4 // Copyright (c) 1999, 2000
6 // All rights reserved.
8 // Redistribution and use in source and binary forms, with or without
9 // modification, are permitted provided that the following conditions
12 // 1. Redistributions of source code must retain the above copyright
13 // notice, this list of conditions and the following disclaimer.
15 // 2. Redistributions in binary form must reproduce the above copyright
16 // notice, this list of conditions and the following disclaimer in the
17 // documentation and/or other materials provided with the distribution.
19 // 3. All advertising materials mentioning features or use of this software
20 // must display the following acknowledgement:
22 // This product includes software developed by Intel Corporation and
25 // 4. Neither the name of Intel Corporation or its contributors may be
26 // used to endorse or promote products derived from this software
27 // without specific prior written permission.
29 // THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION AND CONTRIBUTORS ``AS IS''
30 // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 // ARE DISCLAIMED. IN NO EVENT SHALL INTEL CORPORATION OR CONTRIBUTORS BE
33 // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
34 // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
35 // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
36 // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
37 // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
38 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
39 // THE POSSIBILITY OF SUCH DAMAGE.
50 // Contains an implementation of setjmp and longjmp for the
51 // IA-64 architecture.
55 #include <machine/asm.h>
56 #include <machine/setjmp.h>
58 // int setjmp(struct jmp_buffer *)
60 // Setup a non-local goto.
64 // SetJump stores the current register set in the area pointed to
65 // by "save". It returns zero. Subsequent calls to "LongJump" will
66 // restore the registers and return non-zero to the same location.
68 // On entry, r32 contains the pointer to the jmp_buffer
73 // Make sure buffer is aligned at 16byte boundary
75 add r10 = -0x10,r0 ;; // mask the lower 4 bits
77 add r32 = 0x10, r32;; // move to next 16 byte boundary
79 add r10 = J_PREDS, r32 // skip Unats & pfs save area
82 // save immediate context
84 mov r2 = ar.bsp // save backing store pointer
85 mov r3 = pr // save predicates
89 // save user Unat register
91 mov r16 = ar.lc // save loop count register
92 mov r14 = ar.unat // save user Unat register
94 st8 [r10] = r3, J_LC-J_PREDS
95 st8 [r11] = r2, J_R4-J_BSP
97 st8 [r10] = r16, J_R5-J_LC
98 st8 [r32] = r14, J_NATS // Note: Unat at the
99 // beginning of the save area
103 // save preserved general registers & NaT's
105 st8.spill [r11] = r4, J_R6-J_R4
107 st8.spill [r10] = r5, J_R7-J_R5
109 st8.spill [r11] = r6, J_SP-J_R6
111 st8.spill [r10] = r7, J_F3-J_R7
113 st8.spill [r11] = sp, J_F2-J_SP
116 // save spilled Unat and pfs registers
118 mov r2 = ar.unat // save Unat register after spill
120 st8 [r32] = r2, J_PFS-J_NATS // save unat for spilled regs
122 st8 [r32] = r15 // save pfs
124 // save floating registers
126 stf.spill [r11] = f2, J_F4-J_F2
127 stf.spill [r10] = f3, J_F5-J_F3
129 stf.spill [r11] = f4, J_F16-J_F4
130 stf.spill [r10] = f5, J_F17-J_F5
132 stf.spill [r11] = f16, J_F18-J_F16
133 stf.spill [r10] = f17, J_F19-J_F17
135 stf.spill [r11] = f18, J_F20-J_F18
136 stf.spill [r10] = f19, J_F21-J_F19
138 stf.spill [r11] = f20, J_F22-J_F20
139 stf.spill [r10] = f21, J_F23-J_F21
141 stf.spill [r11] = f22, J_F24-J_F22
142 stf.spill [r10] = f23, J_F25-J_F23
144 stf.spill [r11] = f24, J_F26-J_F24
145 stf.spill [r10] = f25, J_F27-J_F25
147 stf.spill [r11] = f26, J_F28-J_F26
148 stf.spill [r10] = f27, J_F29-J_F27
150 stf.spill [r11] = f28, J_F30-J_F28
151 stf.spill [r10] = f29, J_F31-J_F29
153 stf.spill [r11] = f30, J_FPSR-J_F30
154 stf.spill [r10] = f31, J_B0-J_F31 // size of f31 + fpsr
156 // save FPSR register & branch registers
158 mov r2 = ar.fpsr // save fpsr register
161 st8 [r11] = r2, J_B1-J_FPSR
162 st8 [r10] = r3, J_B2-J_B0
166 st8 [r11] = r2, J_B3-J_B1
167 st8 [r10] = r3, J_B4-J_B2
171 st8 [r11] = r2, J_B5-J_B3
180 mov r8 = r0 // return 0 from setjmp
181 mov ar.unat = r14 // restore unat
188 // void longjmp(struct jmp_buffer *, int val)
190 // Perform a non-local goto.
