288 288 mov %l3, %g2; /* restore %g2 from %l3 */
289 289
290 290 ldn [%g2 + CPU_TMP4], %l3; /* restore locals */
291 291 ldn [%g2 + CPU_TMP3], %l2;
292 292 #endif /* sun4v */
293 293
294 294 ldn [%g2 + CPU_TMP2], %l1; /* restore locals */
295 295 ldn [%g2 + CPU_TMP1], %l0;
296 296
297 297 jmp %g1;
298 298 nop;
299 299 SET_SIZE(XXX_brand_syscall_callback_common)
300 300
301 301 #endif /* _ASM */
302 302 #endif /* !lint */
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