194 // LongJump initializes the register set to the values saved by a
195 // previous 'SetJump' and jumps to the return location saved by that
196 // 'SetJump'. This has the effect of unwinding the stack and returning
197 // for a second time to the 'SetJump'.
202 // Make sure buffer is aligned at 16byte boundary
204 add r10 = -0x10,r0 ;; // mask the lower 4 bits
206 add r32 = 0x10, r32;; // move to next 16 byte boundary
209 // caching the return value as we do invala in the end
211 mov r8 = r33 // return value
214 // get immediate context
216 mov r14 = ar.rsc // get user RSC conf
217 add r10 = J_PFS, r32 // get address of pfs
218 add r11 = J_NATS, r32
220 ld8 r15 = [r10], J_BSP-J_PFS // get pfs
221 ld8 r2 = [r11], J_LC-J_NATS // get unat for spilled regs
225 ld8 r16 = [r10], J_PREDS-J_BSP // get backing store pointer
226 mov ar.rsc = r0 // put RSE in enforced lazy
231 // while returning from longjmp the BSPSTORE and BSP needs to be
232 // same and discard all the registers allocated after we did
233 // setjmp. Also, we need to generate the RNAT register since we
234 // did not flushed the RSE on setjmp.
236 mov r17 = ar.bspstore // get current BSPSTORE
238 cmp.ltu p6,p7 = r17, r16 // is it less than BSP of
239 (p6) br.spnt.few .flush_rse
240 mov r19 = ar.rnat // get current RNAT
242 loadrs // invalidate dirty regs
243 br.sptk.many .restore_rnat // restore RNAT
248 mov r19 = ar.rnat // get current RNAT
249 mov r17 = r16 // current BSPSTORE
253 // check if RNAT is saved between saved BSP and curr BSPSTORE
257 dep r18 = r18,r16,3,6 // get RNAT address
259 cmp.ltu p8,p9 = r18, r17 // RNAT saved on RSE
261 (p8) ld8 r19 = [r18] // get RNAT from RSE
263 mov ar.bspstore = r16 // set new BSPSTORE
265 mov ar.rnat = r19 // restore RNAT
266 mov ar.rsc = r14 // restore RSC conf
269 ld8 r3 = [r11], J_R4-J_LC // get lc register
270 ld8 r2 = [r10], J_R5-J_PREDS // get predicates
275 // restore preserved general registers & NaT's
277 ld8.fill r4 = [r11], J_R6-J_R4
279 ld8.fill r5 = [r10], J_R7-J_R5
280 ld8.fill r6 = [r11], J_SP-J_R6
282 ld8.fill r7 = [r10], J_F2-J_R7
283 ld8.fill sp = [r11], J_F3-J_SP
286 // restore floating registers
288 ldf.fill f2 = [r10], J_F4-J_F2
289 ldf.fill f3 = [r11], J_F5-J_F3
291 ldf.fill f4 = [r10], J_F16-J_F4
292 ldf.fill f5 = [r11], J_F17-J_F5
294 ldf.fill f16 = [r10], J_F18-J_F16
295 ldf.fill f17 = [r11], J_F19-J_F17
297 ldf.fill f18 = [r10], J_F20-J_F18
298 ldf.fill f19 = [r11], J_F21-J_F19
300 ldf.fill f20 = [r10], J_F22-J_F20
301 ldf.fill f21 = [r11], J_F23-J_F21
303 ldf.fill f22 = [r10], J_F24-J_F22
304 ldf.fill f23 = [r11], J_F25-J_F23
306 ldf.fill f24 = [r10], J_F26-J_F24
307 ldf.fill f25 = [r11], J_F27-J_F25
309 ldf.fill f26 = [r10], J_F28-J_F26
310 ldf.fill f27 = [r11], J_F29-J_F27
312 ldf.fill f28 = [r10], J_F30-J_F28
313 ldf.fill f29 = [r11], J_F31-J_F29
315 ldf.fill f30 = [r10], J_FPSR-J_F30
316 ldf.fill f31 = [r11], J_B0-J_F31 ;;
319 // restore branch registers and fpsr
321 ld8 r16 = [r10], J_B1-J_FPSR // get fpsr
322 ld8 r17 = [r11], J_B2-J_B0 // get return pointer
326 ld8 r2 = [r10], J_B3-J_B1
327 ld8 r3 = [r11], J_B4-J_B2
331 ld8 r2 = [r10], J_B5-J_B3
337 ld8 r21 = [r32] // get user unat